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 int blk_flags_show(struct seq_file
*m
, const unsigned long flags
,
28 const char *const *flag_name
, int flag_name_count
)
33 for (i
= 0; i
< sizeof(flags
) * BITS_PER_BYTE
; i
++) {
34 if (!(flags
& BIT(i
)))
39 if (i
< flag_name_count
&& flag_name
[i
])
40 seq_puts(m
, flag_name
[i
]);
42 seq_printf(m
, "%d", i
);
47 #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
48 static const char *const blk_queue_flag_name
[] = {
49 QUEUE_FLAG_NAME(QUEUED
),
50 QUEUE_FLAG_NAME(STOPPED
),
51 QUEUE_FLAG_NAME(DYING
),
52 QUEUE_FLAG_NAME(BYPASS
),
53 QUEUE_FLAG_NAME(BIDI
),
54 QUEUE_FLAG_NAME(NOMERGES
),
55 QUEUE_FLAG_NAME(SAME_COMP
),
56 QUEUE_FLAG_NAME(FAIL_IO
),
57 QUEUE_FLAG_NAME(NONROT
),
58 QUEUE_FLAG_NAME(IO_STAT
),
59 QUEUE_FLAG_NAME(DISCARD
),
60 QUEUE_FLAG_NAME(NOXMERGES
),
61 QUEUE_FLAG_NAME(ADD_RANDOM
),
62 QUEUE_FLAG_NAME(SECERASE
),
63 QUEUE_FLAG_NAME(SAME_FORCE
),
64 QUEUE_FLAG_NAME(DEAD
),
65 QUEUE_FLAG_NAME(INIT_DONE
),
66 QUEUE_FLAG_NAME(NO_SG_MERGE
),
67 QUEUE_FLAG_NAME(POLL
),
70 QUEUE_FLAG_NAME(FLUSH_NQ
),
72 QUEUE_FLAG_NAME(STATS
),
73 QUEUE_FLAG_NAME(POLL_STATS
),
74 QUEUE_FLAG_NAME(REGISTERED
),
75 QUEUE_FLAG_NAME(SCSI_PASSTHROUGH
),
76 QUEUE_FLAG_NAME(QUIESCED
),
78 #undef QUEUE_FLAG_NAME
80 static int queue_state_show(void *data
, struct seq_file
*m
)
82 struct request_queue
*q
= data
;
84 blk_flags_show(m
, q
->queue_flags
, blk_queue_flag_name
,
85 ARRAY_SIZE(blk_queue_flag_name
));
90 static ssize_t
queue_state_write(void *data
, const char __user
*buf
,
91 size_t count
, loff_t
*ppos
)
93 struct request_queue
*q
= data
;
94 char opbuf
[16] = { }, *op
;
97 * The "state" attribute is removed after blk_cleanup_queue() has called
98 * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
99 * triggering a use-after-free.
101 if (blk_queue_dead(q
))
104 if (count
>= sizeof(opbuf
)) {
105 pr_err("%s: operation too long\n", __func__
);
109 if (copy_from_user(opbuf
, buf
, count
))
111 op
= strstrip(opbuf
);
112 if (strcmp(op
, "run") == 0) {
113 blk_mq_run_hw_queues(q
, true);
114 } else if (strcmp(op
, "start") == 0) {
115 blk_mq_start_stopped_hw_queues(q
, true);
116 } else if (strcmp(op
, "kick") == 0) {
117 blk_mq_kick_requeue_list(q
);
119 pr_err("%s: unsupported operation '%s'\n", __func__
, op
);
121 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__
);
127 static void print_stat(struct seq_file
*m
, struct blk_rq_stat
*stat
)
129 if (stat
->nr_samples
) {
130 seq_printf(m
, "samples=%d, mean=%lld, min=%llu, max=%llu",
131 stat
->nr_samples
, stat
->mean
, stat
->min
, stat
->max
);
133 seq_puts(m
, "samples=0");
137 static int queue_write_hint_show(void *data
, struct seq_file
*m
)
139 struct request_queue
*q
= data
;
142 for (i
= 0; i
< BLK_MAX_WRITE_HINTS
; i
++)
143 seq_printf(m
, "hint%d: %llu\n", i
, q
->write_hints
[i
]);
148 static ssize_t
queue_write_hint_store(void *data
, const char __user
*buf
,
149 size_t count
, loff_t
*ppos
)
151 struct request_queue
*q
= data
;
154 for (i
