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 OS |
26 | |
27 | struct blk_mq_debugfs_attr { | |
28 | const char *name; | |
29 | umode_t mode; | |
f57de23a OS |
30 | int (*show)(void *, struct seq_file *); |
31 | ssize_t (*write)(void *, const char __user *, size_t, loff_t *); | |
32 | /* Set either .show or .seq_ops. */ | |
33 | const struct seq_operations *seq_ops; | |
07e4fead OS |
34 | }; |
35 | ||
91d68905 BVA |
36 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
37 | const char *const *flag_name, int flag_name_count) | |
38 | { | |
39 | bool sep = false; | |
40 | int i; | |
41 | ||
42 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
43 | if (!(flags & BIT(i))) | |
44 | continue; | |
45 | if (sep) | |
bec03d6b | 46 | seq_puts(m, "|"); |
91d68905 BVA |
47 | sep = true; |
48 | if (i < flag_name_count && flag_name[i]) | |
49 | seq_puts(m, flag_name[i]); | |
50 | else | |
51 | seq_printf(m, "%d", i); | |
52 | } | |
91d68905 BVA |
53 | return 0; |
54 | } | |
55 | ||
1a435111 | 56 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 57 | static const char *const blk_queue_flag_name[] = { |
1a435111 OS |
58 | QUEUE_FLAG_NAME(QUEUED), |
59 | QUEUE_FLAG_NAME(STOPPED), | |
60 | QUEUE_FLAG_NAME(SYNCFULL), | |
61 | QUEUE_FLAG_NAME(ASYNCFULL), | |
62 | QUEUE_FLAG_NAME(DYING), | |
63 | QUEUE_FLAG_NAME(BYPASS), | |
64 | QUEUE_FLAG_NAME(BIDI), | |
65 | QUEUE_FLAG_NAME(NOMERGES), | |
66 | QUEUE_FLAG_NAME(SAME_COMP), | |
67 | QUEUE_FLAG_NAME(FAIL_IO), | |
68 | QUEUE_FLAG_NAME(STACKABLE), | |
69 | QUEUE_FLAG_NAME(NONROT), | |
70 | QUEUE_FLAG_NAME(IO_STAT), | |
71 | QUEUE_FLAG_NAME(DISCARD), | |
72 | QUEUE_FLAG_NAME(NOXMERGES), | |
73 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
74 | QUEUE_FLAG_NAME(SECERASE), | |
75 | QUEUE_FLAG_NAME(SAME_FORCE), | |
76 | QUEUE_FLAG_NAME(DEAD), | |
77 | QUEUE_FLAG_NAME(INIT_DONE), | |
78 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
79 | QUEUE_FLAG_NAME(POLL), | |
80 | QUEUE_FLAG_NAME(WC), | |
81 | QUEUE_FLAG_NAME(FUA), | |
82 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
83 | QUEUE_FLAG_NAME(DAX), | |
84 | QUEUE_FLAG_NAME(STATS), | |
85 | QUEUE_FLAG_NAME(POLL_STATS), | |
86 | QUEUE_FLAG_NAME(REGISTERED), | |
91d68905 | 87 | }; |
1a435111 | 88 | #undef QUEUE_FLAG_NAME |
91d68905 | 89 | |
f57de23a | 90 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 91 | { |
f57de23a | 92 | struct request_queue *q = data; |
91d68905 BVA |
93 | |
94 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
95 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 96 | seq_puts(m, "\n"); |
91d68905 BVA |
97 | return 0; |
98 | } | |
99 | ||
f57de23a OS |
100 | static ssize_t queue_state_write(void *data, const char __user *buf, |
101 | size_t count, loff_t *ppos) | |
91d68905 | 102 | { |
f57de23a | 103 | struct request_queue *q = data; |
71b90511 | 104 | char opbuf[16] = { }, *op; |
91d68905 | 105 | |
18d4d7d0 BVA |
106 | /* |
107 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
108 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
109 | * triggering a use-after-free. | |
110 | */ | |
111 | if (blk_queue_dead(q)) | |
112 | return -ENOENT; | |
113 | ||
71b90511 | 114 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
115 | pr_err("%s: operation too long\n", __func__); |
116 | goto inval; | |
117 | } | |
118 | ||
71b90511 | 119 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 120 | return -EFAULT; |
71b90511 | 121 | op = strstrip(opbuf); |
91d68905 BVA |
122 | if (strcmp(op, "run") == 0) { |
123 | blk_mq_run_hw_queues(q, true); | |
124 | } else if (strcmp(op, "start") == 0) { | |
125 | blk_mq_start_stopped_hw_queues(q, true); | |
126 | } else { | |
c7e4145a OS |
127 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
128 | inval: | |
129 | pr_err("%s: use either 'run' or 'start'\n", __func__); | |
91d68905 BVA |
130 | return -EINVAL; |
131 | } | |
