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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; | |
162 | ||
163 | seq_puts(m, "read: "); | |
164 | print_stat(m, &q->poll_stat[READ]); | |
165 | seq_puts(m, "\n"); | |
166 | ||
167 | seq_puts(m, "write: "); | |
168 | print_stat(m, &q->poll_stat[WRITE]); | |
169 | seq_puts(m, "\n"); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int queue_poll_stat_open(struct inode *inode, struct file *file) | |
174 | { | |
175 | return single_open(file, queue_poll_stat_show, inode->i_private); | |
176 | } | |
177 | ||
178 | static const struct file_operations queue_poll_stat_fops = { | |
179 | .open = queue_poll_stat_open, | |
180 | .read = seq_read, | |
181 | .llseek = seq_lseek, | |
182 | .release = single_release, | |
183 | }; | |
184 | ||
f5c0b091 BVA |
185 | static const char *const hctx_state_name[] = { |
186 | [BLK_MQ_S_STOPPED] = "STOPPED", | |
187 | [BLK_MQ_S_TAG_ACTIVE] = "TAG_ACTIVE", | |
188 | [BLK_MQ_S_SCHED_RESTART] = "SCHED_RESTART", | |
189 | [BLK_MQ_S_TAG_WAITING] = "TAG_WAITING", | |
190 | ||
191 | }; | |
9abb2ad2 OS |
192 | static int hctx_state_show(struct seq_file *m, void *v) |
193 | { | |
194 | struct blk_mq_hw_ctx *hctx = m->private; | |
195 | ||
f5c0b091 BVA |
196 | blk_flags_show(m, hctx->state, hctx_state_name, |
197 | ARRAY_SIZE(hctx_state_name)); | |
9abb2ad2 OS |
198 | return 0; |
199 | } | |
200 | ||
201 | static int hctx_state_open(struct inode *inode, struct file *file) | |
202 | { | |
203 | return single_open(file, hctx_state_show, inode->i_private); | |
204 | } | |
205 | ||
206 | static const struct file_operations hctx_state_fops = { | |
207 | .open = hctx_state_open, | |
208 | .read = seq_read, | |
209 | .llseek = seq_lseek, | |
210 | .release = single_release, | |
211 | }; | |
212 | ||
f5c0b091 BVA |
213 | static const char *const alloc_policy_name[] = { |
214 | [BLK_TAG_ALLOC_FIFO] = "fifo", | |
215 | [BLK_TAG_ALLOC_RR] = "rr", | |
216 | }; | |
217 | ||
218 | static const char *const hctx_flag_name[] = { | |
219 | [ilog2(BLK_MQ_F_SHOULD_MERGE)] = "SHOULD_MERGE", | |
220 | [ilog2(BLK_MQ_F_TAG_SHARED)] = "TAG_SHARED", | |
221 | [ilog2(BLK_MQ_F_SG_MERGE)] = "SG_MERGE", | |
222 | [ilog2(BLK_MQ_F_BLOCKING)] = "BLOCKING", | |
223 | [ilog2(BLK_MQ_F_NO_SCHED)] = "NO_SCHED", | |
224 | }; | |
225 | ||
9abb2ad2 OS |
226 | static int hctx_flags_show(struct seq_file *m, void *v) |
227 | { | |
228 | struct blk_mq_hw_ctx *hctx = m->private; | |
f5c0b091 | 229 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 230 | |
f5c0b091 BVA |
231 | seq_puts(m, "alloc_policy="); |
232 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
233 | alloc_policy_name[alloc_policy]) | |
234 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
235 | else | |
236 | seq_printf(m, "%d", alloc_policy); | |
237 | seq_puts(m, " "); | |
238 | blk_flags_show(m, | |
239 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
240 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
9abb2ad2 OS |
241 | return 0; |
242 | } | |
243 | ||
244 | static int hctx_flags_open(struct inode *inode, struct file *file) | |
245 | { | |
246 | return single_open(file, hctx_flags_show, inode->i_private); | |
247 | } | |
248 | ||
249 | static const struct file_operations hctx_flags_fops = { | |
250 | .open = hctx_flags_open, | |
251 | .read = seq_read, | |
252 | .llseek = seq_lseek, | |
253 | .release = single_release, | |
254 | }; | |
255 | ||
950cd7e9 OS |
256 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
257 | { | |