= 0; i
< BLK_MAX_WRITE_HINTS
; i
++)
155 q
->write_hints
[i
] = 0;
160 static int queue_poll_stat_show(void *data
, struct seq_file
*m
)
162 struct request_queue
*q
= data
;
165 for (bucket
= 0; bucket
< BLK_MQ_POLL_STATS_BKTS
/2; bucket
++) {
166 seq_printf(m
, "read (%d Bytes): ", 1 << (9+bucket
));
167 print_stat(m
, &q
->poll_stat
[2*bucket
]);
170 seq_printf(m
, "write (%d Bytes): ", 1 << (9+bucket
));
171 print_stat(m
, &q
->poll_stat
[2*bucket
+1]);
177 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
178 static const char *const hctx_state_name
[] = {
179 HCTX_STATE_NAME(STOPPED
),
180 HCTX_STATE_NAME(TAG_ACTIVE
),
181 HCTX_STATE_NAME(SCHED_RESTART
),
182 HCTX_STATE_NAME(START_ON_RUN
),
184 #undef HCTX_STATE_NAME
186 static int hctx_state_show(void *data
, struct seq_file
*m
)
188 struct blk_mq_hw_ctx
*hctx
= data
;
190 blk_flags_show(m
, hctx
->state
, hctx_state_name
,
191 ARRAY_SIZE(hctx_state_name
));
196 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
197 static const char *const alloc_policy_name
[] = {
198 BLK_TAG_ALLOC_NAME(FIFO
),
199 BLK_TAG_ALLOC_NAME(RR
),
201 #undef BLK_TAG_ALLOC_NAME
203 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
204 static const char *const hctx_flag_name
[] = {
205 HCTX_FLAG_NAME(SHOULD_MERGE
),
206 HCTX_FLAG_NAME(TAG_SHARED
),
207 HCTX_FLAG_NAME(SG_MERGE
),
208 HCTX_FLAG_NAME(BLOCKING
),
209 HCTX_FLAG_NAME(NO_SCHED
),
211 #undef HCTX_FLAG_NAME
213 static int hctx_flags_show(void *data
, struct seq_file
*m
)
215 struct blk_mq_hw_ctx
*hctx
= data
;
216 const int alloc_policy
= BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx
->flags
);
218 seq_puts(m
, "alloc_policy=");
219 if (alloc_policy
< ARRAY_SIZE(alloc_policy_name
) &&
220 alloc_policy_name
[alloc_policy
])
221 seq_puts(m
, alloc_policy_name
[alloc_policy
]);
223 seq_printf(m
, "%d", alloc_policy
);
226 hctx
->flags
^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy
),
227 hctx_flag_name
, ARRAY_SIZE(hctx_flag_name
));
232 #define REQ_OP_NAME(name) [REQ_OP_##name] = #name
233 static const char *const op_name
[] = {
237 REQ_OP_NAME(DISCARD
),
238 REQ_OP_NAME(ZONE_REPORT
),
239 REQ_OP_NAME(SECURE_ERASE
),
240 REQ_OP_NAME(ZONE_RESET
),
241 REQ_OP_NAME(WRITE_SAME
),
242 REQ_OP_NAME(WRITE_ZEROES
),
243 REQ_OP_NAME(SCSI_IN
),
244 REQ_OP_NAME(SCSI_OUT
),
246 REQ_OP_NAME(DRV_OUT
),
250 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
251 static const char *const cmd_flag_name
[] = {
252 CMD_FLAG_NAME(FAILFAST_DEV
),
253 CMD_FLAG_NAME(FAILFAST_TRANSPORT
),
254 CMD_FLAG_NAME(FAILFAST_DRIVER
),
258 CMD_FLAG_NAME(NOMERGE
),
260 CMD_FLAG_NAME(INTEGRITY
),
262 CMD_FLAG_NAME(PREFLUSH
),
263 CMD_FLAG_NAME(RAHEAD
),
264 CMD_FLAG_NAME(BACKGROUND
),
265 CMD_FLAG_NAME(NOUNMAP
),
266 CMD_FLAG_NAME(NOWAIT
),
270 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
271 static const char *const rqf_name
[] = {
275 RQF_NAME(SOFTBARRIER
),
277 RQF_NAME(MIXED_MERGE
),
278 RQF_NAME(MQ_INFLIGHT
),
290 RQF_NAME(SPECIAL_PAYLOAD
),
294 #define RQAF_NAME(name) [REQ_ATOM_##name] = #name
