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" |
d96b37c0 | 24 | #include "blk-mq-tag.h" |
07e4fead OS |
25 | |
26 | struct blk_mq_debugfs_attr { | |
27 | const char *name; | |
28 | umode_t mode; | |
29 | const struct file_operations *fops; | |
30 | }; | |
31 | ||
950cd7e9 OS |
32 | static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file, |
33 | const struct seq_operations *ops) | |
34 | { | |
35 | struct seq_file *m; | |
36 | int ret; | |
37 | ||
38 | ret = seq_open(file, ops); | |
39 | if (!ret) { | |
40 | m = file->private_data; | |
41 | m->private = inode->i_private; | |
42 | } | |
43 | return ret; | |
44 | } | |
45 | ||
91d68905 BVA |
46 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
47 | const char *const *flag_name, int flag_name_count) | |
48 | { | |
49 | bool sep = false; | |
50 | int i; | |
51 | ||
52 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
53 | if (!(flags & BIT(i))) | |
54 | continue; | |
55 | if (sep) | |
bec03d6b | 56 | seq_puts(m, "|"); |
91d68905 BVA |
57 | sep = true; |
58 | if (i < flag_name_count && flag_name[i]) | |
59 | seq_puts(m, flag_name[i]); | |
60 | else | |
61 | seq_printf(m, "%d", i); | |
62 | } | |
91d68905 BVA |
63 | return 0; |
64 | } | |
65 | ||
1a435111 | 66 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 67 | static const char *const blk_queue_flag_name[] = { |
1a435111 OS |
68 | QUEUE_FLAG_NAME(QUEUED), |
69 | QUEUE_FLAG_NAME(STOPPED), | |
70 | QUEUE_FLAG_NAME(SYNCFULL), | |
71 | QUEUE_FLAG_NAME(ASYNCFULL), | |
72 | QUEUE_FLAG_NAME(DYING), | |
73 | QUEUE_FLAG_NAME(BYPASS), | |
74 | QUEUE_FLAG_NAME(BIDI), | |
75 | QUEUE_FLAG_NAME(NOMERGES), | |
76 | QUEUE_FLAG_NAME(SAME_COMP), | |
77 | QUEUE_FLAG_NAME(FAIL_IO), | |
78 | QUEUE_FLAG_NAME(STACKABLE), | |
79 | QUEUE_FLAG_NAME(NONROT), | |
80 | QUEUE_FLAG_NAME(IO_STAT), | |
81 | QUEUE_FLAG_NAME(DISCARD), | |
82 | QUEUE_FLAG_NAME(NOXMERGES), | |
83 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
84 | QUEUE_FLAG_NAME(SECERASE), | |
85 | QUEUE_FLAG_NAME(SAME_FORCE), | |
86 | QUEUE_FLAG_NAME(DEAD), | |
87 | QUEUE_FLAG_NAME(INIT_DONE), | |
88 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
89 | QUEUE_FLAG_NAME(POLL), | |
90 | QUEUE_FLAG_NAME(WC), | |
91 | QUEUE_FLAG_NAME(FUA), | |
92 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
93 | QUEUE_FLAG_NAME(DAX), | |
94 | QUEUE_FLAG_NAME(STATS), | |
95 | QUEUE_FLAG_NAME(POLL_STATS), | |
96 | QUEUE_FLAG_NAME(REGISTERED), | |
91d68905 | 97 | }; |
1a435111 | 98 | #undef QUEUE_FLAG_NAME |
91d68905 BVA |
99 | |
100 | static int blk_queue_flags_show(struct seq_file *m, void *v) | |
101 | { | |
102 | struct request_queue *q = m->private; | |
103 | ||
104 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
105 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 106 | seq_puts(m, "\n"); |
91d68905 BVA |
107 | return 0; |
108 | } | |
109 | ||
110 | static ssize_t blk_queue_flags_store(struct file *file, const char __user *ubuf, | |
111 | size_t len, loff_t *offp) | |
112 | { | |
113 | struct request_queue *q = file_inode(file)->i_private; | |
114 | char op[16] = { }, *s; | |
115 | ||
116 | len = min(len, sizeof(op) - 1); | |
117 | if (copy_from_user(op, ubuf, len)) | |
118 | return -EFAULT; | |
119 | s = op; | |
120 | strsep(&s, " \t\n"); /* strip trailing whitespace */ | |
121 | if (strcmp(op, "run") == 0) { | |
122 | blk_mq_run_hw_queues(q, true); | |
123 | } else if (strcmp(op, "start") == 0) { | |
124 | blk_mq_start_stopped_hw_queues(q, true); | |
125 | } else { | |
126 | pr_err("%s: unsupported operation %s. Use either 'run' or 'start'\n", | |
127 | __func__, op); | |
128 | return -EINVAL; | |
129 | } | |
130 | return len; | |
131 | } | |
132 | ||
133 | static int blk_queue_flags_open(struct inode *inode, struct file *file) | |
134 | { | |
135 | return single_open(file, blk_queue_flags_show, inode->i_private); | |
136 | } | |
137 | ||
138 | static const struct file_operations blk_queue_flags_fops = { | |
139 | .open = blk_queue_flags_open, | |
140 | .read = seq_read, | |
141 | .llseek = seq_lseek, | |
