2 * Copyright (C) 2017 Facebook
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <https://www.gnu.org/licenses/>.
17 #include <linux/kernel.h>
18 #include <linux/blkdev.h>
19 #include <linux/debugfs.h>
21 #include <linux/blk-mq.h>
24 #include "blk-mq-tag.h"
26 struct blk_mq_debugfs_attr
{
29 const struct file_operations
*fops
;
32 static int blk_mq_debugfs_seq_open(struct inode
*inode
, struct file
*file
,
33 const struct seq_operations
*ops
)
38 ret
= seq_open(file
, ops
);
40 m
= file
->private_data
;
41 m
->private = inode
->i_private
;
46 static int blk_flags_show(struct seq_file
*m
, const unsigned long flags
,
47 const char *const *flag_name
, int flag_name_count
)
52 for (i
= 0; i
< sizeof(flags
) * BITS_PER_BYTE
; i
++) {
53 if (!(flags
& BIT(i
)))
58 if (i
< flag_name_count
&& flag_name
[i
])
59 seq_puts(m
, flag_name
[i
]);
61 seq_printf(m
, "%d", i
);
67 static const char *const blk_queue_flag_name
[] = {
68 [QUEUE_FLAG_QUEUED
] = "QUEUED",
69 [QUEUE_FLAG_STOPPED
] = "STOPPED",
70 [QUEUE_FLAG_SYNCFULL
] = "SYNCFULL",
71 [QUEUE_FLAG_ASYNCFULL
] = "ASYNCFULL",
72 [QUEUE_FLAG_DYING
] = "DYING",
73 [QUEUE_FLAG_BYPASS
] = "BYPASS",
74 [QUEUE_FLAG_BIDI
] = "BIDI",
75 [QUEUE_FLAG_NOMERGES
] = "NOMERGES",
76 [QUEUE_FLAG_SAME_COMP
] = "SAME_COMP",
77 [QUEUE_FLAG_FAIL_IO
] = "FAIL_IO",
78 [QUEUE_FLAG_STACKABLE
] = "STACKABLE",
79 [QUEUE_FLAG_NONROT
] = "NONROT",
80 [QUEUE_FLAG_IO_STAT
] = "IO_STAT",
81 [QUEUE_FLAG_DISCARD
] = "DISCARD",
82 [QUEUE_FLAG_NOXMERGES
] = "NOXMERGES",
83 [QUEUE_FLAG_ADD_RANDOM
] = "ADD_RANDOM",
84 [QUEUE_FLAG_SECERASE
] = "SECERASE",
85 [QUEUE_FLAG_SAME_FORCE
] = "SAME_FORCE",
86 [QUEUE_FLAG_DEAD
] = "DEAD",
87 [QUEUE_FLAG_INIT_DONE
] = "INIT_DONE",
88 [QUEUE_FLAG_NO_SG_MERGE
] = "NO_SG_MERGE",
89 [QUEUE_FLAG_POLL
] = "POLL",
90 [QUEUE_FLAG_WC
] = "WC",
91 [QUEUE_FLAG_FUA
] = "FUA",
92 [QUEUE_FLAG_FLUSH_NQ
] = "FLUSH_NQ",
93 [QUEUE_FLAG_DAX
] = "DAX",
94 [QUEUE_FLAG_STATS
] = "STATS",
95 [QUEUE_FLAG_POLL_STATS
] = "POLL_STATS",
96 [QUEUE_FLAG_REGISTERED
] = "REGISTERED",
99 static int blk_queue_flags_show(struct seq_file
*m
, void *v
)
101 struct request_queue
*q
= m
->private;
103 blk_flags_show(m
, q
->queue_flags
, blk_queue_flag_name
,
104 ARRAY_SIZE(blk_queue_flag_name
));
108 static ssize_t
blk_queue_flags_store(struct file
*file
, const char __user
*ubuf
,
109 size_t len
, loff_t
*offp
)
111 struct request_queue
*q
= file_inode(file
)->i_private
;
112 char op
[16] = { }, *s
;
114 len
= min(len
, sizeof(op
) - 1);
115 if (copy_from_user(op
, ubuf
, len
))
118 strsep(&s
, " \t\n"); /* strip trailing whitespace */
119 if (strcmp(op
, "run") == 0) {
120 blk_mq_run_hw_queues(q
, true);
121 } else if (strcmp(op
, "start") == 0) {
122 blk_mq_start_stopped_hw_queues(q
, true);
124 pr_err("%s: unsupported operation %s. Use either 'run' or 'start'\n",
131 static int blk_queue_flags_open(struct inode
*inode
, struct file
*file
)
133 return single_open(file
, blk_queue_flags_show
