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 unsigned int op
= rq
->cmd_flags
& REQ_OP_MASK
;
316 seq_printf(m
, "%p {.op=", rq
);
317 if (op
< ARRAY_SIZE(op_name
) && op_name
[op
])
318 seq_printf(m
, "%s", op_name
[op
]);
320 seq_printf(m
, "%d", op
);
321 seq_puts(m
, ", .cmd_flags=");
322 blk_flags_show(m
, rq
->cmd_flags
& ~REQ_OP_MASK
, cmd_flag_name
,
323 ARRAY_SIZE(cmd_flag_name
));
324 seq_puts(m
, ", .rq_flags=");
325 blk_flags_show(m
, (__force
unsigned int)rq
->rq_flags
, rqf_name
,
326 ARRAY_SIZE(rqf_name
));
327 seq_printf(m
, ", .tag=%d, .internal_tag=%d}\n", rq
->tag
,
332 static void *hctx_dispatch_start(struct seq_file
*m
, loff_t
*pos
)
333 __acquires(&hctx
->lock
)
335 struct blk_mq_hw_ctx
*hctx
= m
->private;
337 spin_lock(&hctx
->lock
);
338 return seq_list_start(&hctx
->dispatch
, *pos
);
341 static void *hctx_dispatch_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
343 struct blk_mq_hw_ctx
*hctx
= m
->private;
345 return seq_list_next(v
, &hctx
->dispatch
, pos
);
348 static void hctx_dispatch_stop(struct seq_file
*m
, void *v
)
349 __releases(&hctx
->lock
)
351 struct blk_mq_hw_ctx
*hctx
= m
->private;
353 spin_unlock(&hctx
->lock
);
356 static const struct seq_operations hctx_dispatch_seq_ops
= {
357 .start
= hctx_dispatch_start
,
358 .next
= hctx_dispatch_next
,
359 .stop
= hctx_dispatch_stop
,
360 .show
= blk_mq_debugfs_rq_show
,
363 static int hctx_dispatch_open(struct inode
*inode
, struct file
*file
)
365 return blk_mq_debugfs_seq_open(inode
, file
, &hctx_dispatch_seq_ops
);
368 static const struct file_operations hctx_dispatch_fops
= {
369 .open
= hctx_dispatch_open
,
372 .release
= seq_release
,
375 static int hctx_ctx_map_show(struct seq_file
*m
, void *v
)
377 struct blk_mq_hw_ctx
*hctx
= m
->private;
379 sbitmap_bitmap_show(&hctx
->ctx_map
, m
);
383 static int hctx_ctx_map_open(struct inode
*inode
, struct file
*file
)
385 return single_open(file
, hctx_ctx_map_show
, inode
->i_private
);
388 static const struct file_operations hctx_ctx_map_fops
= {
389 .open
= hctx_ctx_map_open
,
392 .release
= single_release
,
395 static void blk_mq_debugfs_tags_show(struct seq_file
*m
,
396 struct blk_mq_tags
*tags
)
398 seq_printf(m
, "nr_tags=%u\n", tags
->nr_tags
);
399 seq_printf(m
, "nr_reserved_tags=%u\n", tags
->nr_reserved_tags
);
400 seq_printf(m
, "active_queues=%d\n",
401 atomic_read(&tags
->active_queues
));
403 seq_puts(m
, "\nbitmap_tags:\n");
404 sbitmap_queue_show(&tags
->bitmap_tags
, m
);
406 if (tags
->nr_reserved_tags
) {
407 seq_puts(m
, "\nbreserved_tags:\n");
408 sbitmap_queue_show(&tags
->breserved_tags
, m
);
412 static int hctx_tags_show(struct seq_file
*m
, void *v
)
414 struct blk_mq_hw_ctx
*hctx
= m
->private;
415 struct request_queue
*q
= hctx
->queue
;
418 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
422 blk_mq_debugfs_tags_show(m
, hctx
->tags
);
423 mutex_unlock(&q
->sysfs_lock
);
429 static int hctx_tags_open(struct inode
*inode
, struct file
*file
)
