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 | } | |
91d68905 BVA |
63 | return 0; |
64 | } | |
65 | ||
66 | static const char *const blk_queue_flag_name[] = { | |
67 | [QUEUE_FLAG_QUEUED] = "QUEUED", | |
68 | [QUEUE_FLAG_STOPPED] = "STOPPED", | |
69 | [QUEUE_FLAG_SYNCFULL] = "SYNCFULL", | |
70 | [QUEUE_FLAG_ASYNCFULL] = "ASYNCFULL", | |
71 | [QUEUE_FLAG_DYING] = "DYING", | |
72 | [QUEUE_FLAG_BYPASS] = "BYPASS", | |
73 | [QUEUE_FLAG_BIDI] = "BIDI", | |
74 | [QUEUE_FLAG_NOMERGES] = "NOMERGES", | |
75 | [QUEUE_FLAG_SAME_COMP] = "SAME_COMP", | |
76 | [QUEUE_FLAG_FAIL_IO] = "FAIL_IO", | |
77 | [QUEUE_FLAG_STACKABLE] = "STACKABLE", | |
78 | [QUEUE_FLAG_NONROT] = "NONROT", | |
79 | [QUEUE_FLAG_IO_STAT] = "IO_STAT", | |
80 | [QUEUE_FLAG_DISCARD] = "DISCARD", | |
81 | [QUEUE_FLAG_NOXMERGES] = "NOXMERGES", | |
82 | [QUEUE_FLAG_ADD_RANDOM] = "ADD_RANDOM", | |
83 | [QUEUE_FLAG_SECERASE] = "SECERASE", | |
84 | [QUEUE_FLAG_SAME_FORCE] = "SAME_FORCE", | |
85 | [QUEUE_FLAG_DEAD] = "DEAD", | |
86 | [QUEUE_FLAG_INIT_DONE] = "INIT_DONE", | |
87 | [QUEUE_FLAG_NO_SG_MERGE] = "NO_SG_MERGE", | |
88 | [QUEUE_FLAG_POLL] = "POLL", | |
89 | [QUEUE_FLAG_WC] = "WC", | |
90 | [QUEUE_FLAG_FUA] = "FUA", | |
91 | [QUEUE_FLAG_FLUSH_NQ] = "FLUSH_NQ", | |
92 | [QUEUE_FLAG_DAX] = "DAX", | |
93 | [QUEUE_FLAG_STATS] = "STATS", | |
94 | [QUEUE_FLAG_POLL_STATS] = "POLL_STATS", | |
95 | [QUEUE_FLAG_REGISTERED] = "REGISTERED", | |
96 | }; | |
97 | ||
98 | static int blk_queue_flags_show(struct seq_file *m, void *v) | |
99 | { | |
100 | struct request_queue *q = m->private; | |
101 | ||
102 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
103 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 104 | seq_puts(m, "\n"); |
91d68905 BVA |
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 | ||
34dbad5d OS |
144 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
145 | { | |
146 | if (stat->nr_samples) { | |
147 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
148 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
149 | } else { | |
150 | seq_puts(m, "samples=0"); | |
151 | } | |
152 | } | |
153 | ||
154 | static int queue_poll_stat_show(struct seq_file *m, void *v) | |
155 | { | |
156 | struct request_queue *q = m->private; | |
0206319f | 157 | int bucket; |
34dbad5d | 158 | |
0206319f SB |
159 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
160 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
161 | print_stat(m, &q->poll_stat[2*bucket]); | |
162 | seq_puts(m, "\n"); | |
34dbad5d | 163 | |
0206319f SB |
164 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
165 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
166 | seq_puts(m, "\n"); | |
167 | } | |
34dbad5d OS |
168 | return 0; |
169 | } | |
170 | ||
171 | static int queue_poll_stat_open(struct inode *inode, struct file *file) | |
172 | { | |
173 | return single_open(file, queue_poll_stat_show, inode->i_private); | |
174 | } | |
175 | ||
176 | static const struct file_operations queue_poll_stat_fops = { | |
177 | .open = queue_poll_stat_open, | |
178 | .read = seq_read, | |
179 | .llseek = seq_lseek, | |
180 | .release = single_release, | |
181 | }; | |
182 | ||
f5c0b091 BVA |
183 | static const char *const hctx_state_name[] = { |
184 | [BLK_MQ_S_STOPPED] = "STOPPED", | |
185 | [BLK_MQ_S_TAG_ACTIVE] = "TAG_ACTIVE", | |
186 | [BLK_MQ_S_SCHED_RESTART] = "SCHED_RESTART", | |
187 | [BLK_MQ_S_TAG_WAITING] = "TAG_WAITING", | |
188 | ||
189 | }; | |
9abb2ad2 OS |
190 | static int hctx_state_show(struct seq_file *m, void *v) |
191 | { | |
192 | struct blk_mq_hw_ctx *hctx = m->private; | |
193 | ||
f5c0b091 BVA |
194 | blk_flags_show(m, hctx->state, hctx_state_name, |
