2 * Copyright (C) 2017 Facebook
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <https://www.gnu.org/licenses/>.
17 #include <linux/kernel.h>
18 #include <linux/blkdev.h>
19 #include <linux/debugfs.h>
21 #include <linux/blk-mq.h>
24 #include "blk-mq-tag.h"
26 struct blk_mq_debugfs_attr {
29 const struct file_operations *fops;
32 static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file,
33 const struct seq_operations *ops)
38 ret = seq_open(file, ops);
40 m = file->private_data;
41 m->private = inode->i_private;
46 static int blk_flags_show(struct seq_file *m, const unsigned long flags,
47 const char *const *flag_name, int flag_name_count)
52 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
53 if (!(flags & BIT(i)))
58 if (i < flag_name_count && flag_name[i])
59 seq_puts(m, flag_name[i]);
61 seq_printf(m, "%d", i);
66 static const char *const blk_queue_flag_name[] = {
67 [QUEUE_FLAG_QUEUED] = "QUEUED",
68 [QUEUE_FLAG_STOPPED] = "STOPPED",
69 [QUEUE_FLAG_SYNCFULL] = "SYNCFULL",
70 [QUEUE_FLAG_ASYNCFULL] = "ASYNCFULL",
71 [QUEUE_FLAG_DYING] = "DYING",
72 [QUEUE_FLAG_BYPASS] = "BYPASS",
73 [QUEUE_FLAG_BIDI] = "BIDI",
74 [QUEUE_FLAG_NOMERGES] = "NOMERGES",
75 [QUEUE_FLAG_SAME_COMP] = "SAME_COMP",
76 [QUEUE_FLAG_FAIL_IO] = "FAIL_IO",
77 [QUEUE_FLAG_STACKABLE] = "STACKABLE",
78 [QUEUE_FLAG_NONROT] = "NONROT",
79 [QUEUE_FLAG_IO_STAT] = "IO_STAT",
80 [QUEUE_FLAG_DISCARD] = "DISCARD",
81 [QUEUE_FLAG_NOXMERGES] = "NOXMERGES",
82 [QUEUE_FLAG_ADD_RANDOM] = "ADD_RANDOM",
83 [QUEUE_FLAG_SECERASE] = "SECERASE",
84 [QUEUE_FLAG_SAME_FORCE] = "SAME_FORCE",
85 [QUEUE_FLAG_DEAD] = "DEAD",
86 [QUEUE_FLAG_INIT_DONE] = "INIT_DONE",
87 [QUEUE_FLAG_NO_SG_MERGE] = "NO_SG_MERGE",
88 [QUEUE_FLAG_POLL] = "POLL",
89 [QUEUE_FLAG_WC] = "WC",
90 [QUEUE_FLAG_FUA] = "FUA",
91 [QUEUE_FLAG_FLUSH_NQ] = "FLUSH_NQ",
92 [QUEUE_FLAG_DAX] = "DAX",
93 [QUEUE_FLAG_STATS] = "STATS",
94 [QUEUE_FLAG_POLL_STATS] = "POLL_STATS",
95 [QUEUE_FLAG_REGISTERED] = "REGISTERED",
98 static int blk_queue_flags_show(struct seq_file *m, void *v)
100 struct request_queue *q = m->private;
102 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
103 ARRAY_SIZE(blk_queue_flag_name));
108 static ssize_t blk_queue_flags_store(struct file *file, const char __user *ubuf,
109 size_t len, loff_t *offp)
111 struct request_queue *q = file_inode(file)->i_private;
112 char op[16] = { }, *s;
114 len = min(len, sizeof(op) - 1);
115 if (copy_from_user(op, ubuf, len))
118 strsep(&s, " \t\n"); /* strip trailing whitespace */
119 if (strcmp(op, "run") == 0) {
120 blk_mq_run_hw_queues(q, true);
121 } else if (strcmp(op, "start") == 0) {
122 blk_mq_start_stopped_hw_queues(q, true);
124 pr_err("%s: unsupported operation %s. Use either 'run' or 'start'\n",
131 static int blk_queue_flags_open(struct inode *inode, struct file *file)
133 return single_open(file, blk_queue_flags_show, inode->i_private);
136 static const struct file_operations blk_queue_flags_fops = {
137 .open = blk_queue_flags_open,
140 .release = single_release,
141 .write = blk_queue_flags_store,
144 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
146 if (stat->nr_samples) {
147 seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
148 stat->nr_samples, stat->mean, stat->min, stat->max);
150 seq_puts(m, "samples=0");
154 static int queue_poll_stat_show(struct seq_file *m, void *v)
156 struct request_queue *q = m->private;
159 for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
160 seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket));
161 print_stat(m, &q->poll_stat[2*bucket]);
164 seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket));
165 print_stat(m, &q->poll_stat[2*bucket+1]);
171 static int queue_poll_stat_open(struct inode *inode, struct file *file)
173 return single_open(file, queue_poll_stat_show, inode->i_private);
176 static const struct file_operations queue_poll_stat_fops = {
177 .open = queue_poll_stat_open,
