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Commit | Line | Data |
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07e4fead OS |
1 | /* |
2 | * Copyright (C) 2017 Facebook | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/debugfs.h> | |
20 | ||
21 | #include <linux/blk-mq.h> | |
18fbda91 | 22 | #include "blk.h" |
07e4fead | 23 | #include "blk-mq.h" |
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; | |
114 | char op[16] = { }, *s; | |
115 | ||
c7e4145a OS |
116 | if (count >= sizeof(op)) { |
117 | pr_err("%s: operation too long\n", __func__); | |
118 | goto inval; | |
119 | } | |
120 | ||
121 | if (copy_from_user(op, buf, count)) | |
91d68905 BVA |
122 | return -EFAULT; |
123 | s = op; | |
124 | strsep(&s, " \t\n"); /* strip trailing whitespace */ | |
125 | if (strcmp(op, "run") == 0) { | |
126 | blk_mq_run_hw_queues(q, true); | |
127 | } else if (strcmp(op, "start") == 0) { | |
128 | blk_mq_start_stopped_hw_queues(q, true); | |
129 | } else { | |
c7e4145a OS |
130 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
131 | inval: | |
132 | pr_err("%s: use either 'run' or 'start'\n", __func__); | |
91d68905 BVA |
133 | return -EINVAL; |
134 | } | |
c7e4145a | 135 | return count; |
91d68905 BVA |
136 | } |
137 | ||
138 | static int blk_queue_flags_open(struct inode *inode, struct file *file) | |
139 | { | |
140 | return single_open(file, blk_queue_flags_show, inode->i_private); | |
141 | } | |
142 | ||
143 | static const struct file_operations blk_queue_flags_fops = { | |
144 | .open = blk_queue_flags_open, | |
145 | .read = seq_read, | |
146 | .llseek = seq_lseek, | |
147 | .release = single_release, | |
148 | .write = blk_queue_flags_store, | |
149 | }; | |
150 | ||
34dbad5d OS |
151 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
152 | { | |
153 | if (stat->nr_samples) { | |
154 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
155 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
156 | } else { | |
157 | seq_puts(m, "samples=0"); | |
158 | } | |
159 | } | |
160 | ||
161 | static int queue_poll_stat_show(struct seq_file *m, void *v) | |
162 | { | |
163 | struct request_queue *q = m->private; | |
0206319f | 164 | int bucket; |
34dbad5d | 165 | |
0206319f SB |
166 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
167 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
168 | print_stat(m, &q->poll_stat[2*bucket]); | |
169 | seq_puts(m, "\n"); | |
34dbad5d | 170 | |
0206319f SB |
171 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
172 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
173 | seq_puts(m, "\n"); | |
174 | } | |
34dbad5d OS |
175 | return 0; |
176 | } | |
177 | ||
178 | static int queue_poll_stat_open(struct inode *inode, struct file *file) | |
179 | { | |
180 | return single_open(file, queue_poll_stat_show, inode->i_private); | |
181 | } | |
182 | ||
183 | static const struct file_operations queue_poll_stat_fops = { | |
184 | .open = queue_poll_stat_open, | |
185 | .read = seq_read, | |
186 | .llseek = seq_lseek, | |
187 | .release = single_release, | |
188 | }; | |
189 | ||
1a435111 | 190 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 191 | static const char *const hctx_state_name[] = { |
1a435111 OS |
192 | HCTX_STATE_NAME(STOPPED), |
193 | HCTX_STATE_NAME(TAG_ACTIVE), | |
194 | HCTX_STATE_NAME(SCHED_RESTART), | |
195 | HCTX_STATE_NAME(TAG_WAITING), | |
196 | HCTX_STATE_NAME(START_ON_RUN), | |
f5c0b091 | 197 | }; |
1a435111 OS |
198 | #undef HCTX_STATE_NAME |
199 | ||
9abb2ad2 OS |
200 | static int hctx_state_show(struct seq_file *m, void *v) |
201 | { | |
202 | struct blk_mq_hw_ctx *hctx = m->private; | |
203 | ||
f5c0b091 BVA |
204 | blk_flags_show(m, hctx->state, hctx_state_name, |
205 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 206 | seq_puts(m, "\n"); |
