1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) 2017 Facebook 4 */ 5 6#include <linux/kernel.h> 7#include <linux/blkdev.h> 8#include <linux/debugfs.h> 9 10#include "blk.h" 11#include "blk-mq.h" 12#include "blk-mq-debugfs.h" 13#include "blk-mq-sched.h" 14#include "blk-rq-qos.h" 15 16static int queue_poll_stat_show(void *data, struct seq_file *m) 17{ 18 return 0; 19} 20 21static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) 22 __acquires(&q->requeue_lock) 23{ 24 struct request_queue *q = m->private; 25 26 spin_lock_irq(&q->requeue_lock); 27 return seq_list_start(&q->requeue_list, *pos); 28} 29 30static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) 31{ 32 struct request_queue *q = m->private; 33 34 return seq_list_next(v, &q->requeue_list, pos); 35} 36 37static void queue_requeue_list_stop(struct seq_file *m, void *v) 38 __releases(&q->requeue_lock) 39{ 40 struct request_queue *q = m->private; 41 42 spin_unlock_irq(&q->requeue_lock); 43} 44 45static const struct seq_operations queue_requeue_list_seq_ops = { 46 .start = queue_requeue_list_start, 47 .next = queue_requeue_list_next, 48 .stop = queue_requeue_list_stop, 49 .show = blk_mq_debugfs_rq_show, 50}; 51 52static int blk_flags_show(struct seq_file *m, const unsigned long flags, 53 const char *const *flag_name, int flag_name_count) 54{ 55 bool sep = false; 56 int i; 57 58 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { 59 if (!(flags & BIT(i))) 60 continue; 61 if (sep) 62 seq_puts(m, "|"); 63 sep = true; 64 if (i < flag_name_count && flag_name[i]) 65 seq_puts(m, flag_name[i]); 66 else 67 seq_printf(m, "%d", i); 68 } 69 return 0; 70} 71 72static int queue_pm_only_show(void *data, struct seq_file *m) 73{ 74 struct request_queue *q = data; 75 76 seq_printf(m, "%d\n", atomic_read(&q->pm_only)); 77 return 0; 78} 79 80#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name 81static const char *const blk_queue_flag_name[] = { 82 QUEUE_FLAG_NAME(STOPPED), 83 QUEUE_FLAG_NAME(DYING), 84 QUEUE_FLAG_NAME(NOMERGES), 85 QUEUE_FLAG_NAME(SAME_COMP), 86 QUEUE_FLAG_NAME(FAIL_IO), 87 QUEUE_FLAG_NAME(NONROT), 88 QUEUE_FLAG_NAME(IO_STAT), 89 QUEUE_FLAG_NAME(NOXMERGES), 90 QUEUE_FLAG_NAME(ADD_RANDOM), 91 QUEUE_FLAG_NAME(SYNCHRONOUS), 92 QUEUE_FLAG_NAME(SAME_FORCE), 93 QUEUE_FLAG_NAME(INIT_DONE), 94 QUEUE_FLAG_NAME(STABLE_WRITES), 95 QUEUE_FLAG_NAME(POLL), 96 QUEUE_FLAG_NAME(WC), 97 QUEUE_FLAG_NAME(FUA), 98 QUEUE_FLAG_NAME(DAX), 99 QUEUE_FLAG_NAME(STATS), 100 QUEUE_FLAG_NAME(REGISTERED), 101 QUEUE_FLAG_NAME(QUIESCED), 102 QUEUE_FLAG_NAME(PCI_P2PDMA), 103 QUEUE_FLAG_NAME(ZONE_RESETALL), 104 QUEUE_FLAG_NAME(RQ_ALLOC_TIME), 105 QUEUE_FLAG_NAME(HCTX_ACTIVE), 106 QUEUE_FLAG_NAME(NOWAIT), 107 QUEUE_FLAG_NAME(SQ_SCHED), 108 QUEUE_FLAG_NAME(SKIP_TAGSET_QUIESCE), 109}; 110#undef QUEUE_FLAG_NAME 111 112static int queue_state_show(void *data, struct seq_file *m) 113{ 114 struct request_queue *q = data; 115 116 blk_flags_show(m, q->queue_flags, blk_queue_flag_name, 117 ARRAY_SIZE(blk_queue_flag_name)); 118 seq_puts(m, "\n"); 119 return 0; 120} 121 122static ssize_t queue_state_write(void *data, const char __user *buf, 123 size_t count, loff_t *ppos) 124{ 125 struct request_queue *q = data; 126 char opbuf[16] = { }, *op; 127 128 /* 129 * The "state" attribute is removed when the queue is removed. Don't 