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(STOPPED),
116 QUEUE_FLAG_NAME(DYING),
117 QUEUE_FLAG_NAME(BYPASS),
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.
427 static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
429 const struct show_busy_params *params = data;
431 if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx)
432 __blk_mq_debugfs_rq_show(params->m,
433 list_entry_rq(&rq->queuelist));
436 static int hctx_busy_show(void *data, struct seq_file *m)
438 struct blk_mq_hw_ctx *hctx = data;
439 struct show_busy_params params = { .m = m, .hctx = hctx };
441 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
447 static int hctx_ctx_map_show(void *data, struct seq_file *m)
449 struct blk_mq_hw_ctx *hctx = data;
451 sbitmap_bitmap_show(&hctx->ctx_map, m);
455 static void blk_mq_debugfs_tags_show(struct seq_file *m,
456 struct blk_mq_tags *tags)
458 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
459 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
460 seq_printf(m, "active_queues=%d\n",
461 atomic_read(&tags->active_queues));
463 seq_puts(m, "\nbitmap_tags:\n");
464 sbitmap_queue_show(&tags->bitmap_tags, m);
466 if (tags->nr_reserved_tags) {
467 seq_puts(m, "\nbreserved_tags:\n");
468 sbitmap_queue_show(&tags->breserved_tags, m);
472 static int hctx_tags_show(void *data, struct seq_file *m)
474 struct blk_mq_hw_ctx *hctx = data;
475 struct request_queue *q = hctx->queue;
478 res = mutex_lock_interruptible(&q->sysfs_lock);
482 blk_mq_debugfs_tags_show(m, hctx->tags);
483 mutex_unlock(&q->sysfs_lock);
489 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
491 struct blk_mq_hw_ctx *hctx = data;
492 struct request_queue *q = hctx->queue;
495 res = mutex_lock_interruptible(&q->sysfs_lock);
499 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
500 mutex_unlock(&q->sysfs_lock);
506 static int hctx_sched_tags_show(void *data, struct seq_file *m)
508 struct blk_mq_hw_ctx *hctx = data;
509 struct request_queue *q = hctx->queue;
512 res = mutex_lock_interruptible(&q->sysfs_lock);
515 if (hctx->sched_tags)
516 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
517 mutex_unlock(&q->sysfs_lock);
523 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
525 struct blk_mq_hw_ctx *hctx = data;
526 struct request_queue *q = hctx->queue;
529 res = mutex_lock_interruptible(&q->sysfs_lock);
532 if (hctx->sched_tags)
533 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
534 mutex_unlock(&q->sysfs_lock);
540 static int hctx_io_poll_show(void *data, struct seq_file *m)
542 struct blk_mq_hw_ctx *hctx = data;
544 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
545 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
546 seq_printf(m, "success=%lu\n", hctx->poll_success);
550 static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
551 size_t count, loff_t *ppos)
553 struct blk_mq_hw_ctx *hctx = data;
555 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
559 static int hctx_dispatched_show(void *data, struct seq_file *m)
561 struct blk_mq_hw_ctx *hctx = data;
564 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
566 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
567 unsigned int d = 1U << (i - 1);
569 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
572 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
576 static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
577 size_t count, loff_t *ppos)
579 struct blk_mq_hw_ctx *hctx = data;
582 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
583 hctx->dispatched[i] = 0;
587 static int hctx_queued_show(void *data, struct seq_file *m)
589 struct blk_mq_hw_ctx *hctx = data;
591 seq_printf(m, "%lu\n", hctx->queued);
595 static ssize_t hctx_queued_write(void *data, const char __user *buf,
596 size_t count, loff_t *ppos)
598 struct blk_mq_hw_ctx *hctx = data;
604 static int hctx_run_show(void *data, struct seq_file *m)
606 struct blk_mq_hw_ctx *hctx = data;
608 seq_printf(m, "%lu\n", hctx->run);
612 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
615 struct blk_mq_hw_ctx *hctx = data;
621 static int hctx_active_show(void *data, struct seq_file *m)
623 struct blk_mq_hw_ctx *hctx = data;
625 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
629 static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
631 struct blk_mq_hw_ctx *hctx = data;
633 seq_printf(m, "%u\n", hctx->dispatch_busy);
637 static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
638 __acquires(&ctx->lock)
640 struct blk_mq_ctx *ctx = m->private;
642 spin_lock(&ctx->lock);
643 return seq_list_start(&ctx->rq_list, *pos);
646 static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