9abb2ad2 OS |
207 | return 0; |
208 | } | |
209 | ||
210 | static int hctx_state_open(struct inode *inode, struct file *file) | |
211 | { | |
212 | return single_open(file, hctx_state_show, inode->i_private); | |
213 | } | |
214 | ||
215 | static const struct file_operations hctx_state_fops = { | |
216 | .open = hctx_state_open, | |
217 | .read = seq_read, | |
218 | .llseek = seq_lseek, | |
219 | .release = single_release, | |
220 | }; | |
221 | ||
1a435111 | 222 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 223 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
224 | BLK_TAG_ALLOC_NAME(FIFO), |
225 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 226 | }; |
1a435111 | 227 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 228 | |
1a435111 | 229 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 230 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
231 | HCTX_FLAG_NAME(SHOULD_MERGE), |
232 | HCTX_FLAG_NAME(TAG_SHARED), | |
233 | HCTX_FLAG_NAME(SG_MERGE), | |
234 | HCTX_FLAG_NAME(BLOCKING), | |
235 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 236 | }; |
1a435111 | 237 | #undef HCTX_FLAG_NAME |
f5c0b091 | 238 | |
9abb2ad2 OS |
239 | static int hctx_flags_show(struct seq_file *m, void *v) |
240 | { | |
241 | struct blk_mq_hw_ctx *hctx = m->private; | |
f5c0b091 | 242 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 243 | |
f5c0b091 BVA |
244 | seq_puts(m, "alloc_policy="); |
245 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
246 | alloc_policy_name[alloc_policy]) | |
247 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
248 | else | |
249 | seq_printf(m, "%d", alloc_policy); | |
250 | seq_puts(m, " "); | |
251 | blk_flags_show(m, | |
252 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
253 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 254 | seq_puts(m, "\n"); |
9abb2ad2 OS |
255 | return 0; |
256 | } | |
257 | ||
258 | static int hctx_flags_open(struct inode *inode, struct file *file) | |
259 | { | |
260 | return single_open(file, hctx_flags_show, inode->i_private); | |
261 | } | |
262 | ||
263 | static const struct file_operations hctx_flags_fops = { | |
264 | .open = hctx_flags_open, | |
265 | .read = seq_read, | |
266 | .llseek = seq_lseek, | |
267 | .release = single_release, | |
268 | }; | |
269 | ||
1a435111 | 270 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 271 | static const char *const op_name[] = { |
1a435111 OS |
272 | REQ_OP_NAME(READ), |
273 | REQ_OP_NAME(WRITE), | |
274 | REQ_OP_NAME(FLUSH), | |
275 | REQ_OP_NAME(DISCARD), | |
276 | REQ_OP_NAME(ZONE_REPORT), | |
277 | REQ_OP_NAME(SECURE_ERASE), | |
278 | REQ_OP_NAME(ZONE_RESET), | |
279 | REQ_OP_NAME(WRITE_SAME), | |
280 | REQ_OP_NAME(WRITE_ZEROES), | |
281 | REQ_OP_NAME(SCSI_IN), | |
282 | REQ_OP_NAME(SCSI_OUT), | |
283 | REQ_OP_NAME(DRV_IN), | |
284 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 285 | }; |
1a435111 | 286 | #undef REQ_OP_NAME |
8658dca8 | 287 | |
1a435111 | 288 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 289 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
290 | CMD_FLAG_NAME(FAILFAST_DEV), |
291 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
292 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
293 | CMD_FLAG_NAME(SYNC), | |
294 | CMD_FLAG_NAME(META), | |
295 | CMD_FLAG_NAME(PRIO), | |
296 | CMD_FLAG_NAME(NOMERGE), | |
297 | CMD_FLAG_NAME(IDLE), | |
298 | CMD_FLAG_NAME(INTEGRITY), | |
299 | CMD_FLAG_NAME(FUA), | |
300 | CMD_FLAG_NAME(PREFLUSH), | |
301 | CMD_FLAG_NAME(RAHEAD), | |
302 | CMD_FLAG_NAME(BACKGROUND), | |
303 | CMD_FLAG_NAME(NOUNMAP), | |
8658dca8 | 304 | }; |
1a435111 | 305 | #undef CMD_FLAG_NAME |
8658dca8 | 306 | |
1a435111 | 307 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 308 | static const char *const rqf_name[] = { |
