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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) | |
56 | seq_puts(m, " "); | |
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 | } | |
63 | seq_puts(m, "\n"); | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static const char *const blk_queue_flag_name[] = { | |
68 | [QUEUE_FLAG_QUEUED] = "QUEUED", | |
69 | [QUEUE_FLAG_STOPPED] = "STOPPED", | |
70 | [QUEUE_FLAG_SYNCFULL] = "SYNCFULL", | |
71 | [QUEUE_FLAG_ASYNCFULL] = "ASYNCFULL", | |
72 | [QUEUE_FLAG_DYING] = "DYING", | |
73 | [QUEUE_FLAG_BYPASS] = "BYPASS", | |
74 | [QUEUE_FLAG_BIDI] = "BIDI", | |
75 | [QUEUE_FLAG_NOMERGES] = "NOMERGES", | |
76 | [QUEUE_FLAG_SAME_COMP] = "SAME_COMP", | |
77 | [QUEUE_FLAG_FAIL_IO] = "FAIL_IO", | |
78 | [QUEUE_FLAG_STACKABLE] = "STACKABLE", | |
79 | [QUEUE_FLAG_NONROT] = "NONROT", | |
80 | [QUEUE_FLAG_IO_STAT] = "IO_STAT", | |
81 | [QUEUE_FLAG_DISCARD] = "DISCARD", | |
82 | [QUEUE_FLAG_NOXMERGES] = "NOXMERGES", | |
83 | [QUEUE_FLAG_ADD_RANDOM] = "ADD_RANDOM", | |
84 | [QUEUE_FLAG_SECERASE] = "SECERASE", | |
85 | [QUEUE_FLAG_SAME_FORCE] = "SAME_FORCE", | |
86 | [QUEUE_FLAG_DEAD] = "DEAD", | |
87 | [QUEUE_FLAG_INIT_DONE] = "INIT_DONE", | |
88 | [QUEUE_FLAG_NO_SG_MERGE] = "NO_SG_MERGE", | |
89 | [QUEUE_FLAG_POLL] = "POLL", | |
90 | [QUEUE_FLAG_WC] = "WC", | |
91 | [QUEUE_FLAG_FUA] = "FUA", | |
92 | [QUEUE_FLAG_FLUSH_NQ] = "FLUSH_NQ", | |
93 | [QUEUE_FLAG_DAX] = "DAX", | |
94 | [QUEUE_FLAG_STATS] = "STATS", | |
95 | [QUEUE_FLAG_POLL_STATS] = "POLL_STATS", | |
96 | [QUEUE_FLAG_REGISTERED] = "REGISTERED", | |
97 | }; | |
98 | ||
99 | static int blk_queue_flags_show(struct seq_file *m, void *v) | |
100 | { | |
101 | struct request_queue *q = m->private; | |
102 | ||
103 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
104 | ARRAY_SIZE(blk_queue_flag_name)); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static ssize_t blk_queue_flags_store(struct file *file, const char __user *ubuf, | |
109 | size_t len, loff_t *offp) | |
110 | { | |
111 | struct request_queue *q = file_inode(file)->i_private; | |
112 | char op[16] = { }, *s; | |
113 | ||
114 | len = min(len, sizeof(op) - 1); | |
115 | if (copy_from_user(op, ubuf, len)) | |
116 | return -EFAULT; | |
117 | s = op; | |
118 | strsep(&s, " \t\n"); /* strip trailing whitespace */ | |
119 | if (strcmp(op, "run") == 0) { | |
120 | blk_mq_run_hw_queues(q, true); | |
121 | } else if (strcmp(op, "start") == 0) { | |
122 | blk_mq_start_stopped_hw_queues(q, true); | |
123 | } else { | |
124 | pr_err("%s: unsupported operation %s. Use either 'run' or 'start'\n", | |
125 | __func__, op); | |
126 | return -EINVAL; | |
127 | } | |
128 | return len; | |
129 | } | |
130 | ||
131 | static int blk_queue_flags_open(struct inode *inode, struct file *file) | |
132 | { | |
133 | return single_open(file, blk_queue_flags_show, inode->i_private); | |
134 | } | |
135 | ||
136 | static const struct file_operations blk_queue_flags_fops = { | |
137 | .open = blk_queue_flags_open, | |
138 | .read = seq_read, | |
139 | .llseek = seq_lseek, | |
140 | .release = single_release, | |
141 | .write = blk_queue_flags_store, | |
142 | }; | |
143 | ||
144 | static const struct blk_mq_debugfs_attr blk_queue_attrs[] = { | |
145 | {"state", 0600, &blk_queue_flags_fops}, | |
146 | {}, | |
147 | }; | |
148 | ||
34dbad5d OS |
149 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
150 | { | |
151 | if (stat->nr_samples) { | |
152 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