195 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 196 | seq_puts(m, "\n"); |
9abb2ad2 OS |
197 | return 0; |
198 | } | |
199 | ||
200 | static int hctx_state_open(struct inode *inode, struct file *file) | |
201 | { | |
202 | return single_open(file, hctx_state_show, inode->i_private); | |
203 | } | |
204 | ||
205 | static const struct file_operations hctx_state_fops = { | |
206 | .open = hctx_state_open, | |
207 | .read = seq_read, | |
208 | .llseek = seq_lseek, | |
209 | .release = single_release, | |
210 | }; | |
211 | ||
f5c0b091 BVA |
212 | static const char *const alloc_policy_name[] = { |
213 | [BLK_TAG_ALLOC_FIFO] = "fifo", | |
214 | [BLK_TAG_ALLOC_RR] = "rr", | |
215 | }; | |
216 | ||
217 | static const char *const hctx_flag_name[] = { | |
218 | [ilog2(BLK_MQ_F_SHOULD_MERGE)] = "SHOULD_MERGE", | |
219 | [ilog2(BLK_MQ_F_TAG_SHARED)] = "TAG_SHARED", | |
220 | [ilog2(BLK_MQ_F_SG_MERGE)] = "SG_MERGE", | |
221 | [ilog2(BLK_MQ_F_BLOCKING)] = "BLOCKING", | |
222 | [ilog2(BLK_MQ_F_NO_SCHED)] = "NO_SCHED", | |
223 | }; | |
224 | ||
9abb2ad2 OS |
225 | static int hctx_flags_show(struct seq_file *m, void *v) |
226 | { | |
227 | struct blk_mq_hw_ctx *hctx = m->private; | |
f5c0b091 | 228 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 229 | |
f5c0b091 BVA |
230 | seq_puts(m, "alloc_policy="); |
231 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
232 | alloc_policy_name[alloc_policy]) | |
233 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
234 | else | |
235 | seq_printf(m, "%d", alloc_policy); | |
236 | seq_puts(m, " "); | |
237 | blk_flags_show(m, | |
238 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
239 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 240 | seq_puts(m, "\n"); |
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 | ||
8658dca8 BVA |
256 | static const char *const op_name[] = { |
257 | [REQ_OP_READ] = "READ", | |
258 | [REQ_OP_WRITE] = "WRITE", | |
259 | [REQ_OP_FLUSH] = "FLUSH", | |
260 | [REQ_OP_DISCARD] = "DISCARD", | |
261 | [REQ_OP_ZONE_REPORT] = "ZONE_REPORT", | |
262 | [REQ_OP_SECURE_ERASE] = "SECURE_ERASE", | |
263 | [REQ_OP_ZONE_RESET] = "ZONE_RESET", | |
264 | [REQ_OP_WRITE_SAME] = "WRITE_SAME", | |
265 | [REQ_OP_WRITE_ZEROES] = "WRITE_ZEROES", | |
266 | [REQ_OP_SCSI_IN] = "SCSI_IN", | |
267 | [REQ_OP_SCSI_OUT] = "SCSI_OUT", | |
268 | [REQ_OP_DRV_IN] = "DRV_IN", | |
269 | [REQ_OP_DRV_OUT] = "DRV_OUT", | |
270 | }; | |
271 | ||
272 | static const char *const cmd_flag_name[] = { | |
273 | [__REQ_FAILFAST_DEV] = "FAILFAST_DEV", | |
274 | [__REQ_FAILFAST_TRANSPORT] = "FAILFAST_TRANSPORT", | |
275 | [__REQ_FAILFAST_DRIVER] = "FAILFAST_DRIVER", | |
276 | [__REQ_SYNC] = "SYNC", | |
277 | [__REQ_META] = "META", | |
278 | [__REQ_PRIO] = "PRIO", | |
279 | [__REQ_NOMERGE] = "NOMERGE", | |
280 | [__REQ_IDLE] = "IDLE", | |
281 | [__REQ_INTEGRITY] = "INTEGRITY", | |
282 | [__REQ_FUA] = "FUA", | |
283 | [__REQ_PREFLUSH] = "PREFLUSH", | |
284 | [__REQ_RAHEAD] = "RAHEAD", | |
285 | [__REQ_BACKGROUND] = "BACKGROUND", | |
286 | [__REQ_NR_BITS] = "NR_BITS", | |
287 | }; | |
288 | ||
289 | static const char *const rqf_name[] = { | |
290 | [ilog2((__force u32)RQF_SORTED)] = "SORTED", | |
291 | [ilog2((__force u32)RQF_STARTED)] = "STARTED", | |
292 | [ilog2((__force u32)RQF_QUEUED)] = "QUEUED", | |
293 | [ilog2((__force u32)RQF_SOFTBARRIER)] = "SOFTBARRIER", | |
294 | [ilog2((__force u32)RQF_FLUSH_SEQ)] = "FLUSH_SEQ", | |
295 | [ilog2((__force u32)RQF_MIXED_MERGE)] = "MIXED_MERGE", | |
296 | [ilog2((__force u32)RQF_MQ_INFLIGHT)] = "MQ_INFLIGHT", | |
297 | [ilog2((__force u32)RQF_DONTPREP)] = "DONTPREP", | |
298 | [ilog2((__force u32)RQF_PREEMPT)] = "PREEMPT", | |
299 | [ilog2((__force u32)RQF_COPY_USER)] = "COPY_USER", | |
