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);
67 static const char *const blk_queue_flag_name[] = {
68 [QUEUE_FLAG_QUEUED] = "QUEUED",
69 [QUEUE_FLAG_STOPPED] = "STOPPED",
70 [QUEUE_FLAG_SYNCFULL] = "SYNCFULL",
71 [QUEUE_FLAG_ASYNCFULL] = "ASYNCFULL",
72 [QUEUE_FLAG_DYING] = "DYING",
73 [QUEUE_FLAG_BYPASS] = "BYPASS",
74 [QUEUE_FLAG_BIDI] = "BIDI",
75 [QUEUE_FLAG_NOMERGES] = "NOMERGES",
76 [QUEUE_FLAG_SAME_COMP] = "SAME_COMP",
77 [QUEUE_FLAG_FAIL_IO] = "FAIL_IO",
78 [QUEUE_FLAG_STACKABLE] = "STACKABLE",
79 [QUEUE_FLAG_NONROT] = "NONROT",
80 [QUEUE_FLAG_IO_STAT] = "IO_STAT",
81 [QUEUE_FLAG_DISCARD] = "DISCARD",
82 [QUEUE_FLAG_NOXMERGES] = "NOXMERGES",
83 [QUEUE_FLAG_ADD_RANDOM] = "ADD_RANDOM",
84 [QUEUE_FLAG_SECERASE] = "SECERASE",
85 [QUEUE_FLAG_SAME_FORCE] = "SAME_FORCE",
86 [QUEUE_FLAG_DEAD] = "DEAD",
87 [QUEUE_FLAG_INIT_DONE] = "INIT_DONE",
88 [QUEUE_FLAG_NO_SG_MERGE] = "NO_SG_MERGE",
89 [QUEUE_FLAG_POLL] = "POLL",
90 [QUEUE_FLAG_WC] = "WC",
91 [QUEUE_FLAG_FUA] = "FUA",
92 [QUEUE_FLAG_FLUSH_NQ] = "FLUSH_NQ",
93 [QUEUE_FLAG_DAX] = "DAX",
94 [QUEUE_FLAG_STATS] = "STATS",
95 [QUEUE_FLAG_POLL_STATS] = "POLL_STATS",
96 [QUEUE_FLAG_REGISTERED] = "REGISTERED",
99 static int blk_queue_flags_show(struct seq_file *m, void *v)
101 struct request_queue *q = m->private;
103 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
104 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 const struct blk_mq_debugfs_attr blk_queue_attrs[] = {
145 {"state", 0600, &blk_queue_flags_fops},
149 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
151 if (stat->nr_samples) {
152 seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
153 stat->nr_samples, stat->mean, stat->min, stat->max);
155 seq_puts(m, "samples=0");
159 static int queue_poll_stat_show(struct seq_file *m, void *v)
161 struct request_queue *q = m->private;
164 for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
165 seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket));
166 print_stat(m, &q->poll_stat[2*bucket]);
169 seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket));
170 print_stat(m, &q->poll_stat[2*bucket+1]);
176 static int queue_poll_stat_open(struct inode *inode, struct file *file)
178 return single_open(file, queue_poll_stat_show, inode->i_private);
181 static const struct file_operations queue_poll_stat_fops = {
182 .open = queue_poll_stat_open,
185 .release = single_release,
188 static const char *const hctx_state_name[] = {
189 [BLK_MQ_S_STOPPED] = "STOPPED",
190 [BLK_MQ_S_TAG_ACTIVE] = "TAG_ACTIVE",
191 [BLK_MQ_S_SCHED_RESTART] = "SCHED_RESTART",
192 [BLK_MQ_S_TAG_WAITING] = "TAG_WAITING",
195 static int hctx_state_show(struct seq_file *m, void *v)
197 struct blk_mq_hw_ctx *hctx = m->private;
199 blk_flags_show(m, hctx->state, hctx_state_name,
200 ARRAY_SIZE(hctx_state_name));
204 static int hctx_state_open(struct inode *inode, struct file *file)
206 return single_open(file, hctx_state_show, inode->i_private);
209 static const struct file_operations hctx_state_fops = {
210 .open = hctx_state_open,
213 .release = single_release,
216 static const char *const alloc_policy_name[] = {
217 [BLK_TAG_ALLOC_FIFO] = "fifo",
218 [BLK_TAG_ALLOC_RR] = "rr",
221 static const char *const hctx_flag_name[] = {
222 [ilog2(BLK_MQ_F_SHOULD_MERGE)] = "SHOULD_MERGE",
223 [ilog2(BLK_MQ_F_TAG_SHARED)] = "TAG_SHARED",
224 [ilog2(BLK_MQ_F_SG_MERGE)] = "SG_MERGE",
225 [ilog2(BLK_MQ_F_BLOCKING)] = "BLOCKING",
226 [ilog2(BLK_MQ_F_NO_SCHED)] = "NO_SCHED",
229 static int hctx_flags_show(struct seq_file *m, void *v)
231 struct blk_mq_hw_ctx *hctx = m->private;
232 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
