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