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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 | ||
9abb2ad2 OS |
46 | static int hctx_state_show(struct seq_file *m, void *v) |
47 | { | |
48 | struct blk_mq_hw_ctx *hctx = m->private; | |
49 | ||
50 | seq_printf(m, "0x%lx\n", hctx->state); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static int hctx_state_open(struct inode *inode, struct file *file) | |
55 | { | |
56 | return single_open(file, hctx_state_show, inode->i_private); | |
57 | } | |
58 | ||
59 | static const struct file_operations hctx_state_fops = { | |
60 | .open = hctx_state_open, | |
61 | .read = seq_read, | |
62 | .llseek = seq_lseek, | |
63 | .release = single_release, | |
64 | }; | |
65 | ||
66 | static int hctx_flags_show(struct seq_file *m, void *v) | |
67 | { | |
68 | struct blk_mq_hw_ctx *hctx = m->private; | |
69 | ||
70 | seq_printf(m, "0x%lx\n", hctx->flags); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int hctx_flags_open(struct inode *inode, struct file *file) | |
75 | { | |
76 | return single_open(file, hctx_flags_show, inode->i_private); | |
77 | } | |
78 | ||
79 | static const struct file_operations hctx_flags_fops = { | |
80 | .open = hctx_flags_open, | |
81 | .read = seq_read, | |
82 | .llseek = seq_lseek, | |
83 | .release = single_release, | |
84 | }; | |
85 | ||
950cd7e9 OS |
86 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
87 | { | |
88 | struct request *rq = list_entry_rq(v); | |
89 | ||
aebf526b | 90 | seq_printf(m, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n", |
a1ae0f74 | 91 | rq, rq->cmd_flags, (__force unsigned int)rq->rq_flags, |
7b393852 | 92 | rq->tag, rq->internal_tag); |
950cd7e9 OS |
93 | return 0; |
94 | } | |
95 | ||
96 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 97 | __acquires(&hctx->lock) |
950cd7e9 OS |
98 | { |
99 | struct blk_mq_hw_ctx *hctx = m->private; | |
100 | ||
101 | spin_lock(&hctx->lock); | |
102 | return seq_list_start(&hctx->dispatch, *pos); | |
103 | } | |
104 | ||
105 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
106 | { | |
107 | struct blk_mq_hw_ctx *hctx = m->private; | |
108 | ||
109 | return seq_list_next(v, &hctx->dispatch, pos); | |
110 | } | |
111 | ||
112 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 113 | __releases(&hctx->lock) |
950cd7e9 OS |
114 | { |
115 | struct blk_mq_hw_ctx *hctx = m->private; | |
116 | ||
117 | spin_unlock(&hctx->lock); | |
118 | } | |
119 | ||
120 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
121 | .start = hctx_dispatch_start, | |
122 | .next = hctx_dispatch_next, | |
123 | .stop = hctx_dispatch_stop, | |
124 | .show = blk_mq_debugfs_rq_show, | |
125 | }; | |
126 | ||
127 | static int hctx_dispatch_open(struct inode *inode, struct file *file) | |
128 | { | |
129 | return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); | |
130 | } | |
131 | ||
132 | static const struct file_operations hctx_dispatch_fops = { | |
133 | .open = hctx_dispatch_open, | |
134 | .read = seq_read, | |
135 | .llseek = seq_lseek, | |
136 | .release = seq_release, | |
137 | }; | |
138 | ||
0bfa5288 OS |
139 | static int hctx_ctx_map_show(struct seq_file *m, void *v) |
140 | { | |
141 | struct blk_mq_hw_ctx *hctx = m->private; | |
142 | ||
143 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static int hctx_ctx_map_open(struct inode *inode, struct file *file) | |
148 | { | |
149 | return single_open(file, hctx_ctx_map_show, inode->i_private); | |
150 | } | |
151 | ||
152 | static const struct file_operations hctx_ctx_map_fops = { | |
153 | .open = hctx_ctx_map_open, | |
154 | .read = seq_read, | |
155 | .llseek = seq_lseek, | |
156 | .release = single_release, | |
157 | }; | |
158 | ||
d96b37c0 OS |
159 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
160 | struct blk_mq_tags *tags) | |
161 | { | |
162 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
163 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
164 | seq_printf(m, "active_queues=%d\n", | |