180 .release = single_release,
183 static const char *const hctx_state_name[] = {
184 [BLK_MQ_S_STOPPED] = "STOPPED",
185 [BLK_MQ_S_TAG_ACTIVE] = "TAG_ACTIVE",
186 [BLK_MQ_S_SCHED_RESTART] = "SCHED_RESTART",
187 [BLK_MQ_S_TAG_WAITING] = "TAG_WAITING",
190 static int hctx_state_show(struct seq_file *m, void *v)
192 struct blk_mq_hw_ctx *hctx = m->private;
194 blk_flags_show(m, hctx->state, hctx_state_name,
195 ARRAY_SIZE(hctx_state_name));
200 static int hctx_state_open(struct inode *inode, struct file *file)
202 return single_open(file, hctx_state_show, inode->i_private);
205 static const struct file_operations hctx_state_fops = {
206 .open = hctx_state_open,
209 .release = single_release,
212 static const char *const alloc_policy_name[] = {
213 [BLK_TAG_ALLOC_FIFO] = "fifo",
214 [BLK_TAG_ALLOC_RR] = "rr",
217 static const char *const hctx_flag_name[] = {
218 [ilog2(BLK_MQ_F_SHOULD_MERGE)] = "SHOULD_MERGE",
219 [ilog2(BLK_MQ_F_TAG_SHARED)] = "TAG_SHARED",
220 [ilog2(BLK_MQ_F_SG_MERGE)] = "SG_MERGE",
221 [ilog2(BLK_MQ_F_BLOCKING)] = "BLOCKING",
222 [ilog2(BLK_MQ_F_NO_SCHED)] = "NO_SCHED",
225 static int hctx_flags_show(struct seq_file *m, void *v)
227 struct blk_mq_hw_ctx *hctx = m->private;
228 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
230 seq_puts(m, "alloc_policy=");
231 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
232 alloc_policy_name[alloc_policy])
233 seq_puts(m, alloc_policy_name[alloc_policy]);
235 seq_printf(m, "%d", alloc_policy);
238 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
239 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
244 static int hctx_flags_open(struct inode *inode, struct file *file)
246 return single_open(file, hctx_flags_show, inode->i_private);
249 static const struct file_operations hctx_flags_fops = {
250 .open = hctx_flags_open,
253 .release = single_release,
256 static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
258 struct request *rq = list_entry_rq(v);
260 seq_printf(m, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n",
261 rq, rq->cmd_flags, (__force unsigned int)rq->rq_flags,
262 rq->tag, rq->internal_tag);
266 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
267 __acquires(&hctx->lock)
269 struct blk_mq_hw_ctx *hctx = m->private;
271 spin_lock(&hctx->lock);
272 return seq_list_start(&hctx->dispatch, *pos);
275 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
277 struct blk_mq_hw_ctx *hctx = m->private;
279 return seq_list_next(v, &hctx->dispatch, pos);
282 static void hctx_dispatch_stop(struct seq_file *m, void *v)
283 __releases(&hctx->lock)
285 struct blk_mq_hw_ctx *hctx = m->private;
287 spin_unlock(&hctx->lock);
290 static const struct seq_operations hctx_dispatch_seq_ops = {
291 .start = hctx_dispatch_start,
292 .next = hctx_dispatch_next,
293 .stop = hctx_dispatch_stop,
294 .show = blk_mq_debugfs_rq_show,
297 static int hctx_dispatch_open(struct inode *inode, struct file *file)
299 return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops);
302 static const struct file_operations hctx_dispatch_fops = {
303 .open = hctx_dispatch_open,
306 .release = seq_release,
309 static int hctx_ctx_map_show(struct seq_file *m, void *v)
311 struct blk_mq_hw_ctx *hctx = m->private;
313 sbitmap_bitmap_show(&hctx->ctx_map, m);
317 static int hctx_ctx_map_open(struct inode *inode, struct file *file)
319 return single_open(file, hctx_ctx_map_show, inode->i_private);
322 static const struct file_operations hctx_ctx_map_fops = {
323 .open = hctx_ctx_map_open,
326 .release = single_release,
329 static void blk_mq_debugfs_tags_show(struct seq_file *m,
330 struct blk_mq_tags *tags)
332 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
333 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
334 seq_printf(m, "active_queues=%d\n",
335 atomic_read(&tags->active_queues));
337 seq_puts(m, "\nbitmap_tags:\n");
338 sbitmap_queue_show(&tags->bitmap_tags, m);
340 if (tags->nr_reserved_tags) {
