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(DONTPREP), 250 RQF_NAME(SCHED_TAGS), 251 RQF_NAME(USE_SCHED), 252 RQF_NAME(FAILED), 253 RQF_NAME(QUIET), 254 RQF_NAME(IO_STAT), 255 RQF_NAME(PM), 256 RQF_NAME(HASHED), 257 RQF_NAME(STATS), 258 RQF_NAME(SPECIAL_PAYLOAD), 259 RQF_NAME(ZONE_WRITE_LOCKED), 260 RQF_NAME(TIMED_OUT), 261 RQF_NAME(RESV), 262}; 263#undef RQF_NAME 264 265static const char *const blk_mq_rq_state_name_array[] = { 266 [MQ_RQ_IDLE] = "idle", 267 [MQ_RQ_IN_FLIGHT] = "in_flight", 268 [MQ_RQ_COMPLETE] = "complete", 269}; 270 271static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) 272{ 273 if (WARN_ON_ONCE((unsigned int)rq_state >= 274 ARRAY_SIZE(blk_mq_rq_state_name_array))) 275 return "(?)"; 276 return blk_mq_rq_state_name_array[rq_state]; 277} 278 279int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) 280{ 281 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; 282 const enum req_op op = req_op(rq); 283 const char *op_str = blk_op_str(op); 284 285 seq_printf(m, "%p {.op=", rq); 286 if (strcmp(op_str, "UNKNOWN") == 0) 287 seq_printf(m, "%u", op); 288 else 289 seq_printf(m, "%s", op_str); 290 seq_puts(m, ", .cmd_flags="); 291 blk_flags_show(m, (__force unsigned int)(rq->cmd_flags & ~REQ_OP_MASK), 292 cmd_flag_name, ARRAY_SIZE(cmd_flag_name)); 293 seq_puts(m, ", .rq_flags="); 294 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, 295 ARRAY_SIZE(rqf_name)); 296 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); 297 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, 298 rq->internal_tag); 299 if (mq_ops->show_rq) 300 mq_ops->show_rq(m, rq); 301 seq_puts(m, "}\n"); 302 return 0; 303} 304EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); 305 306int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) 307{ 308 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); 309} 310EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); 311 312static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) 313 __acquires(&hctx->lock) 314{ 315 struct blk_mq_hw_ctx *hctx = m->private; 316 317 spin_lock(&hctx->lock); 318 return seq_list_start(&hctx->dispatch, *pos); 319} 320 321static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) 322{ 323 struct blk_mq_hw_ctx *hctx = m->private; 324 325 return seq_list_next(v, &hctx->dispatch, pos); 326} 327 328static void hctx_dispatch_stop(struct seq_file *m, void *v) 329 __releases(&hctx->lock) 330{ 331 struct blk_mq_hw_ctx *hctx = m->private; 332 333 spin_unlock(&hctx->lock); 334} 335 336static const struct seq_operations hctx_dispatch_seq_ops = { 337 .start = hctx_dispatch_start, 338 .next = hctx_dispatch_next, 339 .stop = hctx_dispatch_stop, 340 .show = blk_mq_debugfs_rq_show, 341}; 342 343struct show_busy_params { 344 struct seq_file *m; 345 struct blk_mq_hw_ctx *hctx; 346}; 347 348/* 349 * Note: the state of a request may change while this function is in progress, 350 * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to 351 * keep iterating requests. 352 */ 353static bool hctx_show_busy_rq(struct request *rq, void *data) 354{ 355 const struct show_busy_params *params = data; 356 357 if (rq->mq_hctx == params->hctx) 358 __blk_mq_debugfs_rq_show(params->m, rq); 359 360 return true; 361} 362 363static int hctx_busy_show(void *data, struct seq_file *m) 364{ 365 struct blk_mq_hw_ctx *hctx = data; 366 struct show_busy_params params = { .m = m, .hctx = hctx }; 367 368 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, 369 ¶ms); 370 371 return 0; 372} 373 374static const char *const hctx_types[] = { 375 [HCTX_TYPE_DEFAULT] = "default", 376 [HCTX_TYPE_READ] = "read", 377 [HCTX_TYPE_POLL] = "poll", 378}; 379 380static int hctx_type_show(void *data, struct seq_file *m) 381{ 382 struct blk_mq_hw_ctx *hctx = data; 383 384 BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); 385 seq_printf(m, "%s\n", hctx_types[hctx->type]); 386 return 0; 387} 388 389static int hctx_ctx_map_show(void *data, struct seq_file *m) 