295 static const char *const rqaf_name
[] = {
298 RQAF_NAME(POLL_SLEPT
),
302 int __blk_mq_debugfs_rq_show(struct seq_file
*m
, struct request
*rq
)
304 const struct blk_mq_ops
*const mq_ops
= rq
->q
->mq_ops
;
305 const unsigned int op
= rq
->cmd_flags
& REQ_OP_MASK
;
307 seq_printf(m
, "%p {.op=", rq
);
308 if (op
< ARRAY_SIZE(op_name
) && op_name
[op
])
309 seq_printf(m
, "%s", op_name
[op
]);
311 seq_printf(m
, "%d", op
);
312 seq_puts(m
, ", .cmd_flags=");
313 blk_flags_show(m
, rq
->cmd_flags
& ~REQ_OP_MASK
, cmd_flag_name
,
314 ARRAY_SIZE(cmd_flag_name
));
315 seq_puts(m
, ", .rq_flags=");
316 blk_flags_show(m
, (__force
unsigned int)rq
->rq_flags
, rqf_name
,
317 ARRAY_SIZE(rqf_name
));
318 seq_puts(m
, ", .atomic_flags=");
319 blk_flags_show(m
, rq
->atomic_flags
, rqaf_name
, ARRAY_SIZE(rqaf_name
));
320 seq_printf(m
, ", .tag=%d, .internal_tag=%d", rq
->tag
,
323 mq_ops
->show_rq(m
, rq
);
327 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show
);
329 int blk_mq_debugfs_rq_show(struct seq_file
*m
, void *v
)
331 return __blk_mq_debugfs_rq_show(m
, list_entry_rq(v
));
333 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show
);
335 static void *queue_requeue_list_start(struct seq_file
*m
, loff_t
*pos
)
336 __acquires(&q
->requeue_lock
)
338 struct request_queue
*q
= m
->private;
340 spin_lock_irq(&q
->requeue_lock
);
341 return seq_list_start(&q
->requeue_list
, *pos
);
344 static void *queue_requeue_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
346 struct request_queue
*q
= m
->private;
348 return seq_list_next(v
, &q
->requeue_list
, pos
);
351 static void queue_requeue_list_stop(struct seq_file
*m
, void *v
)
352 __releases(&q
->requeue_lock
)
354 struct request_queue
*q
= m
->private;
356 spin_unlock_irq(&q
->requeue_lock
);
359 static const struct seq_operations queue_requeue_list_seq_ops
= {
360 .start
= queue_requeue_list_start
,
361 .next
= queue_requeue_list_next
,
362 .stop
= queue_requeue_list_stop
,
363 .show
= blk_mq_debugfs_rq_show
,
366 static void *hctx_dispatch_start(struct seq_file
*m
, loff_t
*pos
)
367 __acquires(&hctx
->lock
)
369 struct blk_mq_hw_ctx
*hctx
= m
->private;
371 spin_lock(&hctx
->lock
);
372 return seq_list_start(&hctx
->dispatch
, *pos
);
375 static void *hctx_dispatch_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
377 struct blk_mq_hw_ctx
*hctx
= m
->private;
379 return seq_list_next(v
, &hctx
->dispatch
, pos
);
382 static void hctx_dispatch_stop(struct seq_file
*m
, void *v
)
383 __releases(&hctx
->lock
)
385 struct blk_mq_hw_ctx
*hctx
= m
->private;
387 spin_unlock(&hctx
->lock
);
390 static const struct seq_operations hctx_dispatch_seq_ops
= {
391 .start
= hctx_dispatch_start
,
392 .next
= hctx_dispatch_next
,
393 .stop
= hctx_dispatch_stop
,
394 .show
= blk_mq_debugfs_rq_show
,
397 struct show_busy_params
{
399 struct blk_mq_hw_ctx
*hctx
;
403 * Note: the state of a request may change while this function is in progress,
404 * e.g. due to a concurrent blk_mq_finish_request() call.