1a435111 OS |
309 | RQF_NAME(SORTED), |
310 | RQF_NAME(STARTED), | |
311 | RQF_NAME(QUEUED), | |
312 | RQF_NAME(SOFTBARRIER), | |
313 | RQF_NAME(FLUSH_SEQ), | |
314 | RQF_NAME(MIXED_MERGE), | |
315 | RQF_NAME(MQ_INFLIGHT), | |
316 | RQF_NAME(DONTPREP), | |
317 | RQF_NAME(PREEMPT), | |
318 | RQF_NAME(COPY_USER), | |
319 | RQF_NAME(FAILED), | |
320 | RQF_NAME(QUIET), | |
321 | RQF_NAME(ELVPRIV), | |
322 | RQF_NAME(IO_STAT), | |
323 | RQF_NAME(ALLOCED), | |
324 | RQF_NAME(PM), | |
325 | RQF_NAME(HASHED), | |
326 | RQF_NAME(STATS), | |
327 | RQF_NAME(SPECIAL_PAYLOAD), | |
8658dca8 | 328 | }; |
1a435111 | 329 | #undef RQF_NAME |
8658dca8 | 330 | |
950cd7e9 OS |
331 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
332 | { | |
333 | struct request *rq = list_entry_rq(v); | |
2836ee4b | 334 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 335 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 336 | |
8658dca8 BVA |
337 | seq_printf(m, "%p {.op=", rq); |
338 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
339 | seq_printf(m, "%s", op_name[op]); | |
340 | else | |
341 | seq_printf(m, "%d", op); | |
342 | seq_puts(m, ", .cmd_flags="); | |
343 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
344 | ARRAY_SIZE(cmd_flag_name)); | |
345 | seq_puts(m, ", .rq_flags="); | |
346 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
347 | ARRAY_SIZE(rqf_name)); | |
2836ee4b | 348 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 349 | rq->internal_tag); |
2836ee4b BVA |
350 | if (mq_ops->show_rq) |
351 | mq_ops->show_rq(m, rq); | |
352 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
353 | return 0; |
354 | } | |
355 | ||
356 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 357 | __acquires(&hctx->lock) |
950cd7e9 OS |
358 | { |
359 | struct blk_mq_hw_ctx *hctx = m->private; | |
360 | ||
361 | spin_lock(&hctx->lock); | |
362 | return seq_list_start(&hctx->dispatch, *pos); | |
363 | } | |
364 | ||
365 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
366 | { | |
367 | struct blk_mq_hw_ctx *hctx = m->private; | |
368 | ||
369 | return seq_list_next(v, &hctx->dispatch, pos); | |
370 | } | |
371 | ||
372 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 373 | __releases(&hctx->lock) |
950cd7e9 OS |
374 | { |
375 | struct blk_mq_hw_ctx *hctx = m->private; | |
376 | ||
377 | spin_unlock(&hctx->lock); | |
378 | } | |
379 | ||
380 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
381 | .start = hctx_dispatch_start, | |
382 | .next = hctx_dispatch_next, | |
383 | .stop = hctx_dispatch_stop, | |
384 | .show = blk_mq_debugfs_rq_show, | |
385 | }; | |
386 | ||
387 | static int hctx_dispatch_open(struct inode *inode, struct file *file) | |
388 | { | |
389 | return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); | |
390 | } | |
391 | ||
392 | static const struct file_operations hctx_dispatch_fops = { | |
393 | .open = hctx_dispatch_open, | |
394 | .read = seq_read, | |
395 | .llseek = seq_lseek, | |
396 | .release = seq_release, | |
397 | }; | |
398 | ||
0bfa5288 OS |
399 | static int hctx_ctx_map_show(struct seq_file *m, void *v) |
400 | { | |
401 | struct blk_mq_hw_ctx *hctx = m->private; | |
402 | ||
403 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
404 | return 0; | |
405 | } | |
406 | ||
407 | static int hctx_ctx_map_open(struct inode *inode, struct file *file) | |
408 | { | |
409 | return single_open(file, hctx_ctx_map_show, inode->i_private); | |
410 | } | |
411 | ||
412 | static const struct file_operations hctx_ctx_map_fops = { | |
413 | .open = hctx_ctx_map_open, | |
414 | .read = seq_read, | |
415 | .llseek = seq_lseek, | |
416 | .release = single_release, | |
417 | }; | |
418 | ||
d96b37c0 OS |
