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-debugfs.h"
25 #include "blk-mq-tag.h"
26 #include "blk-rq-qos.h"
28 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
30 if (stat->nr_samples) {
31 seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
32 stat->nr_samples, stat->mean, stat->min, stat->max);
34 seq_puts(m, "samples=0");
38 static int queue_poll_stat_show(void *data, struct seq_file *m)
40 struct request_queue *q = data;
43 for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
44 seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket));
45 print_stat(m, &q->poll_stat[2*bucket]);
48 seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket));
49 print_stat(m, &q->poll_stat[2*bucket+1]);
55 static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
56 __acquires(&q->requeue_lock)
58 struct request_queue *q = m->private;
60 spin_lock_irq(&q->requeue_lock);
61 return seq_list_start(&q->requeue_list, *pos);
64 static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
66 struct request_queue *q = m->private;
68 return seq_list_next(v, &q->requeue_list, pos);
71 static void queue_requeue_list_stop(struct seq_file *m, void *v)
72 __releases(&q->requeue_lock)
74 struct request_queue *q = m->private;
76 spin_unlock_irq(&q->requeue_lock);
79 static const struct seq_operations queue_requeue_list_seq_ops = {
80 .start = queue_requeue_list_start,
81 .next = queue_requeue_list_next,
82 .stop = queue_requeue_list_stop,
83 .show = blk_mq_debugfs_rq_show,
86 static int blk_flags_show(struct seq_file *m, const unsigned long flags,
87 const char *const *flag_name, int flag_name_count)
92 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
93 if (!(flags & BIT(i)))
98 if (i < flag_name_count && flag_name[i])
99 seq_puts(m, flag_name[i]);
101 seq_printf(m, "%d", i);
106 static int queue_pm_only_show(void *data, struct seq_file *m)
108 struct request_queue *q = data;
110 seq_printf(m, "%d\n", atomic_read(&q->pm_only));
114 #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
115 static const char *const blk_queue_flag_name[] = {
116 QUEUE_FLAG_NAME(STOPPED),
117 QUEUE_FLAG_NAME(DYING),
118 QUEUE_FLAG_NAME(BIDI),
119 QUEUE_FLAG_NAME(NOMERGES),
120 QUEUE_FLAG_NAME(SAME_COMP),
121 QUEUE_FLAG_NAME(FAIL_IO),
122 QUEUE_FLAG_NAME(NONROT),
123 QUEUE_FLAG_NAME(IO_STAT),
124 QUEUE_FLAG_NAME(DISCARD),
125 QUEUE_FLAG_NAME(NOXMERGES),
126 QUEUE_FLAG_NAME(ADD_RANDOM),
127 QUEUE_FLAG_NAME(SECERASE),
128 QUEUE_FLAG_NAME(SAME_FORCE),
129 QUEUE_FLAG_NAME(DEAD),
130 QUEUE_FLAG_NAME(INIT_DONE),
131 QUEUE_FLAG_NAME(NO_SG_MERGE),
132 QUEUE_FLAG_NAME(POLL),
134 QUEUE_FLAG_NAME(FUA),
135 QUEUE_FLAG_NAME(FLUSH_NQ),
136 QUEUE_FLAG_NAME(DAX),
137 QUEUE_FLAG_NAME(STATS),
138 QUEUE_FLAG_NAME(POLL_STATS),
139 QUEUE_FLAG_NAME(REGISTERED),
140 QUEUE_FLAG_NAME(SCSI_PASSTHROUGH),
141 QUEUE_FLAG_NAME(QUIESCED),
143 #undef QUEUE_FLAG_NAME
145 static int queue_state_show(void *data, struct seq_file *m)
147 struct request_queue *q = data;
149 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
150 ARRAY_SIZE(blk_queue_flag_name));
155 static ssize_t queue_state_write(void *data, const char __user *buf,
156 size_t count, loff_t *ppos)
158 struct request_queue *q = data;
159 char opbuf[16] = { }, *op;
162 * The "state" attribute is removed after blk_cleanup_queue() has called
163 * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
164 * triggering a use-after-free.