165 | atomic_read(&tags->active_queues)); | |
166 | ||
167 | seq_puts(m, "\nbitmap_tags:\n"); | |
168 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
169 | ||
170 | if (tags->nr_reserved_tags) { | |
171 | seq_puts(m, "\nbreserved_tags:\n"); | |
172 | sbitmap_queue_show(&tags->breserved_tags, m); | |
173 | } | |
174 | } | |
175 | ||
176 | static int hctx_tags_show(struct seq_file *m, void *v) | |
177 | { | |
178 | struct blk_mq_hw_ctx *hctx = m->private; | |
179 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 180 | int res; |
d96b37c0 | 181 | |
8c0f14ea BVA |
182 | res = mutex_lock_interruptible(&q->sysfs_lock); |
183 | if (res) | |
184 | goto out; | |
d96b37c0 OS |
185 | if (hctx->tags) |
186 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
187 | mutex_unlock(&q->sysfs_lock); | |
188 | ||
8c0f14ea BVA |
189 | out: |
190 | return res; | |
d96b37c0 OS |
191 | } |
192 | ||
193 | static int hctx_tags_open(struct inode *inode, struct file *file) | |
194 | { | |
195 | return single_open(file, hctx_tags_show, inode->i_private); | |
196 | } | |
197 | ||
198 | static const struct file_operations hctx_tags_fops = { | |
199 | .open = hctx_tags_open, | |
200 | .read = seq_read, | |
201 | .llseek = seq_lseek, | |
202 | .release = single_release, | |
203 | }; | |
204 | ||
d7e3621a OS |
205 | static int hctx_tags_bitmap_show(struct seq_file *m, void *v) |
206 | { | |
207 | struct blk_mq_hw_ctx *hctx = m->private; | |
208 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 209 | int res; |
d7e3621a | 210 | |
8c0f14ea BVA |
211 | res = mutex_lock_interruptible(&q->sysfs_lock); |
212 | if (res) | |
213 | goto out; | |
d7e3621a OS |
214 | if (hctx->tags) |
215 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
216 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
217 | |
218 | out: | |
219 | return res; | |
d7e3621a OS |
220 | } |
221 | ||
222 | static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) | |
223 | { | |
224 | return single_open(file, hctx_tags_bitmap_show, inode->i_private); | |
225 | } | |
226 | ||
227 | static const struct file_operations hctx_tags_bitmap_fops = { | |
228 | .open = hctx_tags_bitmap_open, | |
229 | .read = seq_read, | |
230 | .llseek = seq_lseek, | |
231 | .release = single_release, | |
232 | }; | |
233 | ||
d96b37c0 OS |
234 | static int hctx_sched_tags_show(struct seq_file *m, void *v) |
235 | { | |
236 | struct blk_mq_hw_ctx *hctx = m->private; | |
237 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 238 | int res; |
d96b37c0 | 239 | |
8c0f14ea BVA |
240 | res = mutex_lock_interruptible(&q->sysfs_lock); |
241 | if (res) | |
242 | goto out; | |
d96b37c0 OS |
243 | if (hctx->sched_tags) |
244 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
245 | mutex_unlock(&q->sysfs_lock); | |
246 | ||
8c0f14ea BVA |
247 | out: |
248 | return res; | |
d96b37c0 OS |
249 | } |
250 | ||
251 | static int hctx_sched_tags_open(struct inode *inode, struct file *file) | |
252 | { | |
253 | return single_open(file, hctx_sched_tags_show, inode->i_private); | |
254 | } | |
255 | ||
256 | static const struct file_operations hctx_sched_tags_fops = { | |
257 | .open = hctx_sched_tags_open, | |
258 | .read = seq_read, | |
259 | .llseek = seq_lseek, | |
260 | .release = single_release, | |
261 | }; | |
262 | ||
d7e3621a OS |
263 | static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) |
264 | { | |
265 | struct blk_mq_hw_ctx *hctx = m->private; | |
266 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 267 | int res; |
d7e3621a | 268 | |
8c0f14ea BVA |
269 | res = mutex_lock_interruptible(&q->sysfs_lock); |
270 | if (res) | |
271 | goto out; | |
d7e3621a OS |
272 | if (hctx->sched_tags) |
273 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
274 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
275 | |
276 | out: | |
277 | return res; | |
d7e3621a OS |
278 | } |
279 | ||
280 | static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) | |
281 | { | |
