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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2017 Facebook
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/blkdev.h>
8 #include <linux/debugfs.h>
9
10 #include <linux/blk-mq.h>
11 #include "blk.h"
12 #include "blk-mq.h"
13 #include "blk-mq-debugfs.h"
14 #include "blk-mq-sched.h"
15 #include "blk-mq-tag.h"
16 #include "blk-rq-qos.h"
17
18 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
19 {
20 if (stat->nr_samples) {
21 seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu",
22 stat->nr_samples, stat->mean, stat->min, stat->max);
23 } else {
24 seq_puts(m, "samples=0");
25 }
26 }
27
28 static int queue_poll_stat_show(void *data, struct seq_file *m)
29 {
30 struct request_queue *q = data;
31 int bucket;
32
33 if (!q->poll_stat)
34 return 0;
35
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]);
39 seq_puts(m, "\n");
40
41 seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket));
42 print_stat(m, &q->poll_stat[2 * bucket + 1]);
43 seq_puts(m, "\n");
44 }
45 return 0;
46 }
47
48 static 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
57 static 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
64 static 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
72 static 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
79 static 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)
89 seq_puts(m, "|");
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 }
96 return 0;
97 }
98
99 static 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
107 #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
108 static const char *const blk_queue_flag_name[] = {
109 QUEUE_FLAG_NAME(STOPPED),
110 QUEUE_FLAG_NAME(DYING),
111 QUEUE_FLAG_NAME(NOMERGES),
112 QUEUE_FLAG_NAME(SAME_COMP),
113 QUEUE_FLAG_NAME(FAIL_IO),
114 QUEUE_FLAG_NAME(NONROT),
115 QUEUE_FLAG_NAME(IO_STAT),
116 QUEUE_FLAG_NAME(NOXMERGES),
117 QUEUE_FLAG_NAME(ADD_RANDOM),
118 QUEUE_FLAG_NAME(SAME_FORCE),
119 QUEUE_FLAG_NAME(INIT_DONE),
120 QUEUE_FLAG_NAME(STABLE_WRITES),
121 QUEUE_FLAG_NAME(POLL),
122 QUEUE_FLAG_NAME(WC),
123 QUEUE_FLAG_NAME(FUA),
124 QUEUE_FLAG_NAME(DAX),
125 QUEUE_FLAG_NAME(STATS),
126 QUEUE_FLAG_NAME(REGISTERED),
127 QUEUE_FLAG_NAME(QUIESCED),
128 QUEUE_FLAG_NAME(PCI_P2PDMA),
129 QUEUE_FLAG_NAME(ZONE_RESETALL),
130 QUEUE_FLAG_NAME(RQ_ALLOC_TIME),
131 QUEUE_FLAG_NAME(HCTX_ACTIVE),
132 QUEUE_FLAG_NAME(NOWAIT),
133 };
134 #undef QUEUE_FLAG_NAME
135
136 static int queue_state_show(void *data, struct seq_file *m)
137 {
138 struct request_queue *q = data;
139
140 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
141 ARRAY_SIZE(blk_queue_flag_name));
142 seq_puts(m, "\n");
143 return 0;
144 }
145
146 static ssize_t queue_state_write(void *data, const char __user *buf,
147 size_t count, loff_t *ppos)
148 {
149 struct request_queue *q = data;
150 char opbuf[16] = { }, *op;
151
152 /*
153 * The "state" attribute is removed when the queue is removed. Don't
154 * allow setting the state on a dying queue to avoid a use-after-free.