c7e4145a | 132 | return count; |
91d68905 BVA |
133 | } |
134 | ||
34dbad5d OS |
135 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
136 | { | |
137 | if (stat->nr_samples) { | |
138 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
139 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
140 | } else { | |
141 | seq_puts(m, "samples=0"); | |
142 | } | |
143 | } | |
144 | ||
f57de23a | 145 | static int queue_poll_stat_show(void *data, struct seq_file *m) |
34dbad5d | 146 | { |
f57de23a | 147 | struct request_queue *q = data; |
0206319f | 148 | int bucket; |
34dbad5d | 149 | |
0206319f SB |
150 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
151 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
152 | print_stat(m, &q->poll_stat[2*bucket]); | |
153 | seq_puts(m, "\n"); | |
34dbad5d | 154 | |
0206319f SB |
155 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
156 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
157 | seq_puts(m, "\n"); | |
158 | } | |
34dbad5d OS |
159 | return 0; |
160 | } | |
161 | ||
1a435111 | 162 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 163 | static const char *const hctx_state_name[] = { |
1a435111 OS |
164 | HCTX_STATE_NAME(STOPPED), |
165 | HCTX_STATE_NAME(TAG_ACTIVE), | |
166 | HCTX_STATE_NAME(SCHED_RESTART), | |
167 | HCTX_STATE_NAME(TAG_WAITING), | |
168 | HCTX_STATE_NAME(START_ON_RUN), | |
f5c0b091 | 169 | }; |
1a435111 OS |
170 | #undef HCTX_STATE_NAME |
171 | ||
f57de23a | 172 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 173 | { |
f57de23a | 174 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 175 | |
f5c0b091 BVA |
176 | blk_flags_show(m, hctx->state, hctx_state_name, |
177 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 178 | seq_puts(m, "\n"); |
9abb2ad2 OS |
179 | return 0; |
180 | } | |
181 | ||
1a435111 | 182 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 183 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
184 | BLK_TAG_ALLOC_NAME(FIFO), |
185 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 186 | }; |
1a435111 | 187 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 188 | |
1a435111 | 189 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 190 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
191 | HCTX_FLAG_NAME(SHOULD_MERGE), |
192 | HCTX_FLAG_NAME(TAG_SHARED), | |
193 | HCTX_FLAG_NAME(SG_MERGE), | |
194 | HCTX_FLAG_NAME(BLOCKING), | |
195 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 196 | }; |
1a435111 | 197 | #undef HCTX_FLAG_NAME |
f5c0b091 | 198 | |
f57de23a | 199 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 200 | { |
f57de23a | 201 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 202 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 203 | |
f5c0b091 BVA |
204 | seq_puts(m, "alloc_policy="); |
205 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
206 | alloc_policy_name[alloc_policy]) | |
207 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
208 | else | |
209 | seq_printf(m, "%d", alloc_policy); | |
210 | seq_puts(m, " "); | |
211 | blk_flags_show(m, | |
212 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
213 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 214 | seq_puts(m, "\n"); |
9abb2ad2 OS |
215 | return 0; |
216 | } | |
217 | ||
1a435111 | 218 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 219 | static const char *const op_name[] = { |
1a435111 OS |
220 | REQ_OP_NAME(READ), |
221 | REQ_OP_NAME(WRITE), | |
222 | REQ_OP_NAME(FLUSH), | |
223 | REQ_OP_NAME(DISCARD), | |
224 | REQ_OP_NAME(ZONE_REPORT), | |
225 | REQ_OP_NAME(SECURE_ERASE), | |
226 | REQ_OP_NAME(ZONE_RESET), | |
227 | REQ_OP_NAME(WRITE_SAME), | |
228 | REQ_OP_NAME(WRITE_ZEROES), | |
229 | REQ_OP_NAME(SCSI_IN), | |
230 | REQ_OP_NAME(SCSI_OUT), | |
231 | REQ_OP_NAME(DRV_IN), | |
232 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 233 | }; |
1a435111 | 234 | #undef REQ_OP_NAME |