419 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
420 | struct blk_mq_tags *tags) | |
421 | { | |
422 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
423 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
424 | seq_printf(m, "active_queues=%d\n", | |
425 | atomic_read(&tags->active_queues)); | |
426 | ||
427 | seq_puts(m, "\nbitmap_tags:\n"); | |
428 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
429 | ||
430 | if (tags->nr_reserved_tags) { | |
431 | seq_puts(m, "\nbreserved_tags:\n"); | |
432 | sbitmap_queue_show(&tags->breserved_tags, m); | |
433 | } | |
434 | } | |
435 | ||
436 | static int hctx_tags_show(struct seq_file *m, void *v) | |
437 | { | |
438 | struct blk_mq_hw_ctx *hctx = m->private; | |
439 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 440 | int res; |
d96b37c0 | 441 | |
8c0f14ea BVA |
442 | res = mutex_lock_interruptible(&q->sysfs_lock); |
443 | if (res) | |
444 | goto out; | |
d96b37c0 OS |
445 | if (hctx->tags) |
446 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
447 | mutex_unlock(&q->sysfs_lock); | |
448 | ||
8c0f14ea BVA |
449 | out: |
450 | return res; | |
d96b37c0 OS |
451 | } |
452 | ||
453 | static int hctx_tags_open(struct inode *inode, struct file *file) | |
454 | { | |
455 | return single_open(file, hctx_tags_show, inode->i_private); | |
456 | } | |
457 | ||
458 | static const struct file_operations hctx_tags_fops = { | |
459 | .open = hctx_tags_open, | |
460 | .read = seq_read, | |
461 | .llseek = seq_lseek, | |
462 | .release = single_release, | |
463 | }; | |
464 | ||
d7e3621a OS |
465 | static int hctx_tags_bitmap_show(struct seq_file *m, void *v) |
466 | { | |
467 | struct blk_mq_hw_ctx *hctx = m->private; | |
468 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 469 | int res; |
d7e3621a | 470 | |
8c0f14ea BVA |
471 | res = mutex_lock_interruptible(&q->sysfs_lock); |
472 | if (res) | |
473 | goto out; | |
d7e3621a OS |
474 | if (hctx->tags) |
475 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
476 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
477 | |
478 | out: | |
479 | return res; | |
d7e3621a OS |
480 | } |
481 | ||
482 | static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) | |
483 | { | |
484 | return single_open(file, hctx_tags_bitmap_show, inode->i_private); | |
485 | } | |
486 | ||
487 | static const struct file_operations hctx_tags_bitmap_fops = { | |
488 | .open = hctx_tags_bitmap_open, | |
489 | .read = seq_read, | |
490 | .llseek = seq_lseek, | |
491 | .release = single_release, | |
492 | }; | |
493 | ||
d96b37c0 OS |
494 | static int hctx_sched_tags_show(struct seq_file *m, void *v) |
495 | { | |
496 | struct blk_mq_hw_ctx *hctx = m->private; | |
497 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 498 | int res; |
d96b37c0 | 499 | |
8c0f14ea BVA |
500 | res = mutex_lock_interruptible(&q->sysfs_lock); |
501 | if (res) | |
502 | goto out; | |
d96b37c0 OS |
503 | if (hctx->sched_tags) |
504 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
505 | mutex_unlock(&q->sysfs_lock); | |
506 | ||
8c0f14ea BVA |
507 | out: |
508 | return res; | |
d96b37c0 OS |
509 | } |
510 | ||
511 | static int hctx_sched_tags_open(struct inode *inode, struct file *file) | |
512 | { | |
513 | return single_open(file, hctx_sched_tags_show, inode->i_private); | |
514 | } | |
515 | ||
516 | static const struct file_operations hctx_sched_tags_fops = { | |
517 | .open = hctx_sched_tags_open, | |
518 | .read = seq_read, | |
519 | .llseek = seq_lseek, | |
520 | .release = single_release, | |
521 | }; | |
522 | ||
d7e3621a OS |
523 | static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) |
524 | { | |
525 | struct blk_mq_hw_ctx *hctx = m->private; | |
526 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 527 | int res; |
d7e3621a | 528 | |
