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07e4fead OS |
1 | /* |
2 | * Copyright (C) 2017 Facebook | |
3 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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/>. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/debugfs.h> | |
20 | ||
21 | #include <linux/blk-mq.h> | |
18fbda91 | 22 | #include "blk.h" |
07e4fead | 23 | #include "blk-mq.h" |
d173a251 | 24 | #include "blk-mq-debugfs.h" |
d96b37c0 | 25 | #include "blk-mq-tag.h" |
07e4fead | 26 | |
1209cb7f BVA |
27 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
28 | { | |
29 | if (stat->nr_samples) { | |
30 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
31 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
32 | } else { | |
33 | seq_puts(m, "samples=0"); | |
34 | } | |
35 | } | |
36 | ||
37 | static int queue_poll_stat_show(void *data, struct seq_file *m) | |
38 | { | |
39 | struct request_queue *q = data; | |
40 | int bucket; | |
41 | ||
42 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { | |
43 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
44 | print_stat(m, &q->poll_stat[2*bucket]); | |
45 | seq_puts(m, "\n"); | |
46 | ||
47 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); | |
48 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
49 | seq_puts(m, "\n"); | |
50 | } | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) | |
55 | __acquires(&q->requeue_lock) | |
56 | { | |
57 | struct request_queue *q = m->private; | |
58 | ||
59 | spin_lock_irq(&q->requeue_lock); | |
60 | return seq_list_start(&q->requeue_list, *pos); | |
61 | } | |
62 | ||
63 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
64 | { | |
65 | struct request_queue *q = m->private; | |
66 | ||
67 | return seq_list_next(v, &q->requeue_list, pos); | |
68 | } | |
69 | ||
70 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
71 | __releases(&q->requeue_lock) | |
72 | { | |
73 | struct request_queue *q = m->private; | |
74 | ||
75 | spin_unlock_irq(&q->requeue_lock); | |
76 | } | |
77 | ||
78 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
79 | .start = queue_requeue_list_start, | |
80 | .next = queue_requeue_list_next, | |
81 | .stop = queue_requeue_list_stop, | |
82 | .show = blk_mq_debugfs_rq_show, | |
83 | }; | |
84 | ||
91d68905 BVA |
85 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
86 | const char *const *flag_name, int flag_name_count) | |
87 | { | |
88 | bool sep = false; | |
89 | int i; | |
90 | ||
91 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
92 | if (!(flags & BIT(i))) | |
93 | continue; | |
94 | if (sep) | |
bec03d6b | 95 | seq_puts(m, "|"); |
91d68905 BVA |
96 | sep = true; |
97 | if (i < flag_name_count && flag_name[i]) | |
98 | seq_puts(m, flag_name[i]); | |
99 | else | |
100 | seq_printf(m, "%d", i); | |
101 | } | |
91d68905 BVA |
102 | return 0; |
103 | } | |
104 | ||
1a435111 | 105 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 106 | static const char *const blk_queue_flag_name[] = { |
1a435111 OS |
107 | QUEUE_FLAG_NAME(QUEUED), |
108 | QUEUE_FLAG_NAME(STOPPED), | |
1a435111 OS |
109 | QUEUE_FLAG_NAME(DYING), |
110 | QUEUE_FLAG_NAME(BYPASS), | |
111 | QUEUE_FLAG_NAME(BIDI), | |
112 | QUEUE_FLAG_NAME(NOMERGES), | |
113 | QUEUE_FLAG_NAME(SAME_COMP), | |
114 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
115 | QUEUE_FLAG_NAME(NONROT), |
116 | QUEUE_FLAG_NAME(IO_STAT), | |
117 | QUEUE_FLAG_NAME(DISCARD), | |
118 | QUEUE_FLAG_NAME(NOXMERGES), | |
119 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
120 | QUEUE_FLAG_NAME(SECERASE), | |
121 | QUEUE_FLAG_NAME(SAME_FORCE), | |
122 | QUEUE_FLAG_NAME(DEAD), | |
123 | QUEUE_FLAG_NAME(INIT_DONE), | |
124 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
125 | QUEUE_FLAG_NAME(POLL), | |
126 | QUEUE_FLAG_NAME(WC), | |
127 | QUEUE_FLAG_NAME(FUA), | |
128 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
129 | QUEUE_FLAG_NAME(DAX), | |
130 | QUEUE_FLAG_NAME(STATS), | |
131 | QUEUE_FLAG_NAME(POLL_STATS), | |
132 | QUEUE_FLAG_NAME(REGISTERED), | |
22d53821 BVA |
133 | QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), |