8658dca8 | 235 | |
1a435111 | 236 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 237 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
238 | CMD_FLAG_NAME(FAILFAST_DEV), |
239 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
240 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
241 | CMD_FLAG_NAME(SYNC), | |
242 | CMD_FLAG_NAME(META), | |
243 | CMD_FLAG_NAME(PRIO), | |
244 | CMD_FLAG_NAME(NOMERGE), | |
245 | CMD_FLAG_NAME(IDLE), | |
246 | CMD_FLAG_NAME(INTEGRITY), | |
247 | CMD_FLAG_NAME(FUA), | |
248 | CMD_FLAG_NAME(PREFLUSH), | |
249 | CMD_FLAG_NAME(RAHEAD), | |
250 | CMD_FLAG_NAME(BACKGROUND), | |
251 | CMD_FLAG_NAME(NOUNMAP), | |
8658dca8 | 252 | }; |
1a435111 | 253 | #undef CMD_FLAG_NAME |
8658dca8 | 254 | |
1a435111 | 255 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 256 | static const char *const rqf_name[] = { |
1a435111 OS |
257 | RQF_NAME(SORTED), |
258 | RQF_NAME(STARTED), | |
259 | RQF_NAME(QUEUED), | |
260 | RQF_NAME(SOFTBARRIER), | |
261 | RQF_NAME(FLUSH_SEQ), | |
262 | RQF_NAME(MIXED_MERGE), | |
263 | RQF_NAME(MQ_INFLIGHT), | |
264 | RQF_NAME(DONTPREP), | |
265 | RQF_NAME(PREEMPT), | |
266 | RQF_NAME(COPY_USER), | |
267 | RQF_NAME(FAILED), | |
268 | RQF_NAME(QUIET), | |
269 | RQF_NAME(ELVPRIV), | |
270 | RQF_NAME(IO_STAT), | |
271 | RQF_NAME(ALLOCED), | |
272 | RQF_NAME(PM), | |
273 | RQF_NAME(HASHED), | |
274 | RQF_NAME(STATS), | |
275 | RQF_NAME(SPECIAL_PAYLOAD), | |
8658dca8 | 276 | }; |
1a435111 | 277 | #undef RQF_NAME |
8658dca8 | 278 | |
950cd7e9 OS |
279 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
280 | { | |
281 | struct request *rq = list_entry_rq(v); | |
2836ee4b | 282 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 283 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 284 | |
8658dca8 BVA |
285 | seq_printf(m, "%p {.op=", rq); |
286 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
287 | seq_printf(m, "%s", op_name[op]); | |
288 | else | |
289 | seq_printf(m, "%d", op); | |
290 | seq_puts(m, ", .cmd_flags="); | |
291 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
292 | ARRAY_SIZE(cmd_flag_name)); | |
293 | seq_puts(m, ", .rq_flags="); | |
294 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
295 | ARRAY_SIZE(rqf_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 | } | |
303 | ||
304 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 305 | __acquires(&hctx->lock) |
950cd7e9 OS |
306 | { |
307 | struct blk_mq_hw_ctx *hctx = m->private; | |
308 | ||
309 | spin_lock(&hctx->lock); | |
310 | return seq_list_start(&hctx->dispatch, *pos); | |
311 | } | |
312 | ||
313 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
314 | { | |
315 | struct blk_mq_hw_ctx *hctx = m->private; | |
316 | ||
317 | return seq_list_next(v, &hctx->dispatch, pos); | |
318 | } | |
319 | ||
320 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 321 | __releases(&hctx->lock) |
950cd7e9 OS |
322 | { |
323 | struct blk_mq_hw_ctx *hctx = m->private; | |
324 | ||
325 | spin_unlock(&hctx->lock); | |
326 | } | |
327 | ||
328 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
329 | .start = hctx_dispatch_start, | |
330 | .next = hctx_dispatch_next, | |
331 | .stop = hctx_dispatch_stop, | |
332 | .show = blk_mq_debugfs_rq_show, | |
333 | }; | |
334 | ||
f57de23a | 335 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 336 | { |
f57de23a | 337 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
338 | |
339 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
340 | return 0; | |
341 | } | |
342 | ||
d96b37c0 OS |
343 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
344 | struct blk_mq_tags *tags) | |
345 | { | |
346 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
347 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
348 | seq_printf(m, "active_queues=%d\n", | |
349 | atomic_read(&tags->active_queues)); | |
350 | ||
