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320ae51f JA |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/backing-dev.h> | |
4 | #include <linux/bio.h> | |
5 | #include <linux/blkdev.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/workqueue.h> | |
10 | #include <linux/smp.h> | |
11 | ||
12 | #include <linux/blk-mq.h> | |
13 | #include "blk-mq.h" | |
14 | #include "blk-mq-tag.h" | |
15 | ||
16 | static void blk_mq_sysfs_release(struct kobject *kobj) | |
17 | { | |
76d697d1 ML |
18 | struct request_queue *q; |
19 | ||
20 | q = container_of(kobj, struct request_queue, mq_kobj); | |
21 | free_percpu(q->queue_ctx); | |
22 | } | |
23 | ||
24 | static void blk_mq_ctx_release(struct kobject *kobj) | |
25 | { | |
26 | struct blk_mq_ctx *ctx; | |
27 | ||
28 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
29 | kobject_put(&ctx->queue->mq_kobj); | |
30 | } | |
31 | ||
32 | static void blk_mq_hctx_release(struct kobject *kobj) | |
33 | { | |
34 | struct blk_mq_hw_ctx *hctx; | |
35 | ||
36 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
37 | kfree(hctx); | |
320ae51f JA |
38 | } |
39 | ||
40 | struct blk_mq_ctx_sysfs_entry { | |
41 | struct attribute attr; | |
42 | ssize_t (*show)(struct blk_mq_ctx *, char *); | |
43 | ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); | |
44 | }; | |
45 | ||
46 | struct blk_mq_hw_ctx_sysfs_entry { | |
47 | struct attribute attr; | |
48 | ssize_t (*show)(struct blk_mq_hw_ctx *, char *); | |
49 | ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); | |
50 | }; | |
51 | ||
52 | static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, | |
53 | char *page) | |
54 | { | |
55 | struct blk_mq_ctx_sysfs_entry *entry; | |
56 | struct blk_mq_ctx *ctx; | |
57 | struct request_queue *q; | |
58 | ssize_t res; | |
59 | ||
60 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
61 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
62 | q = ctx->queue; | |
63 | ||
64 | if (!entry->show) | |
65 | return -EIO; | |
66 | ||
67 | res = -ENOENT; | |
68 | mutex_lock(&q->sysfs_lock); | |
69 | if (!blk_queue_dying(q)) | |
70 | res = entry->show(ctx, page); | |
71 | mutex_unlock(&q->sysfs_lock); | |
72 | return res; | |
73 | } | |
74 | ||
75 | static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
76 | const char *page, size_t length) | |
77 | { | |
78 | struct blk_mq_ctx_sysfs_entry *entry; | |
79 | struct blk_mq_ctx *ctx; | |
80 | struct request_queue *q; | |
81 | ssize_t res; | |
82 | ||
83 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
84 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
85 | q = ctx->queue; | |
86 | ||
87 | if (!entry->store) | |
88 | return -EIO; | |
89 | ||
90 | res = -ENOENT; | |
91 | mutex_lock(&q->sysfs_lock); | |
92 | if (!blk_queue_dying(q)) | |
93 | res = entry->store(ctx, page, length); | |
94 | mutex_unlock(&q->sysfs_lock); | |
95 | return res; | |
96 | } | |
97 | ||
98 | static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, | |
99 | struct attribute *attr, char *page) | |
100 | { | |
101 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
102 | struct blk_mq_hw_ctx *hctx; | |
103 | struct request_queue *q; | |
104 | ssize_t res; | |
105 | ||
106 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
107 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
108 | q = hctx->queue; | |
109 | ||
110 | if (!entry->show) | |
111 | return -EIO; | |
112 | ||
113 | res = -ENOENT; | |
114 | mutex_lock(&q->sysfs_lock); | |
115 | if (!blk_queue_dying(q)) | |
116 | res = entry->show(hctx, page); | |
117 | mutex_unlock(&q->sysfs_lock); | |
118 | return res; | |
119 | } | |
120 | ||
121 | static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, | |
122 | struct attribute *attr, const char *page, | |
123 | size_t length) | |
124 | { | |
125 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
126 | struct blk_mq_hw_ctx *hctx; | |
127 | struct request_queue *q; | |
