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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), | |
51 | QUEUE_FLAG_NAME(SYNCFULL), | |
52 | QUEUE_FLAG_NAME(ASYNCFULL), | |
53 | QUEUE_FLAG_NAME(DYING), | |
54 | QUEUE_FLAG_NAME(BYPASS), | |
55 | QUEUE_FLAG_NAME(BIDI), | |
56 | QUEUE_FLAG_NAME(NOMERGES), | |
57 | QUEUE_FLAG_NAME(SAME_COMP), | |
58 | QUEUE_FLAG_NAME(FAIL_IO), | |
59 | QUEUE_FLAG_NAME(STACKABLE), | |
60 | QUEUE_FLAG_NAME(NONROT), | |
61 | QUEUE_FLAG_NAME(IO_STAT), | |
62 | QUEUE_FLAG_NAME(DISCARD), | |
63 | QUEUE_FLAG_NAME(NOXMERGES), | |
64 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
65 | QUEUE_FLAG_NAME(SECERASE), | |
66 | QUEUE_FLAG_NAME(SAME_FORCE), | |
67 | QUEUE_FLAG_NAME(DEAD), | |
68 | QUEUE_FLAG_NAME(INIT_DONE), | |
69 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
70 | QUEUE_FLAG_NAME(POLL), | |
71 | QUEUE_FLAG_NAME(WC), | |
72 | QUEUE_FLAG_NAME(FUA), | |
73 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
74 | QUEUE_FLAG_NAME(DAX), | |
75 | QUEUE_FLAG_NAME(STATS), | |
76 | QUEUE_FLAG_NAME(POLL_STATS), | |
77 | QUEUE_FLAG_NAME(REGISTERED), | |
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); | |
117 | } else { | |
c7e4145a OS |
118 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
119 | inval: | |
120 | pr_err("%s: use either 'run' or 'start'\n", __func__); | |
91d68905 BVA |
121 | return -EINVAL; |
122 | } | |
c7e4145a | 123 | return count; |
91d68905 BVA |
124 | } |
125 | ||
34dbad5d OS |
126 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
127 | { | |
128 | if (stat->nr_samples) { | |
129 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
130 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
131 | } else { | |
132 | seq_puts(m, "samples=0"); | |
133 | } | |
134 | } | |
135 | ||
f57de23a | 136 | static int queue_poll_stat_show(void *data, struct seq_file *m) |
34dbad5d | 137 | { |
f57de23a | 138 | struct request_queue *q = data; |
0206319f | 139 | int bucket; |
34dbad5d | 140 | |
0206319f SB |
141 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
142 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
143 | print_stat(m, &q->poll_stat[2*bucket]); | |
144 | seq_puts(m, "\n"); | |
34dbad5d | 145 | |
0206319f SB |
146 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
147 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
148 | seq_puts(m, "\n"); | |
149 | } | |
34dbad5d OS |
150 | return 0; |
151 | } | |
152 | ||
1a435111 | 153 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 154 | static const char *const hctx_state_name[] = { |
1a435111 OS |
155 | HCTX_STATE_NAME(STOPPED), |
156 | HCTX_STATE_NAME(TAG_ACTIVE), | |
157 | HCTX_STATE_NAME(SCHED_RESTART), | |
158 | HCTX_STATE_NAME(TAG_WAITING), | |
159 | HCTX_STATE_NAME(START_ON_RUN), | |
f5c0b091 | 160 | }; |
1a435111 OS |
161 | #undef HCTX_STATE_NAME |
162 | ||
f57de23a | 163 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 164 | { |
f57de23a | 165 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 166 | |
f5c0b091 BVA |
167 | blk_flags_show(m, hctx->state, hctx_state_name, |
168 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 169 | seq_puts(m, "\n"); |
9abb2ad2 OS |
170 | return 0; |
171 | } | |
172 | ||
1a435111 | 173 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 174 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
175 | BLK_TAG_ALLOC_NAME(FIFO), |
176 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 177 | }; |
1a435111 | 178 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 179 | |
1a435111 | 180 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 181 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
182 | HCTX_FLAG_NAME(SHOULD_MERGE), |
183 | HCTX_FLAG_NAME(TAG_SHARED), | |
184 | HCTX_FLAG_NAME(SG_MERGE), | |
185 | HCTX_FLAG_NAME(BLOCKING), | |
186 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 187 | }; |
1a435111 | 188 | #undef HCTX_FLAG_NAME |
f5c0b091 | 189 | |
f57de23a | 190 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 191 | { |
f57de23a | 192 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 193 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 194 | |
f5c0b091 BVA |
195 | seq_puts(m, "alloc_policy="); |
196 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
197 | alloc_policy_name[alloc_policy]) | |
198 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
199 | else | |
200 | seq_printf(m, "%d", alloc_policy); | |
201 | seq_puts(m, " "); | |
202 | blk_flags_show(m, | |
203 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