130 * allow setting the state on a dying queue to avoid a use-after-free. 131 */ 132 if (blk_queue_dying(q)) 133 return -ENOENT; 134 135 if (count >= sizeof(opbuf)) { 136 pr_err("%s: operation too long\n", __func__); 137 goto inval; 138 } 139 140 if (copy_from_user(opbuf, buf, count)) 141 return -EFAULT; 142 op = strstrip(opbuf); 143 if (strcmp(op, "run") == 0) { 144 blk_mq_run_hw_queues(q, true); 145 } else if (strcmp(op, "start") == 0) { 146 blk_mq_start_stopped_hw_queues(q, true); 147 } else if (strcmp(op, "kick") == 0) { 148 blk_mq_kick_requeue_list(q); 149 } else { 150 pr_err("%s: unsupported operation '%s'\n", __func__, op); 151inval: 152 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); 153 return -EINVAL; 154 } 155 return count; 156} 157 158static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { 159 { "poll_stat", 0400, queue_poll_stat_show }, 160 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, 161 { "pm_only", 0600, queue_pm_only_show, NULL }, 162 { "state", 0600, queue_state_show, queue_state_write }, 163 { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, 164 { }, 165}; 166 167#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name 168static const char *const hctx_state_name[] = { 169 HCTX_STATE_NAME(STOPPED), 170 HCTX_STATE_NAME(TAG_ACTIVE), 171 HCTX_STATE_NAME(SCHED_RESTART), 172 HCTX_STATE_NAME(INACTIVE), 173}; 174#undef HCTX_STATE_NAME 175 176static int hctx_state_show(void *data, struct seq_file *m) 177{ 178 struct blk_mq_hw_ctx *hctx = data; 179 180 blk_flags_show(m, hctx->state, hctx_state_name, 181 ARRAY_SIZE(hctx_state_name)); 182 seq_puts(m, "\n"); 183 return 0; 184} 185 186#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name 187static const char *const alloc_policy_name[] = { 188 BLK_TAG_ALLOC_NAME(FIFO), 189 BLK_TAG_ALLOC_NAME(RR), 190}; 191#undef BLK_TAG_ALLOC_NAME 192 193#define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name 194static const char *const hctx_flag_name[] = { 195 HCTX_FLAG_NAME(SHOULD_MERGE), 196 HCTX_FLAG_NAME(TAG_QUEUE_SHARED), 197 HCTX_FLAG_NAME(BLOCKING), 198 HCTX_FLAG_NAME(NO_SCHED), 199 HCTX_FLAG_NAME(STACKING), 200 HCTX_FLAG_NAME(TAG_HCTX_SHARED), 201}; 202#undef HCTX_FLAG_NAME 203 204static int hctx_flags_show(void *data, struct seq_file *m) 205{ 206 struct blk_mq_hw_ctx *hctx = data; 207 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); 208 209 seq_puts(m, "alloc_policy="); 210 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && 211 alloc_policy_name[alloc_policy]) 212 seq_puts(m, alloc_policy_name[alloc_policy]); 213 else 214 seq_printf(m, "%d", alloc_policy); 215 seq_puts(m, " "); 216 blk_flags_show(m, 217 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), 218 hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); 219 seq_puts(m, "\n"); 220 return 0; 221} 222 223#define CMD_FLAG_NAME(name) [__REQ_##name] = #name 224static const char *const cmd_flag_name[] = { 225 CMD_FLAG_NAME(FAILFAST_DEV), 226 CMD_FLAG_NAME(FAILFAST_TRANSPORT), 227 CMD_FLAG_NAME(FAILFAST_DRIVER), 228 CMD_FLAG_NAME(SYNC), 229 CMD_FLAG_NAME(META), 230 CMD_FLAG_NAME(PRIO), 231 CMD_FLAG_NAME(NOMERGE), 232 CMD_FLAG_NAME(IDLE), 233 CMD_FLAG_NAME(INTEGRITY), 234 CMD_FLAG_NAME(FUA), 235 CMD_FLAG_NAME(PREFLUSH), 236 CMD_FLAG_NAME(RAHEAD), 237 CMD_FLAG_NAME(BACKGROUND), 238 