Merge tag 'arm-soc-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[linux-block.git] / block / blk-mq-debugfs.c
CommitLineData
8c16567d 1// SPDX-License-Identifier: GPL-2.0
07e4fead
OS
2/*
3 * Copyright (C) 2017 Facebook
07e4fead
OS
4 */
5
6#include <linux/kernel.h>
7#include <linux/blkdev.h>
8#include <linux/debugfs.h>
9
10#include <linux/blk-mq.h>
18fbda91 11#include "blk.h"
07e4fead 12#include "blk-mq.h"
d173a251 13#include "blk-mq-debugfs.h"
2aa7745b 14#include "blk-mq-sched.h"
d96b37c0 15#include "blk-mq-tag.h"
cc56694f 16#include "blk-rq-qos.h"
07e4fead 17
1209cb7f
BVA
18static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
19{
20 if (stat->nr_samples) {
315eb656 21 seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu",
1209cb7f
BVA
22 stat->nr_samples, stat->mean, stat->min, stat->max);
23 } else {
24 seq_puts(m, "samples=0");
25 }
26}
27
28static int queue_poll_stat_show(void *data, struct seq_file *m)
29{
30 struct request_queue *q = data;
31 int bucket;
32
18d78171
ML
33 if (!q->poll_stat)
34 return 0;
35
243d9f78
CK
36 for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) {
37 seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket));
38 print_stat(m, &q->poll_stat[2 * bucket]);
1209cb7f
BVA
39 seq_puts(m, "\n");
40
243d9f78
CK
41 seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket));
42 print_stat(m, &q->poll_stat[2 * bucket + 1]);
1209cb7f
BVA
43 seq_puts(m, "\n");
44 }
45 return 0;
46}
47
48static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
49 __acquires(&q->requeue_lock)
50{
51 struct request_queue *q = m->private;
52
53 spin_lock_irq(&q->requeue_lock);
54 return seq_list_start(&q->requeue_list, *pos);
55}
56
57static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
58{
59 struct request_queue *q = m->private;
60
61 return seq_list_next(v, &q->requeue_list, pos);
62}
63
64static void queue_requeue_list_stop(struct seq_file *m, void *v)
65 __releases(&q->requeue_lock)
66{
67 struct request_queue *q = m->private;
68
69 spin_unlock_irq(&q->requeue_lock);
70}
71
72static const struct seq_operations queue_requeue_list_seq_ops = {
73 .start = queue_requeue_list_start,
74 .next = queue_requeue_list_next,
75 .stop = queue_requeue_list_stop,
76 .show = blk_mq_debugfs_rq_show,
77};
78
91d68905
BVA
79static int blk_flags_show(struct seq_file *m, const unsigned long flags,
80 const char *const *flag_name, int flag_name_count)
81{
82 bool sep = false;
83 int i;
84
85 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
86 if (!(flags & BIT(i)))
87 continue;
88 if (sep)
bec03d6b 89 seq_puts(m, "|");
91d68905
BVA
90 sep = true;
91 if (i < flag_name_count && flag_name[i])
92 seq_puts(m, flag_name[i]);
93 else
94 seq_printf(m, "%d", i);
95 }
91d68905
BVA
96 return 0;
97}
98
cd84a62e
BVA
99static int queue_pm_only_show(void *data, struct seq_file *m)
100{
101 struct request_queue *q = data;
102
103 seq_printf(m, "%d\n", atomic_read(&q->pm_only));
104 return 0;
105}
106
1a435111 107#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
91d68905 108static const char *const blk_queue_flag_name[] = {