258 | struct request *rq = list_entry_rq(v); | |
259 | ||
aebf526b | 260 | seq_printf(m, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n", |
a1ae0f74 | 261 | rq, rq->cmd_flags, (__force unsigned int)rq->rq_flags, |
7b393852 | 262 | rq->tag, rq->internal_tag); |
950cd7e9 OS |
263 | return 0; |
264 | } | |
265 | ||
266 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 267 | __acquires(&hctx->lock) |
950cd7e9 OS |
268 | { |
269 | struct blk_mq_hw_ctx *hctx = m->private; | |
270 | ||
271 | spin_lock(&hctx->lock); | |
272 | return seq_list_start(&hctx->dispatch, *pos); | |
273 | } | |
274 | ||
275 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
276 | { | |
277 | struct blk_mq_hw_ctx *hctx = m->private; | |
278 | ||
279 | return seq_list_next(v, &hctx->dispatch, pos); | |
280 | } | |
281 | ||
282 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 283 | __releases(&hctx->lock) |
950cd7e9 OS |
284 | { |
285 | struct blk_mq_hw_ctx *hctx = m->private; | |
286 | ||
287 | spin_unlock(&hctx->lock); | |
288 | } | |
289 | ||
290 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
291 | .start = hctx_dispatch_start, | |
292 | .next = hctx_dispatch_next, | |
293 | .stop = hctx_dispatch_stop, | |
294 | .show = blk_mq_debugfs_rq_show, | |
295 | }; | |
296 | ||
297 | static int hctx_dispatch_open(struct inode *inode, struct file *file) | |
298 | { | |
299 | return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); | |
300 | } | |
301 | ||
302 | static const struct file_operations hctx_dispatch_fops = { | |
303 | .open = hctx_dispatch_open, | |
304 | .read = seq_read, | |
305 | .llseek = seq_lseek, | |
306 | .release = seq_release, | |
307 | }; | |
308 | ||
0bfa5288 OS |
309 | static int hctx_ctx_map_show(struct seq_file *m, void *v) |
310 | { | |
311 | struct blk_mq_hw_ctx *hctx = m->private; | |
312 | ||
313 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static int hctx_ctx_map_open(struct inode *inode, struct file *file) | |
318 | { | |
319 | return single_open(file, hctx_ctx_map_show, inode->i_private); | |
320 | } | |
321 | ||
322 | static const struct file_operations hctx_ctx_map_fops = { | |
323 | .open = hctx_ctx_map_open, | |
324 | .read = seq_read, | |
325 | .llseek = seq_lseek, | |
326 | .release = single_release, | |
327 | }; | |
328 | ||
d96b37c0 OS |
329 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
330 | struct blk_mq_tags *tags) | |
331 | { | |
332 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
333 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
334 | seq_printf(m, "active_queues=%d\n", | |
335 | atomic_read(&tags->active_queues)); | |
336 | ||
337 | seq_puts(m, "\nbitmap_tags:\n"); | |
338 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
339 | ||
340 | if (tags->nr_reserved_tags) { | |
341 | seq_puts(m, "\nbreserved_tags:\n"); | |
342 | sbitmap_queue_show(&tags->breserved_tags, m); | |
343 | } | |
344 | } | |
345 | ||
346 | static int hctx_tags_show(struct seq_file *m, void *v) | |
347 | { | |
348 | struct blk_mq_hw_ctx *hctx = m->private; | |
349 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 350 | int res; |
d96b37c0 | 351 | |
8c0f14ea BVA |
352 | res = mutex_lock_interruptible(&q->sysfs_lock); |
353 | if (res) | |
354 | goto out; | |
d96b37c0 OS |
355 | if (hctx->tags) |
356 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
357 | mutex_unlock(&q->sysfs_lock); | |
358 | ||
8c0f14ea BVA |
359 | out: |
360 | return res; | |
d96b37c0 OS |
361 | } |
362 | ||