300 | [ilog2((__force u32)RQF_FAILED)] = "FAILED", | |
301 | [ilog2((__force u32)RQF_QUIET)] = "QUIET", | |
302 | [ilog2((__force u32)RQF_ELVPRIV)] = "ELVPRIV", | |
303 | [ilog2((__force u32)RQF_IO_STAT)] = "IO_STAT", | |
304 | [ilog2((__force u32)RQF_ALLOCED)] = "ALLOCED", | |
305 | [ilog2((__force u32)RQF_PM)] = "PM", | |
306 | [ilog2((__force u32)RQF_HASHED)] = "HASHED", | |
307 | [ilog2((__force u32)RQF_STATS)] = "STATS", | |
308 | [ilog2((__force u32)RQF_SPECIAL_PAYLOAD)] = "SPECIAL_PAYLOAD", | |
309 | }; | |
310 | ||
950cd7e9 OS |
311 | static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
312 | { | |
313 | struct request *rq = list_entry_rq(v); | |
8658dca8 | 314 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 315 | |
8658dca8 BVA |
316 | seq_printf(m, "%p {.op=", rq); |
317 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
318 | seq_printf(m, "%s", op_name[op]); | |
319 | else | |
320 | seq_printf(m, "%d", op); | |
321 | seq_puts(m, ", .cmd_flags="); | |
322 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
323 | ARRAY_SIZE(cmd_flag_name)); | |
324 | seq_puts(m, ", .rq_flags="); | |
325 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
326 | ARRAY_SIZE(rqf_name)); | |
327 | seq_printf(m, ", .tag=%d, .internal_tag=%d}\n", rq->tag, | |
328 | rq->internal_tag); | |
950cd7e9 OS |
329 | return 0; |
330 | } | |
331 | ||
332 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 333 | __acquires(&hctx->lock) |
950cd7e9 OS |
334 | { |
335 | struct blk_mq_hw_ctx *hctx = m->private; | |
336 | ||
337 | spin_lock(&hctx->lock); | |
338 | return seq_list_start(&hctx->dispatch, *pos); | |
339 | } | |
340 | ||
341 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
342 | { | |
343 | struct blk_mq_hw_ctx *hctx = m->private; | |
344 | ||
345 | return seq_list_next(v, &hctx->dispatch, pos); | |
346 | } | |
347 | ||
348 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 349 | __releases(&hctx->lock) |
950cd7e9 OS |
350 | { |
351 | struct blk_mq_hw_ctx *hctx = m->private; | |
352 | ||
353 | spin_unlock(&hctx->lock); | |
354 | } | |
355 | ||
356 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
357 | .start = hctx_dispatch_start, | |
358 | .next = hctx_dispatch_next, | |
359 | .stop = hctx_dispatch_stop, | |
360 | .show = blk_mq_debugfs_rq_show, | |
361 | }; | |
362 | ||
363 | static int hctx_dispatch_open(struct inode *inode, struct file *file) | |
364 | { | |
365 | return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); | |
366 | } | |
367 | ||
368 | static const struct file_operations hctx_dispatch_fops = { | |
369 | .open = hctx_dispatch_open, | |
370 | .read = seq_read, | |
371 | .llseek = seq_lseek, | |
372 | .release = seq_release, | |
373 | }; | |
374 | ||
0bfa5288 OS |
375 | static int hctx_ctx_map_show(struct seq_file *m, void *v) |
376 | { | |
377 | struct blk_mq_hw_ctx *hctx = m->private; | |
378 | ||
379 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static int hctx_ctx_map_open(struct inode *inode, struct file *file) | |
384 | { | |
385 | return single_open(file, hctx_ctx_map_show, inode->i_private); | |
386 | } | |
387 | ||
388 | static const struct file_operations hctx_ctx_map_fops = { | |
389 | .open = hctx_ctx_map_open, | |
390 | .read = seq_read, | |
391 | .llseek = seq_lseek, | |
392 | .release = single_release, | |
393 | }; | |
394 | ||
d96b37c0 OS |
395 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
396 | struct blk_mq_tags *tags) | |
397 | { | |
398 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
399 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
400 | seq_printf(m, "active_queues=%d\n", | |
401 | atomic_read(&tags->active_queues)); | |
402 | ||
403 | seq_puts(m, "\nbitmap_tags:\n"); | |