166 if (blk_queue_dead(q))
169 if (count >= sizeof(opbuf)) {
170 pr_err("%s: operation too long\n", __func__);
174 if (copy_from_user(opbuf, buf, count))
176 op = strstrip(opbuf);
177 if (strcmp(op, "run") == 0) {
178 blk_mq_run_hw_queues(q, true);
179 } else if (strcmp(op, "start") == 0) {
180 blk_mq_start_stopped_hw_queues(q, true);
181 } else if (strcmp(op, "kick") == 0) {
182 blk_mq_kick_requeue_list(q);
184 pr_err("%s: unsupported operation '%s'\n", __func__, op);
186 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
192 static int queue_write_hint_show(void *data, struct seq_file *m)
194 struct request_queue *q = data;
197 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
198 seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
203 static ssize_t queue_write_hint_store(void *data, const char __user *buf,
204 size_t count, loff_t *ppos)
206 struct request_queue *q = data;
209 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
210 q->write_hints[i] = 0;
215 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
216 { "poll_stat", 0400, queue_poll_stat_show },
217 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
218 { "pm_only", 0600, queue_pm_only_show, NULL },
219 { "state", 0600, queue_state_show, queue_state_write },
220 { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
221 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
225 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
226 static const char *const hctx_state_name[] = {
227 HCTX_STATE_NAME(STOPPED),
228 HCTX_STATE_NAME(TAG_ACTIVE),
229 HCTX_STATE_NAME(SCHED_RESTART),
231 #undef HCTX_STATE_NAME
233 static int hctx_state_show(void *data, struct seq_file *m)
235 struct blk_mq_hw_ctx *hctx = data;
237 blk_flags_show(m, hctx->state, hctx_state_name,
238 ARRAY_SIZE(hctx_state_name));
243 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
244 static const char *const alloc_policy_name[] = {
245 BLK_TAG_ALLOC_NAME(FIFO),
246 BLK_TAG_ALLOC_NAME(RR),
248 #undef BLK_TAG_ALLOC_NAME
250 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
251 static const char *const hctx_flag_name[] = {
252 HCTX_FLAG_NAME(SHOULD_MERGE),
253 HCTX_FLAG_NAME(TAG_SHARED),
254 HCTX_FLAG_NAME(SG_MERGE),
255 HCTX_FLAG_NAME(BLOCKING),
256 HCTX_FLAG_NAME(NO_SCHED),
258 #undef HCTX_FLAG_NAME
260 static int hctx_flags_show(void *data, struct seq_file *m)
262 struct blk_mq_hw_ctx *hctx = data;
263 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
265 seq_puts(m, "alloc_policy=");
266 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
267 alloc_policy_name[alloc_policy])
268 seq_puts(m, alloc_policy_name[alloc_policy]);
270 seq_printf(m, "%d", alloc_policy);
273 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
274 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
279 #define REQ_OP_NAME(name) [REQ_OP_##name] = #name
280 static const char *const op_name[] = {
284 REQ_OP_NAME(DISCARD),
285 REQ_OP_NAME(SECURE_ERASE),
286 REQ_OP_NAME(ZONE_RESET),
287 REQ_OP_NAME(WRITE_SAME),
288 REQ_OP_NAME(WRITE_ZEROES),
289 REQ_OP_NAME(SCSI_IN),
290 REQ_OP_NAME(SCSI_OUT),
292 REQ_OP_NAME(DRV_OUT),
296 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
297 static const char *const cmd_flag_name[] = {
298 CMD_FLAG_NAME(FAILFAST_DEV),
299 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
300 CMD_FLAG_NAME(FAILFAST_DRIVER),
304 CMD_FLAG_NAME(NOMERGE),
306 CMD_FLAG_NAME(INTEGRITY),
308 CMD_FLAG_NAME(PREFLUSH),
309 CMD_FLAG_NAME(RAHEAD),
310 CMD_FLAG_NAME(BACKGROUND),
311 CMD_FLAG_NAME(NOUNMAP),
312 CMD_FLAG_NAME(NOWAIT),
316 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
317 static const char *const rqf_name[] = {
320 RQF_NAME(SOFTBARRIER),
322 RQF_NAME(MIXED_MERGE),
323 RQF_NAME(MQ_INFLIGHT),
335 RQF_NAME(SPECIAL_PAYLOAD),
336 RQF_NAME(ZONE_WRITE_LOCKED),
337 RQF_NAME(MQ_POLL_SLEPT),
341 static const char *const blk_mq_rq_state_name_array[] = {
342 [MQ_RQ_IDLE] = "idle",
343 [MQ_RQ_IN_FLIGHT] = "in_flight",
344 [MQ_RQ_COMPLETE] = "complete",