134 | QUEUE_FLAG_NAME(QUIESCED), | |
c9254f2d | 135 | QUEUE_FLAG_NAME(PREEMPT_ONLY), |
91d68905 | 136 | }; |
1a435111 | 137 | #undef QUEUE_FLAG_NAME |
91d68905 | 138 | |
f57de23a | 139 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 140 | { |
f57de23a | 141 | struct request_queue *q = data; |
91d68905 BVA |
142 | |
143 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
144 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 145 | seq_puts(m, "\n"); |
91d68905 BVA |
146 | return 0; |
147 | } | |
148 | ||
f57de23a OS |
149 | static ssize_t queue_state_write(void *data, const char __user *buf, |
150 | size_t count, loff_t *ppos) | |
91d68905 | 151 | { |
f57de23a | 152 | struct request_queue *q = data; |
71b90511 | 153 | char opbuf[16] = { }, *op; |
91d68905 | 154 | |
18d4d7d0 BVA |
155 | /* |
156 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
157 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
158 | * triggering a use-after-free. | |
159 | */ | |
160 | if (blk_queue_dead(q)) | |
161 | return -ENOENT; | |
162 | ||
71b90511 | 163 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
164 | pr_err("%s: operation too long\n", __func__); |
165 | goto inval; | |
166 | } | |
167 | ||
71b90511 | 168 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 169 | return -EFAULT; |
71b90511 | 170 | op = strstrip(opbuf); |
91d68905 BVA |
171 | if (strcmp(op, "run") == 0) { |
172 | blk_mq_run_hw_queues(q, true); | |
173 | } else if (strcmp(op, "start") == 0) { | |
174 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
175 | } else if (strcmp(op, "kick") == 0) { |
176 | blk_mq_kick_requeue_list(q); | |
91d68905 | 177 | } else { |
c7e4145a OS |
178 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
179 | inval: | |
edea55ab | 180 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
181 | return -EINVAL; |
182 | } | |
c7e4145a | 183 | return count; |
91d68905 BVA |
184 | } |
185 | ||
f793dfd3 JA |
186 | static int queue_write_hint_show(void *data, struct seq_file *m) |
187 | { | |
188 | struct request_queue *q = data; | |
189 | int i; | |
190 | ||
191 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
192 | seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static ssize_t queue_write_hint_store(void *data, const char __user *buf, | |
198 | size_t count, loff_t *ppos) | |
199 | { | |
200 | struct request_queue *q = data; | |
201 | int i; | |
202 | ||
203 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
204 | q->write_hints[i] = 0; | |
205 | ||
206 | return count; | |
207 | } | |
208 | ||
1209cb7f BVA |
209 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
210 | { "poll_stat", 0400, queue_poll_stat_show }, | |
211 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
212 | { "state", 0600, queue_state_show, queue_state_write }, | |
213 | { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store }, | |
214 | { }, | |
215 | }; | |
34dbad5d | 216 | |
1a435111 | 217 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 218 | static const char *const hctx_state_name[] = { |
1a435111 OS |
219 | HCTX_STATE_NAME(STOPPED), |
220 | HCTX_STATE_NAME(TAG_ACTIVE), | |
221 | HCTX_STATE_NAME(SCHED_RESTART), | |
1a435111 | 222 | HCTX_STATE_NAME(START_ON_RUN), |
f5c0b091 | 223 | }; |
1a435111 OS |
224 | #undef HCTX_STATE_NAME |
225 | ||
f57de23a | 226 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 227 | { |
f57de23a | 228 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 229 | |
f5c0b091 BVA |
230 | blk_flags_show(m, hctx->state, hctx_state_name, |
231 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 232 | seq_puts(m, "\n"); |
9abb2ad2 OS |
233 | return 0; |
234 | } | |
235 | ||
1a435111 | 236 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 237 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
238 | BLK_TAG_ALLOC_NAME(FIFO), |
239 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 240 | }; |
1a435111 | 241 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 242 | |
1a435111 | 243 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 244 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
245 | HCTX_FLAG_NAME(SHOULD_MERGE), |
246 | HCTX_FLAG_NAME(TAG_SHARED), | |