CMD_FLAG_NAME(NOWAIT), 239 CMD_FLAG_NAME(NOUNMAP), 240 CMD_FLAG_NAME(POLLED), 241}; 242#undef CMD_FLAG_NAME 243 244#define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name 245static const char *const rqf_name[] = { 246 RQF_NAME(STARTED), 247 RQF_NAME(FLUSH_SEQ), 248 RQF_NAME(MIXED_MERGE), 249 RQF_NAME(MQ_INFLIGHT), 250 RQF_NAME(DONTPREP), 251 RQF_NAME(SCHED_TAGS), 252 RQF_NAME(USE_SCHED), 253 RQF_NAME(FAILED), 254 RQF_NAME(QUIET), 255 RQF_NAME(IO_STAT), 256 RQF_NAME(PM), 257 RQF_NAME(HASHED), 258 RQF_NAME(STATS), 259 RQF_NAME(SPECIAL_PAYLOAD), 260 RQF_NAME(ZONE_WRITE_LOCKED), 261 RQF_NAME(TIMED_OUT), 262 RQF_NAME(RESV), 263}; 264#undef RQF_NAME 265 266static const char *const blk_mq_rq_state_name_array[] = { 267 [MQ_RQ_IDLE] = "idle", 268 [MQ_RQ_IN_FLIGHT] = "in_flight", 269 [MQ_RQ_COMPLETE] = "complete", 270}; 271 272static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) 273{ 274 if (WARN_ON_ONCE((unsigned int)rq_state >= 275 ARRAY_SIZE(blk_mq_rq_state_name_array))) 276 return "(?)"; 277 return blk_mq_rq_state_name_array[rq_state]; 278} 279 280int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) 281{ 282 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; 283 const enum req_op op = req_op(rq); 284 const char *op_str = blk_op_str(op); 285 286 seq_printf(m, "%p {.op=", rq); 287 if (strcmp(op_str, "UNKNOWN") == 0) 288 seq_printf(m, "%u", op); 289 else 290 seq_printf(m, "%s", op_str); 291 seq_puts(m, ", .cmd_flags="); 292 blk_flags_show(m, (__force unsigned int)(rq->cmd_flags & ~REQ_OP_MASK), 293 cmd_flag_name, ARRAY_SIZE(cmd_flag_name)); 294 seq_puts(m, ", .rq_flags="); 295 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, 296 ARRAY_SIZE(rqf_name)); 297 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); 298 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, 299 rq->internal_tag); 300 if (mq_ops->show_rq) 301 mq_ops->show_rq(m, rq); 302 seq_puts(m, "}\n"); 303 return 0; 304} 305EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); 306 307int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) 308{ 309 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); 310} 311EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); 312 313static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) 314 __acquires(&hctx->lock) 315{ 316 struct blk_mq_hw_ctx *hctx = m->private; 317 318 spin_lock(&hctx->lock); 319 return seq_list_start(&hctx->dispatch, *pos); 320} 321 322static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) 323{ 324 struct blk_mq_hw_ctx *hctx = m->private; 325 326 return seq_list_next(v, &hctx->dispatch, pos); 327} 328 329static void hctx_dispatch_stop(struct seq_file *m, void *v) 330 __releases(&hctx->lock) 331{ 332 struct blk_mq_hw_ctx *hctx = m->private; 333 334 spin_unlock(&hctx->lock); 335} 336 337static const struct seq_operations hctx_dispatch_seq_ops = { 338 .start = hctx_dispatch_start, 339 .next = hctx_dispatch_next, 340 .stop = hctx_dispatch_stop, 341 .show = blk_mq_debugfs_rq_show, 342}; 343 344struct show_busy_params { 345 struct seq_file *m; 346 struct blk_mq_hw_ctx *hctx; 347}; 348 349/* 350 * Note: the state of a request may change while this function is in progress, 351 * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to 352 * keep iterating requests. 