blob: 79969c3c234fd9db3f76f2186d3f7080e9f1e321 [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
Ming Lei6c8b2322017-02-22 18:14:01 +080020static void blk_mq_hw_sysfs_release(struct kobject *kobj)
21{
22 struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
23 kobj);
Ming Lei01388df2017-02-22 18:14:02 +080024 free_cpumask_var(hctx->cpumask);
Ming Lei6c8b2322017-02-22 18:14:01 +080025 kfree(hctx->ctxs);
26 kfree(hctx);
27}
28
Jens Axboe320ae512013-10-24 09:20:05 +010029struct blk_mq_ctx_sysfs_entry {
30 struct attribute attr;
31 ssize_t (*show)(struct blk_mq_ctx *, char *);
32 ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
33};
34
35struct blk_mq_hw_ctx_sysfs_entry {
36 struct attribute attr;
37 ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
38 ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
39};
40
41static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
42 char *page)
43{
44 struct blk_mq_ctx_sysfs_entry *entry;
45 struct blk_mq_ctx *ctx;
46 struct request_queue *q;
47 ssize_t res;
48
49 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
50 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
51 q = ctx->queue;
52
53 if (!entry->show)
54 return -EIO;
55
56 res = -ENOENT;
57 mutex_lock(&q->sysfs_lock);
58 if (!blk_queue_dying(q))
59 res = entry->show(ctx, page);
60 mutex_unlock(&q->sysfs_lock);
61 return res;
62}
63
64static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
65 const char *page, size_t length)
66{
67 struct blk_mq_ctx_sysfs_entry *entry;
68 struct blk_mq_ctx *ctx;
69 struct request_queue *q;
70 ssize_t res;
71
72 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
73 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
74 q = ctx->queue;
75
76 if (!entry->store)
77 return -EIO;
78
79 res = -ENOENT;
80 mutex_lock(&q->sysfs_lock);
81 if (!blk_queue_dying(q))
82 res = entry->store(ctx, page, length);
83 mutex_unlock(&q->sysfs_lock);
84 return res;
85}
86
87static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
88 struct attribute *attr, char *page)
89{
90 struct blk_mq_hw_ctx_sysfs_entry *entry;
91 struct blk_mq_hw_ctx *hctx;
92 struct request_queue *q;
93 ssize_t res;
94
95 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
96 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
97 q = hctx->queue;
98
99 if (!entry->show)
100 return -EIO;
101
102 res = -ENOENT;
103 mutex_lock(&q->sysfs_lock);
104 if (!blk_queue_dying(q))
105 res = entry->show(hctx, page);
106 mutex_unlock(&q->sysfs_lock);
107 return res;
108}
109
110static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
111 struct attribute *attr, const char *page,
112 size_t length)
113{
114 struct blk_mq_hw_ctx_sysfs_entry *entry;
115 struct blk_mq_hw_ctx *hctx;
116 struct request_queue *q;
117 ssize_t res;
118
119 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
120 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
121 q = hctx->queue;
122
123 if (!entry->store)
124 return -EIO;
125
126 res = -ENOENT;
127 mutex_lock(&q->sysfs_lock);
128 if (!blk_queue_dying(q))
129 res = entry->store(hctx, page, length);
130 mutex_unlock(&q->sysfs_lock);
131 return res;
132}
133
Omar Sandovald96b37c2017-01-25 08:06:46 -0800134static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
135 char *page)
Jens Axboebd166ef2017-01-17 06:03:22 -0700136{
Omar Sandovald96b37c2017-01-25 08:06:46 -0800137 return sprintf(page, "%u\n", hctx->tags->nr_tags);
Jens Axboebd166ef2017-01-17 06:03:22 -0700138}
139
Omar Sandovald96b37c2017-01-25 08:06:46 -0800140static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
141 char *page)
Jens Axboe320ae512013-10-24 09:20:05 +0100142{
Omar Sandovald96b37c2017-01-25 08:06:46 -0800143 return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
Jens Axboe320ae512013-10-24 09:20:05 +0100144}
145
Jens Axboe676141e2014-03-20 13:29:18 -0600146static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
147{
Jens Axboecb2da432014-04-09 10:53:21 -0600148 unsigned int i, first = 1;
Jens Axboe676141e2014-03-20 13:29:18 -0600149 ssize_t ret = 0;
150
Jens Axboecb2da432014-04-09 10:53:21 -0600151 for_each_cpu(i, hctx->cpumask) {
Jens Axboe676141e2014-03-20 13:29:18 -0600152 if (first)
153 ret += sprintf(ret + page, "%u", i);
154 else
155 ret += sprintf(ret + page, ", %u", i);
156
157 first = 0;
158 }
159
Jens Axboe676141e2014-03-20 13:29:18 -0600160 ret += sprintf(ret + page, "\n");
161 return ret;
162}
163
Jens Axboe320ae512013-10-24 09:20:05 +0100164static struct attribute *default_ctx_attrs[] = {
Jens Axboe320ae512013-10-24 09:20:05 +0100165 NULL,
166};
167
