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 | |
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 }, | |
18bc4230 | 214 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
215 | { }, |
216 | }; | |
34dbad5d | 217 | |
1a435111 | 218 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 219 | static const char *const hctx_state_name[] = { |
1a435111 OS |
220 | HCTX_STATE_NAME(STOPPED), |
221 | HCTX_STATE_NAME(TAG_ACTIVE), | |
222 | HCTX_STATE_NAME(SCHED_RESTART), | |
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 | 331 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 332 | RQF_NAME(MQ_POLL_SLEPT), |
8658dca8 | 333 | }; |
1a435111 | 334 | #undef RQF_NAME |
8658dca8 | 335 | |
ec6dcf63 BVA |
336 | static const char *const blk_mq_rq_state_name_array[] = { |
337 | [MQ_RQ_IDLE] = "idle", | |
338 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
339 | [MQ_RQ_COMPLETE] = "complete", | |
340 | }; | |
341 | ||
342 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
343 | { | |
a1e79188 | 344 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
345 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
346 | return "(?)"; | |
347 | return blk_mq_rq_state_name_array[rq_state]; | |
348 | } | |
349 | ||
daaadb3e | 350 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 351 | { |
2836ee4b | 352 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 353 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 354 | |
8658dca8 BVA |
355 | seq_printf(m, "%p {.op=", rq); |
356 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
357 | seq_printf(m, "%s", op_name[op]); | |
358 | else | |
359 | seq_printf(m, "%d", op); | |
360 | seq_puts(m, ", .cmd_flags="); | |
361 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
362 | ARRAY_SIZE(cmd_flag_name)); | |
363 | seq_puts(m, ", .rq_flags="); | |
364 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
365 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 366 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 367 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 368 | rq->internal_tag); |
2836ee4b BVA |
369 | if (mq_ops->show_rq) |
370 | mq_ops->show_rq(m, rq); | |
371 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
372 | return 0; |
373 | } | |
daaadb3e OS |
374 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
375 | ||
376 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
377 | { | |
378 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
379 | } | |
16b738f6 | 380 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
381 | |
382 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 383 | __acquires(&hctx->lock) |
950cd7e9 OS |
384 | { |
385 | struct blk_mq_hw_ctx *hctx = m->private; | |
386 | ||
387 | spin_lock(&hctx->lock); | |
388 | return seq_list_start(&hctx->dispatch, *pos); | |
389 | } | |
390 | ||
391 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
392 | { | |
393 | struct blk_mq_hw_ctx *hctx = m->private; | |
394 | ||
395 | return seq_list_next(v, &hctx->dispatch, pos); | |
396 | } | |
397 | ||
398 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 399 | __releases(&hctx->lock) |
950cd7e9 OS |
400 | { |
401 | struct blk_mq_hw_ctx *hctx = m->private; | |
402 | ||
403 | spin_unlock(&hctx->lock); | |
404 | } | |
405 | ||
406 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
407 | .start = hctx_dispatch_start, | |
408 | .next = hctx_dispatch_next, | |
409 | .stop = hctx_dispatch_stop, | |
410 | .show = blk_mq_debugfs_rq_show, | |
411 | }; | |
412 | ||
2720bab5 BVA |
413 | struct show_busy_params { |
414 | struct seq_file *m; | |
415 | struct blk_mq_hw_ctx *hctx; | |
416 | }; | |
417 | ||
418 | /* | |
419 | * Note: the state of a request may change while this function is in progress, | |
420 | * e.g. due to a concurrent blk_mq_finish_request() call. | |
421 | */ | |
422 | static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved) | |
423 | { | |
424 | const struct show_busy_params *params = data; | |
425 | ||
426 | if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx && | |
5a61c363 | 427 | blk_mq_rq_state(rq) != MQ_RQ_IDLE) |
2720bab5 BVA |
428 | __blk_mq_debugfs_rq_show(params->m, |
429 | list_entry_rq(&rq->queuelist)); | |
430 | } | |
431 | ||
432 | static int hctx_busy_show(void *data, struct seq_file *m) | |
433 | { | |
434 | struct blk_mq_hw_ctx *hctx = data; | |
435 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
436 | ||
437 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
438 | ¶ms); | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
f57de23a | 443 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 444 | { |