353 */ 354static bool hctx_show_busy_rq(struct request *rq, void *data) 355{ 356 const struct show_busy_params *params = data; 357 358 if (rq->mq_hctx == params->hctx) 359 __blk_mq_debugfs_rq_show(params->m, rq); 360 361 return true; 362} 363 364static int hctx_busy_show(void *data, struct seq_file *m) 365{ 366 struct blk_mq_hw_ctx *hctx = data; 367 struct show_busy_params params = { .m = m, .hctx = hctx }; 368 369 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, 370 ¶ms); 371 372 return 0; 373} 374 375static const char *const hctx_types[] = { 376 [HCTX_TYPE_DEFAULT] = "default", 377 [HCTX_TYPE_READ] = "read", 378 [HCTX_TYPE_POLL] = "poll", 379}; 380 381static int hctx_type_show(void *data, struct seq_file *m) 382{ 383 struct blk_mq_hw_ctx *hctx = data; 384 385 BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); 386 seq_printf(m, "%s\n", hctx_types[hctx->type]); 387 return 0; 388} 389 390static int hctx_ctx_map_show(void *data, struct seq_file *m) 391{ 392 struct blk_mq_hw_ctx *hctx = data; 393 394 sbitmap_bitmap_show(&hctx->ctx_map, m); 395 return 0; 396} 397 398static void blk_mq_debugfs_tags_show(struct seq_file *m, 399 struct blk_mq_tags *tags) 400{ 401 seq_printf(m, "nr_tags=%u\n", tags->nr_tags); 402 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); 403 seq_printf(m, "active_queues=%d\n", 404 READ_ONCE(tags->active_queues)); 405 406 seq_puts(m, "\nbitmap_tags:\n"); 407 sbitmap_queue_show(&tags->bitmap_tags, m); 408 409 if (tags->nr_reserved_tags) { 410 seq_puts(m, "\nbreserved_tags:\n"); 411 sbitmap_queue_show(&tags->breserved_tags, m); 412 } 413} 414 415static int hctx_tags_show(void *data, struct seq_file *m) 416{ 417 struct blk_mq_hw_ctx *hctx = data; 418 struct request_queue *q = hctx->queue; 419 int res; 420 421 res = mutex_lock_interruptible(&q->sysfs_lock); 422 if (res) 423 goto out; 424 if (hctx->tags) 425 blk_mq_debugfs_tags_show(m, hctx->tags); 426 mutex_unlock(&q->sysfs_lock); 427 428out: 429 return res; 430} 431 432static int hctx_tags_bitmap_show(void *data, struct seq_file *m) 433{ 434 struct blk_mq_hw_ctx *hctx = data; 435 struct request_queue *q = hctx->queue; 436 int res; 437 438 res = mutex_lock_interruptible(&q->sysfs_lock); 439 if (res) 440 goto out; 441 if (hctx->tags) 442 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); 443 mutex_unlock(&q->sysfs_lock); 444 445out: 446 return res; 447} 448 449static int hctx_sched_tags_show(void *data, struct seq_file *m) 450{ 451 struct blk_mq_hw_ctx *hctx = data; 452 struct request_queue *q = hctx->queue; 453 int res; 454 455 res = mutex_lock_interruptible(&q->sysfs_lock); 456 if (res) 457 goto out; 458 if (hctx->sched_tags) 459 blk_mq_debugfs_tags_show(m, hctx->sched_tags); 460 mutex_unlock(&q->sysfs_lock); 461 462out: 463 return res; 464} 465 466static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) 467{ 468 struct blk_mq_hw_ctx *hctx = data; 469 struct request_queue *q = hctx->queue; 470 int res; 471 472 res = mutex_lock_interruptible(&q->sysfs_lock); 473 if (res) 474 goto out; 475 if (hctx->sched_tags) 476 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); 477 mutex_unlock(&q->sysfs_lock); 478 479out: 480 return res; 481} 482 483static int hctx_run_show(void *data, struct seq_file *m) 484{ 485 struct blk_mq_hw_ctx *hctx = data; 486 487 seq_printf(m, "%lu\n", hctx->run); 488 return 0; 