404 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
405 | ||
406 | if (tags->nr_reserved_tags) { | |
407 | seq_puts(m, "\nbreserved_tags:\n"); | |
408 | sbitmap_queue_show(&tags->breserved_tags, m); | |
409 | } | |
410 | } | |
411 | ||
412 | static int hctx_tags_show(struct seq_file *m, void *v) | |
413 | { | |
414 | struct blk_mq_hw_ctx *hctx = m->private; | |
415 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 416 | int res; |
d96b37c0 | 417 | |
8c0f14ea BVA |
418 | res = mutex_lock_interruptible(&q->sysfs_lock); |
419 | if (res) | |
420 | goto out; | |
d96b37c0 OS |
421 | if (hctx->tags) |
422 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
423 | mutex_unlock(&q->sysfs_lock); | |
424 | ||
8c0f14ea BVA |
425 | out: |
426 | return res; | |
d96b37c0 OS |
427 | } |
428 | ||
429 | static int hctx_tags_open(struct inode *inode, struct file *file) | |
430 | { | |
431 | return single_open(file, hctx_tags_show, inode->i_private); | |
432 | } | |
433 | ||
434 | static const struct file_operations hctx_tags_fops = { | |
435 | .open = hctx_tags_open, | |
436 | .read = seq_read, | |
437 | .llseek = seq_lseek, | |
438 | .release = single_release, | |
439 | }; | |
440 | ||
d7e3621a OS |
441 | static int hctx_tags_bitmap_show(struct seq_file *m, void *v) |
442 | { | |
443 | struct blk_mq_hw_ctx *hctx = m->private; | |
444 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 445 | int res; |
d7e3621a | 446 | |
8c0f14ea BVA |
447 | res = mutex_lock_interruptible(&q->sysfs_lock); |
448 | if (res) | |
449 | goto out; | |
d7e3621a OS |
450 | if (hctx->tags) |
451 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
452 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
453 | |
454 | out: | |
455 | return res; | |
d7e3621a OS |
456 | } |
457 | ||
458 | static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) | |
459 | { | |
460 | return single_open(file, hctx_tags_bitmap_show, inode->i_private); | |
461 | } | |
462 | ||
463 | static const struct file_operations hctx_tags_bitmap_fops = { | |
464 | .open = hctx_tags_bitmap_open, | |
465 | .read = seq_read, | |
466 | .llseek = seq_lseek, | |
467 | .release = single_release, | |
468 | }; | |
469 | ||
d96b37c0 OS |
470 | static int hctx_sched_tags_show(struct seq_file *m, void *v) |
471 | { | |
472 | struct blk_mq_hw_ctx *hctx = m->private; | |
473 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 474 | int res; |
d96b37c0 | 475 | |
8c0f14ea BVA |
476 | res = mutex_lock_interruptible(&q->sysfs_lock); |
477 | if (res) | |
478 | goto out; | |
d96b37c0 OS |
479 | if (hctx->sched_tags) |
480 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
481 | mutex_unlock(&q->sysfs_lock); | |
482 | ||
8c0f14ea BVA |
483 | out: |
484 | return res; | |
d96b37c0 OS |
485 | } |
486 | ||
487 | static int hctx_sched_tags_open(struct inode *inode, struct file *file) | |
488 | { | |
489 | return single_open(file, hctx_sched_tags_show, inode->i_private); | |
490 | } | |
491 | ||
492 | static const struct file_operations hctx_sched_tags_fops = { | |
493 | .open = hctx_sched_tags_open, | |
494 | .read = seq_read, | |
495 | .llseek = seq_lseek, | |
496 | .release = single_release, | |
497 | }; | |
498 | ||
d7e3621a OS |
499 | static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) |
500 | { | |
501 | struct blk_mq_hw_ctx *hctx = m->private; | |
502 | struct request_queue *q = hctx->queue; | |
8c0f14ea | 503 | int res; |
d7e3621a | 504 | |
8c0f14ea BVA |
505 | res = mutex_lock_interruptible(&q->sysfs_lock); |
506 | if (res) | |
507 | goto out; | |
d7e3621a OS |
508 | if (hctx->sched_tags) |
509 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
510 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