351 | seq_puts(m, "\nbitmap_tags:\n"); | |
352 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
353 | ||
354 | if (tags->nr_reserved_tags) { | |
355 | seq_puts(m, "\nbreserved_tags:\n"); | |
356 | sbitmap_queue_show(&tags->breserved_tags, m); | |
357 | } | |
358 | } | |
359 | ||
f57de23a | 360 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 361 | { |
f57de23a | 362 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 363 | struct request_queue *q = hctx->queue; |
8c0f14ea | 364 | int res; |
d96b37c0 | 365 | |
8c0f14ea BVA |
366 | res = mutex_lock_interruptible(&q->sysfs_lock); |
367 | if (res) | |
368 | goto out; | |
d96b37c0 OS |
369 | if (hctx->tags) |
370 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
371 | mutex_unlock(&q->sysfs_lock); | |
372 | ||
8c0f14ea BVA |
373 | out: |
374 | return res; | |
d96b37c0 OS |
375 | } |
376 | ||
f57de23a | 377 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 378 | { |
f57de23a | 379 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 380 | struct request_queue *q = hctx->queue; |
8c0f14ea | 381 | int res; |
d7e3621a | 382 | |
8c0f14ea BVA |
383 | res = mutex_lock_interruptible(&q->sysfs_lock); |
384 | if (res) | |
385 | goto out; | |
d7e3621a OS |
386 | if (hctx->tags) |
387 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
388 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
389 | |
390 | out: | |
391 | return res; | |
d7e3621a OS |
392 | } |
393 | ||
f57de23a | 394 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 395 | { |
f57de23a | 396 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 397 | struct request_queue *q = hctx->queue; |
8c0f14ea | 398 | int res; |
d96b37c0 | 399 | |
8c0f14ea BVA |
400 | res = mutex_lock_interruptible(&q->sysfs_lock); |
401 | if (res) | |
402 | goto out; | |
d96b37c0 OS |
403 | if (hctx->sched_tags) |
404 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
405 | mutex_unlock(&q->sysfs_lock); | |
406 | ||
8c0f14ea BVA |
407 | out: |
408 | return res; | |
d96b37c0 OS |
409 | } |
410 | ||
f57de23a | 411 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 412 | { |
f57de23a | 413 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 414 | struct request_queue *q = hctx->queue; |
8c0f14ea | 415 | int res; |
d7e3621a | 416 | |
8c0f14ea BVA |
417 | res = mutex_lock_interruptible(&q->sysfs_lock); |
418 | if (res) | |
419 | goto out; | |
d7e3621a OS |
420 | if (hctx->sched_tags) |
421 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
422 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
423 | |
424 | out: | |
425 | return res; | |
d7e3621a OS |
426 | } |
427 | ||
f57de23a | 428 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 429 | { |
f57de23a | 430 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
431 | |
432 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
433 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
434 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
435 | return 0; | |
436 | } | |
437 | ||
f57de23a | 438 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
439 | size_t count, loff_t *ppos) |
440 | { | |
f57de23a | 441 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
442 | |
443 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
444 | return count; | |
445 | } | |
446 | ||
f57de23a | 447 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 448 | { |
f57de23a | 449 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
450 | int i; |
451 | ||
452 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
453 | ||
454 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
455 | unsigned int d = 1U << (i - 1); | |
456 | ||
457 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
458 | } | |
459 | ||
460 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
461 | return 0; | |
462 | } | |
463 | ||
f57de23a | 464 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
