1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 /* SPDX-License-Identifier: GPL-2.0 */ #undef TRACE_SYSTEM #define TRACE_SYSTEM block #if !defined(_TRACE_BLOCK_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_BLOCK_H #include <linux/blktrace_api.h> #include <linux/blkdev.h> #include <linux/buffer_head.h> #include <linux/tracepoint.h> #define RWBS_LEN 8 DECLARE_EVENT_CLASS(block_buffer, TP_PROTO(struct buffer_head *bh), TP_ARGS(bh), TP_STRUCT__entry ( __field( dev_t, dev ) __field( sector_t, sector ) __field( size_t, size ) ), TP_fast_assign( __entry->dev = bh->b_bdev->bd_dev; __entry->sector = bh->b_blocknr; __entry->size = bh->b_size; ), TP_printk("%d,%d sector=%llu size=%zu", MAJOR(__entry->dev), MINOR(__entry->dev), (unsigned long long)__entry->sector, __entry->size ) ); /** * block_touch_buffer - mark a buffer accessed * @bh: buffer_head being touched * * Called from touch_buffer(). */ DEFINE_EVENT(block_buffer, block_touch_buffer, TP_PROTO(struct buffer_head *bh), TP_ARGS(bh) ); /** * block_dirty_buffer - mark a buffer dirty * @bh: buffer_head being dirtied * * Called from mark_buffer_dirty(). */ DEFINE_EVENT(block_buffer, block_dirty_buffer, TP_PROTO(struct buffer_head *bh), TP_ARGS(bh) ); /** * block_rq_requeue - place block IO request back on a queue * @q: queue holding operation * @rq: block IO operation request * * The block operation request @rq is being placed back into queue * @q. For some reason the request was not completed and needs to be * put back in the queue. */ TRACE_EVENT(block_rq_requeue, TP_PROTO(struct request_queue *q, struct request *rq), TP_ARGS(q, rq), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __array( char, rwbs, RWBS_LEN ) __dynamic_array( char, cmd, 1 ) ), TP_fast_assign( __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0; __entry->sector = blk_rq_trace_sector(rq); __entry->nr_sector = blk_rq_trace_nr_sectors(rq); blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq)); __get_str(cmd)[0] = '\0'; ), TP_printk("%d,%d %s (%s) %llu + %u [%d]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, __get_str(cmd), (unsigned long long)__entry->sector, __entry->nr_sector, 0) ); /** * block_rq_complete - block IO operation completed by device driver * @rq: block operations request * @error: status code * @nr_bytes: number of completed bytes * * The block_rq_complete tracepoint event indicates that some portion * of operation request has been completed by the device driver. If * the @rq->bio is %NULL, then there is absolutely no additional work to * do for the request. If @rq->bio is non-NULL then there is * additional work required to complete the request. */ TRACE_EVENT(block_rq_complete, TP_PROTO(struct request *rq, int error, unsigned int nr_bytes), TP_ARGS(rq, error, nr_bytes), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __field( int, error ) __array( char, rwbs, RWBS_LEN ) __dynamic_array( char, cmd, 1 ) ), TP_fast_assign( __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0; __entry->sector = blk_rq_pos(rq); __entry->nr_sector = nr_bytes >> 9; __entry->error = error; blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, nr_bytes); __get_str(cmd)[0] = '\0'; ), TP_printk("%d,%d %s (%s) %llu + %u [%d]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, __get_str(cmd), (unsigned long long)__entry->sector, __entry->nr_sector, __entry->error) ); DECLARE_EVENT_CLASS(block_rq, TP_PROTO(struct request_queue *q, struct request *rq), TP_ARGS(q, rq), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __field( unsigned int, bytes ) __array( char, rwbs, RWBS_LEN ) __array( char, comm, TASK_COMM_LEN ) __dynamic_array( char, cmd, 1 ) ), TP_fast_assign( __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0; __entry->sector = blk_rq_trace_sector(rq); __entry->nr_sector = blk_rq_trace_nr_sectors(rq); __entry->bytes = blk_rq_bytes(rq); blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq)); __get_str(cmd)[0] = '\0'; memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("%d,%d %s %u (%s) %llu + %u [%s]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, __entry->bytes, __get_str(cmd), (unsigned long long)__entry->sector, __entry->nr_sector, __entry->comm) ); /** * block_rq_insert - insert block operation request into queue * @q: target queue * @rq: block IO operation request * * Called immediately before block operation request @rq is inserted * into queue @q. The fields in the operation request @rq struct can * be examined to determine which device and sectors the pending * operation would access. */ DEFINE_EVENT(block_rq, block_rq_insert, TP_PROTO(struct request_queue *q, struct request *rq), TP_ARGS(q, rq) ); /** * block_rq_issue - issue pending block IO request operation to device driver * @q: queue holding operation * @rq: block IO operation operation request * * Called when block operation request @rq from queue @q is sent to a * device driver for processing. */ DEFINE_EVENT(block_rq, block_rq_issue, TP_PROTO(struct request_queue *q, struct request *rq), TP_ARGS(q, rq) ); /** * block_rq_merge - merge request with another one in the elevator * @q: queue holding operation * @rq: block IO operation operation request * * Called when block operation request @rq from queue @q is merged to another * request queued in the elevator. */ DEFINE_EVENT(block_rq, block_rq_merge, TP_PROTO(struct request_queue *q, struct request *rq), TP_ARGS(q, rq) ); /** * block_bio_bounce - used bounce buffer when processing block operation * @q: queue holding the block operation * @bio: block operation * * A bounce buffer was used to handle the block operation @bio in @q. * This occurs when hardware limitations prevent a direct transfer of * data between the @bio data memory area and the IO device. Use of a * bounce buffer requires extra copying of data and decreases * performance. */ TRACE_EVENT(block_bio_bounce, TP_PROTO(struct request_queue *q, struct bio *bio), TP_ARGS(q, bio), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __array( char, rwbs, RWBS_LEN ) __array( char, comm, TASK_COMM_LEN ) ), TP_fast_assign( __entry->dev = bio_dev(bio); __entry->sector = bio->bi_iter.bi_sector; __entry->nr_sector = bio_sectors(bio); blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size); memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("%d,%d %s %llu + %u [%s]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, __entry->nr_sector, __entry->comm) ); /** * block_bio_complete - completed all work on the block operation * @q: queue holding the block operation * @bio: block operation completed * * This tracepoint indicates there is no further work to do on this * block IO operation @bio. */ TRACE_EVENT(block_bio_complete, TP_PROTO(struct request_queue *q, struct bio *bio), TP_ARGS(q, bio), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned, nr_sector ) __field( int, error ) __array( char, rwbs, RWBS_LEN) ), TP_fast_assign( __entry->dev = bio_dev(bio); __entry->sector = bio->bi_iter.bi_sector; __entry->nr_sector = bio_sectors(bio); __entry->error = blk_status_to_errno(bio->bi_status); blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size); ), TP_printk("%d,%d %s %llu + %u [%d]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, __entry->nr_sector, __entry->error) ); DECLARE_EVENT_CLASS(block_bio_merge, TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio), TP_ARGS(q, rq, bio), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __array( char, rwbs, RWBS_LEN ) __array( char, comm, TASK_COMM_LEN ) ), TP_fast_assign( __entry->dev = bio_dev(bio); __entry->sector = bio->bi_iter.bi_sector; __entry->nr_sector = bio_sectors(bio); blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size); memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("%d,%d %s %llu + %u [%s]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, __entry->nr_sector, __entry->comm) ); /** * block_bio_backmerge - merging block operation to the end of an existing operation * @q: queue holding operation * @rq: request bio is being merged into * @bio: new block operation to merge * * Merging block request @bio to the end of an existing block request * in queue @q. */ DEFINE_EVENT(block_bio_merge, block_bio_backmerge, TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio), TP_ARGS(q, rq, bio) ); /** * block_bio_frontmerge - merging block operation to the beginning of an existing operation * @q: queue holding operation * @rq: request bio is being merged into * @bio: new block operation to merge * * Merging block IO operation @bio to the beginning of an existing block * operation in queue @q. */ DEFINE_EVENT(block_bio_merge, block_bio_frontmerge, TP_PROTO(struct request_queue *q, struct request *rq, struct bio *bio), TP_ARGS(q, rq, bio) ); /** * block_bio_queue - putting new block IO operation in queue * @q: queue holding operation * @bio: new block operation * * About to place the block IO operation @bio into queue @q. */ TRACE_EVENT(block_bio_queue, TP_PROTO(struct request_queue *q, struct bio *bio), TP_ARGS(q, bio), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __array( char, rwbs, RWBS_LEN ) __array( char, comm, TASK_COMM_LEN ) ), TP_fast_assign( __entry->dev = bio_dev(bio); __entry->sector = bio->bi_iter.bi_sector; __entry->nr_sector = bio_sectors(bio); blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size); memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("%d,%d %s %llu + %u [%s]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, __entry->nr_sector, __entry->comm) ); DECLARE_EVENT_CLASS(block_get_rq, TP_PROTO(struct request_queue *q, struct bio *bio, int rw), TP_ARGS(q, bio, rw), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __array( char, rwbs, RWBS_LEN ) __array( char, comm, TASK_COMM_LEN ) ), TP_fast_assign( __entry->dev = bio ? bio_dev(bio) : 0; __entry->sector = bio ? bio->bi_iter.bi_sector : 0; __entry->nr_sector = bio ? bio_sectors(bio) : 0; blk_fill_rwbs(__entry->rwbs, bio ? bio->bi_opf : 0, __entry->nr_sector); memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("%d,%d %s %llu + %u [%s]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, __entry->nr_sector, __entry->comm) ); /** * block_getrq - get a free request entry in queue for block IO operations * @q: queue for operations * @bio: pending block IO operation (can be %NULL) * @rw: low bit indicates a read (%0) or a write (%1) * * A request struct for queue @q has been allocated to handle the * block IO operation @bio. */ DEFINE_EVENT(block_get_rq, block_getrq, TP_PROTO(struct request_queue *q, struct bio *bio, int rw), TP_ARGS(q, bio, rw) ); /** * block_sleeprq - waiting to get a free request entry in queue for block IO operation * @q: queue for operation * @bio: pending block IO operation (can be %NULL) * @rw: low bit indicates a read (%0) or a write (%1) * * In the case where a request struct cannot be provided for queue @q * the process needs to wait for an request struct to become * available. This tracepoint event is generated each time the * process goes to sleep waiting for request struct become available. */ DEFINE_EVENT(block_get_rq, block_sleeprq, TP_PROTO(struct request_queue *q, struct bio *bio, int rw), TP_ARGS(q, bio, rw) ); /** * block_plug - keep operations requests in request queue * @q: request queue to plug * * Plug the request queue @q. Do not allow block operation requests * to be sent to the device driver. Instead, accumulate requests in * the queue to improve throughput performance of the block device. */ TRACE_EVENT(block_plug, TP_PROTO(struct request_queue *q), TP_ARGS(q), TP_STRUCT__entry( __array( char, comm, TASK_COMM_LEN ) ), TP_fast_assign( memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("[%s]", __entry->comm) ); DECLARE_EVENT_CLASS(block_unplug, TP_PROTO(struct request_queue *q, unsigned int depth, bool explicit), TP_ARGS(q, depth, explicit), TP_STRUCT__entry( __field( int, nr_rq ) __array( char, comm, TASK_COMM_LEN ) ), TP_fast_assign( __entry->nr_rq = depth; memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("[%s] %d", __entry->comm, __entry->nr_rq) ); /** * block_unplug - release of operations requests in request queue * @q: request queue to unplug * @depth: number of requests just added to the queue * @explicit: whether this was an explicit unplug, or one from schedule() * * Unplug request queue @q because device driver is scheduled to work * on elements in the request queue. */ DEFINE_EVENT(block_unplug, block_unplug, TP_PROTO(struct request_queue *q, unsigned int depth, bool explicit), TP_ARGS(q, depth, explicit) ); /** * block_split - split a single bio struct into two bio structs * @q: queue containing the bio * @bio: block operation being split * @new_sector: The starting sector for the new bio * * The bio request @bio in request queue @q needs to be split into two * bio requests. The newly created @bio request starts at * @new_sector. This split may be required due to hardware limitation * such as operation crossing device boundaries in a RAID system. */ TRACE_EVENT(block_split, TP_PROTO(struct request_queue *q, struct bio *bio, unsigned int new_sector), TP_ARGS(q, bio, new_sector), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( sector_t, new_sector ) __array( char, rwbs, RWBS_LEN ) __array( char, comm, TASK_COMM_LEN ) ), TP_fast_assign( __entry->dev = bio_dev(bio); __entry->sector = bio->bi_iter.bi_sector; __entry->new_sector = new_sector; blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size); memcpy(__entry->comm, current->comm, TASK_COMM_LEN); ), TP_printk("%d,%d %s %llu / %llu [%s]", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, (unsigned long long)__entry->new_sector, __entry->comm) ); /** * block_bio_remap - map request for a logical device to the raw device * @q: queue holding the operation * @bio: revised operation * @dev: device for the operation * @from: original sector for the operation * * An operation for a logical device has been mapped to the * raw block device. */ TRACE_EVENT(block_bio_remap, TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev, sector_t from), TP_ARGS(q, bio, dev, from), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __field( dev_t, old_dev ) __field( sector_t, old_sector ) __array( char, rwbs, RWBS_LEN) ), TP_fast_assign( __entry->dev = bio_dev(bio); __entry->sector = bio->bi_iter.bi_sector; __entry->nr_sector = bio_sectors(bio); __entry->old_dev = dev; __entry->old_sector = from; blk_fill_rwbs(__entry->rwbs, bio->bi_opf, bio->bi_iter.bi_size); ), TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, __entry->nr_sector, MAJOR(__entry->old_dev), MINOR(__entry->old_dev), (unsigned long long)__entry->old_sector) ); /** * block_rq_remap - map request for a block operation request * @q: queue holding the operation * @rq: block IO operation request * @dev: device for the operation * @from: original sector for the operation * * The block operation request @rq in @q has been remapped. The block * operation request @rq holds the current information and @from hold * the original sector. */ TRACE_EVENT(block_rq_remap, TP_PROTO(struct request_queue *q, struct request *rq, dev_t dev, sector_t from), TP_ARGS(q, rq, dev, from), TP_STRUCT__entry( __field( dev_t, dev ) __field( sector_t, sector ) __field( unsigned int, nr_sector ) __field( dev_t, old_dev ) __field( sector_t, old_sector ) __field( unsigned int, nr_bios ) __array( char, rwbs, RWBS_LEN) ), TP_fast_assign( __entry->dev = disk_devt(rq->rq_disk); __entry->sector = blk_rq_pos(rq); __entry->nr_sector = blk_rq_sectors(rq); __entry->old_dev = dev; __entry->old_sector = from; __entry->nr_bios = blk_rq_count_bios(rq); blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq)); ), TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu %u", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs, (unsigned long long)__entry->sector, __entry->nr_sector, MAJOR(__entry->old_dev), MINOR(__entry->old_dev), (unsigned long long)__entry->old_sector, __entry->nr_bios) ); #endif /* _TRACE_BLOCK_H */ /* This part must be outside protection */ #include <trace/define_trace.h>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 /* SPDX-License-Identifier: GPL-2.0-or-later */ /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for inet_sock * * Authors: Many, reorganised here by * Arnaldo Carvalho de Melo <acme@mandriva.com> */ #ifndef _INET_SOCK_H #define _INET_SOCK_H #include <linux/bitops.h> #include <linux/string.h> #include <linux/types.h> #include <linux/jhash.h> #include <linux/netdevice.h> #include <net/flow.h> #include <net/sock.h> #include <net/request_sock.h> #include <net/netns/hash.h> #include <net/tcp_states.h> #include <net/l3mdev.h> /** struct ip_options - IP Options * * @faddr - Saved first hop address * @nexthop - Saved nexthop address in LSRR and SSRR * @is_strictroute - Strict source route * @srr_is_hit - Packet destination addr was our one * @is_changed - IP checksum more not valid * @rr_needaddr - Need to record addr of outgoing dev * @ts_needtime - Need to record timestamp * @ts_needaddr - Need to record addr of outgoing dev */ struct ip_options { __be32 faddr; __be32 nexthop; unsigned char optlen; unsigned char srr; unsigned char rr; unsigned char ts; unsigned char is_strictroute:1, srr_is_hit:1, is_changed:1, rr_needaddr:1, ts_needtime:1, ts_needaddr:1; unsigned char router_alert; unsigned char cipso; unsigned char __pad2; unsigned char __data[]; }; struct ip_options_rcu { struct rcu_head rcu; struct ip_options opt; }; struct ip_options_data { struct ip_options_rcu opt; char data[40]; }; struct inet_request_sock { struct request_sock req; #define ir_loc_addr req.__req_common.skc_rcv_saddr #define ir_rmt_addr req.__req_common.skc_daddr #define ir_num req.__req_common.skc_num #define ir_rmt_port req.__req_common.skc_dport #define ir_v6_rmt_addr req.__req_common.skc_v6_daddr #define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr #define ir_iif req.__req_common.skc_bound_dev_if #define ir_cookie req.__req_common.skc_cookie #define ireq_net req.__req_common.skc_net #define ireq_state req.__req_common.skc_state #define ireq_family req.__req_common.skc_family u16 snd_wscale : 4, rcv_wscale : 4, tstamp_ok : 1, sack_ok : 1, wscale_ok : 1, ecn_ok : 1, acked : 1, no_srccheck: 1, smc_ok : 1; u32 ir_mark; union { struct ip_options_rcu __rcu *ireq_opt; #if IS_ENABLED(CONFIG_IPV6) struct { struct ipv6_txoptions *ipv6_opt; struct sk_buff *pktopts; }; #endif }; }; static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) { return (struct inet_request_sock *)sk; } static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb) { if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) return skb->mark; return sk->sk_mark; } static inline int inet_request_bound_dev_if(const struct sock *sk, struct sk_buff *skb) { #ifdef CONFIG_NET_L3_MASTER_DEV struct net *net = sock_net(sk); if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept) return l3mdev_master_ifindex_by_index(net, skb->skb_iif); #endif return sk->sk_bound_dev_if; } static inline int inet_sk_bound_l3mdev(const struct sock *sk) { #ifdef CONFIG_NET_L3_MASTER_DEV struct net *net = sock_net(sk); if (!net->ipv4.sysctl_tcp_l3mdev_accept) return l3mdev_master_ifindex_by_index(net, sk->sk_bound_dev_if); #endif return 0; } static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if, int dif, int sdif) { if (!bound_dev_if) return !sdif || l3mdev_accept; return bound_dev_if == dif || bound_dev_if == sdif; } struct inet_cork { unsigned int flags; __be32 addr; struct ip_options *opt; unsigned int fragsize; int length; /* Total length of all frames */ struct dst_entry *dst; u8 tx_flags; __u8 ttl; __s16 tos; char priority; __u16 gso_size; u64 transmit_time; u32 mark; }; struct inet_cork_full { struct inet_cork base; struct flowi fl; }; struct ip_mc_socklist; struct ipv6_pinfo; struct rtable; /** struct inet_sock - representation of INET sockets * * @sk - ancestor class * @pinet6 - pointer to IPv6 control block * @inet_daddr - Foreign IPv4 addr * @inet_rcv_saddr - Bound local IPv4 addr * @inet_dport - Destination port * @inet_num - Local port * @inet_saddr - Sending source * @uc_ttl - Unicast TTL * @inet_sport - Source port * @inet_id - ID counter for DF pkts * @tos - TOS * @mc_ttl - Multicasting TTL * @is_icsk - is this an inet_connection_sock? * @uc_index - Unicast outgoing device index * @mc_index - Multicast device index * @mc_list - Group array * @cork - info to build ip hdr on each ip frag while socket is corked */ struct inet_sock { /* sk and pinet6 has to be the first two members of inet_sock */ struct sock sk; #if IS_ENABLED(CONFIG_IPV6) struct ipv6_pinfo *pinet6; #endif /* Socket demultiplex comparisons on incoming packets. */ #define inet_daddr sk.__sk_common.skc_daddr #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr #define inet_dport sk.__sk_common.skc_dport #define inet_num sk.__sk_common.skc_num __be32 inet_saddr; __s16 uc_ttl; __u16 cmsg_flags; __be16 inet_sport; __u16 inet_id; struct ip_options_rcu __rcu *inet_opt; int rx_dst_ifindex; __u8 tos; __u8 min_ttl; __u8 mc_ttl; __u8 pmtudisc; __u8 recverr:1, is_icsk:1, freebind:1, hdrincl:1, mc_loop:1, transparent:1, mc_all:1, nodefrag:1; __u8 bind_address_no_port:1, recverr_rfc4884:1, defer_connect:1; /* Indicates that fastopen_connect is set * and cookie exists so we defer connect * until first data frame is written */ __u8 rcv_tos; __u8 convert_csum; int uc_index; int mc_index; __be32 mc_addr; struct ip_mc_socklist __rcu *mc_list; struct inet_cork_full cork; }; #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ /* cmsg flags for inet */ #define IP_CMSG_PKTINFO BIT(0) #define IP_CMSG_TTL BIT(1) #define IP_CMSG_TOS BIT(2) #define IP_CMSG_RECVOPTS BIT(3) #define IP_CMSG_RETOPTS BIT(4) #define IP_CMSG_PASSSEC BIT(5) #define IP_CMSG_ORIGDSTADDR BIT(6) #define IP_CMSG_CHECKSUM BIT(7) #define IP_CMSG_RECVFRAGSIZE BIT(8) /** * sk_to_full_sk - Access to a full socket * @sk: pointer to a socket * * SYNACK messages might be attached to request sockets. * Some places want to reach the listener in this case. */ static inline struct sock *sk_to_full_sk(struct sock *sk) { #ifdef CONFIG_INET if (sk && sk->sk_state == TCP_NEW_SYN_RECV) sk = inet_reqsk(sk)->rsk_listener; #endif return sk; } /* sk_to_full_sk() variant with a const argument */ static inline const struct sock *sk_const_to_full_sk(const struct sock *sk) { #ifdef CONFIG_INET if (sk && sk->sk_state == TCP_NEW_SYN_RECV) sk = ((const struct request_sock *)sk)->rsk_listener; #endif return sk; } static inline struct sock *skb_to_full_sk(const struct sk_buff *skb) { return sk_to_full_sk(skb->sk); } static inline struct inet_sock *inet_sk(const struct sock *sk) { return (struct inet_sock *)sk; } static inline void __inet_sk_copy_descendant(struct sock *sk_to, const struct sock *sk_from, const int ancestor_size) { memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, sk_from->sk_prot->obj_size - ancestor_size); } int inet_sk_rebuild_header(struct sock *sk); /** * inet_sk_state_load - read sk->sk_state for lockless contexts * @sk: socket pointer * * Paired with inet_sk_state_store(). Used in places we don't hold socket lock: * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... */ static inline int inet_sk_state_load(const struct sock *sk) { /* state change might impact lockless readers. */ return smp_load_acquire(&sk->sk_state); } /** * inet_sk_state_store - update sk->sk_state * @sk: socket pointer * @newstate: new state * * Paired with inet_sk_state_load(). Should be used in contexts where * state change might impact lockless readers. */ void inet_sk_state_store(struct sock *sk, int newstate); void inet_sk_set_state(struct sock *sk, int state); static inline unsigned int __inet_ehashfn(const __be32 laddr, const __u16 lport, const __be32 faddr, const __be16 fport, u32 initval) { return jhash_3words((__force __u32) laddr, (__force __u32) faddr, ((__u32) lport) << 16 | (__force __u32)fport, initval); } struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener, bool attach_listener); static inline __u8 inet_sk_flowi_flags(const struct sock *sk) { __u8 flags = 0; if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl) flags |= FLOWI_FLAG_ANYSRC; return flags; } static inline void inet_inc_convert_csum(struct sock *sk) { inet_sk(sk)->convert_csum++; } static inline void inet_dec_convert_csum(struct sock *sk) { if (inet_sk(sk)->convert_csum > 0) inet_sk(sk)->convert_csum--; } static inline bool inet_get_convert_csum(struct sock *sk) { return !!inet_sk(sk)->convert_csum; } static inline bool inet_can_nonlocal_bind(struct net *net, struct inet_sock *inet) { return net->ipv4.sysctl_ip_nonlocal_bind || inet->freebind || inet->transparent; } #endif /* _INET_SOCK_H */
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 /* SPDX-License-Identifier: GPL-2.0 */ #undef TRACE_SYSTEM #define TRACE_SYSTEM migrate #if !defined(_TRACE_MIGRATE_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_MIGRATE_H #include <linux/tracepoint.h> #define MIGRATE_MODE \ EM( MIGRATE_ASYNC, "MIGRATE_ASYNC") \ EM( MIGRATE_SYNC_LIGHT, "MIGRATE_SYNC_LIGHT") \ EMe(MIGRATE_SYNC, "MIGRATE_SYNC") #define MIGRATE_REASON \ EM( MR_COMPACTION, "compaction") \ EM( MR_MEMORY_FAILURE, "memory_failure") \ EM( MR_MEMORY_HOTPLUG, "memory_hotplug") \ EM( MR_SYSCALL, "syscall_or_cpuset") \ EM( MR_MEMPOLICY_MBIND, "mempolicy_mbind") \ EM( MR_NUMA_MISPLACED, "numa_misplaced") \ EMe(MR_CONTIG_RANGE, "contig_range") /* * First define the enums in the above macros to be exported to userspace * via TRACE_DEFINE_ENUM(). */ #undef EM #undef EMe #define EM(a, b) TRACE_DEFINE_ENUM(a); #define EMe(a, b) TRACE_DEFINE_ENUM(a); MIGRATE_MODE MIGRATE_REASON /* * Now redefine the EM() and EMe() macros to map the enums to the strings * that will be printed in the output. */ #undef EM #undef EMe #define EM(a, b) {a, b}, #define EMe(a, b) {a, b} TRACE_EVENT(mm_migrate_pages, TP_PROTO(unsigned long succeeded, unsigned long failed, unsigned long thp_succeeded, unsigned long thp_failed, unsigned long thp_split, enum migrate_mode mode, int reason), TP_ARGS(succeeded, failed, thp_succeeded, thp_failed, thp_split, mode, reason), TP_STRUCT__entry( __field( unsigned long, succeeded) __field( unsigned long, failed) __field( unsigned long, thp_succeeded) __field( unsigned long, thp_failed) __field( unsigned long, thp_split) __field( enum migrate_mode, mode) __field( int, reason) ), TP_fast_assign( __entry->succeeded = succeeded; __entry->failed = failed; __entry->thp_succeeded = thp_succeeded; __entry->thp_failed = thp_failed; __entry->thp_split = thp_split; __entry->mode = mode; __entry->reason = reason; ), TP_printk("nr_succeeded=%lu nr_failed=%lu nr_thp_succeeded=%lu nr_thp_failed=%lu nr_thp_split=%lu mode=%s reason=%s", __entry->succeeded, __entry->failed, __entry->thp_succeeded, __entry->thp_failed, __entry->thp_split, __print_symbolic(__entry->mode, MIGRATE_MODE), __print_symbolic(__entry->reason, MIGRATE_REASON)) ); #endif /* _TRACE_MIGRATE_H */ /* This part must be outside protection */ #include <trace/define_trace.h>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 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= 0, CPUHP_CREATE_THREADS, CPUHP_PERF_PREPARE, CPUHP_PERF_X86_PREPARE, CPUHP_PERF_X86_AMD_UNCORE_PREP, CPUHP_PERF_POWER, CPUHP_PERF_SUPERH, CPUHP_X86_HPET_DEAD, CPUHP_X86_APB_DEAD, CPUHP_X86_MCE_DEAD, CPUHP_VIRT_NET_DEAD, CPUHP_SLUB_DEAD, CPUHP_DEBUG_OBJ_DEAD, CPUHP_MM_WRITEBACK_DEAD, CPUHP_MM_VMSTAT_DEAD, CPUHP_SOFTIRQ_DEAD, CPUHP_NET_MVNETA_DEAD, CPUHP_CPUIDLE_DEAD, CPUHP_ARM64_FPSIMD_DEAD, CPUHP_ARM_OMAP_WAKE_DEAD, CPUHP_IRQ_POLL_DEAD, CPUHP_BLOCK_SOFTIRQ_DEAD, CPUHP_ACPI_CPUDRV_DEAD, CPUHP_S390_PFAULT_DEAD, CPUHP_BLK_MQ_DEAD, CPUHP_FS_BUFF_DEAD, CPUHP_PRINTK_DEAD, CPUHP_MM_MEMCQ_DEAD, CPUHP_PERCPU_CNT_DEAD, CPUHP_RADIX_DEAD, CPUHP_PAGE_ALLOC_DEAD, CPUHP_NET_DEV_DEAD, CPUHP_PCI_XGENE_DEAD, CPUHP_IOMMU_INTEL_DEAD, CPUHP_LUSTRE_CFS_DEAD, CPUHP_AP_ARM_CACHE_B15_RAC_DEAD, CPUHP_PADATA_DEAD, CPUHP_WORKQUEUE_PREP, CPUHP_POWER_NUMA_PREPARE, CPUHP_HRTIMERS_PREPARE, CPUHP_PROFILE_PREPARE, CPUHP_X2APIC_PREPARE, CPUHP_SMPCFD_PREPARE, CPUHP_RELAY_PREPARE, CPUHP_SLAB_PREPARE, CPUHP_MD_RAID5_PREPARE, CPUHP_RCUTREE_PREP, CPUHP_CPUIDLE_COUPLED_PREPARE, CPUHP_POWERPC_PMAC_PREPARE, CPUHP_POWERPC_MMU_CTX_PREPARE, CPUHP_XEN_PREPARE, CPUHP_XEN_EVTCHN_PREPARE, CPUHP_ARM_SHMOBILE_SCU_PREPARE, CPUHP_SH_SH3X_PREPARE, CPUHP_NET_FLOW_PREPARE, CPUHP_TOPOLOGY_PREPARE, CPUHP_NET_IUCV_PREPARE, CPUHP_ARM_BL_PREPARE, CPUHP_TRACE_RB_PREPARE, CPUHP_MM_ZS_PREPARE, CPUHP_MM_ZSWP_MEM_PREPARE, CPUHP_MM_ZSWP_POOL_PREPARE, CPUHP_KVM_PPC_BOOK3S_PREPARE, CPUHP_ZCOMP_PREPARE, CPUHP_TIMERS_PREPARE, CPUHP_MIPS_SOC_PREPARE, CPUHP_BP_PREPARE_DYN, CPUHP_BP_PREPARE_DYN_END = CPUHP_BP_PREPARE_DYN + 20, CPUHP_BRINGUP_CPU, CPUHP_AP_IDLE_DEAD, CPUHP_AP_OFFLINE, CPUHP_AP_SCHED_STARTING, CPUHP_AP_RCUTREE_DYING, CPUHP_AP_CPU_PM_STARTING, CPUHP_AP_IRQ_GIC_STARTING, CPUHP_AP_IRQ_HIP04_STARTING, CPUHP_AP_IRQ_ARMADA_XP_STARTING, CPUHP_AP_IRQ_BCM2836_STARTING, CPUHP_AP_IRQ_MIPS_GIC_STARTING, CPUHP_AP_IRQ_RISCV_STARTING, CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING, CPUHP_AP_ARM_MVEBU_COHERENCY, CPUHP_AP_MICROCODE_LOADER, CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, CPUHP_AP_PERF_X86_STARTING, CPUHP_AP_PERF_X86_AMD_IBS_STARTING, CPUHP_AP_PERF_X86_CQM_STARTING, CPUHP_AP_PERF_X86_CSTATE_STARTING, CPUHP_AP_PERF_XTENSA_STARTING, CPUHP_AP_MIPS_OP_LOONGSON3_STARTING, CPUHP_AP_ARM_SDEI_STARTING, CPUHP_AP_ARM_VFP_STARTING, CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING, CPUHP_AP_PERF_ARM_ACPI_STARTING, CPUHP_AP_PERF_ARM_STARTING, CPUHP_AP_ARM_L2X0_STARTING, CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, CPUHP_AP_ARM_ARCH_TIMER_STARTING, CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, CPUHP_AP_JCORE_TIMER_STARTING, CPUHP_AP_ARM_TWD_STARTING, CPUHP_AP_QCOM_TIMER_STARTING, CPUHP_AP_TEGRA_TIMER_STARTING, CPUHP_AP_ARMADA_TIMER_STARTING, CPUHP_AP_MARCO_TIMER_STARTING, CPUHP_AP_MIPS_GIC_TIMER_STARTING, CPUHP_AP_ARC_TIMER_STARTING, CPUHP_AP_RISCV_TIMER_STARTING, CPUHP_AP_CLINT_TIMER_STARTING, CPUHP_AP_CSKY_TIMER_STARTING, CPUHP_AP_TI_GP_TIMER_STARTING, CPUHP_AP_HYPERV_TIMER_STARTING, CPUHP_AP_KVM_STARTING, CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, CPUHP_AP_KVM_ARM_VGIC_STARTING, CPUHP_AP_KVM_ARM_TIMER_STARTING, /* Must be the last timer callback */ CPUHP_AP_DUMMY_TIMER_STARTING, CPUHP_AP_ARM_XEN_STARTING, CPUHP_AP_ARM_CORESIGHT_STARTING, CPUHP_AP_ARM_CORESIGHT_CTI_STARTING, CPUHP_AP_ARM64_ISNDEP_STARTING, CPUHP_AP_SMPCFD_DYING, CPUHP_AP_X86_TBOOT_DYING, CPUHP_AP_ARM_CACHE_B15_RAC_DYING, CPUHP_AP_ONLINE, CPUHP_TEARDOWN_CPU, CPUHP_AP_ONLINE_IDLE, CPUHP_AP_SMPBOOT_THREADS, CPUHP_AP_X86_VDSO_VMA_ONLINE, CPUHP_AP_IRQ_AFFINITY_ONLINE, CPUHP_AP_BLK_MQ_ONLINE, CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, CPUHP_AP_X86_INTEL_EPB_ONLINE, CPUHP_AP_PERF_ONLINE, CPUHP_AP_PERF_X86_ONLINE, CPUHP_AP_PERF_X86_UNCORE_ONLINE, CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, CPUHP_AP_PERF_X86_AMD_POWER_ONLINE, CPUHP_AP_PERF_X86_RAPL_ONLINE, CPUHP_AP_PERF_X86_CQM_ONLINE, CPUHP_AP_PERF_X86_CSTATE_ONLINE, CPUHP_AP_PERF_S390_CF_ONLINE, CPUHP_AP_PERF_S390_SF_ONLINE, CPUHP_AP_PERF_ARM_CCI_ONLINE, CPUHP_AP_PERF_ARM_CCN_ONLINE, CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE, CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, CPUHP_AP_PERF_ARM_L2X0_ONLINE, CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE, CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE, CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE, CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE, CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE, CPUHP_AP_WATCHDOG_ONLINE, CPUHP_AP_WORKQUEUE_ONLINE, CPUHP_AP_RCUTREE_ONLINE, CPUHP_AP_BASE_CACHEINFO_ONLINE, CPUHP_AP_ONLINE_DYN, CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30, CPUHP_AP_X86_HPET_ONLINE, CPUHP_AP_X86_KVM_CLK_ONLINE, CPUHP_AP_ACTIVE, CPUHP_ONLINE, }; int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu), bool multi_instance); int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, bool invoke, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu), bool multi_instance); /** * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks * @state: The state for which the calls are installed * @name: Name of the callback (will be used in debug output) * @startup: startup callback function * @teardown: teardown callback function * * Installs the callback functions and invokes the startup callback on * the present cpus which have already reached the @state. */ static inline int cpuhp_setup_state(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)) { return __cpuhp_setup_state(state, name, true, startup, teardown, false); } static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)) { return __cpuhp_setup_state_cpuslocked(state, name, true, startup, teardown, false); } /** * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the * callbacks * @state: The state for which the calls are installed * @name: Name of the callback. * @startup: startup callback function * @teardown: teardown callback function * * Same as @cpuhp_setup_state except that no calls are executed are invoked * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n. */ static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)) { return __cpuhp_setup_state(state, name, false, startup, teardown, false); } static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)) { return __cpuhp_setup_state_cpuslocked(state, name, false, startup, teardown, false); } /** * cpuhp_setup_state_multi - Add callbacks for multi state * @state: The state for which the calls are installed * @name: Name of the callback. * @startup: startup callback function * @teardown: teardown callback function * * Sets the internal multi_instance flag and prepares a state to work as a multi * instance callback. No callbacks are invoked at this point. The callbacks are * invoked once an instance for this state are registered via * @cpuhp_state_add_instance or @cpuhp_state_add_instance_nocalls. */ static inline int cpuhp_setup_state_multi(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu, struct hlist_node *node), int (*teardown)(unsigned int cpu, struct hlist_node *node)) { return __cpuhp_setup_state(state, name, false, (void *) startup, (void *) teardown, true); } int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, bool invoke); int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, struct hlist_node *node, bool invoke); /** * cpuhp_state_add_instance - Add an instance for a state and invoke startup * callback. * @state: The state for which the instance is installed * @node: The node for this individual state. * * Installs the instance for the @state and invokes the startup callback on * the present cpus which have already reached the @state. The @state must have * been earlier marked as multi-instance by @cpuhp_setup_state_multi. */ static inline int cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node) { return __cpuhp_state_add_instance(state, node, true); } /** * cpuhp_state_add_instance_nocalls - Add an instance for a state without * invoking the startup callback. * @state: The state for which the instance is installed * @node: The node for this individual state. * * Installs the instance for the @state The @state must have been earlier * marked as multi-instance by @cpuhp_setup_state_multi. */ static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state, struct hlist_node *node) { return __cpuhp_state_add_instance(state, node, false); } static inline int cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state, struct hlist_node *node) { return __cpuhp_state_add_instance_cpuslocked(state, node, false); } void __cpuhp_remove_state(enum cpuhp_state state, bool invoke); void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke); /** * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown * @state: The state for which the calls are removed * * Removes the callback functions and invokes the teardown callback on * the present cpus which have already reached the @state. */ static inline void cpuhp_remove_state(enum cpuhp_state state) { __cpuhp_remove_state(state, true); } /** * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking * teardown * @state: The state for which the calls are removed */ static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state) { __cpuhp_remove_state(state, false); } static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state) { __cpuhp_remove_state_cpuslocked(state, false); } /** * cpuhp_remove_multi_state - Remove hotplug multi state callback * @state: The state for which the calls are removed * * Removes the callback functions from a multi state. This is the reverse of * cpuhp_setup_state_multi(). All instances should have been removed before * invoking this function. */ static inline void cpuhp_remove_multi_state(enum cpuhp_state state) { __cpuhp_remove_state(state, false); } int __cpuhp_state_remove_instance(enum cpuhp_state state, struct hlist_node *node, bool invoke); /** * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke * the teardown callback * @state: The state from which the instance is removed * @node: The node for this individual state. * * Removes the instance and invokes the teardown callback on the present cpus * which have already reached the @state. */ static inline int cpuhp_state_remove_instance(enum cpuhp_state state, struct hlist_node *node) { return __cpuhp_state_remove_instance(state, node, true); } /** * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state * without invoking the reatdown callback * @state: The state from which the instance is removed * @node: The node for this individual state. * * Removes the instance without invoking the teardown callback. */ static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state, struct hlist_node *node) { return __cpuhp_state_remove_instance(state, node, false); } #ifdef CONFIG_SMP void cpuhp_online_idle(enum cpuhp_state state); #else static inline void cpuhp_online_idle(enum cpuhp_state state) { } #endif #endif
