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 const struct blk_mq_debugfs_attr blk_queue_attrs
[] = {
145 {"state", 0600, &blk_queue_flags_fops
},
149 static void print_stat(struct seq_file
*m
, struct blk_rq_stat
*stat
)
151 if (stat
->nr_samples
) {
152 seq_printf(m
, "samples=%d, mean=%lld, min=%llu, max=%llu",
153 stat
->nr_samples
, stat
->mean
, stat
->min
, stat
->max
);
155 seq_puts(m
, "samples=0");
159 static int queue_poll_stat_show(struct seq_file
*m
, void *v
)
161 struct request_queue
*q
= m
->private;
164 for (bucket
= 0; bucket
< BLK_MQ_POLL_STATS_BKTS
/2; bucket
++) {
165 seq_printf(m
, "read (%d Bytes): ", 1 << (9+bucket
));
166 print_stat(m
, &q
->poll_stat
[2*bucket
]);
169 seq_printf(m
, "write (%d Bytes): ", 1 << (9+bucket
));
170 print_stat(m
, &q
->poll_stat
[2*bucket
+1]);
176 static int queue_poll_stat_open(struct inode
*inode
, struct file
*file
)
178 return single_open(file
, queue_poll_stat_show
, inode
->i_private
);
181 static const struct file_operations queue_poll_stat_fops
= {
182 .open
= queue_poll_stat_open
,
185 .release
= single_release
,
188 static const char *const hctx_state_name
[] = {
189 [BLK_MQ_S_STOPPED
] = "STOPPED",
190 [BLK_MQ_S_TAG_ACTIVE
] = "TAG_ACTIVE",
191 [BLK_MQ_S_SCHED_RESTART
] = "SCHED_RESTART",
192 [BLK_MQ_S_TAG_WAITING
] = "TAG_WAITING",
195 static int hctx_state_show(struct seq_file
*m
, void *v
)
197 struct blk_mq_hw_ctx
*hctx
= m
->private;
199 blk_flags_show(m
, hctx
->state
, hctx_state_name
,
200 ARRAY_SIZE(hctx_state_name
));
204 static int hctx_state_open(struct inode
*inode
, struct file
*file
)
206 return single_open(file
, hctx_state_show
, inode
->i_private
);
209 static const struct file_operations hctx_state_fops
= {
210 .open
= hctx_state_open
,
213 .release
= single_release
,
216 static const char *const alloc_policy_name
[] = {
217 [BLK_TAG_ALLOC_FIFO
] = "fifo",
218 [BLK_TAG_ALLOC_RR
] = "rr",
221 static const char *const hctx_flag_name
[] = {
222 [ilog2(BLK_MQ_F_SHOULD_MERGE
)] = "SHOULD_MERGE",
223 [ilog2(BLK_MQ_F_TAG_SHARED
)] = "TAG_SHARED",
224 [ilog2(BLK_MQ_F_SG_MERGE
)] = "SG_MERGE",
225 [ilog2(BLK_MQ_F_BLOCKING
)] = "BLOCKING",
226 [ilog2(BLK_MQ_F_NO_SCHED
)] = "NO_SCHED",
229 static int hctx_flags_show(struct seq_file
*m
, void *v
)
231 struct blk_mq_hw_ctx
*hctx
= m
->private;
232 const int alloc_policy
= BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx
->flags
);
234 seq_puts(m
, "alloc_policy=");
235 if (alloc_policy
< ARRAY_SIZE(alloc_policy_name
) &&
236 alloc_policy_name
[alloc_policy
])
237 seq_puts(m
, alloc_policy_name
[alloc_policy
]);
239 seq_printf(m
, "%d", alloc_policy
);
242 hctx
->flags
^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy
),
243 hctx_flag_name
, ARRAY_SIZE(hctx_flag_name
));
247 static int hctx_flags_open(struct inode
*inode
, struct file
*file
)
249 return single_open(file
, hctx_flags_show
, inode
->i_private
);
252 static const struct file_operations hctx_flags_fops
= {
253 .open
= hctx_flags_open
,
256 .release
= single_release
,
259 static int blk_mq_debugfs_rq_show(struct seq_file
*m
, void *v
)
261 struct request
*rq
= list_entry_rq(v
);
263 seq_printf(m
, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n",
264 rq
, rq
->cmd_flags
, (__force
unsigned int)rq
->rq_flags
,
265 rq
->tag
, rq
->internal_tag
);
269 static void *hctx_dispatch_start(struct seq_file
*m
, loff_t
*pos
)
270 __acquires(&hctx
->lock
)
272 struct blk_mq_hw_ctx
*hctx
= m
->private;
274 spin_lock(&hctx
->lock
);
275 return seq_list_start(&hctx
->dispatch
, *pos
);
