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 const char *const op_name
[] = {
257 [REQ_OP_READ
] = "READ",
258 [REQ_OP_WRITE
] = "WRITE",
259 [REQ_OP_FLUSH
] = "FLUSH",
260 [REQ_OP_DISCARD
] = "DISCARD",
261 [REQ_OP_ZONE_REPORT
] = "ZONE_REPORT",
262 [REQ_OP_SECURE_ERASE
] = "SECURE_ERASE",
263 [REQ_OP_ZONE_RESET
] = "ZONE_RESET",
264 [REQ_OP_WRITE_SAME
] = "WRITE_SAME",
265 [REQ_OP_WRITE_ZEROES
] = "WRITE_ZEROES",
266 [REQ_OP_SCSI_IN
] = "SCSI_IN",
267 [REQ_OP_SCSI_OUT
] = "SCSI_OUT",
268 [REQ_OP_DRV_IN
] = "DRV_IN",
269 [REQ_OP_DRV_OUT
] = "DRV_OUT",
272 static const char *const cmd_flag_name
[] = {
273 [__REQ_FAILFAST_DEV
] = "FAILFAST_DEV",
274 [__REQ_FAILFAST_TRANSPORT
] = "FAILFAST_TRANSPORT",
275 [__REQ_FAILFAST_DRIVER
] = "FAILFAST_DRIVER",
276 [__REQ_SYNC
] = "SYNC",
277 [__REQ_META
] = "META",
278 [__REQ_PRIO
] = "PRIO",
279 [__REQ_NOMERGE
] = "NOMERGE",
280 [__REQ_IDLE
] = "IDLE",
281 [__REQ_INTEGRITY
] = "INTEGRITY",
283 [__REQ_PREFLUSH
] = "PREFLUSH",
284 [__REQ_RAHEAD
] = "RAHEAD",
285 [__REQ_BACKGROUND
] = "BACKGROUND",
286 [__REQ_NR_BITS
] = "NR_BITS",
289 static const char *const rqf_name
[] = {
290 [ilog2((__force u32
)RQF_SORTED
)] = "SORTED",
291 [ilog2((__force u32
)RQF_STARTED
)] = "STARTED",
292 [ilog2((__force u32
)RQF_QUEUED
)] = "QUEUED",
293 [ilog2((__force u32
)RQF_SOFTBARRIER
)] = "SOFTBARRIER",
294 [ilog2((__force u32
)RQF_FLUSH_SEQ
)] = "FLUSH_SEQ",
295 [ilog2((__force u32
)RQF_MIXED_MERGE
)] = "MIXED_MERGE",
296 [ilog2((__force u32
)RQF_MQ_INFLIGHT
)] = "MQ_INFLIGHT",
297 [ilog2((__force u32
)RQF_DONTPREP
)] = "DONTPREP",
298 [ilog2((__force u32
)RQF_PREEMPT
)] = "PREEMPT",
299 [ilog2((__force u32
)RQF_COPY_USER
)] = "COPY_USER",
300 [ilog2((__force u32
)RQF_FAILED
)] = "FAILED",
301 [ilog2((__force u32
)RQF_QUIET
)] = "QUIET",
302 [ilog2((__force u32
)RQF_ELVPRIV
)] = "ELVPRIV",
303 [ilog2((__force u32
)RQF_IO_STAT
)] = "IO_STAT",
304 [ilog2((__force u32
)RQF_ALLOCED
)] = "ALLOCED",
305 [ilog2((__force u32
)RQF_PM
)] = "PM",
306 [ilog2((__force u32
)RQF_HASHED
)] = "HASHED",
307 [ilog2((__force u32
)RQF_STATS
)] = "STATS",
308 [ilog2((__force u32
)RQF_SPECIAL_PAYLOAD
)] = "SPECIAL_PAYLOAD",
311 static int blk_mq_debugfs_rq_show(struct seq_file
*m
, void *v
)
313 struct request
*rq
= list_entry_rq(v
);
314 const struct blk_mq_ops
*const mq_ops
= rq
->q
->mq_ops
;
315 const unsigned int op
= rq
->cmd_flags
& REQ_OP_MASK
;
317 seq_printf(m
, "%p {.op=", rq
);
318 if (op
< ARRAY_SIZE(op_name
) && op_name
[op
])
319 seq_printf(m
, "%s", op_name
[op
]);
321 seq_printf(m
, "%d", op
);
322 seq_puts(m
, ", .cmd_flags=");
323 blk_flags_show(m
, rq
->cmd_flags
& ~REQ_OP_MASK
, cmd_flag_name
,
324 ARRAY_SIZE(cmd_flag_name
));
325 seq_puts(m
, ", .rq_flags=");
326 blk_flags_show(m
, (__force
unsigned int)rq
->rq_flags
, rqf_name
,
327 ARRAY_SIZE(rqf_name
));
328 seq_printf(m
