Commit | Line | Data |
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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 | |
91d68905 BVA |
27 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
28 | const char *const *flag_name, int flag_name_count) | |
29 | { | |
30 | bool sep = false; | |
31 | int i; | |
32 | ||
33 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
34 | if (!(flags & BIT(i))) | |
35 | continue; | |
36 | if (sep) | |
bec03d6b | 37 | seq_puts(m, "|"); |
91d68905 BVA |
38 | sep = true; |
39 | if (i < flag_name_count && flag_name[i]) | |
40 | seq_puts(m, flag_name[i]); | |
41 | else | |
42 | seq_printf(m, "%d", i); | |
43 | } | |
91d68905 BVA |
44 | return 0; |
45 | } | |
46 | ||
1a435111 | 47 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 48 | static const char *const blk_queue_flag_name[] = { |
1a435111 OS |
49 | QUEUE_FLAG_NAME(QUEUED), |
50 | QUEUE_FLAG_NAME(STOPPED), | |
1a435111 OS |
51 | QUEUE_FLAG_NAME(DYING), |
52 | QUEUE_FLAG_NAME(BYPASS), | |
53 | QUEUE_FLAG_NAME(BIDI), | |
54 | QUEUE_FLAG_NAME(NOMERGES), | |
55 | QUEUE_FLAG_NAME(SAME_COMP), | |
56 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
57 | QUEUE_FLAG_NAME(NONROT), |
58 | QUEUE_FLAG_NAME(IO_STAT), | |
59 | QUEUE_FLAG_NAME(DISCARD), | |
60 | QUEUE_FLAG_NAME(NOXMERGES), | |
61 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
62 | QUEUE_FLAG_NAME(SECERASE), | |
63 | QUEUE_FLAG_NAME(SAME_FORCE), | |
64 | QUEUE_FLAG_NAME(DEAD), | |
65 | QUEUE_FLAG_NAME(INIT_DONE), | |
66 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
67 | QUEUE_FLAG_NAME(POLL), | |
68 | QUEUE_FLAG_NAME(WC), | |
69 | QUEUE_FLAG_NAME(FUA), | |
70 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
71 | QUEUE_FLAG_NAME(DAX), | |
72 | QUEUE_FLAG_NAME(STATS), | |
73 | QUEUE_FLAG_NAME(POLL_STATS), | |
74 | QUEUE_FLAG_NAME(REGISTERED), | |
22d53821 BVA |
75 | QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), |
76 | QUEUE_FLAG_NAME(QUIESCED), | |
c9254f2d | 77 | QUEUE_FLAG_NAME(PREEMPT_ONLY), |
91d68905 | 78 | }; |
1a435111 | 79 | #undef QUEUE_FLAG_NAME |
91d68905 | 80 | |
f57de23a | 81 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 82 | { |
f57de23a | 83 | struct request_queue *q = data; |
91d68905 BVA |
84 | |
85 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
86 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 87 | seq_puts(m, "\n"); |
91d68905 BVA |
88 | return 0; |
89 | } | |
90 | ||
f57de23a OS |
91 | static ssize_t queue_state_write(void *data, const char __user *buf, |
92 | size_t count, loff_t *ppos) | |
91d68905 | 93 | { |
f57de23a | 94 | struct request_queue *q = data; |
71b90511 | 95 | char opbuf[16] = { }, *op; |
91d68905 | 96 | |
18d4d7d0 BVA |
97 | /* |
98 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
99 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
100 | * triggering a use-after-free. | |
101 | */ | |
102 | if (blk_queue_dead(q)) | |
103 | return -ENOENT; | |
104 | ||
71b90511 | 105 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
106 | pr_err("%s: operation too long\n", __func__); |
107 | goto inval; | |
108 | } | |
109 | ||
71b90511 | 110 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 111 | return -EFAULT; |
71b90511 | 112 | op = strstrip(opbuf); |
91d68905 BVA |
113 | if (strcmp(op, "run") == 0) { |
114 | blk_mq_run_hw_queues(q, true); | |
115 | } else if (strcmp(op, "start") == 0) { | |
116 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
117 | } else if (strcmp(op, "kick") == 0) { |
118 | blk_mq_kick_requeue_list(q); | |
91d68905 | 119 | } else { |
c7e4145a OS |
120 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
121 | inval: | |
edea55ab | 122 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
123 | return -EINVAL; |
124 | } | |
c7e4145a | 125 | return count; |
91d68905 BVA |
126 | } |
127 | ||
34dbad5d OS |
128 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
129 | { | |
130 | if (stat->nr_samples) { | |
131 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
132 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
133 | } else { | |
134 | seq_puts(m, "samples=0"); | |
135 | } | |
136 | } | |
137 | ||
f793dfd3 JA |
138 | static int queue_write_hint_show(void *data, struct seq_file *m) |
139 | { | |
