blob: 189f5ae6522af50093d3e4225bd05df31b7edc87 [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{
Jens Axboe320ae512013-10-24 09:20:05 +0100144 struct request *rq;
Ming Lei596f5aa2015-08-09 03:41:50 -0400145 int len = snprintf(page, PAGE_SIZE - 1, "%s:\n", msg);
Jens Axboe320ae512013-10-24 09:20:05 +0100146
Ming Lei596f5aa2015-08-09 03:41:50 -0400147 list_for_each_entry(rq, list, queuelist) {
148 const int rq_len = 2 * sizeof(rq) + 2;
Jens Axboe320ae512013-10-24 09:20:05 +0100149
Ming Lei596f5aa2015-08-09 03:41:50 -0400150 /* if the output will be truncated */
151 if (PAGE_SIZE - 1 < len + rq_len) {
152 /* backspacing if it can't hold '\t...\n' */
153 if (PAGE_SIZE - 1 < len + 5)
154 len -= rq_len;
155 len += snprintf(page + len, PAGE_SIZE - 1 - len,
156 "\t...\n");
157 break;
158 }
159 len += snprintf(page + len, PAGE_SIZE - 1 - len,
160 "\t%p\n", rq);
161 }
Jens Axboe320ae512013-10-24 09:20:05 +0100162
Ming Lei596f5aa2015-08-09 03:41:50 -0400163 return len;
Jens Axboe320ae512013-10-24 09:20:05 +0100164}
165
166static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page)
167{
168 ssize_t ret;
169
170 spin_lock(&ctx->lock);
171 ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending");
172 spin_unlock(&ctx->lock);
173
174 return ret;
175}
176
177static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
178 char *page)
179{
180 return sprintf(page, "%lu\n", hctx->queued);
181}
182
183static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page)
184{
185 return sprintf(page, "%lu\n", hctx->run);
186}
187
188static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
189 char *page)
190{
191 char *start_page = page;
192 int i;
193
194 page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
195
196 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
197 unsigned long d = 1U << (i - 1);
198
199 page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
200 }
201
202 return page - start_page;
203}
204
205static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
206 char *page)
207{
208 ssize_t ret;
209
210 spin_lock(&hctx->lock);
211 ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
212 spin_unlock(&hctx->lock);
213
214 return ret;
215}
216
Jens Axboe320ae512013-10-24 09:20:05 +0100217static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
218{
219 return blk_mq_tag_sysfs_show(hctx->tags, page);
220}
221
Jens Axboe0d2602c2014-05-13 15:10:52 -0600222static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page)
223{
224 return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
225}
226
Jens Axboe676141e2014-03-20 13:29:18 -0600227static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
228{
Jens Axboecb2da432014-04-09 10:53:21 -0600229 unsigned int i, first = 1;
Jens Axboe676141e2014-03-20 13:29:18 -0600230 ssize_t ret = 0;
231
232 blk_mq_disable_hotplug();
233
Jens Axboecb2da432014-04-09 10:53:21 -0600234 for_each_cpu(i, hctx->cpumask) {
Jens Axboe676141e2014-03-20 13:29:18 -0600235 if (first)
236 ret += sprintf(ret + page, "%u", i);
237 else
238 ret += sprintf(ret + page, ", %u", i);
239
240 first = 0;
241 }
242
243 blk_mq_enable_hotplug();
244
245 ret += sprintf(ret + page, "\n");
246 return ret;
247}
248
Jens Axboe320ae512013-10-24 09:20:05 +0100249static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
250 .attr = {.name = "dispatched", .mode = S_IRUGO },
251 .show = blk_mq_sysfs_dispatched_show,
252};
253static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
254 .attr = {.name = "merged", .mode = S_IRUGO },
255 .show = blk_mq_sysfs_merged_show,
256};
257static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
258 .attr = {.name = "completed", .mode = S_IRUGO },
259 .show = blk_mq_sysfs_completed_show,
260};
261static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
262 .attr = {.name = "rq_list", .mode = S_IRUGO },
263 .show = blk_mq_sysfs_rq_list_show,
264};
265
266static struct attribute *default_ctx_attrs[] = {
267 &blk_mq_sysfs_dispatched.attr,
268 &blk_mq_sysfs_merged.attr,
269 &blk_mq_sysfs_completed.attr,
270 &blk_mq_sysfs_rq_list.attr,
271 NULL,
272};
273