278 static void *hctx_dispatch_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
280 struct blk_mq_hw_ctx
*hctx
= m
->private;
282 return seq_list_next(v
, &hctx
->dispatch
, pos
);
285 static void hctx_dispatch_stop(struct seq_file
*m
, void *v
)
286 __releases(&hctx
->lock
)
288 struct blk_mq_hw_ctx
*hctx
= m
->private;
290 spin_unlock(&hctx
->lock
);
293 static const struct seq_operations hctx_dispatch_seq_ops
= {
294 .start
= hctx_dispatch_start
,
295 .next
= hctx_dispatch_next
,
296 .stop
= hctx_dispatch_stop
,
297 .show
= blk_mq_debugfs_rq_show
,
300 static int hctx_dispatch_open(struct inode
*inode
, struct file
*file
)
302 return blk_mq_debugfs_seq_open(inode
, file
, &hctx_dispatch_seq_ops
);
305 static const struct file_operations hctx_dispatch_fops
= {
306 .open
= hctx_dispatch_open
,
309 .release
= seq_release
,
312 static int hctx_ctx_map_show(struct seq_file
*m
, void *v
)
314 struct blk_mq_hw_ctx
*hctx
= m
->private;
316 sbitmap_bitmap_show(&hctx
->ctx_map
, m
);
320 static int hctx_ctx_map_open(struct inode
*inode
, struct file
*file
)
322 return single_open(file
, hctx_ctx_map_show
, inode
->i_private
);
325 static const struct file_operations hctx_ctx_map_fops
= {
326 .open
= hctx_ctx_map_open
,
329 .release
= single_release
,
332 static void blk_mq_debugfs_tags_show(struct seq_file
*m
,
333 struct blk_mq_tags
*tags
)
335 seq_printf(m
, "nr_tags=%u\n", tags
->nr_tags
);
336 seq_printf(m
, "nr_reserved_tags=%u\n", tags
->nr_reserved_tags
);
337 seq_printf(m
, "active_queues=%d\n",
338 atomic_read(&tags
->active_queues
));
340 seq_puts(m
, "\nbitmap_tags:\n");
341 sbitmap_queue_show(&tags
->bitmap_tags
, m
);
343 if (tags
->nr_reserved_tags
) {
344 seq_puts(m
, "\nbreserved_tags:\n");
345 sbitmap_queue_show(&tags
->breserved_tags
, m
);
349 static int hctx_tags_show(struct seq_file
*m
, void *v
)
351 struct blk_mq_hw_ctx
*hctx
= m
->private;
352 struct request_queue
*q
= hctx
->queue
;
355 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
359 blk_mq_debugfs_tags_show(m
, hctx
->tags
);
360 mutex_unlock(&q
->sysfs_lock
);
366 static int hctx_tags_open(struct inode
*inode
, struct file
*file
)
368 return single_open(file
, hctx_tags_show
, inode
->i_private
);
371 static const struct file_operations hctx_tags_fops
= {
372 .open
= hctx_tags_open
,
375 .release
= single_release
,
378 static int hctx_tags_bitmap_show(struct seq_file
*m
, void *v
)
380 struct blk_mq_hw_ctx
*hctx
= m
->private;
381 struct request_queue
*q
= hctx
->queue
;
384 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
388 sbitmap_bitmap_show(&hctx
->tags
->bitmap_tags
.sb
, m
);
389 mutex_unlock(&q
->sysfs_lock
);
395 static int hctx_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
397 return single_open(file
, hctx_tags_bitmap_show
, inode
->i_private
);
400 static const struct file_operations hctx_tags_bitmap_fops
= {
401 .open
= hctx_tags_bitmap_open
,
404 .release
= single_release
,
407 static int hctx_sched_tags_show(struct seq_file
*m
, void *v
)
409 struct blk_mq_hw_ctx
*hctx
= m
->private;
410 struct request_queue
*q
= hctx
->queue
;
413 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
416 if (hctx
->sched_tags
)
417 blk_mq_debugfs_tags_show(m
, hctx
->sched_tags
);
418 mutex_unlock(&q
->sysfs_lock
);
424 static int hctx_sched_tags_open(struct inode
*inode
, struct file
*file
)
426 return single_open(file
, hctx_sched_tags_show
, inode
->i_private
);
429 static const struct file_operations hctx_sched_tags_fops
= {
430 .open
= hctx_sched_tags_open
,
433 .release
= single_release