234 seq_puts(m, "alloc_policy=");
235 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
236 alloc_policy_name[alloc_policy])
237 seq_puts(m, alloc_policy_name[alloc_policy]);
239 seq_printf(m, "%d", alloc_policy);
242 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
243 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
247 static int hctx_flags_open(struct inode *inode, struct file *file)
249 return single_open(file, hctx_flags_show, inode->i_private);
252 static const struct file_operations hctx_flags_fops = {
253 .open = hctx_flags_open,
256 .release = single_release,
259 static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
261 struct request *rq = list_entry_rq(v);
263 seq_printf(m, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n",
264 rq, rq->cmd_flags, (__force unsigned int)rq->rq_flags,
265 rq->tag, rq->internal_tag);
269 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
270 __acquires(&hctx->lock)
272 struct blk_mq_hw_ctx *hctx = m->private;
274 spin_lock(&hctx->lock);
275 return seq_list_start(&hctx->dispatch, *pos);
278 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
280 struct blk_mq_hw_ctx *hctx = m->private;
282 return seq_list_next(v, &hctx->dispatch, pos);
285 static void hctx_dispatch_stop(struct seq_file *m, void *v)
286 __releases(&hctx->lock)
288 struct blk_mq_hw_ctx *hctx = m->private;
290 spin_unlock(&hctx->lock);
293 static const struct seq_operations hctx_dispatch_seq_ops = {
294 .start = hctx_dispatch_start,
295 .next = hctx_dispatch_next,
296 .stop = hctx_dispatch_stop,
297 .show = blk_mq_debugfs_rq_show,
300 static int hctx_dispatch_open(struct inode *inode, struct file *file)
302 return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops);
305 static const struct file_operations hctx_dispatch_fops = {
306 .open = hctx_dispatch_open,
309 .release = seq_release,
312 static int hctx_ctx_map_show(struct seq_file *m, void *v)
314 struct blk_mq_hw_ctx *hctx = m->private;
316 sbitmap_bitmap_show(&hctx->ctx_map, m);
320 static int hctx_ctx_map_open(struct inode *inode, struct file *file)
322 return single_open(file, hctx_ctx_map_show, inode->i_private);
325 static const struct file_operations hctx_ctx_map_fops = {
326 .open = hctx_ctx_map_open,
329 .release = single_release,
332 static void blk_mq_debugfs_tags_show(struct seq_file *m,
333 struct blk_mq_tags *tags)
335 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
336 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
337 seq_printf(m, "active_queues=%d\n",
338 atomic_read(&tags->active_queues));
340 seq_puts(m, "\nbitmap_tags:\n");
341 sbitmap_queue_show(&tags->bitmap_tags, m);
343 if (tags->nr_reserved_tags) {
344 seq_puts(m, "\nbreserved_tags:\n");
345 sbitmap_queue_show(&tags->breserved_tags, m);
349 static int hctx_tags_show(struct seq_file *m, void *v)
351 struct blk_mq_hw_ctx *hctx = m->private;
352 struct request_queue *q = hctx->queue;
355 res = mutex_lock_interruptible(&q->sysfs_lock);
359 blk_mq_debugfs_tags_show(m, hctx->tags);
360 mutex_unlock(&q->sysfs_lock);
366 static int hctx_tags_open(struct inode *inode, struct file *file)
368 return single_open(file, hctx_tags_show, inode->i_private);
371 static const struct file_operations hctx_tags_fops = {
372 .open = hctx_tags_open,
375 .release = single_release,
378 static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
380 struct blk_mq_hw_ctx *hctx = m->private;
381 struct request_queue *q = hctx->queue;
384 res = mutex_lock_interruptible(&q->sysfs_lock);
388 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
389 mutex_unlock(&q->sysfs_lock);