8c0f14ea BVA |
529 | res = mutex_lock_interruptible(&q->sysfs_lock); |
530 | if (res) | |
531 | goto out; | |
d7e3621a OS |
532 | if (hctx->sched_tags) |
533 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
534 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
535 | |
536 | out: | |
537 | return res; | |
d7e3621a OS |
538 | } |
539 | ||
540 | static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) | |
541 | { | |
542 | return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); | |
543 | } | |
544 | ||
545 | static const struct file_operations hctx_sched_tags_bitmap_fops = { | |
546 | .open = hctx_sched_tags_bitmap_open, | |
547 | .read = seq_read, | |
548 | .llseek = seq_lseek, | |
549 | .release = single_release, | |
550 | }; | |
551 | ||
be215473 OS |
552 | static int hctx_io_poll_show(struct seq_file *m, void *v) |
553 | { | |
554 | struct blk_mq_hw_ctx *hctx = m->private; | |
555 | ||
556 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
557 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
558 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static int hctx_io_poll_open(struct inode *inode, struct file *file) | |
563 | { | |
564 | return single_open(file, hctx_io_poll_show, inode->i_private); | |
565 | } | |
566 | ||
567 | static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, | |
568 | size_t count, loff_t *ppos) | |
569 | { | |
570 | struct seq_file *m = file->private_data; | |
571 | struct blk_mq_hw_ctx *hctx = m->private; | |
572 | ||
573 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
574 | return count; | |
575 | } | |
576 | ||
577 | static const struct file_operations hctx_io_poll_fops = { | |
578 | .open = hctx_io_poll_open, | |
579 | .read = seq_read, | |
580 | .write = hctx_io_poll_write, | |
581 | .llseek = seq_lseek, | |
582 | .release = single_release, | |
583 | }; | |
584 | ||
be215473 OS |
585 | static int hctx_dispatched_show(struct seq_file *m, void *v) |
586 | { | |
587 | struct blk_mq_hw_ctx *hctx = m->private; | |
588 | int i; | |
589 | ||
590 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
591 | ||
592 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
593 | unsigned int d = 1U << (i - 1); | |
594 | ||
595 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
596 | } | |
597 | ||
598 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
599 | return 0; | |
600 | } | |
601 | ||
602 | static int hctx_dispatched_open(struct inode *inode, struct file *file) | |
603 | { | |
604 | return single_open(file, hctx_dispatched_show, inode->i_private); | |
605 | } | |
606 | ||
607 | static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, | |
608 | size_t count, loff_t *ppos) | |
609 | { | |
610 | struct seq_file *m = file->private_data; | |
611 | struct blk_mq_hw_ctx *hctx = m->private; | |
612 | int i; | |
613 | ||
614 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
615 | hctx->dispatched[i] = 0; | |
616 | return count; | |
617 | } | |
618 | ||
619 | static const struct file_operations hctx_dispatched_fops = { | |
620 | .open = hctx_dispatched_open, | |
621 | .read = seq_read, | |
622 | .write = hctx_dispatched_write, | |
623 | .llseek = seq_lseek, | |
624 | .release = single_release, | |
625 | }; | |
626 | ||
4a46f05e OS |
627 | static int hctx_queued_show(struct seq_file *m, void *v) |
628 | { | |
629 | struct blk_mq_hw_ctx *hctx = m->private; | |
630 | ||
631 | seq_printf(m, "%lu\n", hctx->queued); | |
632 | return 0; | |
633 | } | |
634 | ||
635 | static int hctx_queued_open(struct inode *inode, struct file *file) | |
636 | { | |
637 | return single_open(file, hctx_queued_show, inode->i_private); | |
638 | } | |
639 | ||
640 | static ssize_t hctx_queued_write(struct file *file, const char __user *buf, | |
641 | size_t count, loff_t *ppos) | |
