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 | ||
c7e4145a OS |
110 | static ssize_t blk_queue_flags_store(struct file *file, const char __user *buf, |
111 | size_t count, loff_t *ppos) | |
91d68905 BVA |
112 | { |
113 | struct request_queue *q = file_inode(file)->i_private; | |
71b90511 | 114 | char opbuf[16] = { }, *op; |
91d68905 | 115 | |
71b90511 | 116 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
117 | pr_err("%s: operation too long\n", __func__); |
118 | goto inval; | |
119 | } | |
120 | ||
71b90511 | 121 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 122 | return -EFAULT; |
71b90511 | 123 | op = strstrip(opbuf); |
91d68905 BVA |
124 | if (strcmp(op, "run") == 0) { |
125 | blk_mq_run_hw_queues(q, true); | |
126 | } else if (strcmp(op, "start") == 0) { | |
127 | blk_mq_start_stopped_hw_queues(q, true); | |
128 | } else { | |
c7e4145a OS |
129 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
130 | inval: | |
131 | pr_err("%s: use either 'run' or 'start'\n", __func__); | |
91d68905 BVA |
132 | return -EINVAL; |
133 | } | |
c7e4145a | 134 | return count; |
91d68905 BVA |
135 | } |
136 | ||
137 | static int blk_queue_flags_open(struct inode *inode, struct file *file) | |
138 | { | |
139 | return single_open(file, blk_queue_flags_show, inode->i_private); | |
140 | } | |
141 | ||
142 | static const struct file_operations blk_queue_flags_fops = { | |
143 | .open = blk_queue_flags_open, | |
144 | .read = seq_read, | |
145 | .llseek = seq_lseek, | |
146 | .release = single_release, | |
147 | .write = blk_queue_flags_store, | |
148 | }; | |
149 | ||
34dbad5d OS |
150 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
151 | { | |
152 | if (stat->nr_samples) { | |
153 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
154 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
155 | } else { | |
156 | seq_puts(m, "samples=0"); | |
157 | } | |
158 | } | |
159 | ||
160 | static int queue_poll_stat_show(struct seq_file *m, void *v) | |
161 | { | |
162 | struct request_queue *q = m->private; | |
0206319f | 163 | int bucket; |
34dbad5d | 164 | |
0206319f SB |
165 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
166 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
167 | print_stat(m, &q->poll_stat[2*bucket]); | |
168 | seq_puts(m, "\n"); | |
34dbad5d | 169 | |
0206319f SB |
170 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
171 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
172 | seq_puts(m, "\n"); | |
173 | } | |
34dbad5d OS |
174 | return 0; |
175 | } | |
176 | ||
177 | static int queue_poll_stat_open(struct inode *inode, struct file *file) | |
178 | { | |
179 | return single_open(file, queue_poll_stat_show, inode->i_private); | |
180 | } | |
181 | ||
182 | static const struct file_operations queue_poll_stat_fops = { | |
183 | .open = queue_poll_stat_open, | |
184 | .read = seq_read, | |
185 | .llseek = seq_lseek, | |
186 | .release = single_release, | |
187 | }; | |
188 | ||
1a435111 | 189 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 190 | static const char *const hctx_state_name[] = { |
1a435111 OS |
191 | HCTX_STATE_NAME(STOPPED), |
192 | HCTX_STATE_NAME(TAG_ACTIVE), | |
193 | HCTX_STATE_NAME(SCHED_RESTART), | |
194 | HCTX_STATE_NAME(TAG_WAITING), | |
195 | HCTX_STATE_NAME(START_ON_RUN), | |
f5c0b091 | 196 | }; |
1a435111 OS |
197 | #undef HCTX_STATE_NAME |
198 | ||
9abb2ad2 OS |
199 | static int hctx_state_show(struct seq_file *m, void *v) |
200 | { | |
201 | struct blk_mq_hw_ctx *hctx = m->private; | |
202 | ||
f5c0b091 BVA |
203 | blk_flags_show(m, hctx->state, hctx_state_name, |
204 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 205 | seq_puts(m, "\n"); |
9abb2ad2 OS |
206 | return 0; |
207 | } | |
208 | ||