247 | HCTX_FLAG_NAME(SG_MERGE), | |
248 | HCTX_FLAG_NAME(BLOCKING), | |
249 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 250 | }; |
1a435111 | 251 | #undef HCTX_FLAG_NAME |
f5c0b091 | 252 | |
f57de23a | 253 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 254 | { |
f57de23a | 255 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 256 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 257 | |
f5c0b091 BVA |
258 | seq_puts(m, "alloc_policy="); |
259 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
260 | alloc_policy_name[alloc_policy]) | |
261 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
262 | else | |
263 | seq_printf(m, "%d", alloc_policy); | |
264 | seq_puts(m, " "); | |
265 | blk_flags_show(m, | |
266 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
267 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 268 | seq_puts(m, "\n"); |
9abb2ad2 OS |
269 | return 0; |
270 | } | |
271 | ||
1a435111 | 272 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 273 | static const char *const op_name[] = { |
1a435111 OS |
274 | REQ_OP_NAME(READ), |
275 | REQ_OP_NAME(WRITE), | |
276 | REQ_OP_NAME(FLUSH), | |
277 | REQ_OP_NAME(DISCARD), | |
278 | REQ_OP_NAME(ZONE_REPORT), | |
279 | REQ_OP_NAME(SECURE_ERASE), | |
280 | REQ_OP_NAME(ZONE_RESET), | |
281 | REQ_OP_NAME(WRITE_SAME), | |
282 | REQ_OP_NAME(WRITE_ZEROES), | |
283 | REQ_OP_NAME(SCSI_IN), | |
284 | REQ_OP_NAME(SCSI_OUT), | |
285 | REQ_OP_NAME(DRV_IN), | |
286 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 287 | }; |
1a435111 | 288 | #undef REQ_OP_NAME |
8658dca8 | 289 | |
1a435111 | 290 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 291 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
292 | CMD_FLAG_NAME(FAILFAST_DEV), |
293 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
294 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
295 | CMD_FLAG_NAME(SYNC), | |
296 | CMD_FLAG_NAME(META), | |
297 | CMD_FLAG_NAME(PRIO), | |
298 | CMD_FLAG_NAME(NOMERGE), | |
299 | CMD_FLAG_NAME(IDLE), | |
300 | CMD_FLAG_NAME(INTEGRITY), | |
301 | CMD_FLAG_NAME(FUA), | |
302 | CMD_FLAG_NAME(PREFLUSH), | |
303 | CMD_FLAG_NAME(RAHEAD), | |
304 | CMD_FLAG_NAME(BACKGROUND), | |
305 | CMD_FLAG_NAME(NOUNMAP), | |
22d53821 | 306 | CMD_FLAG_NAME(NOWAIT), |
8658dca8 | 307 | }; |
1a435111 | 308 | #undef CMD_FLAG_NAME |
8658dca8 | 309 | |
1a435111 | 310 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 311 | static const char *const rqf_name[] = { |
1a435111 | 312 | RQF_NAME(SORTED), |
85ba3eff | 313 | RQF_NAME(STARTED), |
1a435111 OS |
314 | RQF_NAME(QUEUED), |
315 | RQF_NAME(SOFTBARRIER), | |
316 | RQF_NAME(FLUSH_SEQ), | |
317 | RQF_NAME(MIXED_MERGE), | |
318 | RQF_NAME(MQ_INFLIGHT), | |
319 | RQF_NAME(DONTPREP), | |
320 | RQF_NAME(PREEMPT), | |
321 | RQF_NAME(COPY_USER), | |
322 | RQF_NAME(FAILED), | |
323 | RQF_NAME(QUIET), | |
324 | RQF_NAME(ELVPRIV), | |
325 | RQF_NAME(IO_STAT), | |
326 | RQF_NAME(ALLOCED), | |
327 | RQF_NAME(PM), | |
328 | RQF_NAME(HASHED), | |
329 | RQF_NAME(STATS), | |
330 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 JA |
331 | RQF_NAME(ZONE_WRITE_LOCKED), |
332 | RQF_NAME(MQ_TIMEOUT_EXPIRED), | |
76a86f9d | 333 | RQF_NAME(MQ_POLL_SLEPT), |
8658dca8 | 334 | }; |
1a435111 | 335 | #undef RQF_NAME |
8658dca8 | 336 | |
daaadb3e | 337 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 338 | { |
2836ee4b | 339 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 340 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 341 | |
8658dca8 BVA |
342 | seq_printf(m, "%p {.op=", rq); |
343 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
344 | seq_printf(m, "%s", op_name[op]); | |
345 | else | |
346 | seq_printf(m, "%d", op); | |
347 | seq_puts(m, ", .cmd_flags="); | |
348 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
349 | ARRAY_SIZE(cmd_flag_name)); | |
350 | seq_puts(m, ", .rq_flags="); | |
351 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
352 | ARRAY_SIZE(rqf_name)); | |
e14575b3 | 353 | seq_printf(m, ", complete=%d", blk_rq_is_complete(rq)); |
2836ee4b | 354 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 355 | rq->internal_tag); |
