blob: 1630a20d5dcfa550ebe9c8815927d51b70bd9d56 [file] [log] [blame]
Jens Axboe320ae512013-10-24 09:20:05 +01001#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
16static void blk_mq_sysfs_release(struct kobject *kobj)
17{
18}
19
20struct 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
26struct 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
32static 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
55static 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
78static 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
101static 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
125static 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
131static 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
136static 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
142static 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
155static 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
166static 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
172static 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
177static 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
194static 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
Jens Axboe320ae512013-10-24 09:20:05 +0100206static 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
Jens Axboe0d2602c2014-05-13 15:10:52 -0600211static 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
Jens Axboe676141e2014-03-20 13:29:18 -0600216static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
217{
Jens Axboecb2da432014-04-09 10:53:21 -0600218 unsigned int i, first = 1;
Jens Axboe676141e2014-03-20 13:29:18 -0600219 ssize_t ret = 0;
220
221 blk_mq_disable_hotplug();
222
Jens Axboecb2da432014-04-09 10:53:21 -0600223 for_each_cpu(i, hctx->cpumask) {
Jens Axboe676141e2014-03-20 13:29:18 -0600224 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
Jens Axboe320ae512013-10-24 09:20:05 +0100238static 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};
242static 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};
246static 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};
250static 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
255static 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
263static 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};
267static 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};
271static 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};
Jens Axboe0d2602c2014-05-13 15:10:52 -0600275static 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};
Jens Axboe320ae512013-10-24 09:20:05 +0100279static 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};
Jens Axboe320ae512013-10-24 09:20:05 +0100283static 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};
Jens Axboe676141e2014-03-20 13:29:18 -0600287static 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};
Jens Axboe320ae512013-10-24 09:20:05 +0100291
292static 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,
Jens Axboe320ae512013-10-24 09:20:05 +0100297 &blk_mq_hw_sysfs_tags.attr,
Jens Axboe676141e2014-03-20 13:29:18 -0600298 &blk_mq_hw_sysfs_cpus.attr,
Jens Axboe0d2602c2014-05-13 15:10:52 -0600299 &blk_mq_hw_sysfs_active.attr,
Jens Axboe320ae512013-10-24 09:20:05 +0100300 NULL,
301};
302
303static const struct sysfs_ops blk_mq_sysfs_ops = {
304 .show = blk_mq_sysfs_show,
305 .store = blk_mq_sysfs_store,
306};
307
308static 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
313static struct kobj_type blk_mq_ktype = {
314 .sysfs_ops = &blk_mq_sysfs_ops,
315 .release = blk_mq_sysfs_release,
316};
317
318static 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
324static 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
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600330static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600331{
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
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600344static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600345{
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
Jens Axboe320ae512013-10-24 09:20:05 +0100366void blk_mq_unregister_disk(struct gendisk *disk)
367{
368 struct request_queue *q = disk->queue;
Andrey Vagin85157362013-12-06 09:06:41 +0400369 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) {
Jens Axboe67aec142014-05-30 08:25:36 -0600374 blk_mq_unregister_hctx(hctx);
375
376 hctx_for_each_ctx(hctx, ctx, j)
Andrey Vagin85157362013-12-06 09:06:41 +0400377 kobject_put(&ctx->kobj);
Jens Axboe67aec142014-05-30 08:25:36 -0600378
Andrey Vagin85157362013-12-06 09:06:41 +0400379 kobject_put(&hctx->kobj);
380 }
Jens Axboe320ae512013-10-24 09:20:05 +0100381
382 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
383 kobject_del(&q->mq_kobj);
Andrey Vagin85157362013-12-06 09:06:41 +0400384 kobject_put(&q->mq_kobj);
Jens Axboe320ae512013-10-24 09:20:05 +0100385
386 kobject_put(&disk_to_dev(disk)->kobj);
387}
388
Jens Axboe67aec142014-05-30 08:25:36 -0600389static void blk_mq_sysfs_init(struct request_queue *q)
390{
391 struct blk_mq_hw_ctx *hctx;
392 struct blk_mq_ctx *ctx;
Takashi Iwai06a41a92014-12-10 16:38:30 +0100393 int i;
Jens Axboe67aec142014-05-30 08:25:36 -0600394
395 kobject_init(&q->mq_kobj, &blk_mq_ktype);
396
Takashi Iwai06a41a92014-12-10 16:38:30 +0100397 queue_for_each_hw_ctx(q, hctx, i)
Jens Axboe67aec142014-05-30 08:25:36 -0600398 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
399
Takashi Iwai06a41a92014-12-10 16:38:30 +0100400 queue_for_each_ctx(q, ctx, i)
401 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
Jens Axboe67aec142014-05-30 08:25:36 -0600402}
403
Tejun Heo17497ac2014-09-24 13:31:50 -0400404/* see blk_register_queue() */
405void blk_mq_finish_init(struct request_queue *q)
406{
407 percpu_ref_switch_to_percpu(&q->mq_usage_counter);
408}
409
Jens Axboe320ae512013-10-24 09:20:05 +0100410int 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;
Jens Axboe67aec142014-05-30 08:25:36 -0600415 int ret, i;
Jens Axboe320ae512013-10-24 09:20:05 +0100416
Jens Axboe67aec142014-05-30 08:25:36 -0600417 blk_mq_sysfs_init(q);
Jens Axboe320ae512013-10-24 09:20:05 +0100418
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) {
Jens Axboe67aec142014-05-30 08:25:36 -0600426 hctx->flags |= BLK_MQ_F_SYSFS_UP;
427 ret = blk_mq_register_hctx(hctx);
Jens Axboe320ae512013-10-24 09:20:05 +0100428 if (ret)
429 break;
Jens Axboe320ae512013-10-24 09:20:05 +0100430 }
431
432 if (ret) {
433 blk_mq_unregister_disk(disk);
434 return ret;
435 }
436
437 return 0;
438}
Jens Axboe67aec142014-05-30 08:25:36 -0600439
440void 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
449int 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}