209 | static int hctx_state_open(struct inode *inode, struct file *file) | |
210 | { | |
211 | return single_open(file, hctx_state_show, inode->i_private); | |
212 | } | |
213 | ||
214 | static const struct file_operations hctx_state_fops = { | |
215 | .open = hctx_state_open, | |
216 | .read = seq_read, | |
217 | .llseek = seq_lseek, | |
218 | .release = single_release, | |
219 | }; | |
220 | ||
1a435111 | 221 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 222 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
223 | BLK_TAG_ALLOC_NAME(FIFO), |
224 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 225 | }; |
1a435111 | 226 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 227 | |
1a435111 | 228 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 229 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
230 | HCTX_FLAG_NAME(SHOULD_MERGE), |
231 | HCTX_FLAG_NAME(TAG_SHARED), | |
232 | HCTX_FLAG_NAME(SG_MERGE), | |
233 | HCTX_FLAG_NAME(BLOCKING), | |
234 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 235 | }; |
1a435111 | 236 | #undef HCTX_FLAG_NAME |
f5c0b091 | 237 | |
9abb2ad2 OS |
238 | static int hctx_flags_show(struct seq_file *m, void *v) |
239 | { | |
240 | struct blk_mq_hw_ctx *hctx = m->private; | |
f5c0b091 | 241 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 242 | |
f5c0b091 BVA |
243 | seq_puts(m, "alloc_policy="); |
244 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
245 | alloc_policy_name[alloc_policy]) | |
246 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
247 | else | |
248 | seq_printf(m, "%d", alloc_policy); | |
249 | seq_puts(m, " "); | |
250 | blk_flags_show(m, | |
251 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
252 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 253 | seq_puts(m, "\n"); |
9abb2ad2 OS |
254 | return 0; |
255 | } | |
256 | ||
257 | static int hctx_flags_open(struct inode *inode, struct file *file) | |
258 | { | |
259 | return single_open(file, hctx_flags_show, inode->i_private); | |
260 | } | |
261 | ||
262 | static const struct file_operations hctx_flags_fops = { | |
263 | .open = hctx_flags_open, | |
264 | .read = seq_read, | |
265 | .llseek = seq_lseek, | |
266 | .release = single_release, | |
267 | }; | |
268 | ||
1a435111 | 269 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 270 | static const char *const op_name[] = { |
1a435111 OS |
271 | REQ_OP_NAME(READ), |
272 | REQ_OP_NAME(WRITE), | |
273 | REQ_OP_NAME(FLUSH), | |
274 | REQ_OP_NAME(DISCARD), | |
275 | REQ_OP_NAME(ZONE_REPORT), | |
276 | REQ_OP_NAME(SECURE_ERASE), | |
277 | REQ_OP_NAME(ZONE_RESET), | |
278 | REQ_OP_NAME(WRITE_SAME), | |
279 | REQ_OP_NAME(WRITE_ZEROES), | |
280 | REQ_OP_NAME(SCSI_IN), | |
281 | REQ_OP_NAME(SCSI_OUT), | |
282 | REQ_OP_NAME(DRV_IN), | |
283 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 284 | }; |
1a435111 | 285 | #undef REQ_OP_NAME |
8658dca8 | 286 | |
1a435111 | 287 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 288 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
289 | CMD_FLAG_NAME(FAILFAST_DEV), |
290 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
291 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
292 | CMD_FLAG_NAME(SYNC), | |
293 | CMD_FLAG_NAME(META), | |
294 | CMD_FLAG_NAME(PRIO), | |
295 | CMD_FLAG_NAME(NOMERGE), | |
296 | CMD_FLAG_NAME(IDLE), | |
297 | CMD_FLAG_NAME(INTEGRITY), | |
298 | CMD_FLAG_NAME(FUA), | |
299 | CMD_FLAG_NAME(PREFLUSH), | |
300 | CMD_FLAG_NAME(RAHEAD), | |
301 | CMD_FLAG_NAME(BACKGROUND), | |
302 | CMD_FLAG_NAME(NOUNMAP), | |
8658dca8 | 303 | }; |
1a435111 | 304 | #undef CMD_FLAG_NAME |
8658dca8 | 305 | |
1a435111 | 306 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 307 | static const char *const rqf_name[] = { |
1a435111 OS |