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 /* SPDX-License-Identifier: GPL-2.0+ */ #undef TRACE_SYSTEM #define TRACE_SYSTEM rseq #if !defined(_TRACE_RSEQ_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_RSEQ_H #include <linux/tracepoint.h> #include <linux/types.h> TRACE_EVENT(rseq_update, TP_PROTO(struct task_struct *t), TP_ARGS(t), TP_STRUCT__entry( __field(s32, cpu_id) ), TP_fast_assign( __entry->cpu_id = raw_smp_processor_id(); ), TP_printk("cpu_id=%d", __entry->cpu_id) ); TRACE_EVENT(rseq_ip_fixup, TP_PROTO(unsigned long regs_ip, unsigned long start_ip, unsigned long post_commit_offset, unsigned long abort_ip), TP_ARGS(regs_ip, start_ip, post_commit_offset, abort_ip), TP_STRUCT__entry( __field(unsigned long, regs_ip) __field(unsigned long, start_ip) __field(unsigned long, post_commit_offset) __field(unsigned long, abort_ip) ), TP_fast_assign( __entry->regs_ip = regs_ip; __entry->start_ip = start_ip; __entry->post_commit_offset = post_commit_offset; __entry->abort_ip = abort_ip; ), TP_printk("regs_ip=0x%lx start_ip=0x%lx post_commit_offset=%lu abort_ip=0x%lx", __entry->regs_ip, __entry->start_ip, __entry->post_commit_offset, __entry->abort_ip) ); #endif /* _TRACE_SOCK_H */ /* This part must be outside protection */ #include <trace/define_trace.h>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_GENERIC_SECTIONS_H_ #define _ASM_GENERIC_SECTIONS_H_ /* References to section boundaries */ #include <linux/compiler.h> #include <linux/types.h> /* * Usage guidelines: * _text, _data: architecture specific, don't use them in arch-independent code * [_stext, _etext]: contains .text.* sections, may also contain .rodata.* * and/or .init.* sections * [_sdata, _edata]: contains .data.* sections, may also contain .rodata.* * and/or .init.* sections. * [__start_rodata, __end_rodata]: contains .rodata.* sections * [__start_ro_after_init, __end_ro_after_init]: * contains .data..ro_after_init section * [__init_begin, __init_end]: contains .init.* sections, but .init.text.* * may be out of this range on some architectures. * [_sinittext, _einittext]: contains .init.text.* sections * [__bss_start, __bss_stop]: contains BSS sections * * Following global variables are optional and may be unavailable on some * architectures and/or kernel configurations. * _text, _data * __kprobes_text_start, __kprobes_text_end * __entry_text_start, __entry_text_end * __ctors_start, __ctors_end * __irqentry_text_start, __irqentry_text_end * __softirqentry_text_start, __softirqentry_text_end * __start_opd, __end_opd */ extern char _text[], _stext[], _etext[]; extern char _data[], _sdata[], _edata[]; extern char __bss_start[], __bss_stop[]; extern char __init_begin[], __init_end[]; extern char _sinittext[], _einittext[]; extern char __start_ro_after_init[], __end_ro_after_init[]; extern char _end[]; extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[]; extern char __kprobes_text_start[], __kprobes_text_end[]; extern char __entry_text_start[], __entry_text_end[]; extern char __start_rodata[], __end_rodata[]; extern char __irqentry_text_start[], __irqentry_text_end[]; extern char __softirqentry_text_start[], __softirqentry_text_end[]; extern char __start_once[], __end_once[]; /* Start and end of .ctors section - used for constructor calls. */ extern char __ctors_start[], __ctors_end[]; /* Start and end of .opd section - used for function descriptors. */ extern char __start_opd[], __end_opd[]; /* Start and end of instrumentation protected text section */ extern char __noinstr_text_start[], __noinstr_text_end[]; extern __visible const void __nosave_begin, __nosave_end; /* Function descriptor handling (if any). Override in asm/sections.h */ #ifndef dereference_function_descriptor #define dereference_function_descriptor(p) ((void *)(p)) #define dereference_kernel_function_descriptor(p) ((void *)(p)) #endif /* random extra sections (if any). Override * in asm/sections.h */ #ifndef arch_is_kernel_text static inline int arch_is_kernel_text(unsigned long addr) { return 0; } #endif #ifndef arch_is_kernel_data static inline int arch_is_kernel_data(unsigned long addr) { return 0; } #endif /* * Check if an address is part of freed initmem. This is needed on architectures * with virt == phys kernel mapping, for code that wants to check if an address * is part of a static object within [_stext, _end]. After initmem is freed, * memory can be allocated from it, and such allocations would then have * addresses within the range [_stext, _end]. */ #ifndef arch_is_kernel_initmem_freed static inline int arch_is_kernel_initmem_freed(unsigned long addr) { return 0; } #endif /** * memory_contains - checks if an object is contained within a memory region * @begin: virtual address of the beginning of the memory region * @end: virtual address of the end of the memory region * @virt: virtual address of the memory object * @size: size of the memory object * * Returns: true if the object specified by @virt and @size is entirely * contained within the memory region defined by @begin and @end, false * otherwise. */ static inline bool memory_contains(void *begin, void *end, void *virt, size_t size) { return virt >= begin && virt + size <= end; } /** * memory_intersects - checks if the region occupied by an object intersects * with another memory region * @begin: virtual address of the beginning of the memory regien * @end: virtual address of the end of the memory region * @virt: virtual address of the memory object * @size: size of the memory object * * Returns: true if an object's memory region, specified by @virt and @size, * intersects with the region specified by @begin and @end, false otherwise. */ static inline bool memory_intersects(void *begin, void *end, void *virt, size_t size) { void *vend = virt + size; return (virt >= begin && virt < end) || (vend >= begin && vend < end); } /** * init_section_contains - checks if an object is contained within the init * section * @virt: virtual address of the memory object * @size: size of the memory object * * Returns: true if the object specified by @virt and @size is entirely * contained within the init section, false otherwise. */ static inline bool init_section_contains(void *virt, size_t size) { return memory_contains(__init_begin, __init_end, virt, size); } /** * init_section_intersects - checks if the region occupied by an object * intersects with the init section * @virt: virtual address of the memory object * @size: size of the memory object * * Returns: true if an object's memory region, specified by @virt and @size, * intersects with the init section, false otherwise. */ static inline bool init_section_intersects(void *virt, size_t size) { return memory_intersects(__init_begin, __init_end, virt, size); } /** * is_kernel_rodata - checks if the pointer address is located in the * .rodata section * * @addr: address to check * * Returns: true if the address is located in .rodata, false otherwise. */ static inline bool is_kernel_rodata(unsigned long addr) { return addr >= (unsigned long)__start_rodata && addr < (unsigned long)__end_rodata; } #endif /* _ASM_GENERIC_SECTIONS_H_ */
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_SCATTERLIST_H #define _LINUX_SCATTERLIST_H #include <linux/string.h> #include <linux/types.h> #include <linux/bug.h> #include <linux/mm.h> #include <asm/io.h> struct scatterlist { unsigned long page_link; unsigned int offset; unsigned int length; dma_addr_t dma_address; #ifdef CONFIG_NEED_SG_DMA_LENGTH unsigned int dma_length; #endif }; /* * Since the above length field is an unsigned int, below we define the maximum * length in bytes that can be stored in one scatterlist entry. */ #define SCATTERLIST_MAX_SEGMENT (UINT_MAX & PAGE_MASK) /* * These macros should be used after a dma_map_sg call has been done * to get bus addresses of each of the SG entries and their lengths. * You should only work with the number of sg entries dma_map_sg * returns, or alternatively stop on the first sg_dma_len(sg) which * is 0. */ #define sg_dma_address(sg) ((sg)->dma_address) #ifdef CONFIG_NEED_SG_DMA_LENGTH #define sg_dma_len(sg) ((sg)->dma_length) #else #define sg_dma_len(sg) ((sg)->length) #endif struct sg_table { struct scatterlist *sgl; /* the list */ unsigned int nents; /* number of mapped entries */ unsigned int orig_nents; /* original size of list */ }; /* * Notes on SG table design. * * We use the unsigned long page_link field in the scatterlist struct to place * the page pointer AND encode information about the sg table as well. The two * lower bits are reserved for this information. * * If bit 0 is set, then the page_link contains a pointer to the next sg * table list. Otherwise the next entry is at sg + 1. * * If bit 1 is set, then this sg entry is the last element in a list. * * See sg_next(). * */ #define SG_CHAIN 0x01UL #define SG_END 0x02UL /* * We overload the LSB of the page pointer to indicate whether it's * a valid sg entry, or whether it points to the start of a new scatterlist. * Those low bits are there for everyone! (thanks mason :-) */ #define sg_is_chain(sg) ((sg)->page_link & SG_CHAIN) #define sg_is_last(sg) ((sg)->page_link & SG_END) #define sg_chain_ptr(sg) \ ((struct scatterlist *) ((sg)->page_link & ~(SG_CHAIN | SG_END))) /** * sg_assign_page - Assign a given page to an SG entry * @sg: SG entry * @page: The page * * Description: * Assign page to sg entry. Also see sg_set_page(), the most commonly used * variant. * **/ static inline void sg_assign_page(struct scatterlist *sg, struct page *page) { unsigned long page_link = sg->page_link & (SG_CHAIN | SG_END); /* * In order for the low bit stealing approach to work, pages * must be aligned at a 32-bit boundary as a minimum. */ BUG_ON((unsigned long) page & (SG_CHAIN | SG_END)); #ifdef CONFIG_DEBUG_SG BUG_ON(sg_is_chain(sg)); #endif sg->page_link = page_link | (unsigned long) page; } /** * sg_set_page - Set sg entry to point at given page * @sg: SG entry * @page: The page * @len: Length of data * @offset: Offset into page * * Description: * Use this function to set an sg entry pointing at a page, never assign * the page directly. We encode sg table information in the lower bits * of the page pointer. See sg_page() for looking up the page belonging * to an sg entry. * **/ static inline void sg_set_page(struct scatterlist *sg, struct page *page, unsigned int len, unsigned int offset) { sg_assign_page(sg, page); sg->offset = offset; sg->length = len; } static inline struct page *sg_page(struct scatterlist *sg) { #ifdef CONFIG_DEBUG_SG BUG_ON(sg_is_chain(sg)); #endif return (struct page *)((sg)->page_link & ~(SG_CHAIN | SG_END)); } /** * sg_set_buf - Set sg entry to point at given data * @sg: SG entry * @buf: Data * @buflen: Data length * **/ static inline void sg_set_buf(struct scatterlist *sg, const void *buf, unsigned int buflen) { #ifdef CONFIG_DEBUG_SG BUG_ON(!virt_addr_valid(buf)); #endif sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf)); } /* * Loop over each sg element, following the pointer to a new list if necessary */ #define for_each_sg(sglist, sg, nr, __i) \ for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg)) /* * Loop over each sg element in the given sg_table object. */ #define for_each_sgtable_sg(sgt, sg, i) \ for_each_sg((sgt)->sgl, sg, (sgt)->orig_nents, i) /* * Loop over each sg element in the given *DMA mapped* sg_table object. * Please use sg_dma_address(sg) and sg_dma_len(sg) to extract DMA addresses * of the each element. */ #define for_each_sgtable_dma_sg(sgt, sg, i) \ for_each_sg((sgt)->sgl, sg, (sgt)->nents, i) static inline void __sg_chain(struct scatterlist *chain_sg, struct scatterlist *sgl) { /* * offset and length are unused for chain entry. Clear them. */ chain_sg->offset = 0; chain_sg->length = 0; /* * Set lowest bit to indicate a link pointer, and make sure to clear * the termination bit if it happens to be set. */ chain_sg->page_link = ((unsigned long) sgl | SG_CHAIN) & ~SG_END; } /** * sg_chain - Chain two sglists together * @prv: First scatterlist * @prv_nents: Number of entries in prv * @sgl: Second scatterlist * * Description: * Links @prv@ and @sgl@ together, to form a longer scatterlist. * **/ static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents, struct scatterlist *sgl) { __sg_chain(&prv[prv_nents - 1], sgl); } /** * sg_mark_end - Mark the end of the scatterlist * @sg: SG entryScatterlist * * Description: * Marks the passed in sg entry as the termination point for the sg * table. A call to sg_next() on this entry will return NULL. * **/ static inline void sg_mark_end(struct scatterlist *sg) { /* * Set termination bit, clear potential chain bit */ sg->page_link |= SG_END; sg->page_link &= ~SG_CHAIN; } /** * sg_unmark_end - Undo setting the end of the scatterlist * @sg: SG entryScatterlist * * Description: * Removes the termination marker from the given entry of the scatterlist. * **/ static inline void sg_unmark_end(struct scatterlist *sg) { sg->page_link &= ~SG_END; } /** * sg_phys - Return physical address of an sg entry * @sg: SG entry * * Description: * This calls page_to_phys() on the page in this sg entry, and adds the * sg offset. The caller must know that it is legal to call page_to_phys() * on the sg page. * **/ static inline dma_addr_t sg_phys(struct scatterlist *sg) { return page_to_phys(sg_page(sg)) + sg->offset; } /** * sg_virt - Return virtual address of an sg entry * @sg: SG entry * * Description: * This calls page_address() on the page in this sg entry, and adds the * sg offset. The caller must know that the sg page has a valid virtual * mapping. * **/ static inline void *sg_virt(struct scatterlist *sg) { return page_address(sg_page(sg)) + sg->offset; } /** * sg_init_marker - Initialize markers in sg table * @sgl: The SG table * @nents: Number of entries in table * **/ static inline void sg_init_marker(struct scatterlist *sgl, unsigned int nents) { sg_mark_end(&sgl[nents - 1]); } int sg_nents(struct scatterlist *sg); int sg_nents_for_len(struct scatterlist *sg, u64 len); struct scatterlist *sg_next(struct scatterlist *); struct scatterlist *sg_last(struct scatterlist *s, unsigned int); void sg_init_table(struct scatterlist *, unsigned int); void sg_init_one(struct scatterlist *, const void *, unsigned int); int sg_split(struct scatterlist *in, const int in_mapped_nents, const off_t skip, const int nb_splits, const size_t *split_sizes, struct scatterlist **out, int *out_mapped_nents, gfp_t gfp_mask); typedef struct scatterlist *(sg_alloc_fn)(unsigned int, gfp_t); typedef void (sg_free_fn)(struct scatterlist *, unsigned int); void __sg_free_table(struct sg_table *, unsigned int, unsigned int, sg_free_fn *); void sg_free_table(struct sg_table *); int __sg_alloc_table(struct sg_table *, unsigned int, unsigned int, struct scatterlist *, unsigned int, gfp_t, sg_alloc_fn *); int sg_alloc_table(struct sg_table *, unsigned int, gfp_t); struct scatterlist *__sg_alloc_table_from_pages(struct sg_table *sgt, struct page **pages, unsigned int n_pages, unsigned int offset, unsigned long size, unsigned int max_segment, struct scatterlist *prv, unsigned int left_pages, gfp_t gfp_mask); int sg_alloc_table_from_pages(struct sg_table *sgt, struct page **pages, unsigned int n_pages, unsigned int offset, unsigned long size, gfp_t gfp_mask); #ifdef CONFIG_SGL_ALLOC struct scatterlist *sgl_alloc_order(unsigned long long length, unsigned int order, bool chainable, gfp_t gfp, unsigned int *nent_p); struct scatterlist *sgl_alloc(unsigned long long length, gfp_t gfp, unsigned int *nent_p); void sgl_free_n_order(struct scatterlist *sgl, int nents, int order); void sgl_free_order(struct scatterlist *sgl, int order); void sgl_free(struct scatterlist *sgl); #endif /* CONFIG_SGL_ALLOC */ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, size_t buflen, off_t skip, bool to_buffer); size_t sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents, const void *buf, size_t buflen); size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, size_t buflen); size_t sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents, const void *buf, size_t buflen, off_t skip); size_t sg_pcopy_to_buffer(struct scatterlist *sgl, unsigned int nents, void *buf, size_t buflen, off_t skip); size_t sg_zero_buffer(struct scatterlist *sgl, unsigned int nents, size_t buflen, off_t skip); /* * Maximum number of entries that will be allocated in one piece, if * a list larger than this is required then chaining will be utilized. */ #define SG_MAX_SINGLE_ALLOC (PAGE_SIZE / sizeof(struct scatterlist)) /* * The maximum number of SG segments that we will put inside a * scatterlist (unless chaining is used). Should ideally fit inside a * single page, to avoid a higher order allocation. We could define this * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The * minimum value is 32 */ #define SG_CHUNK_SIZE 128 /* * Like SG_CHUNK_SIZE, but for archs that have sg chaining. This limit * is totally arbitrary, a setting of 2048 will get you at least 8mb ios. */ #ifdef CONFIG_ARCH_NO_SG_CHAIN #define SG_MAX_SEGMENTS SG_CHUNK_SIZE #else #define SG_MAX_SEGMENTS 2048 #endif #ifdef CONFIG_SG_POOL void sg_free_table_chained(struct sg_table *table, unsigned nents_first_chunk); int sg_alloc_table_chained(struct sg_table *table, int nents, struct scatterlist *first_chunk, unsigned nents_first_chunk); #endif /* * sg page iterator * * Iterates over sg entries page-by-page. On each successful iteration, you * can call sg_page_iter_page(@piter) to get the current page. * @piter->sg will point to the sg holding this page and @piter->sg_pgoffset to * the page's page offset within the sg. The iteration will stop either when a * maximum number of sg entries was reached or a terminating sg * (sg_last(sg) == true) was reached. */ struct sg_page_iter { struct scatterlist *sg; /* sg holding the page */ unsigned int sg_pgoffset; /* page offset within the sg */ /* these are internal states, keep away */ unsigned int __nents; /* remaining sg entries */ int __pg_advance; /* nr pages to advance at the * next step */ }; /* * sg page iterator for DMA addresses * * This is the same as sg_page_iter however you can call * sg_page_iter_dma_address(@dma_iter) to get the page's DMA * address. sg_page_iter_page() cannot be called on this iterator. */ struct sg_dma_page_iter { struct sg_page_iter base; }; bool __sg_page_iter_next(struct sg_page_iter *piter); bool __sg_page_iter_dma_next(struct sg_dma_page_iter *dma_iter); void __sg_page_iter_start(struct sg_page_iter *piter, struct scatterlist *sglist, unsigned int nents, unsigned long pgoffset); /** * sg_page_iter_page - get the current page held by the page iterator * @piter: page iterator holding the page */ static inline struct page *sg_page_iter_page(struct sg_page_iter *piter) { return nth_page(sg_page(piter->sg), piter->sg_pgoffset); } /** * sg_page_iter_dma_address - get the dma address of the current page held by * the page iterator. * @dma_iter: page iterator holding the page */ static inline dma_addr_t sg_page_iter_dma_address(struct sg_dma_page_iter *dma_iter) { return sg_dma_address(dma_iter->base.sg) + (dma_iter->base.sg_pgoffset << PAGE_SHIFT); } /** * for_each_sg_page - iterate over the pages of the given sg list * @sglist: sglist to iterate over * @piter: page iterator to hold current page, sg, sg_pgoffset * @nents: maximum number of sg entries to iterate over * @pgoffset: starting page offset (in pages) * * Callers may use sg_page_iter_page() to get each page pointer. * In each loop it operates on PAGE_SIZE unit. */ #define for_each_sg_page(sglist, piter, nents, pgoffset) \ for (__sg_page_iter_start((piter), (sglist), (nents), (pgoffset)); \ __sg_page_iter_next(piter);) /** * for_each_sg_dma_page - iterate over the pages of the given sg list * @sglist: sglist to iterate over * @dma_iter: DMA page iterator to hold current page * @dma_nents: maximum number of sg entries to iterate over, this is the value * returned from dma_map_sg * @pgoffset: starting page offset (in pages) * * Callers may use sg_page_iter_dma_address() to get each page's DMA address. * In each loop it operates on PAGE_SIZE unit. */ #define for_each_sg_dma_page(sglist, dma_iter, dma_nents, pgoffset) \ for (__sg_page_iter_start(&(dma_iter)->base, sglist, dma_nents, \ pgoffset); \ __sg_page_iter_dma_next(dma_iter);) /** * for_each_sgtable_page - iterate over all pages in the sg_table object * @sgt: sg_table object to iterate over * @piter: page iterator to hold current page * @pgoffset: starting page offset (in pages) * * Iterates over the all memory pages in the buffer described by * a scatterlist stored in the given sg_table object. * See also for_each_sg_page(). In each loop it operates on PAGE_SIZE unit. */ #define for_each_sgtable_page(sgt, piter, pgoffset) \ for_each_sg_page((sgt)->sgl, piter, (sgt)->orig_nents, pgoffset) /** * for_each_sgtable_dma_page - iterate over the DMA mapped sg_table object * @sgt: sg_table object to iterate over * @dma_iter: DMA page iterator to hold current page * @pgoffset: starting page offset (in pages) * * Iterates over the all DMA mapped pages in the buffer described by * a scatterlist stored in the given sg_table object. * See also for_each_sg_dma_page(). In each loop it operates on PAGE_SIZE * unit. */ #define for_each_sgtable_dma_page(sgt, dma_iter, pgoffset) \ for_each_sg_dma_page((sgt)->sgl, dma_iter, (sgt)->nents, pgoffset) /* * Mapping sg iterator * * Iterates over sg entries mapping page-by-page. On each successful * iteration, @miter->page points to the mapped page and * @miter->length bytes of data can be accessed at @miter->addr. As * long as an interation is enclosed between start and stop, the user * is free to choose control structure and when to stop. * * @miter->consumed is set to @miter->length on each iteration. It * can be adjusted if the user can't consume all the bytes in one go. * Also, a stopped iteration can be resumed by calling next on it. * This is useful when iteration needs to release all resources and * continue later (e.g. at the next interrupt). */ #define SG_MITER_ATOMIC (1 << 0) /* use kmap_atomic */ #define SG_MITER_TO_SG (1 << 1) /* flush back to phys on unmap */ #define SG_MITER_FROM_SG (1 << 2) /* nop */ struct sg_mapping_iter { /* the following three fields can be accessed directly */ struct page *page; /* currently mapped page */ void *addr; /* pointer to the mapped area */ size_t length; /* length of the mapped area */ size_t consumed; /* number of consumed bytes */ struct sg_page_iter piter; /* page iterator */ /* these are internal states, keep away */ unsigned int __offset; /* offset within page */ unsigned int __remaining; /* remaining bytes on page */ unsigned int __flags; }; void sg_miter_start(struct sg_mapping_iter *miter, struct scatterlist *sgl, unsigned int nents, unsigned int flags); bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset); bool sg_miter_next(struct sg_mapping_iter *miter); void sg_miter_stop(struct sg_mapping_iter *miter); #endif /* _LINUX_SCATTERLIST_H */
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 1 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 // SPDX-License-Identifier: GPL-2.0-only /* * linux/fs/file_table.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) */ #include <linux/string.h> #include <linux/slab.h> #include <linux/file.h> #include <linux/fdtable.h> #include <linux/init.h> #include <linux/module.h> #include <linux/fs.h> #include <linux/security.h> #include <linux/cred.h> #include <linux/eventpoll.h> #include <linux/rcupdate.h> #include <linux/mount.h> #include <linux/capability.h> #include <linux/cdev.h> #include <linux/fsnotify.h> #include <linux/sysctl.h> #include <linux/percpu_counter.h> #include <linux/percpu.h> #include <linux/task_work.h> #include <linux/ima.h> #include <linux/swap.h> #include <linux/atomic.h> #include "internal.h" /* sysctl tunables... */ struct files_stat_struct files_stat = { .max_files = NR_FILE }; /* SLAB cache for file structures */ static struct kmem_cache *filp_cachep __read_mostly; static struct percpu_counter nr_files __cacheline_aligned_in_smp; static void file_free_rcu(struct rcu_head *head) { struct file *f = container_of(head, struct file, f_u.fu_rcuhead); put_cred(f->f_cred); kmem_cache_free(filp_cachep, f); } static inline void file_free(struct file *f) { security_file_free(f); if (!(f->f_mode & FMODE_NOACCOUNT)) percpu_counter_dec(&nr_files); call_rcu(&f->f_u.fu_rcuhead, file_free_rcu); } /* * Return the total number of open files in the system */ static long get_nr_files(void) { return percpu_counter_read_positive(&nr_files); } /* * Return the maximum number of open files in the system */ unsigned long get_max_files(void) { return files_stat.max_files; } EXPORT_SYMBOL_GPL(get_max_files); /* * Handle nr_files sysctl */ #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS) int proc_nr_files(struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos) { files_stat.nr_files = get_nr_files(); return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); } #else int proc_nr_files(struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos) { return -ENOSYS; } #endif static struct file *__alloc_file(int flags, const struct cred *cred) { struct file *f; int error; f = kmem_cache_zalloc(filp_cachep, GFP_KERNEL); if (unlikely(!f)) return ERR_PTR(-ENOMEM); f->f_cred = get_cred(cred); error = security_file_alloc(f); if (unlikely(error)) { file_free_rcu(&f->f_u.fu_rcuhead); return ERR_PTR(error); } atomic_long_set(&f->f_count, 1); rwlock_init(&f->f_owner.lock); spin_lock_init(&f->f_lock); mutex_init(&f->f_pos_lock); eventpoll_init_file(f); f->f_flags = flags; f->f_mode = OPEN_FMODE(flags); /* f->f_version: 0 */ return f; } /* Find an unused file structure and return a pointer to it. * Returns an error pointer if some error happend e.g. we over file * structures limit, run out of memory or operation is not permitted. * * Be very careful using this. You are responsible for * getting write access to any mount that you might assign * to this filp, if it is opened for write. If this is not * done, you will imbalance int the mount's writer count * and a warning at __fput() time. */ struct file *alloc_empty_file(int flags, const struct cred *cred) { static long old_max; struct file *f; /* * Privileged users can go above max_files */ if (get_nr_files() >= files_stat.max_files && !capable(CAP_SYS_ADMIN)) { /* * percpu_counters are inaccurate. Do an expensive check before * we go and fail. */ if (percpu_counter_sum_positive(&nr_files) >= files_stat.max_files) goto over; } f = __alloc_file(flags, cred); if (!IS_ERR(f)) percpu_counter_inc(&nr_files); return f; over: /* Ran out of filps - report that */ if (get_nr_files() > old_max) { pr_info("VFS: file-max limit %lu reached\n", get_max_files()); old_max = get_nr_files(); } return ERR_PTR(-ENFILE); } /* * Variant of alloc_empty_file() that doesn't check and modify nr_files. * * Should not be used unless there's a very good reason to do so. */ struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred) { struct file *f = __alloc_file(flags, cred); if (!IS_ERR(f)) f->f_mode |= FMODE_NOACCOUNT; return f; } /** * alloc_file - allocate and initialize a 'struct file' * * @path: the (dentry, vfsmount) pair for the new file * @flags: O_... flags with which the new file will be opened * @fop: the 'struct file_operations' for the new file */ static struct file *alloc_file(const struct path *path, int flags, const struct file_operations *fop) { struct file *file; file = alloc_empty_file(flags, current_cred()); if (IS_ERR(file)) return file; file->f_path = *path; file->f_inode = path->dentry->d_inode; file->f_mapping = path->dentry->d_inode->i_mapping; file->f_wb_err = filemap_sample_wb_err(file->f_mapping); file->f_sb_err = file_sample_sb_err(file); if ((file->f_mode & FMODE_READ) && likely(fop->read || fop->read_iter)) file->f_mode |= FMODE_CAN_READ; if ((file->f_mode & FMODE_WRITE) && likely(fop->write || fop->write_iter)) file->f_mode |= FMODE_CAN_WRITE; file->f_mode |= FMODE_OPENED; file->f_op = fop; if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) i_readcount_inc(path->dentry->d_inode); return file; } struct file *alloc_file_pseudo(struct inode *inode, struct vfsmount *mnt, const char *name, int flags, const struct file_operations *fops) { static const struct dentry_operations anon_ops = { .d_dname = simple_dname }; struct qstr this = QSTR_INIT(name, strlen(name)); struct path path; struct file *file; path.dentry = d_alloc_pseudo(mnt->mnt_sb, &this); if (!path.dentry) return ERR_PTR(-ENOMEM); if (!mnt->mnt_sb->s_d_op) d_set_d_op(path.dentry, &anon_ops); path.mnt = mntget(mnt); d_instantiate(path.dentry, inode); file = alloc_file(&path, flags, fops); if (IS_ERR(file)) { ihold(inode); path_put(&path); } return file; } EXPORT_SYMBOL(alloc_file_pseudo); struct file *alloc_file_clone(struct file *base, int flags, const struct file_operations *fops) { struct file *f = alloc_file(&base->f_path, flags, fops); if (!IS_ERR(f)) { path_get(&f->f_path); f->f_mapping = base->f_mapping; } return f; } /* the real guts of fput() - releasing the last reference to file */ static void __fput(struct file *file) { struct dentry *dentry = file->f_path.dentry; struct vfsmount *mnt = file->f_path.mnt; struct inode *inode = file->f_inode; fmode_t mode = file->f_mode; if (unlikely(!(file->f_mode & FMODE_OPENED))) goto out; might_sleep(); fsnotify_close(file); /* * The function eventpoll_release() should be the first called * in the file cleanup chain. */ eventpoll_release(file); locks_remove_file(file); ima_file_free(file); if (unlikely(file->f_flags & FASYNC)) { if (file->f_op->fasync) file->f_op->fasync(-1, file, 0); } if (file->f_op->release) file->f_op->release(inode, file); if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL && !(mode & FMODE_PATH))) { cdev_put(inode->i_cdev); } fops_put(file->f_op); put_pid(file->f_owner.pid); if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) i_readcount_dec(inode); if (mode & FMODE_WRITER) { put_write_access(inode); __mnt_drop_write(mnt); } dput(dentry); if (unlikely(mode & FMODE_NEED_UNMOUNT)) dissolve_on_fput(mnt); mntput(mnt); out: file_free(file); } static LLIST_HEAD(delayed_fput_list); static void delayed_fput(struct work_struct *unused) { struct llist_node *node = llist_del_all(&delayed_fput_list); struct file *f, *t; llist_for_each_entry_safe(f, t, node, f_u.fu_llist) __fput(f); } static void ____fput(struct callback_head *work) { __fput(container_of(work, struct file, f_u.fu_rcuhead)); } /* * If kernel thread really needs to have the final fput() it has done * to complete, call this. The only user right now is the boot - we * *do* need to make sure our writes to binaries on initramfs has * not left us with opened struct file waiting for __fput() - execve() * won't work without that. Please, don't add more callers without * very good reasons; in particular, never call that with locks * held and never call that from a thread that might need to do * some work on any kind of umount. */ void flush_delayed_fput(void) { delayed_fput(NULL); } EXPORT_SYMBOL_GPL(flush_delayed_fput); static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput); void fput_many(struct file *file, unsigned int refs) { if (atomic_long_sub_and_test(refs, &file->f_count)) { struct task_struct *task = current; if (likely(!in_interrupt() && !(task->flags & PF_KTHREAD))) { init_task_work(&file->f_u.fu_rcuhead, ____fput); if (!task_work_add(task, &file->f_u.fu_rcuhead, TWA_RESUME)) return; /* * After this task has run exit_task_work(), * task_work_add() will fail. Fall through to delayed * fput to avoid leaking *file. */ } if (llist_add(&file->f_u.fu_llist, &delayed_fput_list)) schedule_delayed_work(&delayed_fput_work, 1); } } void fput(struct file *file) { fput_many(file, 1); } /* * synchronous analog of fput(); for kernel threads that might be needed * in some umount() (and thus can't use flush_delayed_fput() without * risking deadlocks), need to wait for completion of __fput() and know * for this specific struct file it won't involve anything that would * need them. Use only if you really need it - at the very least, * don't blindly convert fput() by kernel thread to that. */ void __fput_sync(struct file *file) { if (atomic_long_dec_and_test(&file->f_count)) { struct task_struct *task = current; BUG_ON(!(task->flags & PF_KTHREAD)); __fput(file); } } EXPORT_SYMBOL(fput); void __init files_init(void) { filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT, NULL); percpu_counter_init(&nr_files, 0, GFP_KERNEL); } /* * One file with associated inode and dcache is very roughly 1K. Per default * do not use more than 10% of our memory for files. */ void __init files_maxfiles_init(void) { unsigned long n; unsigned long nr_pages = totalram_pages(); unsigned long memreserve = (nr_pages - nr_free_pages()) * 3/2; memreserve = min(memreserve, nr_pages - 1); n = ((nr_pages - memreserve) * (PAGE_SIZE / 1024)) / 10; files_stat.max_files = max_t(unsigned long, n, NR_FILE); }
1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 // SPDX-License-Identifier: GPL-2.0 /* * device.h - generic, centralized driver model * * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> * Copyright (c) 2008-2009 Novell Inc. * * See Documentation/driver-api/driver-model/ for more information. */ #ifndef _DEVICE_H_ #define _DEVICE_H_ #include <linux/dev_printk.h> #include <linux/energy_model.h> #include <linux/ioport.h> #include <linux/kobject.h> #include <linux/klist.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/compiler.h> #include <linux/types.h> #include <linux/mutex.h> #include <linux/pm.h> #include <linux/atomic.h> #include <linux/uidgid.h> #include <linux/gfp.h> #include <linux/overflow.h> #include <linux/device/bus.h> #include <linux/device/class.h> #include <linux/device/driver.h> #include <asm/device.h> struct device; struct device_private; struct device_driver; struct driver_private; struct module; struct class; struct subsys_private; struct device_node; struct fwnode_handle; struct iommu_ops; struct iommu_group; struct dev_pin_info; struct dev_iommu; /** * struct subsys_interface - interfaces to device functions * @name: name of the device function * @subsys: subsytem of the devices to attach to * @node: the list of functions registered at the subsystem * @add_dev: device hookup to device function handler * @remove_dev: device hookup to device function handler * * Simple interfaces attached to a subsystem. Multiple interfaces can * attach to a subsystem and its devices. Unlike drivers, they do not * exclusively claim or control devices. Interfaces usually represent * a specific functionality of a subsystem/class of devices. */ struct subsys_interface { const char *name; struct bus_type *subsys; struct list_head node; int (*add_dev)(struct device *dev, struct subsys_interface *sif); void (*remove_dev)(struct device *dev, struct subsys_interface *sif); }; int subsys_interface_register(struct subsys_interface *sif); void subsys_interface_unregister(struct subsys_interface *sif); int subsys_system_register(struct bus_type *subsys, const struct attribute_group **groups); int subsys_virtual_register(struct bus_type *subsys, const struct attribute_group **groups); /* * The type of device, "struct device" is embedded in. A class * or bus can contain devices of different types * like "partitions" and "disks", "mouse" and "event". * This identifies the device type and carries type-specific * information, equivalent to the kobj_type of a kobject. * If "name" is specified, the uevent will contain it in * the DEVTYPE variable. */ struct device_type { const char *name; const struct attribute_group **groups; int (*uevent)(struct device *dev, struct kobj_uevent_env *env); char *(*devnode)(struct device *dev, umode_t *mode, kuid_t *uid, kgid_t *gid); void (*release)(struct device *dev); const struct dev_pm_ops *pm; }; /* interface for exporting device attributes */ struct device_attribute { struct attribute attr; ssize_t (*show)(struct device *dev, struct device_attribute *attr, char *buf); ssize_t (*store)(struct device *dev, struct device_attribute *attr, const char *buf, size_t count); }; struct dev_ext_attribute { struct device_attribute attr; void *var; }; ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr, char *buf); ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr, const char *buf, size_t count); ssize_t device_show_int(struct device *dev, struct device_attribute *attr, char *buf); ssize_t device_store_int(struct device *dev, struct device_attribute *attr, const char *buf, size_t count); ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, char *buf); ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, const char *buf, size_t count); #define DEVICE_ATTR(_name, _mode, _show, _store) \ struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store) #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \ struct device_attribute dev_attr_##_name = \ __ATTR_PREALLOC(_name, _mode, _show, _store) #define DEVICE_ATTR_RW(_name) \ struct device_attribute dev_attr_##_name = __ATTR_RW(_name) #define DEVICE_ATTR_ADMIN_RW(_name) \ struct device_attribute dev_attr_##_name = __ATTR_RW_MODE(_name, 0600) #define DEVICE_ATTR_RO(_name) \ struct device_attribute dev_attr_##_name = __ATTR_RO(_name) #define DEVICE_ATTR_ADMIN_RO(_name) \ struct device_attribute dev_attr_##_name = __ATTR_RO_MODE(_name, 0400) #define DEVICE_ATTR_WO(_name) \ struct device_attribute dev_attr_##_name = __ATTR_WO(_name) #define DEVICE_ULONG_ATTR(_name, _mode, _var) \ struct dev_ext_attribute dev_attr_##_name = \ { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) } #define DEVICE_INT_ATTR(_name, _mode, _var) \ struct dev_ext_attribute dev_attr_##_name = \ { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) } #define DEVICE_BOOL_ATTR(_name, _mode, _var) \ struct dev_ext_attribute dev_attr_##_name = \ { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) } #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \ struct device_attribute dev_attr_##_name = \ __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) int device_create_file(struct device *device, const struct device_attribute *entry); void device_remove_file(struct device *dev, const struct device_attribute *attr); bool device_remove_file_self(struct device *dev, const struct device_attribute *attr); int __must_check device_create_bin_file(struct device *dev, const struct bin_attribute *attr); void device_remove_bin_file(struct device *dev, const struct bin_attribute *attr); /* device resource management */ typedef void (*dr_release_t)(struct device *dev, void *res); typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data); #ifdef CONFIG_DEBUG_DEVRES void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, int nid, const char *name) __malloc; #define devres_alloc(release, size, gfp) \ __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release) #define devres_alloc_node(release, size, gfp, nid) \ __devres_alloc_node(release, size, gfp, nid, #release) #else void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, int nid) __malloc; static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp) { return devres_alloc_node(release, size, gfp, NUMA_NO_NODE); } #endif void devres_for_each_res(struct device *dev, dr_release_t release, dr_match_t match, void *match_data, void (*fn)(struct device *, void *, void *), void *data); void devres_free(void *res); void devres_add(struct device *dev, void *res); void *devres_find(struct device *dev, dr_release_t release, dr_match_t match, void *match_data); void *devres_get(struct device *dev, void *new_res, dr_match_t match, void *match_data); void *devres_remove(struct device *dev, dr_release_t release, dr_match_t match, void *match_data); int devres_destroy(struct device *dev, dr_release_t release, dr_match_t match, void *match_data); int devres_release(struct device *dev, dr_release_t release, dr_match_t match, void *match_data); /* devres group */ void * __must_check devres_open_group(struct device *dev, void *id, gfp_t gfp); void devres_close_group(struct device *dev, void *id); void devres_remove_group(struct device *dev, void *id); int devres_release_group(struct device *dev, void *id); /* managed devm_k.alloc/kfree for device drivers */ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc; void *devm_krealloc(struct device *dev, void *ptr, size_t size, gfp_t gfp) __must_check; __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt, va_list ap) __malloc; __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc; static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp) { return devm_kmalloc(dev, size, gfp | __GFP_ZERO); } static inline void *devm_kmalloc_array(struct device *dev, size_t n, size_t size, gfp_t flags) { size_t bytes; if (unlikely(check_mul_overflow(n, size, &bytes))) return NULL; return devm_kmalloc(dev, bytes, flags); } static inline void *devm_kcalloc(struct device *dev, size_t n, size_t size, gfp_t flags) { return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO); } void devm_kfree(struct device *dev, const void *p); char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc; const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp); void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp); unsigned long devm_get_free_pages(struct device *dev, gfp_t gfp_mask, unsigned int order); void devm_free_pages(struct device *dev, unsigned long addr); void __iomem *devm_ioremap_resource(struct device *dev, const struct resource *res); void __iomem *devm_ioremap_resource_wc(struct device *dev, const struct resource *res); void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index, resource_size_t *size); /* allows to add/remove a custom action to devres stack */ int devm_add_action(struct device *dev, void (*action)(void *), void *data); void devm_remove_action(struct device *dev, void (*action)(void *), void *data); void devm_release_action(struct device *dev, void (*action)(void *), void *data); static inline int devm_add_action_or_reset(struct device *dev, void (*action)(void *), void *data) { int ret; ret = devm_add_action(dev, action, data); if (ret) action(data); return ret; } /** * devm_alloc_percpu - Resource-managed alloc_percpu * @dev: Device to allocate per-cpu memory for * @type: Type to allocate per-cpu memory for * * Managed alloc_percpu. Per-cpu memory allocated with this function is * automatically freed on driver detach. * * RETURNS: * Pointer to allocated memory on success, NULL on failure. */ #define devm_alloc_percpu(dev, type) \ ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \ __alignof__(type))) void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, size_t align); void devm_free_percpu(struct device *dev, void __percpu *pdata); struct device_dma_parameters { /* * a low level driver may set these to teach IOMMU code about * sg limitations. */ unsigned int max_segment_size; unsigned int min_align_mask; unsigned long segment_boundary_mask; }; /** * enum device_link_state - Device link states. * @DL_STATE_NONE: The presence of the drivers is not being tracked. * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present. * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not. * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present). * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present. * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding. */ enum device_link_state { DL_STATE_NONE = -1, DL_STATE_DORMANT = 0, DL_STATE_AVAILABLE, DL_STATE_CONSUMER_PROBE, DL_STATE_ACTIVE, DL_STATE_SUPPLIER_UNBIND, }; /* * Device link flags. * * STATELESS: The core will not remove this link automatically. * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind. * PM_RUNTIME: If set, the runtime PM framework will use this link. * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation. * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind. * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds. * MANAGED: The core tracks presence of supplier/consumer