465 | size_t count, loff_t *ppos) |
466 | { | |
f57de23a | 467 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
468 | int i; |
469 | ||
470 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
471 | hctx->dispatched[i] = 0; | |
472 | return count; | |
473 | } | |
474 | ||
f57de23a | 475 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 476 | { |
f57de23a | 477 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
478 | |
479 | seq_printf(m, "%lu\n", hctx->queued); | |
480 | return 0; | |
481 | } | |
482 | ||
f57de23a | 483 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
484 | size_t count, loff_t *ppos) |
485 | { | |
f57de23a | 486 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
487 | |
488 | hctx->queued = 0; | |
489 | return count; | |
490 | } | |
491 | ||
f57de23a | 492 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 493 | { |
f57de23a | 494 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
495 | |
496 | seq_printf(m, "%lu\n", hctx->run); | |
497 | return 0; | |
498 | } | |
499 | ||
f57de23a OS |
500 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
501 | loff_t *ppos) | |
4a46f05e | 502 | { |
f57de23a | 503 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
504 | |
505 | hctx->run = 0; | |
506 | return count; | |
507 | } | |
508 | ||
f57de23a | 509 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 510 | { |
f57de23a | 511 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
512 | |
513 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
514 | return 0; | |
515 | } | |
516 | ||
950cd7e9 | 517 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 518 | __acquires(&ctx->lock) |
950cd7e9 OS |
519 | { |
520 | struct blk_mq_ctx *ctx = m->private; | |
521 | ||
522 | spin_lock(&ctx->lock); | |
523 | return seq_list_start(&ctx->rq_list, *pos); | |
524 | } | |
525 | ||
526 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
527 | { | |
528 | struct blk_mq_ctx *ctx = m->private; | |
529 | ||
530 | return seq_list_next(v, &ctx->rq_list, pos); | |
531 | } | |
532 | ||
533 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 534 | __releases(&ctx->lock) |
950cd7e9 OS |
535 | { |
536 | struct blk_mq_ctx *ctx = m->private; | |
537 | ||
538 | spin_unlock(&ctx->lock); | |
539 | } | |
540 | ||
541 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
542 | .start = ctx_rq_list_start, | |
543 | .next = ctx_rq_list_next, | |
544 | .stop = ctx_rq_list_stop, | |
545 | .show = blk_mq_debugfs_rq_show, | |
546 | }; | |
f57de23a | 547 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 548 | { |
f57de23a | 549 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
550 | |
551 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
552 | return 0; | |
553 | } | |
554 | ||
f57de23a | 555 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
556 | size_t count, loff_t *ppos) |
557 | { | |
f57de23a | 558 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
559 | |
560 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
561 | return count; | |
562 | } | |
563 | ||
f57de23a | 564 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 565 | { |
f57de23a | 566 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
567 | |
568 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
569 | return 0; | |
570 | } | |
571 | ||
f57de23a OS |
572 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
573 | size_t count, loff_t *ppos) | |
4a46f05e | 574 | { |
f57de23a | 575 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
576 | |
577 | ctx->rq_merged = 0; | |
578 | return count; | |
579 | } | |
580 | ||
f57de23a | 581 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 582 | { |
f57de23a | 583 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
584 | |
585 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
586 | return 0; | |
587 | } | |
588 | ||
f57de23a OS |