489} 490 491static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, 492 loff_t *ppos) 493{ 494 struct blk_mq_hw_ctx *hctx = data; 495 496 hctx->run = 0; 497 return count; 498} 499 500static int hctx_active_show(void *data, struct seq_file *m) 501{ 502 struct blk_mq_hw_ctx *hctx = data; 503 504 seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); 505 return 0; 506} 507 508static int hctx_dispatch_busy_show(void *data, struct seq_file *m) 509{ 510 struct blk_mq_hw_ctx *hctx = data; 511 512 seq_printf(m, "%u\n", hctx->dispatch_busy); 513 return 0; 514} 515 516#define CTX_RQ_SEQ_OPS(name, type) \ 517static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ 518 __acquires(&ctx->lock) \ 519{ \ 520 struct blk_mq_ctx *ctx = m->private; \ 521 \ 522 spin_lock(&ctx->lock); \ 523 return seq_list_start(&ctx->rq_lists[type], *pos); \ 524} \ 525 \ 526static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ 527 loff_t *pos) \ 528{ \ 529 struct blk_mq_ctx *ctx = m->private; \ 530 \ 531 return seq_list_next(v, &ctx->rq_lists[type], pos); \ 532} \ 533 \ 534static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ 535 __releases(&ctx->lock) \ 536{ \ 537 struct blk_mq_ctx *ctx = m->private; \ 538 \ 539 spin_unlock(&ctx->lock); \ 540} \ 541 \ 542static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ 543 .start = ctx_##name##_rq_list_start, \ 544 .next = ctx_##name##_rq_list_next, \ 545 .stop = ctx_##name##_rq_list_stop, \ 546 .show = blk_mq_debugfs_rq_show, \ 547} 548 549CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); 550CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); 551CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); 552 553static int blk_mq_debugfs_show(struct seq_file *m, void *v) 554{ 555 const struct blk_mq_debugfs_attr *attr = m->private; 556 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; 557 558 return attr->show(data, m); 559} 560 561static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, 562 size_t count, loff_t *ppos) 563{ 564 struct seq_file *m = file->private_data; 565 const struct blk_mq_debugfs_attr *attr = m->private; 566 void *data = d_inode(file->f_path.dentry->d_parent)->i_private; 567 568 /* 569 * Attributes that only implement .seq_ops are read-only and 'attr' is 570 * the same with 'data' in this case. 571 */ 572 if (attr == data || !attr->write) 573 return -EPERM; 574 575 return attr->write(data, buf, count, ppos); 576} 577 578static int blk_mq_debugfs_open(struct inode *inode, struct file *file) 579{ 580 const struct blk_mq_debugfs_attr *attr = inode->i_private; 581 void *data = d_inode(file->f_path.dentry->d_parent)->i_private; 582 struct seq_file *m; 583 int ret; 584 585 if (attr->seq_ops) { 586 ret = seq_open(file, attr->seq_ops); 587 if (!ret) { 588 m = file->private_data; 589 m->private = data; 590 } 591 return ret; 592 } 593 594 if (WARN_ON_ONCE(!attr->show)) 595 return -EPERM; 596 597 return single_open(file, blk_mq_debugfs_show, inode->i_private); 598} 599 600static int blk_mq_debugfs_release(struct inode *inode, struct file *file) 601{ 602 const struct blk_mq_debugfs_attr *attr = inode->i_private; 603 604 if (attr->show) 605 return single_release(inode, file); 606 607 return seq_release(inode, file); 608} 609 610static const struct file_operations blk_mq_debugfs_fops = { 611 .open = blk_mq_debugfs_open, 612 .read = seq_read, 613 .write = blk_mq_debugfs_write, 614 .llseek = seq_lseek, 615 .release = blk_mq_debugfs_release, 616}; 617 618static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { 619 {"state", 0400, hctx_state_show}, 620 {"flags", 0400, hctx_flags_show}, 621 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, 622 {"busy", 0400, hctx_busy_show}, 623 {"ctx_map", 0400, hctx_ctx_map_show}, 624 {"tags", 0400, hctx_tags_show}, 625 {"tags_bitmap", 0400, hctx_tags_bitmap_show}, 626 {"sched_tags", 0400, hctx_sched_tags_show}, 627 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, 628 {"run", 0600, hctx_run_show, hctx_run_write}, 629 {"active", 0400, hctx_active_show}, 630 {"dispatch_busy", 0400, hctx_dispatch_busy_show}, 631 {"type", 0400, hctx_type_show}, 632 {}, 633}; 634 635static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { 636 {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, 637 {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, 638 {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, 639 {}, 640}; 641 642static void debugfs_create_files(struct dentry *parent, void *data, 643 const struct blk_mq_debugfs_attr *attr) 644{ 645 if (IS_ERR_OR_NULL(parent)) 646 return; 647 648 d_inode(parent)->i_private = data; 649 650 for (; attr->name; attr++) 651 debugfs_create_file(attr->name, attr->mode, parent, 652 (void *)attr, &blk_mq_debugfs_fops); 653} 654 655void blk_mq_debugfs_register(struct request_queue *q) 656{ 657 struct blk_mq_hw_ctx *hctx; 658 unsigned long i; 659 660 debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); 661 662 /* 663 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir 664 * didn't exist yet (because we don't know what to name the directory 665 * until the queue is registered to a gendisk). 666 */ 667 if (q->elevator && !q->sched_debugfs_dir) 668 blk_mq_debugfs_register_sched(q); 669 670 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ 671 queue_for_each_hw_ctx(q, hctx, i) { 672 if (!hctx->debugfs_dir) 673 blk_mq_debugfs_register_hctx(q, hctx); 674 if (q->elevator && !hctx->sched_debugfs_dir) 675 blk_mq_debugfs_register_sched_hctx(q, hctx); 676 } 677 678 if (q->rq_qos) { 679 struct rq_qos *rqos = q->rq_qos; 680 681 while (rqos) { 682 blk_mq_debugfs_register_rqos(rqos); 683 rqos = rqos->next; 684 } 685 } 686} 687 688static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, 689 struct blk_mq_ctx *ctx) 690{ 691 struct dentry *ctx_dir; 692 char name[20]; 693 694 snprintf(name, sizeof(name), "cpu%u", ctx->cpu); 695 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); 696 697 debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); 698} 699 700void blk_mq_debugfs_register_hctx(struct request_queue *q, 701 struct blk_mq_hw_ctx *hctx) 702{ 703 struct blk_mq_ctx *ctx; 704 char name[20]; 705 int i; 706 707 if (!q->debugfs_dir) 708 return; 709 710 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); 711 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); 712 713 debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); 714 715 hctx_for_each_ctx(hctx, ctx, i) 716 blk_mq_debugfs_register_ctx(hctx, ctx); 717} 718 719void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) 720{ 721 if (!hctx->queue->debugfs_dir) 722 return; 723 