2836ee4b BVA |
356 | if (mq_ops->show_rq) |
357 | mq_ops->show_rq(m, rq); | |
358 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
359 | return 0; |
360 | } | |
daaadb3e OS |
361 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
362 | ||
363 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
364 | { | |
365 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
366 | } | |
16b738f6 | 367 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
368 | |
369 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 370 | __acquires(&hctx->lock) |
950cd7e9 OS |
371 | { |
372 | struct blk_mq_hw_ctx *hctx = m->private; | |
373 | ||
374 | spin_lock(&hctx->lock); | |
375 | return seq_list_start(&hctx->dispatch, *pos); | |
376 | } | |
377 | ||
378 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
379 | { | |
380 | struct blk_mq_hw_ctx *hctx = m->private; | |
381 | ||
382 | return seq_list_next(v, &hctx->dispatch, pos); | |
383 | } | |
384 | ||
385 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 386 | __releases(&hctx->lock) |
950cd7e9 OS |
387 | { |
388 | struct blk_mq_hw_ctx *hctx = m->private; | |
389 | ||
390 | spin_unlock(&hctx->lock); | |
391 | } | |
392 | ||
393 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
394 | .start = hctx_dispatch_start, | |
395 | .next = hctx_dispatch_next, | |
396 | .stop = hctx_dispatch_stop, | |
397 | .show = blk_mq_debugfs_rq_show, | |
398 | }; | |
399 | ||
2720bab5 BVA |
400 | struct show_busy_params { |
401 | struct seq_file *m; | |
402 | struct blk_mq_hw_ctx *hctx; | |
403 | }; | |
404 | ||
405 | /* | |
406 | * Note: the state of a request may change while this function is in progress, | |
407 | * e.g. due to a concurrent blk_mq_finish_request() call. | |
408 | */ | |
409 | static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved) | |
410 | { | |
411 | const struct show_busy_params *params = data; | |
412 | ||
413 | if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx && | |
5a61c363 | 414 | blk_mq_rq_state(rq) != MQ_RQ_IDLE) |
2720bab5 BVA |
415 | __blk_mq_debugfs_rq_show(params->m, |
416 | list_entry_rq(&rq->queuelist)); | |
417 | } | |
418 | ||
419 | static int hctx_busy_show(void *data, struct seq_file *m) | |
420 | { | |
421 | struct blk_mq_hw_ctx *hctx = data; | |
422 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
423 | ||
424 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
425 | ¶ms); | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
f57de23a | 430 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 431 | { |
f57de23a | 432 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
433 | |
434 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
435 | return 0; | |
436 | } | |
437 | ||
d96b37c0 OS |
438 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
439 | struct blk_mq_tags *tags) | |
440 | { | |
441 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
442 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
443 | seq_printf(m, "active_queues=%d\n", | |
444 | atomic_read(&tags->active_queues)); | |
445 | ||
446 | seq_puts(m, "\nbitmap_tags:\n"); | |
447 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
448 | ||
449 | if (tags->nr_reserved_tags) { | |
450 | seq_puts(m, "\nbreserved_tags:\n"); | |
451 | sbitmap_queue_show(&tags->breserved_tags, m); | |
452 | } | |
453 | } | |
454 | ||
f57de23a | 455 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 456 | { |
f57de23a | 457 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 458 | struct request_queue *q = hctx->queue; |
8c0f14ea | 459 | int res; |
d96b37c0 | 460 | |
8c0f14ea BVA |
461 | res = mutex_lock_interruptible(&q->sysfs_lock); |
462 | if (res) | |
463 | goto out; | |
d96b37c0 OS |
464 | if (hctx->tags) |
465 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
466 | mutex_unlock(&q->sysfs_lock); | |
467 | ||
8c0f14ea BVA |
468 | out: |
469 | return res; | |
d96b37c0 OS |
470 | } |
471 | ||
f57de23a | 472 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 473 | { |
f57de23a | 474 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 475 | struct request_queue *q = hctx->queue; |