511 | |
512 | out: | |
513 | return res; | |
d7e3621a OS |
514 | } |
515 | ||
516 | static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) | |
517 | { | |
518 | return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); | |
519 | } | |
520 | ||
521 | static const struct file_operations hctx_sched_tags_bitmap_fops = { | |
522 | .open = hctx_sched_tags_bitmap_open, | |
523 | .read = seq_read, | |
524 | .llseek = seq_lseek, | |
525 | .release = single_release, | |
526 | }; | |
527 | ||
be215473 OS |
528 | static int hctx_io_poll_show(struct seq_file *m, void *v) |
529 | { | |
530 | struct blk_mq_hw_ctx *hctx = m->private; | |
531 | ||
532 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
533 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
534 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | static int hctx_io_poll_open(struct inode *inode, struct file *file) | |
539 | { | |
540 | return single_open(file, hctx_io_poll_show, inode->i_private); | |
541 | } | |
542 | ||
543 | static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, | |
544 | size_t count, loff_t *ppos) | |
545 | { | |
546 | struct seq_file *m = file->private_data; | |
547 | struct blk_mq_hw_ctx *hctx = m->private; | |
548 | ||
549 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
550 | return count; | |
551 | } | |
552 | ||
553 | static const struct file_operations hctx_io_poll_fops = { | |
554 | .open = hctx_io_poll_open, | |
555 | .read = seq_read, | |
556 | .write = hctx_io_poll_write, | |
557 | .llseek = seq_lseek, | |
558 | .release = single_release, | |
559 | }; | |
560 | ||
be215473 OS |
561 | static int hctx_dispatched_show(struct seq_file *m, void *v) |
562 | { | |
563 | struct blk_mq_hw_ctx *hctx = m->private; | |
564 | int i; | |
565 | ||
566 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
567 | ||
568 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
569 | unsigned int d = 1U << (i - 1); | |
570 | ||
571 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
572 | } | |
573 | ||
574 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | static int hctx_dispatched_open(struct inode *inode, struct file *file) | |
579 | { | |
580 | return single_open(file, hctx_dispatched_show, inode->i_private); | |
581 | } | |
582 | ||
583 | static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, | |
584 | size_t count, loff_t *ppos) | |
585 | { | |
586 | struct seq_file *m = file->private_data; | |
587 | struct blk_mq_hw_ctx *hctx = m->private; | |
588 | int i; | |
589 | ||
590 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
591 | hctx->dispatched[i] = 0; | |
592 | return count; | |
593 | } | |
594 | ||
595 | static const struct file_operations hctx_dispatched_fops = { | |
596 | .open = hctx_dispatched_open, | |
597 | .read = seq_read, | |
598 | .write = hctx_dispatched_write, | |
599 | .llseek = seq_lseek, | |
600 | .release = single_release, | |
601 | }; | |
602 | ||
4a46f05e OS |
603 | static int hctx_queued_show(struct seq_file *m, void *v) |
604 | { | |
605 | struct blk_mq_hw_ctx *hctx = m->private; | |
606 | ||
607 | seq_printf(m, "%lu\n", hctx->queued); | |
608 | return 0; | |
609 | } | |
610 | ||
611 | static int hctx_queued_open(struct inode *inode, struct file *file) | |
612 | { | |
613 | return single_open(file, hctx_queued_show, inode->i_private); | |
614 | } | |
615 | ||
616 | static ssize_t hctx_queued_write(struct file *file, const char __user *buf, | |
617 | size_t count, loff_t *ppos) | |
618 | { | |
619 | struct seq_file *m = file->private_data; | |
620 | struct blk_mq_hw_ctx *hctx = m->private; | |
621 | ||
622 | hctx->queued = 0; | |
623 | return count; | |
624 | } | |
625 | ||