, ", .tag=%d, .internal_tag=%d", rq
->tag
,
331 mq_ops
->show_rq(m
, rq
);
336 static void *hctx_dispatch_start(struct seq_file
*m
, loff_t
*pos
)
337 __acquires(&hctx
->lock
)
339 struct blk_mq_hw_ctx
*hctx
= m
->private;
341 spin_lock(&hctx
->lock
);
342 return seq_list_start(&hctx
->dispatch
, *pos
);
345 static void *hctx_dispatch_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
347 struct blk_mq_hw_ctx
*hctx
= m
->private;
349 return seq_list_next(v
, &hctx
->dispatch
, pos
);
352 static void hctx_dispatch_stop(struct seq_file
*m
, void *v
)
353 __releases(&hctx
->lock
)
355 struct blk_mq_hw_ctx
*hctx
= m
->private;
357 spin_unlock(&hctx
->lock
);
360 static const struct seq_operations hctx_dispatch_seq_ops
= {
361 .start
= hctx_dispatch_start
,
362 .next
= hctx_dispatch_next
,
363 .stop
= hctx_dispatch_stop
,
364 .show
= blk_mq_debugfs_rq_show
,
367 static int hctx_dispatch_open(struct inode
*inode
, struct file
*file
)
369 return blk_mq_debugfs_seq_open(inode
, file
, &hctx_dispatch_seq_ops
);
372 static const struct file_operations hctx_dispatch_fops
= {
373 .open
= hctx_dispatch_open
,
376 .release
= seq_release
,
379 static int hctx_ctx_map_show(struct seq_file
*m
, void *v
)
381 struct blk_mq_hw_ctx
*hctx
= m
->private;
383 sbitmap_bitmap_show(&hctx
->ctx_map
, m
);
387 static int hctx_ctx_map_open(struct inode
*inode
, struct file
*file
)
389 return single_open(file
, hctx_ctx_map_show
, inode
->i_private
);
392 static const struct file_operations hctx_ctx_map_fops
= {
393 .open
= hctx_ctx_map_open
,
396 .release
= single_release
,
399 static void blk_mq_debugfs_tags_show(struct seq_file
*m
,
400 struct blk_mq_tags
*tags
)
402 seq_printf(m
, "nr_tags=%u\n", tags
->nr_tags
);
403 seq_printf(m
, "nr_reserved_tags=%u\n", tags
->nr_reserved_tags
);
404 seq_printf(m
, "active_queues=%d\n",
405 atomic_read(&tags
->active_queues
));
407 seq_puts(m
, "\nbitmap_tags:\n");
408 sbitmap_queue_show(&tags
->bitmap_tags
, m
);
410 if (tags
->nr_reserved_tags
) {
411 seq_puts(m
, "\nbreserved_tags:\n");
412 sbitmap_queue_show(&tags
->breserved_tags
, m
);
416 static int hctx_tags_show(struct seq_file
*m
, void *v
)
418 struct blk_mq_hw_ctx
*hctx
= m
->private;
419 struct request_queue
*q
= hctx
->queue
;
422 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
426 blk_mq_debugfs_tags_show(m
, hctx
->tags
);
427 mutex_unlock(&q
->sysfs_lock
);
433 static int hctx_tags_open(struct inode
*inode
, struct file
*file
)
435 return single_open(file
, hctx_tags_show
, inode
->i_private
);
438 static const struct file_operations hctx_tags_fops
= {
439 .open
= hctx_tags_open
,
442 .release
= single_release
,
445 static int hctx_tags_bitmap_show(struct seq_file
*m
, void *v
)
447 struct blk_mq_hw_ctx
*hctx
= m
->private;
448 struct request_queue
*q
= hctx
->queue
;
451 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