1a435111 109 QUEUE_FLAG_NAME(STOPPED),
1a435111 110 QUEUE_FLAG_NAME(DYING),
1a435111
OS
111 QUEUE_FLAG_NAME(NOMERGES),
112 QUEUE_FLAG_NAME(SAME_COMP),
113 QUEUE_FLAG_NAME(FAIL_IO),
1a435111
OS
114 QUEUE_FLAG_NAME(NONROT),
115 QUEUE_FLAG_NAME(IO_STAT),
1a435111
OS
116 QUEUE_FLAG_NAME(NOXMERGES),
117 QUEUE_FLAG_NAME(ADD_RANDOM),
1a435111
OS
118 QUEUE_FLAG_NAME(SAME_FORCE),
119 QUEUE_FLAG_NAME(DEAD),
120 QUEUE_FLAG_NAME(INIT_DONE),
1cb039f3 121 QUEUE_FLAG_NAME(STABLE_WRITES),
1a435111
OS
122 QUEUE_FLAG_NAME(POLL),
123 QUEUE_FLAG_NAME(WC),
124 QUEUE_FLAG_NAME(FUA),
1a435111
OS
125 QUEUE_FLAG_NAME(DAX),
126 QUEUE_FLAG_NAME(STATS),
1a435111 127 QUEUE_FLAG_NAME(REGISTERED),
22d53821 128 QUEUE_FLAG_NAME(QUIESCED),
bfe373f6
HT
129 QUEUE_FLAG_NAME(PCI_P2PDMA),
130 QUEUE_FLAG_NAME(ZONE_RESETALL),
131 QUEUE_FLAG_NAME(RQ_ALLOC_TIME),
1dbdd99b 132 QUEUE_FLAG_NAME(HCTX_ACTIVE),
dc304326 133 QUEUE_FLAG_NAME(NOWAIT),
91d68905 134};
1a435111 135#undef QUEUE_FLAG_NAME
91d68905 136
f57de23a 137static int queue_state_show(void *data, struct seq_file *m)
91d68905 138{
f57de23a 139 struct request_queue *q = data;
91d68905
BVA
140
141 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
142 ARRAY_SIZE(blk_queue_flag_name));
fd07dc81 143 seq_puts(m, "\n");
91d68905
BVA
144 return 0;
145}
146
f57de23a
OS
147static ssize_t queue_state_write(void *data, const char __user *buf,
148 size_t count, loff_t *ppos)
91d68905 149{
f57de23a 150 struct request_queue *q = data;
71b90511 151 char opbuf[16] = { }, *op;
91d68905 152
18d4d7d0
BVA
153 /*
154 * The "state" attribute is removed after blk_cleanup_queue() has called
155 * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
156 * triggering a use-after-free.
157 */
158 if (blk_queue_dead(q))
159 return -ENOENT;
160
71b90511 161 if (count >= sizeof(opbuf)) {
c7e4145a
OS
162 pr_err("%s: operation too long\n", __func__);
163 goto inval;
164 }
165
71b90511 166 if (copy_from_user(opbuf, buf, count))
91d68905 167 return -EFAULT;
71b90511 168 op = strstrip(opbuf);
91d68905
BVA
169 if (strcmp(op, "run") == 0) {
170 blk_mq_run_hw_queues(q, true);
171 } else if (strcmp(op, "start") == 0) {
172 blk_mq_start_stopped_hw_queues(q, true);
edea55ab
BVA
173 } else if (strcmp(op, "kick") == 0) {
174 blk_mq_kick_requeue_list(q);
91d68905 175 } else {
c7e4145a
OS
176 pr_err("%s: unsupported operation '%s'\n", __func__, op);
177inval:
edea55ab 178 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
91d68905
BVA
179 return -EINVAL;
180 }
c7e4145a 181 return count;
91d68905
BVA
182}
183
1209cb7f
BVA
184static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
185 { "poll_stat", 0400, queue_poll_stat_show },
186 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
cd84a62e 187 { "pm_only", 0600, queue_pm_only_show, NULL },
1209cb7f 188 { "state", 0600, queue_state_show, queue_state_write },
18bc4230 189 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
1209cb7f
BVA
190 { },
191};
34dbad5d 192
1a435111 193#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
f5c0b091 194static const char *const hctx_state_name[] = {