,
436 static int hctx_sched_tags_bitmap_show(struct seq_file
*m
, void *v
)
438 struct blk_mq_hw_ctx
*hctx
= m
->private;
439 struct request_queue
*q
= hctx
->queue
;
442 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
445 if (hctx
->sched_tags
)
446 sbitmap_bitmap_show(&hctx
->sched_tags
->bitmap_tags
.sb
, m
);
447 mutex_unlock(&q
->sysfs_lock
);
453 static int hctx_sched_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
455 return single_open(file
, hctx_sched_tags_bitmap_show
, inode
->i_private
);
458 static const struct file_operations hctx_sched_tags_bitmap_fops
= {
459 .open
= hctx_sched_tags_bitmap_open
,
462 .release
= single_release
,
465 static int hctx_io_poll_show(struct seq_file
*m
, void *v
)
467 struct blk_mq_hw_ctx
*hctx
= m
->private;
469 seq_printf(m
, "considered=%lu\n", hctx
->poll_considered
);
470 seq_printf(m
, "invoked=%lu\n", hctx
->poll_invoked
);
471 seq_printf(m
, "success=%lu\n", hctx
->poll_success
);
475 static int hctx_io_poll_open(struct inode
*inode
, struct file
*file
)
477 return single_open(file
, hctx_io_poll_show
, inode
->i_private
);
480 static ssize_t
hctx_io_poll_write(struct file
*file
, const char __user
*buf
,
481 size_t count
, loff_t
*ppos
)
483 struct seq_file
*m
= file
->private_data
;
484 struct blk_mq_hw_ctx
*hctx
= m
->private;
486 hctx
->poll_considered
= hctx
->poll_invoked
= hctx
->poll_success
= 0;
490 static const struct file_operations hctx_io_poll_fops
= {
491 .open
= hctx_io_poll_open
,
493 .write
= hctx_io_poll_write
,
495 .release
= single_release
,
498 static int hctx_dispatched_show(struct seq_file
*m
, void *v
)
500 struct blk_mq_hw_ctx
*hctx
= m
->private;
503 seq_printf(m
, "%8u\t%lu\n", 0U, hctx
->dispatched
[0]);
505 for (i
= 1; i
< BLK_MQ_MAX_DISPATCH_ORDER
- 1; i
++) {
506 unsigned int d
= 1U << (i
- 1);
508 seq_printf(m
, "%8u\t%lu\n", d
, hctx
->dispatched
[i
]);
511 seq_printf(m
, "%8u+\t%lu\n", 1U << (i
- 1), hctx
->dispatched
[i
]);
515 static int hctx_dispatched_open(struct inode
*inode
, struct file
*file
)
517 return single_open(file
, hctx_dispatched_show
, inode
->i_private
);
520 static ssize_t
hctx_dispatched_write(struct file
*file
, const char __user
*buf
,
521 size_t count
, loff_t
*ppos
)
523 struct seq_file
*m
= file
->private_data
;
524 struct blk_mq_hw_ctx
*hctx
= m
->private;
527 for (i
= 0; i
< BLK_MQ_MAX_DISPATCH_ORDER
; i
++)
528 hctx
->dispatched
[i
] = 0;
532 static const struct file_operations hctx_dispatched_fops
= {
533 .open
= hctx_dispatched_open
,
535 .write
= hctx_dispatched_write
,
537 .release
= single_release
,
540 static int hctx_queued_show(struct seq_file
*m
, void *v
)
542 struct blk_mq_hw_ctx
*hctx
= m
->private;
544 seq_printf(m
, "%lu\n", hctx
->queued
);
548 static int hctx_queued_open(struct inode
*inode
, struct file
*file
)
550 return single_open(file
, hctx_queued_show
, inode
->i_private
);
553 static ssize_t
hctx_queued_write(struct file
*file
, const char __user
*buf
,
554 size_t count
, loff_t
*ppos
)
556 struct seq_file
*m
= file
->private_data
;
557 struct blk_mq_hw_ctx
*hctx
= m
->private;
563 static const struct file_operations hctx_queued_fops
= {
564 .open
= hctx_queued_open
,
566 .write
= hctx_queued_write
,
568 .release
= single_release
,
571 static int hctx_run_show(struct seq_file
*m
, void *v
)
573 struct blk_mq_hw_ctx
*hctx
= m
->private;
575 seq_printf(m
, "%lu\n", hctx
->run
);
579 static int hctx_run_open(struct inode
*inode
, struct file
*file
)
581 return single_open(file
, hctx_run_show
, inode
->i_private
);
584 static ssize_t