142 | .release = single_release, | |
143 | .write = blk_queue_flags_store, | |
144 | }; | |
145 | ||
34dbad5d OS |
146 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
147 | { | |
148 | if (stat->nr_samples) { | |
149 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
150 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
151 | } else { | |
152 | seq_puts(m, "samples=0"); | |
153 | } | |
154 | } | |
155 | ||
156 | static int queue_poll_stat_show(struct seq_file *m, void *v) | |
157 | { | |
158 | struct request_queue *q = m->private; | |
0206319f | 159 | int bucket; |
34dbad5d | 160 | |
0206319f SB |
161 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
162 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
163 | print_stat(m, &q->poll_stat[2*bucket]); | |
164 | seq_puts(m, "\n"); | |
34dbad5d | 165 | |
0206319f SB |
166 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
167 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
168 | seq_puts(m, "\n"); | |
169 | } | |
34dbad5d OS |
170 | return 0; |
171 | } | |
172 | ||
173 | static int queue_poll_stat_open(struct inode *inode, struct file *file) | |
174 | { | |
175 | return single_open(file, queue_poll_stat_show, inode->i_private); | |
176 | } | |
177 | ||
178 | static const struct file_operations queue_poll_stat_fops = { | |
179 | .open = queue_poll_stat_open, | |
180 | .read = seq_read, | |
181 | .llseek = seq_lseek, | |
182 | .release = single_release, | |
183 | }; | |
184 | ||
1a435111 | 185 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 186 | static const char *const hctx_state_name[] = { |
1a435111 OS |
187 | HCTX_STATE_NAME(STOPPED), |
188 | HCTX_STATE_NAME(TAG_ACTIVE), | |
189 | HCTX_STATE_NAME(SCHED_RESTART), | |
190 | HCTX_STATE_NAME(TAG_WAITING), | |
191 | HCTX_STATE_NAME(START_ON_RUN), | |
f5c0b091 | 192 | }; |
1a435111 OS |
193 | #undef HCTX_STATE_NAME |
194 | ||
9abb2ad2 OS |
195 | static int hctx_state_show(struct seq_file *m, void *v) |
196 | { | |
197 | struct blk_mq_hw_ctx *hctx = m->private; | |
198 | ||
f5c0b091 BVA |
199 | blk_flags_show(m, hctx->state, hctx_state_name, |
200 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 201 | seq_puts(m, "\n"); |
9abb2ad2 OS |
202 | return 0; |
203 | } | |
204 | ||
205 | static int hctx_state_open(struct inode *inode, struct file *file) | |
206 | { | |
207 | return single_open(file, hctx_state_show, inode->i_private); | |
208 | } | |
209 | ||
210 | static const struct file_operations hctx_state_fops = { | |
211 | .open = hctx_state_open, | |
212 | .read = seq_read, | |
213 | .llseek = seq_lseek, | |
214 | .release = single_release, | |
215 | }; | |
216 | ||
1a435111 | 217 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 218 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
219 | BLK_TAG_ALLOC_NAME(FIFO), |
220 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 221 | }; |
1a435111 | 222 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 223 | |
1a435111 | 224 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 225 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
226 | HCTX_FLAG_NAME(SHOULD_MERGE), |
227 | HCTX_FLAG_NAME(TAG_SHARED), | |
228 | HCTX_FLAG_NAME(SG_MERGE), | |
229 | HCTX_FLAG_NAME(BLOCKING), | |
230 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 231 | }; |
1a435111 | 232 | #undef HCTX_FLAG_NAME |
f5c0b091 | 233 | |
9abb2ad2 OS |
234 | static int hctx_flags_show(struct seq_file *m, void *v) |
235 | { | |
236 | struct blk_mq_hw_ctx *hctx = m->private; | |
f5c0b091 | 237 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 238 | |
f5c0b091 BVA |
239 | seq_puts(m, "alloc_policy="); |
240 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
241 | alloc_policy_name[alloc_policy]) | |
242 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
243 | else | |
244 | seq_printf(m, "%d", alloc_policy); | |
245 | seq_puts(m, " "); | |
246 | blk_flags_show(m, | |
247 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
248 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 249 | seq_puts(m, "\n"); |
9abb2ad2 OS |
250 | return 0; |
251 | } | |
