blob: fe822aa5b8e4a16fdb074d351959961d94de48e5 [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
Jens Axboe05229be2015-11-05 10:44:55 -0700177static ssize_t blk_mq_hw_sysfs_poll_show(struct blk_mq_hw_ctx *hctx, char *page)
178{
179 return sprintf(page, "invoked=%lu, success=%lu\n", hctx->poll_invoked, hctx->poll_success);
180}
181
Jens Axboe320ae512013-10-24 09:20:05 +0100182static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
183 char *page)
184{
185 return sprintf(page, "%lu\n", hctx->queued);
186}
187
188static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page)
189{
190 return sprintf(page, "%lu\n", hctx->run);
191}
192
193static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
194 char *page)
195{
196 char *start_page = page;
197 int i;
198
199 page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
200
201 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
202 unsigned long d = 1U << (i - 1);
203
204 page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
205 }
206
207 return page - start_page;
208}
209
210static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
211 char *page)
212{
213 ssize_t ret;
214
215 spin_lock(&hctx->lock);
216 ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
217 spin_unlock(&hctx->lock);
218
219 return ret;
220}
221
Jens Axboe320ae512013-10-24 09:20:05 +0100222static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
223{
224 return blk_mq_tag_sysfs_show(hctx->tags, page);
225}
226
Jens Axboe0d2602c2014-05-13 15:10:52 -0600227static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page)
228{
229 return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
230}
231
Jens Axboe676141e2014-03-20 13:29:18 -0600232static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
233{
Jens Axboecb2da432014-04-09 10:53:21 -0600234 unsigned int i, first = 1;
Jens Axboe676141e2014-03-20 13:29:18 -0600235 ssize_t ret = 0;
236
Jens Axboecb2da432014-04-09 10:53:21 -0600237 for_each_cpu(i, hctx->cpumask) {
Jens Axboe676141e2014-03-20 13:29:18 -0600238 if (first)
239 ret += sprintf(ret + page, "%u", i);
240 else
241 ret += sprintf(ret + page, ", %u", i);
242
243 first = 0;
244 }
245
Jens Axboe676141e2014-03-20 13:29:18 -0600246 ret += sprintf(ret + page, "\n");
247 return ret;
248}
249
Jens Axboe320ae512013-10-24 09:20:05 +0100250static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
251 .attr = {.name = "dispatched", .mode = S_IRUGO },
252 .show = blk_mq_sysfs_dispatched_show,
253};
254static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
255 .attr = {.name = "merged", .mode = S_IRUGO },
256 .show = blk_mq_sysfs_merged_show,
257};
258static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
259 .attr = {.name = "completed", .mode = S_IRUGO },
260 .show = blk_mq_sysfs_completed_show,
261};
262static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
263 .attr = {.name = "rq_list", .mode = S_IRUGO },
264 .show = blk_mq_sysfs_rq_list_show,
265};
266
267static struct attribute *default_ctx_attrs[] = {
268 &blk_mq_sysfs_dispatched.attr,
269 &blk_mq_sysfs_merged.attr,
270 &blk_mq_sysfs_completed.attr,
271 &blk_mq_sysfs_rq_list.attr,
272 NULL,
273};
274
275static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
276 .attr = {.name = "queued", .mode = S_IRUGO },
277 .show = blk_mq_hw_sysfs_queued_show,
278};
279static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
280 .attr = {.name = "run", .mode = S_IRUGO },
281 .show = blk_mq_hw_sysfs_run_show,
282};
283static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
284 .attr = {.name = "dispatched", .mode = S_IRUGO },
285 .show = blk_mq_hw_sysfs_dispatched_show,
286};
Jens Axboe0d2602c2014-05-13 15:10:52 -0600287static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
288 .attr = {.name = "active", .mode = S_IRUGO },
289 .show = blk_mq_hw_sysfs_active_show,
290};
Jens Axboe320ae512013-10-24 09:20:05 +0100291static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
