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
);
66 static const char *const blk_queue_flag_name
[] = {
67 [QUEUE_FLAG_QUEUED
] = "QUEUED",
68 [QUEUE_FLAG_STOPPED
] = "STOPPED",
69 [QUEUE_FLAG_SYNCFULL
] = "SYNCFULL",
70 [QUEUE_FLAG_ASYNCFULL
] = "ASYNCFULL",
71 [QUEUE_FLAG_DYING
] = "DYING",
72 [QUEUE_FLAG_BYPASS
] = "BYPASS",
73 [QUEUE_FLAG_BIDI
] = "BIDI",
74 [QUEUE_FLAG_NOMERGES
] = "NOMERGES",
75 [QUEUE_FLAG_SAME_COMP
] = "SAME_COMP",
76 [QUEUE_FLAG_FAIL_IO
] = "FAIL_IO",
77 [QUEUE_FLAG_STACKABLE
] = "STACKABLE",
78 [QUEUE_FLAG_NONROT
] = "NONROT",
79 [QUEUE_FLAG_IO_STAT
] = "IO_STAT",
80 [QUEUE_FLAG_DISCARD
] = "DISCARD",
81 [QUEUE_FLAG_NOXMERGES
] = "NOXMERGES",
82 [QUEUE_FLAG_ADD_RANDOM
] = "ADD_RANDOM",
83 [QUEUE_FLAG_SECERASE
] = "SECERASE",
84 [QUEUE_FLAG_SAME_FORCE
] = "SAME_FORCE",
85 [QUEUE_FLAG_DEAD
] = "DEAD",
86 [QUEUE_FLAG_INIT_DONE
] = "INIT_DONE",
87 [QUEUE_FLAG_NO_SG_MERGE
] = "NO_SG_MERGE",
88 [QUEUE_FLAG_POLL
] = "POLL",
89 [QUEUE_FLAG_WC
] = "WC",
90 [QUEUE_FLAG_FUA
] = "FUA",
91 [QUEUE_FLAG_FLUSH_NQ
] = "FLUSH_NQ",
92 [QUEUE_FLAG_DAX
] = "DAX",
93 [QUEUE_FLAG_STATS
] = "STATS",
94 [QUEUE_FLAG_POLL_STATS
] = "POLL_STATS",
95 [QUEUE_FLAG_REGISTERED
] = "REGISTERED",
98 static int blk_queue_flags_show(struct seq_file
*m
, void *v
)
100 struct request_queue
*q
= m
->private;
102 blk_flags_show(m
, q
->queue_flags
, blk_queue_flag_name
,
103 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
));
200 static int hctx_state_open(struct inode
*inode
, struct file
*file
)
202 return single_open(file
, hctx_state_show
, inode
->i_private
);
205 static const struct file_operations hctx_state_fops
= {
206 .open
= hctx_state_open
,
209 .release
= single_release
,
212 static const char *const alloc_policy_name
[] = {
213 [BLK_TAG_ALLOC_FIFO
] = "fifo",
214 [BLK_TAG_ALLOC_RR
] = "rr",
217 static const char *const hctx_flag_name
[] = {
218 [ilog2(BLK_MQ_F_SHOULD_MERGE
)] = "SHOULD_MERGE",
219 [ilog2(BLK_MQ_F_TAG_SHARED
)] = "TAG_SHARED",
220 [ilog2(BLK_MQ_F_SG_MERGE
)] = "SG_MERGE",
221 [ilog2(BLK_MQ_F_BLOCKING
)] = "BLOCKING",
222 [ilog2(BLK_MQ_F_NO_SCHED
)] = "NO_SCHED",
225 static int hctx_flags_show(struct seq_file
*m
, void *v
)
227 struct blk_mq_hw_ctx
*hctx
= m
->private;
228 const int alloc_policy
= BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx
->flags
);
230 seq_puts(m
, "alloc_policy=");
231 if (alloc_policy
< ARRAY_SIZE(alloc_policy_name
) &&
232 alloc_policy_name
[alloc_policy
])
233 seq_puts(m
, alloc_policy_name
[alloc_policy
]);
235 seq_printf(m
, "%d", alloc_policy
);
238 hctx
->flags
^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy
),
239 hctx_flag_name
, ARRAY_SIZE(hctx_flag_name
));
244 static int hctx_flags_open(struct inode
*inode
, struct file
*file
)
246 return single_open(file
, hctx_flags_show
, inode
->i_private
);
249 static const struct file_operations hctx_flags_fops
= {
250 .open
= hctx_flags_open
,
253 .release