252 | ||
253 | static int hctx_flags_open(struct inode *inode, struct file *file) | |
254 | { | |
255 | return single_open(file, hctx_flags_show, inode->i_private); | |
256 | } | |
257 | ||
258 | static const struct file_operations hctx_flags_fops = { | |
259 | .open = hctx_flags_open, | |
260 | .read = seq_read, | |
261 | .llseek = seq_lseek, | |
262 | .release = single_release, | |
263 | }; | |
264 | ||
1a435111 | 265 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 266 | static const char *const op_name[] = { |
1a435111 OS |
267 | REQ_OP_NAME(READ), |
268 | REQ_OP_NAME(WRITE), | |
269 | REQ_OP_NAME(FLUSH), | |
270 | REQ_OP_NAME(DISCARD), | |
271 | REQ_OP_NAME(ZONE_REPORT), | |
272 | REQ_OP_NAME(SECURE_ERASE), | |
273 | REQ_OP_NAME(ZONE_RESET), | |
274 | REQ_OP_NAME(WRITE_SAME), | |
275 | REQ_OP_NAME(WRITE_ZEROES), | |
276 | REQ_OP_NAME(SCSI_IN), | |
277 | REQ_OP_NAME(SCSI_OUT), | |
278 | REQ_OP_NAME(DRV_IN), | |
279 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 280 | }; |
1a435111 | 281 | #undef REQ_OP_NAME |
8658dca8 | 282 | |
1a435111 | 283 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 284 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
285 | CMD_FLAG_NAME(FAILFAST_DEV), |
286 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
287 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
288 | CMD_FLAG_NAME(SYNC), | |
289 | CMD_FLAG_NAME(META), | |
290 | CMD_FLAG_NAME(PRIO), | |
291 | CMD_FLAG_NAME(NOMERGE), | |
292 | CMD_FLAG_NAME(IDLE), | |
293 | CMD_FLAG_NAME(INTEGRITY), | |
294 | CMD_FLAG_NAME(FUA), | |
295 | CMD_FLAG_NAME(PREFLUSH), | |
296 | CMD_FLAG_NAME(RAHEAD), | |
297 | CMD_FLAG_NAME(BACKGROUND), | |
298 | CMD_FLAG_NAME(NOUNMAP), | |
8658dca8 | 299 | }; |
1a435111 | 300 | #undef CMD_FLAG_NAME |
8658dca8 | 301 | |
1a435111 | 302 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 303 | static const char *const rqf_name[] = { |
1a435111 OS |
304 | RQF_NAME(SORTED), |
305 | RQF_NAME(STARTED), | |
306 | RQF_NAME(QUEUED), | |
307 | RQF_NAME(SOFTBARRIER), | |
308 | RQF_NAME(FLUSH_SEQ), | |
309 | RQF_NAME(MIXED_MERGE), | |
310 | RQF_NAME(MQ_INFLIGHT), | |
311 | RQF_NAME(DONTPREP), | |
312 | RQF_NAME(PREEMPT), | |
313 | RQF_NAME(COPY_USER), | |
314 | RQF_NAME(FAILED), | |
315 | RQF_NAME(QUIET), | |
316 | RQF_NAME(ELVPRIV), | |
317 | RQF_NAME(IO_STAT), | |
318 | RQF_NAME(ALLOCED), | |
319 | RQF_NAME(PM), | |
320 | RQF_NAME(HASHED), | |
321 | RQF_NAME(STATS), | |
322 | RQF_NAME(SPECIAL_PAYLOAD), | |
8658dca8 | 323 | }; |
1a435111 | 324 | #undef RQF_NAME |
8658dca8 | 325 | |
950cd7e9 OS |
326 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
327 | { | |
328 | struct request *rq = list_entry_rq(v); | |
2836ee4b | 329 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 330 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 331 | |
8658dca8 BVA |
332 | seq_printf(m, "%p {.op=", rq); |
333 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
334 | seq_printf(m, "%s", op_name[op]); | |
335 | else | |
336 | seq_printf(m, "%d", op); | |
337 | seq_puts(m, ", .cmd_flags="); | |
338 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
339 | ARRAY_SIZE(cmd_flag_name)); | |
340 | seq_puts(m, ", .rq_flags="); | |
341 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
342 | ARRAY_SIZE(rqf_name)); | |
2836ee4b | 343 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 344 | rq->internal_tag); |
2836ee4b BVA |
345 | if (mq_ops->show_rq) |
346 | mq_ops->show_rq(m, rq); | |
347 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
348 | return 0; |
349 | } | |
350 | ||
351 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 352 | __acquires(&hctx->lock) |
950cd7e9 OS |
353 | { |
354 | struct blk_mq_hw_ctx *hctx = m->private; | |
355 | ||
356 | spin_lock(&hctx->lock); | |
357 | return seq_list_start(&hctx->dispatch, *pos); | |
358 | } | |
359 | ||
360 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
361 | { | |
362 | struct blk_mq_hw_ctx *hctx = m->private; | |
363 | ||
364 | return seq_list_next(v, &hctx->dispatch, pos); | |
365 | } | |
366 | ||