341 seq_puts(m, "\nbreserved_tags:\n");
342 sbitmap_queue_show(&tags->breserved_tags, m);
346 static int hctx_tags_show(struct seq_file *m, void *v)
348 struct blk_mq_hw_ctx *hctx = m->private;
349 struct request_queue *q = hctx->queue;
352 res = mutex_lock_interruptible(&q->sysfs_lock);
356 blk_mq_debugfs_tags_show(m, hctx->tags);
357 mutex_unlock(&q->sysfs_lock);
363 static int hctx_tags_open(struct inode *inode, struct file *file)
365 return single_open(file, hctx_tags_show, inode->i_private);
368 static const struct file_operations hctx_tags_fops = {
369 .open = hctx_tags_open,
372 .release = single_release,
375 static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
377 struct blk_mq_hw_ctx *hctx = m->private;
378 struct request_queue *q = hctx->queue;
381 res = mutex_lock_interruptible(&q->sysfs_lock);
385 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
386 mutex_unlock(&q->sysfs_lock);
392 static int hctx_tags_bitmap_open(struct inode *inode, struct file *file)
394 return single_open(file, hctx_tags_bitmap_show, inode->i_private);
397 static const struct file_operations hctx_tags_bitmap_fops = {
398 .open = hctx_tags_bitmap_open,
401 .release = single_release,
404 static int hctx_sched_tags_show(struct seq_file *m, void *v)
406 struct blk_mq_hw_ctx *hctx = m->private;
407 struct request_queue *q = hctx->queue;
410 res = mutex_lock_interruptible(&q->sysfs_lock);
413 if (hctx->sched_tags)
414 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
415 mutex_unlock(&q->sysfs_lock);
421 static int hctx_sched_tags_open(struct inode *inode, struct file *file)
423 return single_open(file, hctx_sched_tags_show, inode->i_private);
426 static const struct file_operations hctx_sched_tags_fops = {
427 .open = hctx_sched_tags_open,
430 .release = single_release,
433 static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
435 struct blk_mq_hw_ctx *hctx = m->private;
436 struct request_queue *q = hctx->queue;
439 res = mutex_lock_interruptible(&q->sysfs_lock);
442 if (hctx->sched_tags)
443 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
444 mutex_unlock(&q->sysfs_lock);
450 static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file)
452 return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private);
455 static const struct file_operations hctx_sched_tags_bitmap_fops = {
456 .open = hctx_sched_tags_bitmap_open,
459 .release = single_release,
462 static int hctx_io_poll_show(struct seq_file *m, void *v)
464 struct blk_mq_hw_ctx *hctx = m->private;
466 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
467 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
468 seq_printf(m, "success=%lu\n", hctx->poll_success);
472 static int hctx_io_poll_open(struct inode *inode, struct file *file)
474 return single_open(file, hctx_io_poll_show, inode->i_private);
477 static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf,
478 size_t count, loff_t *ppos)
480 struct seq_file *m = file->private_data;
481 struct blk_mq_hw_ctx *hctx = m->private;
483 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
487 static const struct file_operations hctx_io_poll_fops = {
488 .open = hctx_io_poll_open,
490 .write = hctx_io_poll_write,
492 .release = single_release,
495 static int hctx_dispatched_show(struct seq_file *m, void *v)
497 struct blk_mq_hw_ctx *hctx = m->private;
500 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
502 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
503 unsigned int d = 1U << (i - 1);
505 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
508 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
512 static int hctx_dispatched_open(struct inode *inode, struct file *file)
514 return single_open(file, hctx_dispatched_show, inode->i_private);
517 static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf,
518 size_t count, loff_t *ppos)
520 struct seq_file *m = file->private_data;
521 struct blk_mq_hw_ctx *hctx = m->private;