= single_release
,
256 static int blk_mq_debugfs_rq_show(struct seq_file
*m
, void *v
)
258 struct request
*rq
= list_entry_rq(v
);
260 seq_printf(m
, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n",
261 rq
, rq
->cmd_flags
, (__force
unsigned int)rq
->rq_flags
,
262 rq
->tag
, rq
->internal_tag
);
266 static void *hctx_dispatch_start(struct seq_file
*m
, loff_t
*pos
)
267 __acquires(&hctx
->lock
)
269 struct blk_mq_hw_ctx
*hctx
= m
->private;
271 spin_lock(&hctx
->lock
);
272 return seq_list_start(&hctx
->dispatch
, *pos
);
275 static void *hctx_dispatch_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
277 struct blk_mq_hw_ctx
*hctx
= m
->private;
279 return seq_list_next(v
, &hctx
->dispatch
, pos
);
282 static void hctx_dispatch_stop(struct seq_file
*m
, void *v
)
283 __releases(&hctx
->lock
)
285 struct blk_mq_hw_ctx
*hctx
= m
->private;
287 spin_unlock(&hctx
->lock
);
290 static const struct seq_operations hctx_dispatch_seq_ops
= {
291 .start
= hctx_dispatch_start
,
292 .next
= hctx_dispatch_next
,
293 .stop
= hctx_dispatch_stop
,
294 .show
= blk_mq_debugfs_rq_show
,
297 static int hctx_dispatch_open(struct inode
*inode
, struct file
*file
)
299 return blk_mq_debugfs_seq_open(inode
, file
, &hctx_dispatch_seq_ops
);
302 static const struct file_operations hctx_dispatch_fops
= {
303 .open
= hctx_dispatch_open
,
306 .release
= seq_release
,
309 static int hctx_ctx_map_show(struct seq_file
*m
, void *v
)
311 struct blk_mq_hw_ctx
*hctx
= m
->private;
313 sbitmap_bitmap_show(&hctx
->ctx_map
, m
);
317 static int hctx_ctx_map_open(struct inode
*inode
, struct file
*file
)
319 return single_open(file
, hctx_ctx_map_show
, inode
->i_private
);
322 static const struct file_operations hctx_ctx_map_fops
= {
323 .open
= hctx_ctx_map_open
,
326 .release
= single_release
,
329 static void blk_mq_debugfs_tags_show(struct seq_file
*m
,
330 struct blk_mq_tags
*tags
)
332 seq_printf(m
, "nr_tags=%u\n", tags
->nr_tags
);
333 seq_printf(m
, "nr_reserved_tags=%u\n", tags
->nr_reserved_tags
);
334 seq_printf(m
, "active_queues=%d\n",
335 atomic_read(&tags
->active_queues
));
337 seq_puts(m
, "\nbitmap_tags:\n");
338 sbitmap_queue_show(&tags
->bitmap_tags
, m
);
340 if (tags
->nr_reserved_tags
) {
341 seq_puts(m
, "\nbreserved_tags:\n");
342 sbitmap_queue_show(&tags
->breserved_tags
, m
);
346 static int hctx_tags_show(struct seq_file
*m
, void *v
)
348 struct blk_mq_hw_ctx
*hctx
= m
->private;
349 struct request_queue
*q
= hctx
->queue
;
352 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
356 blk_mq_debugfs_tags_show(m
, hctx
->tags
);
357 mutex_unlock(&q
->sysfs_lock
);
363 static int hctx_tags_open(struct inode
*inode
, struct file
*file
)
365 return single_open(file
, hctx_tags_show
, inode
->i_private
);
368 static const struct file_operations hctx_tags_fops
= {
369 .open
= hctx_tags_open
,
372 .release
= single_release
,
375 static int hctx_tags_bitmap_show(struct seq_file
*m