308 | RQF_NAME(SORTED), |
309 | RQF_NAME(STARTED), | |
310 | RQF_NAME(QUEUED), | |
311 | RQF_NAME(SOFTBARRIER), | |
312 | RQF_NAME(FLUSH_SEQ), | |
313 | RQF_NAME(MIXED_MERGE), | |
314 | RQF_NAME(MQ_INFLIGHT), | |
315 | RQF_NAME(DONTPREP), | |
316 | RQF_NAME(PREEMPT), | |
317 | RQF_NAME(COPY_USER), | |
318 | RQF_NAME(FAILED), | |
319 | RQF_NAME(QUIET), | |
320 | RQF_NAME(ELVPRIV), | |
321 | RQF_NAME(IO_STAT), | |
322 | RQF_NAME(ALLOCED), | |
323 | RQF_NAME(PM), | |
324 | RQF_NAME(HASHED), | |
325 | RQF_NAME(STATS), | |
326 | RQF_NAME(SPECIAL_PAYLOAD), | |
8658dca8 | 327 | }; |
1a435111 | 328 | #undef RQF_NAME |
8658dca8 | 329 | |
950cd7e9 OS |
330 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
331 | { | |
332 | struct request *rq = list_entry_rq(v); | |
2836ee4b | 333 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 334 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 335 | |
8658dca8 BVA |
336 | seq_printf(m, "%p {.op=", rq); |
337 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
338 | seq_printf(m, "%s", op_name[op]); | |
339 | else | |
340 | seq_printf(m, "%d", op); | |
341 | seq_puts(m, ", .cmd_flags="); | |
342 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
343 | ARRAY_SIZE(cmd_flag_name)); | |
344 | seq_puts(m, ", .rq_flags="); | |
345 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
346 | ARRAY_SIZE(rqf_name)); | |
2836ee4b | 347 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 348 | rq->internal_tag); |
2836ee4b BVA |
349 | if (mq_ops->show_rq) |
350 | mq_ops->show_rq(m, rq); | |
351 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
352 | return 0; |
353 | } | |
354 | ||
355 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 356 | __acquires(&hctx->lock) |
950cd7e9 OS |
357 | { |
358 | struct blk_mq_hw_ctx *hctx = m->private; | |
359 | ||
360 | spin_lock(&hctx->lock); | |
361 | return seq_list_start(&hctx->dispatch, *pos); | |
362 | } | |
363 | ||
364 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
365 | { | |
366 | struct blk_mq_hw_ctx *hctx = m->private; | |
367 | ||
368 | return seq_list_next(v, &hctx->dispatch, pos); | |
369 | } | |
370 | ||
371 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 372 | __releases(&hctx->lock) |
950cd7e9 OS |
373 | { |
374 | struct blk_mq_hw_ctx *hctx = m->private; | |
375 | ||
376 | spin_unlock(&hctx->lock); | |
377 | } | |
378 | ||
379 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
380 | .start = hctx_dispatch_start, | |
381 | .next = hctx_dispatch_next, | |
382 | .stop = hctx_dispatch_stop, | |
383 | .show = blk_mq_debugfs_rq_show, | |
384 | }; | |
385 | ||
386 | static int hctx_dispatch_open(struct inode *inode, struct file *file) | |
387 | { | |
388 | return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); | |
389 | } | |
390 | ||
391 | static const struct file_operations hctx_dispatch_fops = { | |
392 | .open = hctx_dispatch_open, | |
393 | .read = seq_read, | |
394 | .llseek = seq_lseek, | |
395 | .release = seq_release, | |
396 | }; | |
397 | ||
0bfa5288 OS |
398 | static int hctx_ctx_map_show(struct seq_file *m, void *v) |
399 | { | |
400 | struct blk_mq_hw_ctx *hctx = m->private; | |
401 | ||
402 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static int hctx_ctx_map_open(struct inode *inode, struct file *file) | |
407 | { | |
408 | return single_open(file, hctx_ctx_map_show, inode->i_private); | |
409 | } | |
410 | ||
411 | static const struct file_operations hctx_ctx_map_fops = { | |
412 | .open = hctx_ctx_map_open, | |
413 | .read = seq_read, | |
414 | .llseek = seq_lseek, | |
415 | .release = single_release, | |
416 | }; | |
417 | ||
d96b37c0 OS |
418 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
419 | struct blk_mq_tags *tags) | |
420 | { | |
