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 #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
106 static const char *const blk_queue_flag_name[] = {
107 QUEUE_FLAG_NAME(QUEUED),
108 QUEUE_FLAG_NAME(STOPPED),
109 QUEUE_FLAG_NAME(DYING),
110 QUEUE_FLAG_NAME(BYPASS),
111 QUEUE_FLAG_NAME(BIDI),
112 QUEUE_FLAG_NAME(NOMERGES),
113 QUEUE_FLAG_NAME(SAME_COMP),
114 QUEUE_FLAG_NAME(FAIL_IO),
115 QUEUE_FLAG_NAME(NONROT),
116 QUEUE_FLAG_NAME(IO_STAT),
117 QUEUE_FLAG_NAME(DISCARD),
118 QUEUE_FLAG_NAME(NOXMERGES),
119 QUEUE_FLAG_NAME(ADD_RANDOM),
120 QUEUE_FLAG_NAME(SECERASE),
121 QUEUE_FLAG_NAME(SAME_FORCE),
122 QUEUE_FLAG_NAME(DEAD),
123 QUEUE_FLAG_NAME(INIT_DONE),
124 QUEUE_FLAG_NAME(NO_SG_MERGE),
125 QUEUE_FLAG_NAME(POLL),
127 QUEUE_FLAG_NAME(FUA),
128 QUEUE_FLAG_NAME(FLUSH_NQ),
129 QUEUE_FLAG_NAME(DAX),
130 QUEUE_FLAG_NAME(STATS),
131 QUEUE_FLAG_NAME(POLL_STATS),
132 QUEUE_FLAG_NAME(REGISTERED),
133 QUEUE_FLAG_NAME(SCSI_PASSTHROUGH),
134 QUEUE_FLAG_NAME(QUIESCED),
135 QUEUE_FLAG_NAME(PREEMPT_ONLY),
137 #undef QUEUE_FLAG_NAME
139 static int queue_state_show(void *data, struct seq_file *m)
141 struct request_queue *q = data;
143 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
144 ARRAY_SIZE(blk_queue_flag_name));
149 static ssize_t queue_state_write(void *data, const char __user *buf,
150 size_t count, loff_t *ppos)
152 struct request_queue *q = data;
153 char opbuf[16] = { }, *op;
156 * The "state" attribute is removed after blk_cleanup_queue() has called
157 * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
158 * triggering a use-after-free.
160 if (blk_queue_dead(q))
163 if (count >= sizeof(opbuf)) {
164 pr_err("%s: operation too long\n", __func__);
168 if (copy_from_user(opbuf, buf, count))
170 op = strstrip(opbuf);
171 if (strcmp(op, "run") == 0) {
172 blk_mq_run_hw_queues(q, true);
173 } else if (strcmp(op, "start") == 0) {
174 blk_mq_start_stopped_hw_queues(q, true);
175 } else if (strcmp(op, "kick") == 0) {
176 blk_mq_kick_requeue_list(q);
178 pr_err("%s: unsupported operation '%s'\n", __func__, op);
180 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
186 static int queue_write_hint_show(void *data, struct seq_file *m)
188 struct request_queue *q = data;
191 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
192 seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
197 static ssize_t queue_write_hint_store(void *data, const char __user *buf,
198 size_t count, loff_t *ppos)
200 struct request_queue *q = data;
203 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
204 q->write_hints[i] = 0;
209 static int queue_zone_wlock_show(void *data, struct seq_file *m)
211 struct request_queue *q = data;
214 if (!q->seq_zones_wlock)
217 for (i = 0; i < blk_queue_nr_zones(q); i++)
218 if (test_bit(i, q->seq_zones_wlock))
219 seq_printf(m, "%u\n", i);
224 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
225 { "poll_stat", 0400, queue_poll_stat_show },
226 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
227 { "state", 0600, queue_state_show, queue_state_write },
228 { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
229 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
233 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
234 static const char *const hctx_state_name[] = {
235 HCTX_STATE_NAME(STOPPED),
236 HCTX_STATE_NAME(TAG_ACTIVE),
237 HCTX_STATE_NAME(SCHED_RESTART),
238 HCTX_STATE_NAME(START_ON_RUN),
240 #undef HCTX_STATE_NAME
242 static int hctx_state_show(void *data, struct seq_file *m)
244 struct blk_mq_hw_ctx *hctx = data;
246 blk_flags_show(m, hctx->state, hctx_state_name,
247 ARRAY_SIZE(hctx_state_name));
252 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
253 static const char *const alloc_policy_name[] = {
254 BLK_TAG_ALLOC_NAME(FIFO),
255 BLK_TAG_ALLOC_NAME(RR),
257 #undef BLK_TAG_ALLOC_NAME
259 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
260 static const char *const hctx_flag_name[] = {
261 HCTX_FLAG_NAME(SHOULD_MERGE),