debugfs_remove_recursive(hctx->debugfs_dir); 724 hctx->sched_debugfs_dir = NULL; 725 hctx->debugfs_dir = NULL; 726} 727 728void blk_mq_debugfs_register_hctxs(struct request_queue *q) 729{ 730 struct blk_mq_hw_ctx *hctx; 731 unsigned long i; 732 733 queue_for_each_hw_ctx(q, hctx, i) 734 blk_mq_debugfs_register_hctx(q, hctx); 735} 736 737void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) 738{ 739 struct blk_mq_hw_ctx *hctx; 740 unsigned long i; 741 742 queue_for_each_hw_ctx(q, hctx, i) 743 blk_mq_debugfs_unregister_hctx(hctx); 744} 745 746void blk_mq_debugfs_register_sched(struct request_queue *q) 747{ 748 struct elevator_type *e = q->elevator->type; 749 750 lockdep_assert_held(&q->debugfs_mutex); 751 752 /* 753 * If the parent directory has not been created yet, return, we will be 754 * called again later on and the directory/files will be created then. 755 */ 756 if (!q->debugfs_dir) 757 return; 758 759 if (!e->queue_debugfs_attrs) 760 return; 761 762 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); 763 764 debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); 765} 766 767void blk_mq_debugfs_unregister_sched(struct request_queue *q) 768{ 769 lockdep_assert_held(&q->debugfs_mutex); 770 771 debugfs_remove_recursive(q->sched_debugfs_dir); 772 q->sched_debugfs_dir = NULL; 773} 774 775static const char *rq_qos_id_to_name(enum rq_qos_id id) 776{ 777 switch (id) { 778 case RQ_QOS_WBT: 779 return "wbt"; 780 case RQ_QOS_LATENCY: 781 return "latency"; 782 case RQ_QOS_COST: 783 return "cost"; 784 } 785 return "unknown"; 786} 787 788void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) 789{ 790 lockdep_assert_held(&rqos->disk->queue->debugfs_mutex); 791 792 if (!rqos->disk->queue->debugfs_dir) 793 return; 794 debugfs_remove_recursive(rqos->debugfs_dir); 795 rqos->debugfs_dir = NULL; 796} 797 798void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) 799{ 800 struct request_queue *q = rqos->disk->queue; 801 const char *dir_name = rq_qos_id_to_name(rqos->id); 802 803 lockdep_assert_held(&q->debugfs_mutex); 804 805 if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) 806 return; 807 808 if (!q->rqos_debugfs_dir) 809 q->rqos_debugfs_dir = debugfs_create_dir("rqos", 810 q->debugfs_dir); 811 812 rqos->debugfs_dir = debugfs_create_dir(dir_name, q->rqos_debugfs_dir); 813 debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); 814} 815 816void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, 817 struct blk_mq_hw_ctx *hctx) 818{ 819 struct elevator_type *e = q->elevator->type; 820 821 lockdep_assert_held(&q->debugfs_mutex); 822 823 /* 824 * If the parent debugfs directory has not been created yet, return; 825 * We will be called again later on with appropriate parent debugfs 826 * directory from blk_register_queue() 827 */ 828 if (!hctx->debugfs_dir) 829 return; 830 831 if (!e->hctx_debugfs_attrs) 832 return; 833 834 hctx->sched_debugfs_dir = debugfs_create_dir("sched", 835 hctx->debugfs_dir); 836 debugfs_create_files(hctx->sched_debugfs_dir, hctx, 837 e->hctx_debugfs_attrs); 838} 839 840void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) 841{ 842 lockdep_assert_held(&hctx->queue->debugfs_mutex); 843 844 if (!hctx->queue->debugfs_dir) 845 return; 846 debugfs_remove_recursive(hctx->sched_debugfs_dir); 847 hctx->sched_debugfs_dir = NULL; 848} 849