, void *v
)
377 struct blk_mq_hw_ctx
*hctx
= m
->private;
378 struct request_queue
*q
= hctx
->queue
;
381 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
385 sbitmap_bitmap_show(&hctx
->tags
->bitmap_tags
.sb
, m
);
386 mutex_unlock(&q
->sysfs_lock
);
392 static int hctx_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
394 return single_open(file
, hctx_tags_bitmap_show
, inode
->i_private
);
397 static const struct file_operations hctx_tags_bitmap_fops
= {
398 .open
= hctx_tags_bitmap_open
,
401 .release
= single_release
,
404 static int hctx_sched_tags_show(struct seq_file
*m
, void *v
)
406 struct blk_mq_hw_ctx
*hctx
= m
->private;
407 struct request_queue
*q
= hctx
->queue
;
410 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
413 if (hctx
->sched_tags
)
414 blk_mq_debugfs_tags_show(m
, hctx
->sched_tags
);
415 mutex_unlock(&q
->sysfs_lock
);
421 static int hctx_sched_tags_open(struct inode
*inode
, struct file
*file
)
423 return single_open(file
, hctx_sched_tags_show
, inode
->i_private
);
426 static const struct file_operations hctx_sched_tags_fops
= {
427 .open
= hctx_sched_tags_open
,
430 .release
= single_release
,
433 static int hctx_sched_tags_bitmap_show(struct seq_file
*m
, void *v
)
435 struct blk_mq_hw_ctx
*hctx
= m
->private;
436 struct request_queue
*q
= hctx
->queue
;
439 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
442 if (hctx
->sched_tags
)
443 sbitmap_bitmap_show(&hctx
->sched_tags
->bitmap_tags
.sb
, m
);
444 mutex_unlock(&q
->sysfs_lock
);
450 static int hctx_sched_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
452 return single_open(file
, hctx_sched_tags_bitmap_show
, inode
->i_private
);
455 static const struct file_operations hctx_sched_tags_bitmap_fops
= {
456 .open
= hctx_sched_tags_bitmap_open
,
459 .release
= single_release
,
462 static int hctx_io_poll_show(struct seq_file
*m
, void *v
)
464 struct blk_mq_hw_ctx
*hctx
= m
->private;
466 seq_printf(m
, "considered=%lu\n", hctx
->poll_considered
);
467 seq_printf(m
, "invoked=%lu\n", hctx
->poll_invoked
);
468 seq_printf(m
, "success=%lu\n", hctx
->poll_success
);
472 static int hctx_io_poll_open(struct inode
*inode
, struct file
*file
)
474 return single_open(file
, hctx_io_poll_show
, inode
->i_private
);
477 static ssize_t
hctx_io_poll_write(struct file
*file
, const char __user
*buf
,
478 size_t count
, loff_t
*ppos
)
480 struct seq_file
*m
= file
->private_data
;
481 struct blk_mq_hw_ctx
*hctx
= m
->private;
483 hctx
->poll_considered
= hctx
->poll_invoked
= hctx
->poll_success
= 0;
487 static const struct file_operations hctx_io_poll_fops
= {
488 .open
= hctx_io_poll_open
,
490 .write
= hctx_io_poll_write
,
492 .release
= single_release
,
495 static int hctx_dispatched_show(struct seq_file
*m
, void *v
)
497 struct blk_mq_hw_ctx
*hctx
= m
->private;
500 seq_printf(m
, "%8u\t%lu\n", 0U, hctx
->dispatched
[0]);
502 for (i
= 1; i
< BLK_MQ_MAX_DISPATCH_ORDER
- 1; i
++) {