367 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 368 | __releases(&hctx->lock) |
950cd7e9 OS |
369 | { |
370 | struct blk_mq_hw_ctx *hctx = m->private; | |
371 | ||
372 | spin_unlock(&hctx->lock); | |
373 | } | |
374 | ||
375 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
376 | .start = hctx_dispatch_start, | |
377 | .next = hctx_dispatch_next, | |
378 | .stop = hctx_dispatch_stop, | |
379 | .show = blk_mq_debugfs_rq_show, | |
380 | }; | |
381 | ||
382 | static int hctx_dispatch_open(struct inode *inode, struct file *file) | |
383 | { | |
384 | return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); | |
385 | } | |
386 | ||
387 | static const struct file_operations hctx_dispatch_fops = { | |
388 | .open = hctx_dispatch_open, | |
389 | .read = seq_read, | |
390 | .llseek = seq_lseek, | |
391 | .release = seq_release, | |
392 | }; | |
393 | ||
0bfa5288 OS |
394 | static int hctx_ctx_map_show(struct seq_file *m, void *v) |
395 | { | |
396 | struct blk_mq_hw_ctx *hctx = m->private; | |
397 | ||
398 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int hctx_ctx_map_open(struct inode *inode, struct file *file) | |
403 | { | |
404 | return single_open(file, hctx_ctx_map_show, inode->i_private); | |
405 | } | |
406 | ||
407 | static const struct file_operations hctx_ctx_map_fops = { | |
408 | .open = hctx_ctx_map_open, | |
409 | .read = seq_read, | |
410 | .llseek = seq_lseek, | |
411 | .release = single_release, | |
412 | }; | |
413 | ||
d96b37c0 OS |
414 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
415 | struct blk_mq_tags *tags) | |
416 | { | |
417 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
418 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
419 | seq_printf(m, "active_queues=%d\n", | |
420 | atomic_read(&tags->active_queues)); | |
421 | ||
422 | seq_puts(m, "\nbitmap_tags:\n"); | |
423 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
424 | ||
425 | if (tags->nr_reserved_tags) { | |
426 | seq_puts(m, "\nbreserved_tags:\n"); | |
427 | sbitmap_queue_show(&tags->breserved_tags, m); | |
428 | } | |
429 | } | |
430 | ||
431 | static int hctx_tags_show(struct seq_file *m, void *v) | |
432 | { | |
433 | struct blk_mq_hw_ctx *hctx = m->private; | |
434 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 435 | int res; |
d96b37c0 | 436 | |
8c0f14ea BVA |
437 | res = mutex_lock_interruptible(&q->sysfs_lock); |
438 | if (res) | |
439 | goto out; | |
d96b37c0 OS |
440 | if (hctx->tags) |
441 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
442 | mutex_unlock(&q->sysfs_lock); | |
443 | ||
8c0f14ea BVA |
444 | out: |
445 | return res; | |
d96b37c0 OS |
446 | } |
447 | ||
448 | static int hctx_tags_open(struct inode *inode, struct file *file) | |
449 | { | |
450 | return single_open(file, hctx_tags_show, inode->i_private); | |
451 | } | |
452 | ||
453 | static const struct file_operations hctx_tags_fops = { | |
454 | .open = hctx_tags_open, | |
455 | .read = seq_read, | |
456 | .llseek = seq_lseek, | |
457 | .release = single_release, | |
458 | }; | |
459 | ||
d7e3621a OS |
460 | static int hctx_tags_bitmap_show(struct seq_file *m, void *v) |
461 | { | |
462 | struct blk_mq_hw_ctx *hctx = m->private; | |
463 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 464 | int res; |
d7e3621a | 465 | |
8c0f14ea BVA |
466 | res = mutex_lock_interruptible(&q->sysfs_lock); |
467 | if (res) | |
468 | goto out; | |
d7e3621a OS |
469 | if (hctx->tags) |
470 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
471 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
472 | |
473 | out: | |
474 | return res; | |
d7e3621a OS |
475 | } |
476 | ||
477 | static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) | |
478 | { | |
479 | return single_open(file, hctx_tags_bitmap_show, inode->i_private); | |
480 | } | |
481 | ||
482 | static const struct file_operations hctx_tags_bitmap_fops = { | |
483 | .open = hctx_tags_bitmap_open, | |
484 | .read = seq_read, | |
485 | .llseek = seq_lseek, | |
486 | .release = single_release, | |
487 | }; | |
488 | ||
d96b37c0 OS |