140 | struct request_queue *q = data; | |
141 | int i; | |
142 | ||
143 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
144 | seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static ssize_t queue_write_hint_store(void *data, const char __user *buf, | |
150 | size_t count, loff_t *ppos) | |
151 | { | |
152 | struct request_queue *q = data; | |
153 | int i; | |
154 | ||
155 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
156 | q->write_hints[i] = 0; | |
157 | ||
158 | return count; | |
159 | } | |
160 | ||
f57de23a | 161 | static int queue_poll_stat_show(void *data, struct seq_file *m) |
34dbad5d | 162 | { |
f57de23a | 163 | struct request_queue *q = data; |
0206319f | 164 | int bucket; |
34dbad5d | 165 | |
0206319f SB |
166 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
167 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
168 | print_stat(m, &q->poll_stat[2*bucket]); | |
169 | seq_puts(m, "\n"); | |
34dbad5d | 170 | |
0206319f SB |
171 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
172 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
173 | seq_puts(m, "\n"); | |
174 | } | |
34dbad5d OS |
175 | return 0; |
176 | } | |
177 | ||
1a435111 | 178 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 179 | static const char *const hctx_state_name[] = { |
1a435111 OS |
180 | HCTX_STATE_NAME(STOPPED), |
181 | HCTX_STATE_NAME(TAG_ACTIVE), | |
182 | HCTX_STATE_NAME(SCHED_RESTART), | |
1a435111 | 183 | HCTX_STATE_NAME(START_ON_RUN), |
f5c0b091 | 184 | }; |
1a435111 OS |
185 | #undef HCTX_STATE_NAME |
186 | ||
f57de23a | 187 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 188 | { |
f57de23a | 189 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 190 | |
f5c0b091 BVA |
191 | blk_flags_show(m, hctx->state, hctx_state_name, |
192 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 193 | seq_puts(m, "\n"); |
9abb2ad2 OS |
194 | return 0; |
195 | } | |
196 | ||
1a435111 | 197 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 198 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
199 | BLK_TAG_ALLOC_NAME(FIFO), |
200 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 201 | }; |
1a435111 | 202 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 203 | |
1a435111 | 204 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 205 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
206 | HCTX_FLAG_NAME(SHOULD_MERGE), |
207 | HCTX_FLAG_NAME(TAG_SHARED), | |
208 | HCTX_FLAG_NAME(SG_MERGE), | |
209 | HCTX_FLAG_NAME(BLOCKING), | |
210 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 211 | }; |
1a435111 | 212 | #undef HCTX_FLAG_NAME |
f5c0b091 | 213 | |
f57de23a | 214 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 215 | { |
f57de23a | 216 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 217 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 218 | |
f5c0b091 BVA |
219 | seq_puts(m, "alloc_policy="); |
220 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
221 | alloc_policy_name[alloc_policy]) | |
222 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
223 | else | |
224 | seq_printf(m, "%d", alloc_policy); | |
225 | seq_puts(m, " "); | |
226 | blk_flags_show(m, | |
227 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
228 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 229 | seq_puts(m, "\n"); |
9abb2ad2 OS |
230 | return 0; |
231 | } | |
232 | ||
1a435111 | 233 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 234 | static const char *const op_name[] = { |
1a435111 OS |
235 | REQ_OP_NAME(READ), |
236 | REQ_OP_NAME(WRITE), | |
237 | REQ_OP_NAME(FLUSH), | |
238 | REQ_OP_NAME(DISCARD), | |
239 | REQ_OP_NAME(ZONE_REPORT), | |
240 | REQ_OP_NAME(SECURE_ERASE), | |
241 | REQ_OP_NAME(ZONE_RESET), | |
242 | REQ_OP_NAME(WRITE_SAME), | |
243 | REQ_OP_NAME(WRITE_ZEROES), | |
244 | REQ_OP_NAME(SCSI_IN), | |
245 | REQ_OP_NAME(SCSI_OUT), | |
246 | REQ_OP_NAME(DRV_IN), | |
247 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 248 | }; |
1a435111 | 249 | #undef REQ_OP_NAME |
8658dca8 | 250 | |
1a435111 | 251 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 252 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
253 | CMD_FLAG_NAME(FAILFAST_DEV), |
254 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