262 HCTX_FLAG_NAME(TAG_SHARED),
263 HCTX_FLAG_NAME(SG_MERGE),
264 HCTX_FLAG_NAME(BLOCKING),
265 HCTX_FLAG_NAME(NO_SCHED),
267 #undef HCTX_FLAG_NAME
269 static int hctx_flags_show(void *data, struct seq_file *m)
271 struct blk_mq_hw_ctx *hctx = data;
272 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
274 seq_puts(m, "alloc_policy=");
275 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
276 alloc_policy_name[alloc_policy])
277 seq_puts(m, alloc_policy_name[alloc_policy]);
279 seq_printf(m, "%d", alloc_policy);
282 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
283 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
288 #define REQ_OP_NAME(name) [REQ_OP_##name] = #name
289 static const char *const op_name[] = {
293 REQ_OP_NAME(DISCARD),
294 REQ_OP_NAME(ZONE_REPORT),
295 REQ_OP_NAME(SECURE_ERASE),
296 REQ_OP_NAME(ZONE_RESET),
297 REQ_OP_NAME(WRITE_SAME),
298 REQ_OP_NAME(WRITE_ZEROES),
299 REQ_OP_NAME(SCSI_IN),
300 REQ_OP_NAME(SCSI_OUT),
302 REQ_OP_NAME(DRV_OUT),
306 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
307 static const char *const cmd_flag_name[] = {
308 CMD_FLAG_NAME(FAILFAST_DEV),
309 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
310 CMD_FLAG_NAME(FAILFAST_DRIVER),
314 CMD_FLAG_NAME(NOMERGE),
316 CMD_FLAG_NAME(INTEGRITY),
318 CMD_FLAG_NAME(PREFLUSH),
319 CMD_FLAG_NAME(RAHEAD),
320 CMD_FLAG_NAME(BACKGROUND),
321 CMD_FLAG_NAME(NOUNMAP),
322 CMD_FLAG_NAME(NOWAIT),
326 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
327 static const char *const rqf_name[] = {
331 RQF_NAME(SOFTBARRIER),
333 RQF_NAME(MIXED_MERGE),
334 RQF_NAME(MQ_INFLIGHT),
346 RQF_NAME(SPECIAL_PAYLOAD),
347 RQF_NAME(ZONE_WRITE_LOCKED),
348 RQF_NAME(MQ_TIMEOUT_EXPIRED),
349 RQF_NAME(MQ_POLL_SLEPT),
353 static const char *const blk_mq_rq_state_name_array[] = {
354 [MQ_RQ_IDLE] = "idle",
355 [MQ_RQ_IN_FLIGHT] = "in_flight",
356 [MQ_RQ_COMPLETE] = "complete",
359 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
361 if (WARN_ON_ONCE((unsigned int)rq_state >
362 ARRAY_SIZE(blk_mq_rq_state_name_array)))
364 return blk_mq_rq_state_name_array[rq_state];
367 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
369 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
370 const unsigned int op = rq->cmd_flags & REQ_OP_MASK;
372 seq_printf(m, "%p {.op=", rq);
373 if (op < ARRAY_SIZE(op_name) && op_name[op])
374 seq_printf(m, "%s", op_name[op]);
376 seq_printf(m, "%d", op);
377 seq_puts(m, ", .cmd_flags=");
378 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
379 ARRAY_SIZE(cmd_flag_name));
380 seq_puts(m, ", .rq_flags=");
381 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
382 ARRAY_SIZE(rqf_name));
383 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
384 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
387 mq_ops->show_rq(m, rq);
391 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
393 int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
395 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
397 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
399 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
400 __acquires(&hctx->lock)
402 struct blk_mq_hw_ctx *hctx = m->private;
404 spin_lock(&hctx->lock);
405 return seq_list_start(&hctx->dispatch, *pos);
408 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
410 struct blk_mq_hw_ctx *hctx = m->private;
412 return seq_list_next(v, &hctx->dispatch, pos);
415 static void hctx_dispatch_stop(struct seq_file *m, void *v)
416 __releases(&hctx->lock)
418 struct blk_mq_hw_ctx *hctx = m->private;
420 spin_unlock(&hctx->lock);
423 static const struct seq_operations hctx_dispatch_seq_ops = {
424 .start = hctx_dispatch_start,
425 .next = hctx_dispatch_next,
426 .stop = hctx_dispatch_stop,
427 .show = blk_mq_debugfs_rq_show,
430 struct show_busy_params {
432 struct blk_mq_hw_ctx *hctx;
436 * Note: the state of a request may change while this function is in progress,
437 * e.g. due to a concurrent blk_mq_finish_request() call.