503 unsigned int d
= 1U << (i
- 1);
505 seq_printf(m
, "%8u\t%lu\n", d
, hctx
->dispatched
[i
]);
508 seq_printf(m
, "%8u+\t%lu\n", 1U << (i
- 1), hctx
->dispatched
[i
]);
512 static int hctx_dispatched_open(struct inode
*inode
, struct file
*file
)
514 return single_open(file
, hctx_dispatched_show
, inode
->i_private
);
517 static ssize_t
hctx_dispatched_write(struct file
*file
, const char __user
*buf
,
518 size_t count
, loff_t
*ppos
)
520 struct seq_file
*m
= file
->private_data
;
521 struct blk_mq_hw_ctx
*hctx
= m
->private;
524 for (i
= 0; i
< BLK_MQ_MAX_DISPATCH_ORDER
; i
++)
525 hctx
->dispatched
[i
] = 0;
529 static const struct file_operations hctx_dispatched_fops
= {
530 .open
= hctx_dispatched_open
,
532 .write
= hctx_dispatched_write
,
534 .release
= single_release
,
537 static int hctx_queued_show(struct seq_file
*m
, void *v
)
539 struct blk_mq_hw_ctx
*hctx
= m
->private;
541 seq_printf(m
, "%lu\n", hctx
->queued
);
545 static int hctx_queued_open(struct inode
*inode
, struct file
*file
)
547 return single_open(file
, hctx_queued_show
, inode
->i_private
);
550 static ssize_t
hctx_queued_write(struct file
*file
, const char __user
*buf
,
551 size_t count
, loff_t
*ppos
)
553 struct seq_file
*m
= file
->private_data
;
554 struct blk_mq_hw_ctx
*hctx
= m
->private;
560 static const struct file_operations hctx_queued_fops
= {
561 .open
= hctx_queued_open
,
563 .write
= hctx_queued_write
,
565 .release
= single_release
,
568 static int hctx_run_show(struct seq_file
*m
, void *v
)
570 struct blk_mq_hw_ctx
*hctx
= m
->private;
572 seq_printf(m
, "%lu\n", hctx
->run
);
576 static int hctx_run_open(struct inode
*inode
, struct file
*file
)
578 return single_open(file
, hctx_run_show
, inode
->i_private
);
581 static ssize_t
hctx_run_write(struct file
*file
, const char __user
*buf
,
582 size_t count
, loff_t
*ppos
)
584 struct seq_file
*m
= file
->private_data
;
585 struct blk_mq_hw_ctx
*hctx
= m
->private;
591 static const struct file_operations hctx_run_fops
= {
592 .open
= hctx_run_open
,
594 .write
= hctx_run_write
,
596 .release
= single_release
,
599 static int hctx_active_show(struct seq_file
*m
, void *v
)
601 struct blk_mq_hw_ctx
*hctx
= m
->private;
603 seq_printf(m
, "%d\n", atomic_read(&hctx
->nr_active
));
607 static int hctx_active_open(struct inode
*inode
, struct file
*file
)
609 return single_open(file
, hctx_active_show
, inode
->i_private
);
612 static const struct file_operations hctx_active_fops
= {
613 .open
= hctx_active_open
,
616 .release
= single_release
,
619 static void *ctx_rq_list_start(struct seq_file
*m
, loff_t
*pos
)
620 __acquires(&ctx
->lock
)
622 struct blk_mq_ctx
*ctx
= m
->private;
624 spin_lock(&ctx
->lock
);
625 return seq_list_start(&ctx
->rq_list
, *pos
);
628 static void *ctx_rq_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
630 struct blk_mq_ctx
*ctx
= m
->private;
632 return seq_list_next(v
, &ctx
->rq_list
, pos
);