282 | return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); | |
283 | } | |
284 | ||
285 | static const struct file_operations hctx_sched_tags_bitmap_fops = { | |
286 | .open = hctx_sched_tags_bitmap_open, | |
287 | .read = seq_read, | |
288 | .llseek = seq_lseek, | |
289 | .release = single_release, | |
290 | }; | |
291 | ||
be215473 OS |
292 | static int hctx_io_poll_show(struct seq_file *m, void *v) |
293 | { | |
294 | struct blk_mq_hw_ctx *hctx = m->private; | |
295 | ||
296 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
297 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
298 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static int hctx_io_poll_open(struct inode *inode, struct file *file) | |
303 | { | |
304 | return single_open(file, hctx_io_poll_show, inode->i_private); | |
305 | } | |
306 | ||
307 | static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, | |
308 | size_t count, loff_t *ppos) | |
309 | { | |
310 | struct seq_file *m = file->private_data; | |
311 | struct blk_mq_hw_ctx *hctx = m->private; | |
312 | ||
313 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
314 | return count; | |
315 | } | |
316 | ||
317 | static const struct file_operations hctx_io_poll_fops = { | |
318 | .open = hctx_io_poll_open, | |
319 | .read = seq_read, | |
320 | .write = hctx_io_poll_write, | |
321 | .llseek = seq_lseek, | |
322 | .release = single_release, | |
323 | }; | |
324 | ||
325 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) | |
326 | { | |
327 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
328 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
329 | } | |
330 | ||
331 | static int hctx_stats_show(struct seq_file *m, void *v) | |
332 | { | |
333 | struct blk_mq_hw_ctx *hctx = m->private; | |
334 | struct blk_rq_stat stat[2]; | |
335 | ||
336 | blk_stat_init(&stat[BLK_STAT_READ]); | |
337 | blk_stat_init(&stat[BLK_STAT_WRITE]); | |
338 | ||
339 | blk_hctx_stat_get(hctx, stat); | |
340 | ||
341 | seq_puts(m, "read: "); | |
342 | print_stat(m, &stat[BLK_STAT_READ]); | |
343 | seq_puts(m, "\n"); | |
344 | ||
345 | seq_puts(m, "write: "); | |
346 | print_stat(m, &stat[BLK_STAT_WRITE]); | |
347 | seq_puts(m, "\n"); | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static int hctx_stats_open(struct inode *inode, struct file *file) | |
352 | { | |
353 | return single_open(file, hctx_stats_show, inode->i_private); | |
354 | } | |
355 | ||
356 | static ssize_t hctx_stats_write(struct file *file, const char __user *buf, | |
357 | size_t count, loff_t *ppos) | |
358 | { | |
359 | struct seq_file *m = file->private_data; | |
360 | struct blk_mq_hw_ctx *hctx = m->private; | |
361 | struct blk_mq_ctx *ctx; | |
362 | int i; | |
363 | ||
364 | hctx_for_each_ctx(hctx, ctx, i) { | |
365 | blk_stat_init(&ctx->stat[BLK_STAT_READ]); | |
366 | blk_stat_init(&ctx->stat[BLK_STAT_WRITE]); | |
367 | } | |
368 | return count; | |
369 | } | |
370 | ||
371 | static const struct file_operations hctx_stats_fops = { | |
372 | .open = hctx_stats_open, | |
373 | .read = seq_read, | |
374 | .write = hctx_stats_write, | |
375 | .llseek = seq_lseek, | |
376 | .release = single_release, | |
377 | }; | |
378 | ||
379 | static int hctx_dispatched_show(struct seq_file *m, void *v) | |
380 | { | |
381 | struct blk_mq_hw_ctx *hctx = m->private; | |
382 | int i; | |
383 | ||
384 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
385 | ||
386 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
387 | unsigned int d = 1U << (i - 1); | |
388 | ||
389 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
390 | } | |
391 | ||
392 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
393 | return 0; | |
394 | } | |
395 | ||
396 | static int hctx_dispatched_open(struct inode *inode, struct file *file) | |
397 | { | |
398 | return single_open(file, hctx_dispatched_show, inode->i_private); | |
399 | } | |
400 | ||
401 | static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, | |
402 | size_t count, loff_t *ppos) | |
403 | { | |