128 | ssize_t res; | |
129 | ||
130 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
131 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
132 | q = hctx->queue; | |
133 | ||
134 | if (!entry->store) | |
135 | return -EIO; | |
136 | ||
137 | res = -ENOENT; | |
138 | mutex_lock(&q->sysfs_lock); | |
139 | if (!blk_queue_dying(q)) | |
140 | res = entry->store(hctx, page, length); | |
141 | mutex_unlock(&q->sysfs_lock); | |
142 | return res; | |
143 | } | |
144 | ||
145 | static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page) | |
146 | { | |
147 | return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1], | |
148 | ctx->rq_dispatched[0]); | |
149 | } | |
150 | ||
151 | static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page) | |
152 | { | |
153 | return sprintf(page, "%lu\n", ctx->rq_merged); | |
154 | } | |
155 | ||
156 | static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page) | |
157 | { | |
158 | return sprintf(page, "%lu %lu\n", ctx->rq_completed[1], | |
159 | ctx->rq_completed[0]); | |
160 | } | |
161 | ||
162 | static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg) | |
163 | { | |
164 | char *start_page = page; | |
165 | struct request *rq; | |
166 | ||
167 | page += sprintf(page, "%s:\n", msg); | |
168 | ||
169 | list_for_each_entry(rq, list, queuelist) | |
170 | page += sprintf(page, "\t%p\n", rq); | |
171 | ||
172 | return page - start_page; | |
173 | } | |
174 | ||
175 | static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page) | |
176 | { | |
177 | ssize_t ret; | |
178 | ||
179 | spin_lock(&ctx->lock); | |
180 | ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending"); | |
181 | spin_unlock(&ctx->lock); | |
182 | ||
183 | return ret; | |
184 | } | |
185 | ||
186 | static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx, | |
187 | char *page) | |
188 | { | |
189 | return sprintf(page, "%lu\n", hctx->queued); | |
190 | } | |
191 | ||
192 | static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page) | |
193 | { | |
194 | return sprintf(page, "%lu\n", hctx->run); | |
195 | } | |
196 | ||
197 | static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx, | |
198 | char *page) | |
199 | { | |
200 | char *start_page = page; | |
201 | int i; | |
202 | ||
203 | page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
204 | ||
205 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) { | |
206 | unsigned long d = 1U << (i - 1); | |
207 | ||
208 | page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]); | |
209 | } | |
210 | ||
211 | return page - start_page; | |
212 | } | |
213 | ||
214 | static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx, | |
215 | char *page) | |
216 | { | |
217 | ssize_t ret; | |
218 | ||
219 | spin_lock(&hctx->lock); | |
220 | ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending"); | |
221 | spin_unlock(&hctx->lock); | |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
320ae51f JA |
226 | static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page) |
227 | { | |
228 | return blk_mq_tag_sysfs_show(hctx->tags, page); | |
229 | } | |
230 | ||
0d2602ca JA |
231 | static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page) |
232 | { | |
233 | return sprintf(page, "%u\n", atomic_read(&hctx->nr_active)); | |
234 | } | |
235 | ||
676141e4 JA |
236 | static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) |
237 | { | |
cb2da43e | 238 | unsigned int i, first = 1; |
676141e4 JA |
239 | ssize_t ret = 0; |
240 | ||
241 | blk_mq_disable_hotplug(); | |
242 | ||
cb2da43e | 243 | for_each_cpu(i, hctx->cpumask) { |
676141e4 JA |
244 | if (first) |
245 | ret += sprintf(ret + page, "%u", i); | |
246 | else | |
247 | ret += sprintf(ret + page, ", %u", i); | |
248 | ||
249 | first = 0; | |
250 | } | |
251 | ||
252 | blk_mq_enable_hotplug(); | |
253 | ||
254 | ret += sprintf(ret + page, "\n"); | |
255 | return ret; | |
