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"
27 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
29 if (stat->nr_samples) {
30 seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
31 stat->nr_samples, stat->mean, stat->min, stat->max);
33 seq_puts(m, "samples=0");
37 static int queue_poll_stat_show(void *data, struct seq_file *m)
39 struct request_queue *q = data;
42 for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
43 seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket));
44 print_stat(m, &q->poll_stat[2*bucket]);
47 seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket));
48 print_stat(m, &q->poll_stat[2*bucket+1]);
54 static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
55 __acquires(&q->requeue_lock)
57 struct request_queue *q = m->private;
59 spin_lock_irq(&q->requeue_lock);
60 return seq_list_start(&q->requeue_list, *pos);
63 static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
65 struct request_queue *q = m->private;
67 return seq_list_next(v, &q->requeue_list, pos);
70 static void queue_requeue_list_stop(struct seq_file *m, void *v)
71 __releases(&q->requeue_lock)
73 struct request_queue *q = m->private;
75 spin_unlock_irq(&q->requeue_lock);
78 static const struct seq_operations queue_requeue_list_seq_ops = {
79 .start = queue_requeue_list_start,
80 .next = queue_requeue_list_next,
81 .stop = queue_requeue_list_stop,
82 .show = blk_mq_debugfs_rq_show,
85 static int blk_flags_show(struct seq_file *m, const unsigned long flags,
86 const char *const *flag_name, int flag_name_count)
91 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
92 if (!(flags & BIT(i)))
97 if (i < flag_name_count && flag_name[i])
98 seq_puts(m, flag_name[i]);
100 seq_printf(m, "%d", i);
105 static int queue_pm_only_show(void *data, struct seq_file *m)
107 struct request_queue *q = data;
109 seq_printf(m, "%d\n", atomic_read(&q->pm_only));
113 #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
114 static const char *const blk_queue_flag_name[] = {
115 QUEUE_FLAG_NAME(QUEUED),
116 QUEUE_FLAG_NAME(STOPPED),
117 QUEUE_FLAG_NAME(DYING),
118 QUEUE_FLAG_NAME(BYPASS),
119 QUEUE_FLAG_NAME(BIDI),
120 QUEUE_FLAG_NAME(NOMERGES),
121 QUEUE_FLAG_NAME(SAME_COMP),
122 QUEUE_FLAG_NAME(FAIL_IO),
123 QUEUE_FLAG_NAME(NONROT),
124 QUEUE_FLAG_NAME(IO_STAT),
125 QUEUE_FLAG_NAME(DISCARD),
126 QUEUE_FLAG_NAME(NOXMERGES),
127 QUEUE_FLAG_NAME(ADD_RANDOM),
128 QUEUE_FLAG_NAME(SECERASE),
129 QUEUE_FLAG_NAME(SAME_FORCE),
130 QUEUE_FLAG_NAME(DEAD),
131 QUEUE_FLAG_NAME(INIT_DONE),
132 QUEUE_FLAG_NAME(NO_SG_MERGE),
133 QUEUE_FLAG_NAME(POLL),
135 QUEUE_FLAG_NAME(FUA),
136 QUEUE_FLAG_NAME(FLUSH_NQ),
137 QUEUE_FLAG_NAME(DAX),
138 QUEUE_FLAG_NAME(STATS),
139 QUEUE_FLAG_NAME(POLL_STATS),
140 QUEUE_FLAG_NAME(REGISTERED),
141 QUEUE_FLAG_NAME(SCSI_PASSTHROUGH),
142 QUEUE_FLAG_NAME(QUIESCED),
144 #undef QUEUE_FLAG_NAME
146 static int queue_state_show(void *data, struct seq_file *m)
148 struct request_queue *q = data;
150 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
151 ARRAY_SIZE(blk_queue_flag_name));
156 static ssize_t queue_state_write(void *data, const char __user *buf,
157 size_t count, loff_t *ppos)
159 struct request_queue *q = data;
160 char opbuf[16] = { }, *op;
163 * The "state" attribute is removed after blk_cleanup_queue() has called
164 * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
165 * triggering a use-after-free.
