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 | ||
cd84a62e BVA |
105 | static int queue_pm_only_show(void *data, struct seq_file *m) |
106 | { | |
107 | struct request_queue *q = data; | |
108 | ||
109 | seq_printf(m, "%d\n", atomic_read(&q->pm_only)); | |
110 | return 0; | |
111 | } | |
112 | ||
1a435111 | 113 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 114 | static const char *const blk_queue_flag_name[] = { |
1a435111 OS |
115 | QUEUE_FLAG_NAME(QUEUED), |
116 | QUEUE_FLAG_NAME(STOPPED), | |
1a435111 OS |
117 | QUEUE_FLAG_NAME(DYING), |
118 | QUEUE_FLAG_NAME(BYPASS), | |
119 | QUEUE_FLAG_NAME(BIDI), | |
120 | QUEUE_FLAG_NAME(NOMERGES), | |
121 | QUEUE_FLAG_NAME(SAME_COMP), | |
122 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
123 | QUEUE_FLAG_NAME(NONROT), |
124 | QUEUE_FLAG_NAME(IO_STAT), | |
125 | QUEUE_FLAG_NAME(DISCARD), | |
126 | QUEUE_FLAG_NAME(NOXMERGES), | |
127 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
128 | QUEUE_FLAG_NAME(SECERASE), | |
129 | QUEUE_FLAG_NAME(SAME_FORCE), | |
130 | QUEUE_FLAG_NAME(DEAD), | |
131 | QUEUE_FLAG_NAME(INIT_DONE), | |
132 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
133 | QUEUE_FLAG_NAME(POLL), | |
134 | QUEUE_FLAG_NAME(WC), | |
135 | QUEUE_FLAG_NAME(FUA), | |
136 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
137 | QUEUE_FLAG_NAME(DAX), | |
138 | QUEUE_FLAG_NAME(STATS), | |
139 | QUEUE_FLAG_NAME(POLL_STATS), | |
140 | QUEUE_FLAG_NAME(REGISTERED), | |
22d53821 BVA |
141 | QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), |
142 | QUEUE_FLAG_NAME(QUIESCED), | |
91d68905 | 143 | }; |
1a435111 | 144 | #undef QUEUE_FLAG_NAME |
91d68905 | 145 | |
f57de23a | 146 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 147 | { |
f57de23a | 148 | struct request_queue *q = data; |
91d68905 BVA |
149 | |
150 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
151 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 152 | seq_puts(m, "\n"); |
91d68905 BVA |
153 | return 0; |
154 | } | |
155 | ||
f57de23a OS |
156 | static ssize_t queue_state_write(void *data, const char __user *buf, |
157 | size_t count, loff_t *ppos) | |
91d68905 | 158 | { |
f57de23a | 159 | struct request_queue *q = data; |
71b90511 | 160 | char opbuf[16] = { }, *op; |
91d68905 | 161 | |
18d4d7d0 BVA |
162 | /* |
163 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
164 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
165 | * triggering a use-after-free. | |
166 | */ | |
167 | if (blk_queue_dead(q)) | |
168 | return -ENOENT; | |
169 | ||
71b90511 | 170 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
171 | pr_err("%s: operation too long\n", __func__); |
172 | goto inval; | |
173 | } | |
174 | ||
71b90511 | 175 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 176 | return -EFAULT; |
71b90511 | 177 | op = strstrip(opbuf); |
91d68905 BVA |
178 | if (strcmp(op, "run") == 0) { |
179 | blk_mq_run_hw_queues(q, true); | |
180 | } else if (strcmp(op, "start") == 0) { | |
181 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
182 | } else if (strcmp(op, "kick") == 0) { |
183 | blk_mq_kick_requeue_list(q); | |
91d68905 | 184 | } else { |
c7e4145a OS |
185 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
186 | inval: | |
edea55ab | 187 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
188 | return -EINVAL; |
189 | } | |
c7e4145a | 190 | return count; |
91d68905 BVA |
191 | } |
192 | ||
f793dfd3 JA |
193 | static int queue_write_hint_show(void *data, struct seq_file *m) |
194 | { | |
195 | struct request_queue *q = data; | |
196 | int i; | |
197 | ||
198 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
199 | seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static ssize_t queue_write_hint_store(void *data, const char __user *buf, | |
205 | size_t count, loff_t *ppos) | |
206 | { | |
207 | struct request_queue *q = data; | |
208 | int i; | |
209 | ||
210 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
211 | q->write_hints[i] = 0; | |
212 | ||
213 | return count; | |
214 | } | |
215 | ||
1209cb7f BVA |
216 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
217 | { "poll_stat", 0400, queue_poll_stat_show }, | |
218 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 219 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f BVA |
220 | { "state", 0600, queue_state_show, queue_state_write }, |
221 | { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store }, | |