626 | static const struct file_operations hctx_queued_fops = { | |
627 | .open = hctx_queued_open, | |
628 | .read = seq_read, | |
629 | .write = hctx_queued_write, | |
630 | .llseek = seq_lseek, | |
631 | .release = single_release, | |
632 | }; | |
633 | ||
634 | static int hctx_run_show(struct seq_file *m, void *v) | |
635 | { | |
636 | struct blk_mq_hw_ctx *hctx = m->private; | |
637 | ||
638 | seq_printf(m, "%lu\n", hctx->run); | |
639 | return 0; | |
640 | } | |
641 | ||
642 | static int hctx_run_open(struct inode *inode, struct file *file) | |
643 | { | |
644 | return single_open(file, hctx_run_show, inode->i_private); | |
645 | } | |
646 | ||
647 | static ssize_t hctx_run_write(struct file *file, const char __user *buf, | |
648 | size_t count, loff_t *ppos) | |
649 | { | |
650 | struct seq_file *m = file->private_data; | |
651 | struct blk_mq_hw_ctx *hctx = m->private; | |
652 | ||
653 | hctx->run = 0; | |
654 | return count; | |
655 | } | |
656 | ||
657 | static const struct file_operations hctx_run_fops = { | |
658 | .open = hctx_run_open, | |
659 | .read = seq_read, | |
660 | .write = hctx_run_write, | |
661 | .llseek = seq_lseek, | |
662 | .release = single_release, | |
663 | }; | |
664 | ||
665 | static int hctx_active_show(struct seq_file *m, void *v) | |
666 | { | |
667 | struct blk_mq_hw_ctx *hctx = m->private; | |
668 | ||
669 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int hctx_active_open(struct inode *inode, struct file *file) | |
674 | { | |
675 | return single_open(file, hctx_active_show, inode->i_private); | |
676 | } | |
677 | ||
678 | static const struct file_operations hctx_active_fops = { | |
679 | .open = hctx_active_open, | |
680 | .read = seq_read, | |
681 | .llseek = seq_lseek, | |
682 | .release = single_release, | |
683 | }; | |
684 | ||
950cd7e9 | 685 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 686 | __acquires(&ctx->lock) |
950cd7e9 OS |
687 | { |
688 | struct blk_mq_ctx *ctx = m->private; | |
689 | ||
690 | spin_lock(&ctx->lock); | |
691 | return seq_list_start(&ctx->rq_list, *pos); | |
692 | } | |
693 | ||
694 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
695 | { | |
696 | struct blk_mq_ctx *ctx = m->private; | |
697 | ||
698 | return seq_list_next(v, &ctx->rq_list, pos); | |
699 | } | |
700 | ||
701 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 702 | __releases(&ctx->lock) |
950cd7e9 OS |
703 | { |
704 | struct blk_mq_ctx *ctx = m->private; | |
705 | ||
706 | spin_unlock(&ctx->lock); | |
707 | } | |
708 | ||
709 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
710 | .start = ctx_rq_list_start, | |
711 | .next = ctx_rq_list_next, | |
712 | .stop = ctx_rq_list_stop, | |
713 | .show = blk_mq_debugfs_rq_show, | |
714 | }; | |
715 | ||
716 | static int ctx_rq_list_open(struct inode *inode, struct file *file) | |
717 | { | |
718 | return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); | |
719 | } | |
720 | ||
721 | static const struct file_operations ctx_rq_list_fops = { | |
722 | .open = ctx_rq_list_open, | |
723 | .read = seq_read, | |
724 | .llseek = seq_lseek, | |
725 | .release = seq_release, | |
726 | }; | |
727 | ||
4a46f05e OS |
728 | static int ctx_dispatched_show(struct seq_file *m, void *v) |
729 | { | |
730 | struct blk_mq_ctx *ctx = m->private; | |
731 | ||
732 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
733 | return 0; | |
734 | } | |
735 | ||
736 | static int ctx_dispatched_open(struct inode *inode, struct file *file) | |
737 | { | |
738 | return single_open(file, ctx_dispatched_show, inode->i_private); | |
739 | } | |
740 | ||
741 | static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, | |
742 | size_t count, loff_t *ppos) | |
743 | { | |