642 | { | |
643 | struct seq_file *m = file->private_data; | |
644 | struct blk_mq_hw_ctx *hctx = m->private; | |
645 | ||
646 | hctx->queued = 0; | |
647 | return count; | |
648 | } | |
649 | ||
650 | static const struct file_operations hctx_queued_fops = { | |
651 | .open = hctx_queued_open, | |
652 | .read = seq_read, | |
653 | .write = hctx_queued_write, | |
654 | .llseek = seq_lseek, | |
655 | .release = single_release, | |
656 | }; | |
657 | ||
658 | static int hctx_run_show(struct seq_file *m, void *v) | |
659 | { | |
660 | struct blk_mq_hw_ctx *hctx = m->private; | |
661 | ||
662 | seq_printf(m, "%lu\n", hctx->run); | |
663 | return 0; | |
664 | } | |
665 | ||
666 | static int hctx_run_open(struct inode *inode, struct file *file) | |
667 | { | |
668 | return single_open(file, hctx_run_show, inode->i_private); | |
669 | } | |
670 | ||
671 | static ssize_t hctx_run_write(struct file *file, const char __user *buf, | |
672 | size_t count, loff_t *ppos) | |
673 | { | |
674 | struct seq_file *m = file->private_data; | |
675 | struct blk_mq_hw_ctx *hctx = m->private; | |
676 | ||
677 | hctx->run = 0; | |
678 | return count; | |
679 | } | |
680 | ||
681 | static const struct file_operations hctx_run_fops = { | |
682 | .open = hctx_run_open, | |
683 | .read = seq_read, | |
684 | .write = hctx_run_write, | |
685 | .llseek = seq_lseek, | |
686 | .release = single_release, | |
687 | }; | |
688 | ||
689 | static int hctx_active_show(struct seq_file *m, void *v) | |
690 | { | |
691 | struct blk_mq_hw_ctx *hctx = m->private; | |
692 | ||
693 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
694 | return 0; | |
695 | } | |
696 | ||
697 | static int hctx_active_open(struct inode *inode, struct file *file) | |
698 | { | |
699 | return single_open(file, hctx_active_show, inode->i_private); | |
700 | } | |
701 | ||
702 | static const struct file_operations hctx_active_fops = { | |
703 | .open = hctx_active_open, | |
704 | .read = seq_read, | |
705 | .llseek = seq_lseek, | |
706 | .release = single_release, | |
707 | }; | |
708 | ||
950cd7e9 | 709 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 710 | __acquires(&ctx->lock) |
950cd7e9 OS |
711 | { |
712 | struct blk_mq_ctx *ctx = m->private; | |
713 | ||
714 | spin_lock(&ctx->lock); | |
715 | return seq_list_start(&ctx->rq_list, *pos); | |
716 | } | |
717 | ||
718 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
719 | { | |
720 | struct blk_mq_ctx *ctx = m->private; | |
721 | ||
722 | return seq_list_next(v, &ctx->rq_list, pos); | |
723 | } | |
724 | ||
725 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 726 | __releases(&ctx->lock) |
950cd7e9 OS |
727 | { |
728 | struct blk_mq_ctx *ctx = m->private; | |
729 | ||
730 | spin_unlock(&ctx->lock); | |
731 | } | |
732 | ||
733 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
734 | .start = ctx_rq_list_start, | |
735 | .next = ctx_rq_list_next, | |
736 | .stop = ctx_rq_list_stop, | |
737 | .show = blk_mq_debugfs_rq_show, | |
738 | }; | |
739 | ||
740 | static int ctx_rq_list_open(struct inode *inode, struct file *file) | |
741 | { | |
742 | return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); | |
743 | } | |
744 | ||
745 | static const struct file_operations ctx_rq_list_fops = { | |
746 | .open = ctx_rq_list_open, | |
747 | .read = seq_read, | |
748 | .llseek = seq_lseek, | |
749 | .release = seq_release, | |
750 | }; | |
751 | ||
4a46f05e OS |
752 | static int ctx_dispatched_show(struct seq_file *m, void *v) |
753 | { | |
754 | struct blk_mq_ctx *ctx = m->private; | |
755 | ||
756 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
757 | return 0; | |
758 | } | |
759 | ||
760 | static int ctx_dispatched_open(struct inode *inode, struct file *file) | |
761 | { | |