347 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
349 if (WARN_ON_ONCE((unsigned int)rq_state >=
350 ARRAY_SIZE(blk_mq_rq_state_name_array)))
352 return blk_mq_rq_state_name_array[rq_state];
355 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
357 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
358 const unsigned int op = rq->cmd_flags & REQ_OP_MASK;
360 seq_printf(m, "%p {.op=", rq);
361 if (op < ARRAY_SIZE(op_name) && op_name[op])
362 seq_printf(m, "%s", op_name[op]);
364 seq_printf(m, "%d", op);
365 seq_puts(m, ", .cmd_flags=");
366 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
367 ARRAY_SIZE(cmd_flag_name));
368 seq_puts(m, ", .rq_flags=");
369 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
370 ARRAY_SIZE(rqf_name));
371 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
372 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
375 mq_ops->show_rq(m, rq);
379 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
381 int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
383 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
385 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
387 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
388 __acquires(&hctx->lock)
390 struct blk_mq_hw_ctx *hctx = m->private;
392 spin_lock(&hctx->lock);
393 return seq_list_start(&hctx->dispatch, *pos);
396 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
398 struct blk_mq_hw_ctx *hctx = m->private;
400 return seq_list_next(v, &hctx->dispatch, pos);
403 static void hctx_dispatch_stop(struct seq_file *m, void *v)
404 __releases(&hctx->lock)
406 struct blk_mq_hw_ctx *hctx = m->private;
408 spin_unlock(&hctx->lock);
411 static const struct seq_operations hctx_dispatch_seq_ops = {
412 .start = hctx_dispatch_start,
413 .next = hctx_dispatch_next,
414 .stop = hctx_dispatch_stop,
415 .show = blk_mq_debugfs_rq_show,
418 struct show_busy_params {
420 struct blk_mq_hw_ctx *hctx;
424 * Note: the state of a request may change while this function is in progress,
425 * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
426 * keep iterating requests.
428 static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
430 const struct show_busy_params *params = data;
432 if (rq->mq_hctx == params->hctx)
433 __blk_mq_debugfs_rq_show(params->m,
434 list_entry_rq(&rq->queuelist));
439 static int hctx_busy_show(void *data, struct seq_file *m)
441 struct blk_mq_hw_ctx *hctx = data;
442 struct show_busy_params params = { .m = m, .hctx = hctx };
444 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
450 static const char *const hctx_types[] = {
451 [HCTX_TYPE_DEFAULT] = "default",
452 [HCTX_TYPE_READ] = "read",
453 [HCTX_TYPE_POLL] = "poll",
456 static int hctx_type_show(void *data, struct seq_file *m)
458 struct blk_mq_hw_ctx *hctx = data;
460 BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
461 seq_printf(m, "%s\n", hctx_types[hctx->type]);
465 static int hctx_ctx_map_show(void *data, struct seq_file *m)
467 struct blk_mq_hw_ctx *hctx = data;
469 sbitmap_bitmap_show(&hctx->ctx_map, m);
473 static void blk_mq_debugfs_tags_show(struct seq_file *m,
474 struct blk_mq_tags *tags)
476 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
477 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
478 seq_printf(m, "active_queues=%d\n",
479 atomic_read(&tags->active_queues));
481 seq_puts(m, "\nbitmap_tags:\n");
482 sbitmap_queue_show(&tags->bitmap_tags, m);
484 if (tags->nr_reserved_tags) {
485 seq_puts(m, "\nbreserved_tags:\n");
486 sbitmap_queue_show(&tags->breserved_tags, m);
490 static int hctx_tags_show(void *data, struct seq_file *m)
492 struct blk_mq_hw_ctx *hctx = data;
493 struct request_queue *q = hctx->queue;
496 res = mutex_lock_interruptible(&q->sysfs_lock);
500 blk_mq_debugfs_tags_show(m, hctx->tags);
501 mutex_unlock(&q->sysfs_lock);
507 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
509 struct blk_mq_hw_ctx *hctx = data;
510 struct request_queue *q = hctx->queue;
513 res = mutex_lock_interruptible(&q->sysfs_lock);