421 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
422 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
423 | seq_printf(m, "active_queues=%d\n", | |
424 | atomic_read(&tags->active_queues)); | |
425 | ||
426 | seq_puts(m, "\nbitmap_tags:\n"); | |
427 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
428 | ||
429 | if (tags->nr_reserved_tags) { | |
430 | seq_puts(m, "\nbreserved_tags:\n"); | |
431 | sbitmap_queue_show(&tags->breserved_tags, m); | |
432 | } | |
433 | } | |
434 | ||
435 | static int hctx_tags_show(struct seq_file *m, void *v) | |
436 | { | |
437 | struct blk_mq_hw_ctx *hctx = m->private; | |
438 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 439 | int res; |
d96b37c0 | 440 | |
8c0f14ea BVA |
441 | res = mutex_lock_interruptible(&q->sysfs_lock); |
442 | if (res) | |
443 | goto out; | |
d96b37c0 OS |
444 | if (hctx->tags) |
445 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
446 | mutex_unlock(&q->sysfs_lock); | |
447 | ||
8c0f14ea BVA |
448 | out: |
449 | return res; | |
d96b37c0 OS |
450 | } |
451 | ||
452 | static int hctx_tags_open(struct inode *inode, struct file *file) | |
453 | { | |
454 | return single_open(file, hctx_tags_show, inode->i_private); | |
455 | } | |
456 | ||
457 | static const struct file_operations hctx_tags_fops = { | |
458 | .open = hctx_tags_open, | |
459 | .read = seq_read, | |
460 | .llseek = seq_lseek, | |
461 | .release = single_release, | |
462 | }; | |
463 | ||
d7e3621a OS |
464 | static int hctx_tags_bitmap_show(struct seq_file *m, void *v) |
465 | { | |
466 | struct blk_mq_hw_ctx *hctx = m->private; | |
467 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 468 | int res; |
d7e3621a | 469 | |
8c0f14ea BVA |
470 | res = mutex_lock_interruptible(&q->sysfs_lock); |
471 | if (res) | |
472 | goto out; | |
d7e3621a OS |
473 | if (hctx->tags) |
474 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
475 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
476 | |
477 | out: | |
478 | return res; | |
d7e3621a OS |
479 | } |
480 | ||
481 | static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) | |
482 | { | |
483 | return single_open(file, hctx_tags_bitmap_show, inode->i_private); | |
484 | } | |
485 | ||
486 | static const struct file_operations hctx_tags_bitmap_fops = { | |
487 | .open = hctx_tags_bitmap_open, | |
488 | .read = seq_read, | |
489 | .llseek = seq_lseek, | |
490 | .release = single_release, | |
491 | }; | |
492 | ||
d96b37c0 OS |
493 | static int hctx_sched_tags_show(struct seq_file *m, void *v) |
494 | { | |
495 | struct blk_mq_hw_ctx *hctx = m->private; | |
496 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 497 | int res; |
d96b37c0 | 498 | |
8c0f14ea BVA |
499 | res = mutex_lock_interruptible(&q->sysfs_lock); |
500 | if (res) | |
501 | goto out; | |
d96b37c0 OS |
502 | if (hctx->sched_tags) |
503 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
504 | mutex_unlock(&q->sysfs_lock); | |
505 | ||
8c0f14ea BVA |
506 | out: |
507 | return res; | |
d96b37c0 OS |
508 | } |
509 | ||
510 | static int hctx_sched_tags_open(struct inode *inode, struct file *file) | |
511 | { | |
512 | return single_open(file, hctx_sched_tags_show, inode->i_private); | |
513 | } | |
514 | ||
515 | static const struct file_operations hctx_sched_tags_fops = { | |
516 | .open = hctx_sched_tags_open, | |
517 | .read = seq_read, | |
518 | .llseek = seq_lseek, | |
519 | .release = single_release, | |
520 | }; | |
521 | ||
d7e3621a OS |
522 | static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) |
523 | { | |
524 | struct blk_mq_hw_ctx *hctx = m->private; | |
525 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 526 | int res; |
d7e3621a | 527 | |
8c0f14ea BVA |
528 | res = mutex_lock_interruptible(&q->sysfs_lock); |