8c0f14ea | 476 | int res; |
d7e3621a | 477 | |
8c0f14ea BVA |
478 | res = mutex_lock_interruptible(&q->sysfs_lock); |
479 | if (res) | |
480 | goto out; | |
d7e3621a OS |
481 | if (hctx->tags) |
482 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
483 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
484 | |
485 | out: | |
486 | return res; | |
d7e3621a OS |
487 | } |
488 | ||
f57de23a | 489 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 490 | { |
f57de23a | 491 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 492 | struct request_queue *q = hctx->queue; |
8c0f14ea | 493 | int res; |
d96b37c0 | 494 | |
8c0f14ea BVA |
495 | res = mutex_lock_interruptible(&q->sysfs_lock); |
496 | if (res) | |
497 | goto out; | |
d96b37c0 OS |
498 | if (hctx->sched_tags) |
499 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
500 | mutex_unlock(&q->sysfs_lock); | |
501 | ||
8c0f14ea BVA |
502 | out: |
503 | return res; | |
d96b37c0 OS |
504 | } |
505 | ||
f57de23a | 506 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 507 | { |
f57de23a | 508 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 509 | struct request_queue *q = hctx->queue; |
8c0f14ea | 510 | int res; |
d7e3621a | 511 | |
8c0f14ea BVA |
512 | res = mutex_lock_interruptible(&q->sysfs_lock); |
513 | if (res) | |
514 | goto out; | |
d7e3621a OS |
515 | if (hctx->sched_tags) |
516 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
517 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
518 | |
519 | out: | |
520 | return res; | |
d7e3621a OS |
521 | } |
522 | ||
f57de23a | 523 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 524 | { |
f57de23a | 525 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
526 | |
527 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
528 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
529 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
530 | return 0; | |
531 | } | |
532 | ||
f57de23a | 533 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
534 | size_t count, loff_t *ppos) |
535 | { | |
f57de23a | 536 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
537 | |
538 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
539 | return count; | |
540 | } | |
541 | ||
f57de23a | 542 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 543 | { |
f57de23a | 544 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
545 | int i; |
546 | ||
547 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
548 | ||
549 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
550 | unsigned int d = 1U << (i - 1); | |
551 | ||
552 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
553 | } | |
554 | ||
555 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
556 | return 0; | |
557 | } | |
558 | ||
f57de23a | 559 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
560 | size_t count, loff_t *ppos) |
561 | { | |
f57de23a | 562 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
563 | int i; |
564 | ||
565 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
566 | hctx->dispatched[i] = 0; | |
567 | return count; | |
568 | } | |
569 | ||
f57de23a | 570 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 571 | { |
f57de23a | 572 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
573 | |
574 | seq_printf(m, "%lu\n", hctx->queued); | |
575 | return 0; | |
576 | } | |
577 | ||
f57de23a | 578 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
579 | size_t count, loff_t *ppos) |
580 | { | |
f57de23a | 581 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
582 | |
583 | hctx->queued = 0; | |
584 | return count; | |
585 | } | |
586 | ||
f57de23a | 587 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 588 | { |
f57de23a | 589 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
590 | |
591 | seq_printf(m, "%lu\n", hctx->run); | |
592 | return 0; | |
593 | } | |
594 | ||
f57de23a OS |
595 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
596 | loff_t *ppos) | |
4a46f05e | 597 | { |
f57de23a | 598 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
599 | |
600 | hctx->run = 0; | |
601 | return count; | |
602 | } | |
603 | ||