153 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
154 | } else { | |
155 | seq_puts(m, "samples=0"); | |
156 | } | |
157 | } | |
158 | ||
159 | static int queue_poll_stat_show(struct seq_file *m, void *v) | |
160 | { | |
161 | struct request_queue *q = m->private; | |
0206319f | 162 | int bucket; |
34dbad5d | 163 | |
0206319f SB |
164 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
165 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
166 | print_stat(m, &q->poll_stat[2*bucket]); | |
167 | seq_puts(m, "\n"); | |
34dbad5d | 168 | |
0206319f SB |
169 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
170 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
171 | seq_puts(m, "\n"); | |
172 | } | |
34dbad5d OS |
173 | return 0; |
174 | } | |
175 | ||
176 | static int queue_poll_stat_open(struct inode *inode, struct file *file) | |
177 | { | |
178 | return single_open(file, queue_poll_stat_show, inode->i_private); | |
179 | } | |
180 | ||
181 | static const struct file_operations queue_poll_stat_fops = { | |
182 | .open = queue_poll_stat_open, | |
183 | .read = seq_read, | |
184 | .llseek = seq_lseek, | |
185 | .release = single_release, | |
186 | }; | |
187 | ||
f5c0b091 BVA |
188 | static const char *const hctx_state_name[] = { |
189 | [BLK_MQ_S_STOPPED] = "STOPPED", | |
190 | [BLK_MQ_S_TAG_ACTIVE] = "TAG_ACTIVE", | |
191 | [BLK_MQ_S_SCHED_RESTART] = "SCHED_RESTART", | |
192 | [BLK_MQ_S_TAG_WAITING] = "TAG_WAITING", | |
193 | ||
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)); | |
9abb2ad2 OS |
201 | return 0; |
202 | } | |
203 | ||
204 | static int hctx_state_open(struct inode *inode, struct file *file) | |
205 | { | |
206 | return single_open(file, hctx_state_show, inode->i_private); | |
207 | } | |
208 | ||
209 | static const struct file_operations hctx_state_fops = { | |
210 | .open = hctx_state_open, | |
211 | .read = seq_read, | |
212 | .llseek = seq_lseek, | |
213 | .release = single_release, | |
214 | }; | |
215 | ||
f5c0b091 BVA |
216 | static const char *const alloc_policy_name[] = { |
217 | [BLK_TAG_ALLOC_FIFO] = "fifo", | |
218 | [BLK_TAG_ALLOC_RR] = "rr", | |
219 | }; | |
220 | ||
221 | static const char *const hctx_flag_name[] = { | |
222 | [ilog2(BLK_MQ_F_SHOULD_MERGE)] = "SHOULD_MERGE", | |
223 | [ilog2(BLK_MQ_F_TAG_SHARED)] = "TAG_SHARED", | |
224 | [ilog2(BLK_MQ_F_SG_MERGE)] = "SG_MERGE", | |
225 | [ilog2(BLK_MQ_F_BLOCKING)] = "BLOCKING", | |
226 | [ilog2(BLK_MQ_F_NO_SCHED)] = "NO_SCHED", | |
227 | }; | |
228 | ||
9abb2ad2 OS |
229 | static int hctx_flags_show(struct seq_file *m, void *v) |
230 | { | |
231 | struct blk_mq_hw_ctx *hctx = m->private; | |
f5c0b091 | 232 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 233 | |
f5c0b091 BVA |
234 | seq_puts(m, "alloc_policy="); |
235 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
236 | alloc_policy_name[alloc_policy]) | |
237 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
238 | else | |
239 | seq_printf(m, "%d", alloc_policy); | |
240 | seq_puts(m, " "); | |
241 | blk_flags_show(m, | |
242 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
243 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
9abb2ad2 OS |
244 | return 0; |
245 | } | |
246 | ||
247 | static int hctx_flags_open(struct inode *inode, struct file *file) | |
248 | { | |
249 | return single_open(file, hctx_flags_show, inode->i_private); | |
250 | } | |
251 | ||
252 | static const struct file_operations hctx_flags_fops = { | |
253 | .open = hctx_flags_open, | |
254 | .read = seq_read, | |
255 | .llseek = seq_lseek, | |