274static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
275 .attr = {.name = "queued", .mode = S_IRUGO },
276 .show = blk_mq_hw_sysfs_queued_show,
277};
278static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
279 .attr = {.name = "run", .mode = S_IRUGO },
280 .show = blk_mq_hw_sysfs_run_show,
281};
282static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
283 .attr = {.name = "dispatched", .mode = S_IRUGO },
284 .show = blk_mq_hw_sysfs_dispatched_show,
285};
Jens Axboe0d2602c2014-05-13 15:10:52 -0600286static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
287 .attr = {.name = "active", .mode = S_IRUGO },
288 .show = blk_mq_hw_sysfs_active_show,
289};
Jens Axboe320ae512013-10-24 09:20:05 +0100290static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
291 .attr = {.name = "pending", .mode = S_IRUGO },
292 .show = blk_mq_hw_sysfs_rq_list_show,
293};
Jens Axboe320ae512013-10-24 09:20:05 +0100294static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
295 .attr = {.name = "tags", .mode = S_IRUGO },
296 .show = blk_mq_hw_sysfs_tags_show,
297};
Jens Axboe676141e2014-03-20 13:29:18 -0600298static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
299 .attr = {.name = "cpu_list", .mode = S_IRUGO },
300 .show = blk_mq_hw_sysfs_cpus_show,
301};
Jens Axboe320ae512013-10-24 09:20:05 +0100302
303static struct attribute *default_hw_ctx_attrs[] = {
304 &blk_mq_hw_sysfs_queued.attr,
305 &blk_mq_hw_sysfs_run.attr,
306 &blk_mq_hw_sysfs_dispatched.attr,
307 &blk_mq_hw_sysfs_pending.attr,
Jens Axboe320ae512013-10-24 09:20:05 +0100308 &blk_mq_hw_sysfs_tags.attr,
Jens Axboe676141e2014-03-20 13:29:18 -0600309 &blk_mq_hw_sysfs_cpus.attr,
Jens Axboe0d2602c2014-05-13 15:10:52 -0600310 &blk_mq_hw_sysfs_active.attr,
Jens Axboe320ae512013-10-24 09:20:05 +0100311 NULL,
312};
313
314static const struct sysfs_ops blk_mq_sysfs_ops = {
315 .show = blk_mq_sysfs_show,
316 .store = blk_mq_sysfs_store,
317};
318
319static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
320 .show = blk_mq_hw_sysfs_show,
321 .store = blk_mq_hw_sysfs_store,
322};
323
324static struct kobj_type blk_mq_ktype = {
325 .sysfs_ops = &blk_mq_sysfs_ops,
326 .release = blk_mq_sysfs_release,
327};
328
329static struct kobj_type blk_mq_ctx_ktype = {
330 .sysfs_ops = &blk_mq_sysfs_ops,
331 .default_attrs = default_ctx_attrs,
Ming Lei74170112015-01-29 20:17:26 +0800332 .release = blk_mq_sysfs_release,
Jens Axboe320ae512013-10-24 09:20:05 +0100333};
334
335static struct kobj_type blk_mq_hw_ktype = {
336 .sysfs_ops = &blk_mq_hw_sysfs_ops,
337 .default_attrs = default_hw_ctx_attrs,
Ming Lei74170112015-01-29 20:17:26 +0800338 .release = blk_mq_sysfs_release,
Jens Axboe320ae512013-10-24 09:20:05 +0100339};
340
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600341static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600342{
343 struct blk_mq_ctx *ctx;
344 int i;
345
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900346 if (!hctx->nr_ctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600347 return;
348
349 hctx_for_each_ctx(hctx, ctx, i)
350 kobject_del(&ctx->kobj);
351
352 kobject_del(&hctx->kobj);
353}
354
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600355static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600356{
357 struct request_queue *q = hctx->queue;
358 struct blk_mq_ctx *ctx;
359 int i, ret;
360
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900361 if (!hctx->nr_ctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600362 return 0;
363
364 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
365 if (ret)
366 return ret;
367
368 hctx_for_each_ctx(hctx, ctx, i) {
369 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
370 if (ret)
371 break;
372 }
373
374 return ret;
375}
376
Jens Axboe320ae512013-10-24 09:20:05 +0100377void blk_mq_unregister_disk(struct gendisk *disk)
378{
379 struct request_queue *q = disk->queue;
Andrey Vagin85157362013-12-06 09:06:41 +0400380 struct blk_mq_hw_ctx *hctx;
381 struct blk_mq_ctx *ctx;
382 int i, j;
383
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900384 blk_mq_disable_hotplug();