455 sbitmap_bitmap_show(&hctx
->tags
->bitmap_tags
.sb
, m
);
456 mutex_unlock(&q
->sysfs_lock
);
462 static int hctx_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
464 return single_open(file
, hctx_tags_bitmap_show
, inode
->i_private
);
467 static const struct file_operations hctx_tags_bitmap_fops
= {
468 .open
= hctx_tags_bitmap_open
,
471 .release
= single_release
,
474 static int hctx_sched_tags_show(struct seq_file
*m
, void *v
)
476 struct blk_mq_hw_ctx
*hctx
= m
->private;
477 struct request_queue
*q
= hctx
->queue
;
480 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
483 if (hctx
->sched_tags
)
484 blk_mq_debugfs_tags_show(m
, hctx
->sched_tags
);
485 mutex_unlock(&q
->sysfs_lock
);
491 static int hctx_sched_tags_open(struct inode
*inode
, struct file
*file
)
493 return single_open(file
, hctx_sched_tags_show
, inode
->i_private
);
496 static const struct file_operations hctx_sched_tags_fops
= {
497 .open
= hctx_sched_tags_open
,
500 .release
= single_release
,
503 static int hctx_sched_tags_bitmap_show(struct seq_file
*m
, void *v
)
505 struct blk_mq_hw_ctx
*hctx
= m
->private;
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_sched_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
522 return single_open(file
, hctx_sched_tags_bitmap_show
, inode
->i_private
);
525 static const struct file_operations hctx_sched_tags_bitmap_fops
= {
526 .open
= hctx_sched_tags_bitmap_open
,
529 .release
= single_release
,
532 static int hctx_io_poll_show(struct seq_file
*m
, void *v
)
534 struct blk_mq_hw_ctx
*hctx
= m
->private;
536 seq_printf(m
, "considered=%lu\n", hctx
->poll_considered
);
537 seq_printf(m
, "invoked=%lu\n", hctx
->poll_invoked
);
538 seq_printf(m
, "success=%lu\n", hctx
->poll_success
);
542 static int hctx_io_poll_open(struct inode
*inode
, struct file
*file
)
544 return single_open(file
, hctx_io_poll_show
, inode
->i_private
);
547 static ssize_t
hctx_io_poll_write(struct file
*file
, const char __user
*buf
,
548 size_t count
, loff_t
*ppos
)
550 struct seq_file
*m
= file
->private_data
;
551 struct blk_mq_hw_ctx
*hctx
= m
->private;
553 hctx
->poll_considered
= hctx
->poll_invoked
= hctx
->poll_success
= 0;
557 static const struct file_operations hctx_io_poll_fops
= {
558 .open
= hctx_io_poll_open
,
560 .write
= hctx_io_poll_write
,
562 .release
= single_release
,
565 static int hctx_dispatched_show(struct seq_file
*m
, void *v
)
567 struct blk_mq_hw_ctx
*hctx
= m
->private;
570 seq_printf(m
, "%8u\t%lu\n", 0U, hctx
->dispatched
[0]);
572 for (i
= 1; i
< BLK_MQ_MAX_DISPATCH_ORDER
- 1; i
++) {
573 unsigned int d
= 1U << (i
- 1);
575 seq_printf(m
, "%8u\t%lu\n", d
, hctx
->dispatched
[i
]);
578 seq_printf(m
, "%8u+\t%lu\n", 1U << (i
- 1), hctx
->dispatched
[i
]);
582 static int hctx_dispatched_open(struct inode
*inode
, struct file
*file
)