167 if (blk_queue_dead(q))
170 if (count >= sizeof(opbuf)) {
171 pr_err("%s: operation too long\n", __func__);
175 if (copy_from_user(opbuf, buf, count))
177 op = strstrip(opbuf);
178 if (strcmp(op, "run") == 0) {
179 blk_mq_run_hw_queues(q, true);
180 } else if (strcmp(op, "start") == 0) {
181 blk_mq_start_stopped_hw_queues(q, true);
182 } else if (strcmp(op, "kick") == 0) {
183 blk_mq_kick_requeue_list(q);
185 pr_err("%s: unsupported operation '%s'\n", __func__, op);
187 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
193 static int queue_write_hint_show(void *data, struct seq_file *m)
195 struct request_queue *q = data;
198 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
199 seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
204 static ssize_t queue_write_hint_store(void *data, const char __user *buf,
205 size_t count, loff_t *ppos)
207 struct request_queue *q = data;
210 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
211 q->write_hints[i] = 0;
216 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
217 { "poll_stat", 0400, queue_poll_stat_show },
218 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
219 { "pm_only", 0600, queue_pm_only_show, NULL },
220 { "state", 0600, queue_state_show, queue_state_write },
221 { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
222 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
226 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
227 static const char *const hctx_state_name[] = {
228 HCTX_STATE_NAME(STOPPED),
229 HCTX_STATE_NAME(TAG_ACTIVE),
230 HCTX_STATE_NAME(SCHED_RESTART),
232 #undef HCTX_STATE_NAME
234 static int hctx_state_show(void *data, struct seq_file *m)
236 struct blk_mq_hw_ctx *hctx = data;
238 blk_flags_show(m, hctx->state, hctx_state_name,
239 ARRAY_SIZE(hctx_state_name));
244 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
245 static const char *const alloc_policy_name[] = {
246 BLK_TAG_ALLOC_NAME(FIFO),
247 BLK_TAG_ALLOC_NAME(RR),
249 #undef BLK_TAG_ALLOC_NAME
251 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
252 static const char *const hctx_flag_name[] = {
253 HCTX_FLAG_NAME(SHOULD_MERGE),
254 HCTX_FLAG_NAME(TAG_SHARED),
255 HCTX_FLAG_NAME(SG_MERGE),
256 HCTX_FLAG_NAME(BLOCKING),
257 HCTX_FLAG_NAME(NO_SCHED),
259 #undef HCTX_FLAG_NAME
261 static int hctx_flags_show(void *data, struct seq_file *m)
263 struct blk_mq_hw_ctx *hctx = data;
264 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
266 seq_puts(m, "alloc_policy=");
267 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
268 alloc_policy_name[alloc_policy])
269 seq_puts(m, alloc_policy_name[alloc_policy]);
271 seq_printf(m, "%d", alloc_policy);
274 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
275 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
280 #define REQ_OP_NAME(name) [REQ_OP_##name] = #name
281 static const char *const op_name[] = {
285 REQ_OP_NAME(DISCARD),
286 REQ_OP_NAME(ZONE_REPORT),
287 REQ_OP_NAME(SECURE_ERASE),
288 REQ_OP_NAME(ZONE_RESET),
289 REQ_OP_NAME(WRITE_SAME),
290 REQ_OP_NAME(WRITE_ZEROES),
291 REQ_OP_NAME(SCSI_IN),
292 REQ_OP_NAME(SCSI_OUT),
294 REQ_OP_NAME(DRV_OUT),
298 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
299 static const char *const cmd_flag_name[] = {
300 CMD_FLAG_NAME(FAILFAST_DEV),
301 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
302 CMD_FLAG_NAME(FAILFAST_DRIVER),
306 CMD_FLAG_NAME(NOMERGE),
308 CMD_FLAG_NAME(INTEGRITY),
310 CMD_FLAG_NAME(PREFLUSH),
311 CMD_FLAG_NAME(RAHEAD),
312 CMD_FLAG_NAME(BACKGROUND),
313 CMD_FLAG_NAME(NOUNMAP),
314 CMD_FLAG_NAME(NOWAIT),
318 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
319 static const char *const rqf_name[] = {
323 RQF_NAME(SOFTBARRIER),
325 RQF_NAME(MIXED_MERGE),
326 RQF_NAME(MQ_INFLIGHT),
338 RQF_NAME(SPECIAL_PAYLOAD),
339 RQF_NAME(ZONE_WRITE_LOCKED),
340 RQF_NAME(MQ_POLL_SLEPT),
344 static const char *const blk_mq_rq_state_name_array[] = {
345 [MQ_RQ_IDLE] = "idle",
346 [MQ_RQ_IN_FLIGHT] = "in_flight",
347 [MQ_RQ_COMPLETE] = "complete",
350 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
352 if (WARN_ON_ONCE((unsigned int)rq_state >=