517 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
518 mutex_unlock(&q->sysfs_lock);
524 static int hctx_sched_tags_show(void *data, struct seq_file *m)
526 struct blk_mq_hw_ctx *hctx = data;
527 struct request_queue *q = hctx->queue;
530 res = mutex_lock_interruptible(&q->sysfs_lock);
533 if (hctx->sched_tags)
534 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
535 mutex_unlock(&q->sysfs_lock);
541 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
543 struct blk_mq_hw_ctx *hctx = data;
544 struct request_queue *q = hctx->queue;
547 res = mutex_lock_interruptible(&q->sysfs_lock);
550 if (hctx->sched_tags)
551 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
552 mutex_unlock(&q->sysfs_lock);
558 static int hctx_io_poll_show(void *data, struct seq_file *m)
560 struct blk_mq_hw_ctx *hctx = data;
562 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
563 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
564 seq_printf(m, "success=%lu\n", hctx->poll_success);
568 static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
569 size_t count, loff_t *ppos)
571 struct blk_mq_hw_ctx *hctx = data;
573 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
577 static int hctx_dispatched_show(void *data, struct seq_file *m)
579 struct blk_mq_hw_ctx *hctx = data;
582 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
584 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
585 unsigned int d = 1U << (i - 1);
587 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
590 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
594 static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
595 size_t count, loff_t *ppos)
597 struct blk_mq_hw_ctx *hctx = data;
600 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
601 hctx->dispatched[i] = 0;
605 static int hctx_queued_show(void *data, struct seq_file *m)
607 struct blk_mq_hw_ctx *hctx = data;
609 seq_printf(m, "%lu\n", hctx->queued);
613 static ssize_t hctx_queued_write(void *data, const char __user *buf,
614 size_t count, loff_t *ppos)
616 struct blk_mq_hw_ctx *hctx = data;
622 static int hctx_run_show(void *data, struct seq_file *m)
624 struct blk_mq_hw_ctx *hctx = data;
626 seq_printf(m, "%lu\n", hctx->run);
630 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
633 struct blk_mq_hw_ctx *hctx = data;
639 static int hctx_active_show(void *data, struct seq_file *m)
641 struct blk_mq_hw_ctx *hctx = data;
643 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
647 static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
649 struct blk_mq_hw_ctx *hctx = data;
651 seq_printf(m, "%u\n", hctx->dispatch_busy);
655 #define CTX_RQ_SEQ_OPS(name, type) \
656 static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
657 __acquires(&ctx->lock) \
659 struct blk_mq_ctx *ctx = m->private; \
661 spin_lock(&ctx->lock); \
662 return seq_list_start(&ctx->rq_lists[type], *pos); \
665 static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \
668 struct blk_mq_ctx *ctx = m->private; \
670 return seq_list_next(v, &ctx->rq_lists[type], pos); \
673 static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \
674 __releases(&ctx->lock) \
676 struct blk_mq_ctx *ctx = m->private; \
678 spin_unlock(&ctx->lock); \
681 static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \
682 .start = ctx_##name##_rq_list_start, \
683 .next = ctx_##name##_rq_list_next, \
684 .stop = ctx_##name##_rq_list_stop, \
685 .show = blk_mq_debugfs_rq_show, \
688 CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
689 CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
690 CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
692 static int ctx_dispatched_show(void *data, struct seq_file *m)
694 struct blk_mq_ctx *ctx = data;
696 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
700 static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
701 size_t count, loff_t *ppos)
703 struct blk_mq_ctx *ctx = data;
705 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