489 | static int hctx_sched_tags_show(struct seq_file *m, void *v) |
490 | { | |
491 | struct blk_mq_hw_ctx *hctx = m->private; | |
492 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 493 | int res; |
d96b37c0 | 494 | |
8c0f14ea BVA |
495 | res = mutex_lock_interruptible(&q->sysfs_lock); |
496 | if (res) | |
497 | goto out; | |
d96b37c0 OS |
498 | if (hctx->sched_tags) |
499 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
500 | mutex_unlock(&q->sysfs_lock); | |
501 | ||
8c0f14ea BVA |
502 | out: |
503 | return res; | |
d96b37c0 OS |
504 | } |
505 | ||
506 | static int hctx_sched_tags_open(struct inode *inode, struct file *file) | |
507 | { | |
508 | return single_open(file, hctx_sched_tags_show, inode->i_private); | |
509 | } | |
510 | ||
511 | static const struct file_operations hctx_sched_tags_fops = { | |
512 | .open = hctx_sched_tags_open, | |
513 | .read = seq_read, | |
514 | .llseek = seq_lseek, | |
515 | .release = single_release, | |
516 | }; | |
517 | ||
d7e3621a OS |
518 | static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) |
519 | { | |
520 | struct blk_mq_hw_ctx *hctx = m->private; | |
521 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 522 | int res; |
d7e3621a | 523 | |
8c0f14ea BVA |
524 | res = mutex_lock_interruptible(&q->sysfs_lock); |
525 | if (res) | |
526 | goto out; | |
d7e3621a OS |
527 | if (hctx->sched_tags) |
528 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
529 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
530 | |
531 | out: | |
532 | return res; | |
d7e3621a OS |
533 | } |
534 | ||
535 | static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) | |
536 | { | |
537 | return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); | |
538 | } | |
539 | ||
540 | static const struct file_operations hctx_sched_tags_bitmap_fops = { | |
541 | .open = hctx_sched_tags_bitmap_open, | |
542 | .read = seq_read, | |
543 | .llseek = seq_lseek, | |
544 | .release = single_release, | |
545 | }; | |
546 | ||
be215473 OS |
547 | static int hctx_io_poll_show(struct seq_file *m, void *v) |
548 | { | |
549 | struct blk_mq_hw_ctx *hctx = m->private; | |
550 | ||
551 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
552 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
553 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
554 | return 0; | |
555 | } | |
556 | ||
557 | static int hctx_io_poll_open(struct inode *inode, struct file *file) | |
558 | { | |
559 | return single_open(file, hctx_io_poll_show, inode->i_private); | |
560 | } | |
561 | ||
562 | static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, | |
563 | size_t count, loff_t *ppos) | |
564 | { | |
565 | struct seq_file *m = file->private_data; | |
566 | struct blk_mq_hw_ctx *hctx = m->private; | |
567 | ||
568 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
569 | return count; | |
570 | } | |
571 | ||
572 | static const struct file_operations hctx_io_poll_fops = { | |
573 | .open = hctx_io_poll_open, | |
574 | .read = seq_read, | |
575 | .write = hctx_io_poll_write, | |
576 | .llseek = seq_lseek, | |
577 | .release = single_release, | |
578 | }; | |
579 | ||
be215473 OS |
580 | static int hctx_dispatched_show(struct seq_file *m, void *v) |
581 | { | |
582 | struct blk_mq_hw_ctx *hctx = m->private; | |
583 | int i; | |
584 | ||
585 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
586 | ||
587 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
588 | unsigned int d = 1U << (i - 1); | |
589 | ||
590 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
591 | } | |
592 | ||
593 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static int hctx_dispatched_open(struct inode *inode, struct file *file) | |
598 | { | |
599 | return single_open(file, hctx_dispatched_show, inode->i_private); | |
600 | } | |
601 | ||
602 | static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, | |
603 | size_t count, loff_t *ppos) | |
604 | { | |
605 | struct seq_file *m = file->private_data; | |
606 | struct blk_mq_hw_ctx *hctx = m->private; | |
607 | int i; | |
608 | ||
609 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