353 ARRAY_SIZE(blk_mq_rq_state_name_array)))
355 return blk_mq_rq_state_name_array[rq_state];
358 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
360 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
361 const unsigned int op = rq->cmd_flags & REQ_OP_MASK;
363 seq_printf(m, "%p {.op=", rq);
364 if (op < ARRAY_SIZE(op_name) && op_name[op])
365 seq_printf(m, "%s", op_name[op]);
367 seq_printf(m, "%d", op);
368 seq_puts(m, ", .cmd_flags=");
369 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
370 ARRAY_SIZE(cmd_flag_name));
371 seq_puts(m, ", .rq_flags=");
372 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
373 ARRAY_SIZE(rqf_name));
374 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
375 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
378 mq_ops->show_rq(m, rq);
382 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
384 int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
386 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
388 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
390 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
391 __acquires(&hctx->lock)
393 struct blk_mq_hw_ctx *hctx = m->private;
395 spin_lock(&hctx->lock);
396 return seq_list_start(&hctx->dispatch, *pos);
399 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
401 struct blk_mq_hw_ctx *hctx = m->private;
403 return seq_list_next(v, &hctx->dispatch, pos);
406 static void hctx_dispatch_stop(struct seq_file *m, void *v)
407 __releases(&hctx->lock)
409 struct blk_mq_hw_ctx *hctx = m->private;
411 spin_unlock(&hctx->lock);
414 static const struct seq_operations hctx_dispatch_seq_ops = {
415 .start = hctx_dispatch_start,
416 .next = hctx_dispatch_next,
417 .stop = hctx_dispatch_stop,
418 .show = blk_mq_debugfs_rq_show,
421 struct show_busy_params {
423 struct blk_mq_hw_ctx *hctx;
427 * Note: the state of a request may change while this function is in progress,
428 * e.g. due to a concurrent blk_mq_finish_request() call.
430 static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
432 const struct show_busy_params *params = data;
434 if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx)
435 __blk_mq_debugfs_rq_show(params->m,
436 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 int hctx_ctx_map_show(void *data, struct seq_file *m)
452 struct blk_mq_hw_ctx *hctx = data;
454 sbitmap_bitmap_show(&hctx->ctx_map, m);
458 static void blk_mq_debugfs_tags_show(struct seq_file *m,
459 struct blk_mq_tags *tags)
461 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
462 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
463 seq_printf(m, "active_queues=%d\n",
464 atomic_read(&tags->active_queues));
466 seq_puts(m, "\nbitmap_tags:\n");
467 sbitmap_queue_show(&tags->bitmap_tags, m);
469 if (tags->nr_reserved_tags) {
470 seq_puts(m, "\nbreserved_tags:\n");
471 sbitmap_queue_show(&tags->breserved_tags, m);
475 static int hctx_tags_show(void *data, struct seq_file *m)
477 struct blk_mq_hw_ctx *hctx = data;
478 struct request_queue *q = hctx->queue;
481 res = mutex_lock_interruptible(&q->sysfs_lock);
485 blk_mq_debugfs_tags_show(m, hctx->tags);
486 mutex_unlock(&q->sysfs_lock);
492 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
494 struct blk_mq_hw_ctx *hctx = data;
495 struct request_queue *q = hctx->queue;
498 res = mutex_lock_interruptible(&q->sysfs_lock);
502 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
503 mutex_unlock(&q->sysfs_lock);
509 static int hctx_sched_tags_show(void *data, struct seq_file *m)
511 struct blk_mq_hw_ctx *hctx = data;
512 struct request_queue *q = hctx->queue;
515 res = mutex_lock_interruptible(&q->sysfs_lock);
518 if (hctx->sched_tags)
519 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
520 mutex_unlock(&q->sysfs_lock);
526 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
528 struct blk_mq_hw_ctx *hctx = data;
529 struct request_queue *q = hctx->queue;
532 res = mutex_lock_interruptible(&q->sysfs_lock);
535 if (hctx->sched_tags)
536 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
537 mutex_unlock(&q->sysfs_lock);
543 static int hctx_io_poll_show(void *data, struct seq_file *m)