709 static int ctx_merged_show(void *data, struct seq_file *m)
711 struct blk_mq_ctx *ctx = data;
713 seq_printf(m, "%lu\n", ctx->rq_merged);
717 static ssize_t ctx_merged_write(void *data, const char __user *buf,
718 size_t count, loff_t *ppos)
720 struct blk_mq_ctx *ctx = data;
726 static int ctx_completed_show(void *data, struct seq_file *m)
728 struct blk_mq_ctx *ctx = data;
730 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
734 static ssize_t ctx_completed_write(void *data, const char __user *buf,
735 size_t count, loff_t *ppos)
737 struct blk_mq_ctx *ctx = data;
739 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
743 static int blk_mq_debugfs_show(struct seq_file *m, void *v)
745 const struct blk_mq_debugfs_attr *attr = m->private;
746 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
748 return attr->show(data, m);
751 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
752 size_t count, loff_t *ppos)
754 struct seq_file *m = file->private_data;
755 const struct blk_mq_debugfs_attr *attr = m->private;
756 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
759 * Attributes that only implement .seq_ops are read-only and 'attr' is
760 * the same with 'data' in this case.
762 if (attr == data || !attr->write)
765 return attr->write(data, buf, count, ppos);
768 static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
770 const struct blk_mq_debugfs_attr *attr = inode->i_private;
771 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
776 ret = seq_open(file, attr->seq_ops);
778 m = file->private_data;
784 if (WARN_ON_ONCE(!attr->show))
787 return single_open(file, blk_mq_debugfs_show, inode->i_private);
790 static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
792 const struct blk_mq_debugfs_attr *attr = inode->i_private;
795 return single_release(inode, file);
797 return seq_release(inode, file);
800 static const struct file_operations blk_mq_debugfs_fops = {
801 .open = blk_mq_debugfs_open,
803 .write = blk_mq_debugfs_write,
805 .release = blk_mq_debugfs_release,
808 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
809 {"state", 0400, hctx_state_show},
810 {"flags", 0400, hctx_flags_show},
811 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
812 {"busy", 0400, hctx_busy_show},
813 {"ctx_map", 0400, hctx_ctx_map_show},
814 {"tags", 0400, hctx_tags_show},
815 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
816 {"sched_tags", 0400, hctx_sched_tags_show},
817 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
818 {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
819 {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
820 {"queued", 0600, hctx_queued_show, hctx_queued_write},
821 {"run", 0600, hctx_run_show, hctx_run_write},
822 {"active", 0400, hctx_active_show},
823 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
824 {"type", 0400, hctx_type_show},
828 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
829 {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
830 {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
831 {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
832 {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
833 {"merged", 0600, ctx_merged_show, ctx_merged_write},
834 {"completed", 0600, ctx_completed_show, ctx_completed_write},
838 static bool debugfs_create_files(struct dentry *parent, void *data,
839 const struct blk_mq_debugfs_attr *attr)
841 d_inode(parent)->i_private = data;
843 for (; attr->name; attr++) {
844 if (!debugfs_create_file(attr->name, attr->mode, parent,
845 (void *)attr, &blk_mq_debugfs_fops))
851 int blk_mq_debugfs_register(struct request_queue *q)
853 struct blk_mq_hw_ctx *hctx;
856 if (!blk_debugfs_root)
859 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
864 if (!debugfs_create_files(q->debugfs_dir, q,
865 blk_mq_debugfs_queue_attrs))
869 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
870 * didn't exist yet (because we don't know what to name the directory
871 * until the queue is registered to a gendisk).