204 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 205 | seq_puts(m, "\n"); |
9abb2ad2 OS |
206 | return 0; |
207 | } | |
208 | ||
1a435111 | 209 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 210 | static const char *const op_name[] = { |
1a435111 OS |
211 | REQ_OP_NAME(READ), |
212 | REQ_OP_NAME(WRITE), | |
213 | REQ_OP_NAME(FLUSH), | |
214 | REQ_OP_NAME(DISCARD), | |
215 | REQ_OP_NAME(ZONE_REPORT), | |
216 | REQ_OP_NAME(SECURE_ERASE), | |
217 | REQ_OP_NAME(ZONE_RESET), | |
218 | REQ_OP_NAME(WRITE_SAME), | |
219 | REQ_OP_NAME(WRITE_ZEROES), | |
220 | REQ_OP_NAME(SCSI_IN), | |
221 | REQ_OP_NAME(SCSI_OUT), | |
222 | REQ_OP_NAME(DRV_IN), | |
223 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 224 | }; |
1a435111 | 225 | #undef REQ_OP_NAME |
8658dca8 | 226 | |
1a435111 | 227 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 228 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
229 | CMD_FLAG_NAME(FAILFAST_DEV), |
230 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
231 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
232 | CMD_FLAG_NAME(SYNC), | |
233 | CMD_FLAG_NAME(META), | |
234 | CMD_FLAG_NAME(PRIO), | |
235 | CMD_FLAG_NAME(NOMERGE), | |
236 | CMD_FLAG_NAME(IDLE), | |
237 | CMD_FLAG_NAME(INTEGRITY), | |
238 | CMD_FLAG_NAME(FUA), | |
239 | CMD_FLAG_NAME(PREFLUSH), | |
240 | CMD_FLAG_NAME(RAHEAD), | |
241 | CMD_FLAG_NAME(BACKGROUND), | |
242 | CMD_FLAG_NAME(NOUNMAP), | |
8658dca8 | 243 | }; |
1a435111 | 244 | #undef CMD_FLAG_NAME |
8658dca8 | 245 | |
1a435111 | 246 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 247 | static const char *const rqf_name[] = { |
1a435111 OS |
248 | RQF_NAME(SORTED), |
249 | RQF_NAME(STARTED), | |
250 | RQF_NAME(QUEUED), | |
251 | RQF_NAME(SOFTBARRIER), | |
252 | RQF_NAME(FLUSH_SEQ), | |
253 | RQF_NAME(MIXED_MERGE), | |
254 | RQF_NAME(MQ_INFLIGHT), | |
255 | RQF_NAME(DONTPREP), | |
256 | RQF_NAME(PREEMPT), | |
257 | RQF_NAME(COPY_USER), | |
258 | RQF_NAME(FAILED), | |
259 | RQF_NAME(QUIET), | |
260 | RQF_NAME(ELVPRIV), | |
261 | RQF_NAME(IO_STAT), | |
262 | RQF_NAME(ALLOCED), | |
263 | RQF_NAME(PM), | |
264 | RQF_NAME(HASHED), | |
265 | RQF_NAME(STATS), | |
266 | RQF_NAME(SPECIAL_PAYLOAD), | |
8658dca8 | 267 | }; |
1a435111 | 268 | #undef RQF_NAME |
8658dca8 | 269 | |
c0cb1c6d BVA |
270 | #define RQAF_NAME(name) [REQ_ATOM_##name] = #name |
271 | static const char *const rqaf_name[] = { | |
272 | RQAF_NAME(COMPLETE), | |
273 | RQAF_NAME(STARTED), | |
274 | RQAF_NAME(POLL_SLEPT), | |
275 | }; | |
276 | #undef RQAF_NAME | |
277 | ||
daaadb3e | 278 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 279 | { |
2836ee4b | 280 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 281 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 282 | |
8658dca8 BVA |
283 | seq_printf(m, "%p {.op=", rq); |
284 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
285 | seq_printf(m, "%s", op_name[op]); | |
286 | else | |
287 | seq_printf(m, "%d", op); | |
288 | seq_puts(m, ", .cmd_flags="); | |
289 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
290 | ARRAY_SIZE(cmd_flag_name)); | |
291 | seq_puts(m, ", .rq_flags="); | |
292 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
293 | ARRAY_SIZE(rqf_name)); | |
c0cb1c6d BVA |
294 | seq_puts(m, ", .atomic_flags="); |
295 | blk_flags_show(m, rq->atomic_flags, rqaf_name, ARRAY_SIZE(rqaf_name)); | |
2836ee4b | 296 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 297 | rq->internal_tag); |
2836ee4b BVA |
298 | if (mq_ops->show_rq) |
299 | mq_ops->show_rq(m, rq); | |
300 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
301 | return 0; |
302 | } | |
daaadb3e OS |
303 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
304 | ||
305 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
306 | { | |
307 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
308 | } | |
16b738f6 | 309 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
310 | |
311 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 312 | __acquires(&hctx->lock) |
950cd7e9 OS |
313 | { |
314 | struct blk_mq_hw_ctx *hctx = m->private; | |
315 | ||
316 | spin_lock(&hctx->lock); | |
317 | return seq_list_start(&hctx->dispatch, *pos); | |
318 | } | |
319 | ||
320 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
321 | { | |
322 | struct blk_mq_hw_ctx *hctx = m->private; | |
323 | ||
324 | return seq_list_next(v, &hctx->dispatch, pos); | |
325 | } | |
326 | ||
327 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 328 | __releases(&hctx->lock) |
950cd7e9 OS |
329 | { |
330 | struct blk_mq_hw_ctx *hctx = m->private; | |
331 | ||