404 | struct seq_file *m = file->private_data; | |
405 | struct blk_mq_hw_ctx *hctx = m->private; | |
406 | int i; | |
407 | ||
408 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
409 | hctx->dispatched[i] = 0; | |
410 | return count; | |
411 | } | |
412 | ||
413 | static const struct file_operations hctx_dispatched_fops = { | |
414 | .open = hctx_dispatched_open, | |
415 | .read = seq_read, | |
416 | .write = hctx_dispatched_write, | |
417 | .llseek = seq_lseek, | |
418 | .release = single_release, | |
419 | }; | |
420 | ||
4a46f05e OS |
421 | static int hctx_queued_show(struct seq_file *m, void *v) |
422 | { | |
423 | struct blk_mq_hw_ctx *hctx = m->private; | |
424 | ||
425 | seq_printf(m, "%lu\n", hctx->queued); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static int hctx_queued_open(struct inode *inode, struct file *file) | |
430 | { | |
431 | return single_open(file, hctx_queued_show, inode->i_private); | |
432 | } | |
433 | ||
434 | static ssize_t hctx_queued_write(struct file *file, const char __user *buf, | |
435 | size_t count, loff_t *ppos) | |
436 | { | |
437 | struct seq_file *m = file->private_data; | |
438 | struct blk_mq_hw_ctx *hctx = m->private; | |
439 | ||
440 | hctx->queued = 0; | |
441 | return count; | |
442 | } | |
443 | ||
444 | static const struct file_operations hctx_queued_fops = { | |
445 | .open = hctx_queued_open, | |
446 | .read = seq_read, | |
447 | .write = hctx_queued_write, | |
448 | .llseek = seq_lseek, | |
449 | .release = single_release, | |
450 | }; | |
451 | ||
452 | static int hctx_run_show(struct seq_file *m, void *v) | |
453 | { | |
454 | struct blk_mq_hw_ctx *hctx = m->private; | |
455 | ||
456 | seq_printf(m, "%lu\n", hctx->run); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | static int hctx_run_open(struct inode *inode, struct file *file) | |
461 | { | |
462 | return single_open(file, hctx_run_show, inode->i_private); | |
463 | } | |
464 | ||
465 | static ssize_t hctx_run_write(struct file *file, const char __user *buf, | |
466 | size_t count, loff_t *ppos) | |
467 | { | |
468 | struct seq_file *m = file->private_data; | |
469 | struct blk_mq_hw_ctx *hctx = m->private; | |
470 | ||
471 | hctx->run = 0; | |
472 | return count; | |
473 | } | |
474 | ||
475 | static const struct file_operations hctx_run_fops = { | |
476 | .open = hctx_run_open, | |
477 | .read = seq_read, | |
478 | .write = hctx_run_write, | |
479 | .llseek = seq_lseek, | |
480 | .release = single_release, | |
481 | }; | |
482 | ||
483 | static int hctx_active_show(struct seq_file *m, void *v) | |
484 | { | |
485 | struct blk_mq_hw_ctx *hctx = m->private; | |
486 | ||
487 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
488 | return 0; | |
489 | } | |
490 | ||
491 | static int hctx_active_open(struct inode *inode, struct file *file) | |
492 | { | |
493 | return single_open(file, hctx_active_show, inode->i_private); | |
494 | } | |
495 | ||
496 | static const struct file_operations hctx_active_fops = { | |
497 | .open = hctx_active_open, | |
498 | .read = seq_read, | |
499 | .llseek = seq_lseek, | |
500 | .release = single_release, | |
501 | }; | |
502 | ||
950cd7e9 | 503 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 504 | __acquires(&ctx->lock) |
950cd7e9 OS |
505 | { |
506 | struct blk_mq_ctx *ctx = m->private; | |
507 | ||
508 | spin_lock(&ctx->lock); | |
509 | return seq_list_start(&ctx->rq_list, *pos); | |
510 | } | |
511 | ||
512 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
513 | { | |
514 | struct blk_mq_ctx *ctx = m->private; | |
515 | ||
516 | return seq_list_next(v, &ctx->rq_list, pos); | |
517 | } | |
518 | ||
519 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 520 | __releases(&ctx->lock) |
950cd7e9 OS |
521 | { |
522 | struct blk_mq_ctx *ctx = m->private; | |
523 | ||
524 | spin_unlock(&ctx->lock); | |
525 | } | |
526 | ||
527 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
528 | .start = ctx_rq_list_start, | |
529 | .next = ctx_rq_list_next, | |