635 static void ctx_rq_list_stop(struct seq_file
*m
, void *v
)
636 __releases(&ctx
->lock
)
638 struct blk_mq_ctx
*ctx
= m
->private;
640 spin_unlock(&ctx
->lock
);
643 static const struct seq_operations ctx_rq_list_seq_ops
= {
644 .start
= ctx_rq_list_start
,
645 .next
= ctx_rq_list_next
,
646 .stop
= ctx_rq_list_stop
,
647 .show
= blk_mq_debugfs_rq_show
,
650 static int ctx_rq_list_open(struct inode
*inode
, struct file
*file
)
652 return blk_mq_debugfs_seq_open(inode
, file
, &ctx_rq_list_seq_ops
);
655 static const struct file_operations ctx_rq_list_fops
= {
656 .open
= ctx_rq_list_open
,
659 .release
= seq_release
,
662 static int ctx_dispatched_show(struct seq_file
*m
, void *v
)
664 struct blk_mq_ctx
*ctx
= m
->private;
666 seq_printf(m
, "%lu %lu\n", ctx
->rq_dispatched
[1], ctx
->rq_dispatched
[0]);
670 static int ctx_dispatched_open(struct inode
*inode
, struct file
*file
)
672 return single_open(file
, ctx_dispatched_show
, inode
->i_private
);
675 static ssize_t
ctx_dispatched_write(struct file
*file
, const char __user
*buf
,
676 size_t count
, loff_t
*ppos
)
678 struct seq_file
*m
= file
->private_data
;
679 struct blk_mq_ctx
*ctx
= m
->private;
681 ctx
->rq_dispatched
[0] = ctx
->rq_dispatched
[1] = 0;
685 static const struct file_operations ctx_dispatched_fops
= {
686 .open
= ctx_dispatched_open
,
688 .write
= ctx_dispatched_write
,
690 .release
= single_release
,
693 static int ctx_merged_show(struct seq_file
*m
, void *v
)
695 struct blk_mq_ctx
*ctx
= m
->private;
697 seq_printf(m
, "%lu\n", ctx
->rq_merged
);
701 static int ctx_merged_open(struct inode
*inode
, struct file
*file
)
703 return single_open(file
, ctx_merged_show
, inode
->i_private
);
706 static ssize_t
ctx_merged_write(struct file
*file
, const char __user
*buf
,
707 size_t count
, loff_t
*ppos
)
709 struct seq_file
*m
= file
->private_data
;
710 struct blk_mq_ctx
*ctx
= m
->private;
716 static const struct file_operations ctx_merged_fops
= {
717 .open
= ctx_merged_open
,
719 .write
= ctx_merged_write
,
721 .release
= single_release
,
724 static int ctx_completed_show(struct seq_file
*m
, void *v
)
726 struct blk_mq_ctx
*ctx
= m
->private;
728 seq_printf(m
, "%lu %lu\n", ctx
->rq_completed
[1], ctx
->rq_completed
[0]);
732 static int ctx_completed_open(struct inode
*inode
, struct file
*file
)
734 return single_open(file
, ctx_completed_show
, inode
->i_private
);
737 static ssize_t
ctx_completed_write(struct file
*file
, const char __user
*buf
,
738 size_t count
, loff_t
*ppos
)
740 struct seq_file
*m
= file
->private_data
;
741 struct blk_mq_ctx
*ctx
= m
->private;
743 ctx
->rq_completed
[0] = ctx
->rq_completed
[1] = 0;
747 static const struct file_operations ctx_completed_fops
= {
748 .open
= ctx_completed_open
,
750 .write
= ctx_completed_write
,
752 .release
= single_release
,
755 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs
[] = {
756 {"poll_stat", 0400, &queue_poll_stat_fops
},