610 | hctx->dispatched[i] = 0; | |
611 | return count; | |
612 | } | |
613 | ||
614 | static const struct file_operations hctx_dispatched_fops = { | |
615 | .open = hctx_dispatched_open, | |
616 | .read = seq_read, | |
617 | .write = hctx_dispatched_write, | |
618 | .llseek = seq_lseek, | |
619 | .release = single_release, | |
620 | }; | |
621 | ||
4a46f05e OS |
622 | static int hctx_queued_show(struct seq_file *m, void *v) |
623 | { | |
624 | struct blk_mq_hw_ctx *hctx = m->private; | |
625 | ||
626 | seq_printf(m, "%lu\n", hctx->queued); | |
627 | return 0; | |
628 | } | |
629 | ||
630 | static int hctx_queued_open(struct inode *inode, struct file *file) | |
631 | { | |
632 | return single_open(file, hctx_queued_show, inode->i_private); | |
633 | } | |
634 | ||
635 | static ssize_t hctx_queued_write(struct file *file, const char __user *buf, | |
636 | size_t count, loff_t *ppos) | |
637 | { | |
638 | struct seq_file *m = file->private_data; | |
639 | struct blk_mq_hw_ctx *hctx = m->private; | |
640 | ||
641 | hctx->queued = 0; | |
642 | return count; | |
643 | } | |
644 | ||
645 | static const struct file_operations hctx_queued_fops = { | |
646 | .open = hctx_queued_open, | |
647 | .read = seq_read, | |
648 | .write = hctx_queued_write, | |
649 | .llseek = seq_lseek, | |
650 | .release = single_release, | |
651 | }; | |
652 | ||
653 | static int hctx_run_show(struct seq_file *m, void *v) | |
654 | { | |
655 | struct blk_mq_hw_ctx *hctx = m->private; | |
656 | ||
657 | seq_printf(m, "%lu\n", hctx->run); | |
658 | return 0; | |
659 | } | |
660 | ||
661 | static int hctx_run_open(struct inode *inode, struct file *file) | |
662 | { | |
663 | return single_open(file, hctx_run_show, inode->i_private); | |
664 | } | |
665 | ||
666 | static ssize_t hctx_run_write(struct file *file, const char __user *buf, | |
667 | size_t count, loff_t *ppos) | |
668 | { | |
669 | struct seq_file *m = file->private_data; | |
670 | struct blk_mq_hw_ctx *hctx = m->private; | |
671 | ||
672 | hctx->run = 0; | |
673 | return count; | |
674 | } | |
675 | ||
676 | static const struct file_operations hctx_run_fops = { | |
677 | .open = hctx_run_open, | |
678 | .read = seq_read, | |
679 | .write = hctx_run_write, | |
680 | .llseek = seq_lseek, | |
681 | .release = single_release, | |
682 | }; | |
683 | ||
684 | static int hctx_active_show(struct seq_file *m, void *v) | |
685 | { | |
686 | struct blk_mq_hw_ctx *hctx = m->private; | |
687 | ||
688 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static int hctx_active_open(struct inode *inode, struct file *file) | |
693 | { | |
694 | return single_open(file, hctx_active_show, inode->i_private); | |
695 | } | |
696 | ||
697 | static const struct file_operations hctx_active_fops = { | |
698 | .open = hctx_active_open, | |
699 | .read = seq_read, | |
700 | .llseek = seq_lseek, | |
701 | .release = single_release, | |
702 | }; | |
703 | ||
950cd7e9 | 704 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 705 | __acquires(&ctx->lock) |
950cd7e9 OS |
706 | { |
707 | struct blk_mq_ctx *ctx = m->private; | |
708 | ||
709 | spin_lock(&ctx->lock); | |
710 | return seq_list_start(&ctx->rq_list, *pos); | |
711 | } | |
712 | ||
713 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
714 | { | |
715 | struct blk_mq_ctx *ctx = m->private; | |
716 | ||
717 | return seq_list_next(v, &ctx->rq_list, pos); | |
718 | } | |
719 | ||
720 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 721 | __releases(&ctx->lock) |
950cd7e9 OS |
722 | { |
723 | struct blk_mq_ctx *ctx = m->private; | |
724 | ||
725 | spin_unlock(&ctx->lock); | |
726 | } | |
727 | ||
728 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
729 | .start = ctx_rq_list_start, | |
730 | .next = ctx_rq_list_next, | |
731 | .stop = ctx_rq_list_stop, | |
732 | .show = blk_mq_debugfs_rq_show, | |
733 | }; | |
734 | ||
735 | static int ctx_rq_list_open(struct inode *inode, struct file *file) | |
736 | { | |
737 | return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); | |
738 | } | |
739 | ||