529 | if (res) | |
530 | goto out; | |
d7e3621a OS |
531 | if (hctx->sched_tags) |
532 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
533 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
534 | |
535 | out: | |
536 | return res; | |
d7e3621a OS |
537 | } |
538 | ||
539 | static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) | |
540 | { | |
541 | return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); | |
542 | } | |
543 | ||
544 | static const struct file_operations hctx_sched_tags_bitmap_fops = { | |
545 | .open = hctx_sched_tags_bitmap_open, | |
546 | .read = seq_read, | |
547 | .llseek = seq_lseek, | |
548 | .release = single_release, | |
549 | }; | |
550 | ||
be215473 OS |
551 | static int hctx_io_poll_show(struct seq_file *m, void *v) |
552 | { | |
553 | struct blk_mq_hw_ctx *hctx = m->private; | |
554 | ||
555 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
556 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
557 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | static int hctx_io_poll_open(struct inode *inode, struct file *file) | |
562 | { | |
563 | return single_open(file, hctx_io_poll_show, inode->i_private); | |
564 | } | |
565 | ||
566 | static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, | |
567 | size_t count, loff_t *ppos) | |
568 | { | |
569 | struct seq_file *m = file->private_data; | |
570 | struct blk_mq_hw_ctx *hctx = m->private; | |
571 | ||
572 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
573 | return count; | |
574 | } | |
575 | ||
576 | static const struct file_operations hctx_io_poll_fops = { | |
577 | .open = hctx_io_poll_open, | |
578 | .read = seq_read, | |
579 | .write = hctx_io_poll_write, | |
580 | .llseek = seq_lseek, | |
581 | .release = single_release, | |
582 | }; | |
583 | ||
be215473 OS |
584 | static int hctx_dispatched_show(struct seq_file *m, void *v) |
585 | { | |
586 | struct blk_mq_hw_ctx *hctx = m->private; | |
587 | int i; | |
588 | ||
589 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
590 | ||
591 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
592 | unsigned int d = 1U << (i - 1); | |
593 | ||
594 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
595 | } | |
596 | ||
597 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
598 | return 0; | |
599 | } | |
600 | ||
601 | static int hctx_dispatched_open(struct inode *inode, struct file *file) | |
602 | { | |
603 | return single_open(file, hctx_dispatched_show, inode->i_private); | |
604 | } | |
605 | ||
606 | static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, | |
607 | size_t count, loff_t *ppos) | |
608 | { | |
609 | struct seq_file *m = file->private_data; | |
610 | struct blk_mq_hw_ctx *hctx = m->private; | |
611 | int i; | |
612 | ||
613 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
614 | hctx->dispatched[i] = 0; | |
615 | return count; | |
616 | } | |
617 | ||
618 | static const struct file_operations hctx_dispatched_fops = { | |
619 | .open = hctx_dispatched_open, | |
620 | .read = seq_read, | |
621 | .write = hctx_dispatched_write, | |
622 | .llseek = seq_lseek, | |
623 | .release = single_release, | |
624 | }; | |
625 | ||
4a46f05e OS |
626 | static int hctx_queued_show(struct seq_file *m, void *v) |
627 | { | |
628 | struct blk_mq_hw_ctx *hctx = m->private; | |
629 | ||
630 | seq_printf(m, "%lu\n", hctx->queued); | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static int hctx_queued_open(struct inode *inode, struct file *file) | |
635 | { | |
636 | return single_open(file, hctx_queued_show, inode->i_private); | |
637 | } | |
638 | ||
639 | static ssize_t hctx_queued_write(struct file *file, const char __user *buf, | |
640 | size_t count, loff_t *ppos) | |
641 | { | |