256 | .release = single_release, | |
257 | }; | |
258 | ||
950cd7e9 OS |
259 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
260 | { | |
261 | struct request *rq = list_entry_rq(v); | |
262 | ||
aebf526b | 263 | seq_printf(m, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n", |
a1ae0f74 | 264 | rq, rq->cmd_flags, (__force unsigned int)rq->rq_flags, |
7b393852 | 265 | rq->tag, rq->internal_tag); |
950cd7e9 OS |
266 | return 0; |
267 | } | |
268 | ||
269 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 270 | __acquires(&hctx->lock) |
950cd7e9 OS |
271 | { |
272 | struct blk_mq_hw_ctx *hctx = m->private; | |
273 | ||
274 | spin_lock(&hctx->lock); | |
275 | return seq_list_start(&hctx->dispatch, *pos); | |
276 | } | |
277 | ||
278 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
279 | { | |
280 | struct blk_mq_hw_ctx *hctx = m->private; | |
281 | ||
282 | return seq_list_next(v, &hctx->dispatch, pos); | |
283 | } | |
284 | ||
285 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 286 | __releases(&hctx->lock) |
950cd7e9 OS |
287 | { |
288 | struct blk_mq_hw_ctx *hctx = m->private; | |
289 | ||
290 | spin_unlock(&hctx->lock); | |
291 | } | |
292 | ||
293 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
294 | .start = hctx_dispatch_start, | |
295 | .next = hctx_dispatch_next, | |
296 | .stop = hctx_dispatch_stop, | |
297 | .show = blk_mq_debugfs_rq_show, | |
298 | }; | |
299 | ||
300 | static int hctx_dispatch_open(struct inode *inode, struct file *file) | |
301 | { | |
302 | return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); | |
303 | } | |
304 | ||
305 | static const struct file_operations hctx_dispatch_fops = { | |
306 | .open = hctx_dispatch_open, | |
307 | .read = seq_read, | |
308 | .llseek = seq_lseek, | |
309 | .release = seq_release, | |
310 | }; | |
311 | ||
0bfa5288 OS |
312 | static int hctx_ctx_map_show(struct seq_file *m, void *v) |
313 | { | |
314 | struct blk_mq_hw_ctx *hctx = m->private; | |
315 | ||
316 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static int hctx_ctx_map_open(struct inode *inode, struct file *file) | |
321 | { | |
322 | return single_open(file, hctx_ctx_map_show, inode->i_private); | |
323 | } | |
324 | ||
325 | static const struct file_operations hctx_ctx_map_fops = { | |
326 | .open = hctx_ctx_map_open, | |
327 | .read = seq_read, | |
328 | .llseek = seq_lseek, | |
329 | .release = single_release, | |
330 | }; | |
331 | ||
d96b37c0 OS |
332 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
333 | struct blk_mq_tags *tags) | |
334 | { | |
335 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
336 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
337 | seq_printf(m, "active_queues=%d\n", | |
338 | atomic_read(&tags->active_queues)); | |
339 | ||
340 | seq_puts(m, "\nbitmap_tags:\n"); | |
341 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
342 | ||
343 | if (tags->nr_reserved_tags) { | |
344 | seq_puts(m, "\nbreserved_tags:\n"); | |
345 | sbitmap_queue_show(&tags->breserved_tags, m); | |
346 | } | |
347 | } | |
348 | ||
349 | static int hctx_tags_show(struct seq_file *m, void *v) | |
350 | { | |
351 | struct blk_mq_hw_ctx *hctx = m->private; | |
352 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 353 | int res; |
d96b37c0 | 354 | |
8c0f14ea BVA |
355 | res = mutex_lock_interruptible(&q->sysfs_lock); |
356 | if (res) | |
357 | goto out; | |
d96b37c0 OS |
358 | if (hctx->tags) |
359 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
360 | mutex_unlock(&q->sysfs_lock); | |