drivers (internal). * SYNC_STATE_ONLY: Link only affects sync_state() behavior. */ #define DL_FLAG_STATELESS BIT(0) #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1) #define DL_FLAG_PM_RUNTIME BIT(2) #define DL_FLAG_RPM_ACTIVE BIT(3) #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4) #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5) #define DL_FLAG_MANAGED BIT(6) #define DL_FLAG_SYNC_STATE_ONLY BIT(7) /** * enum dl_dev_state - Device driver presence tracking information. * @DL_DEV_NO_DRIVER: There is no driver attached to the device. * @DL_DEV_PROBING: A driver is probing. * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device. * @DL_DEV_UNBINDING: The driver is unbinding from the device. */ enum dl_dev_state { DL_DEV_NO_DRIVER = 0, DL_DEV_PROBING, DL_DEV_DRIVER_BOUND, DL_DEV_UNBINDING, }; /** * struct dev_links_info - Device data related to device links. * @suppliers: List of links to supplier devices. * @consumers: List of links to consumer devices. * @needs_suppliers: Hook to global list of devices waiting for suppliers. * @defer_hook: Hook to global list of devices that have deferred sync_state or * deferred fw_devlink. * @need_for_probe: If needs_suppliers is on a list, this indicates if the * suppliers are needed for probe or not. * @status: Driver status information. */ struct dev_links_info { struct list_head suppliers; struct list_head consumers; struct list_head needs_suppliers; struct list_head defer_hook; bool need_for_probe; enum dl_dev_state status; }; /** * struct device - The basic device structure * @parent: The device's "parent" device, the device to which it is attached. * In most cases, a parent device is some sort of bus or host * controller. If parent is NULL, the device, is a top-level device, * which is not usually what you want. * @p: Holds the private data of the driver core portions of the device. * See the comment of the struct device_private for detail. * @kobj: A top-level, abstract class from which other classes are derived. * @init_name: Initial name of the device. * @type: The type of device. * This identifies the device type and carries type-specific * information. * @mutex: Mutex to synchronize calls to its driver. * @lockdep_mutex: An optional debug lock that a subsystem can use as a * peer lock to gain localized lockdep coverage of the device_lock. * @bus: Type of bus device is on. * @driver: Which driver has allocated this * @platform_data: Platform data specific to the device. * Example: For devices on custom boards, as typical of embedded * and SOC based hardware, Linux often uses platform_data to point * to board-specific structures describing devices and how they * are wired. That can include what ports are available, chip * variants, which GPIO pins act in what additional roles, and so * on. This shrinks the "Board Support Packages" (BSPs) and * minimizes board-specific #ifdefs in drivers. * @driver_data: Private pointer for driver specific info. * @links: Links to suppliers and consumers of this device. * @power: For device power management. * See Documentation/driver-api/pm/devices.rst for details. * @pm_domain: Provide callbacks that are executed during system suspend, * hibernation, system resume and during runtime PM transitions * along with subsystem-level and driver-level callbacks. * @em_pd: device's energy model performance domain * @pins: For device pin management. * See Documentation/driver-api/pinctl.rst for details. * @msi_list: Hosts MSI descriptors * @msi_domain: The generic MSI domain this device is using. * @numa_node: NUMA node this device is close to. * @dma_ops: DMA mapping operations for this device. * @dma_mask: Dma mask (if dma'ble device). * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all * hardware supports 64-bit addresses for consistent allocations * such descriptors. * @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller * DMA limit than the device itself supports. * @dma_range_map: map for DMA memory ranges relative to that of RAM * @dma_parms: A low level driver may set these to teach IOMMU code about * segment limitations. * @dma_pools: Dma pools (if dma'ble device). * @dma_mem: Internal for coherent mem override. * @cma_area: Contiguous memory area for dma allocations * @archdata: For arch-specific additions. * @of_node: Associated device tree node. * @fwnode: Associated device node supplied by platform firmware. * @devt: For creating the sysfs "dev". * @id: device instance * @devres_lock: Spinlock to protect the resource of the device. * @devres_head: The resources list of the device. * @knode_class: The node used to add the device to the class list. * @class: The class of the device. * @groups: Optional attribute groups. * @release: Callback to free the device after all references have * gone away. This should be set by the allocator of the * device (i.e. the bus driver that discovered the device). * @iommu_group: IOMMU group the device belongs to. * @iommu: Per device generic IOMMU runtime data * * @offline_disabled: If set, the device is permanently online. * @offline: Set after successful invocation of bus type's .offline(). * @of_node_reused: Set if the device-tree node is shared with an ancestor * device. * @state_synced: The hardware state of this device has been synced to match * the software state of this device by calling the driver/bus * sync_state() callback. * @dma_coherent: this particular device is dma coherent, even if the * architecture supports non-coherent devices. * @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the * streaming DMA operations (->map_* / ->unmap_* / ->sync_*), * and optionall (if the coherent mask is large enough) also * for dma allocations. This flag is managed by the dma ops * instance from ->dma_supported. * * At the lowest level, every device in a Linux system is represented by an * instance of struct device. The device structure contains the information * that the device model core needs to model the system. Most subsystems, * however, track additional information about the devices they host. As a * result, it is rare for devices to be represented by bare device structures; * instead, that structure, like kobject structures, is usually embedded within * a higher-level representation of the device. */ struct device { struct kobject kobj; struct device *parent; struct device_private *p; const char *init_name; /* initial name of the device */ const struct device_type *type; struct bus_type *bus; /* type of bus device is on */ struct device_driver *driver; /* which driver has allocated this device */ void *platform_data; /* Platform specific data, device core doesn't touch it */ void *driver_data; /* Driver data, set and get with dev_set_drvdata/dev_get_drvdata */ #ifdef CONFIG_PROVE_LOCKING struct mutex lockdep_mutex; #endif struct mutex mutex; /* mutex to synchronize calls to * its driver. */ struct dev_links_info links; struct dev_pm_info power; struct dev_pm_domain *pm_domain; #ifdef CONFIG_ENERGY_MODEL struct em_perf_domain *em_pd; #endif #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN struct irq_domain *msi_domain; #endif #ifdef CONFIG_PINCTRL struct dev_pin_info *pins; #endif #ifdef CONFIG_GENERIC_MSI_IRQ raw_spinlock_t msi_lock; struct list_head msi_list; #endif #ifdef CONFIG_DMA_OPS const struct dma_map_ops *dma_ops; #endif u64 *dma_mask; /* dma mask (if dma'able device) */ u64 coherent_dma_mask;/* Like dma_mask, but for alloc_coherent mappings as not all hardware supports 64 bit addresses for consistent allocations such descriptors. */ u64 bus_dma_limit; /* upstream dma constraint */ const struct bus_dma_region *dma_range_map; struct device_dma_parameters *dma_parms; struct list_head dma_pools; /* dma pools (if dma'ble) */ #ifdef CONFIG_DMA_DECLARE_COHERENT struct dma_coherent_mem *dma_mem; /* internal for coherent mem override */ #endif #ifdef CONFIG_DMA_CMA struct cma *cma_area; /* contiguous memory area for dma allocations */ #endif /* arch specific additions */ struct dev_archdata archdata; struct device_node *of_node; /* associated device tree node */ struct fwnode_handle *fwnode; /* firmware device node */ #ifdef CONFIG_NUMA int numa_node; /* NUMA node this device is close to */ #endif dev_t devt; /* dev_t, creates the sysfs "dev" */ u32 id; /* device instance */ spinlock_t devres_lock; struct list_head devres_head; struct class *class; const struct attribute_group **groups; /* optional groups */ void (*release)(struct device *dev); struct iommu_group *iommu_group; struct dev_iommu *iommu; bool offline_disabled:1; bool offline:1; bool of_node_reused:1; bool state_synced:1; #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) bool dma_coherent:1; #endif #ifdef CONFIG_DMA_OPS_BYPASS bool dma_ops_bypass : 1; #endif }; /** * struct device_link - Device link representation. * @supplier: The device on the supplier end of the link. * @s_node: Hook to the supplier device's list of links to consumers. * @consumer: The device on the consumer end of the link. * @c_node: Hook to the consumer device's list of links to suppliers. * @link_dev: device used to expose link details in sysfs * @status: The state of the link (with respect to the presence of drivers). * @flags: Link flags. * @rpm_active: Whether or not the consumer device is runtime-PM-active. * @kref: Count repeated addition of the same link. * @rm_work: Work structure used for removing the link. * @supplier_preactivated: Supplier has been made active before consumer probe. */ struct device_link { struct device *supplier; struct list_head s_node; struct device *consumer; struct list_head c_node; struct device link_dev; enum device_link_state status; u32 flags; refcount_t rpm_active; struct kref kref; struct work_struct rm_work; bool supplier_preactivated; /* Owned by consumer probe. */ }; static inline struct device *kobj_to_dev(struct kobject *kobj) { return container_of(kobj, struct device, kobj); } /** * device_iommu_mapped - Returns true when the device DMA is translated * by an IOMMU * @dev: Device to perform the check on */ static inline bool device_iommu_mapped(struct device *dev) { return (dev->iommu_group != NULL); } /* Get the wakeup routines, which depend on struct device */ #include <linux/pm_wakeup.h> static inline const char *dev_name(const struct device *dev) { /* Use the init name until the kobject becomes available */ if (dev->init_name) return dev->init_name; return kobject_name(&dev->kobj); } /** * dev_bus_name - Return a device's bus/class name, if at all possible * @dev: struct device to get the bus/class name of * * Will return the name of the bus/class the device is attached to. If it is * not attached to a bus/class, an empty string will be returned. */ static inline const char *dev_bus_name(const struct device *dev) { return dev->bus ? dev->bus->name : (dev->class ? dev->class->name : ""); } __printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...); #ifdef CONFIG_NUMA static inline int dev_to_node(struct device *dev) { return dev->numa_node; } static inline void set_dev_node(struct device *dev, int node) { dev->numa_node = node; } #else static inline int dev_to_node(struct device *dev) { return NUMA_NO_NODE; } static inline void set_dev_node(struct device *dev, int node) { } #endif static inline struct irq_domain *dev_get_msi_domain(const struct device *dev) { #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN return dev->msi_domain; #else return NULL; #endif } static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d) { #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN dev->msi_domain = d; #endif } static inline void *dev_get_drvdata(const struct device *dev) { return dev->driver_data; } static inline void dev_set_drvdata(struct device *dev, void *data) { dev->driver_data = data; } static inline struct pm_subsys_data *dev_to_psd(struct device *dev) { return dev ? dev->power.subsys_data : NULL; } static inline unsigned int dev_get_uevent_suppress(const struct device *dev) { return dev->kobj.uevent_suppress; } static inline void dev_set_uevent_suppress(struct device *dev, int val) { dev->kobj.uevent_suppress = val; } static inline int device_is_registered(struct device *dev) { return dev->kobj.state_in_sysfs; } static inline void device_enable_async_suspend(struct device *dev) { if (!dev->power.is_prepared) dev->power.async_suspend = true; } static inline void device_disable_async_suspend(struct device *dev) { if (!dev->power.is_prepared) dev->power.async_suspend = false; } static inline bool device_async_suspend_enabled(struct device *dev) { return !!dev->power.async_suspend; } static inline bool device_pm_not_required(struct device *dev) { return dev->power.no_pm; } static inline void device_set_pm_not_required(struct device *dev) { dev->power.no_pm = true; } static inline void dev_pm_syscore_device(struct device *dev, bool val) { #ifdef CONFIG_PM_SLEEP dev->power.syscore = val; #endif } static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags) { dev->power.driver_flags = flags; } static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags) { return !!(dev->power.driver_flags & flags); } static inline void device_lock(struct device *dev) { mutex_lock(&dev->mutex); } static inline int device_lock_interruptible(struct device *dev) { return mutex_lock_interruptible(&dev->mutex); } static inline int device_trylock(struct device *dev) { return mutex_trylock(&dev->mutex); } static inline void device_unlock(struct device *dev) { mutex_unlock(&dev->mutex); } static inline void device_lock_assert(struct device *dev) { lockdep_assert_held(&dev->mutex); } static inline struct device_node *dev_of_node(struct device *dev) { if (!IS_ENABLED(CONFIG_OF) || !dev) return NULL; return dev->of_node; } static inline bool dev_has_sync_state(struct device *dev) { if (!dev) return false; if (dev->driver && dev->driver->sync_state) return true; if (dev->bus && dev->bus->sync_state) return true; return false; } /* * High level routines for use by the bus drivers */ int __must_check device_register(struct device *dev); void device_unregister(struct device *dev); void device_initialize(struct device *dev); int __must_check device_add(struct device *dev); void device_del(struct device *dev); int device_for_each_child(struct device *dev, void *data, int (*fn)(struct device *dev, void *data)); int device_for_each_child_reverse(struct device *dev, void *data, int (*fn)(struct device *dev, void *data)); struct device *device_find_child(struct device *dev, void *data, int (*match)(struct device *dev, void *data)); struct device *device_find_child_by_name(struct device *parent, const char *name); int device_rename(struct device *dev, const char *new_name); int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order); int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid); const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid, kgid_t *gid, const char **tmp); int device_is_dependent(struct device *dev, void *target); static inline bool device_supports_offline(struct device *dev) { return dev->bus && dev->bus->offline && dev->bus->online; } void lock_device_hotplug(void); void unlock_device_hotplug(void); int lock_device_hotplug_sysfs(void); int device_offline(struct device *dev); int device_online(struct device *dev); void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode); void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode); void device_set_of_node_from_dev(struct device *dev, const struct device *dev2); static inline int dev_num_vf(struct device *dev) { if (dev->bus && dev->bus->num_vf) return dev->bus->num_vf(dev); return 0; } /* * Root device objects for grouping under /sys/devices */ struct device *__root_device_register(const char *name, struct module *owner); /* This is a macro to avoid include problems with THIS_MODULE */ #define root_device_register(name) \ __root_device_register(name, THIS_MODULE) void root_device_unregister(struct device *root); static inline void *dev_get_platdata(const struct device *dev) { return dev->platform_data; } /* * Manual binding of a device to driver. See drivers/base/bus.c * for information on use. */ int __must_check device_bind_driver(struct device *dev); void device_release_driver(struct device *dev); int __must_check device_attach(struct device *dev); int __must_check driver_attach(struct device_driver *drv); void device_initial_probe(struct device *dev); int __must_check device_reprobe(struct device *dev); bool device_is_bound(struct device *dev); /* * Easy functions for dynamically creating devices on the fly */ __printf(5, 6) struct device * device_create(struct class *cls, struct device *parent, dev_t devt, void *drvdata, const char *fmt, ...); __printf(6, 7) struct device * device_create_with_groups(struct class *cls, struct device *parent, dev_t devt, void *drvdata, const struct attribute_group **groups, const char *fmt, ...); void device_destroy(struct class *cls, dev_t devt); int __must_check device_add_groups(struct device *dev, const struct attribute_group **groups); void device_remove_groups(struct device *dev, const struct attribute_group **groups); static inline int __must_check device_add_group(struct device *dev, const struct attribute_group *grp) { const struct attribute_group *groups[] = { grp, NULL }; return device_add_groups(dev, groups); } static inline void device_remove_group(struct device *dev, const struct attribute_group *grp) { const struct attribute_group *groups[] = { grp, NULL }; return device_remove_groups(dev, groups); } int __must_check devm_device_add_groups(struct device *dev, const struct attribute_group **groups); void devm_device_remove_groups(struct device *dev, const struct attribute_group **groups); int __must_check devm_device_add_group(struct device *dev, const struct attribute_group *grp); void devm_device_remove_group(struct device *dev, const struct attribute_group *grp); /* * Platform "fixup" functions - allow the platform to have their say * about devices and actions that the general device layer doesn't * know about. */ /* Notify platform of device discovery */ extern int (*platform_notify)(struct device *dev); extern int (*platform_notify_remove)(struct device *dev); /* * get_device - atomically increment the reference count for the device. * */ struct device *get_device(struct device *dev); void put_device(struct device *dev); bool kill_device(struct device *dev); #ifdef CONFIG_DEVTMPFS int devtmpfs_mount(void); #else static inline int devtmpfs_mount(void) { return 0; } #endif /* drivers/base/power/shutdown.c */ void device_shutdown(void); /* debugging and troubleshooting/diagnostic helpers. */ const char *dev_driver_string(const struct device *dev); /* Device links interface. */ struct device_link *device_link_add(struct device *consumer, struct device *supplier, u32 flags); void device_link_del(struct device_link *link); void device_link_remove(void *consumer, struct device *supplier); void device_links_supplier_sync_state_pause(void); void device_links_supplier_sync_state_resume(void); extern __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...); /* Create alias, so I can be autoloaded. */ #define MODULE_ALIAS_CHARDEV(major,minor) \ MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) #define MODULE_ALIAS_CHARDEV_MAJOR(major) \ MODULE_ALIAS("char-major-" __stringify(major) "-*") #ifdef CONFIG_SYSFS_DEPRECATED extern long sysfs_deprecated; #else #define sysfs_deprecated 0 #endif #endif /* _DEVICE_H_ */
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 #undef TRACE_SYSTEM #define TRACE_SYSTEM qdisc #if !defined(_TRACE_QDISC_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_QDISC_H #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/tracepoint.h> #include <linux/ftrace.h> #include <linux/pkt_sched.h> #include <net/sch_generic.h> TRACE_EVENT(qdisc_dequeue, TP_PROTO(struct Qdisc *qdisc, const struct netdev_queue *txq, int packets, struct sk_buff *skb), TP_ARGS(qdisc, txq, packets, skb), TP_STRUCT__entry( __field( struct Qdisc *, qdisc ) __field(const struct netdev_queue *, txq ) __field( int, packets ) __field( void *, skbaddr ) __field( int, ifindex ) __field( u32, handle ) __field( u32, parent ) __field( unsigned long, txq_state) ), /* skb==NULL indicate packets dequeued was 0, even when packets==1 */ TP_fast_assign( __entry->qdisc = qdisc; __entry->txq = txq; __entry->packets = skb ? packets : 0; __entry->skbaddr = skb; __entry->ifindex = txq->dev ? txq->dev->ifindex : 0; __entry->handle = qdisc->handle; __entry->parent = qdisc->parent; __entry->txq_state = txq->state; ), TP_printk("dequeue ifindex=%d qdisc handle=0x%X parent=0x%X txq_state=0x%lX packets=%d skbaddr=%p", __entry->ifindex, __entry->handle, __entry->parent, __entry->txq_state, __entry->packets, __entry->skbaddr ) ); TRACE_EVENT(qdisc_reset, TP_PROTO(struct Qdisc *q), TP_ARGS(q), TP_STRUCT__entry( __string( dev, qdisc_dev(q) ) __string( kind, q->ops->id ) __field( u32, parent ) __field( u32, handle ) ), TP_fast_assign( __assign_str(dev, qdisc_dev(q)); __assign_str(kind, q->ops->id); __entry->parent = q->parent; __entry->handle = q->handle; ), TP_printk("dev=%s kind=%s parent=%x:%x handle=%x:%x", __get_str(dev), __get_str(kind), TC_H_MAJ(__entry->parent) >> 16, TC_H_MIN(__entry->parent), TC_H_MAJ(__entry->handle) >> 16, TC_H_MIN(__entry->handle)) ); TRACE_EVENT(qdisc_destroy, TP_PROTO(struct Qdisc *q), TP_ARGS(q), TP_STRUCT__entry( __string( dev, qdisc_dev(q) ) __string( kind, q->ops->id ) __field( u32, parent ) __field( u32, handle ) ), TP_fast_assign( __assign_str(dev, qdisc_dev(q)); __assign_str(kind, q->ops->id); __entry->parent = q->parent; __entry->handle = q->handle; ), TP_printk("dev=%s kind=%s parent=%x:%x handle=%x:%x", __get_str(dev), __get_str(kind), TC_H_MAJ(__entry->parent) >> 16, TC_H_MIN(__entry->parent), TC_H_MAJ(__entry->handle) >> 16, TC_H_MIN(__entry->handle)) ); TRACE_EVENT(qdisc_create, TP_PROTO(const struct Qdisc_ops *ops, struct net_device *dev, u32 parent), TP_ARGS(ops, dev, parent), TP_STRUCT__entry( __string( dev, dev->name ) __string( kind, ops->id ) __field( u32, parent ) ), TP_fast_assign( __assign_str(dev, dev->name); __assign_str(kind, ops->id); __entry->parent = parent; ), TP_printk("dev=%s kind=%s parent=%x:%x", __get_str(dev), __get_str(kind), TC_H_MAJ(__entry->parent) >> 16, TC_H_MIN(__entry->parent)) ); #endif /* _TRACE_QDISC_H */ /* This part must be outside protection */ #include <trace/define_trace.h>
4 1 2 3 4 5 6 7 8 9 10 11 /* SPDX-License-Identifier: GPL-2.0 */ #include <asm/processor.h> static inline int phys_addr_valid(resource_size_t addr) { #ifdef CONFIG_PHYS_ADDR_T_64BIT return !(addr >> boot_cpu_data.x86_phys_bits); #else return 1; #endif }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 /* SPDX-License-Identifier: GPL-2.0 */ /* * Common values for AES algorithms */ #ifndef _CRYPTO_AES_H #define _CRYPTO_AES_H #include <linux/types.h> #include <linux/crypto.h> #define AES_MIN_KEY_SIZE 16 #define AES_MAX_KEY_SIZE 32 #define AES_KEYSIZE_128 16 #define AES_KEYSIZE_192 24 #define AES_KEYSIZE_256 32 #define AES_BLOCK_SIZE 16 #define AES_MAX_KEYLENGTH (15 * 16) #define AES_MAX_KEYLENGTH_U32 (AES_MAX_KEYLENGTH / sizeof(u32)) /* * Please ensure that the first two fields are 16-byte aligned * relative to the start of the structure, i.e., don't move them! */ struct crypto_aes_ctx { u32 key_enc[AES_MAX_KEYLENGTH_U32]; u32 key_dec[AES_MAX_KEYLENGTH_U32]; u32 key_length; }; extern const u32 crypto_ft_tab[4][256] ____cacheline_aligned; extern const u32 crypto_it_tab[4][256] ____cacheline_aligned; /* * validate key length for AES algorithms */ static inline int aes_check_keylen(unsigned int keylen) { switch (keylen) { case AES_KEYSIZE_128: case AES_KEYSIZE_192: case AES_KEYSIZE_256: break; default: return -EINVAL; } return 0; } int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len); /** * aes_expandkey - Expands the AES key as described in FIPS-197 * @ctx: The location where the computed key will be stored. * @in_key: The supplied key. * @key_len: The length of the supplied key. * * Returns 0 on success. The function fails only if an invalid key size (or * pointer) is supplied. * The expanded key size is 240 bytes (max of 14 rounds with a unique 16 bytes * key schedule plus a 16 bytes key which is used before the first round). * The decryption key is prepared for the "Equivalent Inverse Cipher" as * described in FIPS-197. The first slot (16 bytes) of each key (enc or dec) is * for the initial combination, the second slot for the first round and so on. */ int aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key, unsigned int key_len); /** * aes_encrypt - Encrypt a single AES block * @ctx: Context struct containing the key schedule * @out: Buffer to store the ciphertext * @in: Buffer containing the plaintext */ void aes_encrypt(const struct crypto_aes_ctx *ctx, u8 *out, const u8 *in); /** * aes_decrypt - Decrypt a single AES block * @ctx: Context struct containing the key schedule * @out: Buffer to store the plaintext * @in: Buffer containing the ciphertext */ void aes_decrypt(const struct crypto_aes_ctx *ctx, u8 *out, const u8 *in); extern const u8 crypto_aes_sbox[]; extern const u8 crypto_aes_inv_sbox[]; #endif
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struct nfs_string; struct nfs_pageio_descriptor; static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) { if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; } static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) { if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) return 0; return 1; } static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry) { if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL)) return false; if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size) return false; return true; } /* * Note: RFC 1813 doesn't limit the number of auth flavors that * a server can return, so make something up. */ #define NFS_MAX_SECFLAVORS (12) /* * Value used if the user did not specify a port value. */ #define NFS_UNSPEC_PORT (-1) #define NFS_UNSPEC_RETRANS (UINT_MAX) #define NFS_UNSPEC_TIMEO (UINT_MAX) /* * Maximum number of pages that readdir can use for creating * a vmapped array of pages. */ #define NFS_MAX_READDIR_PAGES 8 struct nfs_client_initdata { unsigned long init_flags; const char *hostname; /* Hostname of the server */ const struct sockaddr *addr; /* Address of the server */ const char *nodename; /* Hostname of the client */ const char *ip_addr; /* IP address of the client */ size_t addrlen; struct nfs_subversion *nfs_mod; int proto; u32 minorversion; unsigned int nconnect; struct net *net; const struct rpc_timeout *timeparms; const struct cred *cred; }; /* * In-kernel mount arguments */ struct nfs_fs_context { bool internal; bool skip_reconfig_option_check; bool need_mount; bool sloppy; unsigned int flags; /* NFS{,4}_MOUNT_* flags */ unsigned int rsize, wsize; unsigned int timeo, retrans; unsigned int acregmin, acregmax; unsigned int acdirmin, acdirmax; unsigned int namlen; unsigned int options; unsigned int bsize; struct nfs_auth_info auth_info; rpc_authflavor_t selected_flavor; char *client_address; unsigned int version; unsigned int minorversion; char *fscache_uniq; unsigned short protofamily; unsigned short mountfamily; struct { union { struct sockaddr address; struct sockaddr_storage _address; }; size_t addrlen; char *hostname; u32 version; int port; unsigned short protocol; } mount_server; struct { union { struct sockaddr address; struct sockaddr_storage _address; }; size_t addrlen; char *hostname; char *export_path; int port; unsigned short protocol; unsigned short nconnect; unsigned short export_path_len; } nfs_server; struct nfs_fh *mntfh; struct nfs_server *server; struct nfs_subversion *nfs_mod; /* Information for a cloned mount. */ struct nfs_clone_mount { struct super_block *sb; struct dentry *dentry; struct nfs_fattr *fattr; unsigned int inherited_bsize; } clone_data; }; #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \ errorf(fc, fmt, ## __VA_ARGS__) : \ ({ dprintk(fmt "\n", ## __VA_ARGS__); })) #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \ errorf(fc, fmt, ## __VA_ARGS__) : \ ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \ invalf(fc, fmt, ## __VA_ARGS__) : \ ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; })) #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \ invalf(fc, fmt, ## __VA_ARGS__) : \ ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; })) #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \ warnf(fc, fmt, ## __VA_ARGS__) : \ ({ dprintk(fmt "\n", ## __VA_ARGS__); })) #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \ warnf(fc, fmt, ## __VA_ARGS__) : \ ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) { return fc->fs_private; } /* mount_clnt.c */ struct nfs_mount_request { struct sockaddr *sap; size_t salen; char *hostname; char *dirpath; u32 version; unsigned short protocol; struct nfs_fh *fh; int noresvport; unsigned int *auth_flav_len; rpc_authflavor_t *auth_flavs; struct net *net; }; extern int nfs_mount(struct nfs_mount_request *info); extern void nfs_umount(const struct nfs_mount_request *info); /* client.c */ extern const struct rpc_program nfs_program; extern void nfs_clients_init(struct net *net); extern void nfs_clients_exit(struct net *net); extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); void nfs_server_insert_lists(struct nfs_server *); void nfs_server_remove_lists(struct nfs_server *); void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, rpc_authflavor_t); struct nfs_server *nfs_alloc_server(void); void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); extern void nfs_put_client(struct nfs_client *); extern void nfs_free_client(struct nfs_client *); extern struct nfs_client *nfs4_find_client_ident(struct net *, int); extern struct nfs_client * nfs4_find_client_sessionid(struct net *, const struct sockaddr *, struct nfs4_sessionid *, u32); extern struct nfs_server *nfs_create_server(struct fs_context *); extern struct nfs_server *nfs4_create_server(struct fs_context *); extern struct nfs_server *nfs4_create_referral_server(struct fs_context *); extern int nfs4_update_server(struct nfs_server *server, const char *hostname, struct sockaddr *sap, size_t salen, struct net *net); extern void nfs_free_server(struct nfs_server *server); extern struct nfs_server *nfs_clone_server(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, rpc_authflavor_t); extern bool nfs_client_init_is_complete(const struct nfs_client *clp); extern int nfs_client_init_status(const struct nfs_client *clp); extern int nfs_wait_client_init_complete(const struct nfs_client *clp); extern void nfs_mark_client_ready(struct nfs_client *clp, int state); extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, const struct sockaddr *ds_addr, int ds_addrlen, int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, u32 minor_version); extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, struct inode *); extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, const struct sockaddr *ds_addr, int ds_addrlen, int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans); #ifdef CONFIG_PROC_FS extern int __init nfs_fs_proc_init(void); extern void nfs_fs_proc_exit(void); extern int nfs_fs_proc_net_init(struct net *net); extern void nfs_fs_proc_net_exit(struct net *net); #else static inline int nfs_fs_proc_net_init(struct net *net) { return 0; } static inline void nfs_fs_proc_net_exit(struct net *net) { } static inline int nfs_fs_proc_init(void) { return 0; } static inline void nfs_fs_proc_exit(void) { } #endif /* callback_xdr.c */ extern const struct svc_version nfs4_callback_version1; extern const struct svc_version nfs4_callback_version4; /* fs_context.c */ extern struct file_system_type nfs_fs_type; /* pagelist.c */ extern int __init nfs_init_nfspagecache(void); extern void nfs_destroy_nfspagecache(void); extern int __init nfs_init_readpagecache(void); extern void nfs_destroy_readpagecache(void); extern int __init nfs_init_writepagecache(void); extern void nfs_destroy_writepagecache(void); extern int __init nfs_init_directcache(void); extern void nfs_destroy_directcache(void); extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr, void (*release)(struct nfs_pgio_header *hdr)); void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); extern const struct nfs_pageio_ops nfs_pgio_rw_ops; struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); void nfs_pgio_header_free(struct nfs_pgio_header *); int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, const struct rpc_call_ops *call_ops, int how, int flags); void nfs_free_request(struct nfs_page *req); struct nfs_pgio_mirror * nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, const struct nfs_open_context *ctx2) { return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; } /* nfs2xdr.c */ extern const struct rpc_procinfo nfs_procedures[]; extern int nfs2_decode_dirent(struct xdr_stream *, struct nfs_entry *, bool); /* nfs3xdr.c */ extern const struct rpc_procinfo nfs3_procedures[]; extern int nfs3_decode_dirent(struct xdr_stream *, struct nfs_entry *, bool); /* nfs4xdr.c */ #if IS_ENABLED(CONFIG_NFS_V4) extern int nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *, bool); #endif #ifdef CONFIG_NFS_V4_1 extern const u32 nfs41_maxread_overhead; extern const u32 nfs41_maxwrite_overhead; extern const u32 nfs41_maxgetdevinfo_overhead; #endif /* nfs4proc.c */ #if IS_ENABLED(CONFIG_NFS_V4) extern const struct rpc_procinfo nfs4_procedures[]; #endif #ifdef CONFIG_NFS_V4_SECURITY_LABEL extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); static inline struct nfs4_label * nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) { if (!dst || !src) return NULL; if (src->len > NFS4_MAXLABELLEN) return NULL; dst->lfs = src->lfs; dst->pi = src->pi; dst->len = src->len; memcpy(dst->label, src->label, src->len); return dst; } static inline void nfs4_label_free(struct nfs4_label *label) { if (label) { kfree(label->label); kfree(label); } return; } static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) { if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) nfsi->cache_validity |= NFS_INO_INVALID_LABEL; } #else static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } static inline void nfs4_label_free(void *label) {} static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) { } static inline struct nfs4_label * nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) { return NULL; } #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ /* proc.c */ void nfs_close_context(struct nfs_open_context *ctx, int is_sync); extern struct nfs_client *nfs_init_client(struct nfs_client *clp, const struct nfs_client_initdata *); /* dir.c */ extern void nfs_advise_use_readdirplus(struct inode *dir); extern void nfs_force_use_readdirplus(struct inode *dir); extern unsigned long nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc); extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc); struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); int nfs_create(struct inode *, struct dentry *, umode_t, bool); int nfs_mkdir(struct inode *, struct dentry *, umode_t); int nfs_rmdir(struct inode *, struct dentry *); int nfs_unlink(struct inode *, struct dentry *); int nfs_symlink(struct inode *, struct dentry *, const char *); int nfs_link(struct dentry *, struct inode *, struct dentry *); int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, unsigned int); /* file.c */ int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); loff_t nfs_file_llseek(struct file *, loff_t, int); ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); int nfs_file_mmap(struct file *, struct vm_area_struct *); ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); int nfs_file_release(struct inode *, struct file *); int nfs_lock(struct file *, int, struct file_lock *); int nfs_flock(struct file *, int, struct file_lock *); int nfs_check_flags(int); /* inode.c */ extern struct workqueue_struct *nfsiod_workqueue; extern struct inode *nfs_alloc_inode(struct super_block *sb); extern void nfs_free_inode(struct inode *); extern int nfs_write_inode(struct inode *, struct writeback_control *); extern int nfs_drop_inode(struct inode *); extern void nfs_clear_inode(struct inode *); extern void nfs_evict_inode(struct inode *); void nfs_zap_acl_cache(struct inode *inode); extern bool nfs_check_cache_invalid(struct inode *, unsigned long); extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); /* super.c */ extern const struct super_operations nfs_sops; bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); int nfs_try_get_tree(struct fs_context *); int nfs_get_tree_common(struct fs_context *); void nfs_kill_super(struct super_block *); extern struct rpc_stat nfs_rpcstat; extern int __init register_nfs_fs(void); extern void __exit unregister_nfs_fs(void); extern bool nfs_sb_active(struct super_block *sb); extern void nfs_sb_deactive(struct super_block *sb); extern int nfs_client_for_each_server(struct nfs_client *clp, int (*fn)(struct nfs_server *, void *), void *data); /* io.c */ extern void nfs_start_io_read(struct inode *inode); extern void nfs_end_io_read(struct inode *inode); extern void nfs_start_io_write(struct inode *inode); extern void nfs_end_io_write(struct inode *inode); extern void nfs_start_io_direct(struct inode *inode); extern void nfs_end_io_direct(struct inode *inode); static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) { return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; } /* namespace.c */ #define NFS_PATH_CANONICAL 1 extern char *nfs_path(char **p, struct dentry *dentry, char *buffer, ssize_t buflen, unsigned flags); extern struct vfsmount *nfs_d_automount(struct path *path); int nfs_submount(struct fs_context *, struct nfs_server *); int nfs_do_submount(struct fs_context *); /* getroot.c */ extern int nfs_get_root(struct super_block *s, struct fs_context *fc); #if IS_ENABLED(CONFIG_NFS_V4) extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); #endif struct nfs_pgio_completion_ops; /* read.c */ extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode, bool force_mds, const struct nfs_pgio_completion_ops *compl_ops); extern void nfs_read_prepare(struct rpc_task *task, void *calldata); extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); /* super.c */ void nfs_umount_begin(struct super_block *); int nfs_statfs(struct dentry *, struct kstatfs *); int nfs_show_options(struct seq_file *, struct dentry *); int nfs_show_devname(struct seq_file *, struct dentry *); int nfs_show_path(struct seq_file *, struct dentry *); int nfs_show_stats(struct seq_file *, struct dentry *); int nfs_reconfigure(struct fs_context *); /* write.c */ extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags, bool force_mds, const struct nfs_pgio_completion_ops *compl_ops); extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); extern void nfs_commit_free(struct nfs_commit_data *p); extern void nfs_write_prepare(struct rpc_task *task, void *calldata); extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); extern int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, const struct nfs_rpc_ops *nfs_ops, const struct rpc_call_ops *call_ops, int how, int flags); extern void nfs_init_commit(struct nfs_commit_data *data, struct list_head *head, struct pnfs_layout_segment *lseg, struct nfs_commit_info *cinfo); int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, struct nfs_commit_info *cinfo, int max); unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); int nfs_scan_commit(struct inode *inode, struct list_head *dst, struct nfs_commit_info *cinfo); void nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, struct nfs_commit_info *cinfo, u32 ds_commit_idx); int nfs_write_need_commit(struct nfs_pgio_header *); void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); int nfs_generic_commit_list(struct inode *inode, struct list_head *head, int how, struct nfs_commit_info *cinfo); void nfs_retry_commit(struct list_head *page_list, struct pnfs_layout_segment *lseg, struct nfs_commit_info *cinfo, u32 ds_commit_idx); void nfs_commitdata_release(struct nfs_commit_data *data); void nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo); void nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst, struct nfs_commit_info *cinfo); void nfs_request_remove_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo); void nfs_init_cinfo(struct nfs_commit_info *cinfo, struct inode *inode, struct nfs_direct_req *dreq); int nfs_key_timeout_notify(struct file *filp, struct inode *inode); bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); int nfs_filemap_write_and_wait_range(struct address_space *mapping, loff_t lstart, loff_t lend); #ifdef CONFIG_NFS_V4_1 static inline void pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets, unsigned int nbuckets) { unsigned int i; for (i = 0; i < nbuckets; i++) buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; } static inline void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) { struct pnfs_commit_array *array; rcu_read_lock(); list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list) pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets, array->nbuckets); rcu_read_unlock(); } #else static inline void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) { } #endif #ifdef CONFIG_MIGRATION extern int nfs_migrate_page(struct address_space *, struct page *, struct page *, enum migrate_mode); #endif static inline int nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, const struct nfs_write_verifier *v2) { return memcmp(v1->data, v2->data, sizeof(v1->data)); } static inline bool nfs_write_match_verf(const struct nfs_writeverf *verf, struct nfs_page *req) { return verf->committed > NFS_UNSTABLE && !