292 .attr = {.name = "pending", .mode = S_IRUGO },
293 .show = blk_mq_hw_sysfs_rq_list_show,
294};
Jens Axboe320ae512013-10-24 09:20:05 +0100295static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
296 .attr = {.name = "tags", .mode = S_IRUGO },
297 .show = blk_mq_hw_sysfs_tags_show,
298};
Jens Axboe676141e2014-03-20 13:29:18 -0600299static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
300 .attr = {.name = "cpu_list", .mode = S_IRUGO },
301 .show = blk_mq_hw_sysfs_cpus_show,
302};
Jens Axboe05229be2015-11-05 10:44:55 -0700303static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_poll = {
304 .attr = {.name = "io_poll", .mode = S_IRUGO },
305 .show = blk_mq_hw_sysfs_poll_show,
306};
Jens Axboe320ae512013-10-24 09:20:05 +0100307
308static struct attribute *default_hw_ctx_attrs[] = {
309 &blk_mq_hw_sysfs_queued.attr,
310 &blk_mq_hw_sysfs_run.attr,
311 &blk_mq_hw_sysfs_dispatched.attr,
312 &blk_mq_hw_sysfs_pending.attr,
Jens Axboe320ae512013-10-24 09:20:05 +0100313 &blk_mq_hw_sysfs_tags.attr,
Jens Axboe676141e2014-03-20 13:29:18 -0600314 &blk_mq_hw_sysfs_cpus.attr,
Jens Axboe0d2602c2014-05-13 15:10:52 -0600315 &blk_mq_hw_sysfs_active.attr,
Jens Axboe05229be2015-11-05 10:44:55 -0700316 &blk_mq_hw_sysfs_poll.attr,
Jens Axboe320ae512013-10-24 09:20:05 +0100317 NULL,
318};
319
320static const struct sysfs_ops blk_mq_sysfs_ops = {
321 .show = blk_mq_sysfs_show,
322 .store = blk_mq_sysfs_store,
323};
324
325static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
326 .show = blk_mq_hw_sysfs_show,
327 .store = blk_mq_hw_sysfs_store,
328};
329
330static struct kobj_type blk_mq_ktype = {
331 .sysfs_ops = &blk_mq_sysfs_ops,
332 .release = blk_mq_sysfs_release,
333};
334
335static struct kobj_type blk_mq_ctx_ktype = {
336 .sysfs_ops = &blk_mq_sysfs_ops,
337 .default_attrs = default_ctx_attrs,
Ming Lei74170112015-01-29 20:17:26 +0800338 .release = blk_mq_sysfs_release,
Jens Axboe320ae512013-10-24 09:20:05 +0100339};
340
341static struct kobj_type blk_mq_hw_ktype = {
342 .sysfs_ops = &blk_mq_hw_sysfs_ops,
343 .default_attrs = default_hw_ctx_attrs,
Ming Lei74170112015-01-29 20:17:26 +0800344 .release = blk_mq_sysfs_release,
Jens Axboe320ae512013-10-24 09:20:05 +0100345};
346
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600347static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600348{
349 struct blk_mq_ctx *ctx;
350 int i;
351
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900352 if (!hctx->nr_ctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600353 return;
354
355 hctx_for_each_ctx(hctx, ctx, i)
356 kobject_del(&ctx->kobj);
357
358 kobject_del(&hctx->kobj);
359}
360
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600361static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600362{
363 struct request_queue *q = hctx->queue;
364 struct blk_mq_ctx *ctx;
365 int i, ret;
366
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900367 if (!hctx->nr_ctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600368 return 0;
369
370 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
371 if (ret)
372 return ret;
373
374 hctx_for_each_ctx(hctx, ctx, i) {
375 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
376 if (ret)
377 break;
378 }
379
380 return ret;
381}
382
Jens Axboec0f3fd22016-08-02 08:45:44 -0600383static void __blk_mq_unregister_disk(struct gendisk *disk)
Jens Axboe320ae512013-10-24 09:20:05 +0100384{
385 struct request_queue *q = disk->queue;
Andrey Vagin85157362013-12-06 09:06:41 +0400386 struct blk_mq_hw_ctx *hctx;
387 struct blk_mq_ctx *ctx;
388 int i, j;
389
390 queue_for_each_hw_ctx(q, hctx, i) {
Jens Axboe67aec142014-05-30 08:25:36 -0600391 blk_mq_unregister_hctx(hctx);
392
393 hctx_for_each_ctx(hctx, ctx, j)
Andrey Vagin85157362013-12-06 09:06:41 +0400394 kobject_put(&ctx->kobj);
Jens Axboe67aec142014-05-30 08:25:36 -0600395