589 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
590 | size_t count, loff_t *ppos) | |
4a46f05e | 591 | { |
f57de23a OS |
592 | struct blk_mq_ctx *ctx = data; |
593 | ||
594 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
595 | return count; | |
4a46f05e OS |
596 | } |
597 | ||
f57de23a OS |
598 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
599 | { | |
600 | const struct blk_mq_debugfs_attr *attr = m->private; | |
601 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
602 | ||
603 | return attr->show(data, m); | |
604 | } | |
605 | ||
606 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
607 | size_t count, loff_t *ppos) | |
4a46f05e OS |
608 | { |
609 | struct seq_file *m = file->private_data; | |
f57de23a OS |
610 | const struct blk_mq_debugfs_attr *attr = m->private; |
611 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 612 | |
f57de23a OS |
613 | if (!attr->write) |
614 | return -EPERM; | |
615 | ||
616 | return attr->write(data, buf, count, ppos); | |
617 | } | |
618 | ||
619 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
620 | { | |
621 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
622 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
623 | struct seq_file *m; | |
624 | int ret; | |
625 | ||
626 | if (attr->seq_ops) { | |
627 | ret = seq_open(file, attr->seq_ops); | |
628 | if (!ret) { | |
629 | m = file->private_data; | |
630 | m->private = data; | |
631 | } | |
632 | return ret; | |
633 | } | |
634 | ||
635 | if (WARN_ON_ONCE(!attr->show)) | |
636 | return -EPERM; | |
637 | ||
638 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
639 | } |
640 | ||
f57de23a OS |
641 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
642 | { | |
643 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
644 | ||
645 | if (attr->show) | |
646 | return single_release(inode, file); | |
647 | else | |
648 | return seq_release(inode, file); | |
649 | } | |
650 | ||
651 | const struct file_operations blk_mq_debugfs_fops = { | |
652 | .open = blk_mq_debugfs_open, | |
4a46f05e | 653 | .read = seq_read, |
f57de23a | 654 | .write = blk_mq_debugfs_write, |
4a46f05e | 655 | .llseek = seq_lseek, |
f57de23a | 656 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
657 | }; |
658 | ||
34dbad5d | 659 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
f57de23a OS |
660 | {"poll_stat", 0400, queue_poll_stat_show}, |
661 | {"state", 0600, queue_state_show, queue_state_write}, | |
34dbad5d OS |
662 | {}, |
663 | }; | |
664 | ||
07e4fead | 665 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
666 | {"state", 0400, hctx_state_show}, |
667 | {"flags", 0400, hctx_flags_show}, | |
668 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
669 | {"ctx_map", 0400, hctx_ctx_map_show}, | |
670 | {"tags", 0400, hctx_tags_show}, | |
671 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
672 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
673 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
674 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
675 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
676 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
677 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
678 | {"active", 0400, hctx_active_show}, | |
72f2f8f6 | 679 | {}, |
07e4fead OS |
680 | }; |
681 | ||
682 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
683 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
684 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
685 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
686 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 687 | {}, |
07e4fead OS |
688 | }; |
689 | ||
9c1051aa OS |
690 | static bool debugfs_create_files(struct dentry *parent, void *data, |
691 | const struct blk_mq_debugfs_attr *attr) | |
692 | { | |
693 | d_inode(parent)->i_private = data; | |
694 | ||
695 | for (; attr->name; attr++) { | |