f57de23a | 445 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
446 | |
447 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
448 | return 0; | |
449 | } | |
450 | ||
d96b37c0 OS |
451 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
452 | struct blk_mq_tags *tags) | |
453 | { | |
454 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
455 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
456 | seq_printf(m, "active_queues=%d\n", | |
457 | atomic_read(&tags->active_queues)); | |
458 | ||
459 | seq_puts(m, "\nbitmap_tags:\n"); | |
460 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
461 | ||
462 | if (tags->nr_reserved_tags) { | |
463 | seq_puts(m, "\nbreserved_tags:\n"); | |
464 | sbitmap_queue_show(&tags->breserved_tags, m); | |
465 | } | |
466 | } | |
467 | ||
f57de23a | 468 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 469 | { |
f57de23a | 470 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 471 | struct request_queue *q = hctx->queue; |
8c0f14ea | 472 | int res; |
d96b37c0 | 473 | |
8c0f14ea BVA |
474 | res = mutex_lock_interruptible(&q->sysfs_lock); |
475 | if (res) | |
476 | goto out; | |
d96b37c0 OS |
477 | if (hctx->tags) |
478 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
479 | mutex_unlock(&q->sysfs_lock); | |
480 | ||
8c0f14ea BVA |
481 | out: |
482 | return res; | |
d96b37c0 OS |
483 | } |
484 | ||
f57de23a | 485 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 486 | { |
f57de23a | 487 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 488 | struct request_queue *q = hctx->queue; |
8c0f14ea | 489 | int res; |
d7e3621a | 490 | |
8c0f14ea BVA |
491 | res = mutex_lock_interruptible(&q->sysfs_lock); |
492 | if (res) | |
493 | goto out; | |
d7e3621a OS |
494 | if (hctx->tags) |
495 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
496 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
497 | |
498 | out: | |
499 | return res; | |
d7e3621a OS |
500 | } |
501 | ||
f57de23a | 502 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 503 | { |
f57de23a | 504 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 505 | struct request_queue *q = hctx->queue; |
8c0f14ea | 506 | int res; |
d96b37c0 | 507 | |
8c0f14ea BVA |
508 | res = mutex_lock_interruptible(&q->sysfs_lock); |
509 | if (res) | |
510 | goto out; | |
d96b37c0 OS |
511 | if (hctx->sched_tags) |
512 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
513 | mutex_unlock(&q->sysfs_lock); | |
514 | ||
8c0f14ea BVA |
515 | out: |
516 | return res; | |
d96b37c0 OS |
517 | } |
518 | ||
f57de23a | 519 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 520 | { |
f57de23a | 521 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 522 | struct request_queue *q = hctx->queue; |
8c0f14ea | 523 | int res; |
d7e3621a | 524 | |
8c0f14ea BVA |
525 | res = mutex_lock_interruptible(&q->sysfs_lock); |
526 | if (res) | |
527 | goto out; | |
d7e3621a OS |
528 | if (hctx->sched_tags) |
529 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
530 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
531 | |
532 | out: | |
533 | return res; | |
d7e3621a OS |
534 | } |
535 | ||
f57de23a | 536 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 537 | { |
f57de23a | 538 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
539 | |
540 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
541 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
542 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
543 | return 0; | |
544 | } | |
545 | ||
f57de23a | 546 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
547 | size_t count, loff_t *ppos) |
548 | { | |
f57de23a | 549 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
550 | |
551 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
552 | return count; | |
553 | } | |
554 | ||
f57de23a | 555 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 556 | { |
f57de23a | 557 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
558 | int i; |
559 | ||
560 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
561 | ||
562 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
563 | unsigned int d = 1U << (i - 1); | |
564 | ||
565 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
566 | } | |
567 | ||
568 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
569 | return 0; | |
570 | } | |
571 | ||
f57de23a | 572 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
573 | size_t count, loff_t *ppos) |
574 | { | |
f57de23a | 575 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
576 | int i; |
577 | ||
578 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