762 | return single_open(file, ctx_dispatched_show, inode->i_private); | |
763 | } | |
764 | ||
765 | static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, | |
766 | size_t count, loff_t *ppos) | |
767 | { | |
768 | struct seq_file *m = file->private_data; | |
769 | struct blk_mq_ctx *ctx = m->private; | |
770 | ||
771 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
772 | return count; | |
773 | } | |
774 | ||
775 | static const struct file_operations ctx_dispatched_fops = { | |
776 | .open = ctx_dispatched_open, | |
777 | .read = seq_read, | |
778 | .write = ctx_dispatched_write, | |
779 | .llseek = seq_lseek, | |
780 | .release = single_release, | |
781 | }; | |
782 | ||
783 | static int ctx_merged_show(struct seq_file *m, void *v) | |
784 | { | |
785 | struct blk_mq_ctx *ctx = m->private; | |
786 | ||
787 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
788 | return 0; | |
789 | } | |
790 | ||
791 | static int ctx_merged_open(struct inode *inode, struct file *file) | |
792 | { | |
793 | return single_open(file, ctx_merged_show, inode->i_private); | |
794 | } | |
795 | ||
796 | static ssize_t ctx_merged_write(struct file *file, const char __user *buf, | |
797 | size_t count, loff_t *ppos) | |
798 | { | |
799 | struct seq_file *m = file->private_data; | |
800 | struct blk_mq_ctx *ctx = m->private; | |
801 | ||
802 | ctx->rq_merged = 0; | |
803 | return count; | |
804 | } | |
805 | ||
806 | static const struct file_operations ctx_merged_fops = { | |
807 | .open = ctx_merged_open, | |
808 | .read = seq_read, | |
809 | .write = ctx_merged_write, | |
810 | .llseek = seq_lseek, | |
811 | .release = single_release, | |
812 | }; | |
813 | ||
814 | static int ctx_completed_show(struct seq_file *m, void *v) | |
815 | { | |
816 | struct blk_mq_ctx *ctx = m->private; | |
817 | ||
818 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static int ctx_completed_open(struct inode *inode, struct file *file) | |
823 | { | |
824 | return single_open(file, ctx_completed_show, inode->i_private); | |
825 | } | |
826 | ||
827 | static ssize_t ctx_completed_write(struct file *file, const char __user *buf, | |
828 | size_t count, loff_t *ppos) | |
829 | { | |
830 | struct seq_file *m = file->private_data; | |
831 | struct blk_mq_ctx *ctx = m->private; | |
832 | ||
833 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
834 | return count; | |
835 | } | |
836 | ||
837 | static const struct file_operations ctx_completed_fops = { | |
838 | .open = ctx_completed_open, | |
839 | .read = seq_read, | |
840 | .write = ctx_completed_write, | |
841 | .llseek = seq_lseek, | |
842 | .release = single_release, | |
843 | }; | |
844 | ||
34dbad5d OS |
845 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
846 | {"poll_stat", 0400, &queue_poll_stat_fops}, | |
65ca1ca3 | 847 | {"state", 0600, &blk_queue_flags_fops}, |
34dbad5d OS |
848 | {}, |
849 | }; | |
850 | ||
07e4fead | 851 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
9abb2ad2 OS |
852 | {"state", 0400, &hctx_state_fops}, |
853 | {"flags", 0400, &hctx_flags_fops}, | |
950cd7e9 | 854 | {"dispatch", 0400, &hctx_dispatch_fops}, |
0bfa5288 | 855 | {"ctx_map", 0400, &hctx_ctx_map_fops}, |
d96b37c0 | 856 | {"tags", 0400, &hctx_tags_fops}, |
d7e3621a | 857 | {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, |
d96b37c0 | 858 | {"sched_tags", 0400, &hctx_sched_tags_fops}, |
d7e3621a | 859 | {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, |
be215473 | 860 | {"io_poll", 0600, &hctx_io_poll_fops}, |
be215473 | 861 | {"dispatched", 0600, &hctx_dispatched_fops}, |
4a46f05e OS |
862 | {"queued", 0600, &hctx_queued_fops}, |
863 | {"run", 0600, &hctx_run_fops}, | |
864 | {"active", 0400, &hctx_active_fops}, | |
72f2f8f6 | 865 | {}, |
07e4fead OS |
866 | }; |
867 | ||