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier); } /* unlink.c */ extern struct rpc_task * nfs_async_rename(struct inode *old_dir, struct inode *new_dir, struct dentry *old_dentry, struct dentry *new_dentry, void (*complete)(struct rpc_task *, struct nfs_renamedata *)); extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); /* direct.c */ void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, struct nfs_direct_req *dreq); extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); /* nfs4proc.c */ extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, const struct nfs_client_initdata *); extern int nfs40_walk_client_list(struct nfs_client *clp, struct nfs_client **result, const struct cred *cred); extern int nfs41_walk_client_list(struct nfs_client *clp, struct nfs_client **result, const struct cred *cred); extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *data); static inline struct inode *nfs_igrab_and_active(struct inode *inode) { struct super_block *sb = inode->i_sb; if (sb && nfs_sb_active(sb)) { if (igrab(inode)) return inode; nfs_sb_deactive(sb); } return NULL; } static inline void nfs_iput_and_deactive(struct inode *inode) { if (inode != NULL) { struct super_block *sb = inode->i_sb; iput(inode); nfs_sb_deactive(sb); } } /* * Determine the device name as a string */ static inline char *nfs_devname(struct dentry *dentry, char *buffer, ssize_t buflen) { char *dummy; return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); } /* * Determine the actual block size (and log2 thereof) */ static inline unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) { /* make sure blocksize is a power of two */ if ((bsize & (bsize - 1)) || nrbitsp) { unsigned char nrbits; for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) ; bsize = 1 << nrbits; if (nrbitsp) *nrbitsp = nrbits; } return bsize; } /* * Calculate the number of 512byte blocks used. */ static inline blkcnt_t nfs_calc_block_size(u64 tsize) { blkcnt_t used = (tsize + 511) >> 9; return (used > ULONG_MAX) ? ULONG_MAX : used; } /* * Compute and set NFS server blocksize */ static inline unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) { if (bsize < NFS_MIN_FILE_IO_SIZE) bsize = NFS_DEF_FILE_IO_SIZE; else if (bsize >= NFS_MAX_FILE_IO_SIZE) bsize = NFS_MAX_FILE_IO_SIZE; return nfs_block_bits(bsize, nrbitsp); } /* * Determine the maximum file size for a superblock */ static inline void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) { sb->s_maxbytes = (loff_t)maxfilesize; if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) sb->s_maxbytes = MAX_LFS_FILESIZE; } /* * Record the page as unstable (an extra writeback period) and mark its * inode as dirty. */ static inline void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) { if (!cinfo->dreq) { struct inode *inode = page_file_mapping(page)->host; /* This page is really still in write-back - just that the * writeback is happening on the server now. */ inc_node_page_state(page, NR_WRITEBACK); inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); __mark_inode_dirty(inode, I_DIRTY_DATASYNC); } } /* * Determine the number of bytes of data the page contains */ static inline unsigned int nfs_page_length(struct page *page) { loff_t i_size = i_size_read(page_file_mapping(page)->host); if (i_size > 0) { pgoff_t index = page_index(page); pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; if (index < end_index) return PAGE_SIZE; if (index == end_index) return ((i_size - 1) & ~PAGE_MASK) + 1; } return 0; } /* * Convert a umode to a dirent->d_type */ static inline unsigned char nfs_umode_to_dtype(umode_t mode) { return (mode >> 12) & 15; } /* * Determine the number of pages in an array of length 'len' and * with a base offset of 'base' */ static inline unsigned int nfs_page_array_len(unsigned int base, size_t len) { return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >> PAGE_SHIFT; } /* * Convert a struct timespec64 into a 64-bit change attribute * * This does approximately the same thing as timespec64_to_ns(), * but for calculation efficiency, we multiply the seconds by * 1024*1024*1024. */ static inline u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) { return ((u64)ts->tv_sec << 30) + ts->tv_nsec; } #ifdef CONFIG_CRC32 /** * nfs_fhandle_hash - calculate the crc32 hash for the filehandle * @fh - pointer to filehandle * * returns a crc32 hash for the filehandle that is compatible with * the one displayed by "wireshark". */ static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) { return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); } static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) { return ~crc32_le(0xFFFFFFFF, &stateid->other[0], NFS4_STATEID_OTHER_SIZE); } #else static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) { return 0; } static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) { return 0; } #endif static inline bool nfs_error_is_fatal(int err) { switch (err) { case -ERESTARTSYS: case -EINTR: case -EACCES: case -EDQUOT: case -EFBIG: case -EIO: case -ENOSPC: case -EROFS: case -ESTALE: case -E2BIG: case -ENOMEM: case -ETIMEDOUT: return true; default: return false; } } static inline bool nfs_error_is_fatal_on_server(int err) { switch (err) { case 0: case -ERESTARTSYS: case -EINTR: return false; } return nfs_error_is_fatal(err); } /* * Select between a default port value and a user-specified port value. * If a zero value is set, then autobind will be used. */ static inline void nfs_set_port(struct sockaddr *sap, int *port, const unsigned short default_port) { if (*port == NFS_UNSPEC_PORT) *port = default_port; rpc_set_port(sap, *port); }
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9621 9622 9623 9624 9625 9626 9627 9628 9629 9630 9631 9632 9633 9634 9635 9636 9637 9638 9639 9640 9641 9642 9643 9644 9645 9646 9647 9648 9649 9650 9651 9652 9653 9654 9655 9656 9657 9658 9659 9660 9661 9662 9663 9664 9665 9666 9667 9668 9669 9670 9671 9672 9673 9674 9675 9676 9677 9678 9679 9680 9681 9682 9683 // SPDX-License-Identifier: GPL-2.0 /* * ring buffer based function tracer * * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com> * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> * * Originally taken from the RT patch by: * Arnaldo Carvalho de Melo <acme@redhat.com> * * Based on code from the latency_tracer, that is: * Copyright (C) 2004-2006 Ingo Molnar * Copyright (C) 2004 Nadia Yvette Chambers */ #include <linux/ring_buffer.h> #include <generated/utsrelease.h> #include <linux/stacktrace.h> #include <linux/writeback.h> #include <linux/kallsyms.h> #include <linux/security.h> #include <linux/seq_file.h> #include <linux/notifier.h> #include <linux/irqflags.h> #include <linux/debugfs.h> #include <linux/tracefs.h> #include <linux/pagemap.h> #include <linux/hardirq.h> #include <linux/linkage.h> #include <linux/uaccess.h> #include <linux/vmalloc.h> #include <linux/ftrace.h> #include <linux/module.h> #include <linux/percpu.h> #include <linux/splice.h> #include <linux/kdebug.h> #include <linux/string.h> #include <linux/mount.h> #include <linux/rwsem.h> #include <linux/slab.h> #include <linux/ctype.h> #include <linux/init.h> #include <linux/poll.h> #include <linux/nmi.h> #include <linux/fs.h> #include <linux/trace.h> #include <linux/sched/clock.h> #include <linux/sched/rt.h> #include <linux/fsnotify.h> #include <linux/irq_work.h> #include <linux/workqueue.h> #include "trace.h" #include "trace_output.h" /* * On boot up, the ring buffer is set to the minimum size, so that * we do not waste memory on systems that are not using tracing. */ bool ring_buffer_expanded; /* * We need to change this state when a selftest is running. * A selftest will lurk into the ring-buffer to count the * entries inserted during the selftest although some concurrent * insertions into the ring-buffer such as trace_printk could occurred * at the same time, giving false positive or negative results. */ static bool __read_mostly tracing_selftest_running; /* * If boot-time tracing including tracers/events via kernel cmdline * is running, we do not want to run SELFTEST. */ bool __read_mostly tracing_selftest_disabled; #ifdef CONFIG_FTRACE_STARTUP_TEST void __init disable_tracing_selftest(const char *reason) { if (!tracing_selftest_disabled) { tracing_selftest_disabled = true; pr_info("Ftrace startup test is disabled due to %s\n", reason); } } #endif /* Pipe tracepoints to printk */ struct trace_iterator *tracepoint_print_iter; int tracepoint_printk; static DEFINE_STATIC_KEY_FALSE(tracepoint_printk_key); /* For tracers that don't implement custom flags */ static struct tracer_opt dummy_tracer_opt[] = { { } }; static int dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) { return 0; } /* * To prevent the comm cache from being overwritten when no * tracing is active, only save the comm when a trace event * occurred. */ static DEFINE_PER_CPU(bool, trace_taskinfo_save); /* * Kill all tracing for good (never come back). * It is initialized to 1 but will turn to zero if the initialization * of the tracer is successful. But that is the only place that sets * this back to zero. */ static int tracing_disabled = 1; cpumask_var_t __read_mostly tracing_buffer_mask; /* * ftrace_dump_on_oops - variable to dump ftrace buffer on oops * * If there is an oops (or kernel panic) and the ftrace_dump_on_oops * is set, then ftrace_dump is called. This will output the contents * of the ftrace buffers to the console. This is very useful for * capturing traces that lead to crashes and outputing it to a * serial console. * * It is default off, but you can enable it with either specifying * "ftrace_dump_on_oops" in the kernel command line, or setting * /proc/sys/kernel/ftrace_dump_on_oops * Set 1 if you want to dump buffers of all CPUs * Set 2 if you want to dump the buffer of the CPU that triggered oops */ enum ftrace_dump_mode ftrace_dump_on_oops; /* When set, tracing will stop when a WARN*() is hit */ int __disable_trace_on_warning; #ifdef CONFIG_TRACE_EVAL_MAP_FILE /* Map of enums to their values, for "eval_map" file */ struct trace_eval_map_head { struct module *mod; unsigned long length; }; union trace_eval_map_item; struct trace_eval_map_tail { /* * "end" is first and points to NULL as it must be different * than "mod" or "eval_string" */ union trace_eval_map_item *next; const char *end; /* points to NULL */ }; static DEFINE_MUTEX(trace_eval_mutex); /* * The trace_eval_maps are saved in an array with two extra elements, * one at the beginning, and one at the end. The beginning item contains * the count of the saved maps (head.length), and the module they * belong to if not built in (head.mod). The ending item contains a * pointer to the next array of saved eval_map items. */ union trace_eval_map_item { struct trace_eval_map map; struct trace_eval_map_head head; struct trace_eval_map_tail tail; }; static union trace_eval_map_item *trace_eval_maps; #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ int tracing_set_tracer(struct trace_array *tr, const char *buf); static void ftrace_trace_userstack(struct trace_array *tr, struct trace_buffer *buffer, unsigned long flags, int pc); #define MAX_TRACER_SIZE 100 static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata; static char *default_bootup_tracer; static bool allocate_snapshot; static int __init set_cmdline_ftrace(char *str) { strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE); default_bootup_tracer = bootup_tracer_buf; /* We are using ftrace early, expand it */ ring_buffer_expanded = true; return 1; } __setup("ftrace=", set_cmdline_ftrace); static int __init set_ftrace_dump_on_oops(char *str) { if (*str++ != '=' || !*str) { ftrace_dump_on_oops = DUMP_ALL; return 1; } if (!strcmp("orig_cpu", str)) { ftrace_dump_on_oops = DUMP_ORIG; return 1; } return 0; } __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); static int __init stop_trace_on_warning(char *str) { if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) __disable_trace_on_warning = 1; return 1; } __setup("traceoff_on_warning", stop_trace_on_warning); static int __init boot_alloc_snapshot(char *str) { allocate_snapshot = true; /* We also need the main ring buffer expanded */ ring_buffer_expanded = true; return 1; } __setup("alloc_snapshot", boot_alloc_snapshot); static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata; static int __init set_trace_boot_options(char *str) { strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE); return 0; } __setup("trace_options=", set_trace_boot_options); static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata; static char *trace_boot_clock __initdata; static int __init set_trace_boot_clock(char *str) { strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE); trace_boot_clock = trace_boot_clock_buf; return 0; } __setup("trace_clock=", set_trace_boot_clock); static int __init set_tracepoint_printk(char *str) { if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) tracepoint_printk = 1; return 1; } __setup("tp_printk", set_tracepoint_printk); unsigned long long ns2usecs(u64 nsec) { nsec += 500; do_div(nsec, 1000); return nsec; } static void trace_process_export(struct trace_export *export, struct ring_buffer_event *event, int flag) { struct trace_entry *entry; unsigned int size = 0; if (export->flags & flag) { entry = ring_buffer_event_data(event); size = ring_buffer_event_length(event); export->write(export, entry, size); } } static DEFINE_MUTEX(ftrace_export_lock); static struct trace_export __rcu *ftrace_exports_list __read_mostly; static DEFINE_STATIC_KEY_FALSE(trace_function_exports_enabled); static DEFINE_STATIC_KEY_FALSE(trace_event_exports_enabled); static DEFINE_STATIC_KEY_FALSE(trace_marker_exports_enabled); static inline void ftrace_exports_enable(struct trace_export *export) { if (export->flags & TRACE_EXPORT_FUNCTION) static_branch_inc(&trace_function_exports_enabled); if (export->flags & TRACE_EXPORT_EVENT) static_branch_inc(&trace_event_exports_enabled); if (export->flags & TRACE_EXPORT_MARKER) static_branch_inc(&trace_marker_exports_enabled); } static inline void ftrace_exports_disable(struct trace_export *export) { if (export->flags & TRACE_EXPORT_FUNCTION) static_branch_dec(&trace_function_exports_enabled); if (export->flags & TRACE_EXPORT_EVENT) static_branch_dec(&trace_event_exports_enabled); if (export->flags & TRACE_EXPORT_MARKER) static_branch_dec(&trace_marker_exports_enabled); } static void ftrace_exports(struct ring_buffer_event *event, int flag) { struct trace_export *export; preempt_disable_notrace(); export = rcu_dereference_raw_check(ftrace_exports_list); while (export) { trace_process_export(export, event, flag); export = rcu_dereference_raw_check(export->next); } preempt_enable_notrace(); } static inline void add_trace_export(struct trace_export **list, struct trace_export *export) { rcu_assign_pointer(export->next, *list); /* * We are entering export into the list but another * CPU might be walking that list. We need to make sure * the export->next pointer is valid before another CPU sees * the export pointer included into the list. */ rcu_assign_pointer(*list, export); } static inline int rm_trace_export(struct trace_export **list, struct trace_export *export) { struct trace_export **p; for (p = list; *p != NULL; p = &(*p)->next) if (*p == export) break; if (*p != export) return -1; rcu_assign_pointer(*p, (*p)->next); return 0; } static inline void add_ftrace_export(struct trace_export **list, struct trace_export *export) { ftrace_exports_enable(export); add_trace_export(list, export); } static inline int rm_ftrace_export(struct trace_export **list, struct trace_export *export) { int ret; ret = rm_trace_export(list, export); ftrace_exports_disable(export); return ret; } int register_ftrace_export(struct trace_export *export) { if (WARN_ON_ONCE(!export->write)) return -1; mutex_lock(&ftrace_export_lock); add_ftrace_export(&ftrace_exports_list, export); mutex_unlock(&ftrace_export_lock); return 0; } EXPORT_SYMBOL_GPL(register_ftrace_export); int unregister_ftrace_export(struct trace_export *export) { int ret; mutex_lock(&ftrace_export_lock); ret = rm_ftrace_export(&ftrace_exports_list, export); mutex_unlock(&ftrace_export_lock); return ret; } EXPORT_SYMBOL_GPL(unregister_ftrace_export); /* trace_flags holds trace_options default values */ #define TRACE_DEFAULT_FLAGS \ (FUNCTION_DEFAULT_FLAGS | \ TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | \ TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | \ TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | \ TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS) /* trace_options that are only supported by global_trace */ #define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK | \ TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD) /* trace_flags that are default zero for instances */ #define ZEROED_TRACE_FLAGS \ (TRACE_ITER_EVENT_FORK | TRACE_ITER_FUNC_FORK) /* * The global_trace is the descriptor that holds the top-level tracing * buffers for the live tracing. */ static struct trace_array global_trace = { .trace_flags = TRACE_DEFAULT_FLAGS, }; LIST_HEAD(ftrace_trace_arrays); int trace_array_get(struct trace_array *this_tr) { struct trace_array *tr; int ret = -ENODEV; mutex_lock(&trace_types_lock); list_for_each_entry(tr, &ftrace_trace_arrays, list) { if (tr == this_tr) { tr->ref++; ret = 0; break; } } mutex_unlock(&trace_types_lock); return ret; } static void __trace_array_put(struct trace_array *this_tr) { WARN_ON(!this_tr->ref); this_tr->ref--; } /** * trace_array_put - Decrement the reference counter for this trace array. * * NOTE: Use this when we no longer need the trace array returned by * trace_array_get_by_name(). This ensures the trace array can be later * destroyed. * */ void trace_array_put(struct trace_array *this_tr) { if (!this_tr) return; mutex_lock(&trace_types_lock); __trace_array_put(this_tr); mutex_unlock(&trace_types_lock); } EXPORT_SYMBOL_GPL(trace_array_put); int tracing_check_open_get_tr(struct trace_array *tr) { int ret; ret = security_locked_down(LOCKDOWN_TRACEFS); if (ret) return ret; if (tracing_disabled) return -ENODEV; if (tr && trace_array_get(tr) < 0) return -ENODEV; return 0; } int call_filter_check_discard(struct trace_event_call *call, void *rec, struct trace_buffer *buffer, struct ring_buffer_event *event) { if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && !filter_match_preds(call->filter, rec)) { __trace_event_discard_commit(buffer, event); return 1; } return 0; } void trace_free_pid_list(struct trace_pid_list *pid_list) { vfree(pid_list->pids); kfree(pid_list); } /** * trace_find_filtered_pid - check if a pid exists in a filtered_pid list * @filtered_pids: The list of pids to check * @search_pid: The PID to find in @filtered_pids * * Returns true if @search_pid is fonud in @filtered_pids, and false otherwis. */ bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid) { /* * If pid_max changed after filtered_pids was created, we * by default ignore all pids greater than the previous pid_max. */ if (search_pid >= filtered_pids->pid_max) return false; return test_bit(search_pid, filtered_pids->pids); } /** * trace_ignore_this_task - should a task be ignored for tracing * @filtered_pids: The list of pids to check * @task: The task that should be ignored if not filtered * * Checks if @task should be traced or not from @filtered_pids. * Returns true if @task should *NOT* be traced. * Returns false if @task should be traced. */ bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, struct trace_pid_list *filtered_no_pids, struct task_struct *task) { /* * If filterd_no_pids is not empty, and the task's pid is listed * in filtered_no_pids, then return true. * Otherwise, if filtered_pids is empty, that means we can * trace all tasks. If it has content, then only trace pids * within filtered_pids. */ return (filtered_pids && !trace_find_filtered_pid(filtered_pids, task->pid)) || (filtered_no_pids && trace_find_filtered_pid(filtered_no_pids, task->pid)); } /** * trace_filter_add_remove_task - Add or remove a task from a pid_list * @pid_list: The list to modify * @self: The current task for fork or NULL for exit * @task: The task to add or remove * * If adding a task, if @self is defined, the task is only added if @self * is also included in @pid_list. This happens on fork and tasks should * only be added when the parent is listed. If @self is NULL, then the * @task pid will be removed from the list, which would happen on exit * of a task. */ void trace_filter_add_remove_task(struct trace_pid_list *pid_list, struct task_struct *self, struct task_struct *task) { if (!pid_list) return; /* For forks, we only add if the forking task is listed */ if (self) { if (!trace_find_filtered_pid(pid_list, self->pid)) return; } /* Sorry, but we don't support pid_max changing after setting */ if (task->pid >= pid_list->pid_max) return; /* "self" is set for forks, and NULL for exits */ if (self) set_bit(task->pid, pid_list->pids); else clear_bit(task->pid, pid_list->pids); } /** * trace_pid_next - Used for seq_file to get to the next pid of a pid_list * @pid_list: The pid list to show * @v: The last pid that was shown (+1 the actual pid to let zero be displayed) * @pos: The position of the file * * This is used by the seq_file "next" operation to iterate the pids * listed in a trace_pid_list structure. * * Returns the pid+1 as we want to display pid of zero, but NULL would * stop the iteration. */ void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos) { unsigned long pid = (unsigned long)v; (*pos)++; /* pid already is +1 of the actual prevous bit */ pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid); /* Return pid + 1 to allow zero to be represented */ if (pid < pid_list->pid_max) return (void *)(pid + 1); return NULL; } /** * trace_pid_start - Used for seq_file to start reading pid lists * @pid_list: The pid list to show * @pos: The position of the file * * This is used by seq_file "start" operation to start the iteration * of listing pids. * * Returns the pid+1 as we want to display pid of zero, but NULL would * stop the iteration. */ void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos) { unsigned long pid; loff_t l = 0; pid = find_first_bit(pid_list->pids, pid_list->pid_max); if (pid >= pid_list->pid_max) return NULL; /* Return pid + 1 so that zero can be the exit value */ for (pid++; pid && l < *pos; pid = (unsigned long)trace_pid_next(pid_list, (void *)pid, &l)) ; return (void *)pid; } /** * trace_pid_show - show the current pid in seq_file processing * @m: The seq_file structure to write into * @v: A void pointer of the pid (+1) value to display * * Can be directly used by seq_file operations to display the current * pid value. */ int trace_pid_show(struct seq_file *m, void *v) { unsigned long pid = (unsigned long)v - 1; seq_printf(m, "%lu\n", pid); return 0; } /* 128 should be much more than enough */ #define PID_BUF_SIZE 127 int trace_pid_write(struct trace_pid_list *filtered_pids, struct trace_pid_list **new_pid_list, const char __user *ubuf, size_t cnt) { struct trace_pid_list *pid_list; struct trace_parser parser; unsigned long val; int nr_pids = 0; ssize_t read = 0; ssize_t ret = 0; loff_t pos; pid_t pid; if (trace_parser_get_init(&parser, PID_BUF_SIZE + 1)) return -ENOMEM; /* * Always recreate a new array. The write is an all or nothing * operation. Always create a new array when adding new pids by * the user. If the operation fails, then the current list is * not modified. */ pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL); if (!pid_list) { trace_parser_put(&parser); return -ENOMEM; } pid_list->pid_max = READ_ONCE(pid_max); /* Only truncating will shrink pid_max */ if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max) pid_list->pid_max = filtered_pids->pid_max; pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3); if (!pid_list->pids) { trace_parser_put(&parser); kfree(pid_list); return -ENOMEM; } if (filtered_pids) { /* copy the current bits to the new max */ for_each_set_bit(pid, filtered_pids->pids, filtered_pids->pid_max) { set_bit(pid, pid_list->pids); nr_pids++; } } while (cnt > 0) { pos = 0; ret = trace_get_user(&parser, ubuf, cnt, &pos); if (ret < 0 || !trace_parser_loaded(&parser)) break; read += ret; ubuf += ret; cnt -= ret; ret = -EINVAL; if (kstrtoul(parser.buffer, 0, &val)) break; if (val >= pid_list->pid_max) break; pid = (pid_t)val; set_bit(pid, pid_list->pids); nr_pids++; trace_parser_clear(&parser); ret = 0; } trace_parser_put(&parser); if (ret < 0) { trace_free_pid_list(pid_list); return ret; } if (!nr_pids) { /* Cleared the list of pids */ trace_free_pid_list(pid_list); read = ret; pid_list = NULL; } *new_pid_list = pid_list; return read; } static u64 buffer_ftrace_now(struct array_buffer *buf, int cpu) { u64 ts; /* Early boot up does not have a buffer yet */ if (!buf->buffer) return trace_clock_local(); ts = ring_buffer_time_stamp(buf->buffer, cpu); ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts); return ts; } u64 ftrace_now(int cpu) { return buffer_ftrace_now(&global_trace.array_buffer, cpu); } /** * tracing_is_enabled - Show if global_trace has been disabled * * Shows if the global trace has been enabled or not. It uses the * mirror flag "buffer_disabled" to be used in fast paths such as for * the irqsoff tracer. But it may be inaccurate due to races. If you * need to know the accurate state, use tracing_is_on() which is a little * slower, but accurate. */ int tracing_is_enabled(void) { /* * For quick access (irqsoff uses this in fast path), just * return the mirror variable of the state of the ring buffer. * It's a little racy, but we don't really care. */ smp_rmb(); return !global_trace.buffer_disabled; } /* * trace_buf_size is the size in bytes that is allocated * for a buffer. Note, the number of bytes is always rounded * to page size. * * This number is purposely set to a low number of 16384. * If the dump on oops happens, it will be much appreciated * to not have to wait for all that output. Anyway this can be * boot time and run time configurable. */ #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; /* trace_types holds a link list of available tracers. */ static struct tracer *trace_types __read_mostly; /* * trace_types_lock is used to protect the trace_types list. */ DEFINE_MUTEX(trace_types_lock); /* * serialize the access of the ring buffer * * ring buffer serializes readers, but it is low level protection. * The validity of the events (which returns by ring_buffer_peek() ..etc) * are not protected by ring buffer. * * The content of events may become garbage if we allow other process consumes * these events concurrently: * A) the page of the consumed events may become a normal page * (not reader page) in ring buffer, and this page will be rewrited * by events producer. * B) The page of the consumed events may become a page for splice_read, * and this page will be returned to system. * * These primitives allow multi process access to different cpu ring buffer * concurrently. * * These primitives don't distinguish read-only and read-consume access. * Multi read-only access are also serialized. */ #ifdef CONFIG_SMP static DECLARE_RWSEM(all_cpu_access_lock); static DEFINE_PER_CPU(struct mutex, cpu_access_lock); static inline void trace_access_lock(int cpu) { if (cpu == RING_BUFFER_ALL_CPUS) { /* gain it for accessing the whole ring buffer. */ down_write(&all_cpu_access_lock); } else { /* gain it for accessing a cpu ring buffer. */ /* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */ down_read(&all_cpu_access_lock); /* Secondly block other access to this @cpu ring buffer. */ mutex_lock(&per_cpu(cpu_access_lock, cpu)); } } static inline void trace_access_unlock(int cpu) { if (cpu == RING_BUFFER_ALL_CPUS) { up_write(&all_cpu_access_lock); } else { mutex_unlock(&per_cpu(cpu_access_lock, cpu)); up_read(&all_cpu_access_lock); } } static inline void trace_access_lock_init(void) { int cpu; for_each_possible_cpu(cpu) mutex_init(&per_cpu(cpu_access_lock, cpu)); } #else static DEFINE_MUTEX(access_lock); static inline void trace_access_lock(int cpu) { (void)cpu; mutex_lock(&access_lock); } static inline void trace_access_unlock(int cpu) { (void)cpu; mutex_unlock(&access_lock); } static inline void trace_access_lock_init(void) { } #endif #ifdef CONFIG_STACKTRACE static void __ftrace_trace_stack(struct trace_buffer *buffer, unsigned long flags, int skip, int pc, struct pt_regs *regs); static inline void ftrace_trace_stack(struct trace_array *tr, struct trace_buffer *buffer, unsigned long flags, int skip, int pc, struct pt_regs *regs); #else static inline void __ftrace_trace_stack(struct trace_buffer *buffer, unsigned long flags, int skip, int pc, struct pt_regs *regs) { } static inline void ftrace_trace_stack(struct trace_array *tr, struct trace_buffer *buffer, unsigned long flags, int skip, int pc, struct pt_regs *regs) { } #endif static __always_inline void trace_event_setup(struct ring_buffer_event *event, int type, unsigned long flags, int pc) { struct trace_entry *ent = ring_buffer_event_data(event); tracing_generic_entry_update(ent, type, flags, pc); } static __always_inline struct ring_buffer_event * __trace_buffer_lock_reserve(struct trace_buffer *buffer, int type, unsigned long len, unsigned long flags, int pc) { struct ring_buffer_event *event; event = ring_buffer_lock_reserve(buffer, len); if (event != NULL) trace_event_setup(event, type, flags, pc); return event; } void tracer_tracing_on(struct trace_array *tr) { if (tr->array_buffer.buffer) ring_buffer_record_on(tr->array_buffer.buffer); /* * This flag is looked at when buffers haven't been allocated * yet, or by some tracers (like irqsoff), that just want to * know if the ring buffer has been disabled, but it can handle * races of where it gets disabled but we still do a record. * As the check is in the fast path of the tracers, it is more * important to be fast than accurate. */ tr->buffer_disabled = 0; /* Make the flag seen by readers */ smp_wmb(); } /** * tracing_on - enable tracing buffers * * This function enables tracing buffers that may have been * disabled with tracing_off. */ void tracing_on(void) { tracer_tracing_on(&global_trace); } EXPORT_SYMBOL_GPL(tracing_on); static __always_inline void __buffer_unlock_commit(struct trace_buffer *buffer, struct ring_buffer_event *event) { __this_cpu_write(trace_taskinfo_save, true); /* If this is the temp buffer, we need to commit fully */ if (this_cpu_read(trace_buffered_event) == event) { /* Length is in event->array[0] */ ring_buffer_write(buffer, event->array[0], &event->array[1]); /* Release the temp buffer */ this_cpu_dec(trace_buffered_event_cnt); } else ring_buffer_unlock_commit(buffer, event); } /** * __trace_puts - write a constant string into the trace buffer. * @ip: The address of the caller * @str: The constant string to write * @size: The size of the string. */ int __trace_puts(unsigned long ip, const char *str, int size) { struct ring_buffer_event *event; struct trace_buffer *buffer; struct print_entry *entry; unsigned long irq_flags; int alloc; int pc; if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) return 0; pc = preempt_count(); if (unlikely(tracing_selftest_running || tracing_disabled)) return 0; alloc = sizeof(*entry) + size + 2; /* possible \n added */ local_save_flags(irq_flags); buffer = global_trace.array_buffer.buffer; ring_buffer_nest_start(buffer); event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, irq_flags, pc); if (!event) { size = 0; goto out; } entry = ring_buffer_event_data(event); entry->ip = ip; memcpy(&entry->buf, str, size); /* Add a newline if necessary */ if (entry->buf[size - 1] != '\n') { entry->buf[size] = '\n'; entry->buf[size + 1] = '\0'; } else entry->buf[size] = '\0'; __buffer_unlock_commit(buffer, event); ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); out: ring_buffer_nest_end(buffer); return size; } EXPORT_SYMBOL_GPL(__trace_puts); /** * __trace_bputs - write the pointer to a constant string into trace buffer * @ip: The address of the caller * @str: The constant string to write to the buffer to */ int __trace_bputs(unsigned long ip, const char *str) { struct ring_buffer_event *event; struct trace_buffer *buffer; struct bputs_entry *entry; unsigned long irq_flags; int size = sizeof(struct bputs_entry); int ret = 0; int pc; if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) return 0; pc = preempt_count(); if (unlikely(tracing_selftest_running || tracing_disabled)) return 0; local_save_flags(irq_flags); buffer = global_trace.array_buffer.buffer; ring_buffer_nest_start(buffer); event = __trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size, irq_flags, pc); if (!event) goto out; entry = ring_buffer_event_data(event); entry->ip = ip; entry->str = str; __buffer_unlock_commit(buffer, event); ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); ret = 1; out: ring_buffer_nest_end(buffer); return ret; } EXPORT_SYMBOL_GPL(__trace_bputs); #ifdef CONFIG_TRACER_SNAPSHOT static void tracing_snapshot_instance_cond(struct trace_array *tr, void *cond_data) { struct tracer *tracer = tr->current_trace; unsigned long flags; if (in_nmi()) { internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n"); internal_trace_puts("*** snapshot is being ignored ***\n"); return; } if (!tr->allocated_snapshot) { internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n"); internal_trace_puts("*** stopping trace here! ***\n"); tracing_off(); return; } /* Note, snapshot can not be used when the tracer uses it */ if (tracer->use_max_tr) { internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n"); internal_trace_puts("*** Can not use snapshot (sorry) ***\n"); return; } local_irq_save(flags); update_max_tr(tr, current, smp_processor_id(), cond_data); local_irq_restore(flags); } void tracing_snapshot_instance(struct trace_array *tr) { tracing_snapshot_instance_cond(tr, NULL); } /** * tracing_snapshot - take a snapshot of the current buffer. * * This causes a swap between the snapshot buffer and the current live * tracing buffer. You can use this to take snapshots of the live * trace when some condition is triggered, but continue to trace. * * Note, make sure to allocate the snapshot with either * a tracing_snapshot_alloc(), or by doing it manually * with: echo 1 > /sys/kernel/debug/tracing/snapshot * * If the snapshot buffer is not allocated, it will stop tracing. * Basically making a permanent snapshot. */ void tracing_snapshot(void) { struct trace_array *tr = &global_trace; tracing_snapshot_instance(tr); } EXPORT_SYMBOL_GPL(tracing_snapshot); /** * tracing_snapshot_cond - conditionally take a snapshot of the current buffer. * @tr: The tracing instance to snapshot * @cond_data: The data to be tested conditionally, and possibly saved * * This is the same as tracing_snapshot() except that the snapshot is * conditional - the snapshot will only happen if the * cond_snapshot.update() implementation receiving the cond_data * returns true, which means that the trace array's cond_snapshot * update() operation used the cond_data to determine whether the * snapshot should be taken, and if it was, presumably saved it along * with the snapshot. */ void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) { tracing_snapshot_instance_cond(tr, cond_data); } EXPORT_SYMBOL_GPL(tracing_snapshot_cond); /** * tracing_snapshot_cond_data - get the user data associated with a snapshot * @tr: The tracing instance * * When the user enables a conditional snapshot using * tracing_snapshot_cond_enable(), the user-defined cond_data is saved * with the snapshot. This accessor is used to retrieve it. * * Should not be called from cond_snapshot.update(), since it takes * the tr->max_lock lock, which the code calling * cond_snapshot.update() has already done. * * Returns the cond_data associated with the trace array's snapshot. */ void *tracing_cond_snapshot_data(struct trace_array *tr) { void *cond_data = NULL; arch_spin_lock(&tr->max_lock); if (tr->cond_snapshot) cond_data = tr->cond_snapshot->cond_data; arch_spin_unlock(&tr->max_lock); return cond_data; } EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); static int resize_buffer_duplicate_size(struct array_buffer *trace_buf, struct array_buffer *size_buf, int cpu_id); static void set_buffer_entries(struct array_buffer *buf, unsigned long val); int tracing_alloc_snapshot_instance(struct trace_array *tr) { int ret; if (!tr->allocated_snapshot) { /* allocate spare buffer */ ret = resize_buffer_duplicate_size(&tr->max_buffer, &tr->array_buffer, RING_BUFFER_ALL_CPUS); if (ret < 0) return ret; tr->allocated_snapshot = true; } return 0; } static void free_snapshot(struct trace_array *tr) { /* * We don't free the ring buffer. instead, resize it because * The max_tr ring buffer has some state (e.g. ring->clock) and * we want preserve it. */ ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); set_buffer_entries(&tr->max_buffer, 1); tracing_reset_online_cpus(&tr->max_buffer); tr->allocated_snapshot = false; } /** * tracing_alloc_snapshot - allocate snapshot buffer. * * This only allocates the snapshot buffer if it isn't already * allocated - it doesn't also take a snapshot. * * This is meant to be used in cases where the snapshot buffer needs * to be set up for events that can't sleep but need to be able to * trigger a snapshot. */ int tracing_alloc_snapshot(void) { struct trace_array *tr = &global_trace; int ret; ret = tracing_alloc_snapshot_instance(tr); WARN_ON(ret < 0); return ret; } EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); /** * tracing_snapshot_alloc - allocate and take a snapshot of the current buffer. * * This is similar to tracing_snapshot(), but it will allocate the * snapshot buffer if it isn't already allocated. Use this only * where it is safe to sleep, as the allocation may sleep. * * This causes a swap between the snapshot buffer and the current live * tracing buffer. You can use this to take snapshots of the live * trace when some condition is triggered, but continue to trace. */ void tracing_snapshot_alloc(void) { int ret; ret = tracing_alloc_snapshot(); if (ret < 0) return; tracing_snapshot(); } EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); /** * tracing_snapshot_cond_enable - enable conditional snapshot for an instance * @tr: The tracing instance * @cond_data: User data to associate with the snapshot * @update: Implementation of the cond_snapshot update function * * Check whether the conditional snapshot for the given instance has * already been enabled, or if the current tracer is already using a * snapshot; if so, return -EBUSY, else create a cond_snapshot and * save the cond_data and update function inside. * * Returns 0 if successful, error otherwise. */ int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update) { struct cond_snapshot *cond_snapshot; int ret = 0; cond_snapshot = kzalloc(sizeof(*cond_snapshot), GFP_KERNEL); if (!cond_snapshot) return -ENOMEM; cond_snapshot->cond_data = cond_data; cond_snapshot->update = update; mutex_lock(&trace_types_lock); ret = tracing_alloc_snapshot_instance(tr); if (ret) goto fail_unlock; if (tr->current_trace->use_max_tr) { ret = -EBUSY; goto fail_unlock; } /* * The cond_snapshot can only change to NULL without the * trace_types_lock. We don't care if we race with it going * to NULL, but we want to make sure that it's not set to * something other than NULL when we get here, which we can * do safely with only holding the trace_types_lock and not * having to take the max_lock. */ if (tr->cond_snapshot) { ret = -EBUSY; goto fail_unlock; } arch_spin_lock(&tr->max_lock); tr->cond_snapshot = cond_snapshot; arch_spin_unlock(&tr->max_lock); mutex_unlock(&trace_types_lock); return ret; fail_unlock: mutex_unlock(&trace_types_lock); kfree(cond_snapshot); return ret; } EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); /** * tracing_snapshot_cond_disable - disable conditional snapshot for an instance * @tr: The tracing instance * * Check whether the conditional snapshot for the given instance is * enabled; if so, free the cond_snapshot associated with it, * otherwise return -EINVAL. * * Returns 0 if successful, error otherwise. */ int tracing_snapshot_cond_disable(struct trace_array *tr) { int ret = 0; arch_spin_lock(&tr->max_lock); if (!tr->cond_snapshot) ret = -EINVAL; else { kfree(tr->cond_snapshot); tr->cond_snapshot = NULL; } arch_spin_unlock(&tr->max_lock); return ret; } EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); #else void tracing_snapshot(void) { WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); } EXPORT_SYMBOL_GPL(tracing_snapshot); void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) { WARN_ONCE(1, "Snapshot feature not enabled, but internal conditional snapshot used"); } EXPORT_SYMBOL_GPL(tracing_snapshot_cond); int tracing_alloc_snapshot(void) { WARN_ONCE(1, "Snapshot feature not enabled, but snapshot allocation used"); return -ENODEV; } EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); void tracing_snapshot_alloc(void) { /* Give warning */ tracing_snapshot(); } EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); void *tracing_cond_snapshot_data(struct trace_array *tr) { return NULL; } EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update) { return -ENODEV; } EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); int tracing_snapshot_cond_disable(struct trace_array *tr) { return false; } EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); #endif /* CONFIG_TRACER_SNAPSHOT */ void tracer_tracing_off(struct trace_array *tr) { if (tr->array_buffer.buffer) ring_buffer_record_off(tr->array_buffer.buffer); /* * This flag is looked at when buffers haven't been allocated * yet, or by some tracers (like irqsoff), that just want to * know if the ring buffer has been disabled, but it can handle * races of where it gets disabled but we still do a record. * As the check is in the fast path of the tracers, it is more * important to be fast than accurate. */ tr->buffer_disabled = 1; /* Make the flag seen by readers */ smp_wmb(); } /** * tracing_off - turn off tracing buffers * * This function stops the tracing buffers from recording data. * It does not disable any overhead the tracers themselves may * be causing. This function simply causes all recording to * the ring buffers to fail. */ void tracing_off(void) { tracer_tracing_off(&global_trace); } EXPORT_SYMBOL_GPL(tracing_off); void disable_trace_on_warning(void) { if (__disable_trace_on_warning) { trace_array_printk_buf(global_trace.array_buffer.buffer, _THIS_IP_, "Disabling tracing due to warning\n"); tracing_off(); } } /** * tracer_tracing_is_on - show real state of ring buffer enabled * @tr : the trace array to know if ring buffer is enabled * * Shows real state of the ring buffer if it is enabled or not. */ bool tracer_tracing_is_on(struct trace_array *tr) { if (tr->array_buffer.buffer) return ring_buffer_record_is_on(tr->array_buffer.buffer); return !tr->buffer_disabled; } /** * tracing_is_on - show state of ring buffers enabled */ int tracing_is_on(void) { return tracer_tracing_is_on(&global_trace); } EXPORT_SYMBOL_GPL(tracing_is_on); static int __init set_buf_size(char *str) { unsigned long buf_size; if (!str) return 0; buf_size = memparse(str, &str); /* nr_entries can not be zero */ if (buf_size == 0) return 0; trace_buf_size = buf_size; return 1; } __setup("trace_buf_size=", set_buf_size); static int __init set_tracing_thresh(char *str) { unsigned long threshold; int ret; if (!str) return 0; ret = kstrtoul(str, 0, &threshold); if (ret < 0) return 0; tracing_thresh = threshold * 1000; return 1; } __setup("tracing_thresh=", set_tracing_thresh); unsigned long nsecs_to_usecs(unsigned long nsecs) { return nsecs / 1000; } /* * TRACE_FLAGS is defined as a tuple matching bit masks with strings. * It uses C(a, b) where 'a' is the eval (enum) name and 'b' is the string that * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list * of strings in the order that the evals (enum) were defined. */ #undef C #define C(a, b) b /* These must match the bit postions in trace_iterator_flags */ static const char *trace_options[] = { TRACE_FLAGS NULL }; static struct { u64 (*func)(void); const char *name; int in_ns; /* is this clock in nanoseconds? */ } trace_clocks[] = { { trace_clock_local, "local", 1 }, { trace_clock_global, "global", 1 }, { trace_clock_counter, "counter", 0 }, { trace_clock_jiffies, "uptime", 0 }, { trace_clock, "perf", 1 }, { ktime_get_mono_fast_ns, "mono", 1 }, { ktime_get_raw_fast_ns, "mono_raw", 1 }, { ktime_get_boot_fast_ns, "boot", 1 }, ARCH_TRACE_CLOCKS }; bool trace_clock_in_ns(struct trace_array *tr) { if (trace_clocks[tr->clock_id].in_ns) return true; return false; } /* * trace_parser_get_init - gets the buffer for trace parser */ int trace_parser_get_init(struct trace_parser *parser, int size) { memset(parser, 0, sizeof(*parser)); parser->buffer = kmalloc(size, GFP_KERNEL); if (!parser->buffer) return 1; parser->size = size; return 0; } /* * trace_parser_put - frees the buffer for trace parser */ void trace_parser_put(struct trace_parser *parser) { kfree(parser->buffer); parser->buffer = NULL; } /* * trace_get_user - reads the user input string separated by space * (matched by isspace(ch)) * * For each string found the 'struct trace_parser' is updated, * and the function returns. * * Returns number of bytes read. * * See kernel/trace/trace.h for 'struct trace_parser' details. */ int trace_get_user(struct trace_parser *parser, const char __user *ubuf, size_t cnt, loff_t *ppos) { char ch; size_t read = 0; ssize_t ret; if (!