740 | static const struct file_operations ctx_rq_list_fops = { | |
741 | .open = ctx_rq_list_open, | |
742 | .read = seq_read, | |
743 | .llseek = seq_lseek, | |
744 | .release = seq_release, | |
745 | }; | |
746 | ||
4a46f05e OS |
747 | static int ctx_dispatched_show(struct seq_file *m, void *v) |
748 | { | |
749 | struct blk_mq_ctx *ctx = m->private; | |
750 | ||
751 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
752 | return 0; | |
753 | } | |
754 | ||
755 | static int ctx_dispatched_open(struct inode *inode, struct file *file) | |
756 | { | |
757 | return single_open(file, ctx_dispatched_show, inode->i_private); | |
758 | } | |
759 | ||
760 | static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, | |
761 | size_t count, loff_t *ppos) | |
762 | { | |
763 | struct seq_file *m = file->private_data; | |
764 | struct blk_mq_ctx *ctx = m->private; | |
765 | ||
766 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
767 | return count; | |
768 | } | |
769 | ||
770 | static const struct file_operations ctx_dispatched_fops = { | |
771 | .open = ctx_dispatched_open, | |
772 | .read = seq_read, | |
773 | .write = ctx_dispatched_write, | |
774 | .llseek = seq_lseek, | |
775 | .release = single_release, | |
776 | }; | |
777 | ||
778 | static int ctx_merged_show(struct seq_file *m, void *v) | |
779 | { | |
780 | struct blk_mq_ctx *ctx = m->private; | |
781 | ||
782 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static int ctx_merged_open(struct inode *inode, struct file *file) | |
787 | { | |
788 | return single_open(file, ctx_merged_show, inode->i_private); | |
789 | } | |
790 | ||
791 | static ssize_t ctx_merged_write(struct file *file, const char __user *buf, | |
792 | size_t count, loff_t *ppos) | |
793 | { | |
794 | struct seq_file *m = file->private_data; | |
795 | struct blk_mq_ctx *ctx = m->private; | |
796 | ||
797 | ctx->rq_merged = 0; | |
798 | return count; | |
799 | } | |
800 | ||
801 | static const struct file_operations ctx_merged_fops = { | |
802 | .open = ctx_merged_open, | |
803 | .read = seq_read, | |
804 | .write = ctx_merged_write, | |
805 | .llseek = seq_lseek, | |
806 | .release = single_release, | |
807 | }; | |
808 | ||
809 | static int ctx_completed_show(struct seq_file *m, void *v) | |
810 | { | |
811 | struct blk_mq_ctx *ctx = m->private; | |
812 | ||
813 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
814 | return 0; | |
815 | } | |
816 | ||
817 | static int ctx_completed_open(struct inode *inode, struct file *file) | |
818 | { | |
819 | return single_open(file, ctx_completed_show, inode->i_private); | |
820 | } | |
821 | ||
822 | static ssize_t ctx_completed_write(struct file *file, const char __user *buf, | |
823 | size_t count, loff_t *ppos) | |
824 | { | |
825 | struct seq_file *m = file->private_data; | |
826 | struct blk_mq_ctx *ctx = m->private; | |
827 | ||
828 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
829 | return count; | |
830 | } | |
831 | ||
832 | static const struct file_operations ctx_completed_fops = { | |
833 | .open = ctx_completed_open, | |
834 | .read = seq_read, | |
835 | .write = ctx_completed_write, | |
836 | .llseek = seq_lseek, | |
837 | .release = single_release, | |
838 | }; | |
839 | ||
34dbad5d OS |
840 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
841 | {"poll_stat", 0400, &queue_poll_stat_fops}, | |
65ca1ca3 | 842 | {"state", 0600, &blk_queue_flags_fops}, |
34dbad5d OS |
843 | {}, |
844 | }; | |
845 | ||
07e4fead | 846 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
9abb2ad2 OS |
847 | {"state", 0400, &hctx_state_fops}, |
848 | {"flags", 0400, &hctx_flags_fops}, | |
950cd7e9 | 849 | {"dispatch", 0400, &hctx_dispatch_fops}, |
0bfa5288 | 850 | {"ctx_map", 0400, &hctx_ctx_map_fops}, |
d96b37c0 | 851 | {"tags", 0400, &hctx_tags_fops}, |
d7e3621a | 852 | {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, |
d96b37c0 | 853 | {"sched_tags", 0400, &hctx_sched_tags_fops}, |
d7e3621a | 854 | {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, |
be215473 | 855 | {"io_poll", 0600, &hctx_io_poll_fops}, |