385
Andrey Vagin85157362013-12-06 09:06:41 +0400386 queue_for_each_hw_ctx(q, hctx, i) {
Jens Axboe67aec142014-05-30 08:25:36 -0600387 blk_mq_unregister_hctx(hctx);
388
389 hctx_for_each_ctx(hctx, ctx, j)
Andrey Vagin85157362013-12-06 09:06:41 +0400390 kobject_put(&ctx->kobj);
Jens Axboe67aec142014-05-30 08:25:36 -0600391
Andrey Vagin85157362013-12-06 09:06:41 +0400392 kobject_put(&hctx->kobj);
393 }
Jens Axboe320ae512013-10-24 09:20:05 +0100394
395 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
396 kobject_del(&q->mq_kobj);
Andrey Vagin85157362013-12-06 09:06:41 +0400397 kobject_put(&q->mq_kobj);
Jens Axboe320ae512013-10-24 09:20:05 +0100398
399 kobject_put(&disk_to_dev(disk)->kobj);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900400
401 q->mq_sysfs_init_done = false;
402 blk_mq_enable_hotplug();
Jens Axboe320ae512013-10-24 09:20:05 +0100403}
404
Jens Axboe67aec142014-05-30 08:25:36 -0600405static void blk_mq_sysfs_init(struct request_queue *q)
406{
407 struct blk_mq_hw_ctx *hctx;
408 struct blk_mq_ctx *ctx;
Takashi Iwai06a41a92014-12-10 16:38:30 +0100409 int i;
Jens Axboe67aec142014-05-30 08:25:36 -0600410
411 kobject_init(&q->mq_kobj, &blk_mq_ktype);
412
Takashi Iwai06a41a92014-12-10 16:38:30 +0100413 queue_for_each_hw_ctx(q, hctx, i)
Jens Axboe67aec142014-05-30 08:25:36 -0600414 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
415
Takashi Iwai06a41a92014-12-10 16:38:30 +0100416 queue_for_each_ctx(q, ctx, i)
417 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
Jens Axboe67aec142014-05-30 08:25:36 -0600418}
419
Tejun Heo17497ac2014-09-24 13:31:50 -0400420/* see blk_register_queue() */
421void blk_mq_finish_init(struct request_queue *q)
422{
423 percpu_ref_switch_to_percpu(&q->mq_usage_counter);
424}
425
Jens Axboe320ae512013-10-24 09:20:05 +0100426int blk_mq_register_disk(struct gendisk *disk)
427{
428 struct device *dev = disk_to_dev(disk);
429 struct request_queue *q = disk->queue;
430 struct blk_mq_hw_ctx *hctx;
Jens Axboe67aec142014-05-30 08:25:36 -0600431 int ret, i;
Jens Axboe320ae512013-10-24 09:20:05 +0100432
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900433 blk_mq_disable_hotplug();
434
Jens Axboe67aec142014-05-30 08:25:36 -0600435 blk_mq_sysfs_init(q);
Jens Axboe320ae512013-10-24 09:20:05 +0100436
437 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
438 if (ret < 0)
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900439 goto out;
Jens Axboe320ae512013-10-24 09:20:05 +0100440
441 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
442
443 queue_for_each_hw_ctx(q, hctx, i) {
Jens Axboe67aec142014-05-30 08:25:36 -0600444 ret = blk_mq_register_hctx(hctx);
Jens Axboe320ae512013-10-24 09:20:05 +0100445 if (ret)
446 break;
Jens Axboe320ae512013-10-24 09:20:05 +0100447 }
448
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900449 if (ret)
Jens Axboe320ae512013-10-24 09:20:05 +0100450 blk_mq_unregister_disk(disk);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900451 else
452 q->mq_sysfs_init_done = true;
453out:
454 blk_mq_enable_hotplug();
Jens Axboe320ae512013-10-24 09:20:05 +0100455
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900456 return ret;
Jens Axboe320ae512013-10-24 09:20:05 +0100457}
Mike Snitzerb62c21b2015-03-12 23:56:02 -0400458EXPORT_SYMBOL_GPL(blk_mq_register_disk);
Jens Axboe67aec142014-05-30 08:25:36 -0600459
460void blk_mq_sysfs_unregister(struct request_queue *q)
461{
462 struct blk_mq_hw_ctx *hctx;
463 int i;
464
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900465 if (!q->mq_sysfs_init_done)
466 return;
467
Jens Axboe67aec142014-05-30 08:25:36 -0600468 queue_for_each_hw_ctx(q, hctx, i)
469 blk_mq_unregister_hctx(hctx);
470}
471
472int blk_mq_sysfs_register(struct request_queue *q)
473{
474 struct blk_mq_hw_ctx *hctx;
475 int i, ret = 0;
476
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900477 if (!q->mq_sysfs_init_done)
478 return ret;
479
Jens Axboe67aec142014-05-30 08:25:36 -0600480 queue_for_each_hw_ctx(q, hctx, i) {
481 ret = blk_mq_register_hctx(hctx);
482 if (ret)
483 break;
484 }
485
486 return ret;
487}