hctx_run_write(struct file
*file
, const char __user
*buf
,
585 size_t count
, loff_t
*ppos
)
587 struct seq_file
*m
= file
->private_data
;
588 struct blk_mq_hw_ctx
*hctx
= m
->private;
594 static const struct file_operations hctx_run_fops
= {
595 .open
= hctx_run_open
,
597 .write
= hctx_run_write
,
599 .release
= single_release
,
602 static int hctx_active_show(struct seq_file
*m
, void *v
)
604 struct blk_mq_hw_ctx
*hctx
= m
->private;
606 seq_printf(m
, "%d\n", atomic_read(&hctx
->nr_active
));
610 static int hctx_active_open(struct inode
*inode
, struct file
*file
)
612 return single_open(file
, hctx_active_show
, inode
->i_private
);
615 static const struct file_operations hctx_active_fops
= {
616 .open
= hctx_active_open
,
619 .release
= single_release
,
622 static void *ctx_rq_list_start(struct seq_file
*m
, loff_t
*pos
)
623 __acquires(&ctx
->lock
)
625 struct blk_mq_ctx
*ctx
= m
->private;
627 spin_lock(&ctx
->lock
);
628 return seq_list_start(&ctx
->rq_list
, *pos
);
631 static void *ctx_rq_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
633 struct blk_mq_ctx
*ctx
= m
->private;
635 return seq_list_next(v
, &ctx
->rq_list
, pos
);
638 static void ctx_rq_list_stop(struct seq_file
*m
, void *v
)
639 __releases(&ctx
->lock
)
641 struct blk_mq_ctx
*ctx
= m
->private;
643 spin_unlock(&ctx
->lock
);
646 static const struct seq_operations ctx_rq_list_seq_ops
= {
647 .start
= ctx_rq_list_start
,
648 .next
= ctx_rq_list_next
,
649 .stop
= ctx_rq_list_stop
,
650 .show
= blk_mq_debugfs_rq_show
,
653 static int ctx_rq_list_open(struct inode
*inode
, struct file
*file
)
655 return blk_mq_debugfs_seq_open(inode
, file
, &ctx_rq_list_seq_ops
);
658 static const struct file_operations ctx_rq_list_fops
= {
659 .open
= ctx_rq_list_open
,
662 .release
= seq_release
,
665 static int ctx_dispatched_show(struct seq_file
*m
, void *v
)
667 struct blk_mq_ctx
*ctx
= m
->private;
669 seq_printf(m
, "%lu %lu\n", ctx
->rq_dispatched
[1], ctx
->rq_dispatched
[0]);
673 static int ctx_dispatched_open(struct inode
*inode
, struct file
*file
)
675 return single_open(file
, ctx_dispatched_show
, inode
->i_private
);
678 static ssize_t
ctx_dispatched_write(struct file
*file
, const char __user
*buf
,
679 size_t count
, loff_t
*ppos
)
681 struct seq_file
*m
= file
->private_data
;
682 struct blk_mq_ctx
*ctx
= m
->private;
684 ctx
->rq_dispatched
[0] = ctx
->rq_dispatched
[1] = 0;
688 static const struct file_operations ctx_dispatched_fops
= {
689 .open
= ctx_dispatched_open
,
691 .write
= ctx_dispatched_write
,
693 .release
= single_release
,
696 static int ctx_merged_show(struct seq_file
*m
, void *v
)
698 struct blk_mq_ctx
*ctx
= m
->private;
700 seq_printf(m
, "%lu\n", ctx
->rq_merged
);
704 static int ctx_merged_open(struct inode
*inode
, struct file
*file
)
706 return single_open(file
, ctx_merged_show
, inode
->i_private
);
709 static ssize_t
ctx_merged_write(struct file
*file
, const char __user
*buf
,
710 size_t count
, loff_t
*ppos
)
712 struct seq_file
*m
= file
->private_data
;
713 struct blk_mq_ctx
*ctx
= m
->private;
719 static const struct file_operations ctx_merged_fops
= {
720 .open
= ctx_merged_open
,
722 .write
= ctx_merged_write
,
724 .release
= single_release
,
727 static int ctx_completed_show(struct seq_file
*m
, void *v
)
729 struct blk_mq_ctx
*ctx
= m
->private;
731 seq_printf(m
, "%lu %lu\n", ctx
->rq_completed
[1], ctx
->rq_completed
[0]);
735 static int ctx_completed_open(struct inode
*inode
, struct file
*file
)
737 return single_open(file
, ctx_completed_show
, inode