1a435111
OS
195 HCTX_STATE_NAME(STOPPED),
196 HCTX_STATE_NAME(TAG_ACTIVE),
197 HCTX_STATE_NAME(SCHED_RESTART),
bf0beec0 198 HCTX_STATE_NAME(INACTIVE),
f5c0b091 199};
1a435111
OS
200#undef HCTX_STATE_NAME
201
f57de23a 202static int hctx_state_show(void *data, struct seq_file *m)
9abb2ad2 203{
f57de23a 204 struct blk_mq_hw_ctx *hctx = data;
9abb2ad2 205
f5c0b091
BVA
206 blk_flags_show(m, hctx->state, hctx_state_name,
207 ARRAY_SIZE(hctx_state_name));
fd07dc81 208 seq_puts(m, "\n");
9abb2ad2
OS
209 return 0;
210}
211
1a435111 212#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
f5c0b091 213static const char *const alloc_policy_name[] = {
1a435111
OS
214 BLK_TAG_ALLOC_NAME(FIFO),
215 BLK_TAG_ALLOC_NAME(RR),
f5c0b091 216};
1a435111 217#undef BLK_TAG_ALLOC_NAME
f5c0b091 218
1a435111 219#define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
f5c0b091 220static const char *const hctx_flag_name[] = {
1a435111 221 HCTX_FLAG_NAME(SHOULD_MERGE),
51db1c37 222 HCTX_FLAG_NAME(TAG_QUEUE_SHARED),
1a435111
OS
223 HCTX_FLAG_NAME(BLOCKING),
224 HCTX_FLAG_NAME(NO_SCHED),
bf0beec0 225 HCTX_FLAG_NAME(STACKING),
02f938e9 226 HCTX_FLAG_NAME(TAG_HCTX_SHARED),
f5c0b091 227};
1a435111 228#undef HCTX_FLAG_NAME
f5c0b091 229
f57de23a 230static int hctx_flags_show(void *data, struct seq_file *m)
9abb2ad2 231{
f57de23a 232 struct blk_mq_hw_ctx *hctx = data;
f5c0b091 233 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
9abb2ad2 234
f5c0b091
BVA
235 seq_puts(m, "alloc_policy=");
236 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
237 alloc_policy_name[alloc_policy])
238 seq_puts(m, alloc_policy_name[alloc_policy]);
239 else
240 seq_printf(m, "%d", alloc_policy);
241 seq_puts(m, " ");
242 blk_flags_show(m,
243 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
244 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
fd07dc81 245 seq_puts(m, "\n");
9abb2ad2
OS
246 return 0;
247}
248
1a435111 249#define CMD_FLAG_NAME(name) [__REQ_##name] = #name
8658dca8 250static const char *const cmd_flag_name[] = {
1a435111
OS
251 CMD_FLAG_NAME(FAILFAST_DEV),
252 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
253 CMD_FLAG_NAME(FAILFAST_DRIVER),
254 CMD_FLAG_NAME(SYNC),
255 CMD_FLAG_NAME(META),
256 CMD_FLAG_NAME(PRIO),
257 CMD_FLAG_NAME(NOMERGE),
258 CMD_FLAG_NAME(IDLE),
259 CMD_FLAG_NAME(INTEGRITY),
260 CMD_FLAG_NAME(FUA),
261 CMD_FLAG_NAME(PREFLUSH),
262 CMD_FLAG_NAME(RAHEAD),
263 CMD_FLAG_NAME(BACKGROUND),
22d53821 264 CMD_FLAG_NAME(NOWAIT),
1c26010c 265 CMD_FLAG_NAME(NOUNMAP),
6ce913fe 266 CMD_FLAG_NAME(POLLED),
8658dca8 267};
1a435111 268#undef CMD_FLAG_NAME
8658dca8 269
1a435111 270#define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
8658dca8 271static const char *const rqf_name[] = {
85ba3eff 272 RQF_NAME(STARTED),
1a435111
OS
273 RQF_NAME(SOFTBARRIER),
274 RQF_NAME(FLUSH_SEQ),
275 RQF_NAME(MIXED_MERGE),
276 RQF_NAME(MQ_INFLIGHT),
277 RQF_NAME(DONTPREP),
1a435111
OS
278 RQF_NAME(FAILED),
279 RQF_NAME(QUIET),
280 RQF_NAME(ELVPRIV),
281 RQF_NAME(IO_STAT),
1a435111
OS
282 RQF_NAME(PM),
283 RQF_NAME(HASHED),