868 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
950cd7e9 | 869 | {"rq_list", 0400, &ctx_rq_list_fops}, |
4a46f05e OS |
870 | {"dispatched", 0600, &ctx_dispatched_fops}, |
871 | {"merged", 0600, &ctx_merged_fops}, | |
872 | {"completed", 0600, &ctx_completed_fops}, | |
72f2f8f6 | 873 | {}, |
07e4fead OS |
874 | }; |
875 | ||
4c9e4019 | 876 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 877 | { |
18fbda91 | 878 | if (!blk_debugfs_root) |
07e4fead OS |
879 | return -ENOENT; |
880 | ||
4c9e4019 BVA |
881 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
882 | blk_debugfs_root); | |
07e4fead OS |
883 | if (!q->debugfs_dir) |
884 | goto err; | |
885 | ||
62d6c949 | 886 | if (blk_mq_debugfs_register_mq(q)) |
07e4fead OS |
887 | goto err; |
888 | ||
889 | return 0; | |
890 | ||
891 | err: | |
892 | blk_mq_debugfs_unregister(q); | |
893 | return -ENOMEM; | |
894 | } | |
895 | ||
896 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
897 | { | |
898 | debugfs_remove_recursive(q->debugfs_dir); | |
899 | q->mq_debugfs_dir = NULL; | |
900 | q->debugfs_dir = NULL; | |
901 | } | |
902 | ||
72f2f8f6 BVA |
903 | static bool debugfs_create_files(struct dentry *parent, void *data, |
904 | const struct blk_mq_debugfs_attr *attr) | |
905 | { | |
906 | for (; attr->name; attr++) { | |
907 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
908 | data, attr->fops)) | |
909 | return false; | |
910 | } | |
911 | return true; | |
912 | } | |
913 | ||
07e4fead OS |
914 | static int blk_mq_debugfs_register_ctx(struct request_queue *q, |
915 | struct blk_mq_ctx *ctx, | |
916 | struct dentry *hctx_dir) | |
917 | { | |
918 | struct dentry *ctx_dir; | |
919 | char name[20]; | |
07e4fead OS |
920 | |
921 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
922 | ctx_dir = debugfs_create_dir(name, hctx_dir); | |
923 | if (!ctx_dir) | |
924 | return -ENOMEM; | |
925 | ||
72f2f8f6 BVA |
926 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
927 | return -ENOMEM; | |
07e4fead OS |
928 | |
929 | return 0; | |
930 | } | |
931 | ||
932 | static int blk_mq_debugfs_register_hctx(struct request_queue *q, | |
933 | struct blk_mq_hw_ctx *hctx) | |
934 | { | |
935 | struct blk_mq_ctx *ctx; | |
936 | struct dentry *hctx_dir; | |
937 | char name[20]; | |
938 | int i; | |
939 | ||
940 | snprintf(name, sizeof(name), "%u", hctx->queue_num); | |
941 | hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); | |
942 | if (!hctx_dir) | |
943 | return -ENOMEM; | |
944 | ||
72f2f8f6 BVA |
945 | if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) |
946 | return -ENOMEM; | |
07e4fead OS |
947 | |
948 | hctx_for_each_ctx(hctx, ctx, i) { | |
949 | if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) | |
950 | return -ENOMEM; | |
951 | } | |
952 | ||
953 | return 0; | |
954 | } | |
955 | ||
62d6c949 | 956 | int blk_mq_debugfs_register_mq(struct request_queue *q) |
07e4fead OS |
957 | { |
958 | struct blk_mq_hw_ctx *hctx; | |
959 | int i; | |
960 | ||
961 | if (!q->debugfs_dir) | |
962 | return -ENOENT; | |
963 | ||
964 | q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); | |
965 | if (!q->mq_debugfs_dir) | |
966 | goto err; | |
967 | ||
34dbad5d OS |
968 | if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs)) |
969 | goto err; | |
970 | ||
07e4fead OS |
971 | queue_for_each_hw_ctx(q, hctx, i) { |
972 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
973 | goto err; | |
974 | } | |
975 | ||
976 | return 0; | |
977 | ||
978 | err: | |
62d6c949 | 979 | blk_mq_debugfs_unregister_mq(q); |
07e4fead OS |
980 | return -ENOMEM; |
981 | } | |
982 | ||
62d6c949 | 983 | void blk_mq_debugfs_unregister_mq(struct request_queue *q) |
07e4fead OS |
984 | { |
985 | debugfs_remove_recursive(q->mq_debugfs_dir); | |
986 | q->mq_debugfs_dir = NULL; | |
987 | } |