363 | static int hctx_tags_open(struct inode *inode, struct file *file) | |
364 | { | |
365 | return single_open(file, hctx_tags_show, inode->i_private); | |
366 | } | |
367 | ||
368 | static const struct file_operations hctx_tags_fops = { | |
369 | .open = hctx_tags_open, | |
370 | .read = seq_read, | |
371 | .llseek = seq_lseek, | |
372 | .release = single_release, | |
373 | }; | |
374 | ||
d7e3621a OS |
375 | static int hctx_tags_bitmap_show(struct seq_file *m, void *v) |
376 | { | |
377 | struct blk_mq_hw_ctx *hctx = m->private; | |
378 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 379 | int res; |
d7e3621a | 380 | |
8c0f14ea BVA |
381 | res = mutex_lock_interruptible(&q->sysfs_lock); |
382 | if (res) | |
383 | goto out; | |
d7e3621a OS |
384 | if (hctx->tags) |
385 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
386 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
387 | |
388 | out: | |
389 | return res; | |
d7e3621a OS |
390 | } |
391 | ||
392 | static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) | |
393 | { | |
394 | return single_open(file, hctx_tags_bitmap_show, inode->i_private); | |
395 | } | |
396 | ||
397 | static const struct file_operations hctx_tags_bitmap_fops = { | |
398 | .open = hctx_tags_bitmap_open, | |
399 | .read = seq_read, | |
400 | .llseek = seq_lseek, | |
401 | .release = single_release, | |
402 | }; | |
403 | ||
d96b37c0 OS |
404 | static int hctx_sched_tags_show(struct seq_file *m, void *v) |
405 | { | |
406 | struct blk_mq_hw_ctx *hctx = m->private; | |
407 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 408 | int res; |
d96b37c0 | 409 | |
8c0f14ea BVA |
410 | res = mutex_lock_interruptible(&q->sysfs_lock); |
411 | if (res) | |
412 | goto out; | |
d96b37c0 OS |
413 | if (hctx->sched_tags) |
414 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
415 | mutex_unlock(&q->sysfs_lock); | |
416 | ||
8c0f14ea BVA |
417 | out: |
418 | return res; | |
d96b37c0 OS |
419 | } |
420 | ||
421 | static int hctx_sched_tags_open(struct inode *inode, struct file *file) | |
422 | { | |
423 | return single_open(file, hctx_sched_tags_show, inode->i_private); | |
424 | } | |
425 | ||
426 | static const struct file_operations hctx_sched_tags_fops = { | |
427 | .open = hctx_sched_tags_open, | |
428 | .read = seq_read, | |
429 | .llseek = seq_lseek, | |
430 | .release = single_release, | |
431 | }; | |
432 | ||
d7e3621a OS |
433 | static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) |
434 | { | |
435 | struct blk_mq_hw_ctx *hctx = m->private; | |
436 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 437 | int res; |
d7e3621a | 438 | |
8c0f14ea BVA |
439 | res = mutex_lock_interruptible(&q->sysfs_lock); |
440 | if (res) | |
441 | goto out; | |
d7e3621a OS |
442 | if (hctx->sched_tags) |
443 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
444 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
445 | |
446 | out: | |
447 | return res; | |
d7e3621a OS |
448 | } |
449 | ||
450 | static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) | |
451 | { | |
452 | return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); | |
453 | } | |
454 | ||
455 | static const struct file_operations hctx_sched_tags_bitmap_fops = { | |
456 | .open = hctx_sched_tags_bitmap_open, | |
457 | .read = seq_read, | |
458 | .llseek = seq_lseek, | |
459 | .release = single_release, | |
460 | }; | |
461 | ||
be215473 OS |
462 | static int hctx_io_poll_show(struct seq_file *m, void *v) |
463 | { | |
464 | struct blk_mq_hw_ctx *hctx = m->private; | |
465 | ||