395 static int hctx_tags_bitmap_open(struct inode *inode, struct file *file)
397 return single_open(file, hctx_tags_bitmap_show, inode->i_private);
400 static const struct file_operations hctx_tags_bitmap_fops = {
401 .open = hctx_tags_bitmap_open,
404 .release = single_release,
407 static int hctx_sched_tags_show(struct seq_file *m, void *v)
409 struct blk_mq_hw_ctx *hctx = m->private;
410 struct request_queue *q = hctx->queue;
413 res = mutex_lock_interruptible(&q->sysfs_lock);
416 if (hctx->sched_tags)
417 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
418 mutex_unlock(&q->sysfs_lock);
424 static int hctx_sched_tags_open(struct inode *inode, struct file *file)
426 return single_open(file, hctx_sched_tags_show, inode->i_private);
429 static const struct file_operations hctx_sched_tags_fops = {
430 .open = hctx_sched_tags_open,
433 .release = single_release,
436 static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
438 struct blk_mq_hw_ctx *hctx = m->private;
439 struct request_queue *q = hctx->queue;
442 res = mutex_lock_interruptible(&q->sysfs_lock);
445 if (hctx->sched_tags)
446 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
447 mutex_unlock(&q->sysfs_lock);
453 static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file)
455 return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private);
458 static const struct file_operations hctx_sched_tags_bitmap_fops = {
459 .open = hctx_sched_tags_bitmap_open,
462 .release = single_release,
465 static int hctx_io_poll_show(struct seq_file *m, void *v)
467 struct blk_mq_hw_ctx *hctx = m->private;
469 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
470 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
471 seq_printf(m, "success=%lu\n", hctx->poll_success);
475 static int hctx_io_poll_open(struct inode *inode, struct file *file)
477 return single_open(file, hctx_io_poll_show, inode->i_private);
480 static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf,
481 size_t count, loff_t *ppos)
483 struct seq_file *m = file->private_data;
484 struct blk_mq_hw_ctx *hctx = m->private;
486 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
490 static const struct file_operations hctx_io_poll_fops = {
491 .open = hctx_io_poll_open,
493 .write = hctx_io_poll_write,
495 .release = single_release,
498 static int hctx_dispatched_show(struct seq_file *m, void *v)
500 struct blk_mq_hw_ctx *hctx = m->private;
503 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
505 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
506 unsigned int d = 1U << (i - 1);
508 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
511 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
515 static int hctx_dispatched_open(struct inode *inode, struct file *file)
517 return single_open(file, hctx_dispatched_show, inode->i_private);
520 static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf,
521 size_t count, loff_t *ppos)
523 struct seq_file *m = file->private_data;
524 struct blk_mq_hw_ctx *hctx = m->private;
527 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
528 hctx->dispatched[i] = 0;
532 static const struct file_operations hctx_dispatched_fops = {
533 .open = hctx_dispatched_open,
535 .write = hctx_dispatched_write,
537 .release = single_release,
540 static int hctx_queued_show(struct seq_file *m, void *v)
542 struct blk_mq_hw_ctx *hctx = m->private;
544 seq_printf(m, "%lu\n", hctx->queued);
548 static int hctx_queued_open(struct inode *inode, struct file *file)
550 return single_open(file, hctx_queued_show, inode->i_private);
553 static ssize_t hctx_queued_write(struct file *file, const char __user *buf,
554 size_t count, loff_t *ppos)