155 */
156 if (blk_queue_dying(q))
157 return -ENOENT;
158
159 if (count >= sizeof(opbuf)) {
160 pr_err("%s: operation too long\n", __func__);
161 goto inval;
162 }
163
164 if (copy_from_user(opbuf, buf, count))
165 return -EFAULT;
166 op = strstrip(opbuf);
167 if (strcmp(op, "run") == 0) {
168 blk_mq_run_hw_queues(q, true);
169 } else if (strcmp(op, "start") == 0) {
170 blk_mq_start_stopped_hw_queues(q, true);
171 } else if (strcmp(op, "kick") == 0) {
172 blk_mq_kick_requeue_list(q);
173 } else {
174 pr_err("%s: unsupported operation '%s'\n", __func__, op);
175 inval:
176 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
177 return -EINVAL;
178 }
179 return count;
180 }
181
182 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
183 { "poll_stat", 0400, queue_poll_stat_show },
184 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
185 { "pm_only", 0600, queue_pm_only_show, NULL },
186 { "state", 0600, queue_state_show, queue_state_write },
187 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
188 { },
189 };
190
191 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
192 static const char *const hctx_state_name[] = {
193 HCTX_STATE_NAME(STOPPED),
194 HCTX_STATE_NAME(TAG_ACTIVE),
195 HCTX_STATE_NAME(SCHED_RESTART),
196 HCTX_STATE_NAME(INACTIVE),
197 };
198 #undef HCTX_STATE_NAME
199
200 static int hctx_state_show(void *data, struct seq_file *m)
201 {
202 struct blk_mq_hw_ctx *hctx = data;
203
204 blk_flags_show(m, hctx->state, hctx_state_name,
205 ARRAY_SIZE(hctx_state_name));
206 seq_puts(m, "\n");
207 return 0;
208 }
209
210 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
211 static const char *const alloc_policy_name[] = {
212 BLK_TAG_ALLOC_NAME(FIFO),
213 BLK_TAG_ALLOC_NAME(RR),
214 };
215 #undef BLK_TAG_ALLOC_NAME
216
217 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
218 static const char *const hctx_flag_name[] = {
219 HCTX_FLAG_NAME(SHOULD_MERGE),
220 HCTX_FLAG_NAME(TAG_QUEUE_SHARED),
221 HCTX_FLAG_NAME(BLOCKING),
222 HCTX_FLAG_NAME(NO_SCHED),
223 HCTX_FLAG_NAME(STACKING),
224 HCTX_FLAG_NAME(TAG_HCTX_SHARED),
225 };
226 #undef HCTX_FLAG_NAME
227
228 static int hctx_flags_show(void *data, struct seq_file *m)
229 {
230 struct blk_mq_hw_ctx *hctx = data;
231 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
232
233 seq_puts(m, "alloc_policy=");
234 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
235 alloc_policy_name[alloc_policy])
236 seq_puts(m, alloc_policy_name[alloc_policy]);
237 else
238 seq_printf(m, "%d", alloc_policy);
239 seq_puts(m, " ");
240 blk_flags_show(m,
241 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
242 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
243 seq_puts(m, "\n");
244 return 0;
245 }
246
247 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
248 static const char *const cmd_flag_name[] = {
249 CMD_FLAG_NAME(FAILFAST_DEV),
250 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
251 CMD_FLAG_NAME(FAILFAST_DRIVER),
252 CMD_FLAG_NAME(SYNC),
253 CMD_FLAG_NAME(META),
254 CMD_FLAG_NAME(PRIO),
255 CMD_FLAG_NAME(NOMERGE),
256 CMD_FLAG_NAME(IDLE),
257 CMD_FLAG_NAME(INTEGRITY),
258 CMD_FLAG_NAME(FUA),
259 CMD_FLAG_NAME(PREFLUSH),
260 CMD_FLAG_NAME(RAHEAD),
261 CMD_FLAG_NAME(BACKGROUND),
262 CMD_FLAG_NAME(NOWAIT),
263 CMD_FLAG_NAME(NOUNMAP),
264 CMD_FLAG_NAME(POLLED),
265 };
266 #undef CMD_FLAG_NAME
267
268 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
269 static const char *const rqf_name[] = {
270 RQF_NAME(STARTED),
271 RQF_NAME(SOFTBARRIER),
272 RQF_NAME(FLUSH_SEQ),
273 RQF_NAME(MIXED_MERGE),
274 RQF_NAME(MQ_INFLIGHT),
275 RQF_NAME(DONTPREP),
276 RQF_NAME(FAILED),
277 RQF_NAME(QUIET),
278 RQF_NAME(ELVPRIV),
279 RQF_NAME(IO_STAT),
280 RQF_NAME(PM),
281 RQF_NAME(HASHED),
282 RQF_NAME(STATS),
283 RQF_NAME(SPECIAL_PAYLOAD),
284 RQF_NAME(ZONE_WRITE_LOCKED),
285 RQF_NAME(MQ_POLL_SLEPT),
286 RQF_NAME(TIMED_OUT),
287 RQF_NAME(ELV),
288 RQF_NAME(RESV),
289 };
290 #undef RQF_NAME
291
292 static 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
298 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