*ppos) trace_parser_clear(parser); ret = get_user(ch, ubuf++); if (ret) goto out; read++; cnt--; /* * The parser is not finished with the last write, * continue reading the user input without skipping spaces. */ if (!parser->cont) { /* skip white space */ while (cnt && isspace(ch)) { ret = get_user(ch, ubuf++); if (ret) goto out; read++; cnt--; } parser->idx = 0; /* only spaces were written */ if (isspace(ch) || !ch) { *ppos += read; ret = read; goto out; } } /* read the non-space input */ while (cnt && !isspace(ch) && ch) { if (parser->idx < parser->size - 1) parser->buffer[parser->idx++] = ch; else { ret = -EINVAL; goto out; } ret = get_user(ch, ubuf++); if (ret) goto out; read++; cnt--; } /* We either got finished input or we have to wait for another call. */ if (isspace(ch) || !ch) { parser->buffer[parser->idx] = 0; parser->cont = false; } else if (parser->idx < parser->size - 1) { parser->cont = true; parser->buffer[parser->idx++] = ch; /* Make sure the parsed string always terminates with '\0'. */ parser->buffer[parser->idx] = 0; } else { ret = -EINVAL; goto out; } *ppos += read; ret = read; out: return ret; } /* TODO add a seq_buf_to_buffer() */ static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt) { int len; if (trace_seq_used(s) <= s->seq.readpos) return -EBUSY; len = trace_seq_used(s) - s->seq.readpos; if (cnt > len) cnt = len; memcpy(buf, s->buffer + s->seq.readpos, cnt); s->seq.readpos += cnt; return cnt; } unsigned long __read_mostly tracing_thresh; static const struct file_operations tracing_max_lat_fops; #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ defined(CONFIG_FSNOTIFY) static struct workqueue_struct *fsnotify_wq; static void latency_fsnotify_workfn(struct work_struct *work) { struct trace_array *tr = container_of(work, struct trace_array, fsnotify_work); fsnotify_inode(tr->d_max_latency->d_inode, FS_MODIFY); } static void latency_fsnotify_workfn_irq(struct irq_work *iwork) { struct trace_array *tr = container_of(iwork, struct trace_array, fsnotify_irqwork); queue_work(fsnotify_wq, &tr->fsnotify_work); } static void trace_create_maxlat_file(struct trace_array *tr, struct dentry *d_tracer) { INIT_WORK(&tr->fsnotify_work, latency_fsnotify_workfn); init_irq_work(&tr->fsnotify_irqwork, latency_fsnotify_workfn_irq); tr->d_max_latency = trace_create_file("tracing_max_latency", 0644, d_tracer, &tr->max_latency, &tracing_max_lat_fops); } __init static int latency_fsnotify_init(void) { fsnotify_wq = alloc_workqueue("tr_max_lat_wq", WQ_UNBOUND | WQ_HIGHPRI, 0); if (!fsnotify_wq) { pr_err("Unable to allocate tr_max_lat_wq\n"); return -ENOMEM; } return 0; } late_initcall_sync(latency_fsnotify_init); void latency_fsnotify(struct trace_array *tr) { if (!fsnotify_wq) return; /* * We cannot call queue_work(&tr->fsnotify_work) from here because it's * possible that we are called from __schedule() or do_idle(), which * could cause a deadlock. */ irq_work_queue(&tr->fsnotify_irqwork); } /* * (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ * defined(CONFIG_FSNOTIFY) */ #else #define trace_create_maxlat_file(tr, d_tracer) \ trace_create_file("tracing_max_latency", 0644, d_tracer, \ &tr->max_latency, &tracing_max_lat_fops) #endif #ifdef CONFIG_TRACER_MAX_TRACE /* * Copy the new maximum trace into the separate maximum-trace * structure. (this way the maximum trace is permanently saved, * for later retrieval via /sys/kernel/tracing/tracing_max_latency) */ static void __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) { struct array_buffer *trace_buf = &tr->array_buffer; struct array_buffer *max_buf = &tr->max_buffer; struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu); struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu); max_buf->cpu = cpu; max_buf->time_start = data->preempt_timestamp; max_data->saved_latency = tr->max_latency; max_data->critical_start = data->critical_start; max_data->critical_end = data->critical_end; strncpy(max_data->comm, tsk->comm, TASK_COMM_LEN); max_data->pid = tsk->pid; /* * If tsk == current, then use current_uid(), as that does not use * RCU. The irq tracer can be called out of RCU scope. */ if (tsk == current) max_data->uid = current_uid(); else max_data->uid = task_uid(tsk); max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; max_data->policy = tsk->policy; max_data->rt_priority = tsk->rt_priority; /* record this tasks comm */ tracing_record_cmdline(tsk); latency_fsnotify(tr); } /** * update_max_tr - snapshot all trace buffers from global_trace to max_tr * @tr: tracer * @tsk: the task with the latency * @cpu: The cpu that initiated the trace. * @cond_data: User data associated with a conditional snapshot * * Flip the buffers between the @tr and the max_tr and record information * about which task was the cause of this latency. */ void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, void *cond_data) { if (tr->stop_count) return; WARN_ON_ONCE(!irqs_disabled()); if (!tr->allocated_snapshot) { /* Only the nop tracer should hit this when disabling */ WARN_ON_ONCE(tr->current_trace != &nop_trace); return; } arch_spin_lock(&tr->max_lock); /* Inherit the recordable setting from array_buffer */ if (ring_buffer_record_is_set_on(tr->array_buffer.buffer)) ring_buffer_record_on(tr->max_buffer.buffer); else ring_buffer_record_off(tr->max_buffer.buffer); #ifdef CONFIG_TRACER_SNAPSHOT if (tr->cond_snapshot && !tr->cond_snapshot->update(tr, cond_data)) goto out_unlock; #endif swap(tr->array_buffer.buffer, tr->max_buffer.buffer); __update_max_tr(tr, tsk, cpu); out_unlock: arch_spin_unlock(&tr->max_lock); } /** * update_max_tr_single - only copy one trace over, and reset the rest * @tr: tracer * @tsk: task with the latency * @cpu: the cpu of the buffer to copy. * * Flip the trace of a single CPU buffer between the @tr and the max_tr. */ void update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) { int ret; if (tr->stop_count) return; WARN_ON_ONCE(!irqs_disabled()); if (!tr->allocated_snapshot) { /* Only the nop tracer should hit this when disabling */ WARN_ON_ONCE(tr->current_trace != &nop_trace); return; } arch_spin_lock(&tr->max_lock); ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->array_buffer.buffer, cpu); if (ret == -EBUSY) { /* * We failed to swap the buffer due to a commit taking * place on this CPU. We fail to record, but we reset * the max trace buffer (no one writes directly to it) * and flag that it failed. */ trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_, "Failed to swap buffers due to commit in progress\n"); } WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY); __update_max_tr(tr, tsk, cpu); arch_spin_unlock(&tr->max_lock); } #endif /* CONFIG_TRACER_MAX_TRACE */ static int wait_on_pipe(struct trace_iterator *iter, int full) { /* Iterators are static, they should be filled or empty */ if (trace_buffer_iter(iter, iter->cpu_file)) return 0; return ring_buffer_wait(iter->array_buffer->buffer, iter->cpu_file, full); } #ifdef CONFIG_FTRACE_STARTUP_TEST static bool selftests_can_run; struct trace_selftests { struct list_head list; struct tracer *type; }; static LIST_HEAD(postponed_selftests); static int save_selftest(struct tracer *type) { struct trace_selftests *selftest; selftest = kmalloc(sizeof(*selftest), GFP_KERNEL); if (!selftest) return -ENOMEM; selftest->type = type; list_add(&selftest->list, &postponed_selftests); return 0; } static int run_tracer_selftest(struct tracer *type) { struct trace_array *tr = &global_trace; struct tracer *saved_tracer = tr->current_trace; int ret; if (!type->selftest || tracing_selftest_disabled) return 0; /* * If a tracer registers early in boot up (before scheduling is * initialized and such), then do not run its selftests yet. * Instead, run it a little later in the boot process. */ if (!selftests_can_run) return save_selftest(type); /* * Run a selftest on this tracer. * Here we reset the trace buffer, and set the current * tracer to be this tracer. The tracer can then run some * internal tracing to verify that everything is in order. * If we fail, we do not register this tracer. */ tracing_reset_online_cpus(&tr->array_buffer); tr->current_trace = type; #ifdef CONFIG_TRACER_MAX_TRACE if (type->use_max_tr) { /* If we expanded the buffers, make sure the max is expanded too */ if (ring_buffer_expanded) ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size, RING_BUFFER_ALL_CPUS); tr->allocated_snapshot = true; } #endif /* the test is responsible for initializing and enabling */ pr_info("Testing tracer %s: ", type->name); ret = type->selftest(type, tr); /* the test is responsible for resetting too */ tr->current_trace = saved_tracer; if (ret) { printk(KERN_CONT "FAILED!\n"); /* Add the warning after printing 'FAILED' */ WARN_ON(1); return -1; } /* Only reset on passing, to avoid touching corrupted buffers */ tracing_reset_online_cpus(&tr->array_buffer); #ifdef CONFIG_TRACER_MAX_TRACE if (type->use_max_tr) { tr->allocated_snapshot = false; /* Shrink the max buffer again */ if (ring_buffer_expanded) ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); } #endif printk(KERN_CONT "PASSED\n"); return 0; } static __init int init_trace_selftests(void) { struct trace_selftests *p, *n; struct tracer *t, **last; int ret; selftests_can_run = true; mutex_lock(&trace_types_lock); if (list_empty(&postponed_selftests)) goto out; pr_info("Running postponed tracer tests:\n"); tracing_selftest_running = true; list_for_each_entry_safe(p, n, &postponed_selftests, list) { /* This loop can take minutes when sanitizers are enabled, so * lets make sure we allow RCU processing. */ cond_resched(); ret = run_tracer_selftest(p->type); /* If the test fails, then warn and remove from available_tracers */ if (ret < 0) { WARN(1, "tracer: %s failed selftest, disabling\n", p->type->name); last = &trace_types; for (t = trace_types; t; t = t->next) { if (t == p->type) { *last = t->next; break; } last = &t->next; } } list_del(&p->list); kfree(p); } tracing_selftest_running = false; out: mutex_unlock(&trace_types_lock); return 0; } core_initcall(init_trace_selftests); #else static inline int run_tracer_selftest(struct tracer *type) { return 0; } #endif /* CONFIG_FTRACE_STARTUP_TEST */ static void add_tracer_options(struct trace_array *tr, struct tracer *t); static void __init apply_trace_boot_options(void); /** * register_tracer - register a tracer with the ftrace system. * @type: the plugin for the tracer * * Register a new plugin tracer. */ int __init register_tracer(struct tracer *type) { struct tracer *t; int ret = 0; if (!type->name) { pr_info("Tracer must have a name\n"); return -1; } if (strlen(type->name) >= MAX_TRACER_SIZE) { pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE); return -1; } if (security_locked_down(LOCKDOWN_TRACEFS)) { pr_warn("Can not register tracer %s due to lockdown\n", type->name); return -EPERM; } mutex_lock(&trace_types_lock); tracing_selftest_running = true; for (t = trace_types; t; t = t->next) { if (strcmp(type->name, t->name) == 0) { /* already found */ pr_info("Tracer %s already registered\n", type->name); ret = -1; goto out; } } if (!type->set_flag) type->set_flag = &dummy_set_flag; if (!type->flags) { /*allocate a dummy tracer_flags*/ type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL); if (!type->flags) { ret = -ENOMEM; goto out; } type->flags->val = 0; type->flags->opts = dummy_tracer_opt; } else if (!type->flags->opts) type->flags->opts = dummy_tracer_opt; /* store the tracer for __set_tracer_option */ type->flags->trace = type; ret = run_tracer_selftest(type); if (ret < 0) goto out; type->next = trace_types; trace_types = type; add_tracer_options(&global_trace, type); out: tracing_selftest_running = false; mutex_unlock(&trace_types_lock); if (ret || !default_bootup_tracer) goto out_unlock; if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE)) goto out_unlock; printk(KERN_INFO "Starting tracer '%s'\n", type->name); /* Do we want this tracer to start on bootup? */ tracing_set_tracer(&global_trace, type->name); default_bootup_tracer = NULL; apply_trace_boot_options(); /* disable other selftests, since this will break it. */ disable_tracing_selftest("running a tracer"); out_unlock: return ret; } static void tracing_reset_cpu(struct array_buffer *buf, int cpu) { struct trace_buffer *buffer = buf->buffer; if (!buffer) return; ring_buffer_record_disable(buffer); /* Make sure all commits have finished */ synchronize_rcu(); ring_buffer_reset_cpu(buffer, cpu); ring_buffer_record_enable(buffer); } void tracing_reset_online_cpus(struct array_buffer *buf) { struct trace_buffer *buffer = buf->buffer; if (!buffer) return; ring_buffer_record_disable(buffer); /* Make sure all commits have finished */ synchronize_rcu(); buf->time_start = buffer_ftrace_now(buf, buf->cpu); ring_buffer_reset_online_cpus(buffer); ring_buffer_record_enable(buffer); } /* Must have trace_types_lock held */ void tracing_reset_all_online_cpus(void) { struct trace_array *tr; list_for_each_entry(tr, &ftrace_trace_arrays, list) { if (!tr->clear_trace) continue; tr->clear_trace = false; tracing_reset_online_cpus(&tr->array_buffer); #ifdef CONFIG_TRACER_MAX_TRACE tracing_reset_online_cpus(&tr->max_buffer); #endif } } /* * The tgid_map array maps from pid to tgid; i.e. the value stored at index i * is the tgid last observed corresponding to pid=i. */ static int *tgid_map; /* The maximum valid index into tgid_map. */ static size_t tgid_map_max; #define SAVED_CMDLINES_DEFAULT 128 #define NO_CMDLINE_MAP UINT_MAX static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED; struct saved_cmdlines_buffer { unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; unsigned *map_cmdline_to_pid; unsigned cmdline_num; int cmdline_idx; char *saved_cmdlines; }; static struct saved_cmdlines_buffer *savedcmd; static inline char *get_saved_cmdlines(int idx) { return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN]; } static inline void set_cmdline(int idx, const char *cmdline) { strncpy(get_saved_cmdlines(idx), cmdline, TASK_COMM_LEN); } static int allocate_cmdlines_buffer(unsigned int val, struct saved_cmdlines_buffer *s) { s->map_cmdline_to_pid = kmalloc_array(val, sizeof(*s->map_cmdline_to_pid), GFP_KERNEL); if (!s->map_cmdline_to_pid) return -ENOMEM; s->saved_cmdlines = kmalloc_array(TASK_COMM_LEN, val, GFP_KERNEL); if (!s->saved_cmdlines) { kfree(s->map_cmdline_to_pid); return -ENOMEM; } s->cmdline_idx = 0; s->cmdline_num = val; memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP, sizeof(s->map_pid_to_cmdline)); memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP, val * sizeof(*s->map_cmdline_to_pid)); return 0; } static int trace_create_savedcmd(void) { int ret; savedcmd = kmalloc(sizeof(*savedcmd), GFP_KERNEL); if (!savedcmd) return -ENOMEM; ret = allocate_cmdlines_buffer(SAVED_CMDLINES_DEFAULT, savedcmd); if (ret < 0) { kfree(savedcmd); savedcmd = NULL; return -ENOMEM; } return 0; } int is_tracing_stopped(void) { return global_trace.stop_count; } /** * tracing_start - quick start of the tracer * * If tracing is enabled but was stopped by tracing_stop, * this will start the tracer back up. */ void tracing_start(void) { struct trace_buffer *buffer; unsigned long flags; if (tracing_disabled) return; raw_spin_lock_irqsave(&global_trace.start_lock, flags); if (--global_trace.stop_count) { if (global_trace.stop_count < 0) { /* Someone screwed up their debugging */ WARN_ON_ONCE(1); global_trace.stop_count = 0; } goto out; } /* Prevent the buffers from switching */ arch_spin_lock(&global_trace.max_lock); buffer = global_trace.array_buffer.buffer; if (buffer) ring_buffer_record_enable(buffer); #ifdef CONFIG_TRACER_MAX_TRACE buffer = global_trace.max_buffer.buffer; if (buffer) ring_buffer_record_enable(buffer); #endif arch_spin_unlock(&global_trace.max_lock); out: raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); } static void tracing_start_tr(struct trace_array *tr) { struct trace_buffer *buffer; unsigned long flags; if (tracing_disabled) return; /* If global, we need to also start the max tracer */ if (tr->flags & TRACE_ARRAY_FL_GLOBAL) return tracing_start(); raw_spin_lock_irqsave(&tr->start_lock, flags); if (--tr->stop_count) { if (tr->stop_count < 0) { /* Someone screwed up their debugging */ WARN_ON_ONCE(1); tr->stop_count = 0; } goto out; } buffer = tr->array_buffer.buffer; if (buffer) ring_buffer_record_enable(buffer); out: raw_spin_unlock_irqrestore(&tr->start_lock, flags); } /** * tracing_stop - quick stop of the tracer * * Light weight way to stop tracing. Use in conjunction with * tracing_start. */ void tracing_stop(void) { struct trace_buffer *buffer; unsigned long flags; raw_spin_lock_irqsave(&global_trace.start_lock, flags); if (global_trace.stop_count++) goto out; /* Prevent the buffers from switching */ arch_spin_lock(&global_trace.max_lock); buffer = global_trace.array_buffer.buffer; if (buffer) ring_buffer_record_disable(buffer); #ifdef CONFIG_TRACER_MAX_TRACE buffer = global_trace.max_buffer.buffer; if (buffer) ring_buffer_record_disable(buffer); #endif arch_spin_unlock(&global_trace.max_lock); out: raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); } static void tracing_stop_tr(struct trace_array *tr) { struct trace_buffer *buffer; unsigned long flags; /* If global, we need to also stop the max tracer */ if (tr->flags & TRACE_ARRAY_FL_GLOBAL) return tracing_stop(); raw_spin_lock_irqsave(&tr->start_lock, flags); if (tr->stop_count++) goto out; buffer = tr->array_buffer.buffer; if (buffer) ring_buffer_record_disable(buffer); out: raw_spin_unlock_irqrestore(&tr->start_lock, flags); } static int trace_save_cmdline(struct task_struct *tsk) { unsigned tpid, idx; /* treat recording of idle task as a success */ if (!tsk->pid) return 1; tpid = tsk->pid & (PID_MAX_DEFAULT - 1); /* * It's not the end of the world if we don't get * the lock, but we also don't want to spin * nor do we want to disable interrupts, * so if we miss here, then better luck next time. */ if (!arch_spin_trylock(&trace_cmdline_lock)) return 0; idx = savedcmd->map_pid_to_cmdline[tpid]; if (idx == NO_CMDLINE_MAP) { idx = (savedcmd->cmdline_idx + 1) % savedcmd->cmdline_num; savedcmd->map_pid_to_cmdline[tpid] = idx; savedcmd->cmdline_idx = idx; } savedcmd->map_cmdline_to_pid[idx] = tsk->pid; set_cmdline(idx, tsk->comm); arch_spin_unlock(&trace_cmdline_lock); return 1; } static void __trace_find_cmdline(int pid, char comm[]) { unsigned map; int tpid; if (!pid) { strcpy(comm, "<idle>"); return; } if (WARN_ON_ONCE(pid < 0)) { strcpy(comm, "<XXX>"); return; } tpid = pid & (PID_MAX_DEFAULT - 1); map = savedcmd->map_pid_to_cmdline[tpid]; if (map != NO_CMDLINE_MAP) { tpid = savedcmd->map_cmdline_to_pid[map]; if (tpid == pid) { strlcpy(comm, get_saved_cmdlines(map), TASK_COMM_LEN); return; } } strcpy(comm, "<...>"); } void trace_find_cmdline(int pid, char comm[]) { preempt_disable(); arch_spin_lock(&trace_cmdline_lock); __trace_find_cmdline(pid, comm); arch_spin_unlock(&trace_cmdline_lock); preempt_enable(); } static int *trace_find_tgid_ptr(int pid) { /* * Pairs with the smp_store_release in set_tracer_flag() to ensure that * if we observe a non-NULL tgid_map then we also observe the correct * tgid_map_max. */ int *map = smp_load_acquire(&tgid_map); if (unlikely(!map || pid > tgid_map_max)) return NULL; return &map[pid]; } int trace_find_tgid(int pid) { int *ptr = trace_find_tgid_ptr(pid); return ptr ? *ptr : 0; } static int trace_save_tgid(struct task_struct *tsk) { int *ptr; /* treat recording of idle task as a success */ if (!tsk->pid) return 1; ptr = trace_find_tgid_ptr(tsk->pid); if (!ptr) return 0; *ptr = tsk->tgid; return 1; } static bool tracing_record_taskinfo_skip(int flags) { if (unlikely(!(flags & (TRACE_RECORD_CMDLINE | TRACE_RECORD_TGID)))) return true; if (!__this_cpu_read(trace_taskinfo_save)) return true; return false; } /** * tracing_record_taskinfo - record the task info of a task * * @task: task to record * @flags: TRACE_RECORD_CMDLINE for recording comm * TRACE_RECORD_TGID for recording tgid */ void tracing_record_taskinfo(struct task_struct *task, int flags) { bool done; if (tracing_record_taskinfo_skip(flags)) return; /* * Record as much task information as possible. If some fail, continue * to try to record the others. */ done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(task); done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(task); /* If recording any information failed, retry again soon. */ if (!done) return; __this_cpu_write(trace_taskinfo_save, false); } /** * tracing_record_taskinfo_sched_switch - record task info for sched_switch * * @prev: previous task during sched_switch * @next: next task during sched_switch * @flags: TRACE_RECORD_CMDLINE for recording comm * TRACE_RECORD_TGID for recording tgid */ void tracing_record_taskinfo_sched_switch(struct task_struct *prev, struct task_struct *next, int flags) { bool done; if (tracing_record_taskinfo_skip(flags)) return; /* * Record as much task information as possible. If some fail, continue * to try to record the others. */ done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(prev); done &= !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(next); done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(prev); done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(next); /* If recording any information failed, retry again soon. */ if (!done) return; __this_cpu_write(trace_taskinfo_save, false); } /* Helpers to record a specific task information */ void tracing_record_cmdline(struct task_struct *task) { tracing_record_taskinfo(task, TRACE_RECORD_CMDLINE); } void tracing_record_tgid(struct task_struct *task) { tracing_record_taskinfo(task, TRACE_RECORD_TGID); } /* * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function * simplifies those functions and keeps them in sync. */ enum print_line_t trace_handle_return(struct trace_seq *s) { return trace_seq_has_overflowed(s) ? TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED; } EXPORT_SYMBOL_GPL(trace_handle_return); void tracing_generic_entry_update(struct trace_entry *entry, unsigned short type, unsigned long flags, int pc) { struct task_struct *tsk = current; entry->preempt_count = pc & 0xff; entry->pid = (tsk) ? tsk->pid : 0; entry->type = type; entry->flags = #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | #else TRACE_FLAG_IRQS_NOSUPPORT | #endif ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | ((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) | (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) | (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0); } EXPORT_SYMBOL_GPL(tracing_generic_entry_update); struct ring_buffer_event * trace_buffer_lock_reserve(struct trace_buffer *buffer, int type, unsigned long len, unsigned long flags, int pc) { return __trace_buffer_lock_reserve(buffer, type, len, flags, pc); } DEFINE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); DEFINE_PER_CPU(int, trace_buffered_event_cnt); static int trace_buffered_event_ref; /** * trace_buffered_event_enable - enable buffering events * * When events are being filtered, it is quicker to use a temporary * buffer to write the event data into if there's a likely chance * that it will not be committed. The discard of the ring buffer * is not as fast as committing, and is much slower than copying * a commit. * * When an event is to be filtered, allocate per cpu buffers to * write the event data into, and if the event is filtered and discarded * it is simply dropped, otherwise, the entire data is to be committed * in one shot. */ void trace_buffered_event_enable(void) { struct ring_buffer_event *event; struct page *page; int cpu; WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); if (trace_buffered_event_ref++) return; for_each_tracing_cpu(cpu) { page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_NORETRY, 0); if (!page) goto failed; event = page_address(page); memset(event, 0, sizeof(*event)); per_cpu(trace_buffered_event, cpu) = event; preempt_disable(); if (cpu == smp_processor_id() && __this_cpu_read(trace_buffered_event) != per_cpu(trace_buffered_event, cpu)) WARN_ON_ONCE(1); preempt_enable(); } return; failed: trace_buffered_event_disable(); } static void enable_trace_buffered_event(void *data) { /* Probably not needed, but do it anyway */ smp_rmb(); this_cpu_dec(trace_buffered_event_cnt); } static void disable_trace_buffered_event(void *data) { this_cpu_inc(trace_buffered_event_cnt); } /** * trace_buffered_event_disable - disable buffering events * * When a filter is removed, it is faster to not use the buffered * events, and to commit directly into the ring buffer. Free up * the temp buffers when there are no more users. This requires * special synchronization with current events. */ void trace_buffered_event_disable(void) { int cpu; WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); if (WARN_ON_ONCE(!trace_buffered_event_ref)) return; if (--trace_buffered_event_ref) return; preempt_disable(); /* For each CPU, set the buffer as used. */ smp_call_function_many(tracing_buffer_mask, disable_trace_buffered_event, NULL, 1); preempt_enable(); /* Wait for all current users to finish */ synchronize_rcu(); for_each_tracing_cpu(cpu) { free_page((unsigned long)per_cpu(trace_buffered_event, cpu)); per_cpu(trace_buffered_event, cpu) = NULL; } /* * Make sure trace_buffered_event is NULL before clearing * trace_buffered_event_cnt. */ smp_wmb(); preempt_disable(); /* Do the work on each cpu */ smp_call_function_many(tracing_buffer_mask, enable_trace_buffered_event, NULL, 1); preempt_enable(); } static struct trace_buffer *temp_buffer; struct ring_buffer_event * trace_event_buffer_lock_reserve(struct trace_buffer **current_rb, struct trace_event_file *trace_file, int type, unsigned long len, unsigned long flags, int pc) { struct ring_buffer_event *entry; int val; *current_rb = trace_file->tr->array_buffer.buffer; if (!ring_buffer_time_stamp_abs(*current_rb) && (trace_file->flags & (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) && (entry = this_cpu_read(trace_buffered_event))) { /* Try to use the per cpu buffer first */ val = this_cpu_inc_return(trace_buffered_event_cnt); if ((len < (PAGE_SIZE - sizeof(*entry) - sizeof(entry->array[0]))) && val == 1) { trace_event_setup(entry, type, flags, pc); entry->array[0] = len; return entry; } this_cpu_dec(trace_buffered_event_cnt); } entry = __trace_buffer_lock_reserve(*current_rb, type, len, flags, pc); /* * If tracing is off, but we have triggers enabled * we still need to look at the event data. Use the temp_buffer * to store the trace event for the trigger to use. It's recursive * safe and will not be recorded anywhere. */ if (!entry && trace_file->flags & EVENT_FILE_FL_TRIGGER_COND) { *current_rb = temp_buffer; entry = __trace_buffer_lock_reserve(*current_rb, type, len, flags, pc); } return entry; } EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve); static DEFINE_SPINLOCK(tracepoint_iter_lock); static DEFINE_MUTEX(tracepoint_printk_mutex); static void output_printk(struct trace_event_buffer *fbuffer) { struct trace_event_call *event_call; struct trace_event_file *file; struct trace_event *event; unsigned long flags; struct trace_iterator *iter = tracepoint_print_iter; /* We should never get here if iter is NULL */ if (WARN_ON_ONCE(!iter)) return; event_call = fbuffer->trace_file->event_call; if (!event_call || !event_call->event.funcs || !event_call->event.funcs->trace) return; file = fbuffer->trace_file; if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && !filter_match_preds(file->filter, fbuffer->entry))) return; event = &fbuffer->trace_file->event_call->event; spin_lock_irqsave(&tracepoint_iter_lock, flags); trace_seq_init(&iter->seq); iter->ent = fbuffer->entry; event_call->event.funcs->trace(iter, 0, event); trace_seq_putc(&iter->seq, 0); printk("%s", iter->seq.buffer); spin_unlock_irqrestore(&tracepoint_iter_lock, flags); } int tracepoint_printk_sysctl(struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos) { int save_tracepoint_printk; int ret; mutex_lock(&tracepoint_printk_mutex); save_tracepoint_printk = tracepoint_printk; ret = proc_dointvec(table, write, buffer, lenp, ppos); /* * This will force exiting early, as tracepoint_printk * is always zero when tracepoint_printk_iter is not allocated */ if (!tracepoint_print_iter) tracepoint_printk = 0; if (save_tracepoint_printk == tracepoint_printk) goto out; if (tracepoint_printk) static_key_enable(&tracepoint_printk_key.key); else static_key_disable(&tracepoint_printk_key.key); out: mutex_unlock(&tracepoint_printk_mutex); return ret; } void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) { if (static_key_false(&tracepoint_printk_key.key)) output_printk(fbuffer); if (static_branch_unlikely(&trace_event_exports_enabled)) ftrace_exports(fbuffer->event, TRACE_EXPORT_EVENT); event_trigger_unlock_commit_regs(fbuffer->trace_file, fbuffer->buffer, fbuffer->event, fbuffer->entry, fbuffer->flags, fbuffer->pc, fbuffer->regs); } EXPORT_SYMBOL_GPL(trace_event_buffer_commit); /* * Skip 3: * * trace_buffer_unlock_commit_regs() * trace_event_buffer_commit() * trace_event_raw_event_xxx() */ # define STACK_SKIP 3 void trace_buffer_unlock_commit_regs(struct trace_array *tr, struct trace_buffer *buffer, struct ring_buffer_event *event, unsigned long flags, int pc, struct pt_regs *regs) { __buffer_unlock_commit(buffer, event); /* * If regs is not set, then skip the necessary functions. * Note, we can still get here via blktrace, wakeup tracer * and mmiotrace, but that's ok if they lose a function or * two. They are not that meaningful. */ ftrace_trace_stack(tr, buffer, flags, regs ? 0 : STACK_SKIP, pc, regs); ftrace_trace_userstack(tr, buffer, flags, pc); } /* * Similar to trace_buffer_unlock_commit_regs() but do not dump stack. */ void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, struct ring_buffer_event *event) { __buffer_unlock_commit(buffer, event); } void trace_function(struct trace_array *tr, unsigned long ip, unsigned long parent_ip, unsigned long flags, int pc) { struct trace_event_call *call = &event_function; struct trace_buffer *buffer = tr->array_buffer.buffer; struct ring_buffer_event *event; struct ftrace_entry *entry; event = __trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry), flags, pc); if (!event) return; entry = ring_buffer_event_data(event); entry->ip = ip; entry->parent_ip = parent_ip; if (!call_filter_check_discard(call, entry, buffer, event)) { if (static_branch_unlikely(&trace_function_exports_enabled)) ftrace_exports(event, TRACE_EXPORT_FUNCTION); __buffer_unlock_commit(buffer, event); } } #ifdef CONFIG_STACKTRACE /* Allow 4 levels of nesting: normal, softirq, irq, NMI */ #define FTRACE_KSTACK_NESTING 4 #define FTRACE_KSTACK_ENTRIES (PAGE_SIZE / FTRACE_KSTACK_NESTING) struct ftrace_stack { unsigned long calls[FTRACE_KSTACK_ENTRIES]; }; struct ftrace_stacks { struct ftrace_stack stacks[FTRACE_KSTACK_NESTING]; }; static DEFINE_PER_CPU(struct ftrace_stacks, ftrace_stacks); static DEFINE_PER_CPU(int, ftrace_stack_reserve); static void __ftrace_trace_stack(struct trace_buffer *buffer, unsigned long flags, int skip, int pc, struct pt_regs *regs) { struct trace_event_call *call = &event_kernel_stack; struct ring_buffer_event *event; unsigned int size, nr_entries; struct ftrace_stack *fstack; struct stack_entry *entry; int stackidx; /* * Add one, for this function and the call to save_stack_trace() * If regs is set, then these functions will not be in the way. */ #ifndef CONFIG_UNWINDER_ORC if (!regs) skip++; #endif preempt_disable_notrace(); stackidx = __this_cpu_inc_return(ftrace_stack_reserve) - 1; /* This should never happen. If it does, yell once and skip */ if (WARN_ON_ONCE(stackidx >= FTRACE_KSTACK_NESTING)) goto out; /* * The above __this_cpu_inc_return() is 'atomic' cpu local. An * interrupt will either see the value pre increment or post * increment. If the interrupt happens pre increment it will have * restored the counter when it returns. We just need a barrier to * keep gcc from moving things around. */ barrier(); fstack = this_cpu_ptr(ftrace_stacks.stacks) + stackidx; size = ARRAY_SIZE(fstack->calls); if (regs) { nr_entries = stack_trace_save_regs(regs, fstack->calls, size, skip); } else { nr_entries = stack_trace_save(fstack->calls, size, skip); } size = nr_entries * sizeof(unsigned long); event = __trace_buffer_lock_reserve(buffer, TRACE_STACK, (sizeof(*entry) - sizeof(entry->caller)) + size, flags, pc); if (!event) goto out; entry = ring_buffer_event_data(event); memcpy(&entry->caller, fstack->calls, size); entry->size = nr_entries; if (!call_filter_check_discard(call, entry, buffer, event)) __buffer_unlock_commit(buffer, event); out: /* Again, don't let gcc optimize things here */ barrier(); __this_cpu_dec(ftrace_stack_reserve); preempt_enable_notrace(); } static inline void ftrace_trace_stack(struct trace_array *tr, struct trace_buffer *buffer, unsigned long flags, int skip, int pc, struct pt_regs *regs) { if (!(tr->trace_flags & TRACE_ITER_STACKTRACE)) return; __ftrace_trace_stack(buffer, flags, skip, pc, regs); } void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, int pc) { struct trace_buffer *buffer = tr->array_buffer.buffer; if (rcu_is_watching()) { __ftrace_trace_stack(buffer, flags, skip, pc, NULL); return; } /* * When an NMI triggers, RCU is enabled via rcu_nmi_enter(), * but if the above rcu_is_watching() failed, then the NMI * triggered someplace critical, and rcu_irq_enter() should * not be called from NMI. */ if (unlikely(in_nmi())) return; rcu_irq_enter_irqson(); __ftrace_trace_stack(buffer, flags, skip, pc, NULL); rcu_irq_exit_irqson(); } /** * trace_dump_stack - record a stack back trace in the trace buffer * @skip: Number of functions to skip (helper handlers) */ void trace_dump_stack(int skip) { unsigned long flags; if (tracing_disabled || tracing_selftest_running) return; local_save_flags(flags); #ifndef CONFIG_UNWINDER_ORC /* Skip 1 to skip this function. */ skip++; #endif __ftrace_trace_stack(global_trace.array_buffer.buffer, flags, skip, preempt_count(), NULL); } EXPORT_SYMBOL_GPL(trace_dump_stack); #ifdef CONFIG_USER_STACKTRACE_SUPPORT static DEFINE_PER_CPU(int, user_stack_count); static void ftrace_trace_userstack(struct trace_array *tr, struct trace_buffer *buffer, unsigned long flags, int pc) { struct trace_event_call *call = &event_user_stack; struct ring_buffer_event *event; struct userstack_entry *entry; if (!