431 return single_open(file
, hctx_tags_show
, inode
->i_private
);
434 static const struct file_operations hctx_tags_fops
= {
435 .open
= hctx_tags_open
,
438 .release
= single_release
,
441 static int hctx_tags_bitmap_show(struct seq_file
*m
, void *v
)
443 struct blk_mq_hw_ctx
*hctx
= m
->private;
444 struct request_queue
*q
= hctx
->queue
;
447 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
451 sbitmap_bitmap_show(&hctx
->tags
->bitmap_tags
.sb
, m
);
452 mutex_unlock(&q
->sysfs_lock
);
458 static int hctx_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
460 return single_open(file
, hctx_tags_bitmap_show
, inode
->i_private
);
463 static const struct file_operations hctx_tags_bitmap_fops
= {
464 .open
= hctx_tags_bitmap_open
,
467 .release
= single_release
,
470 static int hctx_sched_tags_show(struct seq_file
*m
, void *v
)
472 struct blk_mq_hw_ctx
*hctx
= m
->private;
473 struct request_queue
*q
= hctx
->queue
;
476 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
479 if (hctx
->sched_tags
)
480 blk_mq_debugfs_tags_show(m
, hctx
->sched_tags
);
481 mutex_unlock(&q
->sysfs_lock
);
487 static int hctx_sched_tags_open(struct inode
*inode
, struct file
*file
)
489 return single_open(file
, hctx_sched_tags_show
, inode
->i_private
);
492 static const struct file_operations hctx_sched_tags_fops
= {
493 .open
= hctx_sched_tags_open
,
496 .release
= single_release
,
499 static int hctx_sched_tags_bitmap_show(struct seq_file
*m
, void *v
)
501 struct blk_mq_hw_ctx
*hctx
= m
->private;
502 struct request_queue
*q
= hctx
->queue
;
505 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
508 if (hctx
->sched_tags
)
509 sbitmap_bitmap_show(&hctx
->sched_tags
->bitmap_tags
.sb
, m
);
510 mutex_unlock(&q
->sysfs_lock
);
516 static int hctx_sched_tags_bitmap_open(struct inode
*inode
, struct file
*file
)
518 return single_open(file
, hctx_sched_tags_bitmap_show
, inode
->i_private
);
521 static const struct file_operations hctx_sched_tags_bitmap_fops
= {
522 .open
= hctx_sched_tags_bitmap_open
,
525 .release
= single_release
,
528 static int hctx_io_poll_show(struct seq_file
*m
, void *v
)
530 struct blk_mq_hw_ctx
*hctx
= m
->private;
532 seq_printf(m
, "considered=%lu\n", hctx
->poll_considered
);
533 seq_printf(m
, "invoked=%lu\n", hctx
->poll_invoked
);
534 seq_printf(m
, "success=%lu\n", hctx
->poll_success
);
538 static int hctx_io_poll_open(struct inode
*inode
, struct file
*file
)
540 return single_open(file
, hctx_io_poll_show
, inode
->i_private
);
543 static ssize_t
hctx_io_poll_write(struct file
*file
, const char __user
*buf
,
544 size_t count
, loff_t
*ppos
)
546 struct seq_file
*m
= file
->private_data
;
547 struct blk_mq_hw_ctx
*hctx
= m
->private;
549 hctx
->poll_considered
= hctx
->poll_invoked
= hctx
->poll_success
= 0;
553 static const struct file_operations hctx_io_poll_fops
= {
554 .open
= hctx_io_poll_open
,
556 .write
= hctx_io_poll_write
,
558 .release
= single_release
,
561 static int hctx_dispatched_show(struct seq_file