757 {"state", 0600, &blk_queue_flags_fops
},
761 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs
[] = {
762 {"state", 0400, &hctx_state_fops
},
763 {"flags", 0400, &hctx_flags_fops
},
764 {"dispatch", 0400, &hctx_dispatch_fops
},
765 {"ctx_map", 0400, &hctx_ctx_map_fops
},
766 {"tags", 0400, &hctx_tags_fops
},
767 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops
},
768 {"sched_tags", 0400, &hctx_sched_tags_fops
},
769 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops
},
770 {"io_poll", 0600, &hctx_io_poll_fops
},
771 {"dispatched", 0600, &hctx_dispatched_fops
},
772 {"queued", 0600, &hctx_queued_fops
},
773 {"run", 0600, &hctx_run_fops
},
774 {"active", 0400, &hctx_active_fops
},
778 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs
[] = {
779 {"rq_list", 0400, &ctx_rq_list_fops
},
780 {"dispatched", 0600, &ctx_dispatched_fops
},
781 {"merged", 0600, &ctx_merged_fops
},
782 {"completed", 0600, &ctx_completed_fops
},
786 int blk_mq_debugfs_register(struct request_queue
*q
)
788 if (!blk_debugfs_root
)
791 q
->debugfs_dir
= debugfs_create_dir(kobject_name(q
->kobj
.parent
),
796 if (blk_mq_debugfs_register_mq(q
))
802 blk_mq_debugfs_unregister(q
);
806 void blk_mq_debugfs_unregister(struct request_queue
*q
)
808 debugfs_remove_recursive(q
->debugfs_dir
);
809 q
->mq_debugfs_dir
= NULL
;
810 q
->debugfs_dir
= NULL
;
813 static bool debugfs_create_files(struct dentry
*parent
, void *data
,
814 const struct blk_mq_debugfs_attr
*attr
)
816 for (; attr
->name
; attr
++) {
817 if (!debugfs_create_file(attr
->name
, attr
->mode
, parent
,
824 static int blk_mq_debugfs_register_ctx(struct request_queue
*q
,
825 struct blk_mq_ctx
*ctx
,
826 struct dentry
*hctx_dir
)
828 struct dentry
*ctx_dir
;
831 snprintf(name
, sizeof(name
), "cpu%u", ctx
->cpu
);
832 ctx_dir
= debugfs_create_dir(name
, hctx_dir
);
836 if (!debugfs_create_files(ctx_dir
, ctx
, blk_mq_debugfs_ctx_attrs
))
842 static int blk_mq_debugfs_register_hctx(struct request_queue
*q
,
843 struct blk_mq_hw_ctx
*hctx
)
845 struct blk_mq_ctx
*ctx
;
846 struct dentry
*hctx_dir
;
850 snprintf(name
, sizeof(name
), "%u", hctx
->queue_num
);
851 hctx_dir
= debugfs_create_dir(name
, q
->mq_debugfs_dir
);
855 if (!debugfs_create_files(hctx_dir
, hctx
, blk_mq_debugfs_hctx_attrs
))
858 hctx_for_each_ctx(hctx
, ctx
, i
) {
859 if (blk_mq_debugfs_register_ctx(q
, ctx
, hctx_dir
))
866 int blk_mq_debugfs_register_mq(struct request_queue
*q
)
868 struct blk_mq_hw_ctx
*hctx
;
874 q
->mq_debugfs_dir
= debugfs_create_dir("mq", q
->debugfs_dir
);
875 if (!q
->mq_debugfs_dir
)
878 if (!debugfs_create_files(q
->mq_debugfs_dir
, q
, blk_mq_debugfs_queue_attrs
))
881 queue_for_each_hw_ctx(q
, hctx
, i
) {
882 if (blk_mq_debugfs_register_hctx(q
, hctx
))
889 blk_mq_debugfs_unregister_mq(q
);
893 void blk_mq_debugfs_unregister_mq(struct request_queue
*q
)
895 debugfs_remove_recursive(q
->mq_debugfs_dir
);
896 q
->mq_debugfs_dir
= NULL
;