361 | ||
8c0f14ea BVA |
362 | out: |
363 | return res; | |
d96b37c0 OS |
364 | } |
365 | ||
366 | static int hctx_tags_open(struct inode *inode, struct file *file) | |
367 | { | |
368 | return single_open(file, hctx_tags_show, inode->i_private); | |
369 | } | |
370 | ||
371 | static const struct file_operations hctx_tags_fops = { | |
372 | .open = hctx_tags_open, | |
373 | .read = seq_read, | |
374 | .llseek = seq_lseek, | |
375 | .release = single_release, | |
376 | }; | |
377 | ||
d7e3621a OS |
378 | static int hctx_tags_bitmap_show(struct seq_file *m, void *v) |
379 | { | |
380 | struct blk_mq_hw_ctx *hctx = m->private; | |
381 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 382 | int res; |
d7e3621a | 383 | |
8c0f14ea BVA |
384 | res = mutex_lock_interruptible(&q->sysfs_lock); |
385 | if (res) | |
386 | goto out; | |
d7e3621a OS |
387 | if (hctx->tags) |
388 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
389 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
390 | |
391 | out: | |
392 | return res; | |
d7e3621a OS |
393 | } |
394 | ||
395 | static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) | |
396 | { | |
397 | return single_open(file, hctx_tags_bitmap_show, inode->i_private); | |
398 | } | |
399 | ||
400 | static const struct file_operations hctx_tags_bitmap_fops = { | |
401 | .open = hctx_tags_bitmap_open, | |
402 | .read = seq_read, | |
403 | .llseek = seq_lseek, | |
404 | .release = single_release, | |
405 | }; | |
406 | ||
d96b37c0 OS |
407 | static int hctx_sched_tags_show(struct seq_file *m, void *v) |
408 | { | |
409 | struct blk_mq_hw_ctx *hctx = m->private; | |
410 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 411 | int res; |
d96b37c0 | 412 | |
8c0f14ea BVA |
413 | res = mutex_lock_interruptible(&q->sysfs_lock); |
414 | if (res) | |
415 | goto out; | |
d96b37c0 OS |
416 | if (hctx->sched_tags) |
417 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
418 | mutex_unlock(&q->sysfs_lock); | |
419 | ||
8c0f14ea BVA |
420 | out: |
421 | return res; | |
d96b37c0 OS |
422 | } |
423 | ||
424 | static int hctx_sched_tags_open(struct inode *inode, struct file *file) | |
425 | { | |
426 | return single_open(file, hctx_sched_tags_show, inode->i_private); | |
427 | } | |
428 | ||
429 | static const struct file_operations hctx_sched_tags_fops = { | |
430 | .open = hctx_sched_tags_open, | |
431 | .read = seq_read, | |
432 | .llseek = seq_lseek, | |
433 | .release = single_release, | |
434 | }; | |
435 | ||
d7e3621a OS |
436 | static int hctx_sched_tags_bitmap_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; |
d7e3621a | 441 | |
8c0f14ea BVA |
442 | res = mutex_lock_interruptible(&q->sysfs_lock); |
443 | if (res) | |
444 | goto out; | |
d7e3621a OS |
445 | if (hctx->sched_tags) |
446 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
447 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
448 | |
449 | out: | |
450 | return res; | |
d7e3621a OS |
451 | } |
452 | ||
453 | static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) | |
454 | { | |
455 | return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); | |
456 | } | |
457 | ||
458 | static const struct file_operations hctx_sched_tags_bitmap_fops = { | |
459 | .open = hctx_sched_tags_bitmap_open, | |
460 | .read = seq_read, | |
461 | .llseek = seq_lseek, | |
462 | .release = single_release, | |
463 | }; | |
464 | ||
be215473 OS |
465 | static int hctx_io_poll_show(struct seq_file *m, void *v) |
466 | { | |
467 | struct blk_mq_hw_ctx *hctx = m->private; | |