Andrey Vagin85157362013-12-06 09:06:41 +0400396 kobject_put(&hctx->kobj);
397 }
Jens Axboe320ae512013-10-24 09:20:05 +0100398
399 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
400 kobject_del(&q->mq_kobj);
Andrey Vagin85157362013-12-06 09:06:41 +0400401 kobject_put(&q->mq_kobj);
Jens Axboe320ae512013-10-24 09:20:05 +0100402
403 kobject_put(&disk_to_dev(disk)->kobj);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900404
405 q->mq_sysfs_init_done = false;
Jens Axboec0f3fd22016-08-02 08:45:44 -0600406}
407
408void blk_mq_unregister_disk(struct gendisk *disk)
409{
410 blk_mq_disable_hotplug();
411 __blk_mq_unregister_disk(disk);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900412 blk_mq_enable_hotplug();
Jens Axboe320ae512013-10-24 09:20:05 +0100413}
414
Keith Busch868f2f02015-12-17 17:08:14 -0700415void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
416{
417 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
418}
419
Jens Axboe67aec142014-05-30 08:25:36 -0600420static void blk_mq_sysfs_init(struct request_queue *q)
421{
Jens Axboe67aec142014-05-30 08:25:36 -0600422 struct blk_mq_ctx *ctx;
Thomas Gleixner897bb0c2016-03-19 11:30:33 +0100423 int cpu;
Jens Axboe67aec142014-05-30 08:25:36 -0600424
425 kobject_init(&q->mq_kobj, &blk_mq_ktype);
426
Thomas Gleixner897bb0c2016-03-19 11:30:33 +0100427 for_each_possible_cpu(cpu) {
428 ctx = per_cpu_ptr(q->queue_ctx, cpu);
Takashi Iwai06a41a92014-12-10 16:38:30 +0100429 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
Thomas Gleixner897bb0c2016-03-19 11:30:33 +0100430 }
Jens Axboe67aec142014-05-30 08:25:36 -0600431}
432
Jens Axboe320ae512013-10-24 09:20:05 +0100433int blk_mq_register_disk(struct gendisk *disk)
434{
435 struct device *dev = disk_to_dev(disk);
436 struct request_queue *q = disk->queue;
437 struct blk_mq_hw_ctx *hctx;
Jens Axboe67aec142014-05-30 08:25:36 -0600438 int ret, i;
Jens Axboe320ae512013-10-24 09:20:05 +0100439
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900440 blk_mq_disable_hotplug();
441
Jens Axboe67aec142014-05-30 08:25:36 -0600442 blk_mq_sysfs_init(q);
Jens Axboe320ae512013-10-24 09:20:05 +0100443
444 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
445 if (ret < 0)
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900446 goto out;
Jens Axboe320ae512013-10-24 09:20:05 +0100447
448 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
449
450 queue_for_each_hw_ctx(q, hctx, i) {
Jens Axboe67aec142014-05-30 08:25:36 -0600451 ret = blk_mq_register_hctx(hctx);
Jens Axboe320ae512013-10-24 09:20:05 +0100452 if (ret)
453 break;
Jens Axboe320ae512013-10-24 09:20:05 +0100454 }
455
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900456 if (ret)
Jens Axboec0f3fd22016-08-02 08:45:44 -0600457 __blk_mq_unregister_disk(disk);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900458 else
459 q->mq_sysfs_init_done = true;
460out:
461 blk_mq_enable_hotplug();
Jens Axboe320ae512013-10-24 09:20:05 +0100462
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900463 return ret;
Jens Axboe320ae512013-10-24 09:20:05 +0100464}
Mike Snitzerb62c21b2015-03-12 23:56:02 -0400465EXPORT_SYMBOL_GPL(blk_mq_register_disk);
Jens Axboe67aec142014-05-30 08:25:36 -0600466
467void blk_mq_sysfs_unregister(struct request_queue *q)
468{
469 struct blk_mq_hw_ctx *hctx;
470 int i;
471
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900472 if (!q->mq_sysfs_init_done)
473 return;
474
Jens Axboe67aec142014-05-30 08:25:36 -0600475 queue_for_each_hw_ctx(q, hctx, i)
476 blk_mq_unregister_hctx(hctx);
477}
478
479int blk_mq_sysfs_register(struct request_queue *q)
480{
481 struct blk_mq_hw_ctx *hctx;
482 int i, ret = 0;
483
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900484 if (!q->mq_sysfs_init_done)
485 return ret;
486
Jens Axboe67aec142014-05-30 08:25:36 -0600487 queue_for_each_hw_ctx(q, hctx, i) {
488 ret = blk_mq_register_hctx(hctx);
489 if (ret)
490 break;
491 }
492
493 return ret;
494}