, inode
->i_private
);
136 static const struct file_operations blk_queue_flags_fops
= {
137 .open
= blk_queue_flags_open
,
140 .release
= single_release
,
141 .write
= blk_queue_flags_store
,
144 static void print_stat(struct seq_file
*m
, struct blk_rq_stat
*stat
)
146 if (stat
->nr_samples
) {
147 seq_printf(m
, "samples=%d, mean=%lld, min=%llu, max=%llu",
148 stat
->nr_samples
, stat
->mean
, stat
->min
, stat
->max
);
150 seq_puts(m
, "samples=0");
154 static int queue_poll_stat_show(struct seq_file
*m
, void *v
)
156 struct request_queue
*q
= m
->private;
159 for (bucket
= 0; bucket
< BLK_MQ_POLL_STATS_BKTS
/2; bucket
++) {
160 seq_printf(m
, "read (%d Bytes): ", 1 << (9+bucket
));
161 print_stat(m
, &q
->poll_stat
[2*bucket
]);
164 seq_printf(m
, "write (%d Bytes): ", 1 << (9+bucket
));
165 print_stat(m
, &q
->poll_stat
[2*bucket
+1]);
171 static int queue_poll_stat_open(struct inode
*inode
, struct file
*file
)
173 return single_open(file
, queue_poll_stat_show
, inode
->i_private
);
176 static const struct file_operations queue_poll_stat_fops
= {
177 .open
= queue_poll_stat_open
,
180 .release
= single_release
,
183 static const char *const hctx_state_name
[] = {
184 [BLK_MQ_S_STOPPED
] = "STOPPED",
185 [BLK_MQ_S_TAG_ACTIVE
] = "TAG_ACTIVE",
186 [BLK_MQ_S_SCHED_RESTART
] = "SCHED_RESTART",
187 [BLK_MQ_S_TAG_WAITING
] = "TAG_WAITING",
190 static int hctx_state_show(struct seq_file
*m
, void *v
)
192 struct blk_mq_hw_ctx
*hctx
= m
->private;
194 blk_flags_show(m
, hctx
->state
, hctx_state_name
,
195 ARRAY_SIZE(hctx_state_name
));
199 static int hctx_state_open(struct inode
*inode
, struct file
*file
)
201 return single_open(file
, hctx_state_show
, inode
->i_private
);
204 static const struct file_operations hctx_state_fops
= {
205 .open
= hctx_state_open
,
208 .release
= single_release
,
211 static const char *const alloc_policy_name
[] = {
212 [BLK_TAG_ALLOC_FIFO
] = "fifo",
213 [BLK_TAG_ALLOC_RR
] = "rr",
216 static const char *const hctx_flag_name
[] = {
217 [ilog2(BLK_MQ_F_SHOULD_MERGE
)] = "SHOULD_MERGE",
218 [ilog2(BLK_MQ_F_TAG_SHARED
)] = "TAG_SHARED",
219 [ilog2(BLK_MQ_F_SG_MERGE
)] = "SG_MERGE",
220 [ilog2(BLK_MQ_F_BLOCKING
)] = "BLOCKING",
221 [ilog2(BLK_MQ_F_NO_SCHED
)] = "NO_SCHED",
224 static int hctx_flags_show(struct seq_file
*m
, void *v
)
226 struct blk_mq_hw_ctx
*hctx
= m
->private;
227 const int alloc_policy
= BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx
->flags
);
229 seq_puts(m
, "alloc_policy=");
230 if (alloc_policy
< ARRAY_SIZE(alloc_policy_name
) &&
231 alloc_policy_name
[alloc_policy
])
232 seq_puts(m
, alloc_policy_name
[alloc_policy
]);
234 seq_printf(m
, "%d", alloc_policy
);
237 hctx
->flags
^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy
),
238 hctx_flag_name
, ARRAY_SIZE(hctx_flag_name
));
242 static int hctx_flags_open(struct inode
*inode
, struct file
*file
)
244 return single_open(file
, hctx_flags_show
, inode
->i_private
);