284 RQF_NAME(STATS),
285 RQF_NAME(SPECIAL_PAYLOAD),
5d75d3f2 286 RQF_NAME(ZONE_WRITE_LOCKED),
76a86f9d 287 RQF_NAME(MQ_POLL_SLEPT),
62ba0c00 288 RQF_NAME(ELV),
8658dca8 289};
1a435111 290#undef RQF_NAME
8658dca8 291
ec6dcf63
BVA
292static const char *const blk_mq_rq_state_name_array[] = {
293 [MQ_RQ_IDLE] = "idle",
294 [MQ_RQ_IN_FLIGHT] = "in_flight",
295 [MQ_RQ_COMPLETE] = "complete",
296};
297
298static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
299{
a1e79188 300 if (WARN_ON_ONCE((unsigned int)rq_state >=
ec6dcf63
BVA
301 ARRAY_SIZE(blk_mq_rq_state_name_array)))
302 return "(?)";
303 return blk_mq_rq_state_name_array[rq_state];
304}
305
daaadb3e 306int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
950cd7e9 307{
2836ee4b 308 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
f9bc64a0 309 const unsigned int op = req_op(rq);
874c893b 310 const char *op_str = blk_op_str(op);
950cd7e9 311
8658dca8 312 seq_printf(m, "%p {.op=", rq);
874c893b 313 if (strcmp(op_str, "UNKNOWN") == 0)
3f6d385f 314 seq_printf(m, "%u", op);
8658dca8 315 else
874c893b 316 seq_printf(m, "%s", op_str);
8658dca8
BVA
317 seq_puts(m, ", .cmd_flags=");
318 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
319 ARRAY_SIZE(cmd_flag_name));
320 seq_puts(m, ", .rq_flags=");
321 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
322 ARRAY_SIZE(rqf_name));
ec6dcf63 323 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
2836ee4b 324 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
8658dca8 325 rq->internal_tag);
2836ee4b
BVA
326 if (mq_ops->show_rq)
327 mq_ops->show_rq(m, rq);
328 seq_puts(m, "}\n");
950cd7e9
OS
329 return 0;
330}
daaadb3e
OS
331EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
332
333int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
334{
335 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
336}
16b738f6 337EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
950cd7e9
OS
338
339static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
f3bcb0e6 340 __acquires(&hctx->lock)
950cd7e9
OS
341{
342 struct blk_mq_hw_ctx *hctx = m->private;
343
344 spin_lock(&hctx->lock);
345 return seq_list_start(&hctx->dispatch, *pos);
346}
347
348static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
349{
350 struct blk_mq_hw_ctx *hctx = m->private;
351
352 return seq_list_next(v, &hctx->dispatch, pos);
353}
354
355static void hctx_dispatch_stop(struct seq_file *m, void *v)
f3bcb0e6 356 __releases(&hctx->lock)
950cd7e9
OS
357{
358 struct blk_mq_hw_ctx *hctx = m->private;
359
360 spin_unlock(&hctx->lock);
361}
362
363static const struct seq_operations hctx_dispatch_seq_ops = {
364 .start = hctx_dispatch_start,
365 .next = hctx_dispatch_next,
366 .stop = hctx_dispatch_stop,
367 .show = blk_mq_debugfs_rq_show,
368};
369
2720bab5
BVA
370struct show_busy_params {
371 struct seq_file *m;
372 struct blk_mq_hw_ctx *hctx;
373};
374
375/*
376 * Note: the state of a request may change while this function is in progress,
7baa8572
JA
377 * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
378 * keep iterating requests.