255 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
256 | CMD_FLAG_NAME(SYNC), | |
257 | CMD_FLAG_NAME(META), | |
258 | CMD_FLAG_NAME(PRIO), | |
259 | CMD_FLAG_NAME(NOMERGE), | |
260 | CMD_FLAG_NAME(IDLE), | |
261 | CMD_FLAG_NAME(INTEGRITY), | |
262 | CMD_FLAG_NAME(FUA), | |
263 | CMD_FLAG_NAME(PREFLUSH), | |
264 | CMD_FLAG_NAME(RAHEAD), | |
265 | CMD_FLAG_NAME(BACKGROUND), | |
266 | CMD_FLAG_NAME(NOUNMAP), | |
22d53821 | 267 | CMD_FLAG_NAME(NOWAIT), |
8658dca8 | 268 | }; |
1a435111 | 269 | #undef CMD_FLAG_NAME |
8658dca8 | 270 | |
1a435111 | 271 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 272 | static const char *const rqf_name[] = { |
1a435111 | 273 | RQF_NAME(SORTED), |
85ba3eff | 274 | RQF_NAME(STARTED), |
1a435111 OS |
275 | RQF_NAME(QUEUED), |
276 | RQF_NAME(SOFTBARRIER), | |
277 | RQF_NAME(FLUSH_SEQ), | |
278 | RQF_NAME(MIXED_MERGE), | |
279 | RQF_NAME(MQ_INFLIGHT), | |
280 | RQF_NAME(DONTPREP), | |
281 | RQF_NAME(PREEMPT), | |
282 | RQF_NAME(COPY_USER), | |
283 | RQF_NAME(FAILED), | |
284 | RQF_NAME(QUIET), | |
285 | RQF_NAME(ELVPRIV), | |
286 | RQF_NAME(IO_STAT), | |
287 | RQF_NAME(ALLOCED), | |
288 | RQF_NAME(PM), | |
289 | RQF_NAME(HASHED), | |
290 | RQF_NAME(STATS), | |
291 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 JA |
292 | RQF_NAME(ZONE_WRITE_LOCKED), |
293 | RQF_NAME(MQ_TIMEOUT_EXPIRED), | |
76a86f9d | 294 | RQF_NAME(MQ_POLL_SLEPT), |
8658dca8 | 295 | }; |
1a435111 | 296 | #undef RQF_NAME |
8658dca8 | 297 | |
daaadb3e | 298 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 299 | { |
2836ee4b | 300 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 301 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 302 | |
8658dca8 BVA |
303 | seq_printf(m, "%p {.op=", rq); |
304 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
305 | seq_printf(m, "%s", op_name[op]); | |
306 | else | |
307 | seq_printf(m, "%d", op); | |
308 | seq_puts(m, ", .cmd_flags="); | |
309 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
310 | ARRAY_SIZE(cmd_flag_name)); | |
311 | seq_puts(m, ", .rq_flags="); | |
312 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
313 | ARRAY_SIZE(rqf_name)); | |
e14575b3 | 314 | seq_printf(m, ", complete=%d", blk_rq_is_complete(rq)); |
2836ee4b | 315 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 316 | rq->internal_tag); |
2836ee4b BVA |
317 | if (mq_ops->show_rq) |
318 | mq_ops->show_rq(m, rq); | |
319 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
320 | return 0; |
321 | } | |
daaadb3e OS |
322 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
323 | ||
324 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
325 | { | |
326 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
327 | } | |
16b738f6 | 328 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 | 329 | |
8ef1a191 BVA |
330 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) |
331 | __acquires(&q->requeue_lock) | |
332 | { | |
333 | struct request_queue *q = m->private; | |
334 | ||
335 | spin_lock_irq(&q->requeue_lock); | |
336 | return seq_list_start(&q->requeue_list, *pos); | |
337 | } | |
338 | ||
339 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
340 | { | |
341 | struct request_queue *q = m->private; | |
342 | ||
343 | return seq_list_next(v, &q->requeue_list, pos); | |
344 | } | |
345 | ||
346 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
347 | __releases(&q->requeue_lock) | |
348 | { | |
349 | struct request_queue *q = m->private; | |
350 | ||
351 | spin_unlock_irq(&q->requeue_lock); | |
352 | } | |
353 | ||
354 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
355 | .start = queue_requeue_list_start, | |
356 | .next = queue_requeue_list_next, | |
357 | .stop = queue_requeue_list_stop, | |
358 | .show = blk_mq_debugfs_rq_show, | |
359 | }; | |
360 | ||
950cd7e9 | 361 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 362 | __acquires(&hctx->lock) |
950cd7e9 OS |
363 | { |
364 | struct blk_mq_hw_ctx *hctx = m->private; | |
365 | ||
366 | spin_lock(&hctx->lock); | |
367 | return seq_list_start(&hctx->dispatch, *pos); | |
368 | } | |
369 | ||
370 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
371 | { | |
372 | struct blk_mq_hw_ctx *hctx = m->private; | |
373 | ||
374 | return seq_list_next(v, &hctx->dispatch, pos); | |