579 | hctx->dispatched[i] = 0; | |
580 | return count; | |
581 | } | |
582 | ||
f57de23a | 583 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 584 | { |
f57de23a | 585 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
586 | |
587 | seq_printf(m, "%lu\n", hctx->queued); | |
588 | return 0; | |
589 | } | |
590 | ||
f57de23a | 591 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
592 | size_t count, loff_t *ppos) |
593 | { | |
f57de23a | 594 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
595 | |
596 | hctx->queued = 0; | |
597 | return count; | |
598 | } | |
599 | ||
f57de23a | 600 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 601 | { |
f57de23a | 602 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
603 | |
604 | seq_printf(m, "%lu\n", hctx->run); | |
605 | return 0; | |
606 | } | |
607 | ||
f57de23a OS |
608 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
609 | loff_t *ppos) | |
4a46f05e | 610 | { |
f57de23a | 611 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
612 | |
613 | hctx->run = 0; | |
614 | return count; | |
615 | } | |
616 | ||
f57de23a | 617 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 618 | { |
f57de23a | 619 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
620 | |
621 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
622 | return 0; | |
623 | } | |
624 | ||
6e768717 ML |
625 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
626 | { | |
627 | struct blk_mq_hw_ctx *hctx = data; | |
628 | ||
629 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
630 | return 0; | |
631 | } | |
632 | ||
950cd7e9 | 633 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 634 | __acquires(&ctx->lock) |
950cd7e9 OS |
635 | { |
636 | struct blk_mq_ctx *ctx = m->private; | |
637 | ||
638 | spin_lock(&ctx->lock); | |
639 | return seq_list_start(&ctx->rq_list, *pos); | |
640 | } | |
641 | ||
642 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
643 | { | |
644 | struct blk_mq_ctx *ctx = m->private; | |
645 | ||
646 | return seq_list_next(v, &ctx->rq_list, pos); | |
647 | } | |
648 | ||
649 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 650 | __releases(&ctx->lock) |
950cd7e9 OS |
651 | { |
652 | struct blk_mq_ctx *ctx = m->private; | |
653 | ||
654 | spin_unlock(&ctx->lock); | |
655 | } | |
656 | ||
657 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
658 | .start = ctx_rq_list_start, | |
659 | .next = ctx_rq_list_next, | |
660 | .stop = ctx_rq_list_stop, | |
661 | .show = blk_mq_debugfs_rq_show, | |
662 | }; | |
f57de23a | 663 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 664 | { |
f57de23a | 665 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
666 | |
667 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
668 | return 0; | |
669 | } | |
670 | ||
f57de23a | 671 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
672 | size_t count, loff_t *ppos) |
673 | { | |
f57de23a | 674 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
675 | |
676 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
677 | return count; | |
678 | } | |
679 | ||
f57de23a | 680 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 681 | { |
f57de23a | 682 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
683 | |
684 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
685 | return 0; | |
686 | } | |
687 | ||
f57de23a OS |
688 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
689 | size_t count, loff_t *ppos) | |
4a46f05e | 690 | { |
f57de23a | 691 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
692 | |
693 | ctx->rq_merged = 0; | |
694 | return count; | |
695 | } | |
696 | ||
f57de23a | 697 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 698 | { |
f57de23a | 699 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
700 | |
701 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
702 | return 0; | |
703 | } | |
704 | ||
f57de23a OS |
705 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
706 | size_t count, loff_t *ppos) | |
4a46f05e | 707 | { |
f57de23a OS |
708 | struct blk_mq_ctx *ctx = data; |
709 | ||
710 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
711 | return count; | |
4a46f05e OS |
712 | } |
713 | ||
f57de23a OS |
714 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
715 | { | |
716 | const struct blk_mq_debugfs_attr *attr = m->private; | |
717 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
718 | ||
719 | return attr->show(data, m); | |
720 | } | |
721 | ||
722 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
723 | size_t count, loff_t *ppos) | |
4a46f05e OS |
724 | { |