584 return single_open(file
, hctx_dispatched_show
, inode
->i_private
);
587 static ssize_t
hctx_dispatched_write(struct file
*file
, const char __user
*buf
,
588 size_t count
, loff_t
*ppos
)
590 struct seq_file
*m
= file
->private_data
;
591 struct blk_mq_hw_ctx
*hctx
= m
->private;
594 for (i
= 0; i
< BLK_MQ_MAX_DISPATCH_ORDER
; i
++)
595 hctx
->dispatched
[i
] = 0;
599 static const struct file_operations hctx_dispatched_fops
= {
600 .open
= hctx_dispatched_open
,
602 .write
= hctx_dispatched_write
,
604 .release
= single_release
,
607 static int hctx_queued_show(struct seq_file
*m
, void *v
)
609 struct blk_mq_hw_ctx
*hctx
= m
->private;
611 seq_printf(m
, "%lu\n", hctx
->queued
);
615 static int hctx_queued_open(struct inode
*inode
, struct file
*file
)
617 return single_open(file
, hctx_queued_show
, inode
->i_private
);
620 static ssize_t
hctx_queued_write(struct file
*file
, const char __user
*buf
,
621 size_t count
, loff_t
*ppos
)
623 struct seq_file
*m
= file
->private_data
;
624 struct blk_mq_hw_ctx
*hctx
= m
->private;
630 static const struct file_operations hctx_queued_fops
= {
631 .open
= hctx_queued_open
,
633 .write
= hctx_queued_write
,
635 .release
= single_release
,
638 static int hctx_run_show(struct seq_file
*m
, void *v
)
640 struct blk_mq_hw_ctx
*hctx
= m
->private;
642 seq_printf(m
, "%lu\n", hctx
->run
);
646 static int hctx_run_open(struct inode
*inode
, struct file
*file
)
648 return single_open(file
, hctx_run_show
, inode
->i_private
);
651 static ssize_t
hctx_run_write(struct file
*file
, const char __user
*buf
,
652 size_t count
, loff_t
*ppos
)
654 struct seq_file
*m
= file
->private_data
;
655 struct blk_mq_hw_ctx
*hctx
= m
->private;
661 static const struct file_operations hctx_run_fops
= {
662 .open
= hctx_run_open
,
664 .write
= hctx_run_write
,
666 .release
= single_release
,
669 static int hctx_active_show(struct seq_file
*m
, void *v
)
671 struct blk_mq_hw_ctx
*hctx
= m
->private;
673 seq_printf(m
, "%d\n", atomic_read(&hctx
->nr_active
));
677 static int hctx_active_open(struct inode
*inode
, struct file
*file
)
679 return single_open(file
, hctx_active_show
, inode
->i_private
);
682 static const struct file_operations hctx_active_fops
= {
683 .open
= hctx_active_open
,
686 .release
= single_release
,
689 static void *ctx_rq_list_start(struct seq_file
*m
, loff_t
*pos
)
690 __acquires(&ctx
->lock
)
692 struct blk_mq_ctx
*ctx
= m
->private;
694 spin_lock(&ctx
->lock
);
695 return seq_list_start(&ctx
->rq_list
, *pos
);
698 static void *ctx_rq_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
700 struct blk_mq_ctx
*ctx
= m
->private;
702 return seq_list_next(v
, &ctx
->rq_list
, pos
);
705 static void ctx_rq_list_stop(struct seq_file
*m
, void *v
)
706 __releases(&ctx
->lock
)
708 struct blk_mq_ctx
*ctx
= m
->private;
710 spin_unlock(&ctx
->lock
);