375 | } | |
376 | ||
377 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 378 | __releases(&hctx->lock) |
950cd7e9 OS |
379 | { |
380 | struct blk_mq_hw_ctx *hctx = m->private; | |
381 | ||
382 | spin_unlock(&hctx->lock); | |
383 | } | |
384 | ||
385 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
386 | .start = hctx_dispatch_start, | |
387 | .next = hctx_dispatch_next, | |
388 | .stop = hctx_dispatch_stop, | |
389 | .show = blk_mq_debugfs_rq_show, | |
390 | }; | |
391 | ||
2720bab5 BVA |
392 | struct show_busy_params { |
393 | struct seq_file *m; | |
394 | struct blk_mq_hw_ctx *hctx; | |
395 | }; | |
396 | ||
397 | /* | |
398 | * Note: the state of a request may change while this function is in progress, | |
399 | * e.g. due to a concurrent blk_mq_finish_request() call. | |
400 | */ | |
401 | static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved) | |
402 | { | |
403 | const struct show_busy_params *params = data; | |
404 | ||
405 | if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx && | |
5a61c363 | 406 | blk_mq_rq_state(rq) != MQ_RQ_IDLE) |
2720bab5 BVA |
407 | __blk_mq_debugfs_rq_show(params->m, |
408 | list_entry_rq(&rq->queuelist)); | |
409 | } | |
410 | ||
411 | static int hctx_busy_show(void *data, struct seq_file *m) | |
412 | { | |
413 | struct blk_mq_hw_ctx *hctx = data; | |
414 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
415 | ||
416 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
417 | ¶ms); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
f57de23a | 422 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 423 | { |
f57de23a | 424 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
425 | |
426 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
427 | return 0; | |
428 | } | |
429 | ||
d96b37c0 OS |
430 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
431 | struct blk_mq_tags *tags) | |
432 | { | |
433 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
434 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
435 | seq_printf(m, "active_queues=%d\n", | |
436 | atomic_read(&tags->active_queues)); | |
437 | ||
438 | seq_puts(m, "\nbitmap_tags:\n"); | |
439 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
440 | ||
441 | if (tags->nr_reserved_tags) { | |
442 | seq_puts(m, "\nbreserved_tags:\n"); | |
443 | sbitmap_queue_show(&tags->breserved_tags, m); | |
444 | } | |
445 | } | |
446 | ||
f57de23a | 447 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 448 | { |
f57de23a | 449 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 450 | struct request_queue *q = hctx->queue; |
8c0f14ea | 451 | int res; |
d96b37c0 | 452 | |
8c0f14ea BVA |
453 | res = mutex_lock_interruptible(&q->sysfs_lock); |
454 | if (res) | |
455 | goto out; | |
d96b37c0 OS |
456 | if (hctx->tags) |
457 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
458 | mutex_unlock(&q->sysfs_lock); | |
459 | ||
8c0f14ea BVA |
460 | out: |
461 | return res; | |
d96b37c0 OS |
462 | } |
463 | ||
f57de23a | 464 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 465 | { |
f57de23a | 466 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 467 | struct request_queue *q = hctx->queue; |
8c0f14ea | 468 | int res; |
d7e3621a | 469 | |
8c0f14ea BVA |
470 | res = mutex_lock_interruptible(&q->sysfs_lock); |
471 | if (res) | |
472 | goto out; | |
d7e3621a OS |
473 | if (hctx->tags) |
474 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
475 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
476 | |
477 | out: | |
478 | return res; | |
d7e3621a OS |
479 | } |
480 | ||
f57de23a | 481 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 482 | { |
f57de23a | 483 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 484 | struct request_queue *q = hctx->queue; |
8c0f14ea | 485 | int res; |
d96b37c0 | 486 | |
8c0f14ea BVA |
487 | res = mutex_lock_interruptible(&q->sysfs_lock); |
488 | if (res) | |
489 | goto out; | |
d96b37c0 OS |
490 | if (hctx->sched_tags) |
491 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
492 | mutex_unlock(&q->sysfs_lock); | |
493 | ||
8c0f14ea BVA |
494 | out: |
495 | return res; | |
d96b37c0 OS |
496 | } |
497 | ||
f57de23a | 498 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 499 | { |