725 | struct seq_file *m = file->private_data; | |
f57de23a OS |
726 | const struct blk_mq_debugfs_attr *attr = m->private; |
727 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 728 | |
6b136a24 EG |
729 | /* |
730 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
731 | * the same with 'data' in this case. | |
732 | */ | |
733 | if (attr == data || !attr->write) | |
f57de23a OS |
734 | return -EPERM; |
735 | ||
736 | return attr->write(data, buf, count, ppos); | |
737 | } | |
738 | ||
739 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
740 | { | |
741 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
742 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
743 | struct seq_file *m; | |
744 | int ret; | |
745 | ||
746 | if (attr->seq_ops) { | |
747 | ret = seq_open(file, attr->seq_ops); | |
748 | if (!ret) { | |
749 | m = file->private_data; | |
750 | m->private = data; | |
751 | } | |
752 | return ret; | |
753 | } | |
754 | ||
755 | if (WARN_ON_ONCE(!attr->show)) | |
756 | return -EPERM; | |
757 | ||
758 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
759 | } |
760 | ||
f57de23a OS |
761 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
762 | { | |
763 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
764 | ||
765 | if (attr->show) | |
766 | return single_release(inode, file); | |
767 | else | |
768 | return seq_release(inode, file); | |
769 | } | |
770 | ||
f8465933 | 771 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 772 | .open = blk_mq_debugfs_open, |
4a46f05e | 773 | .read = seq_read, |
f57de23a | 774 | .write = blk_mq_debugfs_write, |
4a46f05e | 775 | .llseek = seq_lseek, |
f57de23a | 776 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
777 | }; |
778 | ||
07e4fead | 779 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
780 | {"state", 0400, hctx_state_show}, |
781 | {"flags", 0400, hctx_flags_show}, | |
782 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 783 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
784 | {"ctx_map", 0400, hctx_ctx_map_show}, |
785 | {"tags", 0400, hctx_tags_show}, | |
786 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
787 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
788 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
789 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
790 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
791 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
792 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
793 | {"active", 0400, hctx_active_show}, | |
6e768717 | 794 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
72f2f8f6 | 795 | {}, |
07e4fead OS |
796 | }; |
797 | ||
798 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
799 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
800 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
801 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
802 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 803 | {}, |
07e4fead OS |
804 | }; |
805 | ||
9c1051aa OS |
806 | static bool debugfs_create_files(struct dentry *parent, void *data, |
807 | const struct blk_mq_debugfs_attr *attr) | |
808 | { | |
809 | d_inode(parent)->i_private = data; | |
810 | ||
811 | for (; attr->name; attr++) { | |
812 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
813 | (void *)attr, &blk_mq_debugfs_fops)) | |
814 | return false; | |
815 | } | |
816 | return true; | |
817 | } | |
818 | ||
4c9e4019 | 819 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 820 | { |
9c1051aa OS |
821 | struct blk_mq_hw_ctx *hctx; |
822 | int i; | |
823 | ||
18fbda91 | 824 | if (!blk_debugfs_root) |
07e4fead OS |
825 | return -ENOENT; |
826 | ||
4c9e4019 BVA |
827 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
828 | blk_debugfs_root); | |
07e4fead | 829 | if (!q->debugfs_dir) |
9c1051aa | 830 | return -ENOMEM; |
07e4fead | 831 | |
9c1051aa OS |
832 | if (!debugfs_create_files(q->debugfs_dir, q, |
833 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
834 | goto err; |
835 | ||
9c1051aa | 836 | /* |
70e62f4b | 837 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
838 | * didn't exist yet (because we don't know what to name the directory |
839 | * until the queue is registered to a gendisk). | |
840 | */ | |
70e62f4b OS |
841 | if (q->elevator && !q->sched_debugfs_dir) |
842 | blk_mq_debugfs_register_sched(q); | |
843 | ||
844 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa OS |
845 | queue_for_each_hw_ctx(q, hctx, i) { |
846 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
847 | goto err; | |
d332ce09 OS |
848 | if (q->elevator && !hctx->sched_debugfs_dir && |