390{ 391 struct blk_mq_hw_ctx *hctx = data; 392 393 sbitmap_bitmap_show(&hctx->ctx_map, m); 394 return 0; 395} 396 397static void blk_mq_debugfs_tags_show(struct seq_file *m, 398 struct blk_mq_tags *tags) 399{ 400 seq_printf(m, "nr_tags=%u\n", tags->nr_tags); 401 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); 402 seq_printf(m, "active_queues=%d\n", 403 READ_ONCE(tags->active_queues)); 404 405 seq_puts(m, "\nbitmap_tags:\n"); 406 sbitmap_queue_show(&tags->bitmap_tags, m); 407 408 if (tags->nr_reserved_tags) { 409 seq_puts(m, "\nbreserved_tags:\n"); 410 sbitmap_queue_show(&tags->breserved_tags, m); 411 } 412} 413 414static int hctx_tags_show(void *data, struct seq_file *m) 415{ 416 struct blk_mq_hw_ctx *hctx = data; 417 struct request_queue *q = hctx->queue; 418 int res; 419 420 res = mutex_lock_interruptible(&q->sysfs_lock); 421 if (res) 422 goto out; 423 if (hctx->tags) 424 blk_mq_debugfs_tags_show(m, hctx->tags); 425 mutex_unlock(&q->sysfs_lock); 426 427out: 428 return res; 429} 430 431static int hctx_tags_bitmap_show(void *data, struct seq_file *m) 432{ 433 struct blk_mq_hw_ctx *hctx = data; 434 struct request_queue *q = hctx->queue; 435 int res; 436 437 res = mutex_lock_interruptible(&q->sysfs_lock); 438 if (res) 439 goto out; 440 if (hctx->tags) 441 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); 442 mutex_unlock(&q->sysfs_lock); 443 444out: 445 return res; 446} 447 448static int hctx_sched_tags_show(void *data, struct seq_file *m) 449{ 450 struct blk_mq_hw_ctx *hctx = data; 451 struct request_queue *q = hctx->queue; 452 int res; 453 454 res = mutex_lock_interruptible(&q->sysfs_lock); 455 if (res) 456 goto out; 457 if (hctx->sched_tags) 458 blk_mq_debugfs_tags_show(m, hctx->sched_tags); 459 mutex_unlock(&q->sysfs_lock); 460 461out: 462 return res; 463} 464 465static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) 466{ 467 struct blk_mq_hw_ctx *hctx = data; 468 struct request_queue *q = hctx->queue; 469 int res; 470 471 res = mutex_lock_interruptible(&q->sysfs_lock); 472 if (res) 473 goto out; 474 if (hctx->sched_tags) 475 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); 476 mutex_unlock(&q->sysfs_lock); 477 478out: 479 return res; 480} 481 482static int hctx_active_show(void *data, struct seq_file *m) 483{ 484 struct blk_mq_hw_ctx *hctx = data; 485 486 seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); 487 return 0; 488} 489 490static int hctx_dispatch_busy_show(void *data, struct seq_file *m) 491{ 492 struct blk_mq_hw_ctx *hctx = data; 493 494 seq_printf(m, "%u\n", hctx->dispatch_busy); 495 return 0; 496} 497 498#define CTX_RQ_SEQ_OPS(name, type) \ 499static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ 500 __acquires(&ctx->lock) \ 501{ \ 502 struct blk_mq_ctx *ctx = m->private; \ 503 \ 504 spin_lock(&ctx->lock); \ 505 return seq_list_start(&ctx->rq_lists[type], *pos); \ 506} \ 507 \ 508static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ 509 loff_t *pos) \ 510{ \ 511 struct blk_mq_ctx *ctx = m->private; \ 512 \ 513 return seq_list_next(v, &ctx->rq_lists[type], pos); \ 514} \ 515 \ 516static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ 517 __releases(&ctx->lock) \ 518{ \ 519 struct blk_mq_ctx *ctx = m->private; \ 520 \ 521 spin_unlock(&ctx->lock); \ 522} \ 523 \ 524static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ 525 .start = ctx_##name##_rq_list_start, \ 526 .next = ctx_##name##_rq_list_next, \ 527 .stop = ctx_##name##_rq_list_stop, \ 528 .show = blk_mq_debugfs_rq_show, \ 529} 530 531CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); 532CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); 533CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); 534 535static int blk_mq_debugfs_show(struct seq_file *m, void *v) 536{ 537 const struct blk_mq_debugfs_attr *attr = m->private; 538 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; 539 540 return attr->show(data, m); 541} 542 543static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, 