247 static const struct file_operations hctx_flags_fops
= {
248 .open
= hctx_flags_open
,
251 .release
= single_release
,
254 static int blk_mq_debugfs_rq_show(struct seq_file
*m
, void *v
)
256 struct request
*rq
= list_entry_rq(v
);
258 seq_printf(m
, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n",
259 rq
, rq
->cmd_flags
, (__force
unsigned int)rq
->rq_flags
,
260 rq
->tag
, rq
->internal_tag
);
264 static void *hctx_dispatch_start(struct seq_file
*m
, loff_t
*pos
)
265 __acquires(&hctx
->lock
)
267 struct blk_mq_hw_ctx
*hctx
= m
->private;
269 spin_lock(&hctx
->lock
);
270 return seq_list_start(&hctx
->dispatch
, *pos
);
273 static void *hctx_dispatch_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
275 struct blk_mq_hw_ctx
*hctx
= m
->private;
277 return seq_list_next(v
, &hctx
->dispatch
, pos
);
280 static void hctx_dispatch_stop(struct seq_file
*m
, void *v
)
281 __releases(&hctx
->lock
)
283 struct blk_mq_hw_ctx
*hctx
= m
->private;
285 spin_unlock(&hctx
->lock
);
288 static const struct seq_operations hctx_dispatch_seq_ops
= {
289 .start
= hctx_dispatch_start
,
290 .next
= hctx_dispatch_next
,
291 .stop
= hctx_dispatch_stop
,
292 .show
= blk_mq_debugfs_rq_show
,
295 static int hctx_dispatch_open(struct inode
*inode
, struct file
*file
)
297 return blk_mq_debugfs_seq_open(inode
, file
, &hctx_dispatch_seq_ops
);
300 static const struct file_operations hctx_dispatch_fops
= {
301 .open
= hctx_dispatch_open
,
304 .release
= seq_release
,
307 static int hctx_ctx_map_show(struct seq_file
*m
, void *v
)
309 struct blk_mq_hw_ctx
*hctx
= m
->private;
311 sbitmap_bitmap_show(&hctx
->ctx_map
, m
);
315 static int hctx_ctx_map_open(struct inode
*inode
, struct file
*file
)
317 return single_open(file
, hctx_ctx_map_show
, inode
->i_private
);
320 static const struct file_operations hctx_ctx_map_fops
= {
321 .open
= hctx_ctx_map_open
,
324 .release
= single_release
,
327 static void blk_mq_debugfs_tags_show(struct seq_file
*m
,
328 struct blk_mq_tags
*tags
)
330 seq_printf(m
, "nr_tags=%u\n", tags
->nr_tags
);
331 seq_printf(m
, "nr_reserved_tags=%u\n", tags
->nr_reserved_tags
);
332 seq_printf(m
, "active_queues=%d\n",
333 atomic_read(&tags
->active_queues
));
335 seq_puts(m
, "\nbitmap_tags:\n");
336 sbitmap_queue_show(&tags
->bitmap_tags
, m
);
338 if (tags
->nr_reserved_tags
) {
339 seq_puts(m
, "\nbreserved_tags:\n");
340 sbitmap_queue_show(&tags
->breserved_tags
, m
);
344 static int hctx_tags_show(struct seq_file
*m
, void *v
)
346 struct blk_mq_hw_ctx
*hctx
= m
->private;
347 struct request_queue
*q
= hctx
->queue
;
350 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
354 blk_mq_debugfs_tags_show(m
, hctx
->tags
);
355 mutex_unlock(&q
->sysfs_lock
);
361 static int hctx_tags_open(struct inode
*inode
, struct file
*file
)
363 return single_open(file
, hctx_tags_show
, inode
->i_private
);
366 static const struct file_operations hctx_tags_fops
= {
367 .open
= hctx_tags_open
,
370 .release