299 {
300 if (WARN_ON_ONCE((unsigned int)rq_state >=
301 ARRAY_SIZE(blk_mq_rq_state_name_array)))
302 return "(?)";
303 return blk_mq_rq_state_name_array[rq_state];
304 }
305
306 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
307 {
308 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
309 const enum req_op op = req_op(rq);
310 const char *op_str = blk_op_str(op);
311
312 seq_printf(m, "%p {.op=", rq);
313 if (strcmp(op_str, "UNKNOWN") == 0)
314 seq_printf(m, "%u", op);
315 else
316 seq_printf(m, "%s", op_str);
317 seq_puts(m, ", .cmd_flags=");
318 blk_flags_show(m, (__force unsigned int)(rq->cmd_flags & ~REQ_OP_MASK),
319 cmd_flag_name, 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));
323 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
324 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
325 rq->internal_tag);
326 if (mq_ops->show_rq)
327 mq_ops->show_rq(m, rq);
328 seq_puts(m, "}\n");
329 return 0;
330 }
331 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
332
333 int 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 }
337 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
338
339 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
340 __acquires(&hctx->lock)
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
348 static 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
355 static void hctx_dispatch_stop(struct seq_file *m, void *v)
356 __releases(&hctx->lock)
357 {
358 struct blk_mq_hw_ctx *hctx = m->private;
359
360 spin_unlock(&hctx->lock);
361 }
362
363 static 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
370 struct 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,
377 * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
378 * keep iterating requests.
379 */
380 static bool hctx_show_busy_rq(struct request *rq, void *data)
381 {
382 const struct show_busy_params *params = data;
383
384 if (rq->mq_hctx == params->hctx)
385 __blk_mq_debugfs_rq_show(params->m, rq);
386
387 return true;
388 }
389
390 static 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
401 static const char *const hctx_types[] = {
402 [HCTX_TYPE_DEFAULT] = "default",
403 [HCTX_TYPE_READ] = "read",
404 [HCTX_TYPE_POLL] = "poll",
405 };
406
407 static 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
416 static int hctx_ctx_map_show(void *data, struct seq_file *m)
417 {
418 struct blk_mq_hw_ctx *hctx = data;
419
420 sbitmap_bitmap_show(&hctx->ctx_map, m);
421 return 0;
422 }
423
424 static 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");
433 sbitmap_queue_show(&tags->bitmap_tags, m);
434
435 if (tags->nr_reserved_tags) {
436 seq_puts(m, "\nbreserved_tags:\n");
437 sbitmap_queue_show(&tags->breserved_tags, m);
438 }
439 }
440
441 static int hctx_tags_show(void *data, struct seq_file *m)
442 {
443 struct blk_mq_hw_ctx *hctx = data;
444 struct request_queue *q = hctx->queue;
445 int res;
446
447 res = mutex_lock_interruptible(&q->sysfs_lock);
448 if (res)
449 goto out;
450 if (hctx->tags)
451 blk_mq_debugfs_tags_show(m, hctx->tags);
452 mutex_unlock(&q->sysfs_lock);
453
454 out:
455 return res;
456 }
457
458 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
459 {
460 struct blk_mq_hw_ctx *hctx = data;
461 struct request_queue *q = hctx->queue;
462 int res;
463
464 res = mutex_lock_interruptible(&q->sysfs_lock);
465 if (res)
466 goto out;
467 if (hctx->tags)
468 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
469 mutex_unlock(&q->sysfs_lock);
470
471 out:
472 return res;
473 }
474
475 static int hctx_sched_tags_show(void *data, struct seq_file *m)
476 {
477 struct blk_mq_hw_ctx *hctx = data;
478 struct request_queue *q = hctx->queue;
479 int res;
480
481 res = mutex_lock_interruptible(&q->sysfs_lock);
482 if (res)
483 goto out;
484 if (hctx->sched_tags)
485 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
486 mutex_unlock(&q->sysfs_lock);
487
488 out:
489 return res;
490 }
491
492 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
493 {
494 struct blk_mq_hw_ctx *hctx = data;