256 | } | |
257 | ||
320ae51f JA |
258 | static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = { |
259 | .attr = {.name = "dispatched", .mode = S_IRUGO }, | |
260 | .show = blk_mq_sysfs_dispatched_show, | |
261 | }; | |
262 | static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = { | |
263 | .attr = {.name = "merged", .mode = S_IRUGO }, | |
264 | .show = blk_mq_sysfs_merged_show, | |
265 | }; | |
266 | static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = { | |
267 | .attr = {.name = "completed", .mode = S_IRUGO }, | |
268 | .show = blk_mq_sysfs_completed_show, | |
269 | }; | |
270 | static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = { | |
271 | .attr = {.name = "rq_list", .mode = S_IRUGO }, | |
272 | .show = blk_mq_sysfs_rq_list_show, | |
273 | }; | |
274 | ||
275 | static struct attribute *default_ctx_attrs[] = { | |
276 | &blk_mq_sysfs_dispatched.attr, | |
277 | &blk_mq_sysfs_merged.attr, | |
278 | &blk_mq_sysfs_completed.attr, | |
279 | &blk_mq_sysfs_rq_list.attr, | |
280 | NULL, | |
281 | }; | |
282 | ||
283 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = { | |
284 | .attr = {.name = "queued", .mode = S_IRUGO }, | |
285 | .show = blk_mq_hw_sysfs_queued_show, | |
286 | }; | |
287 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = { | |
288 | .attr = {.name = "run", .mode = S_IRUGO }, | |
289 | .show = blk_mq_hw_sysfs_run_show, | |
290 | }; | |
291 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = { | |
292 | .attr = {.name = "dispatched", .mode = S_IRUGO }, | |
293 | .show = blk_mq_hw_sysfs_dispatched_show, | |
294 | }; | |
0d2602ca JA |
295 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = { |
296 | .attr = {.name = "active", .mode = S_IRUGO }, | |
297 | .show = blk_mq_hw_sysfs_active_show, | |
298 | }; | |
320ae51f JA |
299 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = { |
300 | .attr = {.name = "pending", .mode = S_IRUGO }, | |
301 | .show = blk_mq_hw_sysfs_rq_list_show, | |
302 | }; | |
320ae51f JA |
303 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = { |
304 | .attr = {.name = "tags", .mode = S_IRUGO }, | |
305 | .show = blk_mq_hw_sysfs_tags_show, | |
306 | }; | |
676141e4 JA |
307 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
308 | .attr = {.name = "cpu_list", .mode = S_IRUGO }, | |
309 | .show = blk_mq_hw_sysfs_cpus_show, | |
310 | }; | |
320ae51f JA |
311 | |
312 | static struct attribute *default_hw_ctx_attrs[] = { | |
313 | &blk_mq_hw_sysfs_queued.attr, | |
314 | &blk_mq_hw_sysfs_run.attr, | |
315 | &blk_mq_hw_sysfs_dispatched.attr, | |
316 | &blk_mq_hw_sysfs_pending.attr, | |
320ae51f | 317 | &blk_mq_hw_sysfs_tags.attr, |
676141e4 | 318 | &blk_mq_hw_sysfs_cpus.attr, |
0d2602ca | 319 | &blk_mq_hw_sysfs_active.attr, |
320ae51f JA |
320 | NULL, |
321 | }; | |
322 | ||
323 | static const struct sysfs_ops blk_mq_sysfs_ops = { | |
324 | .show = blk_mq_sysfs_show, | |
325 | .store = blk_mq_sysfs_store, | |
326 | }; | |
327 | ||
328 | static const struct sysfs_ops blk_mq_hw_sysfs_ops = { | |
329 | .show = blk_mq_hw_sysfs_show, | |
330 | .store = blk_mq_hw_sysfs_store, | |
331 | }; | |
332 | ||
333 | static struct kobj_type blk_mq_ktype = { | |
334 | .sysfs_ops = &blk_mq_sysfs_ops, | |
335 | .release = blk_mq_sysfs_release, | |
336 | }; | |
337 | ||
338 | static struct kobj_type blk_mq_ctx_ktype = { | |
339 | .sysfs_ops = &blk_mq_sysfs_ops, | |
340 | .default_attrs = default_ctx_attrs, | |
76d697d1 | 341 | .release = blk_mq_ctx_release, |
320ae51f JA |
342 | }; |
343 | ||
344 | static struct kobj_type blk_mq_hw_ktype = { | |
345 | .sysfs_ops = &blk_mq_hw_sysfs_ops, | |
346 | .default_attrs = default_hw_ctx_attrs, | |
76d697d1 | 347 | .release = blk_mq_hctx_release, |
320ae51f JA |
348 | }; |
349 | ||
ee3c5db0 | 350 | static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
351 | { |
352 | struct blk_mq_ctx *ctx; | |
353 | int i; | |
354 | ||