= single_release
,
373 static int hctx_tags_bitmap_show(struct seq_file
*m
, void *v
)
375 struct blk_mq_hw_ctx
*hctx
= m
->private;
376 struct request_queue
*q
= hctx
->queue
;
379 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
383 sbitmap_bitmap_show(&hctx
->tags
->bitmap_tags
.sb
, m
);
384 mutex_unlock(&q
->sysfs_lock
);
390 static int hctx_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
392 return single_open(file
, hctx_tags_bitmap_show
, inode
->i_private
);
395 static const struct file_operations hctx_tags_bitmap_fops
= {
396 .open
= hctx_tags_bitmap_open
,
399 .release
= single_release
,
402 static int hctx_sched_tags_show(struct seq_file
*m
, void *v
)
404 struct blk_mq_hw_ctx
*hctx
= m
->private;
405 struct request_queue
*q
= hctx
->queue
;
408 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
411 if (hctx
->sched_tags
)
412 blk_mq_debugfs_tags_show(m
, hctx
->sched_tags
);
413 mutex_unlock(&q
->sysfs_lock
);
419 static int hctx_sched_tags_open(struct inode
*inode
, struct file
*file
)
421 return single_open(file
, hctx_sched_tags_show
, inode
->i_private
);
424 static const struct file_operations hctx_sched_tags_fops
= {
425 .open
= hctx_sched_tags_open
,
428 .release
= single_release
,
431 static int hctx_sched_tags_bitmap_show(struct seq_file
*m
, void *v
)
433 struct blk_mq_hw_ctx
*hctx
= m
->private;
434 struct request_queue
*q
= hctx
->queue
;
437 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
440 if (hctx
->sched_tags
)
441 sbitmap_bitmap_show(&hctx
->sched_tags
->bitmap_tags
.sb
, m
);
442 mutex_unlock(&q
->sysfs_lock
);
448 static int hctx_sched_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
450 return single_open(file
, hctx_sched_tags_bitmap_show
, inode
->i_private
);
453 static const struct file_operations hctx_sched_tags_bitmap_fops
= {
454 .open
= hctx_sched_tags_bitmap_open
,
457 .release
= single_release
,
460 static int hctx_io_poll_show(struct seq_file
*m
, void *v
)
462 struct blk_mq_hw_ctx
*hctx
= m
->private;
464 seq_printf(m
, "considered=%lu\n", hctx
->poll_considered
);
465 seq_printf(m
, "invoked=%lu\n", hctx
->poll_invoked
);
466 seq_printf(m
, "success=%lu\n", hctx
->poll_success
);
470 static int hctx_io_poll_open(struct inode
*inode
, struct file
*file
)
472 return single_open(file
, hctx_io_poll_show
, inode
->i_private
);
475 static ssize_t
hctx_io_poll_write(struct file
*file
, const char __user
*buf
,
476 size_t count
, loff_t
*ppos
)
478 struct seq_file
*m
= file
->private_data
;
479 struct blk_mq_hw_ctx
*hctx
= m
->private;
481 hctx
->poll_considered
= hctx
->poll_invoked
= hctx
->poll_success
= 0;
485 static const struct file_operations hctx_io_poll_fops
= {
486 .open
= hctx_io_poll_open
,
488 .write
= hctx_io_poll_write
,
490 .release
= single_release
,
493 static int hctx_dispatched_show(struct seq_file
*m
, void *v
)
495 struct blk_mq_hw_ctx
*hctx
= m
->private;
498 seq_printf(m
, "%8u\t%lu\n", 0U, hctx
->dispatched