18bc4230 | 222 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
223 | { }, |
224 | }; | |
34dbad5d | 225 | |
1a435111 | 226 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 227 | static const char *const hctx_state_name[] = { |
1a435111 OS |
228 | HCTX_STATE_NAME(STOPPED), |
229 | HCTX_STATE_NAME(TAG_ACTIVE), | |
230 | HCTX_STATE_NAME(SCHED_RESTART), | |
f5c0b091 | 231 | }; |
1a435111 OS |
232 | #undef HCTX_STATE_NAME |
233 | ||
f57de23a | 234 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 235 | { |
f57de23a | 236 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 237 | |
f5c0b091 BVA |
238 | blk_flags_show(m, hctx->state, hctx_state_name, |
239 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 240 | seq_puts(m, "\n"); |
9abb2ad2 OS |
241 | return 0; |
242 | } | |
243 | ||
1a435111 | 244 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 245 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
246 | BLK_TAG_ALLOC_NAME(FIFO), |
247 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 248 | }; |
1a435111 | 249 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 250 | |
1a435111 | 251 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 252 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
253 | HCTX_FLAG_NAME(SHOULD_MERGE), |
254 | HCTX_FLAG_NAME(TAG_SHARED), | |
255 | HCTX_FLAG_NAME(SG_MERGE), | |
256 | HCTX_FLAG_NAME(BLOCKING), | |
257 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 258 | }; |
1a435111 | 259 | #undef HCTX_FLAG_NAME |
f5c0b091 | 260 | |
f57de23a | 261 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 262 | { |
f57de23a | 263 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 264 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 265 | |
f5c0b091 BVA |
266 | seq_puts(m, "alloc_policy="); |
267 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
268 | alloc_policy_name[alloc_policy]) | |
269 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
270 | else | |
271 | seq_printf(m, "%d", alloc_policy); | |
272 | seq_puts(m, " "); | |
273 | blk_flags_show(m, | |
274 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
275 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 276 | seq_puts(m, "\n"); |
9abb2ad2 OS |
277 | return 0; |
278 | } | |
279 | ||
1a435111 | 280 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 281 | static const char *const op_name[] = { |
1a435111 OS |
282 | REQ_OP_NAME(READ), |
283 | REQ_OP_NAME(WRITE), | |
284 | REQ_OP_NAME(FLUSH), | |
285 | REQ_OP_NAME(DISCARD), | |
1a435111 OS |
286 | REQ_OP_NAME(SECURE_ERASE), |
287 | REQ_OP_NAME(ZONE_RESET), | |
288 | REQ_OP_NAME(WRITE_SAME), | |
289 | REQ_OP_NAME(WRITE_ZEROES), | |
290 | REQ_OP_NAME(SCSI_IN), | |
291 | REQ_OP_NAME(SCSI_OUT), | |
292 | REQ_OP_NAME(DRV_IN), | |
293 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 294 | }; |
1a435111 | 295 | #undef REQ_OP_NAME |
8658dca8 | 296 | |
1a435111 | 297 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 298 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
299 | CMD_FLAG_NAME(FAILFAST_DEV), |
300 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
301 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
302 | CMD_FLAG_NAME(SYNC), | |
303 | CMD_FLAG_NAME(META), | |
304 | CMD_FLAG_NAME(PRIO), | |
305 | CMD_FLAG_NAME(NOMERGE), | |
306 | CMD_FLAG_NAME(IDLE), | |
307 | CMD_FLAG_NAME(INTEGRITY), | |
308 | CMD_FLAG_NAME(FUA), | |
309 | CMD_FLAG_NAME(PREFLUSH), | |
310 | CMD_FLAG_NAME(RAHEAD), | |
311 | CMD_FLAG_NAME(BACKGROUND), | |
312 | CMD_FLAG_NAME(NOUNMAP), | |
22d53821 | 313 | CMD_FLAG_NAME(NOWAIT), |
8658dca8 | 314 | }; |
1a435111 | 315 | #undef CMD_FLAG_NAME |
8658dca8 | 316 | |
1a435111 | 317 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 318 | static const char *const rqf_name[] = { |
1a435111 | 319 | RQF_NAME(SORTED), |
85ba3eff | 320 | RQF_NAME(STARTED), |
1a435111 OS |
321 | RQF_NAME(QUEUED), |
322 | RQF_NAME(SOFTBARRIER), | |
323 | RQF_NAME(FLUSH_SEQ), | |
324 | RQF_NAME(MIXED_MERGE), | |
325 | RQF_NAME(MQ_INFLIGHT), | |
326 | RQF_NAME(DONTPREP), | |
327 | RQF_NAME(PREEMPT), | |
328 | RQF_NAME(COPY_USER), | |
329 | RQF_NAME(FAILED), | |
330 | RQF_NAME(QUIET), | |
331 | RQF_NAME(ELVPRIV), | |
332 | RQF_NAME(IO_STAT), | |
333 | RQF_NAME(ALLOCED), | |
334 | RQF_NAME(PM), | |
335 | RQF_NAME(HASHED), | |
336 | RQF_NAME(STATS), | |
337 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 338 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 339 | RQF_NAME(MQ_POLL_SLEPT), |
8658dca8 | 340 | }; |