332 | spin_unlock(&hctx->lock); | |
333 | } | |
334 | ||
335 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
336 | .start = hctx_dispatch_start, | |
337 | .next = hctx_dispatch_next, | |
338 | .stop = hctx_dispatch_stop, | |
339 | .show = blk_mq_debugfs_rq_show, | |
340 | }; | |
341 | ||
f57de23a | 342 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 343 | { |
f57de23a | 344 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
345 | |
346 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
347 | return 0; | |
348 | } | |
349 | ||
d96b37c0 OS |
350 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
351 | struct blk_mq_tags *tags) | |
352 | { | |
353 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
354 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
355 | seq_printf(m, "active_queues=%d\n", | |
356 | atomic_read(&tags->active_queues)); | |
357 | ||
358 | seq_puts(m, "\nbitmap_tags:\n"); | |
359 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
360 | ||
361 | if (tags->nr_reserved_tags) { | |
362 | seq_puts(m, "\nbreserved_tags:\n"); | |
363 | sbitmap_queue_show(&tags->breserved_tags, m); | |
364 | } | |
365 | } | |
366 | ||
f57de23a | 367 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 368 | { |
f57de23a | 369 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 370 | struct request_queue *q = hctx->queue; |
8c0f14ea | 371 | int res; |
d96b37c0 | 372 | |
8c0f14ea BVA |
373 | res = mutex_lock_interruptible(&q->sysfs_lock); |
374 | if (res) | |
375 | goto out; | |
d96b37c0 OS |
376 | if (hctx->tags) |
377 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
378 | mutex_unlock(&q->sysfs_lock); | |
379 | ||
8c0f14ea BVA |
380 | out: |
381 | return res; | |
d96b37c0 OS |
382 | } |
383 | ||
f57de23a | 384 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 385 | { |
f57de23a | 386 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 387 | struct request_queue *q = hctx->queue; |
8c0f14ea | 388 | int res; |
d7e3621a | 389 | |
8c0f14ea BVA |
390 | res = mutex_lock_interruptible(&q->sysfs_lock); |
391 | if (res) | |
392 | goto out; | |
d7e3621a OS |
393 | if (hctx->tags) |
394 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
395 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
396 | |
397 | out: | |
398 | return res; | |
d7e3621a OS |
399 | } |
400 | ||
f57de23a | 401 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 402 | { |
f57de23a | 403 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 404 | struct request_queue *q = hctx->queue; |
8c0f14ea | 405 | int res; |
d96b37c0 | 406 | |
8c0f14ea BVA |
407 | res = mutex_lock_interruptible(&q->sysfs_lock); |
408 | if (res) | |
409 | goto out; | |
d96b37c0 OS |
410 | if (hctx->sched_tags) |
411 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
412 | mutex_unlock(&q->sysfs_lock); | |
413 | ||
8c0f14ea BVA |
414 | out: |
415 | return res; | |
d96b37c0 OS |
416 | } |
417 | ||
f57de23a | 418 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 419 | { |
f57de23a | 420 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 421 | struct request_queue *q = hctx->queue; |
8c0f14ea | 422 | int res; |
d7e3621a | 423 | |
8c0f14ea BVA |
424 | res = mutex_lock_interruptible(&q->sysfs_lock); |
425 | if (res) | |
426 | goto out; | |
d7e3621a OS |
427 | if (hctx->sched_tags) |
428 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
429 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
430 | |
431 | out: | |
432 | return res; | |
d7e3621a OS |
433 | } |
434 | ||
f57de23a | 435 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 436 | { |
f57de23a | 437 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
438 | |
439 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
440 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
441 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
442 | return 0; | |
443 | } | |
444 | ||
f57de23a | 445 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
446 | size_t count, loff_t *ppos) |
447 | { | |
f57de23a | 448 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
449 | |
450 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
451 | return count; | |
452 | } | |
453 | ||
f57de23a | 454 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 455 | { |
f57de23a | 456 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
457 | int i; |
458 | ||
459 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
460 | ||
461 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
462 | unsigned int d = 1U << (i - 1); | |
463 | ||
464 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