f57de23a | 604 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 605 | { |
f57de23a | 606 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
607 | |
608 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
609 | return 0; | |
610 | } | |
611 | ||
950cd7e9 | 612 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 613 | __acquires(&ctx->lock) |
950cd7e9 OS |
614 | { |
615 | struct blk_mq_ctx *ctx = m->private; | |
616 | ||
617 | spin_lock(&ctx->lock); | |
618 | return seq_list_start(&ctx->rq_list, *pos); | |
619 | } | |
620 | ||
621 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
622 | { | |
623 | struct blk_mq_ctx *ctx = m->private; | |
624 | ||
625 | return seq_list_next(v, &ctx->rq_list, pos); | |
626 | } | |
627 | ||
628 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 629 | __releases(&ctx->lock) |
950cd7e9 OS |
630 | { |
631 | struct blk_mq_ctx *ctx = m->private; | |
632 | ||
633 | spin_unlock(&ctx->lock); | |
634 | } | |
635 | ||
636 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
637 | .start = ctx_rq_list_start, | |
638 | .next = ctx_rq_list_next, | |
639 | .stop = ctx_rq_list_stop, | |
640 | .show = blk_mq_debugfs_rq_show, | |
641 | }; | |
f57de23a | 642 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 643 | { |
f57de23a | 644 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
645 | |
646 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
647 | return 0; | |
648 | } | |
649 | ||
f57de23a | 650 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
651 | size_t count, loff_t *ppos) |
652 | { | |
f57de23a | 653 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
654 | |
655 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
656 | return count; | |
657 | } | |
658 | ||
f57de23a | 659 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 660 | { |
f57de23a | 661 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
662 | |
663 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
664 | return 0; | |
665 | } | |
666 | ||
f57de23a OS |
667 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
668 | size_t count, loff_t *ppos) | |
4a46f05e | 669 | { |
f57de23a | 670 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
671 | |
672 | ctx->rq_merged = 0; | |
673 | return count; | |
674 | } | |
675 | ||
f57de23a | 676 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 677 | { |
f57de23a | 678 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
679 | |
680 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
681 | return 0; | |
682 | } | |
683 | ||
f57de23a OS |
684 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
685 | size_t count, loff_t *ppos) | |
4a46f05e | 686 | { |
f57de23a OS |
687 | struct blk_mq_ctx *ctx = data; |
688 | ||
689 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
690 | return count; | |
4a46f05e OS |
691 | } |
692 | ||
f57de23a OS |
693 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
694 | { | |
695 | const struct blk_mq_debugfs_attr *attr = m->private; | |
696 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
697 | ||
698 | return attr->show(data, m); | |
699 | } | |
700 | ||
701 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
702 | size_t count, loff_t *ppos) | |
4a46f05e OS |
703 | { |
704 | struct seq_file *m = file->private_data; | |
f57de23a OS |
705 | const struct blk_mq_debugfs_attr *attr = m->private; |
706 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 707 | |
6b136a24 EG |
708 | /* |
709 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
710 | * the same with 'data' in this case. | |
711 | */ | |
712 | if (attr == data || !attr->write) | |
f57de23a OS |
713 | return -EPERM; |
714 | ||
715 | return attr->write(data, buf, count, ppos); | |
716 | } | |
717 | ||
718 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
719 | { | |
720 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
721 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
722 | struct seq_file *m; | |
723 | int ret; | |
724 | ||
725 | if (attr->seq_ops) { | |
726 | ret = seq_open(file, attr->seq_ops); | |
727 | if (!ret) { | |
728 | m = file->private_data; | |
729 | m->private = data; | |
730 | } | |