1a435111 | 341 | #undef RQF_NAME |
8658dca8 | 342 | |
ec6dcf63 BVA |
343 | static const char *const blk_mq_rq_state_name_array[] = { |
344 | [MQ_RQ_IDLE] = "idle", | |
345 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
346 | [MQ_RQ_COMPLETE] = "complete", | |
347 | }; | |
348 | ||
349 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
350 | { | |
a1e79188 | 351 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
352 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
353 | return "(?)"; | |
354 | return blk_mq_rq_state_name_array[rq_state]; | |
355 | } | |
356 | ||
daaadb3e | 357 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 358 | { |
2836ee4b | 359 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 360 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 361 | |
8658dca8 BVA |
362 | seq_printf(m, "%p {.op=", rq); |
363 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
364 | seq_printf(m, "%s", op_name[op]); | |
365 | else | |
366 | seq_printf(m, "%d", op); | |
367 | seq_puts(m, ", .cmd_flags="); | |
368 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
369 | ARRAY_SIZE(cmd_flag_name)); | |
370 | seq_puts(m, ", .rq_flags="); | |
371 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
372 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 373 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 374 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 375 | rq->internal_tag); |
2836ee4b BVA |
376 | if (mq_ops->show_rq) |
377 | mq_ops->show_rq(m, rq); | |
378 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
379 | return 0; |
380 | } | |
daaadb3e OS |
381 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
382 | ||
383 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
384 | { | |
385 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
386 | } | |
16b738f6 | 387 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
388 | |
389 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 390 | __acquires(&hctx->lock) |
950cd7e9 OS |
391 | { |
392 | struct blk_mq_hw_ctx *hctx = m->private; | |
393 | ||
394 | spin_lock(&hctx->lock); | |
395 | return seq_list_start(&hctx->dispatch, *pos); | |
396 | } | |
397 | ||
398 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
399 | { | |
400 | struct blk_mq_hw_ctx *hctx = m->private; | |
401 | ||
402 | return seq_list_next(v, &hctx->dispatch, pos); | |
403 | } | |
404 | ||
405 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 406 | __releases(&hctx->lock) |
950cd7e9 OS |
407 | { |
408 | struct blk_mq_hw_ctx *hctx = m->private; | |
409 | ||
410 | spin_unlock(&hctx->lock); | |
411 | } | |
412 | ||
413 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
414 | .start = hctx_dispatch_start, | |
415 | .next = hctx_dispatch_next, | |
416 | .stop = hctx_dispatch_stop, | |
417 | .show = blk_mq_debugfs_rq_show, | |
418 | }; | |
419 | ||
2720bab5 BVA |
420 | struct show_busy_params { |
421 | struct seq_file *m; | |
422 | struct blk_mq_hw_ctx *hctx; | |
423 | }; | |
424 | ||
425 | /* | |
426 | * Note: the state of a request may change while this function is in progress, | |
427 | * e.g. due to a concurrent blk_mq_finish_request() call. | |
428 | */ | |
429 | static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved) | |
430 | { | |
431 | const struct show_busy_params *params = data; | |
432 | ||
6d8623a7 | 433 | if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx) |
2720bab5 BVA |
434 | __blk_mq_debugfs_rq_show(params->m, |
435 | list_entry_rq(&rq->queuelist)); | |
436 | } | |
437 | ||
438 | static int hctx_busy_show(void *data, struct seq_file *m) | |
439 | { | |
440 | struct blk_mq_hw_ctx *hctx = data; | |
441 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
442 | ||
443 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
444 | ¶ms); | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
f57de23a | 449 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 450 | { |
f57de23a | 451 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
452 | |
453 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
454 | return 0; | |
455 | } | |
456 | ||
d96b37c0 OS |
457 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
458 | struct blk_mq_tags *tags) | |
459 | { | |
460 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
461 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
462 | seq_printf(m, "active_queues=%d\n", | |
463 | atomic_read(&tags->active_queues)); | |
464 | ||
465 | seq_puts(m, "\nbitmap_tags:\n"); | |