466 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
467 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
468 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | static int hctx_io_poll_open(struct inode *inode, struct file *file) | |
473 | { | |
474 | return single_open(file, hctx_io_poll_show, inode->i_private); | |
475 | } | |
476 | ||
477 | static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, | |
478 | size_t count, loff_t *ppos) | |
479 | { | |
480 | struct seq_file *m = file->private_data; | |
481 | struct blk_mq_hw_ctx *hctx = m->private; | |
482 | ||
483 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
484 | return count; | |
485 | } | |
486 | ||
487 | static const struct file_operations hctx_io_poll_fops = { | |
488 | .open = hctx_io_poll_open, | |
489 | .read = seq_read, | |
490 | .write = hctx_io_poll_write, | |
491 | .llseek = seq_lseek, | |
492 | .release = single_release, | |
493 | }; | |
494 | ||
be215473 OS |
495 | static int hctx_dispatched_show(struct seq_file *m, void *v) |
496 | { | |
497 | struct blk_mq_hw_ctx *hctx = m->private; | |
498 | int i; | |
499 | ||
500 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
501 | ||
502 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
503 | unsigned int d = 1U << (i - 1); | |
504 | ||
505 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
506 | } | |
507 | ||
508 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static int hctx_dispatched_open(struct inode *inode, struct file *file) | |
513 | { | |
514 | return single_open(file, hctx_dispatched_show, inode->i_private); | |
515 | } | |
516 | ||
517 | static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, | |
518 | size_t count, loff_t *ppos) | |
519 | { | |
520 | struct seq_file *m = file->private_data; | |
521 | struct blk_mq_hw_ctx *hctx = m->private; | |
522 | int i; | |
523 | ||
524 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
525 | hctx->dispatched[i] = 0; | |
526 | return count; | |
527 | } | |
528 | ||
529 | static const struct file_operations hctx_dispatched_fops = { | |
530 | .open = hctx_dispatched_open, | |
531 | .read = seq_read, | |
532 | .write = hctx_dispatched_write, | |
533 | .llseek = seq_lseek, | |
534 | .release = single_release, | |
535 | }; | |
536 | ||
4a46f05e OS |
537 | static int hctx_queued_show(struct seq_file *m, void *v) |
538 | { | |
539 | struct blk_mq_hw_ctx *hctx = m->private; | |
540 | ||
541 | seq_printf(m, "%lu\n", hctx->queued); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | static int hctx_queued_open(struct inode *inode, struct file *file) | |
546 | { | |
547 | return single_open(file, hctx_queued_show, inode->i_private); | |
548 | } | |
549 | ||
550 | static ssize_t hctx_queued_write(struct file *file, const char __user *buf, | |
551 | size_t count, loff_t *ppos) | |
552 | { | |
553 | struct seq_file *m = file->private_data; | |
554 | struct blk_mq_hw_ctx *hctx = m->private; | |
555 | ||
556 | hctx->queued = 0; | |
557 | return count; | |
558 | } | |
559 | ||
560 | static const struct file_operations hctx_queued_fops = { | |
561 | .open = hctx_queued_open, | |
562 | .read = seq_read, | |
563 | .write = hctx_queued_write, | |
564 | .llseek = seq_lseek, | |
565 | .release = single_release, | |
566 | }; | |
567 | ||
568 | static int hctx_run_show(struct seq_file *m, void *v) | |
569 | { | |
570 | struct blk_mq_hw_ctx *hctx = m->private; | |
571 | ||
572 | seq_printf(m, "%lu\n", hctx->run); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | static int hctx_run_open(struct inode *inode, struct file *file) | |