530 | .stop = ctx_rq_list_stop, | |
531 | .show = blk_mq_debugfs_rq_show, | |
532 | }; | |
533 | ||
534 | static int ctx_rq_list_open(struct inode *inode, struct file *file) | |
535 | { | |
536 | return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); | |
537 | } | |
538 | ||
539 | static const struct file_operations ctx_rq_list_fops = { | |
540 | .open = ctx_rq_list_open, | |
541 | .read = seq_read, | |
542 | .llseek = seq_lseek, | |
543 | .release = seq_release, | |
544 | }; | |
545 | ||
4a46f05e OS |
546 | static int ctx_dispatched_show(struct seq_file *m, void *v) |
547 | { | |
548 | struct blk_mq_ctx *ctx = m->private; | |
549 | ||
550 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static int ctx_dispatched_open(struct inode *inode, struct file *file) | |
555 | { | |
556 | return single_open(file, ctx_dispatched_show, inode->i_private); | |
557 | } | |
558 | ||
559 | static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, | |
560 | size_t count, loff_t *ppos) | |
561 | { | |
562 | struct seq_file *m = file->private_data; | |
563 | struct blk_mq_ctx *ctx = m->private; | |
564 | ||
565 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
566 | return count; | |
567 | } | |
568 | ||
569 | static const struct file_operations ctx_dispatched_fops = { | |
570 | .open = ctx_dispatched_open, | |
571 | .read = seq_read, | |
572 | .write = ctx_dispatched_write, | |
573 | .llseek = seq_lseek, | |
574 | .release = single_release, | |
575 | }; | |
576 | ||
577 | static int ctx_merged_show(struct seq_file *m, void *v) | |
578 | { | |
579 | struct blk_mq_ctx *ctx = m->private; | |
580 | ||
581 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
582 | return 0; | |
583 | } | |
584 | ||
585 | static int ctx_merged_open(struct inode *inode, struct file *file) | |
586 | { | |
587 | return single_open(file, ctx_merged_show, inode->i_private); | |
588 | } | |
589 | ||
590 | static ssize_t ctx_merged_write(struct file *file, const char __user *buf, | |
591 | size_t count, loff_t *ppos) | |
592 | { | |
593 | struct seq_file *m = file->private_data; | |
594 | struct blk_mq_ctx *ctx = m->private; | |
595 | ||
596 | ctx->rq_merged = 0; | |
597 | return count; | |
598 | } | |
599 | ||
600 | static const struct file_operations ctx_merged_fops = { | |
601 | .open = ctx_merged_open, | |
602 | .read = seq_read, | |
603 | .write = ctx_merged_write, | |
604 | .llseek = seq_lseek, | |
605 | .release = single_release, | |
606 | }; | |
607 | ||
608 | static int ctx_completed_show(struct seq_file *m, void *v) | |
609 | { | |
610 | struct blk_mq_ctx *ctx = m->private; | |
611 | ||
612 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | static int ctx_completed_open(struct inode *inode, struct file *file) | |
617 | { | |
618 | return single_open(file, ctx_completed_show, inode->i_private); | |
619 | } | |
620 | ||
621 | static ssize_t ctx_completed_write(struct file *file, const char __user *buf, | |
622 | size_t count, loff_t *ppos) | |
623 | { | |
624 | struct seq_file *m = file->private_data; | |
625 | struct blk_mq_ctx *ctx = m->private; | |
626 | ||
627 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
628 | return count; | |
629 | } | |
630 | ||
631 | static const struct file_operations ctx_completed_fops = { | |
632 | .open = ctx_completed_open, | |
633 | .read = seq_read, | |
634 | .write = ctx_completed_write, | |
635 | .llseek = seq_lseek, | |
636 | .release = single_release, | |
637 | }; | |
638 | ||
07e4fead | 639 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
9abb2ad2 OS |
640 | {"state", 0400, &hctx_state_fops}, |
641 | {"flags", 0400, &hctx_flags_fops}, | |
950cd7e9 | 642 | {"dispatch", 0400, &hctx_dispatch_fops}, |
0bfa5288 | 643 | {"ctx_map", 0400, &hctx_ctx_map_fops}, |
d96b37c0 | 644 | {"tags", 0400, &hctx_tags_fops}, |
d7e3621a | 645 | {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, |
d96b37c0 | 646 | {"sched_tags", 0400, &hctx_sched_tags_fops}, |
d7e3621a | 647 | {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, |