466 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
467 | ||
468 | if (tags->nr_reserved_tags) { | |
469 | seq_puts(m, "\nbreserved_tags:\n"); | |
470 | sbitmap_queue_show(&tags->breserved_tags, m); | |
471 | } | |
472 | } | |
473 | ||
f57de23a | 474 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 475 | { |
f57de23a | 476 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 477 | struct request_queue *q = hctx->queue; |
8c0f14ea | 478 | int res; |
d96b37c0 | 479 | |
8c0f14ea BVA |
480 | res = mutex_lock_interruptible(&q->sysfs_lock); |
481 | if (res) | |
482 | goto out; | |
d96b37c0 OS |
483 | if (hctx->tags) |
484 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
485 | mutex_unlock(&q->sysfs_lock); | |
486 | ||
8c0f14ea BVA |
487 | out: |
488 | return res; | |
d96b37c0 OS |
489 | } |
490 | ||
f57de23a | 491 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 492 | { |
f57de23a | 493 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 494 | struct request_queue *q = hctx->queue; |
8c0f14ea | 495 | int res; |
d7e3621a | 496 | |
8c0f14ea BVA |
497 | res = mutex_lock_interruptible(&q->sysfs_lock); |
498 | if (res) | |
499 | goto out; | |
d7e3621a OS |
500 | if (hctx->tags) |
501 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
502 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
503 | |
504 | out: | |
505 | return res; | |
d7e3621a OS |
506 | } |
507 | ||
f57de23a | 508 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 509 | { |
f57de23a | 510 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 511 | struct request_queue *q = hctx->queue; |
8c0f14ea | 512 | int res; |
d96b37c0 | 513 | |
8c0f14ea BVA |
514 | res = mutex_lock_interruptible(&q->sysfs_lock); |
515 | if (res) | |
516 | goto out; | |
d96b37c0 OS |
517 | if (hctx->sched_tags) |
518 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
519 | mutex_unlock(&q->sysfs_lock); | |
520 | ||
8c0f14ea BVA |
521 | out: |
522 | return res; | |
d96b37c0 OS |
523 | } |
524 | ||
f57de23a | 525 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 526 | { |
f57de23a | 527 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 528 | struct request_queue *q = hctx->queue; |
8c0f14ea | 529 | int res; |
d7e3621a | 530 | |
8c0f14ea BVA |
531 | res = mutex_lock_interruptible(&q->sysfs_lock); |
532 | if (res) | |
533 | goto out; | |
d7e3621a OS |
534 | if (hctx->sched_tags) |
535 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
536 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
537 | |
538 | out: | |
539 | return res; | |
d7e3621a OS |
540 | } |
541 | ||
f57de23a | 542 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 543 | { |
f57de23a | 544 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
545 | |
546 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
547 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
548 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
549 | return 0; | |
550 | } | |
551 | ||
f57de23a | 552 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
553 | size_t count, loff_t *ppos) |
554 | { | |
f57de23a | 555 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
556 | |
557 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
558 | return count; | |
559 | } | |
560 | ||
f57de23a | 561 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 562 | { |
f57de23a | 563 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
564 | int i; |
565 | ||
566 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
567 | ||
568 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
569 | unsigned int d = 1U << (i - 1); | |
570 | ||
571 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
572 | } | |
573 | ||
574 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
575 | return 0; | |
576 | } | |
577 | ||
f57de23a | 578 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
579 | size_t count, loff_t *ppos) |
580 | { | |
f57de23a | 581 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
582 | int i; |
583 | ||
584 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
585 | hctx->dispatched[i] = 0; | |
586 | return count; | |
587 | } | |
588 | ||
f57de23a | 589 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 590 | { |
f57de23a | 591 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
592 | |
593 | seq_printf(m, "%lu\n", hctx->queued); | |
594 | return 0; | |
595 | } | |
596 | ||
f57de23a | 597 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