406 static void hctx_show_busy_rq(struct request
*rq
, void *data
, bool reserved
)
408 const struct show_busy_params
*params
= data
;
410 if (blk_mq_map_queue(rq
->q
, rq
->mq_ctx
->cpu
) == params
->hctx
&&
411 test_bit(REQ_ATOM_STARTED
, &rq
->atomic_flags
))
412 __blk_mq_debugfs_rq_show(params
->m
,
413 list_entry_rq(&rq
->queuelist
));
416 static int hctx_busy_show(void *data
, struct seq_file
*m
)
418 struct blk_mq_hw_ctx
*hctx
= data
;
419 struct show_busy_params params
= { .m
= m
, .hctx
= hctx
};
421 blk_mq_tagset_busy_iter(hctx
->queue
->tag_set
, hctx_show_busy_rq
,
427 static int hctx_ctx_map_show(void *data
, struct seq_file
*m
)
429 struct blk_mq_hw_ctx
*hctx
= data
;
431 sbitmap_bitmap_show(&hctx
->ctx_map
, m
);
435 static void blk_mq_debugfs_tags_show(struct seq_file
*m
,
436 struct blk_mq_tags
*tags
)
438 seq_printf(m
, "nr_tags=%u\n", tags
->nr_tags
);
439 seq_printf(m
, "nr_reserved_tags=%u\n", tags
->nr_reserved_tags
);
440 seq_printf(m
, "active_queues=%d\n",
441 atomic_read(&tags
->active_queues
));
443 seq_puts(m
, "\nbitmap_tags:\n");
444 sbitmap_queue_show(&tags
->bitmap_tags
, m
);
446 if (tags
->nr_reserved_tags
) {
447 seq_puts(m
, "\nbreserved_tags:\n");
448 sbitmap_queue_show(&tags
->breserved_tags
, m
);
452 static int hctx_tags_show(void *data
, struct seq_file
*m
)
454 struct blk_mq_hw_ctx
*hctx
= data
;
455 struct request_queue
*q
= hctx
->queue
;
458 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
462 blk_mq_debugfs_tags_show(m
, hctx
->tags
);
463 mutex_unlock(&q
->sysfs_lock
);
469 static int hctx_tags_bitmap_show(void *data
, struct seq_file
*m
)
471 struct blk_mq_hw_ctx
*hctx
= data
;
472 struct request_queue
*q
= hctx
->queue
;
475 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
479 sbitmap_bitmap_show(&hctx
->tags
->bitmap_tags
.sb
, m
);
480 mutex_unlock(&q
->sysfs_lock
);
486 static int hctx_sched_tags_show(void *data
, struct seq_file
*m
)
488 struct blk_mq_hw_ctx
*hctx
= data
;
489 struct request_queue
*q
= hctx
->queue
;
492 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
495 if (hctx
->sched_tags
)
496 blk_mq_debugfs_tags_show(m
, hctx
->sched_tags
);
497 mutex_unlock(&q
->sysfs_lock
);
503 static int hctx_sched_tags_bitmap_show(void *data
, struct seq_file
*m
)
505 struct blk_mq_hw_ctx
*hctx
= data
;
506 struct request_queue
*q
= hctx
->queue
;
509 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
512 if (hctx
->sched_tags
)
513 sbitmap_bitmap_show(&hctx
->sched_tags
->bitmap_tags
.sb
, m
);
514 mutex_unlock(&q
->sysfs_lock
);
520 static int hctx_io_poll_show(void *data
, struct seq_file
*m
)
522 struct blk_mq_hw_ctx
*hctx
= data
;
524 seq_printf(m
, "considered=%lu\n", hctx
->poll_considered
);
525 seq_printf(m
, "invoked=%lu\n", hctx
->poll_invoked
);
526 seq_printf(m
, "success=%lu\n", hctx
->poll_success
);
530 static ssize_t
hctx_io_poll_write(void *data
, const char __user
*buf
,
531 size_t count
, loff_t
*ppos
)
533 struct blk_mq_hw_ctx
*hctx
= data
;
535 hctx
->poll_considered
= hctx
->poll_invoked
= hctx
->poll_success
= 0;
539 static int hctx_dispatched_show(void *data
, struct seq_file
*m
)
541 struct blk_mq_hw_ctx
*hctx
= data
;
544 seq_printf(m
, "%8u\t%lu\n", 0U, hctx
->dispatched
[0]);
546 for (i
= 1; i
< BLK_MQ_MAX_DISPATCH_ORDER
- 1; i