355 | if (!hctx->nr_ctx || !(hctx->flags & BLK_MQ_F_SYSFS_UP)) | |
356 | return; | |
357 | ||
358 | hctx_for_each_ctx(hctx, ctx, i) | |
359 | kobject_del(&ctx->kobj); | |
360 | ||
361 | kobject_del(&hctx->kobj); | |
362 | } | |
363 | ||
ee3c5db0 | 364 | static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
365 | { |
366 | struct request_queue *q = hctx->queue; | |
367 | struct blk_mq_ctx *ctx; | |
368 | int i, ret; | |
369 | ||
370 | if (!hctx->nr_ctx || !(hctx->flags & BLK_MQ_F_SYSFS_UP)) | |
371 | return 0; | |
372 | ||
373 | ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num); | |
374 | if (ret) | |
375 | return ret; | |
376 | ||
377 | hctx_for_each_ctx(hctx, ctx, i) { | |
76d697d1 | 378 | kobject_get(&q->mq_kobj); |
67aec14c JA |
379 | ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); |
380 | if (ret) | |
381 | break; | |
382 | } | |
383 | ||
384 | return ret; | |
385 | } | |
386 | ||
320ae51f JA |
387 | void blk_mq_unregister_disk(struct gendisk *disk) |
388 | { | |
389 | struct request_queue *q = disk->queue; | |
85157366 AV |
390 | struct blk_mq_hw_ctx *hctx; |
391 | struct blk_mq_ctx *ctx; | |
392 | int i, j; | |
393 | ||
394 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c JA |
395 | blk_mq_unregister_hctx(hctx); |
396 | ||
397 | hctx_for_each_ctx(hctx, ctx, j) | |
85157366 | 398 | kobject_put(&ctx->kobj); |
67aec14c | 399 | |
85157366 AV |
400 | kobject_put(&hctx->kobj); |
401 | } | |
320ae51f JA |
402 | |
403 | kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); | |
404 | kobject_del(&q->mq_kobj); | |
85157366 | 405 | kobject_put(&q->mq_kobj); |
320ae51f JA |
406 | |
407 | kobject_put(&disk_to_dev(disk)->kobj); | |
408 | } | |
409 | ||
67aec14c JA |
410 | static void blk_mq_sysfs_init(struct request_queue *q) |
411 | { | |
412 | struct blk_mq_hw_ctx *hctx; | |
413 | struct blk_mq_ctx *ctx; | |
06a41a99 | 414 | int i; |
67aec14c JA |
415 | |
416 | kobject_init(&q->mq_kobj, &blk_mq_ktype); | |
417 | ||
06a41a99 | 418 | queue_for_each_hw_ctx(q, hctx, i) |
67aec14c JA |
419 | kobject_init(&hctx->kobj, &blk_mq_hw_ktype); |
420 | ||
06a41a99 TI |
421 | queue_for_each_ctx(q, ctx, i) |
422 | kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); | |
67aec14c JA |
423 | } |
424 | ||
17497acb TH |
425 | /* see blk_register_queue() */ |
426 | void blk_mq_finish_init(struct request_queue *q) | |
427 | { | |
428 | percpu_ref_switch_to_percpu(&q->mq_usage_counter); | |
429 | } | |
430 | ||
320ae51f JA |
431 | int blk_mq_register_disk(struct gendisk *disk) |
432 | { | |
433 | struct device *dev = disk_to_dev(disk); | |
434 | struct request_queue *q = disk->queue; | |
435 | struct blk_mq_hw_ctx *hctx; | |
67aec14c | 436 | int ret, i; |
320ae51f | 437 | |
67aec14c | 438 | blk_mq_sysfs_init(q); |
320ae51f JA |
439 | |
440 | ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); | |
441 | if (ret < 0) | |
442 | return ret; | |
443 | ||
444 | kobject_uevent(&q->mq_kobj, KOBJ_ADD); | |
445 | ||
446 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c JA |
447 | hctx->flags |= BLK_MQ_F_SYSFS_UP; |
448 | ret = blk_mq_register_hctx(hctx); | |
320ae51f JA |
449 | if (ret) |
450 | break; | |
320ae51f JA |
451 | } |
452 | ||
453 | if (ret) { | |
454 | blk_mq_unregister_disk(disk); | |
455 | return ret; | |
456 | } | |
457 | ||
458 | return 0; | |
459 | } | |
67aec14c JA |
460 | |
461 | void blk_mq_sysfs_unregister(struct request_queue *q) | |
462 | { | |
463 | struct blk_mq_hw_ctx *hctx; | |
464 | int i; | |
465 | ||
466 | queue_for_each_hw_ctx(q, hctx, i) | |
467 | blk_mq_unregister_hctx(hctx); | |
468 | } | |
469 | ||
470 | int blk_mq_sysfs_register(struct request_queue *q) | |
471 | { | |
472 | struct blk_mq_hw_ctx *hctx; | |
473 | int i, ret = 0; | |
474 | ||
475 | queue_for_each_hw_ctx(q, hctx, i) { | |
476 | ret = blk_mq_register_hctx(hctx); | |
477 | if (ret) | |
478 | break; | |
479 | } | |
480 | ||
481 | return ret; | |
482 | } |