be215473 | 856 | {"dispatched", 0600, &hctx_dispatched_fops}, |
4a46f05e OS |
857 | {"queued", 0600, &hctx_queued_fops}, |
858 | {"run", 0600, &hctx_run_fops}, | |
859 | {"active", 0400, &hctx_active_fops}, | |
72f2f8f6 | 860 | {}, |
07e4fead OS |
861 | }; |
862 | ||
863 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
950cd7e9 | 864 | {"rq_list", 0400, &ctx_rq_list_fops}, |
4a46f05e OS |
865 | {"dispatched", 0600, &ctx_dispatched_fops}, |
866 | {"merged", 0600, &ctx_merged_fops}, | |
867 | {"completed", 0600, &ctx_completed_fops}, | |
72f2f8f6 | 868 | {}, |
07e4fead OS |
869 | }; |
870 | ||
4c9e4019 | 871 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 872 | { |
18fbda91 | 873 | if (!blk_debugfs_root) |
07e4fead OS |
874 | return -ENOENT; |
875 | ||
4c9e4019 BVA |
876 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
877 | blk_debugfs_root); | |
07e4fead OS |
878 | if (!q->debugfs_dir) |
879 | goto err; | |
880 | ||
62d6c949 | 881 | if (blk_mq_debugfs_register_mq(q)) |
07e4fead OS |
882 | goto err; |
883 | ||
884 | return 0; | |
885 | ||
886 | err: | |
887 | blk_mq_debugfs_unregister(q); | |
888 | return -ENOMEM; | |
889 | } | |
890 | ||
891 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
892 | { | |
893 | debugfs_remove_recursive(q->debugfs_dir); | |
894 | q->mq_debugfs_dir = NULL; | |
895 | q->debugfs_dir = NULL; | |
896 | } | |
897 | ||
72f2f8f6 BVA |
898 | static bool debugfs_create_files(struct dentry *parent, void *data, |
899 | const struct blk_mq_debugfs_attr *attr) | |
900 | { | |
901 | for (; attr->name; attr++) { | |
902 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
903 | data, attr->fops)) | |
904 | return false; | |
905 | } | |
906 | return true; | |
907 | } | |
908 | ||
07e4fead OS |
909 | static int blk_mq_debugfs_register_ctx(struct request_queue *q, |
910 | struct blk_mq_ctx *ctx, | |
911 | struct dentry *hctx_dir) | |
912 | { | |
913 | struct dentry *ctx_dir; | |
914 | char name[20]; | |
07e4fead OS |
915 | |
916 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
917 | ctx_dir = debugfs_create_dir(name, hctx_dir); | |
918 | if (!ctx_dir) | |
919 | return -ENOMEM; | |
920 | ||
72f2f8f6 BVA |
921 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
922 | return -ENOMEM; | |
07e4fead OS |
923 | |
924 | return 0; | |
925 | } | |
926 | ||
927 | static int blk_mq_debugfs_register_hctx(struct request_queue *q, | |
928 | struct blk_mq_hw_ctx *hctx) | |
929 | { | |
930 | struct blk_mq_ctx *ctx; | |
931 | struct dentry *hctx_dir; | |
932 | char name[20]; | |
933 | int i; | |
934 | ||
935 | snprintf(name, sizeof(name), "%u", hctx->queue_num); | |
936 | hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); | |
937 | if (!hctx_dir) | |
938 | return -ENOMEM; | |
939 | ||
72f2f8f6 BVA |
940 | if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) |
941 | return -ENOMEM; | |
07e4fead OS |
942 | |
943 | hctx_for_each_ctx(hctx, ctx, i) { | |
944 | if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) | |
945 | return -ENOMEM; | |
946 | } | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
62d6c949 | 951 | int blk_mq_debugfs_register_mq(struct request_queue *q) |
07e4fead OS |
952 | { |
953 | struct blk_mq_hw_ctx *hctx; | |
954 | int i; | |
955 | ||
956 | if (!q->debugfs_dir) | |
957 | return -ENOENT; | |
958 | ||
959 | q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); | |
960 | if (!q->mq_debugfs_dir) | |
961 | goto err; | |
962 | ||
34dbad5d OS |
963 | if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs)) |
964 | goto err; | |
965 | ||
07e4fead OS |
966 | queue_for_each_hw_ctx(q, hctx, i) { |
967 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
968 | goto err; | |
969 | } | |
970 | ||
971 | return 0; | |
972 | ||
973 | err: | |
62d6c949 | 974 | blk_mq_debugfs_unregister_mq(q); |
07e4fead OS |
975 | return -ENOMEM; |
976 | } | |
977 | ||
62d6c949 | 978 | void blk_mq_debugfs_unregister_mq(struct request_queue *q) |
07e4fead OS |
979 | { |
980 | debugfs_remove_recursive(q->mq_debugfs_dir); | |
981 | q->mq_debugfs_dir = NULL; | |
982 | } |