(tr->trace_flags & TRACE_ITER_USERSTACKTRACE)) return; /* * NMIs can not handle page faults, even with fix ups. * The save user stack can (and often does) fault. */ if (unlikely(in_nmi())) return; /* * prevent recursion, since the user stack tracing may * trigger other kernel events. */ preempt_disable(); if (__this_cpu_read(user_stack_count)) goto out; __this_cpu_inc(user_stack_count); event = __trace_buffer_lock_reserve(buffer, TRACE_USER_STACK, sizeof(*entry), flags, pc); if (!event) goto out_drop_count; entry = ring_buffer_event_data(event); entry->tgid = current->tgid; memset(&entry->caller, 0, sizeof(entry->caller)); stack_trace_save_user(entry->caller, FTRACE_STACK_ENTRIES); if (!call_filter_check_discard(call, entry, buffer, event)) __buffer_unlock_commit(buffer, event); out_drop_count: __this_cpu_dec(user_stack_count); out: preempt_enable(); } #else /* CONFIG_USER_STACKTRACE_SUPPORT */ static void ftrace_trace_userstack(struct trace_array *tr, struct trace_buffer *buffer, unsigned long flags, int pc) { } #endif /* !CONFIG_USER_STACKTRACE_SUPPORT */ #endif /* CONFIG_STACKTRACE */ /* created for use with alloc_percpu */ struct trace_buffer_struct { int nesting; char buffer[4][TRACE_BUF_SIZE]; }; static struct trace_buffer_struct *trace_percpu_buffer; /* * Thise allows for lockless recording. If we're nested too deeply, then * this returns NULL. */ static char *get_trace_buf(void) { struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer); if (!buffer || buffer->nesting >= 4) return NULL; buffer->nesting++; /* Interrupts must see nesting incremented before we use the buffer */ barrier(); return &buffer->buffer[buffer->nesting - 1][0]; } static void put_trace_buf(void) { /* Don't let the decrement of nesting leak before this */ barrier(); this_cpu_dec(trace_percpu_buffer->nesting); } static int alloc_percpu_trace_buffer(void) { struct trace_buffer_struct *buffers; if (trace_percpu_buffer) return 0; buffers = alloc_percpu(struct trace_buffer_struct); if (MEM_FAIL(!buffers, "Could not allocate percpu trace_printk buffer")) return -ENOMEM; trace_percpu_buffer = buffers; return 0; } static int buffers_allocated; void trace_printk_init_buffers(void) { if (buffers_allocated) return; if (alloc_percpu_trace_buffer()) return; /* trace_printk() is for debug use only. Don't use it in production. */ pr_warn("\n"); pr_warn("**********************************************************\n"); pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); pr_warn("** **\n"); pr_warn("** trace_printk() being used. Allocating extra memory. **\n"); pr_warn("** **\n"); pr_warn("** This means that this is a DEBUG kernel and it is **\n"); pr_warn("** unsafe for production use. **\n"); pr_warn("** **\n"); pr_warn("** If you see this message and you are not debugging **\n"); pr_warn("** the kernel, report this immediately to your vendor! **\n"); pr_warn("** **\n"); pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); pr_warn("**********************************************************\n"); /* Expand the buffers to set size */ tracing_update_buffers(); buffers_allocated = 1; /* * trace_printk_init_buffers() can be called by modules. * If that happens, then we need to start cmdline recording * directly here. If the global_trace.buffer is already * allocated here, then this was called by module code. */ if (global_trace.array_buffer.buffer) tracing_start_cmdline_record(); } EXPORT_SYMBOL_GPL(trace_printk_init_buffers); void trace_printk_start_comm(void) { /* Start tracing comms if trace printk is set */ if (!buffers_allocated) return; tracing_start_cmdline_record(); } static void trace_printk_start_stop_comm(int enabled) { if (!buffers_allocated) return; if (enabled) tracing_start_cmdline_record(); else tracing_stop_cmdline_record(); } /** * trace_vbprintk - write binary msg to tracing buffer * @ip: The address of the caller * @fmt: The string format to write to the buffer * @args: Arguments for @fmt */ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args) { struct trace_event_call *call = &event_bprint; struct ring_buffer_event *event; struct trace_buffer *buffer; struct trace_array *tr = &global_trace; struct bprint_entry *entry; unsigned long flags; char *tbuffer; int len = 0, size, pc; if (unlikely(tracing_selftest_running || tracing_disabled)) return 0; /* Don't pollute graph traces with trace_vprintk internals */ pause_graph_tracing(); pc = preempt_count(); preempt_disable_notrace(); tbuffer = get_trace_buf(); if (!tbuffer) { len = 0; goto out_nobuffer; } len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args); if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0) goto out_put; local_save_flags(flags); size = sizeof(*entry) + sizeof(u32) * len; buffer = tr->array_buffer.buffer; ring_buffer_nest_start(buffer); event = __trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size, flags, pc); if (!event) goto out; entry = ring_buffer_event_data(event); entry->ip = ip; entry->fmt = fmt; memcpy(entry->buf, tbuffer, sizeof(u32) * len); if (!call_filter_check_discard(call, entry, buffer, event)) { __buffer_unlock_commit(buffer, event); ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL); } out: ring_buffer_nest_end(buffer); out_put: put_trace_buf(); out_nobuffer: preempt_enable_notrace(); unpause_graph_tracing(); return len; } EXPORT_SYMBOL_GPL(trace_vbprintk); __printf(3, 0) static int __trace_array_vprintk(struct trace_buffer *buffer, unsigned long ip, const char *fmt, va_list args) { struct trace_event_call *call = &event_print; struct ring_buffer_event *event; int len = 0, size, pc; struct print_entry *entry; unsigned long flags; char *tbuffer; if (tracing_disabled || tracing_selftest_running) return 0; /* Don't pollute graph traces with trace_vprintk internals */ pause_graph_tracing(); pc = preempt_count(); preempt_disable_notrace(); tbuffer = get_trace_buf(); if (!tbuffer) { len = 0; goto out_nobuffer; } len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args); local_save_flags(flags); size = sizeof(*entry) + len + 1; ring_buffer_nest_start(buffer); event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, flags, pc); if (!event) goto out; entry = ring_buffer_event_data(event); entry->ip = ip; memcpy(&entry->buf, tbuffer, len + 1); if (!call_filter_check_discard(call, entry, buffer, event)) { __buffer_unlock_commit(buffer, event); ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL); } out: ring_buffer_nest_end(buffer); put_trace_buf(); out_nobuffer: preempt_enable_notrace(); unpause_graph_tracing(); return len; } __printf(3, 0) int trace_array_vprintk(struct trace_array *tr, unsigned long ip, const char *fmt, va_list args) { return __trace_array_vprintk(tr->array_buffer.buffer, ip, fmt, args); } /** * trace_array_printk - Print a message to a specific instance * @tr: The instance trace_array descriptor * @ip: The instruction pointer that this is called from. * @fmt: The format to print (printf format) * * If a subsystem sets up its own instance, they have the right to * printk strings into their tracing instance buffer using this * function. Note, this function will not write into the top level * buffer (use trace_printk() for that), as writing into the top level * buffer should only have events that can be individually disabled. * trace_printk() is only used for debugging a kernel, and should not * be ever encorporated in normal use. * * trace_array_printk() can be used, as it will not add noise to the * top level tracing buffer. * * Note, trace_array_init_printk() must be called on @tr before this * can be used. */ __printf(3, 0) int trace_array_printk(struct trace_array *tr, unsigned long ip, const char *fmt, ...) { int ret; va_list ap; if (!tr) return -ENOENT; /* This is only allowed for created instances */ if (tr == &global_trace) return 0; if (!(tr->trace_flags & TRACE_ITER_PRINTK)) return 0; va_start(ap, fmt); ret = trace_array_vprintk(tr, ip, fmt, ap); va_end(ap); return ret; } EXPORT_SYMBOL_GPL(trace_array_printk); /** * trace_array_init_printk - Initialize buffers for trace_array_printk() * @tr: The trace array to initialize the buffers for * * As trace_array_printk() only writes into instances, they are OK to * have in the kernel (unlike trace_printk()). This needs to be called * before trace_array_printk() can be used on a trace_array. */ int trace_array_init_printk(struct trace_array *tr) { if (!tr) return -ENOENT; /* This is only allowed for created instances */ if (tr == &global_trace) return -EINVAL; return alloc_percpu_trace_buffer(); } EXPORT_SYMBOL_GPL(trace_array_init_printk); __printf(3, 4) int trace_array_printk_buf(struct trace_buffer *buffer, unsigned long ip, const char *fmt, ...) { int ret; va_list ap; if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) return 0; va_start(ap, fmt); ret = __trace_array_vprintk(buffer, ip, fmt, ap); va_end(ap); return ret; } __printf(2, 0) int trace_vprintk(unsigned long ip, const char *fmt, va_list args) { return trace_array_vprintk(&global_trace, ip, fmt, args); } EXPORT_SYMBOL_GPL(trace_vprintk); static void trace_iterator_increment(struct trace_iterator *iter) { struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu); iter->idx++; if (buf_iter) ring_buffer_iter_advance(buf_iter); } static struct trace_entry * peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts, unsigned long *lost_events) { struct ring_buffer_event *event; struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu); if (buf_iter) { event = ring_buffer_iter_peek(buf_iter, ts); if (lost_events) *lost_events = ring_buffer_iter_dropped(buf_iter) ? (unsigned long)-1 : 0; } else { event = ring_buffer_peek(iter->array_buffer->buffer, cpu, ts, lost_events); } if (event) { iter->ent_size = ring_buffer_event_length(event); return ring_buffer_event_data(event); } iter->ent_size = 0; return NULL; } static struct trace_entry * __find_next_entry(struct trace_iterator *iter, int *ent_cpu, unsigned long *missing_events, u64 *ent_ts) { struct trace_buffer *buffer = iter->array_buffer->buffer; struct trace_entry *ent, *next = NULL; unsigned long lost_events = 0, next_lost = 0; int cpu_file = iter->cpu_file; u64 next_ts = 0, ts; int next_cpu = -1; int next_size = 0; int cpu; /* * If we are in a per_cpu trace file, don't bother by iterating over * all cpu and peek directly. */ if (cpu_file > RING_BUFFER_ALL_CPUS) { if (ring_buffer_empty_cpu(buffer, cpu_file)) return NULL; ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events); if (ent_cpu) *ent_cpu = cpu_file; return ent; } for_each_tracing_cpu(cpu) { if (ring_buffer_empty_cpu(buffer, cpu)) continue; ent = peek_next_entry(iter, cpu, &ts, &lost_events); /* * Pick the entry with the smallest timestamp: */ if (ent && (!next || ts < next_ts)) { next = ent; next_cpu = cpu; next_ts = ts; next_lost = lost_events; next_size = iter->ent_size; } } iter->ent_size = next_size; if (ent_cpu) *ent_cpu = next_cpu; if (ent_ts) *ent_ts = next_ts; if (missing_events) *missing_events = next_lost; return next; } #define STATIC_TEMP_BUF_SIZE 128 static char static_temp_buf[STATIC_TEMP_BUF_SIZE] __aligned(4); /* Find the next real entry, without updating the iterator itself */ struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) { /* __find_next_entry will reset ent_size */ int ent_size = iter->ent_size; struct trace_entry *entry; /* * If called from ftrace_dump(), then the iter->temp buffer * will be the static_temp_buf and not created from kmalloc. * If the entry size is greater than the buffer, we can * not save it. Just return NULL in that case. This is only * used to add markers when two consecutive events' time * stamps have a large delta. See trace_print_lat_context() */ if (iter->temp == static_temp_buf && STATIC_TEMP_BUF_SIZE < ent_size) return NULL; /* * The __find_next_entry() may call peek_next_entry(), which may * call ring_buffer_peek() that may make the contents of iter->ent * undefined. Need to copy iter->ent now. */ if (iter->ent && iter->ent != iter->temp) { if ((!iter->temp || iter->temp_size < iter->ent_size) && !WARN_ON_ONCE(iter->temp == static_temp_buf)) { void *temp; temp = kmalloc(iter->ent_size, GFP_KERNEL); if (!temp) return NULL; kfree(iter->temp); iter->temp = temp; iter->temp_size = iter->ent_size; } memcpy(iter->temp, iter->ent, iter->ent_size); iter->ent = iter->temp; } entry = __find_next_entry(iter, ent_cpu, NULL, ent_ts); /* Put back the original ent_size */ iter->ent_size = ent_size; return entry; } /* Find the next real entry, and increment the iterator to the next entry */ void *trace_find_next_entry_inc(struct trace_iterator *iter) { iter->ent = __find_next_entry(iter, &iter->cpu, &iter->lost_events, &iter->ts); if (iter->ent) trace_iterator_increment(iter); return iter->ent ? iter : NULL; } static void trace_consume(struct trace_iterator *iter) { ring_buffer_consume(iter->array_buffer->buffer, iter->cpu, &iter->ts, &iter->lost_events); } static void *s_next(struct seq_file *m, void *v, loff_t *pos) { struct trace_iterator *iter = m->private; int i = (int)*pos; void *ent; WARN_ON_ONCE(iter->leftover); (*pos)++; /* can't go backwards */ if (iter->idx > i) return NULL; if (iter->idx < 0) ent = trace_find_next_entry_inc(iter); else ent = iter; while (ent && iter->idx < i) ent = trace_find_next_entry_inc(iter); iter->pos = *pos; return ent; } void tracing_iter_reset(struct trace_iterator *iter, int cpu) { struct ring_buffer_iter *buf_iter; unsigned long entries = 0; u64 ts; per_cpu_ptr(iter->array_buffer->data, cpu)->skipped_entries = 0; buf_iter = trace_buffer_iter(iter, cpu); if (!buf_iter) return; ring_buffer_iter_reset(buf_iter); /* * We could have the case with the max latency tracers * that a reset never took place on a cpu. This is evident * by the timestamp being before the start of the buffer. */ while (ring_buffer_iter_peek(buf_iter, &ts)) { if (ts >= iter->array_buffer->time_start) break; entries++; ring_buffer_iter_advance(buf_iter); } per_cpu_ptr(iter->array_buffer->data, cpu)->skipped_entries = entries; } /* * The current tracer is copied to avoid a global locking * all around. */ static void *s_start(struct seq_file *m, loff_t *pos) { struct trace_iterator *iter = m->private; struct trace_array *tr = iter->tr; int cpu_file = iter->cpu_file; void *p = NULL; loff_t l = 0; int cpu; /* * copy the tracer to avoid using a global lock all around. * iter->trace is a copy of current_trace, the pointer to the * name may be used instead of a strcmp(), as iter->trace->name * will point to the same string as current_trace->name. */ mutex_lock(&trace_types_lock); if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name)) *iter->trace = *tr->current_trace; mutex_unlock(&trace_types_lock); #ifdef CONFIG_TRACER_MAX_TRACE if (iter->snapshot && iter->trace->use_max_tr) return ERR_PTR(-EBUSY); #endif if (*pos != iter->pos) { iter->ent = NULL; iter->cpu = 0; iter->idx = -1; if (cpu_file == RING_BUFFER_ALL_CPUS) { for_each_tracing_cpu(cpu) tracing_iter_reset(iter, cpu); } else tracing_iter_reset(iter, cpu_file); iter->leftover = 0; for (p = iter; p && l < *pos; p = s_next(m, p, &l)) ; } else { /* * If we overflowed the seq_file before, then we want * to just reuse the trace_seq buffer again. */ if (iter->leftover) p = iter; else { l = *pos - 1; p = s_next(m, p, &l); } } trace_event_read_lock(); trace_access_lock(cpu_file); return p; } static void s_stop(struct seq_file *m, void *p) { struct trace_iterator *iter = m->private; #ifdef CONFIG_TRACER_MAX_TRACE if (iter->snapshot && iter->trace->use_max_tr) return; #endif trace_access_unlock(iter->cpu_file); trace_event_read_unlock(); } static void get_total_entries_cpu(struct array_buffer *buf, unsigned long *total, unsigned long *entries, int cpu) { unsigned long count; count = ring_buffer_entries_cpu(buf->buffer, cpu); /* * If this buffer has skipped entries, then we hold all * entries for the trace and we need to ignore the * ones before the time stamp. */ if (per_cpu_ptr(buf->data, cpu)->skipped_entries) { count -= per_cpu_ptr(buf->data, cpu)->skipped_entries; /* total is the same as the entries */ *total = count; } else *total = count + ring_buffer_overrun_cpu(buf->buffer, cpu); *entries = count; } static void get_total_entries(struct array_buffer *buf, unsigned long *total, unsigned long *entries) { unsigned long t, e; int cpu; *total = 0; *entries = 0; for_each_tracing_cpu(cpu) { get_total_entries_cpu(buf, &t, &e, cpu); *total += t; *entries += e; } } unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu) { unsigned long total, entries; if (!tr) tr = &global_trace; get_total_entries_cpu(&tr->array_buffer, &total, &entries, cpu); return entries; } unsigned long trace_total_entries(struct trace_array *tr) { unsigned long total, entries; if (!tr) tr = &global_trace; get_total_entries(&tr->array_buffer, &total, &entries); return entries; } static void print_lat_help_header(struct seq_file *m) { seq_puts(m, "# _------=> CPU# \n" "# / _-----=> irqs-off \n" "# | / _----=> need-resched \n" "# || / _---=> hardirq/softirq \n" "# ||| / _--=> preempt-depth \n" "# |||| / delay \n" "# cmd pid ||||| time | caller \n" "# \\ / ||||| \\ | / \n"); } static void print_event_info(struct array_buffer *buf, struct seq_file *m) { unsigned long total; unsigned long entries; get_total_entries(buf, &total, &entries); seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n", entries, total, num_online_cpus()); seq_puts(m, "#\n"); } static void print_func_help_header(struct array_buffer *buf, struct seq_file *m, unsigned int flags) { bool tgid = flags & TRACE_ITER_RECORD_TGID; print_event_info(buf, m); seq_printf(m, "# TASK-PID %s CPU# TIMESTAMP FUNCTION\n", tgid ? " TGID " : ""); seq_printf(m, "# | | %s | | |\n", tgid ? " | " : ""); } static void print_func_help_header_irq(struct array_buffer *buf, struct seq_file *m, unsigned int flags) { bool tgid = flags & TRACE_ITER_RECORD_TGID; const char *space = " "; int prec = tgid ? 12 : 2; print_event_info(buf, m); seq_printf(m, "# %.*s _-----=> irqs-off\n", prec, space); seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space); seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space); seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space); seq_printf(m, "# %.*s||| / delay\n", prec, space); seq_printf(m, "# TASK-PID %.*s CPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID "); seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | "); } void print_trace_header(struct seq_file *m, struct trace_iterator *iter) { unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK); struct array_buffer *buf = iter->array_buffer; struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu); struct tracer *type = iter->trace; unsigned long entries; unsigned long total; const char *name = "preemption"; name = type->name; get_total_entries(buf, &total, &entries); seq_printf(m, "# %s latency trace v1.1.5 on %s\n", name, UTS_RELEASE); seq_puts(m, "# -----------------------------------" "---------------------------------\n"); seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |" " (M:%s VP:%d, KP:%d, SP:%d HP:%d", nsecs_to_usecs(data->saved_latency), entries, total, buf->cpu, #if defined(CONFIG_PREEMPT_NONE) "server", #elif defined(CONFIG_PREEMPT_VOLUNTARY) "desktop", #elif defined(CONFIG_PREEMPT) "preempt", #elif defined(CONFIG_PREEMPT_RT) "preempt_rt", #else "unknown", #endif /* These are reserved for later use */ 0, 0, 0, 0); #ifdef CONFIG_SMP seq_printf(m, " #P:%d)\n", num_online_cpus()); #else seq_puts(m, ")\n"); #endif seq_puts(m, "# -----------------\n"); seq_printf(m, "# | task: %.16s-%d " "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", data->comm, data->pid, from_kuid_munged(seq_user_ns(m), data->uid), data->nice, data->policy, data->rt_priority); seq_puts(m, "# -----------------\n"); if (data->critical_start) { seq_puts(m, "# => started at: "); seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); trace_print_seq(m, &iter->seq); seq_puts(m, "\n# => ended at: "); seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); trace_print_seq(m, &iter->seq); seq_puts(m, "\n#\n"); } seq_puts(m, "#\n"); } static void test_cpu_buff_start(struct trace_iterator *iter) { struct trace_seq *s = &iter->seq; struct trace_array *tr = iter->tr; if (!(tr->trace_flags & TRACE_ITER_ANNOTATE)) return; if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) return; if (cpumask_available(iter->started) && cpumask_test_cpu(iter->cpu, iter->started)) return; if (per_cpu_ptr(iter->array_buffer->data, iter->cpu)->skipped_entries) return; if (cpumask_available(iter->started)) cpumask_set_cpu(iter->cpu, iter->started); /* Don't print started cpu buffer for the first entry of the trace */ if (iter->idx > 1) trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); } static enum print_line_t print_trace_fmt(struct trace_iterator *iter) { struct trace_array *tr = iter->tr; struct trace_seq *s = &iter->seq; unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK); struct trace_entry *entry; struct trace_event *event; entry = iter->ent; test_cpu_buff_start(iter); event = ftrace_find_event(entry->type); if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { if (iter->iter_flags & TRACE_FILE_LAT_FMT) trace_print_lat_context(iter); else trace_print_context(iter); } if (trace_seq_has_overflowed(s)) return TRACE_TYPE_PARTIAL_LINE; if (event) return event->funcs->trace(iter, sym_flags, event); trace_seq_printf(s, "Unknown type %d\n", entry->type); return trace_handle_return(s); } static enum print_line_t print_raw_fmt(struct trace_iterator *iter) { struct trace_array *tr = iter->tr; struct trace_seq *s = &iter->seq; struct trace_entry *entry; struct trace_event *event; entry = iter->ent; if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) trace_seq_printf(s, "%d %d %llu ", entry->pid, iter->cpu, iter->ts); if (trace_seq_has_overflowed(s)) return TRACE_TYPE_PARTIAL_LINE; event = ftrace_find_event(entry->type); if (event) return event->funcs->raw(iter, 0, event); trace_seq_printf(s, "%d ?\n", entry->type); return trace_handle_return(s); } static enum print_line_t print_hex_fmt(struct trace_iterator *iter) { struct trace_array *tr = iter->tr; struct trace_seq *s = &iter->seq; unsigned char newline = '\n'; struct trace_entry *entry; struct trace_event *event; entry = iter->ent; if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { SEQ_PUT_HEX_FIELD(s, entry->pid); SEQ_PUT_HEX_FIELD(s, iter->cpu); SEQ_PUT_HEX_FIELD(s, iter->ts); if (trace_seq_has_overflowed(s)) return TRACE_TYPE_PARTIAL_LINE; } event = ftrace_find_event(entry->type); if (event) { enum print_line_t ret = event->funcs->hex(iter, 0, event); if (ret != TRACE_TYPE_HANDLED) return ret; } SEQ_PUT_FIELD(s, newline); return trace_handle_return(s); } static enum print_line_t print_bin_fmt(struct trace_iterator *iter) { struct trace_array *tr = iter->tr; struct trace_seq *s = &iter->seq; struct trace_entry *entry; struct trace_event *event; entry = iter->ent; if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { SEQ_PUT_FIELD(s, entry->pid); SEQ_PUT_FIELD(s, iter->cpu); SEQ_PUT_FIELD(s, iter->ts); if (trace_seq_has_overflowed(s)) return TRACE_TYPE_PARTIAL_LINE; } event = ftrace_find_event(entry->type); return event ? event->funcs->binary(iter, 0, event) : TRACE_TYPE_HANDLED; } int trace_empty(struct trace_iterator *iter) { struct ring_buffer_iter *buf_iter; int cpu; /* If we are looking at one CPU buffer, only check that one */ if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { cpu = iter->cpu_file; buf_iter = trace_buffer_iter(iter, cpu); if (buf_iter) { if (!ring_buffer_iter_empty(buf_iter)) return 0; } else { if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu)) return 0; } return 1; } for_each_tracing_cpu(cpu) { buf_iter = trace_buffer_iter(iter, cpu); if (buf_iter) { if (!ring_buffer_iter_empty(buf_iter)) return 0; } else { if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu)) return 0; } } return 1; } /* Called with trace_event_read_lock() held. */ enum print_line_t print_trace_line(struct trace_iterator *iter) { struct trace_array *tr = iter->tr; unsigned long trace_flags = tr->trace_flags; enum print_line_t ret; if (iter->lost_events) { if (iter->lost_events == (unsigned long)-1) trace_seq_printf(&iter->seq, "CPU:%d [LOST EVENTS]\n", iter->cpu); else trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n", iter->cpu, iter->lost_events); if (trace_seq_has_overflowed(&iter->seq)) return TRACE_TYPE_PARTIAL_LINE; } if (iter->trace && iter->trace->print_line) { ret = iter->trace->print_line(iter); if (ret != TRACE_TYPE_UNHANDLED) return ret; } if (iter->ent->type == TRACE_BPUTS && trace_flags & TRACE_ITER_PRINTK && trace_flags & TRACE_ITER_PRINTK_MSGONLY) return trace_print_bputs_msg_only(iter); if (iter->ent->type == TRACE_BPRINT && trace_flags & TRACE_ITER_PRINTK && trace_flags & TRACE_ITER_PRINTK_MSGONLY) return trace_print_bprintk_msg_only(iter); if (iter->ent->type == TRACE_PRINT && trace_flags & TRACE_ITER_PRINTK && trace_flags & TRACE_ITER_PRINTK_MSGONLY) return trace_print_printk_msg_only(iter); if (trace_flags & TRACE_ITER_BIN) return print_bin_fmt(iter); if (trace_flags & TRACE_ITER_HEX) return print_hex_fmt(iter); if (trace_flags & TRACE_ITER_RAW) return print_raw_fmt(iter); return print_trace_fmt(iter); } void trace_latency_header(struct seq_file *m) { struct trace_iterator *iter = m->private; struct trace_array *tr = iter->tr; /* print nothing if the buffers are empty */ if (trace_empty(iter)) return; if (iter->iter_flags & TRACE_FILE_LAT_FMT) print_trace_header(m, iter); if (!(tr->trace_flags & TRACE_ITER_VERBOSE)) print_lat_help_header(m); } void trace_default_header(struct seq_file *m) { struct trace_iterator *iter = m->private; struct trace_array *tr = iter->tr; unsigned long trace_flags = tr->trace_flags; if (!(trace_flags & TRACE_ITER_CONTEXT_INFO)) return; if (iter->iter_flags & TRACE_FILE_LAT_FMT) { /* print nothing if the buffers are empty */ if (trace_empty(iter)) return; print_trace_header(m, iter); if (!(trace_flags & TRACE_ITER_VERBOSE)) print_lat_help_header(m); } else { if (!(trace_flags & TRACE_ITER_VERBOSE)) { if (trace_flags & TRACE_ITER_IRQ_INFO) print_func_help_header_irq(iter->array_buffer, m, trace_flags); else print_func_help_header(iter->array_buffer, m, trace_flags); } } } static void test_ftrace_alive(struct seq_file *m) { if (!ftrace_is_dead()) return; seq_puts(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n" "# MAY BE MISSING FUNCTION EVENTS\n"); } #ifdef CONFIG_TRACER_MAX_TRACE static void show_snapshot_main_help(struct seq_file *m) { seq_puts(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n" "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" "# Takes a snapshot of the main buffer.\n" "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n" "# (Doesn't have to be '2' works with any number that\n" "# is not a '0' or '1')\n"); } static void show_snapshot_percpu_help(struct seq_file *m) { seq_puts(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n"); #ifdef CONFIG_RING_BUFFER_ALLOW_SWAP seq_puts(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" "# Takes a snapshot of the main buffer for this cpu.\n"); #else seq_puts(m, "# echo 1 > snapshot : Not supported with this kernel.\n" "# Must use main snapshot file to allocate.\n"); #endif seq_puts(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n" "# (Doesn't have to be '2' works with any number that\n" "# is not a '0' or '1')\n"); } static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { if (iter->tr->allocated_snapshot) seq_puts(m, "#\n# * Snapshot is allocated *\n#\n"); else seq_puts(m, "#\n# * Snapshot is freed *\n#\n"); seq_puts(m, "# Snapshot commands:\n"); if (iter->cpu_file == RING_BUFFER_ALL_CPUS) show_snapshot_main_help(m); else show_snapshot_percpu_help(m); } #else /* Should never be called */ static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { } #endif static int s_show(struct seq_file *m, void *v) { struct trace_iterator *iter = v; int ret; if (iter->ent == NULL) { if (iter->tr) { seq_printf(m, "# tracer: %s\n", iter->trace->name); seq_puts(m, "#\n"); test_ftrace_alive(m); } if (iter->snapshot && trace_empty(iter)) print_snapshot_help(m, iter); else if (iter->trace && iter->trace->print_header) iter->trace->print_header(m); else trace_default_header(m); } else if (iter->leftover) { /* * If we filled the seq_file buffer earlier, we * want to just show it now. */ ret = trace_print_seq(m, &iter->seq); /* ret should this time be zero, but you never know */ iter->leftover = ret; } else { print_trace_line(iter); ret = trace_print_seq(m, &iter->seq); /* * If we overflow the seq_file buffer, then it will * ask us for this data again at start up. * Use that instead. * ret is 0 if seq_file write succeeded. * -1 otherwise. */ iter->leftover = ret; } return 0; } /* * Should be used after trace_array_get(), trace_types_lock * ensures that i_cdev was already initialized. */ static inline int tracing_get_cpu(struct inode *inode) { if (inode->i_cdev) /* See trace_create_cpu_file() */ return (long)inode->i_cdev - 1; return RING_BUFFER_ALL_CPUS; } static const struct seq_operations tracer_seq_ops = { .start = s_start, .next = s_next, .stop = s_stop, .show = s_show, }; static struct trace_iterator * __tracing_open(struct inode *inode, struct file *file, bool snapshot) { struct trace_array *tr = inode->i_private; struct trace_iterator *iter; int cpu; if (tracing_disabled) return ERR_PTR(-ENODEV); iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter)); if (!iter) return ERR_PTR(-ENOMEM); iter->buffer_iter = kcalloc(nr_cpu_ids, sizeof(*iter->buffer_iter), GFP_KERNEL); if (!iter->buffer_iter) goto release; /* * trace_find_next_entry() may need to save off iter->ent. * It will place it into the iter->temp buffer. As most * events are less than 128, allocate a buffer of that size. * If one is greater, then trace_find_next_entry() will * allocate a new buffer to adjust for the bigger iter->ent. * It's not critical if it fails to get allocated here. */ iter->temp = kmalloc(128, GFP_KERNEL); if (iter->temp) iter->temp_size = 128; /* * We make a copy of the current tracer to avoid concurrent * changes on it while we are reading. */ mutex_lock(&trace_types_lock); iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL); if (!iter->trace) goto fail; *iter->trace = *tr->current_trace; if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL)) goto fail; iter->tr = tr; #ifdef CONFIG_TRACER_MAX_TRACE /* Currently only the top directory has a snapshot */ if (tr->current_trace->print_max || snapshot) iter->array_buffer = &tr->max_buffer; else #endif iter->array_buffer = &tr->array_buffer; iter->snapshot = snapshot; iter->pos = -1; iter->cpu_file = tracing_get_cpu(inode); mutex_init(&iter->mutex); /* Notify the tracer early; before we stop tracing. */ if (iter->trace->open) iter->trace->open(iter); /* Annotate start of buffers if we had overruns */ if (ring_buffer_overruns(iter->array_buffer->buffer)) iter->iter_flags |= TRACE_FILE_ANNOTATE; /* Output in nanoseconds only if we are using a clock in nanoseconds. */ if (trace_clocks[tr->clock_id].in_ns) iter->iter_flags |= TRACE_FILE_TIME_IN_NS; /* * If pause-on-trace is enabled, then stop the trace while * dumping, unless this is the "snapshot" file */ if (!iter->snapshot && (tr->trace_flags & TRACE_ITER_PAUSE_ON_TRACE)) tracing_stop_tr(tr); if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { for_each_tracing_cpu(cpu) { iter->buffer_iter[cpu] = ring_buffer_read_prepare(iter->array_buffer->buffer, cpu, GFP_KERNEL); } ring_buffer_read_prepare_sync(); for_each_tracing_cpu(cpu) { ring_buffer_read_start(iter->buffer_iter[cpu]); tracing_iter_reset(iter, cpu); } } else { cpu = iter->cpu_file; iter->buffer_iter[cpu] = ring_buffer_read_prepare(iter->array_buffer->buffer, cpu, GFP_KERNEL); ring_buffer_read_prepare_sync(); ring_buffer_read_start(iter->buffer_iter[cpu]); tracing_iter_reset(iter, cpu); } mutex_unlock(&trace_types_lock); return iter; fail: mutex_unlock(&trace_types_lock); kfree(iter->trace); kfree(iter->temp); kfree(iter->buffer_iter); release: seq_release_private(inode, file); return ERR_PTR(-ENOMEM); } int tracing_open_generic(struct inode *inode, struct file *filp) { int ret; ret = tracing_check_open_get_tr(NULL); if (ret) return ret; filp->private_data = inode->i_private; return 0; } bool tracing_is_disabled(void) { return (tracing_disabled) ? true: false; } /* * Open and update trace_array ref count. * Must have the current trace_array passed to it. */ int tracing_open_generic_tr(struct inode *inode, struct file *filp) { struct trace_array *tr = inode->i_private; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; filp->private_data = inode->i_private; return 0; } static int tracing_release(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; struct seq_file *m = file->private_data; struct trace_iterator *iter; int cpu; if (!(file->f_mode & FMODE_READ)) { trace_array_put(tr); return 0; } /* Writes do not use seq_file */ iter = m->private; mutex_lock(&trace_types_lock); for_each_tracing_cpu(cpu) { if (iter->buffer_iter[cpu]) ring_buffer_read_finish(iter->buffer_iter[cpu]); } if (iter->trace && iter->trace->close) iter->trace->close(iter); if (!iter->snapshot && tr->stop_count) /* reenable tracing if it was previously enabled */ tracing_start_tr(tr); __trace_array_put(tr); mutex_unlock(&trace_types_lock); mutex_destroy(&iter->mutex); free_cpumask_var(iter->started); kfree(iter->temp); kfree(iter->trace); kfree(iter->buffer_iter); seq_release_private(inode, file); return 0; } static int tracing_release_generic_tr(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; trace_array_put(tr); return 0; } static int tracing_single_release_tr(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; trace_array_put(tr); return single_release(inode, file); } static int tracing_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; struct trace_iterator *iter; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; /* If this file was open for write, then erase contents */ if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { int cpu = tracing_get_cpu(inode); struct array_buffer *trace_buf = &tr->array_buffer; #ifdef CONFIG_TRACER_MAX_TRACE if (tr->current_trace->print_max) trace_buf = &tr->max_buffer; #endif if (cpu == RING_BUFFER_ALL_CPUS) tracing_reset_online_cpus(trace_buf); else tracing_reset_cpu(trace_buf, cpu); } if (file->f_mode & FMODE_READ) { iter = __tracing_open(inode, file, false); if (IS_ERR(iter)) ret = PTR_ERR(iter); else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) iter->iter_flags |= TRACE_FILE_LAT_FMT; } if (ret < 0) trace_array_put(tr); return ret; } /* * Some tracers are not suitable for instance buffers. * A tracer is always available for the global array (toplevel) * or if it explicitly states that it is. */ static bool trace_ok_for_array(struct tracer *t, struct trace_array *tr) { return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances; } /* Find the next tracer that this trace array may use */ static struct tracer * get_tracer_for_array(struct trace_array *tr, struct tracer *t) { while (t && !trace_ok_for_array(t, tr)) t = t->next; return t; } static void * t_next(struct seq_file *m, void *v, loff_t *pos) { struct trace_array *tr = m->private; struct tracer *t = v; (*pos)++; if (t) t = get_tracer_for_array(tr, t->next); return t; } static void *t_start(struct seq_file *m, loff_t *pos) { struct trace_array *tr = m->private; struct tracer *t; loff_t l = 0; mutex_lock(&trace_types_lock); t = get_tracer_for_array(tr, trace_types); for (; t && l < *pos; t = t_next(m, t, &l)) ; return t; } static void t_stop(struct seq_file *m, void *p) { mutex_unlock(&trace_types_lock); } static int t_show(struct seq_file *m, void *v) { struct tracer *t = v; if (!t) return 0; seq_puts(m, t->name); if (t->next) seq_putc(m, ' '); else seq_putc(m, '\n'); return 0; } static const struct seq_operations show_traces_seq_ops = { .start = t_start, .next = t_next, .stop = t_stop, .show = t_show, }; static int show_traces_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; struct seq_file *m; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; ret = seq_open(file, &show_traces_seq_ops); if (ret) { trace_array_put(tr); return ret; } m = file->private_data; m->private = tr; return 0; } static int show_traces_release(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; trace_array_put(tr); return seq_release(inode, file); } static ssize_t tracing_write_stub(struct file *filp, const char __user *ubuf, size_t count, loff_t *ppos) { return count; } loff_t tracing_lseek(struct file *file, loff_t offset, int whence) { int ret; if (file->f_mode & FMODE_READ) ret = seq_lseek(file, offset, whence); else file->f_pos = ret = 0; return ret; } static const struct file_operations tracing_fops = { .open = tracing_open, .read = seq_read, .write = tracing_write_stub, .llseek = tracing_lseek, .release = tracing_release, }; static const struct file_operations show_traces_fops = { .open = show_traces_open, .read = seq_read, .llseek = seq_lseek, .release = show_traces_release, }; static ssize_t tracing_cpumask_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos) { struct trace_array *tr = file_inode(filp)->i_private; char *mask_str; int len; len = snprintf(NULL, 0, "%*pb\n", cpumask_pr_args(tr->tracing_cpumask)) + 1; mask_str = kmalloc(len, GFP_KERNEL); if (!mask_str) return -ENOMEM; len = snprintf(mask_str, len, "%*pb\n", cpumask_pr_args(tr->tracing_cpumask)); if (len >= count) { count = -EINVAL; goto out_err; } count = simple_read_from_buffer(ubuf, count, ppos, mask_str, len); out_err: kfree(mask_str); return count; } int tracing_set_cpumask(struct trace_array *tr, cpumask_var_t tracing_cpumask_new) { int cpu; if (!tr) return -EINVAL; local_irq_disable(); arch_spin_lock(&tr->max_lock); for_each_tracing_cpu(cpu) { /* * Increase/decrease the disabled counter if we are * about to flip a bit in the cpumask: */ if (cpumask_test_cpu(cpu, tr->tracing_cpumask) && !cpumask_test_cpu(cpu, tracing_cpumask_new)) { atomic_inc(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled); ring_buffer_record_disable_cpu(tr->array_buffer.buffer, cpu); } if (!cpumask_test_cpu(cpu, tr->tracing_cpumask) && cpumask_test_cpu(cpu, tracing_cpumask_new)) { atomic_dec(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled); ring_buffer_record_enable_cpu(tr->array_buffer.buffer, cpu); } } arch_spin_unlock(&tr->max_lock); local_irq_enable(); cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new); return 0; } static ssize_t tracing_cpumask_write(struct file *filp, const char __user *ubuf, size_t count, loff_t *ppos) { struct trace_array *tr = file_inode(filp)->i_private; cpumask_var_t tracing_cpumask_new; int err; if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) return -ENOMEM; err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); if (err) goto err_free; err = tracing_set_cpumask(tr, tracing_cpumask_new); if (err) goto err_free; free_cpumask_var(tracing_cpumask_new); return count; err_free: free_cpumask_var(tracing_cpumask_new); return err; } static const struct file_operations tracing_cpumask_fops = { .open = tracing_open_generic_tr, .read = tracing_cpumask_read, .write = tracing_cpumask_write, .release = tracing_release_generic_tr, .llseek = generic_file_llseek, }; static int tracing_trace_options_show(struct seq_file *m, void *v) { struct tracer_opt *trace_opts; struct trace_array *tr = m->private; u32 tracer_flags; int i; mutex_lock(&trace_types_lock); tracer_flags = tr->current_trace->flags->val; trace_opts = tr->current_trace->flags->opts; for (i = 0; trace_options[i]; i++) { if (tr->trace_flags & (1 << i)) seq_printf(m, "%s\n", trace_options[i]); else seq_printf(m, "no%s\n", trace_options[i]); } for (i = 0; trace_opts[i].name; i++) { if (tracer_flags & trace_opts[i].bit) seq_printf(m, "%s\n", trace_opts[i].name); else seq_printf(m, "no%s\n", trace_opts[i].name); } mutex_unlock(&trace_types_lock); return 0; } static int __set_tracer_option(struct trace_array *tr, struct tracer_flags *tracer_flags, struct tracer_opt *opts, int neg) { struct tracer *trace = tracer_flags->trace; int ret; ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg); if (ret) return ret; if (neg) tracer_flags->val &= ~opts->bit; else tracer_flags->val |= opts->bit; return 0; } /* Try to assign a tracer specific option */ static int set_tracer_option(struct trace_array *tr, char *cmp, int neg) { struct tracer *trace = tr->current_trace; struct tracer_flags *tracer_flags = trace->flags; struct tracer_opt *opts = NULL; int i; for (i = 0; tracer_flags->opts[i].name; i++) { opts = &tracer_flags->opts[i]; if (strcmp(cmp, opts->name) == 0) return __set_tracer_option(tr, trace->flags, opts, neg); } return -EINVAL; } /* Some tracers require overwrite to stay enabled */ int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set) { if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set) return -1; return 0; } int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) { int *map; if ((mask == TRACE_ITER_RECORD_TGID) || (mask == TRACE_ITER_RECORD_CMD)) lockdep_assert_held(&event_mutex); /* do nothing if flag is already set */ if (!!