465 | } | |
466 | ||
467 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
468 | return 0; | |
469 | } | |
470 | ||
f57de23a | 471 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
472 | size_t count, loff_t *ppos) |
473 | { | |
f57de23a | 474 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
475 | int i; |
476 | ||
477 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
478 | hctx->dispatched[i] = 0; | |
479 | return count; | |
480 | } | |
481 | ||
f57de23a | 482 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 483 | { |
f57de23a | 484 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
485 | |
486 | seq_printf(m, "%lu\n", hctx->queued); | |
487 | return 0; | |
488 | } | |
489 | ||
f57de23a | 490 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
491 | size_t count, loff_t *ppos) |
492 | { | |
f57de23a | 493 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
494 | |
495 | hctx->queued = 0; | |
496 | return count; | |
497 | } | |
498 | ||
f57de23a | 499 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 500 | { |
f57de23a | 501 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
502 | |
503 | seq_printf(m, "%lu\n", hctx->run); | |
504 | return 0; | |
505 | } | |
506 | ||
f57de23a OS |
507 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
508 | loff_t *ppos) | |
4a46f05e | 509 | { |
f57de23a | 510 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
511 | |
512 | hctx->run = 0; | |
513 | return count; | |
514 | } | |
515 | ||
f57de23a | 516 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 517 | { |
f57de23a | 518 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
519 | |
520 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
521 | return 0; | |
522 | } | |
523 | ||
950cd7e9 | 524 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 525 | __acquires(&ctx->lock) |
950cd7e9 OS |
526 | { |
527 | struct blk_mq_ctx *ctx = m->private; | |
528 | ||
529 | spin_lock(&ctx->lock); | |
530 | return seq_list_start(&ctx->rq_list, *pos); | |
531 | } | |
532 | ||
533 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
534 | { | |
535 | struct blk_mq_ctx *ctx = m->private; | |
536 | ||
537 | return seq_list_next(v, &ctx->rq_list, pos); | |
538 | } | |
539 | ||
540 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 541 | __releases(&ctx->lock) |
950cd7e9 OS |
542 | { |
543 | struct blk_mq_ctx *ctx = m->private; | |
544 | ||
545 | spin_unlock(&ctx->lock); | |
546 | } | |
547 | ||
548 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
549 | .start = ctx_rq_list_start, | |
550 | .next = ctx_rq_list_next, | |
551 | .stop = ctx_rq_list_stop, | |
552 | .show = blk_mq_debugfs_rq_show, | |
553 | }; | |
f57de23a | 554 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 555 | { |
f57de23a | 556 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
557 | |
558 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
559 | return 0; | |
560 | } | |
561 | ||
f57de23a | 562 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
563 | size_t count, loff_t *ppos) |
564 | { | |
f57de23a | 565 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
566 | |
567 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
568 | return count; | |
569 | } | |
570 | ||
f57de23a | 571 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 572 | { |
f57de23a | 573 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
574 | |
575 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
576 | return 0; | |
577 | } | |
578 | ||
f57de23a OS |
579 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
580 | size_t count, loff_t *ppos) | |
4a46f05e | 581 | { |
f57de23a | 582 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
583 | |
584 | ctx->rq_merged = 0; | |
585 | return count; | |
586 | } | |
587 | ||
f57de23a | 588 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 589 | { |
f57de23a | 590 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
591 | |
592 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
593 | return 0; | |
594 | } | |
595 | ||
f57de23a OS |
596 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
597 | size_t count, loff_t *ppos) | |
4a46f05e | 598 | { |
f57de23a OS |
599 | struct blk_mq_ctx *ctx = data; |
600 | ||
601 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
602 | return count; | |
4a46f05e OS |
603 | } |
604 | ||
f57de23a OS |
605 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
606 | { | |
607 | const struct blk_mq_debugfs_attr *attr = m->private; | |
608 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
609 | ||
610 | return attr->show(data, m); | |