648 struct blk_mq_ctx *ctx = m->private;
650 return seq_list_next(v, &ctx->rq_list, pos);
653 static void ctx_rq_list_stop(struct seq_file *m, void *v)
654 __releases(&ctx->lock)
656 struct blk_mq_ctx *ctx = m->private;
658 spin_unlock(&ctx->lock);
661 static const struct seq_operations ctx_rq_list_seq_ops = {
662 .start = ctx_rq_list_start,
663 .next = ctx_rq_list_next,
664 .stop = ctx_rq_list_stop,
665 .show = blk_mq_debugfs_rq_show,
667 static int ctx_dispatched_show(void *data, struct seq_file *m)
669 struct blk_mq_ctx *ctx = data;
671 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
675 static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
676 size_t count, loff_t *ppos)
678 struct blk_mq_ctx *ctx = data;
680 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
684 static int ctx_merged_show(void *data, struct seq_file *m)
686 struct blk_mq_ctx *ctx = data;
688 seq_printf(m, "%lu\n", ctx->rq_merged);
692 static ssize_t ctx_merged_write(void *data, const char __user *buf,
693 size_t count, loff_t *ppos)
695 struct blk_mq_ctx *ctx = data;
701 static int ctx_completed_show(void *data, struct seq_file *m)
703 struct blk_mq_ctx *ctx = data;
705 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
709 static ssize_t ctx_completed_write(void *data, const char __user *buf,
710 size_t count, loff_t *ppos)
712 struct blk_mq_ctx *ctx = data;
714 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
718 static int blk_mq_debugfs_show(struct seq_file *m, void *v)
720 const struct blk_mq_debugfs_attr *attr = m->private;
721 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
723 return attr->show(data, m);
726 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
727 size_t count, loff_t *ppos)
729 struct seq_file *m = file->private_data;
730 const struct blk_mq_debugfs_attr *attr = m->private;
731 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
734 * Attributes that only implement .seq_ops are read-only and 'attr' is
735 * the same with 'data' in this case.
737 if (attr == data || !attr->write)
740 return attr->write(data, buf, count, ppos);
743 static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
745 const struct blk_mq_debugfs_attr *attr = inode->i_private;
746 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
751 ret = seq_open(file, attr->seq_ops);
753 m = file->private_data;
759 if (WARN_ON_ONCE(!attr->show))
762 return single_open(file, blk_mq_debugfs_show, inode->i_private);
765 static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
767 const struct blk_mq_debugfs_attr *attr = inode->i_private;
770 return single_release(inode, file);
772 return seq_release(inode, file);
775 static const struct file_operations blk_mq_debugfs_fops = {
776 .open = blk_mq_debugfs_open,
778 .write = blk_mq_debugfs_write,
780 .release = blk_mq_debugfs_release,
783 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
784 {"state", 0400, hctx_state_show},
785 {"flags", 0400, hctx_flags_show},
786 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
787 {"busy", 0400, hctx_busy_show},
788 {"ctx_map", 0400, hctx_ctx_map_show},
789 {"tags", 0400, hctx_tags_show},
790 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
791 {"sched_tags", 0400, hctx_sched_tags_show},
792 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
793 {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
794 {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
795 {"queued", 0600, hctx_queued_show, hctx_queued_write},
796 {"run", 0600, hctx_run_show, hctx_run_write},
797 {"active", 0400, hctx_active_show},
798 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
802 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
803 {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops},
804 {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
805 {"merged", 0600, ctx_merged_show, ctx_merged_write},
806 {"completed", 0600, ctx_completed_show, ctx_completed_write},
810 static bool debugfs_create_files(struct dentry *parent, void *data,
811 const struct blk_mq_debugfs_attr *attr)
813 d_inode(parent)->i_private = data;
815 for (; attr->name; attr++) {
816 if (!debugfs_create_file(attr->name, attr->mode, parent,
817 (void *)attr, &blk_mq_debugfs_fops))
823 int blk_mq_debugfs_register(struct request_queue *q)
825 struct blk_mq_hw_ctx *hctx;
828 if (!blk_debugfs_root)
831 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
836 if (!debugfs_create_files(q->debugfs_dir, q,
837 blk_mq_debugfs_queue_attrs))
841 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
842 * didn't exist yet (because we don't know what to name the directory
843 * until the queue is registered to a gendisk).