2720bab5 379 */
7baa8572 380static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
2720bab5
BVA
381{
382 const struct show_busy_params *params = data;
383
ea4f995e 384 if (rq->mq_hctx == params->hctx)
b5fc1e8b 385 __blk_mq_debugfs_rq_show(params->m, rq);
7baa8572
JA
386
387 return true;
2720bab5
BVA
388}
389
390static int hctx_busy_show(void *data, struct seq_file *m)
391{
392 struct blk_mq_hw_ctx *hctx = data;
393 struct show_busy_params params = { .m = m, .hctx = hctx };
394
395 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
396 &params);
397
398 return 0;
399}
400
346fc108
ML
401static const char *const hctx_types[] = {
402 [HCTX_TYPE_DEFAULT] = "default",
403 [HCTX_TYPE_READ] = "read",
404 [HCTX_TYPE_POLL] = "poll",
405};
406
407static int hctx_type_show(void *data, struct seq_file *m)
408{
409 struct blk_mq_hw_ctx *hctx = data;
410
411 BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
412 seq_printf(m, "%s\n", hctx_types[hctx->type]);
413 return 0;
414}
415
f57de23a 416static int hctx_ctx_map_show(void *data, struct seq_file *m)
0bfa5288 417{
f57de23a 418 struct blk_mq_hw_ctx *hctx = data;
0bfa5288
OS
419
420 sbitmap_bitmap_show(&hctx->ctx_map, m);
421 return 0;
422}
423
d96b37c0
OS
424static void blk_mq_debugfs_tags_show(struct seq_file *m,
425 struct blk_mq_tags *tags)
426{
427 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
428 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
429 seq_printf(m, "active_queues=%d\n",
430 atomic_read(&tags->active_queues));
431
432 seq_puts(m, "\nbitmap_tags:\n");
ae0f1a73 433 sbitmap_queue_show(&tags->bitmap_tags, m);
d96b37c0
OS
434
435 if (tags->nr_reserved_tags) {
436 seq_puts(m, "\nbreserved_tags:\n");
ae0f1a73 437 sbitmap_queue_show(&tags->breserved_tags, m);
d96b37c0
OS
438 }
439}
440
f57de23a 441static int hctx_tags_show(void *data, struct seq_file *m)
d96b37c0 442{
f57de23a 443 struct blk_mq_hw_ctx *hctx = data;
d96b37c0 444 struct request_queue *q = hctx->queue;
8c0f14ea 445 int res;
d96b37c0 446
8c0f14ea
BVA
447 res = mutex_lock_interruptible(&q->sysfs_lock);
448 if (res)
449 goto out;
d96b37c0
OS
450 if (hctx->tags)
451 blk_mq_debugfs_tags_show(m, hctx->tags);
452 mutex_unlock(&q->sysfs_lock);
453
8c0f14ea
BVA
454out:
455 return res;
d96b37c0
OS
456}
457
f57de23a 458static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
d7e3621a 459{
f57de23a 460 struct blk_mq_hw_ctx *hctx = data;
d7e3621a 461 struct request_queue *q = hctx->queue;
8c0f14ea 462 int res;
d7e3621a 463
8c0f14ea
BVA
464 res = mutex_lock_interruptible(&q->sysfs_lock);
465 if (res)
466 goto out;
d7e3621a 467 if (hctx->tags)
ae0f1a73 468 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
d7e3621a 469 mutex_unlock(&q->sysfs_lock);
8c0f14ea
BVA
470
471out:
472 return res;
d7e3621a
OS
473}
474
f57de23a 475static int hctx_sched_tags_show(void *data, struct seq_file *m)
d96b37c0 476{
f57de23a 477 struct blk_mq_hw_ctx *hctx = data;
d96b37c0 478 struct request_queue *q = hctx->queue;
8c0f14ea 479 int res;
d96b37c0 480
8c0f14ea
BVA
481 res = mutex_lock_interruptible(&q->sysfs_lock);
482 if (res)
483 goto out;
d96b37c0
OS
484 if (hctx->sched_tags)
485 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
486 mutex_unlock(&q->sysfs_lock);
487
8c0f14ea
BVA
488out:
489 return res;
d96b37c0
OS
490}
491
f57de23a 492static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
d7e3621a 493{
f57de23a 494 struct blk_mq_hw_ctx *hctx = data;
d7e3621a 495 struct request_queue *q = hctx->queue;
8c0f14ea 496 int res;
d7e3621a 497
8c0f14ea
BVA
498 res = mutex_lock_interruptible(&q->sysfs_lock);
499 if (res)
500 goto out;
d7e3621a 501 if (hctx->sched_tags)
ae0f1a73 502 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
d7e3621a 503 mutex_unlock(&q->sysfs_lock);
8c0f14ea
BVA
504
505out:
506 return res;
d7e3621a
OS
507}
508
f57de23a 509static int hctx_run_show(void *data, struct seq_file *m)
4a46f05e 510{
f57de23a 511 struct blk_mq_hw_ctx *hctx = data;
4a46f05e
OS
512
513 seq_printf(m, "%lu\n", hctx->run);
514 return 0;
515}
516
f57de23a
OS
517static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
518 loff_t *ppos)
4a46f05e 519{
f57de23a 520 struct blk_mq_hw_ctx *hctx = data;