439 static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
441 const struct show_busy_params *params = data;
443 if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx &&
444 blk_mq_rq_state(rq) != MQ_RQ_IDLE)
445 __blk_mq_debugfs_rq_show(params->m,
446 list_entry_rq(&rq->queuelist));
449 static int hctx_busy_show(void *data, struct seq_file *m)
451 struct blk_mq_hw_ctx *hctx = data;
452 struct show_busy_params params = { .m = m, .hctx = hctx };
454 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
460 static int hctx_ctx_map_show(void *data, struct seq_file *m)
462 struct blk_mq_hw_ctx *hctx = data;
464 sbitmap_bitmap_show(&hctx->ctx_map, m);
468 static void blk_mq_debugfs_tags_show(struct seq_file *m,
469 struct blk_mq_tags *tags)
471 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
472 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
473 seq_printf(m, "active_queues=%d\n",
474 atomic_read(&tags->active_queues));
476 seq_puts(m, "\nbitmap_tags:\n");
477 sbitmap_queue_show(&tags->bitmap_tags, m);
479 if (tags->nr_reserved_tags) {
480 seq_puts(m, "\nbreserved_tags:\n");
481 sbitmap_queue_show(&tags->breserved_tags, m);
485 static int hctx_tags_show(void *data, struct seq_file *m)
487 struct blk_mq_hw_ctx *hctx = data;
488 struct request_queue *q = hctx->queue;
491 res = mutex_lock_interruptible(&q->sysfs_lock);
495 blk_mq_debugfs_tags_show(m, hctx->tags);
496 mutex_unlock(&q->sysfs_lock);
502 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
504 struct blk_mq_hw_ctx *hctx = data;
505 struct request_queue *q = hctx->queue;
508 res = mutex_lock_interruptible(&q->sysfs_lock);
512 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
513 mutex_unlock(&q->sysfs_lock);
519 static int hctx_sched_tags_show(void *data, struct seq_file *m)
521 struct blk_mq_hw_ctx *hctx = data;
522 struct request_queue *q = hctx->queue;
525 res = mutex_lock_interruptible(&q->sysfs_lock);
528 if (hctx->sched_tags)
529 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
530 mutex_unlock(&q->sysfs_lock);
536 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
538 struct blk_mq_hw_ctx *hctx = data;
539 struct request_queue *q = hctx->queue;
542 res = mutex_lock_interruptible(&q->sysfs_lock);
545 if (hctx->sched_tags)
546 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
547 mutex_unlock(&q->sysfs_lock);
553 static int hctx_io_poll_show(void *data, struct seq_file *m)
555 struct blk_mq_hw_ctx *hctx = data;
557 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
558 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
559 seq_printf(m, "success=%lu\n", hctx->poll_success);
563 static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
564 size_t count, loff_t *ppos)
566 struct blk_mq_hw_ctx *hctx = data;
568 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
572 static int hctx_dispatched_show(void *data, struct seq_file *m)
574 struct blk_mq_hw_ctx *hctx = data;
577 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
579 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
580 unsigned int d = 1U << (i - 1);
582 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
585 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