468 | ||
469 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
470 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
471 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
472 | return 0; | |
473 | } | |
474 | ||
475 | static int hctx_io_poll_open(struct inode *inode, struct file *file) | |
476 | { | |
477 | return single_open(file, hctx_io_poll_show, inode->i_private); | |
478 | } | |
479 | ||
480 | static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, | |
481 | size_t count, loff_t *ppos) | |
482 | { | |
483 | struct seq_file *m = file->private_data; | |
484 | struct blk_mq_hw_ctx *hctx = m->private; | |
485 | ||
486 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
487 | return count; | |
488 | } | |
489 | ||
490 | static const struct file_operations hctx_io_poll_fops = { | |
491 | .open = hctx_io_poll_open, | |
492 | .read = seq_read, | |
493 | .write = hctx_io_poll_write, | |
494 | .llseek = seq_lseek, | |
495 | .release = single_release, | |
496 | }; | |
497 | ||
be215473 OS |
498 | static int hctx_dispatched_show(struct seq_file *m, void *v) |
499 | { | |
500 | struct blk_mq_hw_ctx *hctx = m->private; | |
501 | int i; | |
502 | ||
503 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
504 | ||
505 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
506 | unsigned int d = 1U << (i - 1); | |
507 | ||
508 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
509 | } | |
510 | ||
511 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
512 | return 0; | |
513 | } | |
514 | ||
515 | static int hctx_dispatched_open(struct inode *inode, struct file *file) | |
516 | { | |
517 | return single_open(file, hctx_dispatched_show, inode->i_private); | |
518 | } | |
519 | ||
520 | static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, | |
521 | size_t count, loff_t *ppos) | |
522 | { | |
523 | struct seq_file *m = file->private_data; | |
524 | struct blk_mq_hw_ctx *hctx = m->private; | |
525 | int i; | |
526 | ||
527 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
528 | hctx->dispatched[i] = 0; | |
529 | return count; | |
530 | } | |
531 | ||
532 | static const struct file_operations hctx_dispatched_fops = { | |
533 | .open = hctx_dispatched_open, | |
534 | .read = seq_read, | |
535 | .write = hctx_dispatched_write, | |
536 | .llseek = seq_lseek, | |
537 | .release = single_release, | |
538 | }; | |
539 | ||
4a46f05e OS |
540 | static int hctx_queued_show(struct seq_file *m, void *v) |
541 | { | |
542 | struct blk_mq_hw_ctx *hctx = m->private; | |
543 | ||
544 | seq_printf(m, "%lu\n", hctx->queued); | |
545 | return 0; | |
546 | } | |
547 | ||
548 | static int hctx_queued_open(struct inode *inode, struct file *file) | |
549 | { | |
550 | return single_open(file, hctx_queued_show, inode->i_private); | |
551 | } | |
552 | ||
553 | static ssize_t hctx_queued_write(struct file *file, const char __user *buf, | |
554 | size_t count, loff_t *ppos) | |
555 | { | |
556 | struct seq_file *m = file->private_data; | |
557 | struct blk_mq_hw_ctx *hctx = m->private; | |
558 | ||
559 | hctx->queued = 0; | |
560 | return count; | |
561 | } | |
562 | ||
563 | static const struct file_operations hctx_queued_fops = { | |
564 | .open = hctx_queued_open, | |
565 | .read = seq_read, | |
566 | .write = hctx_queued_write, | |
567 | .llseek = seq_lseek, | |
568 | .release = single_release, | |
569 | }; | |
570 | ||
571 | static int hctx_run_show(struct seq_file *m, void *v) | |
572 | { | |
573 | struct blk_mq_hw_ctx *hctx = m->private; | |
574 | ||