Omar Sandovald96b37c2017-01-25 08:06:46 -0800168static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
169 .attr = {.name = "nr_tags", .mode = S_IRUGO },
170 .show = blk_mq_hw_sysfs_nr_tags_show,
171};
172static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
173 .attr = {.name = "nr_reserved_tags", .mode = S_IRUGO },
174 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
175};
Jens Axboe676141e2014-03-20 13:29:18 -0600176static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
177 .attr = {.name = "cpu_list", .mode = S_IRUGO },
178 .show = blk_mq_hw_sysfs_cpus_show,
179};
Jens Axboe320ae512013-10-24 09:20:05 +0100180
181static struct attribute *default_hw_ctx_attrs[] = {
Omar Sandovald96b37c2017-01-25 08:06:46 -0800182 &blk_mq_hw_sysfs_nr_tags.attr,
183 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
Jens Axboe676141e2014-03-20 13:29:18 -0600184 &blk_mq_hw_sysfs_cpus.attr,
Jens Axboe320ae512013-10-24 09:20:05 +0100185 NULL,
186};
187
188static const struct sysfs_ops blk_mq_sysfs_ops = {
189 .show = blk_mq_sysfs_show,
190 .store = blk_mq_sysfs_store,
191};
192
193static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
194 .show = blk_mq_hw_sysfs_show,
195 .store = blk_mq_hw_sysfs_store,
196};
197
198static struct kobj_type blk_mq_ktype = {
199 .sysfs_ops = &blk_mq_sysfs_ops,
200 .release = blk_mq_sysfs_release,
201};
202
203static struct kobj_type blk_mq_ctx_ktype = {
204 .sysfs_ops = &blk_mq_sysfs_ops,
205 .default_attrs = default_ctx_attrs,
Ming Lei74170112015-01-29 20:17:26 +0800206 .release = blk_mq_sysfs_release,
Jens Axboe320ae512013-10-24 09:20:05 +0100207};
208
209static struct kobj_type blk_mq_hw_ktype = {
210 .sysfs_ops = &blk_mq_hw_sysfs_ops,
211 .default_attrs = default_hw_ctx_attrs,
Ming Lei6c8b2322017-02-22 18:14:01 +0800212 .release = blk_mq_hw_sysfs_release,
Jens Axboe320ae512013-10-24 09:20:05 +0100213};
214
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600215static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600216{
217 struct blk_mq_ctx *ctx;
218 int i;
219
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900220 if (!hctx->nr_ctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600221 return;
222
223 hctx_for_each_ctx(hctx, ctx, i)
224 kobject_del(&ctx->kobj);
225
226 kobject_del(&hctx->kobj);
227}
228
Fengguang Wuee3c5db2014-05-30 10:31:13 -0600229static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600230{
231 struct request_queue *q = hctx->queue;
232 struct blk_mq_ctx *ctx;
233 int i, ret;
234
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900235 if (!hctx->nr_ctx)
Jens Axboe67aec142014-05-30 08:25:36 -0600236 return 0;
237
238 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
239 if (ret)
240 return ret;
241
242 hctx_for_each_ctx(hctx, ctx, i) {
243 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
244 if (ret)
245 break;
246 }
247
248 return ret;
249}
250
Matias Bjørlingb21d5b32016-09-16 14:25:06 +0200251static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
Jens Axboe320ae512013-10-24 09:20:05 +0100252{
Andrey Vagin85157362013-12-06 09:06:41 +0400253 struct blk_mq_hw_ctx *hctx;
Ming Lei7ea5fe32017-02-22 18:14:00 +0800254 int i;
Andrey Vagin85157362013-12-06 09:06:41 +0400255
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700256 lockdep_assert_held(&q->sysfs_lock);
257
Ming Lei6c8b2322017-02-22 18:14:01 +0800258 queue_for_each_hw_ctx(q, hctx, i)
Jens Axboe67aec142014-05-30 08:25:36 -0600259 blk_mq_unregister_hctx(hctx);
260
Jens Axboe320ae512013-10-24 09:20:05 +0100261 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
262 kobject_del(&q->mq_kobj);
Matias Bjørlingb21d5b32016-09-16 14:25:06 +0200263 kobject_put(&dev->kobj);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900264
265 q->mq_sysfs_init_done = false;
Jens Axboec0f3fd22016-08-02 08:45:44 -0600266}
267
Matias Bjørlingb21d5b32016-09-16 14:25:06 +0200268void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
Jens Axboec0f3fd22016-08-02 08:45:44 -0600269{
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700270 mutex_lock(&q->sysfs_lock);
Matias Bjørlingb21d5b32016-09-16 14:25:06 +0200271 __blk_mq_unregister_dev(dev, q);
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700272 mutex_unlock(&q->sysfs_lock);
Jens Axboe320ae512013-10-24 09:20:05 +0100273}
274
Keith Busch868f2f02015-12-17 17:08:14 -0700275void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
276{
277 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
278}
279
Ming Lei7ea5fe32017-02-22 18:14:00 +0800280void blk_mq_sysfs_deinit(struct request_queue *q)
281{