642 | struct seq_file *m = file->private_data; | |
643 | struct blk_mq_hw_ctx *hctx = m->private; | |
644 | ||
645 | hctx->queued = 0; | |
646 | return count; | |
647 | } | |
648 | ||
649 | static const struct file_operations hctx_queued_fops = { | |
650 | .open = hctx_queued_open, | |
651 | .read = seq_read, | |
652 | .write = hctx_queued_write, | |
653 | .llseek = seq_lseek, | |
654 | .release = single_release, | |
655 | }; | |
656 | ||
657 | static int hctx_run_show(struct seq_file *m, void *v) | |
658 | { | |
659 | struct blk_mq_hw_ctx *hctx = m->private; | |
660 | ||
661 | seq_printf(m, "%lu\n", hctx->run); | |
662 | return 0; | |
663 | } | |
664 | ||
665 | static int hctx_run_open(struct inode *inode, struct file *file) | |
666 | { | |
667 | return single_open(file, hctx_run_show, inode->i_private); | |
668 | } | |
669 | ||
670 | static ssize_t hctx_run_write(struct file *file, const char __user *buf, | |
671 | size_t count, loff_t *ppos) | |
672 | { | |
673 | struct seq_file *m = file->private_data; | |
674 | struct blk_mq_hw_ctx *hctx = m->private; | |
675 | ||
676 | hctx->run = 0; | |
677 | return count; | |
678 | } | |
679 | ||
680 | static const struct file_operations hctx_run_fops = { | |
681 | .open = hctx_run_open, | |
682 | .read = seq_read, | |
683 | .write = hctx_run_write, | |
684 | .llseek = seq_lseek, | |
685 | .release = single_release, | |
686 | }; | |
687 | ||
688 | static int hctx_active_show(struct seq_file *m, void *v) | |
689 | { | |
690 | struct blk_mq_hw_ctx *hctx = m->private; | |
691 | ||
692 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static int hctx_active_open(struct inode *inode, struct file *file) | |
697 | { | |
698 | return single_open(file, hctx_active_show, inode->i_private); | |
699 | } | |
700 | ||
701 | static const struct file_operations hctx_active_fops = { | |
702 | .open = hctx_active_open, | |
703 | .read = seq_read, | |
704 | .llseek = seq_lseek, | |
705 | .release = single_release, | |
706 | }; | |
707 | ||
950cd7e9 | 708 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 709 | __acquires(&ctx->lock) |
950cd7e9 OS |
710 | { |
711 | struct blk_mq_ctx *ctx = m->private; | |
712 | ||
713 | spin_lock(&ctx->lock); | |
714 | return seq_list_start(&ctx->rq_list, *pos); | |
715 | } | |
716 | ||
717 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
718 | { | |
719 | struct blk_mq_ctx *ctx = m->private; | |
720 | ||
721 | return seq_list_next(v, &ctx->rq_list, pos); | |
722 | } | |
723 | ||
724 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 725 | __releases(&ctx->lock) |
950cd7e9 OS |
726 | { |
727 | struct blk_mq_ctx *ctx = m->private; | |
728 | ||
729 | spin_unlock(&ctx->lock); | |
730 | } | |
731 | ||
732 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
733 | .start = ctx_rq_list_start, | |
734 | .next = ctx_rq_list_next, | |
735 | .stop = ctx_rq_list_stop, | |
736 | .show = blk_mq_debugfs_rq_show, | |
737 | }; | |
738 | ||
739 | static int ctx_rq_list_open(struct inode *inode, struct file *file) | |
740 | { | |
741 | return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); | |
742 | } | |
743 | ||
744 | static const struct file_operations ctx_rq_list_fops = { | |
745 | .open = ctx_rq_list_open, | |
746 | .read = seq_read, | |
747 | .llseek = seq_lseek, | |
748 | .release = seq_release, | |
749 | }; | |
750 | ||
4a46f05e OS |
751 | static int ctx_dispatched_show(struct seq_file *m, void *v) |
752 | { | |
753 | struct blk_mq_ctx *ctx = m->private; | |
754 | ||
755 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
756 | return 0; | |
757 | } | |
758 | ||
759 | static int ctx_dispatched_open(struct inode *inode, struct file *file) | |
760 | { | |
761 | return single_open(file, ctx_dispatched_show, inode->i_private); | |