577 | { | |
578 | return single_open(file, hctx_run_show, inode->i_private); | |
579 | } | |
580 | ||
581 | static ssize_t hctx_run_write(struct file *file, const char __user *buf, | |
582 | size_t count, loff_t *ppos) | |
583 | { | |
584 | struct seq_file *m = file->private_data; | |
585 | struct blk_mq_hw_ctx *hctx = m->private; | |
586 | ||
587 | hctx->run = 0; | |
588 | return count; | |
589 | } | |
590 | ||
591 | static const struct file_operations hctx_run_fops = { | |
592 | .open = hctx_run_open, | |
593 | .read = seq_read, | |
594 | .write = hctx_run_write, | |
595 | .llseek = seq_lseek, | |
596 | .release = single_release, | |
597 | }; | |
598 | ||
599 | static int hctx_active_show(struct seq_file *m, void *v) | |
600 | { | |
601 | struct blk_mq_hw_ctx *hctx = m->private; | |
602 | ||
603 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
604 | return 0; | |
605 | } | |
606 | ||
607 | static int hctx_active_open(struct inode *inode, struct file *file) | |
608 | { | |
609 | return single_open(file, hctx_active_show, inode->i_private); | |
610 | } | |
611 | ||
612 | static const struct file_operations hctx_active_fops = { | |
613 | .open = hctx_active_open, | |
614 | .read = seq_read, | |
615 | .llseek = seq_lseek, | |
616 | .release = single_release, | |
617 | }; | |
618 | ||
950cd7e9 | 619 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 620 | __acquires(&ctx->lock) |
950cd7e9 OS |
621 | { |
622 | struct blk_mq_ctx *ctx = m->private; | |
623 | ||
624 | spin_lock(&ctx->lock); | |
625 | return seq_list_start(&ctx->rq_list, *pos); | |
626 | } | |
627 | ||
628 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
629 | { | |
630 | struct blk_mq_ctx *ctx = m->private; | |
631 | ||
632 | return seq_list_next(v, &ctx->rq_list, pos); | |
633 | } | |
634 | ||
635 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 636 | __releases(&ctx->lock) |
950cd7e9 OS |
637 | { |
638 | struct blk_mq_ctx *ctx = m->private; | |
639 | ||
640 | spin_unlock(&ctx->lock); | |
641 | } | |
642 | ||
643 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
644 | .start = ctx_rq_list_start, | |
645 | .next = ctx_rq_list_next, | |
646 | .stop = ctx_rq_list_stop, | |
647 | .show = blk_mq_debugfs_rq_show, | |
648 | }; | |
649 | ||
650 | static int ctx_rq_list_open(struct inode *inode, struct file *file) | |
651 | { | |
652 | return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); | |
653 | } | |
654 | ||
655 | static const struct file_operations ctx_rq_list_fops = { | |
656 | .open = ctx_rq_list_open, | |
657 | .read = seq_read, | |
658 | .llseek = seq_lseek, | |
659 | .release = seq_release, | |
660 | }; | |
661 | ||
4a46f05e OS |
662 | static int ctx_dispatched_show(struct seq_file *m, void *v) |
663 | { | |
664 | struct blk_mq_ctx *ctx = m->private; | |
665 | ||
666 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
667 | return 0; | |
668 | } | |
669 | ||
670 | static int ctx_dispatched_open(struct inode *inode, struct file *file) | |
671 | { | |
672 | return single_open(file, ctx_dispatched_show, inode->i_private); | |
673 | } | |
674 | ||
675 | static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, | |
676 | size_t count, loff_t *ppos) | |
677 | { | |
678 | struct seq_file *m = file->private_data; | |
679 | struct blk_mq_ctx *ctx = m->private; | |
680 | ||
681 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
682 | return count; | |
683 | } | |
684 | ||
685 | static const struct file_operations ctx_dispatched_fops = { | |