495 struct request_queue *q = hctx->queue;
496 int res;
497
498 res = mutex_lock_interruptible(&q->sysfs_lock);
499 if (res)
500 goto out;
501 if (hctx->sched_tags)
502 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
503 mutex_unlock(&q->sysfs_lock);
504
505 out:
506 return res;
507 }
508
509 static int hctx_run_show(void *data, struct seq_file *m)
510 {
511 struct blk_mq_hw_ctx *hctx = data;
512
513 seq_printf(m, "%lu\n", hctx->run);
514 return 0;
515 }
516
517 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
518 loff_t *ppos)
519 {
520 struct blk_mq_hw_ctx *hctx = data;
521
522 hctx->run = 0;
523 return count;
524 }
525
526 static int hctx_active_show(void *data, struct seq_file *m)
527 {
528 struct blk_mq_hw_ctx *hctx = data;
529
530 seq_printf(m, "%d\n", __blk_mq_active_requests(hctx));
531 return 0;
532 }
533
534 static 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
542 #define CTX_RQ_SEQ_OPS(name, type) \
543 static 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 \
552 static 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 \
560 static 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 \
568 static 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
575 CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
576 CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
577 CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
578
579 static 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
587 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
588 size_t count, loff_t *ppos)
589 {
590 struct seq_file *m = file->private_data;
591 const struct blk_mq_debugfs_attr *attr = m->private;
592 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
593
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)
599 return -EPERM;
600
601 return attr->write(data, buf, count, ppos);
602 }
603
604 static 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);
624 }
625
626 static 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);
632
633 return seq_release(inode, file);
634 }
635
636 static const struct file_operations blk_mq_debugfs_fops = {
637 .open = blk_mq_debugfs_open,
638 .read = seq_read,
639 .write = blk_mq_debugfs_write,
640 .llseek = seq_lseek,
641 .release = blk_mq_debugfs_release,
642 };
643
644 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
645 {"state", 0400, hctx_state_show},
646 {"flags", 0400, hctx_flags_show},
647 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
648 {"busy", 0400, hctx_busy_show},
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},
654 {"run", 0600, hctx_run_show, hctx_run_write},
655 {"active", 0400, hctx_active_show},
656 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
657 {"type", 0400, hctx_type_show},
658 {},
659 };
660
661 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
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},
665 {},
666 };
667
668 static void debugfs_create_files(struct dentry *parent, void *data,
669 const struct blk_mq_debugfs_attr *attr)
670 {
671 if (IS_ERR_OR_NULL(parent))
672 return;
673
674 d_inode(parent)->i_private = data;
675
676 for (; attr->name; attr++)
677 debugfs_create_file(attr->name, attr->mode, parent,
678 (void *)attr, &blk_mq_debugfs_fops);
679 }
680
681 void blk_mq_debugfs_register(struct request_queue *q)
682 {
683 struct blk_mq_hw_ctx *hctx;
684 unsigned long i;
685
686 debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
687
688 /*
689 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
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 */
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. */
697 queue_for_each_hw_ctx(q, hctx, i) {
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);
702 }
703
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 }
712 }
713
714 static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
715 struct blk_mq_ctx *ctx)
716 {
717 struct dentry *ctx_dir;
718 char name[20];
719
720 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
721 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