[0]);
500 for (i
= 1; i
< BLK_MQ_MAX_DISPATCH_ORDER
- 1; i
++) {
501 unsigned int d
= 1U << (i
- 1);
503 seq_printf(m
, "%8u\t%lu\n", d
, hctx
->dispatched
[i
]);
506 seq_printf(m
, "%8u+\t%lu\n", 1U << (i
- 1), hctx
->dispatched
[i
]);
510 static int hctx_dispatched_open(struct inode
*inode
, struct file
*file
)
512 return single_open(file
, hctx_dispatched_show
, inode
->i_private
);
515 static ssize_t
hctx_dispatched_write(struct file
*file
, const char __user
*buf
,
516 size_t count
, loff_t
*ppos
)
518 struct seq_file
*m
= file
->private_data
;
519 struct blk_mq_hw_ctx
*hctx
= m
->private;
522 for (i
= 0; i
< BLK_MQ_MAX_DISPATCH_ORDER
; i
++)
523 hctx
->dispatched
[i
] = 0;
527 static const struct file_operations hctx_dispatched_fops
= {
528 .open
= hctx_dispatched_open
,
530 .write
= hctx_dispatched_write
,
532 .release
= single_release
,
535 static int hctx_queued_show(struct seq_file
*m
, void *v
)
537 struct blk_mq_hw_ctx
*hctx
= m
->private;
539 seq_printf(m
, "%lu\n", hctx
->queued
);
543 static int hctx_queued_open(struct inode
*inode
, struct file
*file
)
545 return single_open(file
, hctx_queued_show
, inode
->i_private
);
548 static ssize_t
hctx_queued_write(struct file
*file
, const char __user
*buf
,
549 size_t count
, loff_t
*ppos
)
551 struct seq_file
*m
= file
->private_data
;
552 struct blk_mq_hw_ctx
*hctx
= m
->private;
558 static const struct file_operations hctx_queued_fops
= {
559 .open
= hctx_queued_open
,
561 .write
= hctx_queued_write
,
563 .release
= single_release
,
566 static int hctx_run_show(struct seq_file
*m
, void *v
)
568 struct blk_mq_hw_ctx
*hctx
= m
->private;
570 seq_printf(m
, "%lu\n", hctx
->run
);
574 static int hctx_run_open(struct inode
*inode
, struct file
*file
)
576 return single_open(file
, hctx_run_show
, inode
->i_private
);
579 static ssize_t
hctx_run_write(struct file
*file
, const char __user
*buf
,
580 size_t count
, loff_t
*ppos
)
582 struct seq_file
*m
= file
->private_data
;
583 struct blk_mq_hw_ctx
*hctx
= m
->private;
589 static const struct file_operations hctx_run_fops
= {
590 .open
= hctx_run_open
,
592 .write
= hctx_run_write
,
594 .release
= single_release
,
597 static int hctx_active_show(struct seq_file
*m
, void *v
)
599 struct blk_mq_hw_ctx
*hctx
= m
->private;
601 seq_printf(m
, "%d\n", atomic_read(&hctx
->nr_active
));
605 static int hctx_active_open(struct inode
*inode
, struct file
*file
)
607 return single_open(file
, hctx_active_show
, inode
->i_private
);
610 static const struct file_operations hctx_active_fops
= {
611 .open
= hctx_active_open
,
614 .release
= single_release
,
617 static void *ctx_rq_list_start(struct seq_file
*m
, loff_t
*pos
)
618 __acquires(&ctx
->lock
)
620 struct blk_mq_ctx
*ctx
= m
->private;
622 spin_lock(&ctx
->lock
);
623 return seq_list_start(&ctx
->rq_list
, *pos
);
626 static void *ctx_rq_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
628 struct blk_mq_ctx
*ctx
= m
->private;
630 return seq_list_next(v