556 struct seq_file *m = file->private_data;
557 struct blk_mq_hw_ctx *hctx = m->private;
563 static const struct file_operations hctx_queued_fops = {
564 .open = hctx_queued_open,
566 .write = hctx_queued_write,
568 .release = single_release,
571 static int hctx_run_show(struct seq_file *m, void *v)
573 struct blk_mq_hw_ctx *hctx = m->private;
575 seq_printf(m, "%lu\n", hctx->run);
579 static int hctx_run_open(struct inode *inode, struct file *file)
581 return single_open(file, hctx_run_show, inode->i_private);
584 static ssize_t hctx_run_write(struct file *file, const char __user *buf,
585 size_t count, loff_t *ppos)
587 struct seq_file *m = file->private_data;
588 struct blk_mq_hw_ctx *hctx = m->private;
594 static const struct file_operations hctx_run_fops = {
595 .open = hctx_run_open,
597 .write = hctx_run_write,
599 .release = single_release,
602 static int hctx_active_show(struct seq_file *m, void *v)
604 struct blk_mq_hw_ctx *hctx = m->private;
606 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
610 static int hctx_active_open(struct inode *inode, struct file *file)
612 return single_open(file, hctx_active_show, inode->i_private);
615 static const struct file_operations hctx_active_fops = {
616 .open = hctx_active_open,
619 .release = single_release,
622 static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
623 __acquires(&ctx->lock)
625 struct blk_mq_ctx *ctx = m->private;
627 spin_lock(&ctx->lock);
628 return seq_list_start(&ctx->rq_list, *pos);
631 static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
633 struct blk_mq_ctx *ctx = m->private;
635 return seq_list_next(v, &ctx->rq_list, pos);
638 static void ctx_rq_list_stop(struct seq_file *m, void *v)
639 __releases(&ctx->lock)
641 struct blk_mq_ctx *ctx = m->private;
643 spin_unlock(&ctx->lock);
646 static const struct seq_operations ctx_rq_list_seq_ops = {
647 .start = ctx_rq_list_start,
648 .next = ctx_rq_list_next,
649 .stop = ctx_rq_list_stop,
650 .show = blk_mq_debugfs_rq_show,
653 static int ctx_rq_list_open(struct inode *inode, struct file *file)
655 return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops);
658 static const struct file_operations ctx_rq_list_fops = {
659 .open = ctx_rq_list_open,
662 .release = seq_release,
665 static int ctx_dispatched_show(struct seq_file *m, void *v)
667 struct blk_mq_ctx *ctx = m->private;
669 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
673 static int ctx_dispatched_open(struct inode *inode, struct file *file)
675 return single_open(file, ctx_dispatched_show, inode->i_private);
678 static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf,
679 size_t count, loff_t *ppos)
681 struct seq_file *m = file->private_data;
682 struct blk_mq_ctx *ctx = m->private;
684 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
688 static const struct file_operations ctx_dispatched_fops = {
689 .open = ctx_dispatched_open,
691 .write = ctx_dispatched_write,
693 .release = single_release,
696 static int ctx_merged_show(struct seq_file *m, void *v)
698 struct blk_mq_ctx *ctx = m->private;
700 seq_printf(m, "%lu\n", ctx->rq_merged);
704 static int ctx_merged_open(struct inode *inode, struct file *file)
706 return single_open(file, ctx_merged_show, inode->i_private);
709 static ssize_t ctx_merged_write(struct file *file, const char __user *buf,
710 size_t count, loff_t *ppos)
712 struct seq_file *m = file->private_data;
713 struct blk_mq_ctx *ctx = m->private;
719 static const struct file_operations ctx_merged_fops = {
720 .open = ctx_merged_open,
722 .write = ctx_merged_write,
724 .release = single_release,