598 | size_t count, loff_t *ppos) |
599 | { | |
f57de23a | 600 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
601 | |
602 | hctx->queued = 0; | |
603 | return count; | |
604 | } | |
605 | ||
f57de23a | 606 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 607 | { |
f57de23a | 608 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
609 | |
610 | seq_printf(m, "%lu\n", hctx->run); | |
611 | return 0; | |
612 | } | |
613 | ||
f57de23a OS |
614 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
615 | loff_t *ppos) | |
4a46f05e | 616 | { |
f57de23a | 617 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
618 | |
619 | hctx->run = 0; | |
620 | return count; | |
621 | } | |
622 | ||
f57de23a | 623 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 624 | { |
f57de23a | 625 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
626 | |
627 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
628 | return 0; | |
629 | } | |
630 | ||
6e768717 ML |
631 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
632 | { | |
633 | struct blk_mq_hw_ctx *hctx = data; | |
634 | ||
635 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
636 | return 0; | |
637 | } | |
638 | ||
950cd7e9 | 639 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 640 | __acquires(&ctx->lock) |
950cd7e9 OS |
641 | { |
642 | struct blk_mq_ctx *ctx = m->private; | |
643 | ||
644 | spin_lock(&ctx->lock); | |
645 | return seq_list_start(&ctx->rq_list, *pos); | |
646 | } | |
647 | ||
648 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
649 | { | |
650 | struct blk_mq_ctx *ctx = m->private; | |
651 | ||
652 | return seq_list_next(v, &ctx->rq_list, pos); | |
653 | } | |
654 | ||
655 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 656 | __releases(&ctx->lock) |
950cd7e9 OS |
657 | { |
658 | struct blk_mq_ctx *ctx = m->private; | |
659 | ||
660 | spin_unlock(&ctx->lock); | |
661 | } | |
662 | ||
663 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
664 | .start = ctx_rq_list_start, | |
665 | .next = ctx_rq_list_next, | |
666 | .stop = ctx_rq_list_stop, | |
667 | .show = blk_mq_debugfs_rq_show, | |
668 | }; | |
f57de23a | 669 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 670 | { |
f57de23a | 671 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
672 | |
673 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
674 | return 0; | |
675 | } | |
676 | ||
f57de23a | 677 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
678 | size_t count, loff_t *ppos) |
679 | { | |
f57de23a | 680 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
681 | |
682 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
683 | return count; | |
684 | } | |
685 | ||
f57de23a | 686 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 687 | { |
f57de23a | 688 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
689 | |
690 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
691 | return 0; | |
692 | } | |
693 | ||
f57de23a OS |
694 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
695 | size_t count, loff_t *ppos) | |
4a46f05e | 696 | { |
f57de23a | 697 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
698 | |
699 | ctx->rq_merged = 0; | |
700 | return count; | |
701 | } | |
702 | ||
f57de23a | 703 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 704 | { |
f57de23a | 705 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
706 | |
707 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
708 | return 0; | |
709 | } | |
710 | ||
f57de23a OS |
711 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
712 | size_t count, loff_t *ppos) | |
4a46f05e | 713 | { |
f57de23a OS |
714 | struct blk_mq_ctx *ctx = data; |
715 | ||
716 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
717 | return count; | |
4a46f05e OS |
718 | } |
719 | ||
f57de23a OS |
720 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
721 | { | |
722 | const struct blk_mq_debugfs_attr *attr = m->private; | |
723 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
724 | ||
725 | return attr->show(data, m); | |
726 | } | |
727 | ||
728 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
729 | size_t count, loff_t *ppos) | |
4a46f05e OS |
730 | { |
731 | struct seq_file *m = file->private_data; | |
f57de23a OS |
732 | const struct blk_mq_debugfs_attr *attr = m->private; |
733 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 734 | |
6b136a24 EG |
735 | /* |
736 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
737 | * the same with 'data' in this case. | |