*m
, void *v
)
563 struct blk_mq_hw_ctx
*hctx
= m
->private;
566 seq_printf(m
, "%8u\t%lu\n", 0U, hctx
->dispatched
[0]);
568 for (i
= 1; i
< BLK_MQ_MAX_DISPATCH_ORDER
- 1; i
++) {
569 unsigned int d
= 1U << (i
- 1);
571 seq_printf(m
, "%8u\t%lu\n", d
, hctx
->dispatched
[i
]);
574 seq_printf(m
, "%8u+\t%lu\n", 1U << (i
- 1), hctx
->dispatched
[i
]);
578 static int hctx_dispatched_open(struct inode
*inode
, struct file
*file
)
580 return single_open(file
, hctx_dispatched_show
, inode
->i_private
);
583 static ssize_t
hctx_dispatched_write(struct file
*file
, const char __user
*buf
,
584 size_t count
, loff_t
*ppos
)
586 struct seq_file
*m
= file
->private_data
;
587 struct blk_mq_hw_ctx
*hctx
= m
->private;
590 for (i
= 0; i
< BLK_MQ_MAX_DISPATCH_ORDER
; i
++)
591 hctx
->dispatched
[i
] = 0;
595 static const struct file_operations hctx_dispatched_fops
= {
596 .open
= hctx_dispatched_open
,
598 .write
= hctx_dispatched_write
,
600 .release
= single_release
,
603 static int hctx_queued_show(struct seq_file
*m
, void *v
)
605 struct blk_mq_hw_ctx
*hctx
= m
->private;
607 seq_printf(m
, "%lu\n", hctx
->queued
);
611 static int hctx_queued_open(struct inode
*inode
, struct file
*file
)
613 return single_open(file
, hctx_queued_show
, inode
->i_private
);
616 static ssize_t
hctx_queued_write(struct file
*file
, const char __user
*buf
,
617 size_t count
, loff_t
*ppos
)
619 struct seq_file
*m
= file
->private_data
;
620 struct blk_mq_hw_ctx
*hctx
= m
->private;
626 static const struct file_operations hctx_queued_fops
= {
627 .open
= hctx_queued_open
,
629 .write
= hctx_queued_write
,
631 .release
= single_release
,
634 static int hctx_run_show(struct seq_file
*m
, void *v
)
636 struct blk_mq_hw_ctx
*hctx
= m
->private;
638 seq_printf(m
, "%lu\n", hctx
->run
);
642 static int hctx_run_open(struct inode
*inode
, struct file
*file
)
644 return single_open(file
, hctx_run_show
, inode
->i_private
);
647 static ssize_t
hctx_run_write(struct file
*file
, const char __user
*buf
,
648 size_t count
, loff_t
*ppos
)
650 struct seq_file
*m
= file
->private_data
;
651 struct blk_mq_hw_ctx
*hctx
= m
->private;
657 static const struct file_operations hctx_run_fops
= {
658 .open
= hctx_run_open
,
660 .write
= hctx_run_write
,
662 .release
= single_release
,
665 static int hctx_active_show(struct seq_file
*m
, void *v
)
667 struct blk_mq_hw_ctx
*hctx
= m
->private;
669 seq_printf(m
, "%d\n", atomic_read(&hctx
->nr_active
));
673 static int hctx_active_open(struct inode
*inode
, struct file
*file
)
675 return single_open(file
, hctx_active_show
, inode
->i_private
);
678 static const struct file_operations hctx_active_fops
= {
679 .open
= hctx_active_open
,
682 .release
= single_release
,
685 static void *ctx_rq_list_start(struct seq_file
*m
, loff_t
*pos
)
686 __acquires(&ctx
->lock
)
688 struct blk_mq_ctx
*ctx
= m
->private;
690 spin_lock(&ctx
->lock
);
691 return seq_list_start(&ctx
->rq_list
, *pos
);
694 static void *ctx_rq_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