611 | } | |
612 | ||
613 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
614 | size_t count, loff_t *ppos) | |
4a46f05e OS |
615 | { |
616 | struct seq_file *m = file->private_data; | |
f57de23a OS |
617 | const struct blk_mq_debugfs_attr *attr = m->private; |
618 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 619 | |
f57de23a OS |
620 | if (!attr->write) |
621 | return -EPERM; | |
622 | ||
623 | return attr->write(data, buf, count, ppos); | |
624 | } | |
625 | ||
626 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
627 | { | |
628 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
629 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
630 | struct seq_file *m; | |
631 | int ret; | |
632 | ||
633 | if (attr->seq_ops) { | |
634 | ret = seq_open(file, attr->seq_ops); | |
635 | if (!ret) { | |
636 | m = file->private_data; | |
637 | m->private = data; | |
638 | } | |
639 | return ret; | |
640 | } | |
641 | ||
642 | if (WARN_ON_ONCE(!attr->show)) | |
643 | return -EPERM; | |
644 | ||
645 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
646 | } |
647 | ||
f57de23a OS |
648 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
649 | { | |
650 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
651 | ||
652 | if (attr->show) | |
653 | return single_release(inode, file); | |
654 | else | |
655 | return seq_release(inode, file); | |
656 | } | |
657 | ||
658 | const struct file_operations blk_mq_debugfs_fops = { | |
659 | .open = blk_mq_debugfs_open, | |
4a46f05e | 660 | .read = seq_read, |
f57de23a | 661 | .write = blk_mq_debugfs_write, |
4a46f05e | 662 | .llseek = seq_lseek, |
f57de23a | 663 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
664 | }; |
665 | ||
34dbad5d | 666 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
f57de23a OS |
667 | {"poll_stat", 0400, queue_poll_stat_show}, |
668 | {"state", 0600, queue_state_show, queue_state_write}, | |
34dbad5d OS |
669 | {}, |
670 | }; | |
671 | ||
07e4fead | 672 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
673 | {"state", 0400, hctx_state_show}, |
674 | {"flags", 0400, hctx_flags_show}, | |
675 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
676 | {"ctx_map", 0400, hctx_ctx_map_show}, | |
677 | {"tags", 0400, hctx_tags_show}, | |
678 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
679 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
680 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
681 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
682 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
683 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
684 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
685 | {"active", 0400, hctx_active_show}, | |
72f2f8f6 | 686 | {}, |
07e4fead OS |
687 | }; |
688 | ||
689 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
690 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
691 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
692 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
693 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 694 | {}, |
07e4fead OS |
695 | }; |
696 | ||
9c1051aa OS |
697 | static bool debugfs_create_files(struct dentry *parent, void *data, |
698 | const struct blk_mq_debugfs_attr *attr) | |
699 | { | |
700 | d_inode(parent)->i_private = data; | |
701 | ||
702 | for (; attr->name; attr++) { | |
703 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
704 | (void *)attr, &blk_mq_debugfs_fops)) | |
705 | return false; | |
706 | } | |
707 | return true; | |
708 | } | |
709 | ||
4c9e4019 | 710 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 711 | { |
9c1051aa OS |
712 | struct blk_mq_hw_ctx *hctx; |
713 | int i; | |
714 | ||
18fbda91 | 715 | if (!blk_debugfs_root) |
07e4fead OS |
716 | return -ENOENT; |
717 | ||
4c9e4019 BVA |
718 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
719 | blk_debugfs_root); | |
07e4fead | 720 | if (!q->debugfs_dir) |
9c1051aa | 721 | return -ENOMEM; |
07e4fead | 722 | |
9c1051aa OS |
723 | if (!debugfs_create_files(q->debugfs_dir, q, |
724 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
725 | goto err; |
726 | ||
9c1051aa OS |
727 | /* |
728 | * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir | |
729 | * didn't exist yet (because we don't know what to name the directory | |
730 | * until the queue is registered to a gendisk). | |
731 | */ | |
732 | queue_for_each_hw_ctx(q, hctx, i) { | |
733 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
734 | goto err; | |
d332ce09 OS |
735 | if (q->elevator && !hctx->sched_debugfs_dir && |