545 struct blk_mq_hw_ctx *hctx = data;
547 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
548 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
549 seq_printf(m, "success=%lu\n", hctx->poll_success);
553 static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
554 size_t count, loff_t *ppos)
556 struct blk_mq_hw_ctx *hctx = data;
558 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
562 static int hctx_dispatched_show(void *data, struct seq_file *m)
564 struct blk_mq_hw_ctx *hctx = data;
567 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
569 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
570 unsigned int d = 1U << (i - 1);
572 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
575 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
579 static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
580 size_t count, loff_t *ppos)
582 struct blk_mq_hw_ctx *hctx = data;
585 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
586 hctx->dispatched[i] = 0;
590 static int hctx_queued_show(void *data, struct seq_file *m)
592 struct blk_mq_hw_ctx *hctx = data;
594 seq_printf(m, "%lu\n", hctx->queued);
598 static ssize_t hctx_queued_write(void *data, const char __user *buf,
599 size_t count, loff_t *ppos)
601 struct blk_mq_hw_ctx *hctx = data;
607 static int hctx_run_show(void *data, struct seq_file *m)
609 struct blk_mq_hw_ctx *hctx = data;
611 seq_printf(m, "%lu\n", hctx->run);
615 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
618 struct blk_mq_hw_ctx *hctx = data;
624 static int hctx_active_show(void *data, struct seq_file *m)
626 struct blk_mq_hw_ctx *hctx = data;
628 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
632 static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
634 struct blk_mq_hw_ctx *hctx = data;
636 seq_printf(m, "%u\n", hctx->dispatch_busy);
640 static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
641 __acquires(&ctx->lock)
643 struct blk_mq_ctx *ctx = m->private;
645 spin_lock(&ctx->lock);
646 return seq_list_start(&ctx->rq_list, *pos);
649 static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
651 struct blk_mq_ctx *ctx = m->private;
653 return seq_list_next(v, &ctx->rq_list, pos);
656 static void ctx_rq_list_stop(struct seq_file *m, void *v)
657 __releases(&ctx->lock)
659 struct blk_mq_ctx *ctx = m->private;
661 spin_unlock(&ctx->lock);
664 static const struct seq_operations ctx_rq_list_seq_ops = {
665 .start = ctx_rq_list_start,
666 .next = ctx_rq_list_next,
667 .stop = ctx_rq_list_stop,
668 .show = blk_mq_debugfs_rq_show,
670 static int ctx_dispatched_show(void *data, struct seq_file *m)
672 struct blk_mq_ctx *ctx = data;
674 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
678 static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
679 size_t count, loff_t *ppos)
681 struct blk_mq_ctx *ctx = data;
683 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
687 static int ctx_merged_show(void *data, struct seq_file *m)
689 struct blk_mq_ctx *ctx = data;
691 seq_printf(m, "%lu\n", ctx->rq_merged);
695 static ssize_t ctx_merged_write(void *data, const char __user *buf,
696 size_t count, loff_t *ppos)
698 struct blk_mq_ctx *ctx = data;
704 static int ctx_completed_show(void *data, struct seq_file *m)
706 struct blk_mq_ctx *ctx = data;
708 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
712 static ssize_t ctx_completed_write(void *data, const char __user *buf,
713 size_t count, loff_t *ppos)
715 struct blk_mq_ctx *ctx = data;
717 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
721 static int blk_mq_debugfs_show(struct seq_file *m, void *v)
723 const struct blk_mq_debugfs_attr *attr = m->private;
724 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
726 return attr->show(data, m);
729 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
730 size_t count, loff_t *ppos)
732 struct seq_file *m = file->private_data;
733 const struct blk_mq_debugfs_attr *attr = m->private;
734 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
737 * Attributes that only implement .seq_ops are read-only and 'attr' is
738 * the same with 'data' in this case.