524 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
525 hctx->dispatched[i] = 0;
529 static const struct file_operations hctx_dispatched_fops = {
530 .open = hctx_dispatched_open,
532 .write = hctx_dispatched_write,
534 .release = single_release,
537 static int hctx_queued_show(struct seq_file *m, void *v)
539 struct blk_mq_hw_ctx *hctx = m->private;
541 seq_printf(m, "%lu\n", hctx->queued);
545 static int hctx_queued_open(struct inode *inode, struct file *file)
547 return single_open(file, hctx_queued_show, inode->i_private);
550 static ssize_t hctx_queued_write(struct file *file, const char __user *buf,
551 size_t count, loff_t *ppos)
553 struct seq_file *m = file->private_data;
554 struct blk_mq_hw_ctx *hctx = m->private;
560 static const struct file_operations hctx_queued_fops = {
561 .open = hctx_queued_open,
563 .write = hctx_queued_write,
565 .release = single_release,
568 static int hctx_run_show(struct seq_file *m, void *v)
570 struct blk_mq_hw_ctx *hctx = m->private;
572 seq_printf(m, "%lu\n", hctx->run);
576 static int hctx_run_open(struct inode *inode, struct file *file)
578 return single_open(file, hctx_run_show, inode->i_private);
581 static ssize_t hctx_run_write(struct file *file, const char __user *buf,
582 size_t count, loff_t *ppos)
584 struct seq_file *m = file->private_data;
585 struct blk_mq_hw_ctx *hctx = m->private;
591 static const struct file_operations hctx_run_fops = {
592 .open = hctx_run_open,
594 .write = hctx_run_write,
596 .release = single_release,
599 static int hctx_active_show(struct seq_file *m, void *v)
601 struct blk_mq_hw_ctx *hctx = m->private;
603 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
607 static int hctx_active_open(struct inode *inode, struct file *file)
609 return single_open(file, hctx_active_show, inode->i_private);
612 static const struct file_operations hctx_active_fops = {
613 .open = hctx_active_open,
616 .release = single_release,
619 static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
620 __acquires(&ctx->lock)
622 struct blk_mq_ctx *ctx = m->private;
624 spin_lock(&ctx->lock);
625 return seq_list_start(&ctx->rq_list, *pos);
628 static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
630 struct blk_mq_ctx *ctx = m->private;
632 return seq_list_next(v, &ctx->rq_list, pos);
635 static void ctx_rq_list_stop(struct seq_file *m, void *v)
636 __releases(&ctx->lock)
638 struct blk_mq_ctx *ctx = m->private;
640 spin_unlock(&ctx->lock);
643 static const struct seq_operations ctx_rq_list_seq_ops = {
644 .start = ctx_rq_list_start,
645 .next = ctx_rq_list_next,
646 .stop = ctx_rq_list_stop,
647 .show = blk_mq_debugfs_rq_show,
650 static int ctx_rq_list_open(struct inode *inode, struct file *file)
652 return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops);
655 static const struct file_operations ctx_rq_list_fops = {
656 .open = ctx_rq_list_open,
659 .release = seq_release,
662 static int ctx_dispatched_show(struct seq_file *m, void *v)
664 struct blk_mq_ctx *ctx = m->private;
666 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
670 static int ctx_dispatched_open(struct inode *inode, struct file *file)
672 return single_open(file, ctx_dispatched_show, inode->i_private);
675 static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf,
676 size_t count, loff_t *ppos)
678 struct seq_file *m = file->private_data;
679 struct blk_mq_ctx *ctx = m->private;
681 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
685 static const struct file_operations ctx_dispatched_fops = {
686 .open = ctx_dispatched_open,
688 .write = ctx_dispatched_write,
690 .release = single_release,
693 static int ctx_merged_show(struct seq_file *m, void *v)
695 struct blk_mq_ctx *ctx = m->private;
697 seq_printf(m, "%lu\n", ctx->rq_merged);
701 static int ctx_merged_open(struct inode *inode, struct file *file)
703 return single_open(file, ctx_merged_show, inode->i_private);