744 | struct seq_file *m = file->private_data; | |
745 | struct blk_mq_ctx *ctx = m->private; | |
746 | ||
747 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
748 | return count; | |
749 | } | |
750 | ||
751 | static const struct file_operations ctx_dispatched_fops = { | |
752 | .open = ctx_dispatched_open, | |
753 | .read = seq_read, | |
754 | .write = ctx_dispatched_write, | |
755 | .llseek = seq_lseek, | |
756 | .release = single_release, | |
757 | }; | |
758 | ||
759 | static int ctx_merged_show(struct seq_file *m, void *v) | |
760 | { | |
761 | struct blk_mq_ctx *ctx = m->private; | |
762 | ||
763 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
764 | return 0; | |
765 | } | |
766 | ||
767 | static int ctx_merged_open(struct inode *inode, struct file *file) | |
768 | { | |
769 | return single_open(file, ctx_merged_show, inode->i_private); | |
770 | } | |
771 | ||
772 | static ssize_t ctx_merged_write(struct file *file, const char __user *buf, | |
773 | size_t count, loff_t *ppos) | |
774 | { | |
775 | struct seq_file *m = file->private_data; | |
776 | struct blk_mq_ctx *ctx = m->private; | |
777 | ||
778 | ctx->rq_merged = 0; | |
779 | return count; | |
780 | } | |
781 | ||
782 | static const struct file_operations ctx_merged_fops = { | |
783 | .open = ctx_merged_open, | |
784 | .read = seq_read, | |
785 | .write = ctx_merged_write, | |
786 | .llseek = seq_lseek, | |
787 | .release = single_release, | |
788 | }; | |
789 | ||
790 | static int ctx_completed_show(struct seq_file *m, void *v) | |
791 | { | |
792 | struct blk_mq_ctx *ctx = m->private; | |
793 | ||
794 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
795 | return 0; | |
796 | } | |
797 | ||
798 | static int ctx_completed_open(struct inode *inode, struct file *file) | |
799 | { | |
800 | return single_open(file, ctx_completed_show, inode->i_private); | |
801 | } | |
802 | ||
803 | static ssize_t ctx_completed_write(struct file *file, const char __user *buf, | |
804 | size_t count, loff_t *ppos) | |
805 | { | |
806 | struct seq_file *m = file->private_data; | |
807 | struct blk_mq_ctx *ctx = m->private; | |
808 | ||
809 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
810 | return count; | |
811 | } | |
812 | ||
813 | static const struct file_operations ctx_completed_fops = { | |
814 | .open = ctx_completed_open, | |
815 | .read = seq_read, | |
816 | .write = ctx_completed_write, | |
817 | .llseek = seq_lseek, | |
818 | .release = single_release, | |
819 | }; | |
820 | ||
34dbad5d OS |
821 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
822 | {"poll_stat", 0400, &queue_poll_stat_fops}, | |
65ca1ca3 | 823 | {"state", 0600, &blk_queue_flags_fops}, |
34dbad5d OS |
824 | {}, |
825 | }; | |
826 | ||
07e4fead | 827 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
9abb2ad2 OS |
828 | {"state", 0400, &hctx_state_fops}, |
829 | {"flags", 0400, &hctx_flags_fops}, | |
950cd7e9 | 830 | {"dispatch", 0400, &hctx_dispatch_fops}, |
0bfa5288 | 831 | {"ctx_map", 0400, &hctx_ctx_map_fops}, |
d96b37c0 | 832 | {"tags", 0400, &hctx_tags_fops}, |
d7e3621a | 833 | {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, |
d96b37c0 | 834 | {"sched_tags", 0400, &hctx_sched_tags_fops}, |
d7e3621a | 835 | {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, |
be215473 | 836 | {"io_poll", 0600, &hctx_io_poll_fops}, |
be215473 | 837 | {"dispatched", 0600, &hctx_dispatched_fops}, |
4a46f05e OS |
838 | {"queued", 0600, &hctx_queued_fops}, |
839 | {"run", 0600, &hctx_run_fops}, | |
840 | {"active", 0400, &hctx_active_fops}, | |
72f2f8f6 | 841 | {}, |
07e4fead OS |
842 | }; |
843 | ||
844 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
950cd7e9 | 845 | {"rq_list", 0400, &ctx_rq_list_fops}, |