740 if (attr == data || !attr->write)
743 return attr->write(data, buf, count, ppos);
746 static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
748 const struct blk_mq_debugfs_attr *attr = inode->i_private;
749 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
754 ret = seq_open(file, attr->seq_ops);
756 m = file->private_data;
762 if (WARN_ON_ONCE(!attr->show))
765 return single_open(file, blk_mq_debugfs_show, inode->i_private);
768 static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
770 const struct blk_mq_debugfs_attr *attr = inode->i_private;
773 return single_release(inode, file);
775 return seq_release(inode, file);
778 static const struct file_operations blk_mq_debugfs_fops = {
779 .open = blk_mq_debugfs_open,
781 .write = blk_mq_debugfs_write,
783 .release = blk_mq_debugfs_release,
786 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
787 {"state", 0400, hctx_state_show},
788 {"flags", 0400, hctx_flags_show},
789 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
790 {"busy", 0400, hctx_busy_show},
791 {"ctx_map", 0400, hctx_ctx_map_show},
792 {"tags", 0400, hctx_tags_show},
793 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
794 {"sched_tags", 0400, hctx_sched_tags_show},
795 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
796 {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
797 {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
798 {"queued", 0600, hctx_queued_show, hctx_queued_write},
799 {"run", 0600, hctx_run_show, hctx_run_write},
800 {"active", 0400, hctx_active_show},
801 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
805 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
806 {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops},
807 {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
808 {"merged", 0600, ctx_merged_show, ctx_merged_write},
809 {"completed", 0600, ctx_completed_show, ctx_completed_write},
813 static bool debugfs_create_files(struct dentry *parent, void *data,
814 const struct blk_mq_debugfs_attr *attr)
816 d_inode(parent)->i_private = data;
818 for (; attr->name; attr++) {
819 if (!debugfs_create_file(attr->name, attr->mode, parent,
820 (void *)attr, &blk_mq_debugfs_fops))
826 int blk_mq_debugfs_register(struct request_queue *q)
828 struct blk_mq_hw_ctx *hctx;
831 if (!blk_debugfs_root)
834 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
839 if (!debugfs_create_files(q->debugfs_dir, q,
840 blk_mq_debugfs_queue_attrs))
844 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
845 * didn't exist yet (because we don't know what to name the directory
846 * until the queue is registered to a gendisk).
848 if (q->elevator && !q->sched_debugfs_dir)
849 blk_mq_debugfs_register_sched(q);
851 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
852 queue_for_each_hw_ctx(q, hctx, i) {
853 if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
855 if (q->elevator && !hctx->sched_debugfs_dir &&
856 blk_mq_debugfs_register_sched_hctx(q, hctx))
863 blk_mq_debugfs_unregister(q);
867 void blk_mq_debugfs_unregister(struct request_queue *q)
869 debugfs_remove_recursive(q->debugfs_dir);
870 q->sched_debugfs_dir = NULL;
871 q->debugfs_dir = NULL;
874 static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
875 struct blk_mq_ctx *ctx)
877 struct dentry *ctx_dir;
880 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
881 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
885 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
891 int blk_mq_debugfs_register_hctx(struct request_queue *q,
892 struct blk_mq_hw_ctx *hctx)
894 struct blk_mq_ctx *ctx;
901 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
902 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
903 if (!hctx->debugfs_dir)
906 if (!debugfs_create_files(hctx->debugfs_dir, hctx,
907 blk_mq_debugfs_hctx_attrs))
910 hctx_for_each_ctx(hctx, ctx, i) {
911 if (blk_mq_debugfs_register_ctx(hctx, ctx))
918 blk_mq_debugfs_unregister_hctx(hctx);
922 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
924 debugfs_remove_recursive(hctx->debugfs_dir);
925 hctx->sched_debugfs_dir = NULL;
926 hctx->debugfs_dir = NULL;
929 int blk_mq_debugfs_register_hctxs(struct request_queue *q)
931 struct blk_mq_hw_ctx *hctx;
934 queue_for_each_hw_ctx(q, hctx, i) {
935 if (blk_mq_debugfs_register_hctx(q, hctx))
942 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
944 struct blk_mq_hw_ctx *hctx;
947 queue_for_each_hw_ctx(q, hctx, i)
948 blk_mq_debugfs_unregister_hctx(hctx);
951 int blk_mq_debugfs_register_sched(struct request_queue *q)
953 struct elevator_type *e = q->elevator->type;
958 if (!e->queue_debugfs_attrs)
961 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
962 if (!q->sched_debugfs_dir)
965 if (!debugfs_create_files(q->sched_debugfs_dir, q,
966 e->queue_debugfs_attrs))
972 blk_mq_debugfs_unregister_sched(q);
976 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
978 debugfs_remove_recursive(q->sched_debugfs_dir);
979 q->sched_debugfs_dir = NULL;
982 int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
983 struct blk_mq_hw_ctx *hctx)
985 struct elevator_type *e = q->elevator->type;
987 if (!hctx->debugfs_dir)
990 if (!e->hctx_debugfs_attrs)
993 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
995 if (!hctx->sched_debugfs_dir)
998 if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx,
999 e->hctx_debugfs_attrs))
1005 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
1007 debugfs_remove_recursive(hctx->sched_debugfs_dir);
1008 hctx->sched_debugfs_dir = NULL;