++) {
547 unsigned int d
= 1U << (i
- 1);
549 seq_printf(m
, "%8u\t%lu\n", d
, hctx
->dispatched
[i
]);
552 seq_printf(m
, "%8u+\t%lu\n", 1U << (i
- 1), hctx
->dispatched
[i
]);
556 static ssize_t
hctx_dispatched_write(void *data
, const char __user
*buf
,
557 size_t count
, loff_t
*ppos
)
559 struct blk_mq_hw_ctx
*hctx
= data
;
562 for (i
= 0; i
< BLK_MQ_MAX_DISPATCH_ORDER
; i
++)
563 hctx
->dispatched
[i
] = 0;
567 static int hctx_queued_show(void *data
, struct seq_file
*m
)
569 struct blk_mq_hw_ctx
*hctx
= data
;
571 seq_printf(m
, "%lu\n", hctx
->queued
);
575 static ssize_t
hctx_queued_write(void *data
, const char __user
*buf
,
576 size_t count
, loff_t
*ppos
)
578 struct blk_mq_hw_ctx
*hctx
= data
;
584 static int hctx_run_show(void *data
, struct seq_file
*m
)
586 struct blk_mq_hw_ctx
*hctx
= data
;
588 seq_printf(m
, "%lu\n", hctx
->run
);
592 static ssize_t
hctx_run_write(void *data
, const char __user
*buf
, size_t count
,
595 struct blk_mq_hw_ctx
*hctx
= data
;
601 static int hctx_active_show(void *data
, struct seq_file
*m
)
603 struct blk_mq_hw_ctx
*hctx
= data
;
605 seq_printf(m
, "%d\n", atomic_read(&hctx
->nr_active
));
609 static void *ctx_rq_list_start(struct seq_file
*m
, loff_t
*pos
)
610 __acquires(&ctx
->lock
)
612 struct blk_mq_ctx
*ctx
= m
->private;
614 spin_lock(&ctx
->lock
);
615 return seq_list_start(&ctx
->rq_list
, *pos
);
618 static void *ctx_rq_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
620 struct blk_mq_ctx
*ctx
= m
->private;
622 return seq_list_next(v
, &ctx
->rq_list
, pos
);
625 static void ctx_rq_list_stop(struct seq_file
*m
, void *v
)
626 __releases(&ctx
->lock
)
628 struct blk_mq_ctx
*ctx
= m
->private;
630 spin_unlock(&ctx
->lock
);
633 static const struct seq_operations ctx_rq_list_seq_ops
= {
634 .start
= ctx_rq_list_start
,
635 .next
= ctx_rq_list_next
,
636 .stop
= ctx_rq_list_stop
,
637 .show
= blk_mq_debugfs_rq_show
,
639 static int ctx_dispatched_show(void *data
, struct seq_file
*m
)
641 struct blk_mq_ctx
*ctx
= data
;
643 seq_printf(m
, "%lu %lu\n", ctx
->rq_dispatched
[1], ctx
->rq_dispatched
[0]);
647 static ssize_t
ctx_dispatched_write(void *data
, const char __user
*buf
,
648 size_t count
, loff_t
*ppos
)
650 struct blk_mq_ctx
*ctx
= data
;
652 ctx
->rq_dispatched
[0] = ctx
->rq_dispatched
[1] = 0;
656 static int ctx_merged_show(void *data
, struct seq_file
*m
)
658 struct blk_mq_ctx
*ctx
= data
;
660 seq_printf(m
, "%lu\n", ctx
->rq_merged
);
664 static ssize_t
ctx_merged_write(void *data
, const char __user
*buf
,
665 size_t count
, loff_t
*ppos
)
667 struct blk_mq_ctx
*ctx
= data
;
673 static int ctx_completed_show(void *data
, struct seq_file
*m
)
675 struct blk_mq_ctx
*ctx
= data
;
677 seq_printf(m
, "%lu %lu\n", ctx
->rq_completed
[1], ctx
->rq_completed
[0]);
681 static ssize_t
ctx_completed_write(void *data
, const char __user
*buf
,
682 size_t count
, loff_t
*ppos
)
684 struct blk_mq_ctx
*ctx
= data
;
686 ctx
->rq_completed
[0] = ctx
->rq_completed
[1] = 0;
690 static int blk_mq_debugfs_show(struct seq_file
*m
, void *v
)
692 const struct blk_mq_debugfs_attr
*attr
= m
->private;
693 void *data
= d_inode(m
->file
->f_path
.dentry
->d_parent
)->i_private
;
695 return attr
->show(data
, m
);
698 static ssize_t
blk_mq_debugfs_write(struct file