4a46f05e OS |
846 | {"dispatched", 0600, &ctx_dispatched_fops}, |
847 | {"merged", 0600, &ctx_merged_fops}, | |
848 | {"completed", 0600, &ctx_completed_fops}, | |
72f2f8f6 | 849 | {}, |
07e4fead OS |
850 | }; |
851 | ||
4c9e4019 | 852 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 853 | { |
18fbda91 | 854 | if (!blk_debugfs_root) |
07e4fead OS |
855 | return -ENOENT; |
856 | ||
4c9e4019 BVA |
857 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
858 | blk_debugfs_root); | |
07e4fead OS |
859 | if (!q->debugfs_dir) |
860 | goto err; | |
861 | ||
62d6c949 | 862 | if (blk_mq_debugfs_register_mq(q)) |
07e4fead OS |
863 | goto err; |
864 | ||
865 | return 0; | |
866 | ||
867 | err: | |
868 | blk_mq_debugfs_unregister(q); | |
869 | return -ENOMEM; | |
870 | } | |
871 | ||
872 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
873 | { | |
874 | debugfs_remove_recursive(q->debugfs_dir); | |
875 | q->mq_debugfs_dir = NULL; | |
876 | q->debugfs_dir = NULL; | |
877 | } | |
878 | ||
72f2f8f6 BVA |
879 | static bool debugfs_create_files(struct dentry *parent, void *data, |
880 | const struct blk_mq_debugfs_attr *attr) | |
881 | { | |
882 | for (; attr->name; attr++) { | |
883 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
884 | data, attr->fops)) | |
885 | return false; | |
886 | } | |
887 | return true; | |
888 | } | |
889 | ||
07e4fead OS |
890 | static int blk_mq_debugfs_register_ctx(struct request_queue *q, |
891 | struct blk_mq_ctx *ctx, | |
892 | struct dentry *hctx_dir) | |
893 | { | |
894 | struct dentry *ctx_dir; | |
895 | char name[20]; | |
07e4fead OS |
896 | |
897 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
898 | ctx_dir = debugfs_create_dir(name, hctx_dir); | |
899 | if (!ctx_dir) | |
900 | return -ENOMEM; | |
901 | ||
72f2f8f6 BVA |
902 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
903 | return -ENOMEM; | |
07e4fead OS |
904 | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static int blk_mq_debugfs_register_hctx(struct request_queue *q, | |
909 | struct blk_mq_hw_ctx *hctx) | |
910 | { | |
911 | struct blk_mq_ctx *ctx; | |
912 | struct dentry *hctx_dir; | |
913 | char name[20]; | |
914 | int i; | |
915 | ||
916 | snprintf(name, sizeof(name), "%u", hctx->queue_num); | |
917 | hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); | |
918 | if (!hctx_dir) | |
919 | return -ENOMEM; | |
920 | ||
72f2f8f6 BVA |
921 | if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs)) |
922 | return -ENOMEM; | |
07e4fead OS |
923 | |
924 | hctx_for_each_ctx(hctx, ctx, i) { | |
925 | if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) | |
926 | return -ENOMEM; | |
927 | } | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
62d6c949 | 932 | int blk_mq_debugfs_register_mq(struct request_queue *q) |
07e4fead OS |
933 | { |
934 | struct blk_mq_hw_ctx *hctx; | |
935 | int i; | |
936 | ||
937 | if (!q->debugfs_dir) | |
938 | return -ENOENT; | |
939 | ||
940 | q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); | |
941 | if (!q->mq_debugfs_dir) | |
942 | goto err; | |
943 | ||
34dbad5d OS |
944 | if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs)) |
945 | goto err; | |
946 | ||
07e4fead OS |
947 | queue_for_each_hw_ctx(q, hctx, i) { |
948 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
949 | goto err; | |
950 | } | |
951 | ||
952 | return 0; | |
953 | ||
954 | err: | |
62d6c949 | 955 | blk_mq_debugfs_unregister_mq(q); |
07e4fead OS |
956 | return -ENOMEM; |
957 | } | |
958 | ||
62d6c949 | 959 | void blk_mq_debugfs_unregister_mq(struct request_queue *q) |
07e4fead OS |
960 | { |
961 | debugfs_remove_recursive(q->mq_debugfs_dir); | |
962 | q->mq_debugfs_dir = NULL; | |
963 | } |