731 | return ret; | |
732 | } | |
733 | ||
734 | if (WARN_ON_ONCE(!attr->show)) | |
735 | return -EPERM; | |
736 | ||
737 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
738 | } |
739 | ||
f57de23a OS |
740 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
741 | { | |
742 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
743 | ||
744 | if (attr->show) | |
745 | return single_release(inode, file); | |
746 | else | |
747 | return seq_release(inode, file); | |
748 | } | |
749 | ||
f8465933 | 750 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 751 | .open = blk_mq_debugfs_open, |
4a46f05e | 752 | .read = seq_read, |
f57de23a | 753 | .write = blk_mq_debugfs_write, |
4a46f05e | 754 | .llseek = seq_lseek, |
f57de23a | 755 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
756 | }; |
757 | ||
07e4fead | 758 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
759 | {"state", 0400, hctx_state_show}, |
760 | {"flags", 0400, hctx_flags_show}, | |
761 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 762 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
763 | {"ctx_map", 0400, hctx_ctx_map_show}, |
764 | {"tags", 0400, hctx_tags_show}, | |
765 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
766 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
767 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
768 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
769 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
770 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
771 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
772 | {"active", 0400, hctx_active_show}, | |
72f2f8f6 | 773 | {}, |
07e4fead OS |
774 | }; |
775 | ||
776 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
777 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
778 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
779 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
780 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 781 | {}, |
07e4fead OS |
782 | }; |
783 | ||
9c1051aa OS |
784 | static bool debugfs_create_files(struct dentry *parent, void *data, |
785 | const struct blk_mq_debugfs_attr *attr) | |
786 | { | |
787 | d_inode(parent)->i_private = data; | |
788 | ||
789 | for (; attr->name; attr++) { | |
790 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
791 | (void *)attr, &blk_mq_debugfs_fops)) | |
792 | return false; | |
793 | } | |
794 | return true; | |
795 | } | |
796 | ||
4c9e4019 | 797 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 798 | { |
9c1051aa OS |
799 | struct blk_mq_hw_ctx *hctx; |
800 | int i; | |
801 | ||
18fbda91 | 802 | if (!blk_debugfs_root) |
07e4fead OS |
803 | return -ENOENT; |
804 | ||
4c9e4019 BVA |
805 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
806 | blk_debugfs_root); | |
07e4fead | 807 | if (!q->debugfs_dir) |
9c1051aa | 808 | return -ENOMEM; |
07e4fead | 809 | |
9c1051aa OS |
810 | if (!debugfs_create_files(q->debugfs_dir, q, |
811 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
812 | goto err; |
813 | ||
9c1051aa | 814 | /* |
70e62f4b | 815 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
816 | * didn't exist yet (because we don't know what to name the directory |
817 | * until the queue is registered to a gendisk). | |
818 | */ | |
70e62f4b OS |
819 | if (q->elevator && !q->sched_debugfs_dir) |
820 | blk_mq_debugfs_register_sched(q); | |
821 | ||
822 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa OS |
823 | queue_for_each_hw_ctx(q, hctx, i) { |
824 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
825 | goto err; | |
d332ce09 OS |
826 | if (q->elevator && !hctx->sched_debugfs_dir && |
827 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
828 | goto err; | |
9c1051aa OS |
829 | } |
830 | ||
07e4fead OS |
831 | return 0; |
832 | ||
833 | err: | |
834 | blk_mq_debugfs_unregister(q); | |
835 | return -ENOMEM; | |
836 | } | |
837 | ||
838 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
839 | { | |
840 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 841 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
842 | q->debugfs_dir = NULL; |
843 | } | |
844 | ||