589 static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
590 size_t count, loff_t *ppos)
592 struct blk_mq_hw_ctx *hctx = data;
595 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
596 hctx->dispatched[i] = 0;
600 static int hctx_queued_show(void *data, struct seq_file *m)
602 struct blk_mq_hw_ctx *hctx = data;
604 seq_printf(m, "%lu\n", hctx->queued);
608 static ssize_t hctx_queued_write(void *data, const char __user *buf,
609 size_t count, loff_t *ppos)
611 struct blk_mq_hw_ctx *hctx = data;
617 static int hctx_run_show(void *data, struct seq_file *m)
619 struct blk_mq_hw_ctx *hctx = data;
621 seq_printf(m, "%lu\n", hctx->run);
625 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
628 struct blk_mq_hw_ctx *hctx = data;
634 static int hctx_active_show(void *data, struct seq_file *m)
636 struct blk_mq_hw_ctx *hctx = data;
638 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
642 static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
643 __acquires(&ctx->lock)
645 struct blk_mq_ctx *ctx = m->private;
647 spin_lock(&ctx->lock);
648 return seq_list_start(&ctx->rq_list, *pos);
651 static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
653 struct blk_mq_ctx *ctx = m->private;
655 return seq_list_next(v, &ctx->rq_list, pos);
658 static void ctx_rq_list_stop(struct seq_file *m, void *v)
659 __releases(&ctx->lock)
661 struct blk_mq_ctx *ctx = m->private;
663 spin_unlock(&ctx->lock);
666 static const struct seq_operations ctx_rq_list_seq_ops = {
667 .start = ctx_rq_list_start,
668 .next = ctx_rq_list_next,
669 .stop = ctx_rq_list_stop,
670 .show = blk_mq_debugfs_rq_show,
672 static int ctx_dispatched_show(void *data, struct seq_file *m)
674 struct blk_mq_ctx *ctx = data;
676 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
680 static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
681 size_t count, loff_t *ppos)
683 struct blk_mq_ctx *ctx = data;
685 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
689 static int ctx_merged_show(void *data, struct seq_file *m)
691 struct blk_mq_ctx *ctx = data;
693 seq_printf(m, "%lu\n", ctx->rq_merged);
697 static ssize_t ctx_merged_write(void *data, const char __user *buf,
698 size_t count, loff_t *ppos)
700 struct blk_mq_ctx *ctx = data;
706 static int ctx_completed_show(void *data, struct seq_file *m)
708 struct blk_mq_ctx *ctx = data;
710 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
714 static ssize_t ctx_completed_write(void *data, const char __user *buf,
715 size_t count, loff_t *ppos)
717 struct blk_mq_ctx *ctx = data;
719 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
723 static int blk_mq_debugfs_show(struct seq_file *m, void *v)
725 const struct blk_mq_debugfs_attr *attr = m->private;
726 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
728 return attr->show(data, m);
731 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
732 size_t count, loff_t *ppos)
734 struct seq_file *m = file->private_data;
735 const struct blk_mq_debugfs_attr *attr = m->private;
736 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
739 * Attributes that only implement .seq_ops are read-only and 'attr' is
740 * the same with 'data' in this case.