873 if (q->elevator && !q->sched_debugfs_dir)
874 blk_mq_debugfs_register_sched(q);
876 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
877 queue_for_each_hw_ctx(q, hctx, i) {
878 if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
880 if (q->elevator && !hctx->sched_debugfs_dir &&
881 blk_mq_debugfs_register_sched_hctx(q, hctx))
886 struct rq_qos *rqos = q->rq_qos;
889 blk_mq_debugfs_register_rqos(rqos);
897 blk_mq_debugfs_unregister(q);
901 void blk_mq_debugfs_unregister(struct request_queue *q)
903 debugfs_remove_recursive(q->debugfs_dir);
904 q->sched_debugfs_dir = NULL;
905 q->debugfs_dir = NULL;
908 static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
909 struct blk_mq_ctx *ctx)
911 struct dentry *ctx_dir;
914 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
915 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
919 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
925 int blk_mq_debugfs_register_hctx(struct request_queue *q,
926 struct blk_mq_hw_ctx *hctx)
928 struct blk_mq_ctx *ctx;
935 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
936 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
937 if (!hctx->debugfs_dir)
940 if (!debugfs_create_files(hctx->debugfs_dir, hctx,
941 blk_mq_debugfs_hctx_attrs))
944 hctx_for_each_ctx(hctx, ctx, i) {
945 if (blk_mq_debugfs_register_ctx(hctx, ctx))
952 blk_mq_debugfs_unregister_hctx(hctx);
956 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
958 debugfs_remove_recursive(hctx->debugfs_dir);
959 hctx->sched_debugfs_dir = NULL;
960 hctx->debugfs_dir = NULL;
963 int blk_mq_debugfs_register_hctxs(struct request_queue *q)
965 struct blk_mq_hw_ctx *hctx;
968 queue_for_each_hw_ctx(q, hctx, i) {
969 if (blk_mq_debugfs_register_hctx(q, hctx))
976 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
978 struct blk_mq_hw_ctx *hctx;
981 queue_for_each_hw_ctx(q, hctx, i)
982 blk_mq_debugfs_unregister_hctx(hctx);
985 int blk_mq_debugfs_register_sched(struct request_queue *q)
987 struct elevator_type *e = q->elevator->type;
992 if (!e->queue_debugfs_attrs)
995 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
996 if (!q->sched_debugfs_dir)
999 if (!debugfs_create_files(q->sched_debugfs_dir, q,
1000 e->queue_debugfs_attrs))
1006 blk_mq_debugfs_unregister_sched(q);
1010 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
1012 debugfs_remove_recursive(q->sched_debugfs_dir);
1013 q->sched_debugfs_dir = NULL;
1016 void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
1018 debugfs_remove_recursive(rqos->debugfs_dir);
1019 rqos->debugfs_dir = NULL;
1022 int blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
1024 struct request_queue *q = rqos->q;
1025 const char *dir_name = rq_qos_id_to_name(rqos->id);
1027 if (!q->debugfs_dir)
1030 if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
1033 if (!q->rqos_debugfs_dir) {
1034 q->rqos_debugfs_dir = debugfs_create_dir("rqos",
1036 if (!q->rqos_debugfs_dir)
1040 rqos->debugfs_dir = debugfs_create_dir(dir_name,
1041 rqos->q->rqos_debugfs_dir);
1042 if (!rqos->debugfs_dir)
1045 if (!debugfs_create_files(rqos->debugfs_dir, rqos,
1046 rqos->ops->debugfs_attrs))
1050 blk_mq_debugfs_unregister_rqos(rqos);
1054 void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
1056 debugfs_remove_recursive(q->rqos_debugfs_dir);
1057 q->rqos_debugfs_dir = NULL;
1060 int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
1061 struct blk_mq_hw_ctx *hctx)
1063 struct elevator_type *e = q->elevator->type;
1065 if (!hctx->debugfs_dir)
1068 if (!e->hctx_debugfs_attrs)
1071 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
1073 if (!hctx->sched_debugfs_dir)
1076 if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx,
1077 e->hctx_debugfs_attrs))
1083 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
1085 debugfs_remove_recursive(hctx->sched_debugfs_dir);
1086 hctx->sched_debugfs_dir = NULL;