727 static int ctx_completed_show(struct seq_file *m, void *v)
729 struct blk_mq_ctx *ctx = m->private;
731 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
735 static int ctx_completed_open(struct inode *inode, struct file *file)
737 return single_open(file, ctx_completed_show, inode->i_private);
740 static ssize_t ctx_completed_write(struct file *file, const char __user *buf,
741 size_t count, loff_t *ppos)
743 struct seq_file *m = file->private_data;
744 struct blk_mq_ctx *ctx = m->private;
746 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
750 static const struct file_operations ctx_completed_fops = {
751 .open = ctx_completed_open,
753 .write = ctx_completed_write,
755 .release = single_release,
758 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
759 {"poll_stat", 0400, &queue_poll_stat_fops},
763 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
764 {"state", 0400, &hctx_state_fops},
765 {"flags", 0400, &hctx_flags_fops},
766 {"dispatch", 0400, &hctx_dispatch_fops},
767 {"ctx_map", 0400, &hctx_ctx_map_fops},
768 {"tags", 0400, &hctx_tags_fops},
769 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops},
770 {"sched_tags", 0400, &hctx_sched_tags_fops},
771 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops},
772 {"io_poll", 0600, &hctx_io_poll_fops},
773 {"dispatched", 0600, &hctx_dispatched_fops},
774 {"queued", 0600, &hctx_queued_fops},
775 {"run", 0600, &hctx_run_fops},
776 {"active", 0400, &hctx_active_fops},
780 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
781 {"rq_list", 0400, &ctx_rq_list_fops},
782 {"dispatched", 0600, &ctx_dispatched_fops},
783 {"merged", 0600, &ctx_merged_fops},
784 {"completed", 0600, &ctx_completed_fops},
788 int blk_mq_debugfs_register(struct request_queue *q, const char *name)
790 if (!blk_debugfs_root)
793 q->debugfs_dir = debugfs_create_dir(name, blk_debugfs_root);
797 if (blk_mq_debugfs_register_hctxs(q))
803 blk_mq_debugfs_unregister(q);
807 void blk_mq_debugfs_unregister(struct request_queue *q)
809 debugfs_remove_recursive(q->debugfs_dir);
810 q->mq_debugfs_dir = NULL;
811 q->debugfs_dir = NULL;
814 static bool debugfs_create_files(struct dentry *parent, void *data,
815 const struct blk_mq_debugfs_attr *attr)
817 for (; attr->name; attr++) {
818 if (!debugfs_create_file(attr->name, attr->mode, parent,
825 static int blk_mq_debugfs_register_ctx(struct request_queue *q,
826 struct blk_mq_ctx *ctx,
827 struct dentry *hctx_dir)
829 struct dentry *ctx_dir;
832 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
833 ctx_dir = debugfs_create_dir(name, hctx_dir);
837 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
843 static int blk_mq_debugfs_register_hctx(struct request_queue *q,
844 struct blk_mq_hw_ctx *hctx)
846 struct blk_mq_ctx *ctx;
847 struct dentry *hctx_dir;
851 snprintf(name, sizeof(name), "%u", hctx->queue_num);
852 hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir);
856 if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs))
859 hctx_for_each_ctx(hctx, ctx, i) {
860 if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir))
867 int blk_mq_debugfs_register_hctxs(struct request_queue *q)
869 struct blk_mq_hw_ctx *hctx;
875 if (!debugfs_create_files(q->debugfs_dir, q, blk_queue_attrs))
878 q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir);
879 if (!q->mq_debugfs_dir)
882 if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs))
885 queue_for_each_hw_ctx(q, hctx, i) {
886 if (blk_mq_debugfs_register_hctx(q, hctx))
893 blk_mq_debugfs_unregister_hctxs(q);
897 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
899 debugfs_remove_recursive(q->mq_debugfs_dir);
900 q->mq_debugfs_dir = NULL;