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