4a46f05e
OS
521
522 hctx->run = 0;
523 return count;
524}
525
f57de23a 526static int hctx_active_show(void *data, struct seq_file *m)
4a46f05e 527{
f57de23a 528 struct blk_mq_hw_ctx *hctx = data;
4a46f05e 529
9b84c629 530 seq_printf(m, "%d\n", __blk_mq_active_requests(hctx));
4a46f05e
OS
531 return 0;
532}
533
6e768717
ML
534static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
535{
536 struct blk_mq_hw_ctx *hctx = data;
537
538 seq_printf(m, "%u\n", hctx->dispatch_busy);
539 return 0;
540}
541
c16d6b5a
ML
542#define CTX_RQ_SEQ_OPS(name, type) \
543static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
544 __acquires(&ctx->lock) \
545{ \
546 struct blk_mq_ctx *ctx = m->private; \
547 \
548 spin_lock(&ctx->lock); \
549 return seq_list_start(&ctx->rq_lists[type], *pos); \
550} \
551 \
552static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \
553 loff_t *pos) \
554{ \
555 struct blk_mq_ctx *ctx = m->private; \
556 \
557 return seq_list_next(v, &ctx->rq_lists[type], pos); \
558} \
559 \
560static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \
561 __releases(&ctx->lock) \
562{ \
563 struct blk_mq_ctx *ctx = m->private; \
564 \
565 spin_unlock(&ctx->lock); \
566} \
567 \
568static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \
569 .start = ctx_##name##_rq_list_start, \
570 .next = ctx_##name##_rq_list_next, \
571 .stop = ctx_##name##_rq_list_stop, \
572 .show = blk_mq_debugfs_rq_show, \
573}
574
575CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
576CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
577CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
950cd7e9 578
f57de23a
OS
579static int blk_mq_debugfs_show(struct seq_file *m, void *v)
580{
581 const struct blk_mq_debugfs_attr *attr = m->private;
582 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
583
584 return attr->show(data, m);
585}
586
587static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
588 size_t count, loff_t *ppos)
4a46f05e
OS
589{
590 struct seq_file *m = file->private_data;
f57de23a
OS
591 const struct blk_mq_debugfs_attr *attr = m->private;
592 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
4a46f05e 593
6b136a24
EG
594 /*
595 * Attributes that only implement .seq_ops are read-only and 'attr' is
596 * the same with 'data' in this case.
597 */
598 if (attr == data || !attr->write)
f57de23a
OS
599 return -EPERM;
600
601 return attr->write(data, buf, count, ppos);
602}
603
604static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
605{
606 const struct blk_mq_debugfs_attr *attr = inode->i_private;
607 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
608 struct seq_file *m;
609 int ret;
610
611 if (attr->seq_ops) {
612 ret = seq_open(file, attr->seq_ops);
613 if (!ret) {
614 m = file->private_data;
615 m->private = data;
616 }
617 return ret;
618 }
619
620 if (WARN_ON_ONCE(!attr->show))
621 return -EPERM;
622
623 return single_open(file, blk_mq_debugfs_show, inode->i_private);
4a46f05e
OS
624}
625
f57de23a
OS
626static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
627{
628 const struct blk_mq_debugfs_attr *attr = inode->i_private;
629
630 if (attr->show)
631 return single_release(inode, file);
ee1e0359
CK
632
633 return seq_release(inode, file);
f57de23a
OS
634}
635
f8465933 636static const struct file_operations blk_mq_debugfs_fops = {
f57de23a 637 .open = blk_mq_debugfs_open,
4a46f05e 638 .read = seq_read,
f57de23a 639 .write = blk_mq_debugfs_write,
4a46f05e 640 .llseek = seq_lseek,
f57de23a 641 .release = blk_mq_debugfs_release,
4a46f05e
OS
642};
643
07e4fead 644static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
f57de23a
OS
645 {"state", 0400, hctx_state_show},
646 {"flags", 0400, hctx_flags_show},
647 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
2720bab5 648 {"busy", 0400, hctx_busy_show},
f57de23a
OS
649 {"ctx_map", 0400, hctx_ctx_map_show},
650 {"tags", 0400, hctx_tags_show},
651 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
652 {"sched_tags", 0400, hctx_sched_tags_show},
653 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
f57de23a
OS
654 {"run", 0600, hctx_run_show, hctx_run_write},