, &ctx
->rq_list
, pos
);
633 static void ctx_rq_list_stop(struct seq_file
*m
, void *v
)
634 __releases(&ctx
->lock
)
636 struct blk_mq_ctx
*ctx
= m
->private;
638 spin_unlock(&ctx
->lock
);
641 static const struct seq_operations ctx_rq_list_seq_ops
= {
642 .start
= ctx_rq_list_start
,
643 .next
= ctx_rq_list_next
,
644 .stop
= ctx_rq_list_stop
,
645 .show
= blk_mq_debugfs_rq_show
,
648 static int ctx_rq_list_open(struct inode
*inode
, struct file
*file
)
650 return blk_mq_debugfs_seq_open(inode
, file
, &ctx_rq_list_seq_ops
);
653 static const struct file_operations ctx_rq_list_fops
= {
654 .open
= ctx_rq_list_open
,
657 .release
= seq_release
,
660 static int ctx_dispatched_show(struct seq_file
*m
, void *v
)
662 struct blk_mq_ctx
*ctx
= m
->private;
664 seq_printf(m
, "%lu %lu\n", ctx
->rq_dispatched
[1], ctx
->rq_dispatched
[0]);
668 static int ctx_dispatched_open(struct inode
*inode
, struct file
*file
)
670 return single_open(file
, ctx_dispatched_show
, inode
->i_private
);
673 static ssize_t
ctx_dispatched_write(struct file
*file
, const char __user
*buf
,
674 size_t count
, loff_t
*ppos
)
676 struct seq_file
*m
= file
->private_data
;
677 struct blk_mq_ctx
*ctx
= m
->private;
679 ctx
->rq_dispatched
[0] = ctx
->rq_dispatched
[1] = 0;
683 static const struct file_operations ctx_dispatched_fops
= {
684 .open
= ctx_dispatched_open
,
686 .write
= ctx_dispatched_write
,
688 .release
= single_release
,
691 static int ctx_merged_show(struct seq_file
*m
, void *v
)
693 struct blk_mq_ctx
*ctx
= m
->private;
695 seq_printf(m
, "%lu\n", ctx
->rq_merged
);
699 static int ctx_merged_open(struct inode
*inode
, struct file
*file
)
701 return single_open(file
, ctx_merged_show
, inode
->i_private
);
704 static ssize_t
ctx_merged_write(struct file
*file
, const char __user
*buf
,
705 size_t count
, loff_t
*ppos
)
707 struct seq_file
*m
= file
->private_data
;
708 struct blk_mq_ctx
*ctx
= m
->private;
714 static const struct file_operations ctx_merged_fops
= {
715 .open
= ctx_merged_open
,
717 .write
= ctx_merged_write
,
719 .release
= single_release
,
722 static int ctx_completed_show(struct seq_file
*m
, void *v
)
724 struct blk_mq_ctx
*ctx
= m
->private;
726 seq_printf(m
, "%lu %lu\n", ctx
->rq_completed
[1], ctx
->rq_completed
[0]);
730 static int ctx_completed_open(struct inode
*inode
, struct file
*file
)
732 return single_open(file
, ctx_completed_show
, inode
->i_private
);
735 static ssize_t
ctx_completed_write(struct file
*file
, const char __user
*buf
,
736 size_t count
, loff_t
*ppos
)
738 struct seq_file
*m
= file
->private_data
;
739 struct blk_mq_ctx
*ctx
= m
->private;
741 ctx
->rq_completed
[0] = ctx
->rq_completed
[1] = 0;
745 static const struct file_operations ctx_completed_fops
= {
746 .open
= ctx_completed_open
,
748 .write
= ctx_completed_write
,
750 .release
= single_release
,
753 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs
[] = {
754 {"poll_stat", 0400, &queue_poll_stat_fops