762 | } | |
763 | ||
764 | static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, | |
765 | size_t count, loff_t *ppos) | |
766 | { | |
767 | struct seq_file *m = file->private_data; | |
768 | struct blk_mq_ctx *ctx = m->private; | |
769 | ||
770 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
771 | return count; | |
772 | } | |
773 | ||
774 | static const struct file_operations ctx_dispatched_fops = { | |
775 | .open = ctx_dispatched_open, | |
776 | .read = seq_read, | |
777 | .write = ctx_dispatched_write, | |
778 | .llseek = seq_lseek, | |
779 | .release = single_release, | |
780 | }; | |
781 | ||
782 | static int ctx_merged_show(struct seq_file *m, void *v) | |
783 | { | |
784 | struct blk_mq_ctx *ctx = m->private; | |
785 | ||
786 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
787 | return 0; | |
788 | } | |
789 | ||
790 | static int ctx_merged_open(struct inode *inode, struct file *file) | |
791 | { | |
792 | return single_open(file, ctx_merged_show, inode->i_private); | |
793 | } | |
794 | ||
795 | static ssize_t ctx_merged_write(struct file *file, const char __user *buf, | |
796 | size_t count, loff_t *ppos) | |
797 | { | |
798 | struct seq_file *m = file->private_data; | |
799 | struct blk_mq_ctx *ctx = m->private; | |
800 | ||
801 | ctx->rq_merged = 0; | |
802 | return count; | |
803 | } | |
804 | ||
805 | static const struct file_operations ctx_merged_fops = { | |
806 | .open = ctx_merged_open, | |
807 | .read = seq_read, | |
808 | .write = ctx_merged_write, | |
809 | .llseek = seq_lseek, | |
810 | .release = single_release, | |
811 | }; | |
812 | ||
813 | static int ctx_completed_show(struct seq_file *m, void *v) | |
814 | { | |
815 | struct blk_mq_ctx *ctx = m->private; | |
816 | ||
817 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | static int ctx_completed_open(struct inode *inode, struct file *file) | |
822 | { | |
823 | return single_open(file, ctx_completed_show, inode->i_private); | |
824 | } | |
825 | ||
826 | static ssize_t ctx_completed_write(struct file *file, const char __user *buf, | |
827 | size_t count, loff_t *ppos) | |
828 | { | |
829 | struct seq_file *m = file->private_data; | |
830 | struct blk_mq_ctx *ctx = m->private; | |
831 | ||
832 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
833 | return count; | |
834 | } | |
835 | ||
836 | static const struct file_operations ctx_completed_fops = { | |
837 | .open = ctx_completed_open, | |
838 | .read = seq_read, | |
839 | .write = ctx_completed_write, | |
840 | .llseek = seq_lseek, | |
841 | .release = single_release, | |
842 | }; | |
843 | ||
34dbad5d OS |
844 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
845 | {"poll_stat", 0400, &queue_poll_stat_fops}, | |
65ca1ca3 | 846 | {"state", 0600, &blk_queue_flags_fops}, |
34dbad5d OS |
847 | {}, |
848 | }; | |
849 | ||
07e4fead | 850 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
9abb2ad2 OS |
851 | {"state", 0400, &hctx_state_fops}, |
852 | {"flags", 0400, &hctx_flags_fops}, | |
950cd7e9 | 853 | {"dispatch", 0400, &hctx_dispatch_fops}, |
0bfa5288 | 854 | {"ctx_map", 0400, &hctx_ctx_map_fops}, |
d96b37c0 | 855 | {"tags", 0400, &hctx_tags_fops}, |
d7e3621a | 856 | {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, |
d96b37c0 | 857 | {"sched_tags", 0400, &hctx_sched_tags_fops}, |
d7e3621a | 858 | {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, |
be215473 | 859 | {"io_poll", 0600, &hctx_io_poll_fops}, |
be215473 | 860 | {"dispatched", 0600, &hctx_dispatched_fops}, |
4a46f05e OS |
861 | {"queued", 0600, &hctx_queued_fops}, |
862 | {"run", 0600, &hctx_run_fops}, | |
863 | {"active", 0400, &hctx_active_fops}, | |
72f2f8f6 | 864 | {}, |
07e4fead OS |
865 | }; |
866 | ||
867 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