736 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
737 | goto err; | |
9c1051aa OS |
738 | } |
739 | ||
07e4fead OS |
740 | return 0; |
741 | ||
742 | err: | |
743 | blk_mq_debugfs_unregister(q); | |
744 | return -ENOMEM; | |
745 | } | |
746 | ||
747 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
748 | { | |
749 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 750 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
751 | q->debugfs_dir = NULL; |
752 | } | |
753 | ||
9c1051aa OS |
754 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
755 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
756 | { |
757 | struct dentry *ctx_dir; | |
758 | char name[20]; | |
07e4fead OS |
759 | |
760 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 761 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
762 | if (!ctx_dir) |
763 | return -ENOMEM; | |
764 | ||
72f2f8f6 BVA |
765 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
766 | return -ENOMEM; | |
07e4fead OS |
767 | |
768 | return 0; | |
769 | } | |
770 | ||
9c1051aa OS |
771 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
772 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
773 | { |
774 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
775 | char name[20]; |
776 | int i; | |
777 | ||
9c1051aa OS |
778 | if (!q->debugfs_dir) |
779 | return -ENOENT; | |
780 | ||
88aabbd7 | 781 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
782 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
783 | if (!hctx->debugfs_dir) | |
07e4fead OS |
784 | return -ENOMEM; |
785 | ||
9c1051aa OS |
786 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
787 | blk_mq_debugfs_hctx_attrs)) | |
788 | goto err; | |
07e4fead OS |
789 | |
790 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
791 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
792 | goto err; | |
07e4fead OS |
793 | } |
794 | ||
795 | return 0; | |
9c1051aa OS |
796 | |
797 | err: | |
798 | blk_mq_debugfs_unregister_hctx(hctx); | |
799 | return -ENOMEM; | |
800 | } | |
801 | ||
802 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
803 | { | |
804 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 805 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 806 | hctx->debugfs_dir = NULL; |
07e4fead OS |
807 | } |
808 | ||
9c1051aa | 809 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
810 | { |
811 | struct blk_mq_hw_ctx *hctx; | |
812 | int i; | |
813 | ||
07e4fead OS |
814 | queue_for_each_hw_ctx(q, hctx, i) { |
815 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 816 | return -ENOMEM; |
07e4fead OS |
817 | } |
818 | ||
819 | return 0; | |
07e4fead OS |
820 | } |
821 | ||
9c1051aa | 822 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 823 | { |
9c1051aa OS |
824 | struct blk_mq_hw_ctx *hctx; |
825 | int i; | |
826 | ||
827 | queue_for_each_hw_ctx(q, hctx, i) | |
828 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 829 | } |
d332ce09 OS |
830 | |
831 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
832 | { | |
833 | struct elevator_type *e = q->elevator->type; | |
834 | ||
835 | if (!q->debugfs_dir) | |
836 | return -ENOENT; | |
837 | ||
838 | if (!e->queue_debugfs_attrs) | |
839 | return 0; | |
840 | ||
841 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
842 | if (!q->sched_debugfs_dir) | |
843 | return -ENOMEM; | |
844 | ||
845 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
846 | e->queue_debugfs_attrs)) | |
847 | goto err; | |
848 | ||
849 | return 0; | |
850 | ||
851 | err: | |
852 | blk_mq_debugfs_unregister_sched(q); | |
853 | return -ENOMEM; | |
854 | } | |
855 | ||
856 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
857 | { | |
858 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
859 | q->sched_debugfs_dir = NULL; | |
860 | } | |
861 | ||
862 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, | |
863 | struct blk_mq_hw_ctx *hctx) | |
864 | { | |
865 | struct elevator_type *e = q->elevator->type; | |
866 | ||
867 | if (!hctx->debugfs_dir) | |
868 | return -ENOENT; | |
869 | ||
870 | if (!e->hctx_debugfs_attrs) | |
871 | return 0; | |
872 | ||
873 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
874 | hctx->debugfs_dir); | |
875 | if (!hctx->sched_debugfs_dir) | |
876 | return -ENOMEM; | |
877 | ||
878 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
879 | e->hctx_debugfs_attrs)) | |
880 | return -ENOMEM; | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
886 | { | |
887 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
888 | hctx->sched_debugfs_dir = NULL; | |
889 | } |