544 size_t count, loff_t *ppos) 545{ 546 struct seq_file *m = file->private_data; 547 const struct blk_mq_debugfs_attr *attr = m->private; 548 void *data = d_inode(file->f_path.dentry->d_parent)->i_private; 549 550 /* 551 * Attributes that only implement .seq_ops are read-only and 'attr' is 552 * the same with 'data' in this case. 553 */ 554 if (attr == data || !attr->write) 555 return -EPERM; 556 557 return attr->write(data, buf, count, ppos); 558} 559 560static int blk_mq_debugfs_open(struct inode *inode, struct file *file) 561{ 562 const struct blk_mq_debugfs_attr *attr = inode->i_private; 563 void *data = d_inode(file->f_path.dentry->d_parent)->i_private; 564 struct seq_file *m; 565 int ret; 566 567 if (attr->seq_ops) { 568 ret = seq_open(file, attr->seq_ops); 569 if (!ret) { 570 m = file->private_data; 571 m->private = data; 572 } 573 return ret; 574 } 575 576 if (WARN_ON_ONCE(!attr->show)) 577 return -EPERM; 578 579 return single_open(file, blk_mq_debugfs_show, inode->i_private); 580} 581 582static int blk_mq_debugfs_release(struct inode *inode, struct file *file) 583{ 584 const struct blk_mq_debugfs_attr *attr = inode->i_private; 585 586 if (attr->show) 587 return single_release(inode, file); 588 589 return seq_release(inode, file); 590} 591 592static const struct file_operations blk_mq_debugfs_fops = { 593 .open = blk_mq_debugfs_open, 594 .read = seq_read, 595 .write = blk_mq_debugfs_write, 596 .llseek = seq_lseek, 597 .release = blk_mq_debugfs_release, 598}; 599 600static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { 601 {"state", 0400, hctx_state_show}, 602 {"flags", 0400, hctx_flags_show}, 603 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, 604 {"busy", 0400, hctx_busy_show}, 605 {"ctx_map", 0400, hctx_ctx_map_show}, 606 {"tags", 0400, hctx_tags_show}, 607 {"tags_bitmap", 0400, hctx_tags_bitmap_show}, 608 {"sched_tags", 0400, hctx_sched_tags_show}, 609 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, 610 {"active", 0400, hctx_active_show}, 611 {"dispatch_busy", 0400, hctx_dispatch_busy_show}, 612 {"type", 0400, hctx_type_show}, 613 {}, 614}; 615 616static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { 617 {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, 618 {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, 619 {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, 620 {}, 621}; 622 623static void debugfs_create_files(struct dentry *parent, void *data, 624 const struct blk_mq_debugfs_attr *attr) 625{ 626 if (IS_ERR_OR_NULL(parent)) 627 return; 628 629 d_inode(parent)->i_private = data; 630 631 for (; attr->name; attr++) 632 debugfs_create_file(attr->name, attr->mode, parent, 633 (void *)attr, &blk_mq_debugfs_fops); 634} 635 636void blk_mq_debugfs_register(struct request_queue *q) 637{ 638 struct blk_mq_hw_ctx *hctx; 639 unsigned long i; 640 641 debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); 642 643 /* 644 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir 645 * didn't exist yet (because we don't know what to name the directory 646 * until the queue is registered to a gendisk). 647 */ 648 if (q->elevator && !q->sched_debugfs_dir) 649 blk_mq_debugfs_register_sched(q); 650 651 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ 652 queue_for_each_hw_ctx(q, hctx, i) { 653 if (!hctx->debugfs_dir) 654 blk_mq_debugfs_register_hctx(q, hctx); 655 if (q->elevator && !hctx->sched_debugfs_dir) 656 blk_mq_debugfs_register_sched_hctx(q, hctx); 657 } 658 659 if (q->rq_qos) { 660 struct rq_qos *rqos = q->rq_qos; 661 662 while (rqos) { 663 blk_mq_debugfs_register_rqos(rqos); 664 rqos = rqos->next; 665 } 666 } 667} 668 669static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, 670 struct blk_mq_ctx *ctx) 671{ 672 struct dentry *ctx_dir; 673 char name[20]; 674 675 snprintf(name, sizeof(name), "cpu%u", ctx->cpu); 676 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); 677 678 debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); 