655 {"active", 0400, hctx_active_show},
6e768717 656 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
346fc108 657 {"type", 0400, hctx_type_show},
72f2f8f6 658 {},
07e4fead
OS
659};
660
661static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
c16d6b5a
ML
662 {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
663 {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
664 {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
72f2f8f6 665 {},
07e4fead
OS
666};
667
6cfc0081 668static void debugfs_create_files(struct dentry *parent, void *data,
9c1051aa
OS
669 const struct blk_mq_debugfs_attr *attr)
670{
36991ca6 671 if (IS_ERR_OR_NULL(parent))
6cfc0081 672 return;
36991ca6 673
9c1051aa
OS
674 d_inode(parent)->i_private = data;
675
6cfc0081
GKH
676 for (; attr->name; attr++)
677 debugfs_create_file(attr->name, attr->mode, parent,
678 (void *)attr, &blk_mq_debugfs_fops);
9c1051aa
OS
679}
680
6cfc0081 681void blk_mq_debugfs_register(struct request_queue *q)
07e4fead 682{
9c1051aa 683 struct blk_mq_hw_ctx *hctx;
4f481208 684 unsigned long i;
9c1051aa 685
6cfc0081 686 debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
07e4fead 687
9c1051aa 688 /*
70e62f4b 689 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
9c1051aa
OS
690 * didn't exist yet (because we don't know what to name the directory
691 * until the queue is registered to a gendisk).
692 */
70e62f4b
OS
693 if (q->elevator && !q->sched_debugfs_dir)
694 blk_mq_debugfs_register_sched(q);
695
696 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
9c1051aa 697 queue_for_each_hw_ctx(q, hctx, i) {
6cfc0081
GKH
698 if (!hctx->debugfs_dir)
699 blk_mq_debugfs_register_hctx(q, hctx);
700 if (q->elevator && !hctx->sched_debugfs_dir)
701 blk_mq_debugfs_register_sched_hctx(q, hctx);
9c1051aa
OS
702 }
703
cc56694f
ML
704 if (q->rq_qos) {
705 struct rq_qos *rqos = q->rq_qos;
706
707 while (rqos) {
708 blk_mq_debugfs_register_rqos(rqos);
709 rqos = rqos->next;
710 }
711 }
07e4fead
OS
712}
713
714void blk_mq_debugfs_unregister(struct request_queue *q)
715{
d332ce09 716 q->sched_debugfs_dir = NULL;
07e4fead
OS
717}
718
6cfc0081
GKH
719static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
720 struct blk_mq_ctx *ctx)
07e4fead
OS
721{
722 struct dentry *ctx_dir;
723 char name[20];
07e4fead
OS
724
725 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
9c1051aa 726 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
07e4fead 727
6cfc0081 728 debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
07e4fead
OS
729}
730
6cfc0081
GKH
731void blk_mq_debugfs_register_hctx(struct request_queue *q,
732 struct blk_mq_hw_ctx *hctx)
07e4fead
OS
733{
734 struct blk_mq_ctx *ctx;
07e4fead
OS
735 char name[20];
736 int i;
737
88aabbd7 738 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
9c1051aa 739 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
07e4fead 740
6cfc0081 741 debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
9c1051aa 742
6cfc0081
GKH
743 hctx_for_each_ctx(hctx, ctx, i)
744 blk_mq_debugfs_register_ctx(hctx, ctx);
9c1051aa
OS
745}
746
747void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
748{
749 debugfs_remove_recursive(hctx->debugfs_dir);
d332ce09 750 hctx->sched_debugfs_dir = NULL;
9c1051aa 751 hctx->debugfs_dir = NULL;
07e4fead
OS
752}
753
6cfc0081 754void blk_mq_debugfs_register_hctxs(struct request_queue *q)
07e4fead
OS
755{
756 struct blk_mq_hw_ctx *hctx;
4f481208 757 unsigned long i;
07e4fead 758
6cfc0081
GKH
759 queue_for_each_hw_ctx(q, hctx, i)
760 blk_mq_debugfs_register_hctx(q, hctx);
07e4fead
OS
761}
762
9c1051aa 763void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
07e4fead 764{
9c1051aa 765 struct blk_mq_hw_ctx *hctx;
4f481208 766 unsigned long i;
9c1051aa
OS
767
768 queue_for_each_hw_ctx(q, hctx, i)
769 blk_mq_debugfs_unregister_hctx(hctx);
07e4fead 770}
d332ce09 771
6cfc0081 772void blk_mq_debugfs_register_sched(struct request_queue *q)
d332ce09
OS
773{
774 struct elevator_type *e = q->elevator->type;
775
7e41c3c9
GKH
776 /*
777 * If the parent directory has not been created yet, return, we will be
778 * called again later on and the directory/files will be created then.