be215473 OS |
648 | {"io_poll", 0600, &hctx_io_poll_fops}, |
649 | {"stats", 0600, &hctx_stats_fops}, | |
650 | {"dispatched", 0600, &hctx_dispatched_fops}, | |
4a46f05e OS |
651 | {"queued", 0600, &hctx_queued_fops}, |
652 | {"run", 0600, &hctx_run_fops}, | |
653 | {"active", 0400, &hctx_active_fops}, | |
72f2f8f6 | 654 | {}, |
07e4fead OS |
655 | }; |
656 | ||
657 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
950cd7e9 | 658 | {"rq_list", 0400, &ctx_rq_list_fops}, |
4a46f05e OS |
659 | {"dispatched", 0600, &ctx_dispatched_fops}, |
660 | {"merged", 0600, &ctx_merged_fops}, | |
661 | {"completed", 0600, &ctx_completed_fops}, | |
72f2f8f6 | 662 | {}, |
07e4fead OS |
663 | }; |
664 | ||
665 | int blk_mq_debugfs_register(struct request_queue *q, const char *name) | |
666 | { | |
18fbda91 | 667 | if (!blk_debugfs_root) |
07e4fead OS |
668 | return -ENOENT; |
669 | ||
18fbda91 | 670 | q->debugfs_dir = debugfs_create_dir(name, blk_debugfs_root); |
07e4fead OS |
671 | if (!q->debugfs_dir) |
672 | goto err; | |
673 | ||
674 | if (blk_mq_debugfs_register_hctxs(q)) | |
675 | goto err; | |
676 | ||
677 | return 0; | |
678 | ||
679 | err: | |
680 | blk_mq_debugfs_unregister(q); | |
681 | return -ENOMEM; | |
682 | } | |
683 | ||
684 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
685 | { | |
686 | debugfs_remove_recursive(q->debugfs_dir); | |
687 | q->mq_debugfs_dir = NULL; | |
688 | q->debugfs_dir = NULL; | |
689 | } | |
690 | ||
72f2f8f6 BVA |
691 | static bool debugfs_create_files(struct dentry *parent, void *data, |
692 | const struct blk_mq_debugfs_attr *attr) | |
693 | { | |
694 | for (; attr->name; attr++) { | |
695 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
696 | data, attr->fops)) | |
697 | return false; | |
698 | } | |
699 | return true; | |
700 | } | |
701 | ||
07e4fead OS |
702 | static int blk_mq_debugfs_register_ctx(struct request_queue *q, |
703 | struct blk_mq_ctx *ctx, | |
704 | struct dentry *hctx_dir) | |
705 | { | |
706 | struct dentry *ctx_dir; | |
707 | char name[20]; | |
07e4fead OS |
708 | |
709 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
710 | ctx_dir = debugfs_create_dir(name, hctx_dir); | |
711 | if (!ctx_dir) | |
712 | return -ENOMEM; | |
713 | ||
72f2f8f6 BVA |
714 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
715 | return -ENOMEM; | |
07e4fead OS |
716 | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static int blk_mq_debugfs_register_hctx(struct request_queue *q, | |
721 | struct blk_mq_hw_ctx *hctx) | |
722 | { | |
723 | struct blk_mq_ctx *ctx; | |
724 | struct dentry *hctx_dir; | |
725 | char name[20]; | |
726 | int i; | |
727 | ||
728 | snprintf(name, sizeof(name), "%u", hctx->queue_num); | |
729 | hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); | |
730 | if (!hctx_dir) | |
731 | return -ENOMEM; | |
732 | ||
72f2f8f6 BVA |
733 | if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) |
734 | return -ENOMEM; | |
07e4fead OS |
735 | |
736 | hctx_for_each_ctx(hctx, ctx, i) { | |
737 | if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) | |
738 | return -ENOMEM; | |
739 | } | |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
744 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) | |
745 | { | |
746 | struct blk_mq_hw_ctx *hctx; | |
747 | int i; | |
748 | ||
749 | if (!q->debugfs_dir) | |
750 | return -ENOENT; | |
751 | ||
752 | q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); | |
753 | if (!q->mq_debugfs_dir) | |
754 | goto err; | |
755 | ||
756 | queue_for_each_hw_ctx(q, hctx, i) { | |
757 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
758 | goto err; | |
759 | } | |
760 | ||
761 | return 0; | |
762 | ||
763 | err: | |
764 | blk_mq_debugfs_unregister_hctxs(q); | |
765 | return -ENOMEM; | |
766 | } | |
767 | ||
768 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) | |
769 | { | |
770 | debugfs_remove_recursive(q->mq_debugfs_dir); | |
771 | q->mq_debugfs_dir = NULL; | |
772 | } |