282 struct blk_mq_ctx *ctx;
283 int cpu;
284
285 for_each_possible_cpu(cpu) {
286 ctx = per_cpu_ptr(q->queue_ctx, cpu);
287 kobject_put(&ctx->kobj);
288 }
289 kobject_put(&q->mq_kobj);
290}
291
Ming Lei737f98c2017-02-22 18:13:59 +0800292void blk_mq_sysfs_init(struct request_queue *q)
Jens Axboe67aec142014-05-30 08:25:36 -0600293{
Jens Axboe67aec142014-05-30 08:25:36 -0600294 struct blk_mq_ctx *ctx;
Thomas Gleixner897bb0c2016-03-19 11:30:33 +0100295 int cpu;
Jens Axboe67aec142014-05-30 08:25:36 -0600296
297 kobject_init(&q->mq_kobj, &blk_mq_ktype);
298
Thomas Gleixner897bb0c2016-03-19 11:30:33 +0100299 for_each_possible_cpu(cpu) {
300 ctx = per_cpu_ptr(q->queue_ctx, cpu);
Takashi Iwai06a41a92014-12-10 16:38:30 +0100301 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
Thomas Gleixner897bb0c2016-03-19 11:30:33 +0100302 }
Jens Axboe67aec142014-05-30 08:25:36 -0600303}
304
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700305int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
Jens Axboe320ae512013-10-24 09:20:05 +0100306{
Jens Axboe320ae512013-10-24 09:20:05 +0100307 struct blk_mq_hw_ctx *hctx;
Jens Axboe67aec142014-05-30 08:25:36 -0600308 int ret, i;
Jens Axboe320ae512013-10-24 09:20:05 +0100309
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700310 WARN_ON_ONCE(!q->kobj.parent);
311 lockdep_assert_held(&q->sysfs_lock);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900312
Jens Axboe320ae512013-10-24 09:20:05 +0100313 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
314 if (ret < 0)
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900315 goto out;
Jens Axboe320ae512013-10-24 09:20:05 +0100316
317 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
318
319 queue_for_each_hw_ctx(q, hctx, i) {
Jens Axboe67aec142014-05-30 08:25:36 -0600320 ret = blk_mq_register_hctx(hctx);
Jens Axboe320ae512013-10-24 09:20:05 +0100321 if (ret)
Bart Van Asschef05d1ba2017-04-26 13:47:51 -0700322 goto unreg;
Jens Axboe320ae512013-10-24 09:20:05 +0100323 }
324
Bart Van Asschef05d1ba2017-04-26 13:47:51 -0700325 q->mq_sysfs_init_done = true;
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700326
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900327out:
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700328 return ret;
Bart Van Asschef05d1ba2017-04-26 13:47:51 -0700329
330unreg:
331 while (--i >= 0)
332 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
333
Bart Van Asschef05d1ba2017-04-26 13:47:51 -0700334 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
335 kobject_del(&q->mq_kobj);
336 kobject_put(&dev->kobj);
337 return ret;
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700338}
339
340int blk_mq_register_dev(struct device *dev, struct request_queue *q)
341{
342 int ret;
343
344 mutex_lock(&q->sysfs_lock);
345 ret = __blk_mq_register_dev(dev, q);
346 mutex_unlock(&q->sysfs_lock);
Jens Axboe320ae512013-10-24 09:20:05 +0100347
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900348 return ret;
Jens Axboe320ae512013-10-24 09:20:05 +0100349}
Matias Bjørlingb21d5b32016-09-16 14:25:06 +0200350EXPORT_SYMBOL_GPL(blk_mq_register_dev);
Jens Axboe67aec142014-05-30 08:25:36 -0600351
352void blk_mq_sysfs_unregister(struct request_queue *q)
353{
354 struct blk_mq_hw_ctx *hctx;
355 int i;
356
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700357 mutex_lock(&q->sysfs_lock);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900358 if (!q->mq_sysfs_init_done)
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700359 goto unlock;
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900360
Jens Axboe67aec142014-05-30 08:25:36 -0600361 queue_for_each_hw_ctx(q, hctx, i)
362 blk_mq_unregister_hctx(hctx);
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700363
364unlock:
365 mutex_unlock(&q->sysfs_lock);
Jens Axboe67aec142014-05-30 08:25:36 -0600366}
367
368int blk_mq_sysfs_register(struct request_queue *q)
369{
370 struct blk_mq_hw_ctx *hctx;
371 int i, ret = 0;
372
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700373 mutex_lock(&q->sysfs_lock);
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900374 if (!q->mq_sysfs_init_done)
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700375 goto unlock;
Akinobu Mita4593fdb2015-09-27 02:09:20 +0900376
Jens Axboe67aec142014-05-30 08:25:36 -0600377 queue_for_each_hw_ctx(q, hctx, i) {
378 ret = blk_mq_register_hctx(hctx);
379 if (ret)
380 break;
381 }
382
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700383unlock:
384 mutex_unlock(&q->sysfs_lock);
385
Jens Axboe67aec142014-05-30 08:25:36 -0600386 return ret;
387}