f57de23a | 500 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 501 | struct request_queue *q = hctx->queue; |
8c0f14ea | 502 | int res; |
d7e3621a | 503 | |
8c0f14ea BVA |
504 | res = mutex_lock_interruptible(&q->sysfs_lock); |
505 | if (res) | |
506 | goto out; | |
d7e3621a OS |
507 | if (hctx->sched_tags) |
508 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
509 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
510 | |
511 | out: | |
512 | return res; | |
d7e3621a OS |
513 | } |
514 | ||
f57de23a | 515 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 516 | { |
f57de23a | 517 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
518 | |
519 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
520 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
521 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
522 | return 0; | |
523 | } | |
524 | ||
f57de23a | 525 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
526 | size_t count, loff_t *ppos) |
527 | { | |
f57de23a | 528 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
529 | |
530 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
531 | return count; | |
532 | } | |
533 | ||
f57de23a | 534 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 535 | { |
f57de23a | 536 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
537 | int i; |
538 | ||
539 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
540 | ||
541 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
542 | unsigned int d = 1U << (i - 1); | |
543 | ||
544 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
545 | } | |
546 | ||
547 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
548 | return 0; | |
549 | } | |
550 | ||
f57de23a | 551 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
552 | size_t count, loff_t *ppos) |
553 | { | |
f57de23a | 554 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
555 | int i; |
556 | ||
557 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
558 | hctx->dispatched[i] = 0; | |
559 | return count; | |
560 | } | |
561 | ||
f57de23a | 562 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 563 | { |
f57de23a | 564 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
565 | |
566 | seq_printf(m, "%lu\n", hctx->queued); | |
567 | return 0; | |
568 | } | |
569 | ||
f57de23a | 570 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
571 | size_t count, loff_t *ppos) |
572 | { | |
f57de23a | 573 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
574 | |
575 | hctx->queued = 0; | |
576 | return count; | |
577 | } | |
578 | ||
f57de23a | 579 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 580 | { |
f57de23a | 581 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
582 | |
583 | seq_printf(m, "%lu\n", hctx->run); | |
584 | return 0; | |
585 | } | |
586 | ||
f57de23a OS |
587 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
588 | loff_t *ppos) | |
4a46f05e | 589 | { |
f57de23a | 590 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
591 | |
592 | hctx->run = 0; | |
593 | return count; | |
594 | } | |
595 | ||
f57de23a | 596 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 597 | { |
f57de23a | 598 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
599 | |
600 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
601 | return 0; | |
602 | } | |
603 | ||
950cd7e9 | 604 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 605 | __acquires(&ctx->lock) |
950cd7e9 OS |
606 | { |
607 | struct blk_mq_ctx *ctx = m->private; | |
608 | ||
609 | spin_lock(&ctx->lock); | |
610 | return seq_list_start(&ctx->rq_list, *pos); | |
611 | } | |
612 | ||
613 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
614 | { | |
615 | struct blk_mq_ctx *ctx = m->private; | |
616 | ||
617 | return seq_list_next(v, &ctx->rq_list, pos); | |
618 | } | |
619 | ||
620 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 621 | __releases(&ctx->lock) |
950cd7e9 OS |
622 | { |
623 | struct blk_mq_ctx *ctx = m->private; | |
624 | ||
625 | spin_unlock(&ctx->lock); | |
626 | } | |
627 | ||
628 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
629 | .start = ctx_rq_list_start, | |
630 | .next = ctx_rq_list_next, | |
631 | .stop = ctx_rq_list_stop, | |
632 | .show = blk_mq_debugfs_rq_show, | |