713 static const struct seq_operations ctx_rq_list_seq_ops
= {
714 .start
= ctx_rq_list_start
,
715 .next
= ctx_rq_list_next
,
716 .stop
= ctx_rq_list_stop
,
717 .show
= blk_mq_debugfs_rq_show
,
720 static int ctx_rq_list_open(struct inode
*inode
, struct file
*file
)
722 return blk_mq_debugfs_seq_open(inode
, file
, &ctx_rq_list_seq_ops
);
725 static const struct file_operations ctx_rq_list_fops
= {
726 .open
= ctx_rq_list_open
,
729 .release
= seq_release
,
732 static int ctx_dispatched_show(struct seq_file
*m
, void *v
)
734 struct blk_mq_ctx
*ctx
= m
->private;
736 seq_printf(m
, "%lu %lu\n", ctx
->rq_dispatched
[1], ctx
->rq_dispatched
[0]);
740 static int ctx_dispatched_open(struct inode
*inode
, struct file
*file
)
742 return single_open(file
, ctx_dispatched_show
, inode
->i_private
);
745 static ssize_t
ctx_dispatched_write(struct file
*file
, const char __user
*buf
,
746 size_t count
, loff_t
*ppos
)
748 struct seq_file
*m
= file
->private_data
;
749 struct blk_mq_ctx
*ctx
= m
->private;
751 ctx
->rq_dispatched
[0] = ctx
->rq_dispatched
[1] = 0;
755 static const struct file_operations ctx_dispatched_fops
= {
756 .open
= ctx_dispatched_open
,
758 .write
= ctx_dispatched_write
,
760 .release
= single_release
,
763 static int ctx_merged_show(struct seq_file
*m
, void *v
)
765 struct blk_mq_ctx
*ctx
= m
->private;
767 seq_printf(m
, "%lu\n", ctx
->rq_merged
);
771 static int ctx_merged_open(struct inode
*inode
, struct file
*file
)
773 return single_open(file
, ctx_merged_show
, inode
->i_private
);
776 static ssize_t
ctx_merged_write(struct file
*file
, const char __user
*buf
,
777 size_t count
, loff_t
*ppos
)
779 struct seq_file
*m
= file
->private_data
;
780 struct blk_mq_ctx
*ctx
= m
->private;
786 static const struct file_operations ctx_merged_fops
= {
787 .open
= ctx_merged_open
,
789 .write
= ctx_merged_write
,
791 .release
= single_release
,
794 static int ctx_completed_show(struct seq_file
*m
, void *v
)
796 struct blk_mq_ctx
*ctx
= m
->private;
798 seq_printf(m
, "%lu %lu\n", ctx
->rq_completed
[1], ctx
->rq_completed
[0]);
802 static int ctx_completed_open(struct inode
*inode
, struct file
*file
)
804 return single_open(file
, ctx_completed_show
, inode
->i_private
);
807 static ssize_t
ctx_completed_write(struct file
*file
, const char __user
*buf
,
808 size_t count
, loff_t
*ppos
)
810 struct seq_file
*m
= file
->private_data
;
811 struct blk_mq_ctx
*ctx
= m
->private;
813 ctx
->rq_completed
[0] = ctx
->rq_completed
[1] = 0;
817 static const struct file_operations ctx_completed_fops
= {
818 .open
= ctx_completed_open
,
820 .write
= ctx_completed_write
,
822 .release
= single_release
,
825 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs
[] = {
826 {"poll_stat", 0400, &queue_poll_stat_fops
},
827 {"state", 0600, &blk_queue_flags_fops
},
831 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs
[] = {
832 {"state", 0400, &hctx_state_fops
},
833 {"flags", 0400, &hctx_flags_fops
},
834 {"dispatch", 0400, &hctx_dispatch_fops
},
835 {"ctx_map", 0400, &hctx_ctx_map_fops
},
836 {"tags", 0400, &hctx_tags_fops
},
837 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops
},
838 {"sched_tags", 0400, &hctx_sched_tags_fops
},
839 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops
},
840 {"io_poll", 0600, &hctx_io_poll_fops
},
841 {"dispatched", 0600, &hctx_dispatched_fops
},
842 {"queued", 0600, &hctx_queued_fops
},
843 {"run", 0600, &hctx_run_fops
},
844 {"active", 0400, &hctx_active_fops
},
848 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs
[] = {
849 {"rq_list", 0400, &ctx_rq_list_fops
},
850 {"dispatched", 0600, &ctx_dispatched_fops
},
851 {"merged", 0600, &ctx_merged_fops
},
852 {"completed", 0600, &ctx_completed_fops
},
856 int blk_mq_debugfs_register(struct request_queue
*q
)
858 if (!blk_debugfs_root
)
861 q
->debugfs_dir
= debugfs_create_dir(kobject_name(q
->kobj
.parent
),
866 if (blk_mq_debugfs_register_mq(q
))
872 blk_mq_debugfs_unregister(q
);
876 void blk_mq_debugfs_unregister(struct request_queue
*q
)
878 debugfs_remove_recursive(q
->debugfs_dir
);
879 q
->mq_debugfs_dir
= NULL
;
880 q
->debugfs_dir
= NULL
;
883 static bool debugfs_create_files(struct dentry
*parent
, void *data
,
884 const struct blk_mq_debugfs_attr
*attr
)
886 for (; attr
->name
; attr
++) {
887 if (!debugfs_create_file(attr
->name
, attr
->mode
, parent
,
894 static int blk_mq_debugfs_register_ctx(struct request_queue
*q
,
895 struct blk_mq_ctx
*ctx
,
896 struct dentry
*hctx_dir
)
898 struct dentry
*ctx_dir
;
901 snprintf(name
, sizeof(name
), "cpu%u", ctx
->cpu
);
902 ctx_dir
= debugfs_create_dir(name
, hctx_dir
);
906 if (!debugfs_create_files(ctx_dir
, ctx
, blk_mq_debugfs_ctx_attrs
))
912 static int blk_mq_debugfs_register_hctx(struct request_queue
*q
,
913 struct blk_mq_hw_ctx
*hctx
)
915 struct blk_mq_ctx
*ctx
;
916 struct dentry
*hctx_dir
;
920 snprintf(name
, sizeof(name
), "%u", hctx
->queue_num
);
921 hctx_dir
= debugfs_create_dir(name
, q
->mq_debugfs_dir
);
925 if (!debugfs_create_files(hctx_dir
, hctx
, blk_mq_debugfs_hctx_attrs
))
928 hctx_for_each_ctx(hctx
, ctx
, i
) {
929 if (blk_mq_debugfs_register_ctx(q
, ctx
, hctx_dir
))
936 int blk_mq_debugfs_register_mq(struct request_queue
*q
)
938 struct blk_mq_hw_ctx
*hctx
;
944 q
->mq_debugfs_dir
= debugfs_create_dir("mq", q
->debugfs_dir
);
945 if (!q
->mq_debugfs_dir
)
948 if (!debugfs_create_files(q
->mq_debugfs_dir
, q
, blk_mq_debugfs_queue_attrs
))
951 queue_for_each_hw_ctx(q
, hctx
, i
) {
952 if (blk_mq_debugfs_register_hctx(q
, hctx
))
959 blk_mq_debugfs_unregister_mq(q
);
963 void blk_mq_debugfs_unregister_mq(struct request_queue
*q
)
965 debugfs_remove_recursive(q
->mq_debugfs_dir
);
966 q
->mq_debugfs_dir
= NULL
;