575 | seq_printf(m, "%lu\n", hctx->run); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | static int hctx_run_open(struct inode *inode, struct file *file) | |
580 | { | |
581 | return single_open(file, hctx_run_show, inode->i_private); | |
582 | } | |
583 | ||
584 | static ssize_t hctx_run_write(struct file *file, const char __user *buf, | |
585 | size_t count, loff_t *ppos) | |
586 | { | |
587 | struct seq_file *m = file->private_data; | |
588 | struct blk_mq_hw_ctx *hctx = m->private; | |
589 | ||
590 | hctx->run = 0; | |
591 | return count; | |
592 | } | |
593 | ||
594 | static const struct file_operations hctx_run_fops = { | |
595 | .open = hctx_run_open, | |
596 | .read = seq_read, | |
597 | .write = hctx_run_write, | |
598 | .llseek = seq_lseek, | |
599 | .release = single_release, | |
600 | }; | |
601 | ||
602 | static int hctx_active_show(struct seq_file *m, void *v) | |
603 | { | |
604 | struct blk_mq_hw_ctx *hctx = m->private; | |
605 | ||
606 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
607 | return 0; | |
608 | } | |
609 | ||
610 | static int hctx_active_open(struct inode *inode, struct file *file) | |
611 | { | |
612 | return single_open(file, hctx_active_show, inode->i_private); | |
613 | } | |
614 | ||
615 | static const struct file_operations hctx_active_fops = { | |
616 | .open = hctx_active_open, | |
617 | .read = seq_read, | |
618 | .llseek = seq_lseek, | |
619 | .release = single_release, | |
620 | }; | |
621 | ||
950cd7e9 | 622 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 623 | __acquires(&ctx->lock) |
950cd7e9 OS |
624 | { |
625 | struct blk_mq_ctx *ctx = m->private; | |
626 | ||
627 | spin_lock(&ctx->lock); | |
628 | return seq_list_start(&ctx->rq_list, *pos); | |
629 | } | |
630 | ||
631 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
632 | { | |
633 | struct blk_mq_ctx *ctx = m->private; | |
634 | ||
635 | return seq_list_next(v, &ctx->rq_list, pos); | |
636 | } | |
637 | ||
638 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 639 | __releases(&ctx->lock) |
950cd7e9 OS |
640 | { |
641 | struct blk_mq_ctx *ctx = m->private; | |
642 | ||
643 | spin_unlock(&ctx->lock); | |
644 | } | |
645 | ||
646 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
647 | .start = ctx_rq_list_start, | |
648 | .next = ctx_rq_list_next, | |
649 | .stop = ctx_rq_list_stop, | |
650 | .show = blk_mq_debugfs_rq_show, | |
651 | }; | |
652 | ||
653 | static int ctx_rq_list_open(struct inode *inode, struct file *file) | |
654 | { | |
655 | return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); | |
656 | } | |
657 | ||
658 | static const struct file_operations ctx_rq_list_fops = { | |
659 | .open = ctx_rq_list_open, | |
660 | .read = seq_read, | |
661 | .llseek = seq_lseek, | |
662 | .release = seq_release, | |
663 | }; | |
664 | ||
4a46f05e OS |
665 | static int ctx_dispatched_show(struct seq_file *m, void *v) |
666 | { | |
667 | struct blk_mq_ctx *ctx = m->private; | |
668 | ||
669 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int ctx_dispatched_open(struct inode *inode, struct file *file) | |
674 | { | |
675 | return single_open(file, ctx_dispatched_show, inode->i_private); | |
676 | } | |
677 | ||
678 | static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, | |
679 | size_t count, loff_t *ppos) | |
680 | { | |
681 | struct seq_file *m = file->private_data; | |
682 | struct blk_mq_ctx *ctx = m->private; | |
683 | ||
684 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
685 | return count; | |
686 | } | |
687 | ||