686 | .open = ctx_dispatched_open, | |
687 | .read = seq_read, | |
688 | .write = ctx_dispatched_write, | |
689 | .llseek = seq_lseek, | |
690 | .release = single_release, | |
691 | }; | |
692 | ||
693 | static int ctx_merged_show(struct seq_file *m, void *v) | |
694 | { | |
695 | struct blk_mq_ctx *ctx = m->private; | |
696 | ||
697 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | static int ctx_merged_open(struct inode *inode, struct file *file) | |
702 | { | |
703 | return single_open(file, ctx_merged_show, inode->i_private); | |
704 | } | |
705 | ||
706 | static ssize_t ctx_merged_write(struct file *file, const char __user *buf, | |
707 | size_t count, loff_t *ppos) | |
708 | { | |
709 | struct seq_file *m = file->private_data; | |
710 | struct blk_mq_ctx *ctx = m->private; | |
711 | ||
712 | ctx->rq_merged = 0; | |
713 | return count; | |
714 | } | |
715 | ||
716 | static const struct file_operations ctx_merged_fops = { | |
717 | .open = ctx_merged_open, | |
718 | .read = seq_read, | |
719 | .write = ctx_merged_write, | |
720 | .llseek = seq_lseek, | |
721 | .release = single_release, | |
722 | }; | |
723 | ||
724 | static int ctx_completed_show(struct seq_file *m, void *v) | |
725 | { | |
726 | struct blk_mq_ctx *ctx = m->private; | |
727 | ||
728 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static int ctx_completed_open(struct inode *inode, struct file *file) | |
733 | { | |
734 | return single_open(file, ctx_completed_show, inode->i_private); | |
735 | } | |
736 | ||
737 | static ssize_t ctx_completed_write(struct file *file, const char __user *buf, | |
738 | size_t count, loff_t *ppos) | |
739 | { | |
740 | struct seq_file *m = file->private_data; | |
741 | struct blk_mq_ctx *ctx = m->private; | |
742 | ||
743 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
744 | return count; | |
745 | } | |
746 | ||
747 | static const struct file_operations ctx_completed_fops = { | |
748 | .open = ctx_completed_open, | |
749 | .read = seq_read, | |
750 | .write = ctx_completed_write, | |
751 | .llseek = seq_lseek, | |
752 | .release = single_release, | |
753 | }; | |
754 | ||
34dbad5d OS |
755 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
756 | {"poll_stat", 0400, &queue_poll_stat_fops}, | |
757 | {}, | |
758 | }; | |
759 | ||
07e4fead | 760 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
9abb2ad2 OS |
761 | {"state", 0400, &hctx_state_fops}, |
762 | {"flags", 0400, &hctx_flags_fops}, | |
950cd7e9 | 763 | {"dispatch", 0400, &hctx_dispatch_fops}, |
0bfa5288 | 764 | {"ctx_map", 0400, &hctx_ctx_map_fops}, |
d96b37c0 | 765 | {"tags", 0400, &hctx_tags_fops}, |
d7e3621a | 766 | {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, |
d96b37c0 | 767 | {"sched_tags", 0400, &hctx_sched_tags_fops}, |
d7e3621a | 768 | {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, |
be215473 | 769 | {"io_poll", 0600, &hctx_io_poll_fops}, |
be215473 | 770 | {"dispatched", 0600, &hctx_dispatched_fops}, |
4a46f05e OS |
771 | {"queued", 0600, &hctx_queued_fops}, |
772 | {"run", 0600, &hctx_run_fops}, | |
773 | {"active", 0400, &hctx_active_fops}, | |
72f2f8f6 | 774 | {}, |
07e4fead OS |
775 | }; |
776 | ||
777 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
950cd7e9 | 778 | {"rq_list", 0400, &ctx_rq_list_fops}, |
4a46f05e OS |
779 | {"dispatched", 0600, &ctx_dispatched_fops}, |
780 | {"merged", 0600, &ctx_merged_fops}, | |
781 | {"completed", 0600, &ctx_completed_fops}, | |
72f2f8f6 | 782 | {}, |
07e4fead OS |