849 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
850 | goto err; | |
9c1051aa OS |
851 | } |
852 | ||
07e4fead OS |
853 | return 0; |
854 | ||
855 | err: | |
856 | blk_mq_debugfs_unregister(q); | |
857 | return -ENOMEM; | |
858 | } | |
859 | ||
860 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
861 | { | |
862 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 863 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
864 | q->debugfs_dir = NULL; |
865 | } | |
866 | ||
9c1051aa OS |
867 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
868 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
869 | { |
870 | struct dentry *ctx_dir; | |
871 | char name[20]; | |
07e4fead OS |
872 | |
873 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 874 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
875 | if (!ctx_dir) |
876 | return -ENOMEM; | |
877 | ||
72f2f8f6 BVA |
878 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
879 | return -ENOMEM; | |
07e4fead OS |
880 | |
881 | return 0; | |
882 | } | |
883 | ||
9c1051aa OS |
884 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
885 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
886 | { |
887 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
888 | char name[20]; |
889 | int i; | |
890 | ||
9c1051aa OS |
891 | if (!q->debugfs_dir) |
892 | return -ENOENT; | |
893 | ||
88aabbd7 | 894 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
895 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
896 | if (!hctx->debugfs_dir) | |
07e4fead OS |
897 | return -ENOMEM; |
898 | ||
9c1051aa OS |
899 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
900 | blk_mq_debugfs_hctx_attrs)) | |
901 | goto err; | |
07e4fead OS |
902 | |
903 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
904 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
905 | goto err; | |
07e4fead OS |
906 | } |
907 | ||
908 | return 0; | |
9c1051aa OS |
909 | |
910 | err: | |
911 | blk_mq_debugfs_unregister_hctx(hctx); | |
912 | return -ENOMEM; | |
913 | } | |
914 | ||
915 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
916 | { | |
917 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 918 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 919 | hctx->debugfs_dir = NULL; |
07e4fead OS |
920 | } |
921 | ||
9c1051aa | 922 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
923 | { |
924 | struct blk_mq_hw_ctx *hctx; | |
925 | int i; | |
926 | ||
07e4fead OS |
927 | queue_for_each_hw_ctx(q, hctx, i) { |
928 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 929 | return -ENOMEM; |
07e4fead OS |
930 | } |
931 | ||
932 | return 0; | |
07e4fead OS |
933 | } |
934 | ||
9c1051aa | 935 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 936 | { |
9c1051aa OS |
937 | struct blk_mq_hw_ctx *hctx; |
938 | int i; | |
939 | ||
940 | queue_for_each_hw_ctx(q, hctx, i) | |
941 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 942 | } |
d332ce09 OS |
943 | |
944 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
945 | { | |
946 | struct elevator_type *e = q->elevator->type; | |
947 | ||
948 | if (!q->debugfs_dir) | |
949 | return -ENOENT; | |
950 | ||
951 | if (!e->queue_debugfs_attrs) | |
952 | return 0; | |
953 | ||
954 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
955 | if (!q->sched_debugfs_dir) | |
956 | return -ENOMEM; | |
957 | ||
958 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
959 | e->queue_debugfs_attrs)) | |
960 | goto err; | |
961 | ||
962 | return 0; | |
963 | ||
964 | err: | |
965 | blk_mq_debugfs_unregister_sched(q); | |
966 | return -ENOMEM; | |
967 | } | |
968 | ||
969 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
970 | { | |
971 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
972 | q->sched_debugfs_dir = NULL; | |
973 | } | |
974 | ||
975 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, | |
976 | struct blk_mq_hw_ctx *hctx) | |
977 | { | |
978 | struct elevator_type *e = q->elevator->type; | |
979 | ||
980 | if (!hctx->debugfs_dir) | |
981 | return -ENOENT; | |
982 | ||
983 | if (!e->hctx_debugfs_attrs) | |
984 | return 0; | |
985 | ||
986 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
987 | hctx->debugfs_dir); | |
988 | if (!hctx->sched_debugfs_dir) | |
989 | return -ENOMEM; | |
990 | ||
991 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
992 | e->hctx_debugfs_attrs)) | |
993 | return -ENOMEM; | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
999 | { | |
1000 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
1001 | hctx->sched_debugfs_dir = NULL; | |
1002 | } |