738 | */ | |
739 | if (attr == data || !attr->write) | |
f57de23a OS |
740 | return -EPERM; |
741 | ||
742 | return attr->write(data, buf, count, ppos); | |
743 | } | |
744 | ||
745 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
746 | { | |
747 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
748 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
749 | struct seq_file *m; | |
750 | int ret; | |
751 | ||
752 | if (attr->seq_ops) { | |
753 | ret = seq_open(file, attr->seq_ops); | |
754 | if (!ret) { | |
755 | m = file->private_data; | |
756 | m->private = data; | |
757 | } | |
758 | return ret; | |
759 | } | |
760 | ||
761 | if (WARN_ON_ONCE(!attr->show)) | |
762 | return -EPERM; | |
763 | ||
764 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
765 | } |
766 | ||
f57de23a OS |
767 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
768 | { | |
769 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
770 | ||
771 | if (attr->show) | |
772 | return single_release(inode, file); | |
773 | else | |
774 | return seq_release(inode, file); | |
775 | } | |
776 | ||
f8465933 | 777 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 778 | .open = blk_mq_debugfs_open, |
4a46f05e | 779 | .read = seq_read, |
f57de23a | 780 | .write = blk_mq_debugfs_write, |
4a46f05e | 781 | .llseek = seq_lseek, |
f57de23a | 782 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
783 | }; |
784 | ||
07e4fead | 785 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
786 | {"state", 0400, hctx_state_show}, |
787 | {"flags", 0400, hctx_flags_show}, | |
788 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 789 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
790 | {"ctx_map", 0400, hctx_ctx_map_show}, |
791 | {"tags", 0400, hctx_tags_show}, | |
792 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
793 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
794 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
795 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
796 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
797 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
798 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
799 | {"active", 0400, hctx_active_show}, | |
6e768717 | 800 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
72f2f8f6 | 801 | {}, |
07e4fead OS |
802 | }; |
803 | ||
804 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
805 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
806 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
807 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
808 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 809 | {}, |
07e4fead OS |
810 | }; |
811 | ||
9c1051aa OS |
812 | static bool debugfs_create_files(struct dentry *parent, void *data, |
813 | const struct blk_mq_debugfs_attr *attr) | |
814 | { | |
815 | d_inode(parent)->i_private = data; | |
816 | ||
817 | for (; attr->name; attr++) { | |
818 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
819 | (void *)attr, &blk_mq_debugfs_fops)) | |
820 | return false; | |
821 | } | |
822 | return true; | |
823 | } | |
824 | ||
4c9e4019 | 825 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 826 | { |
9c1051aa OS |
827 | struct blk_mq_hw_ctx *hctx; |
828 | int i; | |
829 | ||
18fbda91 | 830 | if (!blk_debugfs_root) |
07e4fead OS |
831 | return -ENOENT; |
832 | ||
4c9e4019 BVA |
833 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
834 | blk_debugfs_root); | |
07e4fead | 835 | if (!q->debugfs_dir) |
9c1051aa | 836 | return -ENOMEM; |
07e4fead | 837 | |
9c1051aa OS |
838 | if (!debugfs_create_files(q->debugfs_dir, q, |
839 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
840 | goto err; |
841 | ||
9c1051aa | 842 | /* |
70e62f4b | 843 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
844 | * didn't exist yet (because we don't know what to name the directory |
845 | * until the queue is registered to a gendisk). | |
846 | */ | |
70e62f4b OS |
847 | if (q->elevator && !q->sched_debugfs_dir) |
848 | blk_mq_debugfs_register_sched(q); | |
849 | ||
850 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa OS |
851 | queue_for_each_hw_ctx(q, hctx, i) { |
852 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
853 | goto err; | |
d332ce09 OS |
854 | if (q->elevator && !hctx->sched_debugfs_dir && |
855 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
856 | goto err; | |
9c1051aa OS |
857 | } |
858 | ||
07e4fead OS |