783 | }; |
784 | ||
785 | int blk_mq_debugfs_register(struct request_queue *q, const char *name) | |
786 | { | |
18fbda91 | 787 | if (!blk_debugfs_root) |
07e4fead OS |
788 | return -ENOENT; |
789 | ||
18fbda91 | 790 | q->debugfs_dir = debugfs_create_dir(name, blk_debugfs_root); |
07e4fead OS |
791 | if (!q->debugfs_dir) |
792 | goto err; | |
793 | ||
794 | if (blk_mq_debugfs_register_hctxs(q)) | |
795 | goto err; | |
796 | ||
797 | return 0; | |
798 | ||
799 | err: | |
800 | blk_mq_debugfs_unregister(q); | |
801 | return -ENOMEM; | |
802 | } | |
803 | ||
804 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
805 | { | |
806 | debugfs_remove_recursive(q->debugfs_dir); | |
807 | q->mq_debugfs_dir = NULL; | |
808 | q->debugfs_dir = NULL; | |
809 | } | |
810 | ||
72f2f8f6 BVA |
811 | static bool debugfs_create_files(struct dentry *parent, void *data, |
812 | const struct blk_mq_debugfs_attr *attr) | |
813 | { | |
814 | for (; attr->name; attr++) { | |
815 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
816 | data, attr->fops)) | |
817 | return false; | |
818 | } | |
819 | return true; | |
820 | } | |
821 | ||
07e4fead OS |
822 | static int blk_mq_debugfs_register_ctx(struct request_queue *q, |
823 | struct blk_mq_ctx *ctx, | |
824 | struct dentry *hctx_dir) | |
825 | { | |
826 | struct dentry *ctx_dir; | |
827 | char name[20]; | |
07e4fead OS |
828 | |
829 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
830 | ctx_dir = debugfs_create_dir(name, hctx_dir); | |
831 | if (!ctx_dir) | |
832 | return -ENOMEM; | |
833 | ||
72f2f8f6 BVA |
834 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
835 | return -ENOMEM; | |
07e4fead OS |
836 | |
837 | return 0; | |
838 | } | |
839 | ||
840 | static int blk_mq_debugfs_register_hctx(struct request_queue *q, | |
841 | struct blk_mq_hw_ctx *hctx) | |
842 | { | |
843 | struct blk_mq_ctx *ctx; | |
844 | struct dentry *hctx_dir; | |
845 | char name[20]; | |
846 | int i; | |
847 | ||
848 | snprintf(name, sizeof(name), "%u", hctx->queue_num); | |
849 | hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); | |
850 | if (!hctx_dir) | |
851 | return -ENOMEM; | |
852 | ||
72f2f8f6 BVA |
853 | if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) |
854 | return -ENOMEM; | |
07e4fead OS |
855 | |
856 | hctx_for_each_ctx(hctx, ctx, i) { | |
857 | if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) | |
858 | return -ENOMEM; | |
859 | } | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
864 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) | |
865 | { | |
866 | struct blk_mq_hw_ctx *hctx; | |
867 | int i; | |
868 | ||
869 | if (!q->debugfs_dir) | |
870 | return -ENOENT; | |
871 | ||
91d68905 BVA |
872 | if (!debugfs_create_files(q->debugfs_dir, q, blk_queue_attrs)) |
873 | goto err; | |
874 | ||
07e4fead OS |
875 | q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); |
876 | if (!q->mq_debugfs_dir) | |
877 | goto err; | |
878 | ||
34dbad5d OS |
879 | if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs)) |
880 | goto err; | |
881 | ||
07e4fead OS |
882 | queue_for_each_hw_ctx(q, hctx, i) { |
883 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
884 | goto err; | |
885 | } | |
886 | ||
887 | return 0; | |
888 | ||
889 | err: | |
890 | blk_mq_debugfs_unregister_hctxs(q); | |
891 | return -ENOMEM; | |
892 | } | |
893 | ||
894 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) | |
895 | { | |
896 | debugfs_remove_recursive(q->mq_debugfs_dir); | |
897 | q->mq_debugfs_dir = NULL; | |
898 | } |