*file
, const char __user
*buf
,
699 size_t count
, loff_t
*ppos
)
701 struct seq_file
*m
= file
->private_data
;
702 const struct blk_mq_debugfs_attr
*attr
= m
->private;
703 void *data
= d_inode(file
->f_path
.dentry
->d_parent
)->i_private
;
708 return attr
->write(data
, buf
, count
, ppos
);
711 static int blk_mq_debugfs_open(struct inode
*inode
, struct file
*file
)
713 const struct blk_mq_debugfs_attr
*attr
= inode
->i_private
;
714 void *data
= d_inode(file
->f_path
.dentry
->d_parent
)->i_private
;
719 ret
= seq_open(file
, attr
->seq_ops
);
721 m
= file
->private_data
;
727 if (WARN_ON_ONCE(!attr
->show
))
730 return single_open(file
, blk_mq_debugfs_show
, inode
->i_private
);
733 static int blk_mq_debugfs_release(struct inode
*inode
, struct file
*file
)
735 const struct blk_mq_debugfs_attr
*attr
= inode
->i_private
;
738 return single_release(inode
, file
);
740 return seq_release(inode
, file
);
743 static const struct file_operations blk_mq_debugfs_fops
= {
744 .open
= blk_mq_debugfs_open
,
746 .write
= blk_mq_debugfs_write
,
748 .release
= blk_mq_debugfs_release
,
751 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs
[] = {
752 {"poll_stat", 0400, queue_poll_stat_show
},
753 {"requeue_list", 0400, .seq_ops
= &queue_requeue_list_seq_ops
},
754 {"state", 0600, queue_state_show
, queue_state_write
},
755 {"write_hints", 0600, queue_write_hint_show
, queue_write_hint_store
},
759 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs
[] = {
760 {"state", 0400, hctx_state_show
},
761 {"flags", 0400, hctx_flags_show
},
762 {"dispatch", 0400, .seq_ops
= &hctx_dispatch_seq_ops
},
763 {"busy", 0400, hctx_busy_show
},
764 {"ctx_map", 0400, hctx_ctx_map_show
},
765 {"tags", 0400, hctx_tags_show
},
766 {"tags_bitmap", 0400, hctx_tags_bitmap_show
},
767 {"sched_tags", 0400, hctx_sched_tags_show
},
768 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show
},
769 {"io_poll", 0600, hctx_io_poll_show
, hctx_io_poll_write
},
770 {"dispatched", 0600, hctx_dispatched_show
, hctx_dispatched_write
},
771 {"queued", 0600, hctx_queued_show
, hctx_queued_write
},
772 {"run", 0600, hctx_run_show
, hctx_run_write
},
773 {"active", 0400, hctx_active_show
},
777 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs
[] = {
778 {"rq_list", 0400, .seq_ops
= &ctx_rq_list_seq_ops
},
779 {"dispatched", 0600, ctx_dispatched_show
, ctx_dispatched_write
},
780 {"merged", 0600, ctx_merged_show
, ctx_merged_write
},
781 {"completed", 0600, ctx_completed_show
, ctx_completed_write
},
785 static bool debugfs_create_files(struct dentry
*parent
, void *data
,
786 const struct blk_mq_debugfs_attr
*attr
)
788 d_inode(parent
)->i_private
= data
;
790 for (; attr
->name
; attr
++) {
791 if (!debugfs_create_file(attr
->name
, attr
->mode
, parent
,
792 (void *)attr
, &blk_mq_debugfs_fops
))
798 int blk_mq_debugfs_register(struct request_queue
*q
)
800 struct blk_mq_hw_ctx
*hctx
;
803 if (!blk_debugfs_root
)
806 q
->debugfs_dir
= debugfs_create_dir(kobject_name(q
->kobj
.parent
),
811 if (!debugfs_create_files(q
->debugfs_dir
, q
,
812 blk_mq_debugfs_queue_attrs
))
816 * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir
817 * didn't exist yet (because we don't know what to name the directory
818 * until the queue is registered to a gendisk).