9c1051aa OS |
845 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
846 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
847 | { |
848 | struct dentry *ctx_dir; | |
849 | char name[20]; | |
07e4fead OS |
850 | |
851 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 852 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
853 | if (!ctx_dir) |
854 | return -ENOMEM; | |
855 | ||
72f2f8f6 BVA |
856 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
857 | return -ENOMEM; | |
07e4fead OS |
858 | |
859 | return 0; | |
860 | } | |
861 | ||
9c1051aa OS |
862 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
863 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
864 | { |
865 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
866 | char name[20]; |
867 | int i; | |
868 | ||
9c1051aa OS |
869 | if (!q->debugfs_dir) |
870 | return -ENOENT; | |
871 | ||
88aabbd7 | 872 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
873 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
874 | if (!hctx->debugfs_dir) | |
07e4fead OS |
875 | return -ENOMEM; |
876 | ||
9c1051aa OS |
877 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
878 | blk_mq_debugfs_hctx_attrs)) | |
879 | goto err; | |
07e4fead OS |
880 | |
881 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
882 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
883 | goto err; | |
07e4fead OS |
884 | } |
885 | ||
886 | return 0; | |
9c1051aa OS |
887 | |
888 | err: | |
889 | blk_mq_debugfs_unregister_hctx(hctx); | |
890 | return -ENOMEM; | |
891 | } | |
892 | ||
893 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
894 | { | |
895 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 896 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 897 | hctx->debugfs_dir = NULL; |
07e4fead OS |
898 | } |
899 | ||
9c1051aa | 900 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
901 | { |
902 | struct blk_mq_hw_ctx *hctx; | |
903 | int i; | |
904 | ||
07e4fead OS |
905 | queue_for_each_hw_ctx(q, hctx, i) { |
906 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 907 | return -ENOMEM; |
07e4fead OS |
908 | } |
909 | ||
910 | return 0; | |
07e4fead OS |
911 | } |
912 | ||
9c1051aa | 913 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 914 | { |
9c1051aa OS |
915 | struct blk_mq_hw_ctx *hctx; |
916 | int i; | |
917 | ||
918 | queue_for_each_hw_ctx(q, hctx, i) | |
919 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 920 | } |
d332ce09 OS |
921 | |
922 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
923 | { | |
924 | struct elevator_type *e = q->elevator->type; | |
925 | ||
926 | if (!q->debugfs_dir) | |
927 | return -ENOENT; | |
928 | ||
929 | if (!e->queue_debugfs_attrs) | |
930 | return 0; | |
931 | ||
932 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
933 | if (!q->sched_debugfs_dir) | |
934 | return -ENOMEM; | |
935 | ||
936 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
937 | e->queue_debugfs_attrs)) | |
938 | goto err; | |
939 | ||
940 | return 0; | |
941 | ||
942 | err: | |
943 | blk_mq_debugfs_unregister_sched(q); | |
944 | return -ENOMEM; | |
945 | } | |
946 | ||
947 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
948 | { | |
949 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
950 | q->sched_debugfs_dir = NULL; | |
951 | } | |
952 | ||
953 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, | |
954 | struct blk_mq_hw_ctx *hctx) | |
955 | { | |
956 | struct elevator_type *e = q->elevator->type; | |
957 | ||
958 | if (!hctx->debugfs_dir) | |
959 | return -ENOENT; | |
960 | ||
961 | if (!e->hctx_debugfs_attrs) | |
962 | return 0; | |
963 | ||
964 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
965 | hctx->debugfs_dir); | |
966 | if (!hctx->sched_debugfs_dir) | |
967 | return -ENOMEM; | |
968 | ||
969 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
970 | e->hctx_debugfs_attrs)) | |
971 | return -ENOMEM; | |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
976 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
977 | { | |
978 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
979 | hctx->sched_debugfs_dir = NULL; | |
980 | } |