688 | static const struct file_operations ctx_dispatched_fops = { | |
689 | .open = ctx_dispatched_open, | |
690 | .read = seq_read, | |
691 | .write = ctx_dispatched_write, | |
692 | .llseek = seq_lseek, | |
693 | .release = single_release, | |
694 | }; | |
695 | ||
696 | static int ctx_merged_show(struct seq_file *m, void *v) | |
697 | { | |
698 | struct blk_mq_ctx *ctx = m->private; | |
699 | ||
700 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static int ctx_merged_open(struct inode *inode, struct file *file) | |
705 | { | |
706 | return single_open(file, ctx_merged_show, inode->i_private); | |
707 | } | |
708 | ||
709 | static ssize_t ctx_merged_write(struct file *file, const char __user *buf, | |
710 | size_t count, loff_t *ppos) | |
711 | { | |
712 | struct seq_file *m = file->private_data; | |
713 | struct blk_mq_ctx *ctx = m->private; | |
714 | ||
715 | ctx->rq_merged = 0; | |
716 | return count; | |
717 | } | |
718 | ||
719 | static const struct file_operations ctx_merged_fops = { | |
720 | .open = ctx_merged_open, | |
721 | .read = seq_read, | |
722 | .write = ctx_merged_write, | |
723 | .llseek = seq_lseek, | |
724 | .release = single_release, | |
725 | }; | |
726 | ||
727 | static int ctx_completed_show(struct seq_file *m, void *v) | |
728 | { | |
729 | struct blk_mq_ctx *ctx = m->private; | |
730 | ||
731 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
732 | return 0; | |
733 | } | |
734 | ||
735 | static int ctx_completed_open(struct inode *inode, struct file *file) | |
736 | { | |
737 | return single_open(file, ctx_completed_show, inode->i_private); | |
738 | } | |
739 | ||
740 | static ssize_t ctx_completed_write(struct file *file, const char __user *buf, | |
741 | size_t count, loff_t *ppos) | |
742 | { | |
743 | struct seq_file *m = file->private_data; | |
744 | struct blk_mq_ctx *ctx = m->private; | |
745 | ||
746 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
747 | return count; | |
748 | } | |
749 | ||
750 | static const struct file_operations ctx_completed_fops = { | |
751 | .open = ctx_completed_open, | |
752 | .read = seq_read, | |
753 | .write = ctx_completed_write, | |
754 | .llseek = seq_lseek, | |
755 | .release = single_release, | |
756 | }; | |
757 | ||
34dbad5d OS |
758 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
759 | {"poll_stat", 0400, &queue_poll_stat_fops}, | |
760 | {}, | |
761 | }; | |
762 | ||
07e4fead | 763 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
9abb2ad2 OS |
764 | {"state", 0400, &hctx_state_fops}, |
765 | {"flags", 0400, &hctx_flags_fops}, | |
950cd7e9 | 766 | {"dispatch", 0400, &hctx_dispatch_fops}, |
0bfa5288 | 767 | {"ctx_map", 0400, &hctx_ctx_map_fops}, |
d96b37c0 | 768 | {"tags", 0400, &hctx_tags_fops}, |
d7e3621a | 769 | {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, |
d96b37c0 | 770 | {"sched_tags", 0400, &hctx_sched_tags_fops}, |
d7e3621a | 771 | {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, |
be215473 | 772 | {"io_poll", 0600, &hctx_io_poll_fops}, |
be215473 | 773 | {"dispatched", 0600, &hctx_dispatched_fops}, |
4a46f05e OS |
774 | {"queued", 0600, &hctx_queued_fops}, |
775 | {"run", 0600, &hctx_run_fops}, | |
776 | {"active", 0400, &hctx_active_fops}, | |
72f2f8f6 | 777 | {}, |
07e4fead OS |
778 | }; |
779 | ||
780 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
950cd7e9 | 781 | {"rq_list", 0400, &ctx_rq_list_fops}, |
4a46f05e OS |
782 | {"dispatched", 0600, &ctx_dispatched_fops}, |
783 | {"merged", 0600, &ctx_merged_fops}, | |