633 | }; | |
f57de23a | 634 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 635 | { |
f57de23a | 636 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
637 | |
638 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
639 | return 0; | |
640 | } | |
641 | ||
f57de23a | 642 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
643 | size_t count, loff_t *ppos) |
644 | { | |
f57de23a | 645 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
646 | |
647 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
648 | return count; | |
649 | } | |
650 | ||
f57de23a | 651 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 652 | { |
f57de23a | 653 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
654 | |
655 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
656 | return 0; | |
657 | } | |
658 | ||
f57de23a OS |
659 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
660 | size_t count, loff_t *ppos) | |
4a46f05e | 661 | { |
f57de23a | 662 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
663 | |
664 | ctx->rq_merged = 0; | |
665 | return count; | |
666 | } | |
667 | ||
f57de23a | 668 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 669 | { |
f57de23a | 670 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
671 | |
672 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
673 | return 0; | |
674 | } | |
675 | ||
f57de23a OS |
676 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
677 | size_t count, loff_t *ppos) | |
4a46f05e | 678 | { |
f57de23a OS |
679 | struct blk_mq_ctx *ctx = data; |
680 | ||
681 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
682 | return count; | |
4a46f05e OS |
683 | } |
684 | ||
f57de23a OS |
685 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
686 | { | |
687 | const struct blk_mq_debugfs_attr *attr = m->private; | |
688 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
689 | ||
690 | return attr->show(data, m); | |
691 | } | |
692 | ||
693 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
694 | size_t count, loff_t *ppos) | |
4a46f05e OS |
695 | { |
696 | struct seq_file *m = file->private_data; | |
f57de23a OS |
697 | const struct blk_mq_debugfs_attr *attr = m->private; |
698 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 699 | |
6b136a24 EG |
700 | /* |
701 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
702 | * the same with 'data' in this case. | |
703 | */ | |
704 | if (attr == data || !attr->write) | |
f57de23a OS |
705 | return -EPERM; |
706 | ||
707 | return attr->write(data, buf, count, ppos); | |
708 | } | |
709 | ||
710 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
711 | { | |
712 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
713 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
714 | struct seq_file *m; | |
715 | int ret; | |
716 | ||
717 | if (attr->seq_ops) { | |
718 | ret = seq_open(file, attr->seq_ops); | |
719 | if (!ret) { | |
720 | m = file->private_data; | |
721 | m->private = data; | |
722 | } | |
723 | return ret; | |
724 | } | |
725 | ||
726 | if (WARN_ON_ONCE(!attr->show)) | |
727 | return -EPERM; | |
728 | ||
729 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
730 | } |
731 | ||
f57de23a OS |
732 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
733 | { | |
734 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
735 | ||
736 | if (attr->show) | |
737 | return single_release(inode, file); | |
738 | else | |
739 | return seq_release(inode, file); | |
740 | } | |
741 | ||
f8465933 | 742 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 743 | .open = blk_mq_debugfs_open, |
4a46f05e | 744 | .read = seq_read, |
f57de23a | 745 | .write = blk_mq_debugfs_write, |
4a46f05e | 746 | .llseek = seq_lseek, |
f57de23a | 747 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
748 | }; |
749 | ||
34dbad5d | 750 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
f57de23a | 751 | {"poll_stat", 0400, queue_poll_stat_show}, |
8ef1a191 | 752 | {"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops}, |
f57de23a | 753 | {"state", 0600, queue_state_show, queue_state_write}, |
f793dfd3 | 754 | {"write_hints", 0600, queue_write_hint_show, queue_write_hint_store}, |
34dbad5d OS |
755 | {}, |
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 | } |