696 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
697 | (void *)attr, &blk_mq_debugfs_fops)) | |
698 | return false; | |
699 | } | |
700 | return true; | |
701 | } | |
702 | ||
4c9e4019 | 703 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 704 | { |
9c1051aa OS |
705 | struct blk_mq_hw_ctx *hctx; |
706 | int i; | |
707 | ||
18fbda91 | 708 | if (!blk_debugfs_root) |
07e4fead OS |
709 | return -ENOENT; |
710 | ||
4c9e4019 BVA |
711 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
712 | blk_debugfs_root); | |
07e4fead | 713 | if (!q->debugfs_dir) |
9c1051aa | 714 | return -ENOMEM; |
07e4fead | 715 | |
9c1051aa OS |
716 | if (!debugfs_create_files(q->debugfs_dir, q, |
717 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
718 | goto err; |
719 | ||
9c1051aa OS |
720 | /* |
721 | * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir | |
722 | * didn't exist yet (because we don't know what to name the directory | |
723 | * until the queue is registered to a gendisk). | |
724 | */ | |
725 | queue_for_each_hw_ctx(q, hctx, i) { | |
726 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
727 | goto err; | |
728 | } | |
729 | ||
07e4fead OS |
730 | return 0; |
731 | ||
732 | err: | |
733 | blk_mq_debugfs_unregister(q); | |
734 | return -ENOMEM; | |
735 | } | |
736 | ||
737 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
738 | { | |
739 | debugfs_remove_recursive(q->debugfs_dir); | |
07e4fead OS |
740 | q->debugfs_dir = NULL; |
741 | } | |
742 | ||
9c1051aa OS |
743 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
744 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
745 | { |
746 | struct dentry *ctx_dir; | |
747 | char name[20]; | |
07e4fead OS |
748 | |
749 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 750 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
751 | if (!ctx_dir) |
752 | return -ENOMEM; | |
753 | ||
72f2f8f6 BVA |
754 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
755 | return -ENOMEM; | |
07e4fead OS |
756 | |
757 | return 0; | |
758 | } | |
759 | ||
9c1051aa OS |
760 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
761 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
762 | { |
763 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
764 | char name[20]; |
765 | int i; | |
766 | ||
9c1051aa OS |
767 | if (!q->debugfs_dir) |
768 | return -ENOENT; | |
769 | ||
88aabbd7 | 770 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
771 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
772 | if (!hctx->debugfs_dir) | |
07e4fead OS |
773 | return -ENOMEM; |
774 | ||
9c1051aa OS |
775 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
776 | blk_mq_debugfs_hctx_attrs)) | |
777 | goto err; | |
07e4fead OS |
778 | |
779 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
780 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
781 | goto err; | |
07e4fead OS |
782 | } |
783 | ||
784 | return 0; | |
9c1051aa OS |
785 | |
786 | err: | |
787 | blk_mq_debugfs_unregister_hctx(hctx); | |
788 | return -ENOMEM; | |
789 | } | |
790 | ||
791 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
792 | { | |
793 | debugfs_remove_recursive(hctx->debugfs_dir); | |
794 | hctx->debugfs_dir = NULL; | |
07e4fead OS |
795 | } |
796 | ||
9c1051aa | 797 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
798 | { |
799 | struct blk_mq_hw_ctx *hctx; | |
800 | int i; | |
801 | ||
07e4fead OS |
802 | queue_for_each_hw_ctx(q, hctx, i) { |
803 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 804 | return -ENOMEM; |
07e4fead OS |
805 | } |
806 | ||
807 | return 0; | |
07e4fead OS |
808 | } |
809 | ||
9c1051aa | 810 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 811 | { |
9c1051aa OS |
812 | struct blk_mq_hw_ctx *hctx; |
813 | int i; | |
814 | ||
815 | queue_for_each_hw_ctx(q, hctx, i) | |
816 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 817 | } |