820 queue_for_each_hw_ctx(q
, hctx
, i
) {
821 if (!hctx
->debugfs_dir
&& blk_mq_debugfs_register_hctx(q
, hctx
))
823 if (q
->elevator
&& !hctx
->sched_debugfs_dir
&&
824 blk_mq_debugfs_register_sched_hctx(q
, hctx
))
831 blk_mq_debugfs_unregister(q
);
835 void blk_mq_debugfs_unregister(struct request_queue
*q
)
837 debugfs_remove_recursive(q
->debugfs_dir
);
838 q
->sched_debugfs_dir
= NULL
;
839 q
->debugfs_dir
= NULL
;
842 static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx
*hctx
,
843 struct blk_mq_ctx
*ctx
)
845 struct dentry
*ctx_dir
;
848 snprintf(name
, sizeof(name
), "cpu%u", ctx
->cpu
);
849 ctx_dir
= debugfs_create_dir(name
, hctx
->debugfs_dir
);
853 if (!debugfs_create_files(ctx_dir
, ctx
, blk_mq_debugfs_ctx_attrs
))
859 int blk_mq_debugfs_register_hctx(struct request_queue
*q
,
860 struct blk_mq_hw_ctx
*hctx
)
862 struct blk_mq_ctx
*ctx
;
869 snprintf(name
, sizeof(name
), "hctx%u", hctx
->queue_num
);
870 hctx
->debugfs_dir
= debugfs_create_dir(name
, q
->debugfs_dir
);
871 if (!hctx
->debugfs_dir
)
874 if (!debugfs_create_files(hctx
->debugfs_dir
, hctx
,
875 blk_mq_debugfs_hctx_attrs
))
878 hctx_for_each_ctx(hctx
, ctx
, i
) {
879 if (blk_mq_debugfs_register_ctx(hctx
, ctx
))
886 blk_mq_debugfs_unregister_hctx(hctx
);
890 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx
*hctx
)
892 debugfs_remove_recursive(hctx
->debugfs_dir
);
893 hctx
->sched_debugfs_dir
= NULL
;
894 hctx
->debugfs_dir
= NULL
;
897 int blk_mq_debugfs_register_hctxs(struct request_queue
*q
)
899 struct blk_mq_hw_ctx
*hctx
;
902 queue_for_each_hw_ctx(q
, hctx
, i
) {
903 if (blk_mq_debugfs_register_hctx(q
, hctx
))
910 void blk_mq_debugfs_unregister_hctxs(struct request_queue
*q
)
912 struct blk_mq_hw_ctx
*hctx
;
915 queue_for_each_hw_ctx(q
, hctx
, i
)
916 blk_mq_debugfs_unregister_hctx(hctx
);
919 int blk_mq_debugfs_register_sched(struct request_queue
*q
)
921 struct elevator_type
*e
= q
->elevator
->type
;
926 if (!e
->queue_debugfs_attrs
)
929 q
->sched_debugfs_dir
= debugfs_create_dir("sched", q
->debugfs_dir
);
930 if (!q
->sched_debugfs_dir
)
933 if (!debugfs_create_files(q
->sched_debugfs_dir
, q
,
934 e
->queue_debugfs_attrs
))
940 blk_mq_debugfs_unregister_sched(q
);
944 void blk_mq_debugfs_unregister_sched(struct request_queue
*q
)
946 debugfs_remove_recursive(q
->sched_debugfs_dir
);
947 q
->sched_debugfs_dir
= NULL
;
950 int blk_mq_debugfs_register_sched_hctx(struct request_queue
*q
,
951 struct blk_mq_hw_ctx
*hctx
)
953 struct elevator_type
*e
= q
->elevator
->type
;
955 if (!hctx
->debugfs_dir
)
958 if (!e
->hctx_debugfs_attrs
)
961 hctx
->sched_debugfs_dir
= debugfs_create_dir("sched",
963 if (!hctx
->sched_debugfs_dir
)
966 if (!debugfs_create_files(hctx
->sched_debugfs_dir
, hctx
,
967 e
->hctx_debugfs_attrs
))
973 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx
*hctx
)
975 debugfs_remove_recursive(hctx
->sched_debugfs_dir
);
976 hctx
->sched_debugfs_dir
= NULL
;