},
755 {"state", 0600, &blk_queue_flags_fops
},
759 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs
[] = {
760 {"state", 0400, &hctx_state_fops
},
761 {"flags", 0400, &hctx_flags_fops
},
762 {"dispatch", 0400, &hctx_dispatch_fops
},
763 {"ctx_map", 0400, &hctx_ctx_map_fops
},
764 {"tags", 0400, &hctx_tags_fops
},
765 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops
},
766 {"sched_tags", 0400, &hctx_sched_tags_fops
},
767 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops
},
768 {"io_poll", 0600, &hctx_io_poll_fops
},
769 {"dispatched", 0600, &hctx_dispatched_fops
},
770 {"queued", 0600, &hctx_queued_fops
},
771 {"run", 0600, &hctx_run_fops
},
772 {"active", 0400, &hctx_active_fops
},
776 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs
[] = {
777 {"rq_list", 0400, &ctx_rq_list_fops
},
778 {"dispatched", 0600, &ctx_dispatched_fops
},
779 {"merged", 0600, &ctx_merged_fops
},
780 {"completed", 0600, &ctx_completed_fops
},
784 int blk_mq_debugfs_register(struct request_queue
*q
)
786 if (!blk_debugfs_root
)
789 q
->debugfs_dir
= debugfs_create_dir(kobject_name(q
->kobj
.parent
),
794 if (blk_mq_debugfs_register_mq(q
))
800 blk_mq_debugfs_unregister(q
);
804 void blk_mq_debugfs_unregister(struct request_queue
*q
)
806 debugfs_remove_recursive(q
->debugfs_dir
);
807 q
->mq_debugfs_dir
= NULL
;
808 q
->debugfs_dir
= NULL
;
811 static bool debugfs_create_files(struct dentry
*parent
, void *data
,
812 const struct blk_mq_debugfs_attr
*attr
)
814 for (; attr
->name
; attr
++) {
815 if (!debugfs_create_file(attr
->name
, attr
->mode
, parent
,
822 static int blk_mq_debugfs_register_ctx(struct request_queue
*q
,
823 struct blk_mq_ctx
*ctx
,
824 struct dentry
*hctx_dir
)
826 struct dentry
*ctx_dir
;
829 snprintf(name
, sizeof(name
), "cpu%u", ctx
->cpu
);
830 ctx_dir
= debugfs_create_dir(name
, hctx_dir
);
834 if (!debugfs_create_files(ctx_dir
, ctx
, blk_mq_debugfs_ctx_attrs
))
840 static int blk_mq_debugfs_register_hctx(struct request_queue
*q
,
841 struct blk_mq_hw_ctx
*hctx
)
843 struct blk_mq_ctx
*ctx
;
844 struct dentry
*hctx_dir
;
848 snprintf(name
, sizeof(name
), "%u", hctx
->queue_num
);
849 hctx_dir
= debugfs_create_dir(name
, q
->mq_debugfs_dir
);
853 if (!debugfs_create_files(hctx_dir
, hctx
, blk_mq_debugfs_hctx_attrs
))
856 hctx_for_each_ctx(hctx
, ctx
, i
) {
857 if (blk_mq_debugfs_register_ctx(q
, ctx
, hctx_dir
))
864 int blk_mq_debugfs_register_mq(struct request_queue
*q
)
866 struct blk_mq_hw_ctx
*hctx
;
872 q
->mq_debugfs_dir
= debugfs_create_dir("mq", q
->debugfs_dir
);
873 if (!q
->mq_debugfs_dir
)
876 if (!debugfs_create_files(q
->mq_debugfs_dir
, q
, blk_mq_debugfs_queue_attrs
))
879 queue_for_each_hw_ctx(q
, hctx
, i
) {
880 if (blk_mq_debugfs_register_hctx(q
, hctx
))
887 blk_mq_debugfs_unregister_mq(q
);
891 void blk_mq_debugfs_unregister_mq(struct request_queue
*q
)
893 debugfs_remove_recursive(q
->mq_debugfs_dir
);
894 q
->mq_debugfs_dir
= NULL
;