950cd7e9 | 868 | {"rq_list", 0400, &ctx_rq_list_fops}, |
4a46f05e OS |
869 | {"dispatched", 0600, &ctx_dispatched_fops}, |
870 | {"merged", 0600, &ctx_merged_fops}, | |
871 | {"completed", 0600, &ctx_completed_fops}, | |
72f2f8f6 | 872 | {}, |
07e4fead OS |
873 | }; |
874 | ||
4c9e4019 | 875 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 876 | { |
18fbda91 | 877 | if (!blk_debugfs_root) |
07e4fead OS |
878 | return -ENOENT; |
879 | ||
4c9e4019 BVA |
880 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
881 | blk_debugfs_root); | |
07e4fead OS |
882 | if (!q->debugfs_dir) |
883 | goto err; | |
884 | ||
62d6c949 | 885 | if (blk_mq_debugfs_register_mq(q)) |
07e4fead OS |
886 | goto err; |
887 | ||
888 | return 0; | |
889 | ||
890 | err: | |
891 | blk_mq_debugfs_unregister(q); | |
892 | return -ENOMEM; | |
893 | } | |
894 | ||
895 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
896 | { | |
897 | debugfs_remove_recursive(q->debugfs_dir); | |
898 | q->mq_debugfs_dir = NULL; | |
899 | q->debugfs_dir = NULL; | |
900 | } | |
901 | ||
72f2f8f6 BVA |
902 | static bool debugfs_create_files(struct dentry *parent, void *data, |
903 | const struct blk_mq_debugfs_attr *attr) | |
904 | { | |
905 | for (; attr->name; attr++) { | |
906 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
907 | data, attr->fops)) | |
908 | return false; | |
909 | } | |
910 | return true; | |
911 | } | |
912 | ||
07e4fead OS |
913 | static int blk_mq_debugfs_register_ctx(struct request_queue *q, |
914 | struct blk_mq_ctx *ctx, | |
915 | struct dentry *hctx_dir) | |
916 | { | |
917 | struct dentry *ctx_dir; | |
918 | char name[20]; | |
07e4fead OS |
919 | |
920 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
921 | ctx_dir = debugfs_create_dir(name, hctx_dir); | |
922 | if (!ctx_dir) | |
923 | return -ENOMEM; | |
924 | ||
72f2f8f6 BVA |
925 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
926 | return -ENOMEM; | |
07e4fead OS |
927 | |
928 | return 0; | |
929 | } | |
930 | ||
931 | static int blk_mq_debugfs_register_hctx(struct request_queue *q, | |
932 | struct blk_mq_hw_ctx *hctx) | |
933 | { | |
934 | struct blk_mq_ctx *ctx; | |
935 | struct dentry *hctx_dir; | |
936 | char name[20]; | |
937 | int i; | |
938 | ||
939 | snprintf(name, sizeof(name), "%u", hctx->queue_num); | |
940 | hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); | |
941 | if (!hctx_dir) | |
942 | return -ENOMEM; | |
943 | ||
72f2f8f6 BVA |
944 | if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) |
945 | return -ENOMEM; | |
07e4fead OS |
946 | |
947 | hctx_for_each_ctx(hctx, ctx, i) { | |
948 | if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) | |
949 | return -ENOMEM; | |
950 | } | |
951 | ||
952 | return 0; | |
953 | } | |
954 | ||
62d6c949 | 955 | int blk_mq_debugfs_register_mq(struct request_queue *q) |
07e4fead OS |
956 | { |
957 | struct blk_mq_hw_ctx *hctx; | |
958 | int i; | |
959 | ||
960 | if (!q->debugfs_dir) | |
961 | return -ENOENT; | |
962 | ||
963 | q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); | |
964 | if (!q->mq_debugfs_dir) | |
965 | goto err; | |
966 | ||
34dbad5d OS |
967 | if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs)) |
968 | goto err; | |
969 | ||
07e4fead OS |
970 | queue_for_each_hw_ctx(q, hctx, i) { |
971 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
972 | goto err; | |
973 | } | |
974 | ||
975 | return 0; | |
976 | ||
977 | err: | |
62d6c949 | 978 | blk_mq_debugfs_unregister_mq(q); |
07e4fead OS |
979 | return -ENOMEM; |
980 | } | |
981 | ||
62d6c949 | 982 | void blk_mq_debugfs_unregister_mq(struct request_queue *q) |
07e4fead OS |
983 | { |
984 | debugfs_remove_recursive(q->mq_debugfs_dir); | |
985 | q->mq_debugfs_dir = NULL; | |
986 | } |