742 if (attr == data || !attr->write)
745 return attr->write(data, buf, count, ppos);
748 static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
750 const struct blk_mq_debugfs_attr *attr = inode->i_private;
751 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
756 ret = seq_open(file, attr->seq_ops);
758 m = file->private_data;
764 if (WARN_ON_ONCE(!attr->show))
767 return single_open(file, blk_mq_debugfs_show, inode->i_private);
770 static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
772 const struct blk_mq_debugfs_attr *attr = inode->i_private;
775 return single_release(inode, file);
777 return seq_release(inode, file);
780 static const struct file_operations blk_mq_debugfs_fops = {
781 .open = blk_mq_debugfs_open,
783 .write = blk_mq_debugfs_write,
785 .release = blk_mq_debugfs_release,
788 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
789 {"state", 0400, hctx_state_show},
790 {"flags", 0400, hctx_flags_show},
791 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
792 {"busy", 0400, hctx_busy_show},
793 {"ctx_map", 0400, hctx_ctx_map_show},
794 {"tags", 0400, hctx_tags_show},
795 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
796 {"sched_tags", 0400, hctx_sched_tags_show},
797 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
798 {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
799 {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
800 {"queued", 0600, hctx_queued_show, hctx_queued_write},
801 {"run", 0600, hctx_run_show, hctx_run_write},
802 {"active", 0400, hctx_active_show},
806 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
807 {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops},
808 {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
809 {"merged", 0600, ctx_merged_show, ctx_merged_write},
810 {"completed", 0600, ctx_completed_show, ctx_completed_write},
814 static bool debugfs_create_files(struct dentry *parent, void *data,
815 const struct blk_mq_debugfs_attr *attr)
817 d_inode(parent)->i_private = data;
819 for (; attr->name; attr++) {
820 if (!debugfs_create_file(attr->name, attr->mode, parent,
821 (void *)attr, &blk_mq_debugfs_fops))
827 int blk_mq_debugfs_register(struct request_queue *q)
829 struct blk_mq_hw_ctx *hctx;
832 if (!blk_debugfs_root)
835 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
840 if (!debugfs_create_files(q->debugfs_dir, q,
841 blk_mq_debugfs_queue_attrs))
845 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
846 * didn't exist yet (because we don't know what to name the directory
847 * until the queue is registered to a gendisk).
849 if (q->elevator && !q->sched_debugfs_dir)
850 blk_mq_debugfs_register_sched(q);
852 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
853 queue_for_each_hw_ctx(q, hctx, i) {
854 if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
856 if (q->elevator && !hctx->sched_debugfs_dir &&
857 blk_mq_debugfs_register_sched_hctx(q, hctx))
864 blk_mq_debugfs_unregister(q);
868 void blk_mq_debugfs_unregister(struct request_queue *q)
870 debugfs_remove_recursive(q->debugfs_dir);
871 q->sched_debugfs_dir = NULL;
872 q->debugfs_dir = NULL;
875 static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
876 struct blk_mq_ctx *ctx)
878 struct dentry *ctx_dir;
881 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
882 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
886 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
892 int blk_mq_debugfs_register_hctx(struct request_queue *q,
893 struct blk_mq_hw_ctx *hctx)
895 struct blk_mq_ctx *ctx;
902 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
903 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
904 if (!hctx->debugfs_dir)
907 if (!debugfs_create_files(hctx->debugfs_dir, hctx,
908 blk_mq_debugfs_hctx_attrs))
911 hctx_for_each_ctx(hctx, ctx, i) {
912 if (blk_mq_debugfs_register_ctx(hctx, ctx))
919 blk_mq_debugfs_unregister_hctx(hctx);
923 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
925 debugfs_remove_recursive(hctx->debugfs_dir);
926 hctx->sched_debugfs_dir = NULL;
927 hctx->debugfs_dir = NULL;
930 int blk_mq_debugfs_register_hctxs(struct request_queue *q)
932 struct blk_mq_hw_ctx *hctx;
935 queue_for_each_hw_ctx(q, hctx, i) {
936 if (blk_mq_debugfs_register_hctx(q, hctx))
943 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
945 struct blk_mq_hw_ctx *hctx;
948 queue_for_each_hw_ctx(q, hctx, i)
949 blk_mq_debugfs_unregister_hctx(hctx);
952 int blk_mq_debugfs_register_sched(struct request_queue *q)
954 struct elevator_type *e = q->elevator->type;
959 if (!e->queue_debugfs_attrs)
962 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
963 if (!q->sched_debugfs_dir)
966 if (!debugfs_create_files(q->sched_debugfs_dir, q,
967 e->queue_debugfs_attrs))
973 blk_mq_debugfs_unregister_sched(q);
977 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
979 debugfs_remove_recursive(q->sched_debugfs_dir);
980 q->sched_debugfs_dir = NULL;
983 int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
984 struct blk_mq_hw_ctx *hctx)
986 struct elevator_type *e = q->elevator->type;
988 if (!hctx->debugfs_dir)
991 if (!e->hctx_debugfs_attrs)
994 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
996 if (!hctx->sched_debugfs_dir)
999 if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx,
1000 e->hctx_debugfs_attrs))
1006 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
1008 debugfs_remove_recursive(hctx->sched_debugfs_dir);
1009 hctx->sched_debugfs_dir = NULL;