859 | return 0; |
860 | ||
861 | err: | |
862 | blk_mq_debugfs_unregister(q); | |
863 | return -ENOMEM; | |
864 | } | |
865 | ||
866 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
867 | { | |
868 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 869 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
870 | q->debugfs_dir = NULL; |
871 | } | |
872 | ||
9c1051aa OS |
873 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
874 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
875 | { |
876 | struct dentry *ctx_dir; | |
877 | char name[20]; | |
07e4fead OS |
878 | |
879 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 880 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
881 | if (!ctx_dir) |
882 | return -ENOMEM; | |
883 | ||
72f2f8f6 BVA |
884 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
885 | return -ENOMEM; | |
07e4fead OS |
886 | |
887 | return 0; | |
888 | } | |
889 | ||
9c1051aa OS |
890 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
891 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
892 | { |
893 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
894 | char name[20]; |
895 | int i; | |
896 | ||
9c1051aa OS |
897 | if (!q->debugfs_dir) |
898 | return -ENOENT; | |
899 | ||
88aabbd7 | 900 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
901 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
902 | if (!hctx->debugfs_dir) | |
07e4fead OS |
903 | return -ENOMEM; |
904 | ||
9c1051aa OS |
905 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
906 | blk_mq_debugfs_hctx_attrs)) | |
907 | goto err; | |
07e4fead OS |
908 | |
909 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
910 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
911 | goto err; | |
07e4fead OS |
912 | } |
913 | ||
914 | return 0; | |
9c1051aa OS |
915 | |
916 | err: | |
917 | blk_mq_debugfs_unregister_hctx(hctx); | |
918 | return -ENOMEM; | |
919 | } | |
920 | ||
921 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
922 | { | |
923 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 924 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 925 | hctx->debugfs_dir = NULL; |
07e4fead OS |
926 | } |
927 | ||
9c1051aa | 928 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
929 | { |
930 | struct blk_mq_hw_ctx *hctx; | |
931 | int i; | |
932 | ||
07e4fead OS |
933 | queue_for_each_hw_ctx(q, hctx, i) { |
934 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 935 | return -ENOMEM; |
07e4fead OS |
936 | } |
937 | ||
938 | return 0; | |
07e4fead OS |
939 | } |
940 | ||
9c1051aa | 941 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 942 | { |
9c1051aa OS |
943 | struct blk_mq_hw_ctx *hctx; |
944 | int i; | |
945 | ||
946 | queue_for_each_hw_ctx(q, hctx, i) | |
947 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 948 | } |
d332ce09 OS |
949 | |
950 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
951 | { | |
952 | struct elevator_type *e = q->elevator->type; | |
953 | ||
954 | if (!q->debugfs_dir) | |
955 | return -ENOENT; | |
956 | ||
957 | if (!e->queue_debugfs_attrs) | |
958 | return 0; | |
959 | ||
960 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
961 | if (!q->sched_debugfs_dir) | |
962 | return -ENOMEM; | |
963 | ||
964 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
965 | e->queue_debugfs_attrs)) | |
966 | goto err; | |
967 | ||
968 | return 0; | |
969 | ||
970 | err: | |
971 | blk_mq_debugfs_unregister_sched(q); | |
972 | return -ENOMEM; | |
973 | } | |
974 | ||
975 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
976 | { | |
977 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
978 | q->sched_debugfs_dir = NULL; | |
979 | } | |
980 | ||
981 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, | |
982 | struct blk_mq_hw_ctx *hctx) | |
983 | { | |
984 | struct elevator_type *e = q->elevator->type; | |
985 | ||
986 | if (!hctx->debugfs_dir) | |
987 | return -ENOENT; | |
988 | ||
989 | if (!e->hctx_debugfs_attrs) | |
990 | return 0; | |
991 | ||
992 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
993 | hctx->debugfs_dir); | |
994 | if (!hctx->sched_debugfs_dir) | |
995 | return -ENOMEM; | |
996 | ||
997 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
998 | e->hctx_debugfs_attrs)) | |
999 | return -ENOMEM; | |
1000 | ||
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
1005 | { | |
1006 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
1007 | hctx->sched_debugfs_dir = NULL; | |
1008 | } |