696 struct blk_mq_ctx
*ctx
= m
->private;
698 return seq_list_next(v
, &ctx
->rq_list
, pos
);
701 static void ctx_rq_list_stop(struct seq_file
*m
, void *v
)
702 __releases(&ctx
->lock
)
704 struct blk_mq_ctx
*ctx
= m
->private;
706 spin_unlock(&ctx
->lock
);
709 static const struct seq_operations ctx_rq_list_seq_ops
= {
710 .start
= ctx_rq_list_start
,
711 .next
= ctx_rq_list_next
,
712 .stop
= ctx_rq_list_stop
,
713 .show
= blk_mq_debugfs_rq_show
,
716 static int ctx_rq_list_open(struct inode
*inode
, struct file
*file
)
718 return blk_mq_debugfs_seq_open(inode
, file
, &ctx_rq_list_seq_ops
);
721 static const struct file_operations ctx_rq_list_fops
= {
722 .open
= ctx_rq_list_open
,
725 .release
= seq_release
,
728 static int ctx_dispatched_show(struct seq_file
*m
, void *v
)
730 struct blk_mq_ctx
*ctx
= m
->private;
732 seq_printf(m
, "%lu %lu\n", ctx
->rq_dispatched
[1], ctx
->rq_dispatched
[0]);
736 static int ctx_dispatched_open(struct inode
*inode
, struct file
*file
)
738 return single_open(file
, ctx_dispatched_show
, inode
->i_private
);
741 static ssize_t
ctx_dispatched_write(struct file
*file
, const char __user
*buf
,
742 size_t count
, loff_t
*ppos
)
744 struct seq_file
*m
= file
->private_data
;
745 struct blk_mq_ctx
*ctx
= m
->private;
747 ctx
->rq_dispatched
[0] = ctx
->rq_dispatched
[1] = 0;
751 static const struct file_operations ctx_dispatched_fops
= {
752 .open
= ctx_dispatched_open
,
754 .write
= ctx_dispatched_write
,
756 .release
= single_release
,
759 static int ctx_merged_show(struct seq_file
*m
, void *v
)
761 struct blk_mq_ctx
*ctx
= m
->private;
763 seq_printf(m
, "%lu\n", ctx
->rq_merged
);
767 static int ctx_merged_open(struct inode
*inode
, struct file
*file
)
769 return single_open(file
, ctx_merged_show
, inode
->i_private
);
772 static ssize_t
ctx_merged_write(struct file
*file
, const char __user
*buf
,
773 size_t count
, loff_t
*ppos
)
775 struct seq_file
*m
= file
->private_data
;
776 struct blk_mq_ctx
*ctx
= m
->private;
782 static const struct file_operations ctx_merged_fops
= {
783 .open
= ctx_merged_open
,
785 .write
= ctx_merged_write
,
787 .release
= single_release
,
790 static int ctx_completed_show(struct seq_file
*m
, void *v
)
792 struct blk_mq_ctx
*ctx
= m
->private;
794 seq_printf(m
, "%lu %lu\n", ctx
->rq_completed
[1], ctx
->rq_completed
[0]);
798 static int ctx_completed_open(struct inode
*inode
, struct file
*file
)
800 return single_open(file
, ctx_completed_show
, inode
->i_private
);
803 static ssize_t
ctx_completed_write(struct file
*file
, const char __user
*buf
,
804 size_t count
, loff_t
*ppos
)
806 struct seq_file
*m
= file
->private_data
;
807 struct blk_mq_ctx
*ctx
= m
->private;
809 ctx
->rq_completed
[0] = ctx
->rq_completed
[1] = 0;
813 static const struct file_operations ctx_completed_fops
= {
814 .open
= ctx_completed_open
,
816 .write
= ctx_completed_write
,
818 .release
= single_release
,
821 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs
[] = {
822 {"poll_stat", 0400, &queue_poll_stat_fops
},
823 {"state", 0600, &blk_queue_flags_fops
},
827 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs
[] = {
828 {"state", 0400, &hctx_state_fops
},
829 {"flags", 0400, &hctx_flags_fops
},
830 {"dispatch", 0400, &hctx_dispatch_fops
},
831 {"ctx_map", 0400, &hctx_ctx_map_fops
},
832 {"tags", 0400, &hctx_tags_fops
},
833 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops
},
834 {"sched_tags", 0400, &hctx_sched_tags_fops
},
835 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops
},
836 {"io_poll", 0600, &hctx_io_poll_fops
},
837 {"dispatched", 0600, &hctx_dispatched_fops
},
838 {"queued", 0600, &hctx_queued_fops
},
839 {"run", 0600, &hctx_run_fops
},
840 {"active", 0400, &hctx_active_fops
},
844 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs
[] = {
845 {"rq_list", 0400, &ctx_rq_list_fops
},
846 {"dispatched", 0600, &ctx_dispatched_fops
},
847 {"merged", 0600, &ctx_merged_fops
},
848 {"completed", 0600, &ctx_completed_fops
},
852 int blk_mq_debugfs_register(struct request_queue
*q
)
854 if (!blk_debugfs_root
)
857 q
->debugfs_dir
= debugfs_create_dir(kobject_name(q
->kobj
.parent
),
862 if (blk_mq_debugfs_register_mq(q
))
868 blk_mq_debugfs_unregister(q
);
872 void blk_mq_debugfs_unregister(struct request_queue
*q
)
874 debugfs_remove_recursive(q
->debugfs_dir
);
875 q
->mq_debugfs_dir
= NULL
;
876 q
->debugfs_dir
= NULL
;
879 static bool debugfs_create_files(struct dentry
*parent
, void *data
,
880 const struct blk_mq_debugfs_attr
*attr
)
882 for (; attr
->name
; attr
++) {
883 if (!debugfs_create_file(attr
->name
, attr
->mode
, parent
,
890 static int blk_mq_debugfs_register_ctx(struct request_queue
*q
,
891 struct blk_mq_ctx
*ctx
,
892 struct dentry
*hctx_dir
)
894 struct dentry
*ctx_dir
;
897 snprintf(name
, sizeof(name
), "cpu%u", ctx
->cpu
);
898 ctx_dir
= debugfs_create_dir(name
, hctx_dir
);
902 if (!debugfs_create_files(ctx_dir
, ctx
, blk_mq_debugfs_ctx_attrs
))
908 static int blk_mq_debugfs_register_hctx(struct request_queue
*q
,
909 struct blk_mq_hw_ctx
*hctx
)
911 struct blk_mq_ctx
*ctx
;
912 struct dentry
*hctx_dir
;
916 snprintf(name
, sizeof(name
), "%u", hctx
->queue_num
);
917 hctx_dir
= debugfs_create_dir(name
, q
->mq_debugfs_dir
);
921 if (!debugfs_create_files(hctx_dir
, hctx
, blk_mq_debugfs_hctx_attrs
))
924 hctx_for_each_ctx(hctx
, ctx
, i
) {
925 if (blk_mq_debugfs_register_ctx(q
, ctx
, hctx_dir
))
932 int blk_mq_debugfs_register_mq(struct request_queue
*q
)
934 struct blk_mq_hw_ctx
*hctx
;
940 q
->mq_debugfs_dir
= debugfs_create_dir("mq", q
->debugfs_dir
);
941 if (!q
->mq_debugfs_dir
)
944 if (!debugfs_create_files(q
->mq_debugfs_dir
, q
, blk_mq_debugfs_queue_attrs
))
947 queue_for_each_hw_ctx(q
, hctx
, i
) {
948 if (blk_mq_debugfs_register_hctx(q
, hctx
))
955 blk_mq_debugfs_unregister_mq(q
);
959 void blk_mq_debugfs_unregister_mq(struct request_queue
*q
)
961 debugfs_remove_recursive(q
->mq_debugfs_dir
);
962 q
->mq_debugfs_dir
= NULL
;