784 | {"completed", 0600, &ctx_completed_fops}, | |
72f2f8f6 | 785 | {}, |
07e4fead OS |
786 | }; |
787 | ||
788 | int blk_mq_debugfs_register(struct request_queue *q, const char *name) | |
789 | { | |
18fbda91 | 790 | if (!blk_debugfs_root) |
07e4fead OS |
791 | return -ENOENT; |
792 | ||
18fbda91 | 793 | q->debugfs_dir = debugfs_create_dir(name, blk_debugfs_root); |
07e4fead OS |
794 | if (!q->debugfs_dir) |
795 | goto err; | |
796 | ||
797 | if (blk_mq_debugfs_register_hctxs(q)) | |
798 | goto err; | |
799 | ||
800 | return 0; | |
801 | ||
802 | err: | |
803 | blk_mq_debugfs_unregister(q); | |
804 | return -ENOMEM; | |
805 | } | |
806 | ||
807 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
808 | { | |
809 | debugfs_remove_recursive(q->debugfs_dir); | |
810 | q->mq_debugfs_dir = NULL; | |
811 | q->debugfs_dir = NULL; | |
812 | } | |
813 | ||
72f2f8f6 BVA |
814 | static bool debugfs_create_files(struct dentry *parent, void *data, |
815 | const struct blk_mq_debugfs_attr *attr) | |
816 | { | |
817 | for (; attr->name; attr++) { | |
818 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
819 | data, attr->fops)) | |
820 | return false; | |
821 | } | |
822 | return true; | |
823 | } | |
824 | ||
07e4fead OS |
825 | static int blk_mq_debugfs_register_ctx(struct request_queue *q, |
826 | struct blk_mq_ctx *ctx, | |
827 | struct dentry *hctx_dir) | |
828 | { | |
829 | struct dentry *ctx_dir; | |
830 | char name[20]; | |
07e4fead OS |
831 | |
832 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
833 | ctx_dir = debugfs_create_dir(name, hctx_dir); | |
834 | if (!ctx_dir) | |
835 | return -ENOMEM; | |
836 | ||
72f2f8f6 BVA |
837 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
838 | return -ENOMEM; | |
07e4fead OS |
839 | |
840 | return 0; | |
841 | } | |
842 | ||
843 | static int blk_mq_debugfs_register_hctx(struct request_queue *q, | |
844 | struct blk_mq_hw_ctx *hctx) | |
845 | { | |
846 | struct blk_mq_ctx *ctx; | |
847 | struct dentry *hctx_dir; | |
848 | char name[20]; | |
849 | int i; | |
850 | ||
851 | snprintf(name, sizeof(name), "%u", hctx->queue_num); | |
852 | hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); | |
853 | if (!hctx_dir) | |
854 | return -ENOMEM; | |
855 | ||
72f2f8f6 BVA |
856 | if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) |
857 | return -ENOMEM; | |
07e4fead OS |
858 | |
859 | hctx_for_each_ctx(hctx, ctx, i) { | |
860 | if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) | |
861 | return -ENOMEM; | |
862 | } | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) | |
868 | { | |
869 | struct blk_mq_hw_ctx *hctx; | |
870 | int i; | |
871 | ||
872 | if (!q->debugfs_dir) | |
873 | return -ENOENT; | |
874 | ||
91d68905 BVA |
875 | if (!debugfs_create_files(q->debugfs_dir, q, blk_queue_attrs)) |
876 | goto err; | |
877 | ||
07e4fead OS |
878 | q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); |
879 | if (!q->mq_debugfs_dir) | |
880 | goto err; | |
881 | ||
34dbad5d OS |
882 | if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs)) |
883 | goto err; | |
884 | ||
07e4fead OS |
885 | queue_for_each_hw_ctx(q, hctx, i) { |
886 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
887 | goto err; | |
888 | } | |
889 | ||
890 | return 0; | |
891 | ||
892 | err: | |
893 | blk_mq_debugfs_unregister_hctxs(q); | |
894 | return -ENOMEM; | |
895 | } | |
896 | ||
897 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) | |
898 | { | |
899 | debugfs_remove_recursive(q->mq_debugfs_dir); | |
900 | q->mq_debugfs_dir = NULL; | |
901 | } |