(tr->trace_flags & mask) == !!enabled) return 0; /* Give the tracer a chance to approve the change */ if (tr->current_trace->flag_changed) if (tr->current_trace->flag_changed(tr, mask, !!enabled)) return -EINVAL; if (enabled) tr->trace_flags |= mask; else tr->trace_flags &= ~mask; if (mask == TRACE_ITER_RECORD_CMD) trace_event_enable_cmd_record(enabled); if (mask == TRACE_ITER_RECORD_TGID) { if (!tgid_map) { tgid_map_max = pid_max; map = kvcalloc(tgid_map_max + 1, sizeof(*tgid_map), GFP_KERNEL); /* * Pairs with smp_load_acquire() in * trace_find_tgid_ptr() to ensure that if it observes * the tgid_map we just allocated then it also observes * the corresponding tgid_map_max value. */ smp_store_release(&tgid_map, map); } if (!tgid_map) { tr->trace_flags &= ~TRACE_ITER_RECORD_TGID; return -ENOMEM; } trace_event_enable_tgid_record(enabled); } if (mask == TRACE_ITER_EVENT_FORK) trace_event_follow_fork(tr, enabled); if (mask == TRACE_ITER_FUNC_FORK) ftrace_pid_follow_fork(tr, enabled); if (mask == TRACE_ITER_OVERWRITE) { ring_buffer_change_overwrite(tr->array_buffer.buffer, enabled); #ifdef CONFIG_TRACER_MAX_TRACE ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled); #endif } if (mask == TRACE_ITER_PRINTK) { trace_printk_start_stop_comm(enabled); trace_printk_control(enabled); } return 0; } int trace_set_options(struct trace_array *tr, char *option) { char *cmp; int neg = 0; int ret; size_t orig_len = strlen(option); int len; cmp = strstrip(option); len = str_has_prefix(cmp, "no"); if (len) neg = 1; cmp += len; mutex_lock(&event_mutex); mutex_lock(&trace_types_lock); ret = match_string(trace_options, -1, cmp); /* If no option could be set, test the specific tracer options */ if (ret < 0) ret = set_tracer_option(tr, cmp, neg); else ret = set_tracer_flag(tr, 1 << ret, !neg); mutex_unlock(&trace_types_lock); mutex_unlock(&event_mutex); /* * If the first trailing whitespace is replaced with '\0' by strstrip, * turn it back into a space. */ if (orig_len > strlen(option)) option[strlen(option)] = ' '; return ret; } static void __init apply_trace_boot_options(void) { char *buf = trace_boot_options_buf; char *option; while (true) { option = strsep(&buf, ","); if (!option) break; if (*option) trace_set_options(&global_trace, option); /* Put back the comma to allow this to be called again */ if (buf) *(buf - 1) = ','; } } static ssize_t tracing_trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct seq_file *m = filp->private_data; struct trace_array *tr = m->private; char buf[64]; int ret; if (cnt >= sizeof(buf)) return -EINVAL; if (copy_from_user(buf, ubuf, cnt)) return -EFAULT; buf[cnt] = 0; ret = trace_set_options(tr, buf); if (ret < 0) return ret; *ppos += cnt; return cnt; } static int tracing_trace_options_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; ret = single_open(file, tracing_trace_options_show, inode->i_private); if (ret < 0) trace_array_put(tr); return ret; } static const struct file_operations tracing_iter_fops = { .open = tracing_trace_options_open, .read = seq_read, .llseek = seq_lseek, .release = tracing_single_release_tr, .write = tracing_trace_options_write, }; static const char readme_msg[] = "tracing mini-HOWTO:\n\n" "# echo 0 > tracing_on : quick way to disable tracing\n" "# echo 1 > tracing_on : quick way to re-enable tracing\n\n" " Important files:\n" " trace\t\t\t- The static contents of the buffer\n" "\t\t\t To clear the buffer write into this file: echo > trace\n" " trace_pipe\t\t- A consuming read to see the contents of the buffer\n" " current_tracer\t- function and latency tracers\n" " available_tracers\t- list of configured tracers for current_tracer\n" " error_log\t- error log for failed commands (that support it)\n" " buffer_size_kb\t- view and modify size of per cpu buffer\n" " buffer_total_size_kb - view total size of all cpu buffers\n\n" " trace_clock\t\t-change the clock used to order events\n" " local: Per cpu clock but may not be synced across CPUs\n" " global: Synced across CPUs but slows tracing down.\n" " counter: Not a clock, but just an increment\n" " uptime: Jiffy counter from time of boot\n" " perf: Same clock that perf events use\n" #ifdef CONFIG_X86_64 " x86-tsc: TSC cycle counter\n" #endif "\n timestamp_mode\t-view the mode used to timestamp events\n" " delta: Delta difference against a buffer-wide timestamp\n" " absolute: Absolute (standalone) timestamp\n" "\n trace_marker\t\t- Writes into this file writes into the kernel buffer\n" "\n trace_marker_raw\t\t- Writes into this file writes binary data into the kernel buffer\n" " tracing_cpumask\t- Limit which CPUs to trace\n" " instances\t\t- Make sub-buffers with: mkdir instances/foo\n" "\t\t\t Remove sub-buffer with rmdir\n" " trace_options\t\t- Set format or modify how tracing happens\n" "\t\t\t Disable an option by prefixing 'no' to the\n" "\t\t\t option name\n" " saved_cmdlines_size\t- echo command number in here to store comm-pid list\n" #ifdef CONFIG_DYNAMIC_FTRACE "\n available_filter_functions - list of functions that can be filtered on\n" " set_ftrace_filter\t- echo function name in here to only trace these\n" "\t\t\t functions\n" "\t accepts: func_full_name or glob-matching-pattern\n" "\t modules: Can select a group via module\n" "\t Format: :mod:<module-name>\n" "\t example: echo :mod:ext3 > set_ftrace_filter\n" "\t triggers: a command to perform when function is hit\n" "\t Format: <function>:<trigger>[:count]\n" "\t trigger: traceon, traceoff\n" "\t\t enable_event:<system>:<event>\n" "\t\t disable_event:<system>:<event>\n" #ifdef CONFIG_STACKTRACE "\t\t stacktrace\n" #endif #ifdef CONFIG_TRACER_SNAPSHOT "\t\t snapshot\n" #endif "\t\t dump\n" "\t\t cpudump\n" "\t example: echo do_fault:traceoff > set_ftrace_filter\n" "\t echo do_trap:traceoff:3 > set_ftrace_filter\n" "\t The first one will disable tracing every time do_fault is hit\n" "\t The second will disable tracing at most 3 times when do_trap is hit\n" "\t The first time do trap is hit and it disables tracing, the\n" "\t counter will decrement to 2. If tracing is already disabled,\n" "\t the counter will not decrement. It only decrements when the\n" "\t trigger did work\n" "\t To remove trigger without count:\n" "\t echo '!<function>:<trigger> > set_ftrace_filter\n" "\t To remove trigger with a count:\n" "\t echo '!<function>:<trigger>:0 > set_ftrace_filter\n" " set_ftrace_notrace\t- echo function name in here to never trace.\n" "\t accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" "\t modules: Can select a group via module command :mod:\n" "\t Does not accept triggers\n" #endif /* CONFIG_DYNAMIC_FTRACE */ #ifdef CONFIG_FUNCTION_TRACER " set_ftrace_pid\t- Write pid(s) to only function trace those pids\n" "\t\t (function)\n" " set_ftrace_notrace_pid\t- Write pid(s) to not function trace those pids\n" "\t\t (function)\n" #endif #ifdef CONFIG_FUNCTION_GRAPH_TRACER " set_graph_function\t- Trace the nested calls of a function (function_graph)\n" " set_graph_notrace\t- Do not trace the nested calls of a function (function_graph)\n" " max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n" #endif #ifdef CONFIG_TRACER_SNAPSHOT "\n snapshot\t\t- Like 'trace' but shows the content of the static\n" "\t\t\t snapshot buffer. Read the contents for more\n" "\t\t\t information\n" #endif #ifdef CONFIG_STACK_TRACER " stack_trace\t\t- Shows the max stack trace when active\n" " stack_max_size\t- Shows current max stack size that was traced\n" "\t\t\t Write into this file to reset the max size (trigger a\n" "\t\t\t new trace)\n" #ifdef CONFIG_DYNAMIC_FTRACE " stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace\n" "\t\t\t traces\n" #endif #endif /* CONFIG_STACK_TRACER */ #ifdef CONFIG_DYNAMIC_EVENTS " dynamic_events\t\t- Create/append/remove/show the generic dynamic events\n" "\t\t\t Write into this file to define/undefine new trace events.\n" #endif #ifdef CONFIG_KPROBE_EVENTS " kprobe_events\t\t- Create/append/remove/show the kernel dynamic events\n" "\t\t\t Write into this file to define/undefine new trace events.\n" #endif #ifdef CONFIG_UPROBE_EVENTS " uprobe_events\t\t- Create/append/remove/show the userspace dynamic events\n" "\t\t\t Write into this file to define/undefine new trace events.\n" #endif #if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS) "\t accepts: event-definitions (one definition per line)\n" "\t Format: p[:[<group>/]<event>] <place> [<args>]\n" "\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n" #ifdef CONFIG_HIST_TRIGGERS "\t s:[synthetic/]<event> <field> [<field>]\n" #endif "\t -:[<group>/]<event>\n" #ifdef CONFIG_KPROBE_EVENTS "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" "place (kretprobe): [<module>:]<symbol>[+<offset>]%return|<memaddr>\n" #endif #ifdef CONFIG_UPROBE_EVENTS " place (uprobe): <path>:<offset>[%return][(ref_ctr_offset)]\n" #endif "\t args: <name>=fetcharg[:type]\n" "\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n" #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API "\t $stack<index>, $stack, $retval, $comm, $arg<N>,\n" #else "\t $stack<index>, $stack, $retval, $comm,\n" #endif "\t +|-[u]<offset>(<fetcharg>), \\imm-value, \\\"imm-string\"\n" "\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n" "\t b<bit-width>@<bit-offset>/<container-size>, ustring,\n" "\t <type>\\[<array-size>\\]\n" #ifdef CONFIG_HIST_TRIGGERS "\t field: <stype> <name>;\n" "\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n" "\t [unsigned] char/int/long\n" #endif #endif " events/\t\t- Directory containing all trace event subsystems:\n" " enable\t\t- Write 0/1 to enable/disable tracing of all events\n" " events/<system>/\t- Directory containing all trace events for <system>:\n" " enable\t\t- Write 0/1 to enable/disable tracing of all <system>\n" "\t\t\t events\n" " filter\t\t- If set, only events passing filter are traced\n" " events/<system>/<event>/\t- Directory containing control files for\n" "\t\t\t <event>:\n" " enable\t\t- Write 0/1 to enable/disable tracing of <event>\n" " filter\t\t- If set, only events passing filter are traced\n" " trigger\t\t- If set, a command to perform when event is hit\n" "\t Format: <trigger>[:count][if <filter>]\n" "\t trigger: traceon, traceoff\n" "\t enable_event:<system>:<event>\n" "\t disable_event:<system>:<event>\n" #ifdef CONFIG_HIST_TRIGGERS "\t enable_hist:<system>:<event>\n" "\t disable_hist:<system>:<event>\n" #endif #ifdef CONFIG_STACKTRACE "\t\t stacktrace\n" #endif #ifdef CONFIG_TRACER_SNAPSHOT "\t\t snapshot\n" #endif #ifdef CONFIG_HIST_TRIGGERS "\t\t hist (see below)\n" #endif "\t example: echo traceoff > events/block/block_unplug/trigger\n" "\t echo traceoff:3 > events/block/block_unplug/trigger\n" "\t echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n" "\t events/block/block_unplug/trigger\n" "\t The first disables tracing every time block_unplug is hit.\n" "\t The second disables tracing the first 3 times block_unplug is hit.\n" "\t The third enables the kmalloc event the first 3 times block_unplug\n" "\t is hit and has value of greater than 1 for the 'nr_rq' event field.\n" "\t Like function triggers, the counter is only decremented if it\n" "\t enabled or disabled tracing.\n" "\t To remove a trigger without a count:\n" "\t echo '!<trigger> > <system>/<event>/trigger\n" "\t To remove a trigger with a count:\n" "\t echo '!<trigger>:0 > <system>/<event>/trigger\n" "\t Filters can be ignored when removing a trigger.\n" #ifdef CONFIG_HIST_TRIGGERS " hist trigger\t- If set, event hits are aggregated into a hash table\n" "\t Format: hist:keys=<field1[,field2,...]>\n" "\t [:values=<field1[,field2,...]>]\n" "\t [:sort=<field1[,field2,...]>]\n" "\t [:size=#entries]\n" "\t [:pause][:continue][:clear]\n" "\t [:name=histname1]\n" "\t [:<handler>.<action>]\n" "\t [if <filter>]\n\n" "\t Note, special fields can be used as well:\n" "\t common_timestamp - to record current timestamp\n" "\t common_cpu - to record the CPU the event happened on\n" "\n" "\t When a matching event is hit, an entry is added to a hash\n" "\t table using the key(s) and value(s) named, and the value of a\n" "\t sum called 'hitcount' is incremented. Keys and values\n" "\t correspond to fields in the event's format description. Keys\n" "\t can be any field, or the special string 'stacktrace'.\n" "\t Compound keys consisting of up to two fields can be specified\n" "\t by the 'keys' keyword. Values must correspond to numeric\n" "\t fields. Sort keys consisting of up to two fields can be\n" "\t specified using the 'sort' keyword. The sort direction can\n" "\t be modified by appending '.descending' or '.ascending' to a\n" "\t sort field. The 'size' parameter can be used to specify more\n" "\t or fewer than the default 2048 entries for the hashtable size.\n" "\t If a hist trigger is given a name using the 'name' parameter,\n" "\t its histogram data will be shared with other triggers of the\n" "\t same name, and trigger hits will update this common data.\n\n" "\t Reading the 'hist' file for the event will dump the hash\n" "\t table in its entirety to stdout. If there are multiple hist\n" "\t triggers attached to an event, there will be a table for each\n" "\t trigger in the output. The table displayed for a named\n" "\t trigger will be the same as any other instance having the\n" "\t same name. The default format used to display a given field\n" "\t can be modified by appending any of the following modifiers\n" "\t to the field name, as applicable:\n\n" "\t .hex display a number as a hex value\n" "\t .sym display an address as a symbol\n" "\t .sym-offset display an address as a symbol and offset\n" "\t .execname display a common_pid as a program name\n" "\t .syscall display a syscall id as a syscall name\n" "\t .log2 display log2 value rather than raw number\n" "\t .usecs display a common_timestamp in microseconds\n\n" "\t The 'pause' parameter can be used to pause an existing hist\n" "\t trigger or to start a hist trigger but not log any events\n" "\t until told to do so. 'continue' can be used to start or\n" "\t restart a paused hist trigger.\n\n" "\t The 'clear' parameter will clear the contents of a running\n" "\t hist trigger and leave its current paused/active state\n" "\t unchanged.\n\n" "\t The enable_hist and disable_hist triggers can be used to\n" "\t have one event conditionally start and stop another event's\n" "\t already-attached hist trigger. The syntax is analogous to\n" "\t the enable_event and disable_event triggers.\n\n" "\t Hist trigger handlers and actions are executed whenever a\n" "\t a histogram entry is added or updated. They take the form:\n\n" "\t <handler>.<action>\n\n" "\t The available handlers are:\n\n" "\t onmatch(matching.event) - invoke on addition or update\n" "\t onmax(var) - invoke if var exceeds current max\n" "\t onchange(var) - invoke action if var changes\n\n" "\t The available actions are:\n\n" "\t trace(<synthetic_event>,param list) - generate synthetic event\n" "\t save(field,...) - save current event fields\n" #ifdef CONFIG_TRACER_SNAPSHOT "\t snapshot() - snapshot the trace buffer\n\n" #endif #ifdef CONFIG_SYNTH_EVENTS " events/synthetic_events\t- Create/append/remove/show synthetic events\n" "\t Write into this file to define/undefine new synthetic events.\n" "\t example: echo 'myevent u64 lat; char name[]' >> synthetic_events\n" #endif #endif ; static ssize_t tracing_readme_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { return simple_read_from_buffer(ubuf, cnt, ppos, readme_msg, strlen(readme_msg)); } static const struct file_operations tracing_readme_fops = { .open = tracing_open_generic, .read = tracing_readme_read, .llseek = generic_file_llseek, }; static void *saved_tgids_next(struct seq_file *m, void *v, loff_t *pos) { int pid = ++(*pos); return trace_find_tgid_ptr(pid); } static void *saved_tgids_start(struct seq_file *m, loff_t *pos) { int pid = *pos; return trace_find_tgid_ptr(pid); } static void saved_tgids_stop(struct seq_file *m, void *v) { } static int saved_tgids_show(struct seq_file *m, void *v) { int *entry = (int *)v; int pid = entry - tgid_map; int tgid = *entry; if (tgid == 0) return SEQ_SKIP; seq_printf(m, "%d %d\n", pid, tgid); return 0; } static const struct seq_operations tracing_saved_tgids_seq_ops = { .start = saved_tgids_start, .stop = saved_tgids_stop, .next = saved_tgids_next, .show = saved_tgids_show, }; static int tracing_saved_tgids_open(struct inode *inode, struct file *filp) { int ret; ret = tracing_check_open_get_tr(NULL); if (ret) return ret; return seq_open(filp, &tracing_saved_tgids_seq_ops); } static const struct file_operations tracing_saved_tgids_fops = { .open = tracing_saved_tgids_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos) { unsigned int *ptr = v; if (*pos || m->count) ptr++; (*pos)++; for (; ptr < &savedcmd->map_cmdline_to_pid[savedcmd->cmdline_num]; ptr++) { if (*ptr == -1 || *ptr == NO_CMDLINE_MAP) continue; return ptr; } return NULL; } static void *saved_cmdlines_start(struct seq_file *m, loff_t *pos) { void *v; loff_t l = 0; preempt_disable(); arch_spin_lock(&trace_cmdline_lock); v = &savedcmd->map_cmdline_to_pid[0]; while (l <= *pos) { v = saved_cmdlines_next(m, v, &l); if (!v) return NULL; } return v; } static void saved_cmdlines_stop(struct seq_file *m, void *v) { arch_spin_unlock(&trace_cmdline_lock); preempt_enable(); } static int saved_cmdlines_show(struct seq_file *m, void *v) { char buf[TASK_COMM_LEN]; unsigned int *pid = v; __trace_find_cmdline(*pid, buf); seq_printf(m, "%d %s\n", *pid, buf); return 0; } static const struct seq_operations tracing_saved_cmdlines_seq_ops = { .start = saved_cmdlines_start, .next = saved_cmdlines_next, .stop = saved_cmdlines_stop, .show = saved_cmdlines_show, }; static int tracing_saved_cmdlines_open(struct inode *inode, struct file *filp) { int ret; ret = tracing_check_open_get_tr(NULL); if (ret) return ret; return seq_open(filp, &tracing_saved_cmdlines_seq_ops); } static const struct file_operations tracing_saved_cmdlines_fops = { .open = tracing_saved_cmdlines_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static ssize_t tracing_saved_cmdlines_size_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { char buf[64]; int r; arch_spin_lock(&trace_cmdline_lock); r = scnprintf(buf, sizeof(buf), "%u\n", savedcmd->cmdline_num); arch_spin_unlock(&trace_cmdline_lock); return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } static void free_saved_cmdlines_buffer(struct saved_cmdlines_buffer *s) { kfree(s->saved_cmdlines); kfree(s->map_cmdline_to_pid); kfree(s); } static int tracing_resize_saved_cmdlines(unsigned int val) { struct saved_cmdlines_buffer *s, *savedcmd_temp; s = kmalloc(sizeof(*s), GFP_KERNEL); if (!s) return -ENOMEM; if (allocate_cmdlines_buffer(val, s) < 0) { kfree(s); return -ENOMEM; } arch_spin_lock(&trace_cmdline_lock); savedcmd_temp = savedcmd; savedcmd = s; arch_spin_unlock(&trace_cmdline_lock); free_saved_cmdlines_buffer(savedcmd_temp); return 0; } static ssize_t tracing_saved_cmdlines_size_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { unsigned long val; int ret; ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; /* must have at least 1 entry or less than PID_MAX_DEFAULT */ if (!val || val > PID_MAX_DEFAULT) return -EINVAL; ret = tracing_resize_saved_cmdlines((unsigned int)val); if (ret < 0) return ret; *ppos += cnt; return cnt; } static const struct file_operations tracing_saved_cmdlines_size_fops = { .open = tracing_open_generic, .read = tracing_saved_cmdlines_size_read, .write = tracing_saved_cmdlines_size_write, }; #ifdef CONFIG_TRACE_EVAL_MAP_FILE static union trace_eval_map_item * update_eval_map(union trace_eval_map_item *ptr) { if (!ptr->map.eval_string) { if (ptr->tail.next) { ptr = ptr->tail.next; /* Set ptr to the next real item (skip head) */ ptr++; } else return NULL; } return ptr; } static void *eval_map_next(struct seq_file *m, void *v, loff_t *pos) { union trace_eval_map_item *ptr = v; /* * Paranoid! If ptr points to end, we don't want to increment past it. * This really should never happen. */ (*pos)++; ptr = update_eval_map(ptr); if (WARN_ON_ONCE(!ptr)) return NULL; ptr++; ptr = update_eval_map(ptr); return ptr; } static void *eval_map_start(struct seq_file *m, loff_t *pos) { union trace_eval_map_item *v; loff_t l = 0; mutex_lock(&trace_eval_mutex); v = trace_eval_maps; if (v) v++; while (v && l < *pos) { v = eval_map_next(m, v, &l); } return v; } static void eval_map_stop(struct seq_file *m, void *v) { mutex_unlock(&trace_eval_mutex); } static int eval_map_show(struct seq_file *m, void *v) { union trace_eval_map_item *ptr = v; seq_printf(m, "%s %ld (%s)\n", ptr->map.eval_string, ptr->map.eval_value, ptr->map.system); return 0; } static const struct seq_operations tracing_eval_map_seq_ops = { .start = eval_map_start, .next = eval_map_next, .stop = eval_map_stop, .show = eval_map_show, }; static int tracing_eval_map_open(struct inode *inode, struct file *filp) { int ret; ret = tracing_check_open_get_tr(NULL); if (ret) return ret; return seq_open(filp, &tracing_eval_map_seq_ops); } static const struct file_operations tracing_eval_map_fops = { .open = tracing_eval_map_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static inline union trace_eval_map_item * trace_eval_jmp_to_tail(union trace_eval_map_item *ptr) { /* Return tail of array given the head */ return ptr + ptr->head.length + 1; } static void trace_insert_eval_map_file(struct module *mod, struct trace_eval_map **start, int len) { struct trace_eval_map **stop; struct trace_eval_map **map; union trace_eval_map_item *map_array; union trace_eval_map_item *ptr; stop = start + len; /* * The trace_eval_maps contains the map plus a head and tail item, * where the head holds the module and length of array, and the * tail holds a pointer to the next list. */ map_array = kmalloc_array(len + 2, sizeof(*map_array), GFP_KERNEL); if (!map_array) { pr_warn("Unable to allocate trace eval mapping\n"); return; } mutex_lock(&trace_eval_mutex); if (!trace_eval_maps) trace_eval_maps = map_array; else { ptr = trace_eval_maps; for (;;) { ptr = trace_eval_jmp_to_tail(ptr); if (!ptr->tail.next) break; ptr = ptr->tail.next; } ptr->tail.next = map_array; } map_array->head.mod = mod; map_array->head.length = len; map_array++; for (map = start; (unsigned long)map < (unsigned long)stop; map++) { map_array->map = **map; map_array++; } memset(map_array, 0, sizeof(*map_array)); mutex_unlock(&trace_eval_mutex); } static void trace_create_eval_file(struct dentry *d_tracer) { trace_create_file("eval_map", 0444, d_tracer, NULL, &tracing_eval_map_fops); } #else /* CONFIG_TRACE_EVAL_MAP_FILE */ static inline void trace_create_eval_file(struct dentry *d_tracer) { } static inline void trace_insert_eval_map_file(struct module *mod, struct trace_eval_map **start, int len) { } #endif /* !CONFIG_TRACE_EVAL_MAP_FILE */ static void trace_insert_eval_map(struct module *mod, struct trace_eval_map **start, int len) { struct trace_eval_map **map; if (len <= 0) return; map = start; trace_event_eval_update(map, len); trace_insert_eval_map_file(mod, start, len); } static ssize_t tracing_set_trace_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; char buf[MAX_TRACER_SIZE+2]; int r; mutex_lock(&trace_types_lock); r = sprintf(buf, "%s\n", tr->current_trace->name); mutex_unlock(&trace_types_lock); return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } int tracer_init(struct tracer *t, struct trace_array *tr) { tracing_reset_online_cpus(&tr->array_buffer); return t->init(tr); } static void set_buffer_entries(struct array_buffer *buf, unsigned long val) { int cpu; for_each_tracing_cpu(cpu) per_cpu_ptr(buf->data, cpu)->entries = val; } #ifdef CONFIG_TRACER_MAX_TRACE /* resize @tr's buffer to the size of @size_tr's entries */ static int resize_buffer_duplicate_size(struct array_buffer *trace_buf, struct array_buffer *size_buf, int cpu_id) { int cpu, ret = 0; if (cpu_id == RING_BUFFER_ALL_CPUS) { for_each_tracing_cpu(cpu) { ret = ring_buffer_resize(trace_buf->buffer, per_cpu_ptr(size_buf->data, cpu)->entries, cpu); if (ret < 0) break; per_cpu_ptr(trace_buf->data, cpu)->entries = per_cpu_ptr(size_buf->data, cpu)->entries; } } else { ret = ring_buffer_resize(trace_buf->buffer, per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id); if (ret == 0) per_cpu_ptr(trace_buf->data, cpu_id)->entries = per_cpu_ptr(size_buf->data, cpu_id)->entries; } return ret; } #endif /* CONFIG_TRACER_MAX_TRACE */ static int __tracing_resize_ring_buffer(struct trace_array *tr, unsigned long size, int cpu) { int ret; /* * If kernel or user changes the size of the ring buffer * we use the size that was given, and we can forget about * expanding it later. */ ring_buffer_expanded = true; /* May be called before buffers are initialized */ if (!tr->array_buffer.buffer) return 0; ret = ring_buffer_resize(tr->array_buffer.buffer, size, cpu); if (ret < 0) return ret; #ifdef CONFIG_TRACER_MAX_TRACE if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) || !tr->current_trace->use_max_tr) goto out; ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu); if (ret < 0) { int r = resize_buffer_duplicate_size(&tr->array_buffer, &tr->array_buffer, cpu); if (r < 0) { /* * AARGH! We are left with different * size max buffer!!!! * The max buffer is our "snapshot" buffer. * When a tracer needs a snapshot (one of the * latency tracers), it swaps the max buffer * with the saved snap shot. We succeeded to * update the size of the main buffer, but failed to * update the size of the max buffer. But when we tried * to reset the main buffer to the original size, we * failed there too. This is very unlikely to * happen, but if it does, warn and kill all * tracing. */ WARN_ON(1); tracing_disabled = 1; } return ret; } if (cpu == RING_BUFFER_ALL_CPUS) set_buffer_entries(&tr->max_buffer, size); else per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size; out: #endif /* CONFIG_TRACER_MAX_TRACE */ if (cpu == RING_BUFFER_ALL_CPUS) set_buffer_entries(&tr->array_buffer, size); else per_cpu_ptr(tr->array_buffer.data, cpu)->entries = size; return ret; } ssize_t tracing_resize_ring_buffer(struct trace_array *tr, unsigned long size, int cpu_id) { int ret = size; mutex_lock(&trace_types_lock); if (cpu_id != RING_BUFFER_ALL_CPUS) { /* make sure, this cpu is enabled in the mask */ if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) { ret = -EINVAL; goto out; } } ret = __tracing_resize_ring_buffer(tr, size, cpu_id); if (ret < 0) ret = -ENOMEM; out: mutex_unlock(&trace_types_lock); return ret; } /** * tracing_update_buffers - used by tracing facility to expand ring buffers * * To save on memory when the tracing is never used on a system with it * configured in. The ring buffers are set to a minimum size. But once * a user starts to use the tracing facility, then they need to grow * to their default size. * * This function is to be called when a tracer is about to be used. */ int tracing_update_buffers(void) { int ret = 0; mutex_lock(&trace_types_lock); if (!ring_buffer_expanded) ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size, RING_BUFFER_ALL_CPUS); mutex_unlock(&trace_types_lock); return ret; } struct trace_option_dentry; static void create_trace_option_files(struct trace_array *tr, struct tracer *tracer); /* * Used to clear out the tracer before deletion of an instance. * Must have trace_types_lock held. */ static void tracing_set_nop(struct trace_array *tr) { if (tr->current_trace == &nop_trace) return; tr->current_trace->enabled--; if (tr->current_trace->reset) tr->current_trace->reset(tr); tr->current_trace = &nop_trace; } static void add_tracer_options(struct trace_array *tr, struct tracer *t) { /* Only enable if the directory has been created already. */ if (!tr->dir) return; create_trace_option_files(tr, t); } int tracing_set_tracer(struct trace_array *tr, const char *buf) { struct tracer *t; #ifdef CONFIG_TRACER_MAX_TRACE bool had_max_tr; #endif int ret = 0; mutex_lock(&trace_types_lock); if (!ring_buffer_expanded) { ret = __tracing_resize_ring_buffer(tr, trace_buf_size, RING_BUFFER_ALL_CPUS); if (ret < 0) goto out; ret = 0; } for (t = trace_types; t; t = t->next) { if (strcmp(t->name, buf) == 0) break; } if (!t) { ret = -EINVAL; goto out; } if (t == tr->current_trace) goto out; #ifdef CONFIG_TRACER_SNAPSHOT if (t->use_max_tr) { arch_spin_lock(&tr->max_lock); if (tr->cond_snapshot) ret = -EBUSY; arch_spin_unlock(&tr->max_lock); if (ret) goto out; } #endif /* Some tracers won't work on kernel command line */ if (system_state < SYSTEM_RUNNING && t->noboot) { pr_warn("Tracer '%s' is not allowed on command line, ignored\n", t->name); goto out; } /* Some tracers are only allowed for the top level buffer */ if (!trace_ok_for_array(t, tr)) { ret = -EINVAL; goto out; } /* If trace pipe files are being read, we can't change the tracer */ if (tr->trace_ref) { ret = -EBUSY; goto out; } trace_branch_disable(); tr->current_trace->enabled--; if (tr->current_trace->reset) tr->current_trace->reset(tr); /* Current trace needs to be nop_trace before synchronize_rcu */ tr->current_trace = &nop_trace; #ifdef CONFIG_TRACER_MAX_TRACE had_max_tr = tr->allocated_snapshot; if (had_max_tr && !t->use_max_tr) { /* * We need to make sure that the update_max_tr sees that * current_trace changed to nop_trace to keep it from * swapping the buffers after we resize it. * The update_max_tr is called from interrupts disabled * so a synchronized_sched() is sufficient. */ synchronize_rcu(); free_snapshot(tr); } #endif #ifdef CONFIG_TRACER_MAX_TRACE if (t->use_max_tr && !had_max_tr) { ret = tracing_alloc_snapshot_instance(tr); if (ret < 0) goto out; } #endif if (t->init) { ret = tracer_init(t, tr); if (ret) goto out; } tr->current_trace = t; tr->current_trace->enabled++; trace_branch_enable(tr); out: mutex_unlock(&trace_types_lock); return ret; } static ssize_t tracing_set_trace_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; char buf[MAX_TRACER_SIZE+1]; int i; size_t ret; int err; ret = cnt; if (cnt > MAX_TRACER_SIZE) cnt = MAX_TRACER_SIZE; if (copy_from_user(buf, ubuf, cnt)) return -EFAULT; buf[cnt] = 0; /* strip ending whitespace. */ for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) buf[i] = 0; err = tracing_set_tracer(tr, buf); if (err) return err; *ppos += ret; return ret; } static ssize_t tracing_nsecs_read(unsigned long *ptr, char __user *ubuf, size_t cnt, loff_t *ppos) { char buf[64]; int r; r = snprintf(buf, sizeof(buf), "%ld\n", *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); if (r > sizeof(buf)) r = sizeof(buf); return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } static ssize_t tracing_nsecs_write(unsigned long *ptr, const char __user *ubuf, size_t cnt, loff_t *ppos) { unsigned long val; int ret; ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; *ptr = val * 1000; return cnt; } static ssize_t tracing_thresh_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { return tracing_nsecs_read(&tracing_thresh, ubuf, cnt, ppos); } static ssize_t tracing_thresh_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; int ret; mutex_lock(&trace_types_lock); ret = tracing_nsecs_write(&tracing_thresh, ubuf, cnt, ppos); if (ret < 0) goto out; if (tr->current_trace->update_thresh) { ret = tr->current_trace->update_thresh(tr); if (ret < 0) goto out; } ret = cnt; out: mutex_unlock(&trace_types_lock); return ret; } #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) static ssize_t tracing_max_lat_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { return tracing_nsecs_read(filp->private_data, ubuf, cnt, ppos); } static ssize_t tracing_max_lat_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos); } #endif static int tracing_open_pipe(struct inode *inode, struct file *filp) { struct trace_array *tr = inode->i_private; struct trace_iterator *iter; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; mutex_lock(&trace_types_lock); /* create a buffer to store the information to pass to userspace */ iter = kzalloc(sizeof(*iter), GFP_KERNEL); if (!iter) { ret = -ENOMEM; __trace_array_put(tr); goto out; } trace_seq_init(&iter->seq); iter->trace = tr->current_trace; if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { ret = -ENOMEM; goto fail; } /* trace pipe does not show start of buffer */ cpumask_setall(iter->started); if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) iter->iter_flags |= TRACE_FILE_LAT_FMT; /* Output in nanoseconds only if we are using a clock in nanoseconds. */ if (trace_clocks[tr->clock_id].in_ns) iter->iter_flags |= TRACE_FILE_TIME_IN_NS; iter->tr = tr; iter->array_buffer = &tr->array_buffer; iter->cpu_file = tracing_get_cpu(inode); mutex_init(&iter->mutex); filp->private_data = iter; if (iter->trace->pipe_open) iter->trace->pipe_open(iter); nonseekable_open(inode, filp); tr->trace_ref++; out: mutex_unlock(&trace_types_lock); return ret; fail: kfree(iter); __trace_array_put(tr); mutex_unlock(&trace_types_lock); return ret; } static int tracing_release_pipe(struct inode *inode, struct file *file) { struct trace_iterator *iter = file->private_data; struct trace_array *tr = inode->i_private; mutex_lock(&trace_types_lock); tr->trace_ref--; if (iter->trace->pipe_close) iter->trace->pipe_close(iter); mutex_unlock(&trace_types_lock); free_cpumask_var(iter->started); mutex_destroy(&iter->mutex); kfree(iter); trace_array_put(tr); return 0; } static __poll_t trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table) { struct trace_array *tr = iter->tr; /* Iterators are static, they should be filled or empty */ if (trace_buffer_iter(iter, iter->cpu_file)) return EPOLLIN | EPOLLRDNORM; if (tr->trace_flags & TRACE_ITER_BLOCK) /* * Always select as readable when in blocking mode */ return EPOLLIN | EPOLLRDNORM; else return ring_buffer_poll_wait(iter->array_buffer->buffer, iter->cpu_file, filp, poll_table); } static __poll_t tracing_poll_pipe(struct file *filp, poll_table *poll_table) { struct trace_iterator *iter = filp->private_data; return trace_poll(iter, filp, poll_table); } /* Must be called with iter->mutex held. */ static int tracing_wait_pipe(struct file *filp) { struct trace_iterator *iter = filp->private_data; int ret; while (trace_empty(iter)) { if ((filp->f_flags & O_NONBLOCK)) { return -EAGAIN; } /* * We block until we read something and tracing is disabled. * We still block if tracing is disabled, but we have never * read anything. This allows a user to cat this file, and * then enable tracing. But after we have read something, * we give an EOF when tracing is again disabled. * * iter->pos will be 0 if we haven't read anything. */ if (!tracer_tracing_is_on(iter->tr) && iter->pos) break; mutex_unlock(&iter->mutex); ret = wait_on_pipe(iter, 0); mutex_lock(&iter->mutex); if (ret) return ret; } return 1; } /* * Consumer reader. */ static ssize_t tracing_read_pipe(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_iterator *iter = filp->private_data; ssize_t sret; /* * Avoid more than one consumer on a single file descriptor * This is just a matter of traces coherency, the ring buffer itself * is protected. */ mutex_lock(&iter->mutex); /* return any leftover data */ sret = trace_seq_to_user(&iter->seq, ubuf, cnt); if (sret != -EBUSY) goto out; trace_seq_init(&iter->seq); if (iter->trace->read) { sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); if (sret) goto out; } waitagain: sret = tracing_wait_pipe(filp); if (sret <= 0) goto out; /* stop when tracing is finished */ if (trace_empty(iter)) { sret = 0; goto out; } if (cnt >= PAGE_SIZE) cnt = PAGE_SIZE - 1; /* reset all but tr, trace, and overruns */ memset(&iter->seq, 0, sizeof(struct trace_iterator) - offsetof(struct trace_iterator, seq)); cpumask_clear(iter->started); trace_seq_init(&iter->seq); iter->pos = -1; trace_event_read_lock(); trace_access_lock(iter->cpu_file); while (trace_find_next_entry_inc(iter) != NULL) { enum print_line_t ret; int save_len = iter->seq.seq.len; ret = print_trace_line(iter); if (ret == TRACE_TYPE_PARTIAL_LINE) { /* don't print partial lines */ iter->seq.seq.len = save_len; break; } if (ret != TRACE_TYPE_NO_CONSUME) trace_consume(iter); if (trace_seq_used(&iter->seq) >= cnt) break; /* * Setting the full flag means we reached the trace_seq buffer * size and we should leave by partial output condition above. * One of the trace_seq_* functions is not used properly. */ WARN_ONCE(iter->seq.full, "full flag set for trace type %d", iter->ent->type); } trace_access_unlock(iter->cpu_file); trace_event_read_unlock(); /* Now copy what we have to the user */ sret = trace_seq_to_user(&iter->seq, ubuf, cnt); if (iter->seq.seq.readpos >= trace_seq_used(&iter->seq)) trace_seq_init(&iter->seq); /* * If there was nothing to send to user, in spite of consuming trace * entries, go back to wait for more entries. */ if (sret == -EBUSY) goto waitagain; out: mutex_unlock(&iter->mutex); return sret; } static void tracing_spd_release_pipe(struct splice_pipe_desc *spd, unsigned int idx) { __free_page(spd->pages[idx]); } static size_t tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter) { size_t count; int save_len; int ret; /* Seq buffer is page-sized, exactly what we need. */ for (;;) { save_len = iter->seq.seq.len; ret = print_trace_line(iter); if (trace_seq_has_overflowed(&iter->seq)) { iter->seq.seq.len = save_len; break; } /* * This should not be hit, because it should only * be set if the iter->seq overflowed. But check it * anyway to be safe. */ if (ret == TRACE_TYPE_PARTIAL_LINE) { iter->seq.seq.len = save_len; break; } count = trace_seq_used(&iter->seq) - save_len; if (rem < count) { rem = 0; iter->seq.seq.len = save_len; break; } if (ret != TRACE_TYPE_NO_CONSUME) trace_consume(iter); rem -= count; if (!trace_find_next_entry_inc(iter)) { rem = 0; iter->ent = NULL; break; } } return rem; } static ssize_t tracing_splice_read_pipe(struct file *filp, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags) { struct page *pages_def[PIPE_DEF_BUFFERS]; struct partial_page partial_def[PIPE_DEF_BUFFERS]; struct trace_iterator *iter = filp->private_data; struct splice_pipe_desc spd = { .pages = pages_def, .partial = partial_def, .nr_pages = 0, /* This gets updated below. */ .nr_pages_max = PIPE_DEF_BUFFERS, .ops = &default_pipe_buf_ops, .spd_release = tracing_spd_release_pipe, }; ssize_t ret; size_t rem; unsigned int i; if (splice_grow_spd(pipe, &spd)) return -ENOMEM; mutex_lock(&iter->mutex); if (iter->trace->splice_read) { ret = iter->trace->splice_read(iter, filp, ppos, pipe, len, flags); if (ret) goto out_err; } ret = tracing_wait_pipe(filp); if (ret <= 0) goto out_err; if (!iter->ent && !trace_find_next_entry_inc(iter)) { ret = -EFAULT; goto out_err; } trace_event_read_lock(); trace_access_lock(iter->cpu_file); /* Fill as many pages as possible. */ for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) { spd.pages[i] = alloc_page(GFP_KERNEL); if (!spd.pages[i]) break; rem = tracing_fill_pipe_page(rem, iter); /* Copy the data into the page, so we can start over. */ ret = trace_seq_to_buffer(&iter->seq, page_address(spd.pages[i]), trace_seq_used(&iter->seq)); if (ret < 0) { __free_page(spd.pages[i]); break; } spd.partial[i].offset = 0; spd.partial[i].len = trace_seq_used(&iter->seq); trace_seq_init(&iter->seq); } trace_access_unlock(iter->cpu_file); trace_event_read_unlock(); mutex_unlock(&iter->mutex); spd.nr_pages = i; if (i) ret = splice_to_pipe(pipe, &spd); else ret = 0; out: splice_shrink_spd(&spd); return ret; out_err: mutex_unlock(&iter->mutex); goto out; } static ssize_t tracing_entries_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct inode *inode = file_inode(filp); struct trace_array *tr = inode->i_private; int cpu = tracing_get_cpu(inode); char buf[64]; int r = 0; ssize_t ret; mutex_lock(&trace_types_lock); if (cpu == RING_BUFFER_ALL_CPUS) { int cpu, buf_size_same; unsigned long size; size = 0; buf_size_same = 1; /* check if all cpu sizes are same */ for_each_tracing_cpu(cpu) { /* fill in the size from first enabled cpu */ if (size == 0) size = per_cpu_ptr(tr->array_buffer.data, cpu)->entries; if (size != per_cpu_ptr(tr->array_buffer.data, cpu)->entries) { buf_size_same = 0; break; } } if (buf_size_same) { if (!ring_buffer_expanded) r = sprintf(buf, "%lu (expanded: %lu)\n", size >> 10, trace_buf_size >> 10); else r = sprintf(buf, "%lu\n", size >> 10); } else r = sprintf(buf, "X\n"); } else r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->array_buffer.data, cpu)->entries >> 10); mutex_unlock(&trace_types_lock); ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); return ret; } static ssize_t tracing_entries_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct inode *inode = file_inode(filp); struct trace_array *tr = inode->i_private; unsigned long val; int ret; ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; /* must have at least 1 entry */ if (!val) return -EINVAL; /* value is in KB */ val <<= 10; ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode)); if (ret < 0) return ret; *ppos += cnt; return cnt; } static ssize_t tracing_total_entries_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; char buf[64]; int r, cpu; unsigned long size = 0, expanded_size = 0; mutex_lock(&trace_types_lock); for_each_tracing_cpu(cpu) { size += per_cpu_ptr(tr->array_buffer.data, cpu)->entries >> 10; if (!ring_buffer_expanded) expanded_size += trace_buf_size >> 10; } if (ring_buffer_expanded) r = sprintf(buf, "%lu\n", size); else r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size); mutex_unlock(&trace_types_lock); return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } static ssize_t tracing_free_buffer_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { /* * There is no need to read what the user has written, this function * is just to make sure that there is no error when "echo" is used */ *ppos += cnt; return cnt; } static int tracing_free_buffer_release(struct inode *inode, struct file *filp) { struct trace_array *tr = inode->i_private; /* disable tracing ? */ if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE) tracer_tracing_off(tr); /* resize the ring buffer to 0 */ tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS); trace_array_put(tr); return 0; } static ssize_t tracing_mark_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *fpos) { struct trace_array *tr = filp->private_data; struct ring_buffer_event *event; enum event_trigger_type tt = ETT_NONE; struct trace_buffer *buffer; struct print_entry *entry; unsigned long irq_flags; ssize_t written; int size; int len; /* Used in tracing_mark_raw_write() as well */ #define FAULTED_STR "<faulted>" #define FAULTED_SIZE (sizeof(FAULTED_STR) - 1) /* '\0' is already accounted for */ if (tracing_disabled) return -EINVAL; if (!