845 if (q->elevator && !q->sched_debugfs_dir)
846 blk_mq_debugfs_register_sched(q);
848 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
849 queue_for_each_hw_ctx(q, hctx, i) {
850 if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
852 if (q->elevator && !hctx->sched_debugfs_dir &&
853 blk_mq_debugfs_register_sched_hctx(q, hctx))
860 blk_mq_debugfs_unregister(q);
864 void blk_mq_debugfs_unregister(struct request_queue *q)
866 debugfs_remove_recursive(q->debugfs_dir);
867 q->sched_debugfs_dir = NULL;
868 q->debugfs_dir = NULL;
871 static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
872 struct blk_mq_ctx *ctx)
874 struct dentry *ctx_dir;
877 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
878 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
882 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
888 int blk_mq_debugfs_register_hctx(struct request_queue *q,
889 struct blk_mq_hw_ctx *hctx)
891 struct blk_mq_ctx *ctx;
898 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
899 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
900 if (!hctx->debugfs_dir)
903 if (!debugfs_create_files(hctx->debugfs_dir, hctx,
904 blk_mq_debugfs_hctx_attrs))
907 hctx_for_each_ctx(hctx, ctx, i) {
908 if (blk_mq_debugfs_register_ctx(hctx, ctx))
915 blk_mq_debugfs_unregister_hctx(hctx);
919 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
921 debugfs_remove_recursive(hctx->debugfs_dir);
922 hctx->sched_debugfs_dir = NULL;
923 hctx->debugfs_dir = NULL;
926 int blk_mq_debugfs_register_hctxs(struct request_queue *q)
928 struct blk_mq_hw_ctx *hctx;
931 queue_for_each_hw_ctx(q, hctx, i) {
932 if (blk_mq_debugfs_register_hctx(q, hctx))
939 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
941 struct blk_mq_hw_ctx *hctx;
944 queue_for_each_hw_ctx(q, hctx, i)
945 blk_mq_debugfs_unregister_hctx(hctx);
948 int blk_mq_debugfs_register_sched(struct request_queue *q)
950 struct elevator_type *e = q->elevator->type;
955 if (!e->queue_debugfs_attrs)
958 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
959 if (!q->sched_debugfs_dir)
962 if (!debugfs_create_files(q->sched_debugfs_dir, q,
963 e->queue_debugfs_attrs))
969 blk_mq_debugfs_unregister_sched(q);
973 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
975 debugfs_remove_recursive(q->sched_debugfs_dir);
976 q->sched_debugfs_dir = NULL;
979 int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
980 struct blk_mq_hw_ctx *hctx)
982 struct elevator_type *e = q->elevator->type;
984 if (!hctx->debugfs_dir)
987 if (!e->hctx_debugfs_attrs)
990 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
992 if (!hctx->sched_debugfs_dir)
995 if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx,
996 e->hctx_debugfs_attrs))
1002 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
1004 debugfs_remove_recursive(hctx->sched_debugfs_dir);
1005 hctx->sched_debugfs_dir = NULL;