722
723 debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
724 }
725
726 void blk_mq_debugfs_register_hctx(struct request_queue *q,
727 struct blk_mq_hw_ctx *hctx)
728 {
729 struct blk_mq_ctx *ctx;
730 char name[20];
731 int i;
732
733 if (!q->debugfs_dir)
734 return;
735
736 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
737 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
738
739 debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
740
741 hctx_for_each_ctx(hctx, ctx, i)
742 blk_mq_debugfs_register_ctx(hctx, ctx);
743 }
744
745 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
746 {
747 if (!hctx->queue->debugfs_dir)
748 return;
749 debugfs_remove_recursive(hctx->debugfs_dir);
750 hctx->sched_debugfs_dir = NULL;
751 hctx->debugfs_dir = NULL;
752 }
753
754 void blk_mq_debugfs_register_hctxs(struct request_queue *q)
755 {
756 struct blk_mq_hw_ctx *hctx;
757 unsigned long i;
758
759 queue_for_each_hw_ctx(q, hctx, i)
760 blk_mq_debugfs_register_hctx(q, hctx);
761 }
762
763 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
764 {
765 struct blk_mq_hw_ctx *hctx;
766 unsigned long i;
767
768 queue_for_each_hw_ctx(q, hctx, i)
769 blk_mq_debugfs_unregister_hctx(hctx);
770 }
771
772 void blk_mq_debugfs_register_sched(struct request_queue *q)
773 {
774 struct elevator_type *e = q->elevator->type;
775
776 lockdep_assert_held(&q->debugfs_mutex);
777
778 /*
779 * If the parent directory has not been created yet, return, we will be
780 * called again later on and the directory/files will be created then.
781 */
782 if (!q->debugfs_dir)
783 return;
784
785 if (!e->queue_debugfs_attrs)
786 return;
787
788 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
789
790 debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
791 }
792
793 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
794 {
795 lockdep_assert_held(&q->debugfs_mutex);
796
797 debugfs_remove_recursive(q->sched_debugfs_dir);
798 q->sched_debugfs_dir = NULL;
799 }
800
801 static const char *rq_qos_id_to_name(enum rq_qos_id id)
802 {
803 switch (id) {
804 case RQ_QOS_WBT:
805 return "wbt";
806 case RQ_QOS_LATENCY:
807 return "latency";
808 case RQ_QOS_COST:
809 return "cost";
810 }
811 return "unknown";
812 }
813
814 void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
815 {
816 lockdep_assert_held(&rqos->q->debugfs_mutex);
817
818 if (!rqos->q->debugfs_dir)
819 return;
820 debugfs_remove_recursive(rqos->debugfs_dir);
821 rqos->debugfs_dir = NULL;
822 }
823
824 void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
825 {
826 struct request_queue *q = rqos->q;
827 const char *dir_name = rq_qos_id_to_name(rqos->id);
828
829 lockdep_assert_held(&q->debugfs_mutex);
830
831 if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
832 return;
833
834 if (!q->rqos_debugfs_dir)
835 q->rqos_debugfs_dir = debugfs_create_dir("rqos",
836 q->debugfs_dir);
837
838 rqos->debugfs_dir = debugfs_create_dir(dir_name,
839 rqos->q->rqos_debugfs_dir);
840
841 debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
842 }
843
844 void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
845 struct blk_mq_hw_ctx *hctx)
846 {
847 struct elevator_type *e = q->elevator->type;
848
849 lockdep_assert_held(&q->debugfs_mutex);
850
851 /*
852 * If the parent debugfs directory has not been created yet, return;
853 * We will be called again later on with appropriate parent debugfs
854 * directory from blk_register_queue()
855 */
856 if (!hctx->debugfs_dir)
857 return;
858
859 if (!e->hctx_debugfs_attrs)
860 return;
861
862 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
863 hctx->debugfs_dir);
864 debugfs_create_files(hctx->sched_debugfs_dir, hctx,
865 e->hctx_debugfs_attrs);
866 }
867
868 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
869 {
870 lockdep_assert_held(&hctx->queue->debugfs_mutex);
871
872 if (!hctx->queue->debugfs_dir)
873 return;
874 debugfs_remove_recursive(hctx->sched_debugfs_dir);
875 hctx->sched_debugfs_dir = NULL;
876 }
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