779 */
780 if (!q->debugfs_dir)
781 return;
782
d332ce09 783 if (!e->queue_debugfs_attrs)
6cfc0081 784 return;
d332ce09
OS
785
786 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
d332ce09 787
6cfc0081 788 debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
d332ce09
OS
789}
790
791void blk_mq_debugfs_unregister_sched(struct request_queue *q)
792{
793 debugfs_remove_recursive(q->sched_debugfs_dir);
794 q->sched_debugfs_dir = NULL;
795}
796
fb44023e
BVA
797static const char *rq_qos_id_to_name(enum rq_qos_id id)
798{
799 switch (id) {
800 case RQ_QOS_WBT:
801 return "wbt";
802 case RQ_QOS_LATENCY:
803 return "latency";
804 case RQ_QOS_COST:
805 return "cost";
556910e3
BVA
806 case RQ_QOS_IOPRIO:
807 return "ioprio";
fb44023e
BVA
808 }
809 return "unknown";
810}
811
cc56694f
ML
812void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
813{
814 debugfs_remove_recursive(rqos->debugfs_dir);
815 rqos->debugfs_dir = NULL;
816}
817
6cfc0081 818void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
cc56694f
ML
819{
820 struct request_queue *q = rqos->q;
821 const char *dir_name = rq_qos_id_to_name(rqos->id);
822
cc56694f 823 if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
6cfc0081 824 return;
cc56694f 825
6cfc0081 826 if (!q->rqos_debugfs_dir)
cc56694f
ML
827 q->rqos_debugfs_dir = debugfs_create_dir("rqos",
828 q->debugfs_dir);
cc56694f
ML
829
830 rqos->debugfs_dir = debugfs_create_dir(dir_name,
831 rqos->q->rqos_debugfs_dir);
cc56694f 832
6cfc0081 833 debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
cc56694f
ML
834}
835
836void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
837{
838 debugfs_remove_recursive(q->rqos_debugfs_dir);
839 q->rqos_debugfs_dir = NULL;
840}
841
6cfc0081
GKH
842void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
843 struct blk_mq_hw_ctx *hctx)
d332ce09
OS
844{
845 struct elevator_type *e = q->elevator->type;
846
1e91e28e
S
847 /*
848 * If the parent debugfs directory has not been created yet, return;
849 * We will be called again later on with appropriate parent debugfs
850 * directory from blk_register_queue()
851 */
852 if (!hctx->debugfs_dir)
853 return;
854
d332ce09 855 if (!e->hctx_debugfs_attrs)
6cfc0081 856 return;
d332ce09
OS
857
858 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
859 hctx->debugfs_dir);
6cfc0081
GKH
860 debugfs_create_files(hctx->sched_debugfs_dir, hctx,
861 e->hctx_debugfs_attrs);
d332ce09
OS
862}
863
864void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
865{
866 debugfs_remove_recursive(hctx->sched_debugfs_dir);
867 hctx->sched_debugfs_dir = NULL;
868}