706 static ssize_t ctx_merged_write(struct file *file, const char __user *buf,
707 size_t count, loff_t *ppos)
709 struct seq_file *m = file->private_data;
710 struct blk_mq_ctx *ctx = m->private;
716 static const struct file_operations ctx_merged_fops = {
717 .open = ctx_merged_open,
719 .write = ctx_merged_write,
721 .release = single_release,
724 static int ctx_completed_show(struct seq_file *m, void *v)
726 struct blk_mq_ctx *ctx = m->private;
728 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
732 static int ctx_completed_open(struct inode *inode, struct file *file)
734 return single_open(file, ctx_completed_show, inode->i_private);
737 static ssize_t ctx_completed_write(struct file *file, const char __user *buf,
738 size_t count, loff_t *ppos)
740 struct seq_file *m = file->private_data;
741 struct blk_mq_ctx *ctx = m->private;
743 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
747 static const struct file_operations ctx_completed_fops = {
748 .open = ctx_completed_open,
750 .write = ctx_completed_write,
752 .release = single_release,
755 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
756 {"poll_stat", 0400, &queue_poll_stat_fops},
757 {"state", 0600, &blk_queue_flags_fops},
761 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
762 {"state", 0400, &hctx_state_fops},
763 {"flags", 0400, &hctx_flags_fops},
764 {"dispatch", 0400, &hctx_dispatch_fops},
765 {"ctx_map", 0400, &hctx_ctx_map_fops},
766 {"tags", 0400, &hctx_tags_fops},
767 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops},
768 {"sched_tags", 0400, &hctx_sched_tags_fops},
769 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops},
770 {"io_poll", 0600, &hctx_io_poll_fops},
771 {"dispatched", 0600, &hctx_dispatched_fops},
772 {"queued", 0600, &hctx_queued_fops},
773 {"run", 0600, &hctx_run_fops},
774 {"active", 0400, &hctx_active_fops},
778 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
779 {"rq_list", 0400, &ctx_rq_list_fops},
780 {"dispatched", 0600, &ctx_dispatched_fops},
781 {"merged", 0600, &ctx_merged_fops},
782 {"completed", 0600, &ctx_completed_fops},
786 int blk_mq_debugfs_register(struct request_queue *q)
788 if (!blk_debugfs_root)
791 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
796 if (blk_mq_debugfs_register_mq(q))
802 blk_mq_debugfs_unregister(q);
806 void blk_mq_debugfs_unregister(struct request_queue *q)
808 debugfs_remove_recursive(q->debugfs_dir);
809 q->mq_debugfs_dir = NULL;
810 q->debugfs_dir = NULL;
813 static bool debugfs_create_files(struct dentry *parent, void *data,
814 const struct blk_mq_debugfs_attr *attr)
816 for (; attr->name; attr++) {
817 if (!debugfs_create_file(attr->name, attr->mode, parent,
824 static int blk_mq_debugfs_register_ctx(struct request_queue *q,
825 struct blk_mq_ctx *ctx,
826 struct dentry *hctx_dir)
828 struct dentry *ctx_dir;
831 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
832 ctx_dir = debugfs_create_dir(name, hctx_dir);
836 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
842 static int blk_mq_debugfs_register_hctx(struct request_queue *q,
843 struct blk_mq_hw_ctx *hctx)
845 struct blk_mq_ctx *ctx;
846 struct dentry *hctx_dir;
850 snprintf(name, sizeof(name), "%u", hctx->queue_num);
851 hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir);
855 if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs))
858 hctx_for_each_ctx(hctx, ctx, i) {
859 if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir))
866 int blk_mq_debugfs_register_mq(struct request_queue *q)
868 struct blk_mq_hw_ctx *hctx;
874 q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir);
875 if (!q->mq_debugfs_dir)
878 if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs))
881 queue_for_each_hw_ctx(q, hctx, i) {
882 if (blk_mq_debugfs_register_hctx(q, hctx))
889 blk_mq_debugfs_unregister_mq(q);
893 void blk_mq_debugfs_unregister_mq(struct request_queue *q)
895 debugfs_remove_recursive(q->mq_debugfs_dir);
896 q->mq_debugfs_dir = NULL;