(tr->trace_flags & TRACE_ITER_MARKERS)) return -EINVAL; if (cnt > TRACE_BUF_SIZE) cnt = TRACE_BUF_SIZE; BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); local_save_flags(irq_flags); size = sizeof(*entry) + cnt + 2; /* add '\0' and possible '\n' */ /* If less than "<faulted>", then make sure we can still add that */ if (cnt < FAULTED_SIZE) size += FAULTED_SIZE - cnt; buffer = tr->array_buffer.buffer; event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, irq_flags, preempt_count()); if (unlikely(!event)) /* Ring buffer disabled, return as if not open for write */ return -EBADF; entry = ring_buffer_event_data(event); entry->ip = _THIS_IP_; len = __copy_from_user_inatomic(&entry->buf, ubuf, cnt); if (len) { memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE); cnt = FAULTED_SIZE; written = -EFAULT; } else written = cnt; if (tr->trace_marker_file && !list_empty(&tr->trace_marker_file->triggers)) { /* do not add \n before testing triggers, but add \0 */ entry->buf[cnt] = '\0'; tt = event_triggers_call(tr->trace_marker_file, entry, event); } if (entry->buf[cnt - 1] != '\n') { entry->buf[cnt] = '\n'; entry->buf[cnt + 1] = '\0'; } else entry->buf[cnt] = '\0'; if (static_branch_unlikely(&trace_marker_exports_enabled)) ftrace_exports(event, TRACE_EXPORT_MARKER); __buffer_unlock_commit(buffer, event); if (tt) event_triggers_post_call(tr->trace_marker_file, tt); if (written > 0) *fpos += written; return written; } /* Limit it for now to 3K (including tag) */ #define RAW_DATA_MAX_SIZE (1024*3) static ssize_t tracing_mark_raw_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *fpos) { struct trace_array *tr = filp->private_data; struct ring_buffer_event *event; struct trace_buffer *buffer; struct raw_data_entry *entry; unsigned long irq_flags; ssize_t written; int size; int len; #define FAULT_SIZE_ID (FAULTED_SIZE + sizeof(int)) if (tracing_disabled) return -EINVAL; if (!(tr->trace_flags & TRACE_ITER_MARKERS)) return -EINVAL; /* The marker must at least have a tag id */ if (cnt < sizeof(unsigned int) || cnt > RAW_DATA_MAX_SIZE) return -EINVAL; if (cnt > TRACE_BUF_SIZE) cnt = TRACE_BUF_SIZE; BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); local_save_flags(irq_flags); size = sizeof(*entry) + cnt; if (cnt < FAULT_SIZE_ID) size += FAULT_SIZE_ID - cnt; buffer = tr->array_buffer.buffer; event = __trace_buffer_lock_reserve(buffer, TRACE_RAW_DATA, size, irq_flags, preempt_count()); if (!event) /* Ring buffer disabled, return as if not open for write */ return -EBADF; entry = ring_buffer_event_data(event); len = __copy_from_user_inatomic(&entry->id, ubuf, cnt); if (len) { entry->id = -1; memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE); written = -EFAULT; } else written = cnt; __buffer_unlock_commit(buffer, event); if (written > 0) *fpos += written; return written; } static int tracing_clock_show(struct seq_file *m, void *v) { struct trace_array *tr = m->private; int i; for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) seq_printf(m, "%s%s%s%s", i ? " " : "", i == tr->clock_id ? "[" : "", trace_clocks[i].name, i == tr->clock_id ? "]" : ""); seq_putc(m, '\n'); return 0; } int tracing_set_clock(struct trace_array *tr, const char *clockstr) { int i; for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) { if (strcmp(trace_clocks[i].name, clockstr) == 0) break; } if (i == ARRAY_SIZE(trace_clocks)) return -EINVAL; mutex_lock(&trace_types_lock); tr->clock_id = i; ring_buffer_set_clock(tr->array_buffer.buffer, trace_clocks[i].func); /* * New clock may not be consistent with the previous clock. * Reset the buffer so that it doesn't have incomparable timestamps. */ tracing_reset_online_cpus(&tr->array_buffer); #ifdef CONFIG_TRACER_MAX_TRACE if (tr->max_buffer.buffer) ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); tracing_reset_online_cpus(&tr->max_buffer); #endif mutex_unlock(&trace_types_lock); return 0; } static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *fpos) { struct seq_file *m = filp->private_data; struct trace_array *tr = m->private; char buf[64]; const char *clockstr; int ret; if (cnt >= sizeof(buf)) return -EINVAL; if (copy_from_user(buf, ubuf, cnt)) return -EFAULT; buf[cnt] = 0; clockstr = strstrip(buf); ret = tracing_set_clock(tr, clockstr); if (ret) return ret; *fpos += cnt; return cnt; } static int tracing_clock_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; ret = single_open(file, tracing_clock_show, inode->i_private); if (ret < 0) trace_array_put(tr); return ret; } static int tracing_time_stamp_mode_show(struct seq_file *m, void *v) { struct trace_array *tr = m->private; mutex_lock(&trace_types_lock); if (ring_buffer_time_stamp_abs(tr->array_buffer.buffer)) seq_puts(m, "delta [absolute]\n"); else seq_puts(m, "[delta] absolute\n"); mutex_unlock(&trace_types_lock); return 0; } static int tracing_time_stamp_mode_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; ret = single_open(file, tracing_time_stamp_mode_show, inode->i_private); if (ret < 0) trace_array_put(tr); return ret; } int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs) { int ret = 0; mutex_lock(&trace_types_lock); if (abs && tr->time_stamp_abs_ref++) goto out; if (!abs) { if (WARN_ON_ONCE(!tr->time_stamp_abs_ref)) { ret = -EINVAL; goto out; } if (--tr->time_stamp_abs_ref) goto out; } ring_buffer_set_time_stamp_abs(tr->array_buffer.buffer, abs); #ifdef CONFIG_TRACER_MAX_TRACE if (tr->max_buffer.buffer) ring_buffer_set_time_stamp_abs(tr->max_buffer.buffer, abs); #endif out: mutex_unlock(&trace_types_lock); return ret; } struct ftrace_buffer_info { struct trace_iterator iter; void *spare; unsigned int spare_cpu; unsigned int read; }; #ifdef CONFIG_TRACER_SNAPSHOT static int tracing_snapshot_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; struct trace_iterator *iter; struct seq_file *m; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; if (file->f_mode & FMODE_READ) { iter = __tracing_open(inode, file, true); if (IS_ERR(iter)) ret = PTR_ERR(iter); } else { /* Writes still need the seq_file to hold the private data */ ret = -ENOMEM; m = kzalloc(sizeof(*m), GFP_KERNEL); if (!m) goto out; iter = kzalloc(sizeof(*iter), GFP_KERNEL); if (!iter) { kfree(m); goto out; } ret = 0; iter->tr = tr; iter->array_buffer = &tr->max_buffer; iter->cpu_file = tracing_get_cpu(inode); m->private = iter; file->private_data = m; } out: if (ret < 0) trace_array_put(tr); return ret; } static ssize_t tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct seq_file *m = filp->private_data; struct trace_iterator *iter = m->private; struct trace_array *tr = iter->tr; unsigned long val; int ret; ret = tracing_update_buffers(); if (ret < 0) return ret; ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; mutex_lock(&trace_types_lock); if (tr->current_trace->use_max_tr) { ret = -EBUSY; goto out; } arch_spin_lock(&tr->max_lock); if (tr->cond_snapshot) ret = -EBUSY; arch_spin_unlock(&tr->max_lock); if (ret) goto out; switch (val) { case 0: if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { ret = -EINVAL; break; } if (tr->allocated_snapshot) free_snapshot(tr); break; case 1: /* Only allow per-cpu swap if the ring buffer supports it */ #ifndef CONFIG_RING_BUFFER_ALLOW_SWAP if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { ret = -EINVAL; break; } #endif if (tr->allocated_snapshot) ret = resize_buffer_duplicate_size(&tr->max_buffer, &tr->array_buffer, iter->cpu_file); else ret = tracing_alloc_snapshot_instance(tr); if (ret < 0) break; local_irq_disable(); /* Now, we're going to swap */ if (iter->cpu_file == RING_BUFFER_ALL_CPUS) update_max_tr(tr, current, smp_processor_id(), NULL); else update_max_tr_single(tr, current, iter->cpu_file); local_irq_enable(); break; default: if (tr->allocated_snapshot) { if (iter->cpu_file == RING_BUFFER_ALL_CPUS) tracing_reset_online_cpus(&tr->max_buffer); else tracing_reset_cpu(&tr->max_buffer, iter->cpu_file); } break; } if (ret >= 0) { *ppos += cnt; ret = cnt; } out: mutex_unlock(&trace_types_lock); return ret; } static int tracing_snapshot_release(struct inode *inode, struct file *file) { struct seq_file *m = file->private_data; int ret; ret = tracing_release(inode, file); if (file->f_mode & FMODE_READ) return ret; /* If write only, the seq_file is just a stub */ if (m) kfree(m->private); kfree(m); return 0; } static int tracing_buffers_open(struct inode *inode, struct file *filp); static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos); static int tracing_buffers_release(struct inode *inode, struct file *file); static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags); static int snapshot_raw_open(struct inode *inode, struct file *filp) { struct ftrace_buffer_info *info; int ret; /* The following checks for tracefs lockdown */ ret = tracing_buffers_open(inode, filp); if (ret < 0) return ret; info = filp->private_data; if (info->iter.trace->use_max_tr) { tracing_buffers_release(inode, filp); return -EBUSY; } info->iter.snapshot = true; info->iter.array_buffer = &info->iter.tr->max_buffer; return ret; } #endif /* CONFIG_TRACER_SNAPSHOT */ static const struct file_operations tracing_thresh_fops = { .open = tracing_open_generic, .read = tracing_thresh_read, .write = tracing_thresh_write, .llseek = generic_file_llseek, }; #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) static const struct file_operations tracing_max_lat_fops = { .open = tracing_open_generic, .read = tracing_max_lat_read, .write = tracing_max_lat_write, .llseek = generic_file_llseek, }; #endif static const struct file_operations set_tracer_fops = { .open = tracing_open_generic, .read = tracing_set_trace_read, .write = tracing_set_trace_write, .llseek = generic_file_llseek, }; static const struct file_operations tracing_pipe_fops = { .open = tracing_open_pipe, .poll = tracing_poll_pipe, .read = tracing_read_pipe, .splice_read = tracing_splice_read_pipe, .release = tracing_release_pipe, .llseek = no_llseek, }; static const struct file_operations tracing_entries_fops = { .open = tracing_open_generic_tr, .read = tracing_entries_read, .write = tracing_entries_write, .llseek = generic_file_llseek, .release = tracing_release_generic_tr, }; static const struct file_operations tracing_total_entries_fops = { .open = tracing_open_generic_tr, .read = tracing_total_entries_read, .llseek = generic_file_llseek, .release = tracing_release_generic_tr, }; static const struct file_operations tracing_free_buffer_fops = { .open = tracing_open_generic_tr, .write = tracing_free_buffer_write, .release = tracing_free_buffer_release, }; static const struct file_operations tracing_mark_fops = { .open = tracing_open_generic_tr, .write = tracing_mark_write, .llseek = generic_file_llseek, .release = tracing_release_generic_tr, }; static const struct file_operations tracing_mark_raw_fops = { .open = tracing_open_generic_tr, .write = tracing_mark_raw_write, .llseek = generic_file_llseek, .release = tracing_release_generic_tr, }; static const struct file_operations trace_clock_fops = { .open = tracing_clock_open, .read = seq_read, .llseek = seq_lseek, .release = tracing_single_release_tr, .write = tracing_clock_write, }; static const struct file_operations trace_time_stamp_mode_fops = { .open = tracing_time_stamp_mode_open, .read = seq_read, .llseek = seq_lseek, .release = tracing_single_release_tr, }; #ifdef CONFIG_TRACER_SNAPSHOT static const struct file_operations snapshot_fops = { .open = tracing_snapshot_open, .read = seq_read, .write = tracing_snapshot_write, .llseek = tracing_lseek, .release = tracing_snapshot_release, }; static const struct file_operations snapshot_raw_fops = { .open = snapshot_raw_open, .read = tracing_buffers_read, .release = tracing_buffers_release, .splice_read = tracing_buffers_splice_read, .llseek = no_llseek, }; #endif /* CONFIG_TRACER_SNAPSHOT */ #define TRACING_LOG_ERRS_MAX 8 #define TRACING_LOG_LOC_MAX 128 #define CMD_PREFIX " Command: " struct err_info { const char **errs; /* ptr to loc-specific array of err strings */ u8 type; /* index into errs -> specific err string */ u8 pos; /* MAX_FILTER_STR_VAL = 256 */ u64 ts; }; struct tracing_log_err { struct list_head list; struct err_info info; char loc[TRACING_LOG_LOC_MAX]; /* err location */ char cmd[MAX_FILTER_STR_VAL]; /* what caused err */ }; static DEFINE_MUTEX(tracing_err_log_lock); static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr) { struct tracing_log_err *err; if (tr->n_err_log_entries < TRACING_LOG_ERRS_MAX) { err = kzalloc(sizeof(*err), GFP_KERNEL); if (!err) err = ERR_PTR(-ENOMEM); tr->n_err_log_entries++; return err; } err = list_first_entry(&tr->err_log, struct tracing_log_err, list); list_del(&err->list); return err; } /** * err_pos - find the position of a string within a command for error careting * @cmd: The tracing command that caused the error * @str: The string to position the caret at within @cmd * * Finds the position of the first occurence of @str within @cmd. The * return value can be passed to tracing_log_err() for caret placement * within @cmd. * * Returns the index within @cmd of the first occurence of @str or 0 * if @str was not found. */ unsigned int err_pos(char *cmd, const char *str) { char *found; if (WARN_ON(!strlen(cmd))) return 0; found = strstr(cmd, str); if (found) return found - cmd; return 0; } /** * tracing_log_err - write an error to the tracing error log * @tr: The associated trace array for the error (NULL for top level array) * @loc: A string describing where the error occurred * @cmd: The tracing command that caused the error * @errs: The array of loc-specific static error strings * @type: The index into errs[], which produces the specific static err string * @pos: The position the caret should be placed in the cmd * * Writes an error into tracing/error_log of the form: * * <loc>: error: <text> * Command: <cmd> * ^ * * tracing/error_log is a small log file containing the last * TRACING_LOG_ERRS_MAX errors (8). Memory for errors isn't allocated * unless there has been a tracing error, and the error log can be * cleared and have its memory freed by writing the empty string in * truncation mode to it i.e. echo > tracing/error_log. * * NOTE: the @errs array along with the @type param are used to * produce a static error string - this string is not copied and saved * when the error is logged - only a pointer to it is saved. See * existing callers for examples of how static strings are typically * defined for use with tracing_log_err(). */ void tracing_log_err(struct trace_array *tr, const char *loc, const char *cmd, const char **errs, u8 type, u8 pos) { struct tracing_log_err *err; if (!tr) tr = &global_trace; mutex_lock(&tracing_err_log_lock); err = get_tracing_log_err(tr); if (PTR_ERR(err) == -ENOMEM) { mutex_unlock(&tracing_err_log_lock); return; } snprintf(err->loc, TRACING_LOG_LOC_MAX, "%s: error: ", loc); snprintf(err->cmd, MAX_FILTER_STR_VAL,"\n" CMD_PREFIX "%s\n", cmd); err->info.errs = errs; err->info.type = type; err->info.pos = pos; err->info.ts = local_clock(); list_add_tail(&err->list, &tr->err_log); mutex_unlock(&tracing_err_log_lock); } static void clear_tracing_err_log(struct trace_array *tr) { struct tracing_log_err *err, *next; mutex_lock(&tracing_err_log_lock); list_for_each_entry_safe(err, next, &tr->err_log, list) { list_del(&err->list); kfree(err); } tr->n_err_log_entries = 0; mutex_unlock(&tracing_err_log_lock); } static void *tracing_err_log_seq_start(struct seq_file *m, loff_t *pos) { struct trace_array *tr = m->private; mutex_lock(&tracing_err_log_lock); return seq_list_start(&tr->err_log, *pos); } static void *tracing_err_log_seq_next(struct seq_file *m, void *v, loff_t *pos) { struct trace_array *tr = m->private; return seq_list_next(v, &tr->err_log, pos); } static void tracing_err_log_seq_stop(struct seq_file *m, void *v) { mutex_unlock(&tracing_err_log_lock); } static void tracing_err_log_show_pos(struct seq_file *m, u8 pos) { u8 i; for (i = 0; i < sizeof(CMD_PREFIX) - 1; i++) seq_putc(m, ' '); for (i = 0; i < pos; i++) seq_putc(m, ' '); seq_puts(m, "^\n"); } static int tracing_err_log_seq_show(struct seq_file *m, void *v) { struct tracing_log_err *err = v; if (err) { const char *err_text = err->info.errs[err->info.type]; u64 sec = err->info.ts; u32 nsec; nsec = do_div(sec, NSEC_PER_SEC); seq_printf(m, "[%5llu.%06u] %s%s", sec, nsec / 1000, err->loc, err_text); seq_printf(m, "%s", err->cmd); tracing_err_log_show_pos(m, err->info.pos); } return 0; } static const struct seq_operations tracing_err_log_seq_ops = { .start = tracing_err_log_seq_start, .next = tracing_err_log_seq_next, .stop = tracing_err_log_seq_stop, .show = tracing_err_log_seq_show }; static int tracing_err_log_open(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; int ret = 0; ret = tracing_check_open_get_tr(tr); if (ret) return ret; /* If this file was opened for write, then erase contents */ if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) clear_tracing_err_log(tr); if (file->f_mode & FMODE_READ) { ret = seq_open(file, &tracing_err_log_seq_ops); if (!ret) { struct seq_file *m = file->private_data; m->private = tr; } else { trace_array_put(tr); } } return ret; } static ssize_t tracing_err_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { return count; } static int tracing_err_log_release(struct inode *inode, struct file *file) { struct trace_array *tr = inode->i_private; trace_array_put(tr); if (file->f_mode & FMODE_READ) seq_release(inode, file); return 0; } static const struct file_operations tracing_err_log_fops = { .open = tracing_err_log_open, .write = tracing_err_log_write, .read = seq_read, .llseek = seq_lseek, .release = tracing_err_log_release, }; static int tracing_buffers_open(struct inode *inode, struct file *filp) { struct trace_array *tr = inode->i_private; struct ftrace_buffer_info *info; int ret; ret = tracing_check_open_get_tr(tr); if (ret) return ret; info = kvzalloc(sizeof(*info), GFP_KERNEL); if (!info) { trace_array_put(tr); return -ENOMEM; } mutex_lock(&trace_types_lock); info->iter.tr = tr; info->iter.cpu_file = tracing_get_cpu(inode); info->iter.trace = tr->current_trace; info->iter.array_buffer = &tr->array_buffer; info->spare = NULL; /* Force reading ring buffer for first read */ info->read = (unsigned int)-1; filp->private_data = info; tr->trace_ref++; mutex_unlock(&trace_types_lock); ret = nonseekable_open(inode, filp); if (ret < 0) trace_array_put(tr); return ret; } static __poll_t tracing_buffers_poll(struct file *filp, poll_table *poll_table) { struct ftrace_buffer_info *info = filp->private_data; struct trace_iterator *iter = &info->iter; return trace_poll(iter, filp, poll_table); } static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos) { struct ftrace_buffer_info *info = filp->private_data; struct trace_iterator *iter = &info->iter; ssize_t ret = 0; ssize_t size; if (!count) return 0; #ifdef CONFIG_TRACER_MAX_TRACE if (iter->snapshot && iter->tr->current_trace->use_max_tr) return -EBUSY; #endif if (!info->spare) { info->spare = ring_buffer_alloc_read_page(iter->array_buffer->buffer, iter->cpu_file); if (IS_ERR(info->spare)) { ret = PTR_ERR(info->spare); info->spare = NULL; } else { info->spare_cpu = iter->cpu_file; } } if (!info->spare) return ret; /* Do we have previous read data to read? */ if (info->read < PAGE_SIZE) goto read; again: trace_access_lock(iter->cpu_file); ret = ring_buffer_read_page(iter->array_buffer->buffer, &info->spare, count, iter->cpu_file, 0); trace_access_unlock(iter->cpu_file); if (ret < 0) { if (trace_empty(iter)) { if ((filp->f_flags & O_NONBLOCK)) return -EAGAIN; ret = wait_on_pipe(iter, 0); if (ret) return ret; goto again; } return 0; } info->read = 0; read: size = PAGE_SIZE - info->read; if (size > count) size = count; ret = copy_to_user(ubuf, info->spare + info->read, size); if (ret == size) return -EFAULT; size -= ret; *ppos += size; info->read += size; return size; } static int tracing_buffers_release(struct inode *inode, struct file *file) { struct ftrace_buffer_info *info = file->private_data; struct trace_iterator *iter = &info->iter; mutex_lock(&trace_types_lock); iter->tr->trace_ref--; __trace_array_put(iter->tr); if (info->spare) ring_buffer_free_read_page(iter->array_buffer->buffer, info->spare_cpu, info->spare); kvfree(info); mutex_unlock(&trace_types_lock); return 0; } struct buffer_ref { struct trace_buffer *buffer; void *page; int cpu; refcount_t refcount; }; static void buffer_ref_release(struct buffer_ref *ref) { if (!refcount_dec_and_test(&ref->refcount)) return; ring_buffer_free_read_page(ref->buffer, ref->cpu, ref->page); kfree(ref); } static void buffer_pipe_buf_release(struct pipe_inode_info *pipe, struct pipe_buffer *buf) { struct buffer_ref *ref = (struct buffer_ref *)buf->private; buffer_ref_release(ref); buf->private = 0; } static bool buffer_pipe_buf_get(struct pipe_inode_info *pipe, struct pipe_buffer *buf) { struct buffer_ref *ref = (struct buffer_ref *)buf->private; if (refcount_read(&ref->refcount) > INT_MAX/2) return false; refcount_inc(&ref->refcount); return true; } /* Pipe buffer operations for a buffer. */ static const struct pipe_buf_operations buffer_pipe_buf_ops = { .release = buffer_pipe_buf_release, .get = buffer_pipe_buf_get, }; /* * Callback from splice_to_pipe(), if we need to release some pages * at the end of the spd in case we error'ed out in filling the pipe. */ static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i) { struct buffer_ref *ref = (struct buffer_ref *)spd->partial[i].private; buffer_ref_release(ref); spd->partial[i].private = 0; } static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags) { struct ftrace_buffer_info *info = file->private_data; struct trace_iterator *iter = &info->iter; struct partial_page partial_def[PIPE_DEF_BUFFERS]; struct page *pages_def[PIPE_DEF_BUFFERS]; struct splice_pipe_desc spd = { .pages = pages_def, .partial = partial_def, .nr_pages_max = PIPE_DEF_BUFFERS, .ops = &buffer_pipe_buf_ops, .spd_release = buffer_spd_release, }; struct buffer_ref *ref; int entries, i; ssize_t ret = 0; #ifdef CONFIG_TRACER_MAX_TRACE if (iter->snapshot && iter->tr->current_trace->use_max_tr) return -EBUSY; #endif if (*ppos & (PAGE_SIZE - 1)) return -EINVAL; if (len & (PAGE_SIZE - 1)) { if (len < PAGE_SIZE) return -EINVAL; len &= PAGE_MASK; } if (splice_grow_spd(pipe, &spd)) return -ENOMEM; again: trace_access_lock(iter->cpu_file); entries = ring_buffer_entries_cpu(iter->array_buffer->buffer, iter->cpu_file); for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) { struct page *page; int r; ref = kzalloc(sizeof(*ref), GFP_KERNEL); if (!ref) { ret = -ENOMEM; break; } refcount_set(&ref->refcount, 1); ref->buffer = iter->array_buffer->buffer; ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file); if (IS_ERR(ref->page)) { ret = PTR_ERR(ref->page); ref->page = NULL; kfree(ref); break; } ref->cpu = iter->cpu_file; r = ring_buffer_read_page(ref->buffer, &ref->page, len, iter->cpu_file, 1); if (r < 0) { ring_buffer_free_read_page(ref->buffer, ref->cpu, ref->page); kfree(ref); break; } page = virt_to_page(ref->page); spd.pages[i] = page; spd.partial[i].len = PAGE_SIZE; spd.partial[i].offset = 0; spd.partial[i].private = (unsigned long)ref; spd.nr_pages++; *ppos += PAGE_SIZE; entries = ring_buffer_entries_cpu(iter->array_buffer->buffer, iter->cpu_file); } trace_access_unlock(iter->cpu_file); spd.nr_pages = i; /* did we read anything? */ if (!spd.nr_pages) { if (ret) goto out; ret = -EAGAIN; if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) goto out; ret = wait_on_pipe(iter, iter->tr->buffer_percent); if (ret) goto out; goto again; } ret = splice_to_pipe(pipe, &spd); out: splice_shrink_spd(&spd); return ret; } static const struct file_operations tracing_buffers_fops = { .open = tracing_buffers_open, .read = tracing_buffers_read, .poll = tracing_buffers_poll, .release = tracing_buffers_release, .splice_read = tracing_buffers_splice_read, .llseek = no_llseek, }; static ssize_t tracing_stats_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos) { struct inode *inode = file_inode(filp); struct trace_array *tr = inode->i_private; struct array_buffer *trace_buf = &tr->array_buffer; int cpu = tracing_get_cpu(inode); struct trace_seq *s; unsigned long cnt; unsigned long long t; unsigned long usec_rem; s = kmalloc(sizeof(*s), GFP_KERNEL); if (!s) return -ENOMEM; trace_seq_init(s); cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "entries: %ld\n", cnt); cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "overrun: %ld\n", cnt); cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "commit overrun: %ld\n", cnt); cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "bytes: %ld\n", cnt); if (trace_clocks[tr->clock_id].in_ns) { /* local or global for trace_clock */ t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); usec_rem = do_div(t, USEC_PER_SEC); trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", t, usec_rem); t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu)); usec_rem = do_div(t, USEC_PER_SEC); trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem); } else { /* counter or tsc mode for trace_clock */ trace_seq_printf(s, "oldest event ts: %llu\n", ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); trace_seq_printf(s, "now ts: %llu\n", ring_buffer_time_stamp(trace_buf->buffer, cpu)); } cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "dropped events: %ld\n", cnt); cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "read events: %ld\n", cnt); count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, trace_seq_used(s)); kfree(s); return count; } static const struct file_operations tracing_stats_fops = { .open = tracing_open_generic_tr, .read = tracing_stats_read, .llseek = generic_file_llseek, .release = tracing_release_generic_tr, }; #ifdef CONFIG_DYNAMIC_FTRACE static ssize_t tracing_read_dyn_info(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { ssize_t ret; char *buf; int r; /* 256 should be plenty to hold the amount needed */ buf = kmalloc(256, GFP_KERNEL); if (!buf) return -ENOMEM; r = scnprintf(buf, 256, "%ld pages:%ld groups: %ld\n", ftrace_update_tot_cnt, ftrace_number_of_pages, ftrace_number_of_groups); ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); kfree(buf); return ret; } static const struct file_operations tracing_dyn_info_fops = { .open = tracing_open_generic, .read = tracing_read_dyn_info, .llseek = generic_file_llseek, }; #endif /* CONFIG_DYNAMIC_FTRACE */ #if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) static void ftrace_snapshot(unsigned long ip, unsigned long parent_ip, struct trace_array *tr, struct ftrace_probe_ops *ops, void *data) { tracing_snapshot_instance(tr); } static void ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, struct trace_array *tr, struct ftrace_probe_ops *ops, void *data) { struct ftrace_func_mapper *mapper = data; long *count = NULL; if (mapper) count = (long *)ftrace_func_mapper_find_ip(mapper, ip); if (count) { if (*count <= 0) return; (*count)--; } tracing_snapshot_instance(tr); } static int ftrace_snapshot_print(struct seq_file *m, unsigned long ip, struct ftrace_probe_ops *ops, void *data) { struct ftrace_func_mapper *mapper = data; long *count = NULL; seq_printf(m, "%ps:", (void *)ip); seq_puts(m, "snapshot"); if (mapper) count = (long *)ftrace_func_mapper_find_ip(mapper, ip); if (count) seq_printf(m, ":count=%ld\n", *count); else seq_puts(m, ":unlimited\n"); return 0; } static int ftrace_snapshot_init(struct ftrace_probe_ops *ops, struct trace_array *tr, unsigned long ip, void *init_data, void **data) { struct ftrace_func_mapper *mapper = *data; if (!mapper) { mapper = allocate_ftrace_func_mapper(); if (!mapper) return -ENOMEM; *data = mapper; } return ftrace_func_mapper_add_ip(mapper, ip, init_data); } static void ftrace_snapshot_free(struct ftrace_probe_ops *ops, struct trace_array *tr, unsigned long ip, void *data) { struct ftrace_func_mapper *mapper = data; if (!ip) { if (!mapper) return; free_ftrace_func_mapper(mapper, NULL); return; } ftrace_func_mapper_remove_ip(mapper, ip); } static struct ftrace_probe_ops snapshot_probe_ops = { .func = ftrace_snapshot, .print = ftrace_snapshot_print, }; static struct ftrace_probe_ops snapshot_count_probe_ops = { .func = ftrace_count_snapshot, .print = ftrace_snapshot_print, .init = ftrace_snapshot_init, .free = ftrace_snapshot_free, }; static int ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash, char *glob, char *cmd, char *param, int enable) { struct ftrace_probe_ops *ops; void *count = (void *)-1; char *number; int ret; if (!tr) return -ENODEV; /* hash funcs only work with set_ftrace_filter */ if (!enable) return -EINVAL; ops = param ? &snapshot_count_probe_ops : &snapshot_probe_ops; if (glob[0] == '!') return unregister_ftrace_function_probe_func(glob+1, tr, ops); if (!param) goto out_reg; number = strsep(&param, ":"); if (!strlen(number)) goto out_reg; /* * We use the callback data field (which is a pointer) * as our counter. */ ret = kstrtoul(number, 0, (unsigned long *)&count); if (ret) return ret; out_reg: ret = tracing_alloc_snapshot_instance(tr); if (ret < 0) goto out; ret = register_ftrace_function_probe(glob, tr, ops, count); out: return ret < 0 ? ret : 0; } static struct ftrace_func_command ftrace_snapshot_cmd = { .name = "snapshot", .func = ftrace_trace_snapshot_callback, }; static __init int register_snapshot_cmd(void) { return register_ftrace_command(&ftrace_snapshot_cmd); } #else static inline __init int register_snapshot_cmd(void) { return 0; } #endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */ static struct dentry *tracing_get_dentry(struct trace_array *tr) { if (WARN_ON(!tr->dir)) return ERR_PTR(-ENODEV); /* Top directory uses NULL as the parent */ if (tr->flags & TRACE_ARRAY_FL_GLOBAL) return NULL; /* All sub buffers have a descriptor */ return tr->dir; } static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu) { struct dentry *d_tracer; if (tr->percpu_dir) return tr->percpu_dir; d_tracer = tracing_get_dentry(tr); if (IS_ERR(d_tracer)) return NULL; tr->percpu_dir = tracefs_create_dir("per_cpu", d_tracer); MEM_FAIL(!tr->percpu_dir, "Could not create tracefs directory 'per_cpu/%d'\n", cpu); return tr->percpu_dir; } static struct dentry * trace_create_cpu_file(const char *name, umode_t mode, struct dentry *parent, void *data, long cpu, const struct file_operations *fops) { struct dentry *ret = trace_create_file(name, mode, parent, data, fops); if (ret) /* See tracing_get_cpu() */ d_inode(ret)->i_cdev = (void *)(cpu + 1); return ret; } static void tracing_init_tracefs_percpu(struct trace_array *tr, long cpu) { struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); struct dentry *d_cpu; char cpu_dir[30]; /* 30 characters should be more than enough */ if (!d_percpu) return; snprintf(cpu_dir, 30, "cpu%ld", cpu); d_cpu = tracefs_create_dir(cpu_dir, d_percpu); if (!d_cpu) { pr_warn("Could not create tracefs '%s' entry\n", cpu_dir); return; } /* per cpu trace_pipe */ trace_create_cpu_file("trace_pipe", 0444, d_cpu, tr, cpu, &tracing_pipe_fops); /* per cpu trace */ trace_create_cpu_file("trace", 0644, d_cpu, tr, cpu, &tracing_fops); trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu, tr, cpu, &tracing_buffers_fops); trace_create_cpu_file("stats", 0444, d_cpu, tr, cpu, &tracing_stats_fops); trace_create_cpu_file("buffer_size_kb", 0444, d_cpu, tr, cpu, &tracing_entries_fops); #ifdef CONFIG_TRACER_SNAPSHOT trace_create_cpu_file("snapshot", 0644, d_cpu, tr, cpu, &snapshot_fops); trace_create_cpu_file("snapshot_raw", 0444, d_cpu, tr, cpu, &snapshot_raw_fops); #endif } #ifdef CONFIG_FTRACE_SELFTEST /* Let selftest have access to static functions in this file */ #include "trace_selftest.c" #endif static ssize_t trace_options_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_option_dentry *topt = filp->private_data; char *buf; if (topt->flags->val & topt->opt->bit) buf = "1\n"; else buf = "0\n"; return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); } static ssize_t trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_option_dentry *topt = filp->private_data; unsigned long val; int ret; ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; if (val != 0 && val != 1) return -EINVAL; if (!!(topt->flags->val & topt->opt->bit) != val) { mutex_lock(&trace_types_lock); ret = __set_tracer_option(topt->tr, topt->flags, topt->opt, !val); mutex_unlock(&trace_types_lock); if (ret) return ret; } *ppos += cnt; return cnt; } static const struct file_operations trace_options_fops = { .open = tracing_open_generic, .read = trace_options_read, .write = trace_options_write, .llseek = generic_file_llseek, }; /* * In order to pass in both the trace_array descriptor as well as the index * to the flag that the trace option file represents, the trace_array * has a character array of trace_flags_index[], which holds the index * of the bit for the flag it represents. index[0] == 0, index[1] == 1, etc. * The address of this character array is passed to the flag option file * read/write callbacks. * * In order to extract both the index and the trace_array descriptor, * get_tr_index() uses the following algorithm. * * idx = *ptr; * * As the pointer itself contains the address of the index (remember * index[1] == 1). * * Then to get the trace_array descriptor, by subtracting that index * from the ptr, we get to the start of the index itself. * * ptr - idx == &index[0] * * Then a simple container_of() from that pointer gets us to the * trace_array descriptor. */ static void get_tr_index(void *data, struct trace_array **ptr, unsigned int *pindex) { *pindex = *(unsigned char *)data; *ptr = container_of(data - *pindex, struct trace_array, trace_flags_index); } static ssize_t trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { void *tr_index = filp->private_data; struct trace_array *tr; unsigned int index; char *buf; get_tr_index(tr_index, &tr, &index); if (tr->trace_flags & (1 << index)) buf = "1\n"; else buf = "0\n"; return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); } static ssize_t trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { void *tr_index = filp->private_data; struct trace_array *tr; unsigned int index; unsigned long val; int ret; get_tr_index(tr_index, &tr, &index); ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; if (val != 0 && val != 1) return -EINVAL; mutex_lock(&event_mutex); mutex_lock(&trace_types_lock); ret = set_tracer_flag(tr, 1 << index, val); mutex_unlock(&trace_types_lock); mutex_unlock(&event_mutex); if (ret < 0) return ret; *ppos += cnt; return cnt; } static const struct file_operations trace_options_core_fops = { .open = tracing_open_generic, .read = trace_options_core_read, .write = trace_options_core_write, .llseek = generic_file_llseek, }; struct dentry *trace_create_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *fops) { struct dentry *ret; ret = tracefs_create_file(name, mode, parent, data, fops); if (!ret) pr_warn("Could not create tracefs '%s' entry\n", name); return ret; } static struct dentry *trace_options_init_dentry(struct trace_array *tr) { struct dentry *d_tracer; if (tr->options) return tr->options; d_tracer = tracing_get_dentry(tr); if (IS_ERR(d_tracer)) return NULL; tr->options = tracefs_create_dir("options", d_tracer); if (!tr->options) { pr_warn("Could not create tracefs directory 'options'\n"); return NULL; } return tr->options; } static void create_trace_option_file(struct trace_array *tr, struct trace_option_dentry *topt, struct tracer_flags *flags, struct tracer_opt *opt) { struct dentry *t_options; t_options = trace_options_init_dentry(tr); if (!t_options) return; topt->flags = flags; topt->opt = opt; topt->tr = tr; topt->entry = trace_create_file(opt->name, 0644, t_options, topt, &trace_options_fops); } static void create_trace_option_files(struct trace_array *tr, struct tracer *tracer) { struct trace_option_dentry *topts; struct trace_options *tr_topts; struct tracer_flags *flags; struct tracer_opt *opts; int cnt; int i; if (!tracer) return; flags = tracer->flags; if (!flags || !flags->opts) return; /* * If this is an instance, only create flags for tracers * the instance may have. */ if (!trace_ok_for_array(tracer, tr)) return; for (i = 0; i < tr->nr_topts; i++) { /* Make sure there's no duplicate flags. */ if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags)) return; } opts = flags->opts; for (cnt = 0; opts[cnt].name; cnt++) ; topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL); if (!topts) return; tr_topts = krealloc(tr->topts, sizeof(*tr->topts) * (tr->nr_topts + 1), GFP_KERNEL); if (!tr_topts) { kfree(topts); return; } tr->topts = tr_topts; tr->topts[tr->nr_topts].tracer = tracer; tr->topts[tr->nr_topts].topts = topts; tr->nr_topts++; for (cnt = 0; opts[cnt].name; cnt++) { create_trace_option_file(tr, &topts[cnt], flags, &opts[cnt]); MEM_FAIL(topts[cnt].entry == NULL, "Failed to create trace option: %s", opts[cnt].name); } } static struct dentry * create_trace_option_core_file(struct trace_array *tr, const char *option, long index) { struct dentry *t_options; t_options = trace_options_init_dentry(tr); if (!t_options) return NULL; return trace_create_file(option, 0644, t_options, (void *)&tr->trace_flags_index[index], &trace_options_core_fops); } static void create_trace_options_dir(struct trace_array *tr) { struct dentry *t_options; bool top_level = tr == &global_trace; int i; t_options = trace_options_init_dentry(tr); if (!t_options) return; for (i = 0; trace_options[i]; i++) { if (top_level || !((1 << i) & TOP_LEVEL_TRACE_FLAGS)) create_trace_option_core_file(tr, trace_options[i], i); } } static ssize_t rb_simple_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; char buf[64]; int r; r = tracer_tracing_is_on(tr); r = sprintf(buf, "%d\n", r); return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } static ssize_t rb_simple_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; struct trace_buffer *buffer = tr->array_buffer.buffer; unsigned long val; int ret; ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; if (buffer) { mutex_lock(&trace_types_lock); if (!!val == tracer_tracing_is_on(tr)) { val = 0; /* do nothing */ } else if (val) { tracer_tracing_on(tr); if (tr->current_trace->start) tr->current_trace->start(tr); } else { tracer_tracing_off(tr); if (tr->current_trace->stop) tr->current_trace->stop(tr); } mutex_unlock(&trace_types_lock); } (*ppos)++; return cnt; } static const struct file_operations rb_simple_fops = { .open = tracing_open_generic_tr, .read = rb_simple_read, .write = rb_simple_write, .release = tracing_release_generic_tr, .llseek = default_llseek, }; static ssize_t buffer_percent_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; char buf[64]; int r; r = tr->buffer_percent; r = sprintf(buf, "%d\n", r); return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } static ssize_t buffer_percent_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; unsigned long val; int ret; ret = kstrtoul_from_user(ubuf, cnt, 10, &val); if (ret) return ret; if (val > 100) return -EINVAL; if (!val) val = 1; tr->buffer_percent = val; (*ppos)++; return cnt; } static const struct file_operations buffer_percent_fops = { .open = tracing_open_generic_tr, .read = buffer_percent_read, .write = buffer_percent_write, .release = tracing_release_generic_tr, .llseek = default_llseek, }; static struct dentry *trace_instance_dir; static void init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer); static int allocate_trace_buffer(struct trace_array *tr, struct array_buffer *buf, int size) { enum ring_buffer_flags rb_flags; rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0; buf->tr = tr; buf->buffer = ring_buffer_alloc(size, rb_flags); if (!buf->buffer) return -ENOMEM; buf->data = alloc_percpu(struct trace_array_cpu); if (!buf->data) { ring_buffer_free(buf->buffer); buf->buffer = NULL; return -ENOMEM; } /* Allocate the first page for all buffers */ set_buffer_entries(&tr->array_buffer, ring_buffer_size(tr->array_buffer.buffer, 0)); return 0; } static int allocate_trace_buffers(struct trace_array *tr, int size) { int ret; ret = allocate_trace_buffer(tr, &tr->array_buffer, size); if (ret) return ret; #ifdef CONFIG_TRACER_MAX_TRACE ret = allocate_trace_buffer(tr, &tr->max_buffer, allocate_snapshot ? size : 1); if (MEM_FAIL(ret, "Failed to allocate trace buffer\n")) { ring_buffer_free(tr->array_buffer.buffer); tr->array_buffer.buffer = NULL; free_percpu(tr->array_buffer.data); tr->array_buffer.data = NULL; return -ENOMEM; } tr->allocated_snapshot = allocate_snapshot; /* * Only the top level trace array gets its snapshot allocated * from the kernel command line. */ allocate_snapshot = false; #end