679} 680 681void blk_mq_debugfs_register_hctx(struct request_queue *q, 682 struct blk_mq_hw_ctx *hctx) 683{ 684 struct blk_mq_ctx *ctx; 685 char name[20]; 686 int i; 687 688 if (!q->debugfs_dir) 689 return; 690 691 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); 692 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); 693 694 debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); 695 696 hctx_for_each_ctx(hctx, ctx, i) 697 blk_mq_debugfs_register_ctx(hctx, ctx); 698} 699 700void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) 701{ 702 if (!hctx->queue->debugfs_dir) 703 return; 704 debugfs_remove_recursive(hctx->debugfs_dir); 705 hctx->sched_debugfs_dir = NULL; 706 hctx->debugfs_dir = NULL; 707} 708 709void blk_mq_debugfs_register_hctxs(struct request_queue *q) 710{ 711 struct blk_mq_hw_ctx *hctx; 712 unsigned long i; 713 714 queue_for_each_hw_ctx(q, hctx, i) 715 blk_mq_debugfs_register_hctx(q, hctx); 716} 717 718void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) 719{ 720 struct blk_mq_hw_ctx *hctx; 721 unsigned long i; 722 723 queue_for_each_hw_ctx(q, hctx, i) 724 blk_mq_debugfs_unregister_hctx(hctx); 725} 726 727void blk_mq_debugfs_register_sched(struct request_queue *q) 728{ 729 struct elevator_type *e = q->elevator->type; 730 731 lockdep_assert_held(&q->debugfs_mutex); 732 733 /* 734 * If the parent directory has not been created yet, return, we will be 735 * called again later on and the directory/files will be created then. 736 */ 737 if (!q->debugfs_dir) 738 return; 739 740 if (!e->queue_debugfs_attrs) 741 return; 742 743 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); 744 745 debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); 746} 747 748void blk_mq_debugfs_unregister_sched(struct request_queue *q) 749{ 750 lockdep_assert_held(&q->debugfs_mutex); 751 752 debugfs_remove_recursive(q->sched_debugfs_dir); 753 q->sched_debugfs_dir = NULL; 754} 755 756static const char *rq_qos_id_to_name(enum rq_qos_id id) 757{ 758 switch (id) { 759 case RQ_QOS_WBT: 760 return "wbt"; 761 case RQ_QOS_LATENCY: 762 return "latency"; 763 case RQ_QOS_COST: 764 return "cost"; 765 } 766 return "unknown"; 767} 768 769void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) 770{ 771 lockdep_assert_held(&rqos->disk->queue->debugfs_mutex); 772 773 if (!rqos->disk->queue->debugfs_dir) 774 return; 775 debugfs_remove_recursive(rqos->debugfs_dir); 776 rqos->debugfs_dir = NULL; 777} 778 779void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) 780{ 781 struct request_queue *q = rqos->disk->queue; 782 const char *dir_name = rq_qos_id_to_name(rqos->id); 783 784 lockdep_assert_held(&q->debugfs_mutex); 785 786 if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) 787 return; 788 789 if (!q->rqos_debugfs_dir) 790 q->rqos_debugfs_dir = debugfs_create_dir("rqos", 791 q->debugfs_dir); 792 793 rqos->debugfs_dir = debugfs_create_dir(dir_name, q->rqos_debugfs_dir); 794 debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); 795} 796 797void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, 798 struct blk_mq_hw_ctx *hctx) 799{ 800 struct elevator_type *e = q->elevator->type; 801 802 lockdep_assert_held(&q->debugfs_mutex); 803 804 /* 805 * If the parent debugfs directory has not been created yet, return; 806 * We will be called again later on with appropriate parent debugfs 807 * directory from blk_register_queue() 808 */ 809 if (!hctx->debugfs_dir) 810 return; 811 812 if (!e->hctx_debugfs_attrs) 813 return; 814 815 hctx->sched_debugfs_dir = debugfs_create_dir("sched", 816 hctx->debugfs_dir); 817 debugfs_create_files(hctx->sched_debugfs_dir, hctx, 818 e->hctx_debugfs_attrs); 819} 820 821void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) 822{ 823 lockdep_assert_held(&hctx->queue->debugfs_mutex); 824 825 if (!hctx->queue->debugfs_dir) 826 return; 827 debugfs_remove_recursive(hctx->sched_debugfs_dir); 828 hctx->sched_debugfs_dir = NULL; 829} 830