->i_private
);
740 static ssize_t
ctx_completed_write(struct file
*file
, const char __user
*buf
,
741 size_t count
, loff_t
*ppos
)
743 struct seq_file
*m
= file
->private_data
;
744 struct blk_mq_ctx
*ctx
= m
->private;
746 ctx
->rq_completed
[0] = ctx
->rq_completed
[1] = 0;
750 static const struct file_operations ctx_completed_fops
= {
751 .open
= ctx_completed_open
,
753 .write
= ctx_completed_write
,
755 .release
= single_release
,
758 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs
[] = {
759 {"poll_stat", 0400, &queue_poll_stat_fops
},
763 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs
[] = {
764 {"state", 0400, &hctx_state_fops
},
765 {"flags", 0400, &hctx_flags_fops
},
766 {"dispatch", 0400, &hctx_dispatch_fops
},
767 {"ctx_map", 0400, &hctx_ctx_map_fops
},
768 {"tags", 0400, &hctx_tags_fops
},
769 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops
},
770 {"sched_tags", 0400, &hctx_sched_tags_fops
},
771 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops
},
772 {"io_poll", 0600, &hctx_io_poll_fops
},
773 {"dispatched", 0600, &hctx_dispatched_fops
},
774 {"queued", 0600, &hctx_queued_fops
},
775 {"run", 0600, &hctx_run_fops
},
776 {"active", 0400, &hctx_active_fops
},
780 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs
[] = {
781 {"rq_list", 0400, &ctx_rq_list_fops
},
782 {"dispatched", 0600, &ctx_dispatched_fops
},
783 {"merged", 0600, &ctx_merged_fops
},
784 {"completed", 0600, &ctx_completed_fops
},
788 int blk_mq_debugfs_register(struct request_queue
*q
, const char *name
)
790 if (!blk_debugfs_root
)
793 q
->debugfs_dir
= debugfs_create_dir(name
, blk_debugfs_root
);
797 if (blk_mq_debugfs_register_hctxs(q
))
803 blk_mq_debugfs_unregister(q
);
807 void blk_mq_debugfs_unregister(struct request_queue
*q
)
809 debugfs_remove_recursive(q
->debugfs_dir
);
810 q
->mq_debugfs_dir
= NULL
;
811 q
->debugfs_dir
= NULL
;
814 static bool debugfs_create_files(struct dentry
*parent
, void *data
,
815 const struct blk_mq_debugfs_attr
*attr
)
817 for (; attr
->name
; attr
++) {
818 if (!debugfs_create_file(attr
->name
, attr
->mode
, parent
,
825 static int blk_mq_debugfs_register_ctx(struct request_queue
*q
,
826 struct blk_mq_ctx
*ctx
,
827 struct dentry
*hctx_dir
)
829 struct dentry
*ctx_dir
;
832 snprintf(name
, sizeof(name
), "cpu%u", ctx
->cpu
);
833 ctx_dir
= debugfs_create_dir(name
, hctx_dir
);
837 if (!debugfs_create_files(ctx_dir
, ctx
, blk_mq_debugfs_ctx_attrs
))
843 static int blk_mq_debugfs_register_hctx(struct request_queue
*q
,
844 struct blk_mq_hw_ctx
*hctx
)
846 struct blk_mq_ctx
*ctx
;
847 struct dentry
*hctx_dir
;
851 snprintf(name
, sizeof(name
), "%u", hctx
->queue_num
);
852 hctx_dir
= debugfs_create_dir(name
, q
->mq_debugfs_dir
);
856 if (!debugfs_create_files(hctx_dir
, hctx
, blk_mq_debugfs_hctx_attrs
))
859 hctx_for_each_ctx(hctx
, ctx
, i
) {
860 if (blk_mq_debugfs_register_ctx(q
, ctx
, hctx_dir
))
867 int blk_mq_debugfs_register_hctxs(struct request_queue
*q
)
869 struct blk_mq_hw_ctx
*hctx
;
875 if (!debugfs_create_files(q
->debugfs_dir
, q
, blk_queue_attrs
))
878 q
->mq_debugfs_dir
= debugfs_create_dir("mq", q
->debugfs_dir
);
879 if (!q
->mq_debugfs_dir
)
882 if (!debugfs_create_files(q
->mq_debugfs_dir
, q
, blk_mq_debugfs_queue_attrs
))
885 queue_for_each_hw_ctx(q
, hctx
, i
) {
886 if (blk_mq_debugfs_register_hctx(q
, hctx
))
893 blk_mq_debugfs_unregister_hctxs(q
);
897 void blk_mq_debugfs_unregister_hctxs(struct request_queue
*q
)
899 debugfs_remove_recursive(q
->mq_debugfs_dir
);
900 q
->mq_debugfs_dir
= NULL
;