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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
16static void blk_mq_sysfs_release(struct kobject *kobj)
17{
18}
19
20static 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);
24 free_cpumask_var(hctx->cpumask);
25 kfree(hctx->ctxs);
26 kfree(hctx);
27}
28
29struct 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
134static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
135 char *page)
136{
137 return sprintf(page, "%u\n", hctx->tags->nr_tags);
138}
139
140static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
141 char *page)
142{
143 return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
144}
145
146static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
147{
148 unsigned int i, first = 1;
149 ssize_t ret = 0;
150
151 for_each_cpu(i, hctx->cpumask) {
152 if (first)
153 ret += sprintf(ret + page, "%u", i);
154 else
155 ret += sprintf(ret + page, ", %u", i);
156
157 first = 0;
158 }
159
160 ret += sprintf(ret + page, "\n");
161 return ret;
162}
163
164static struct attribute *default_ctx_attrs[] = {
165 NULL,
166};
167
168static 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};
176static 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};
180
181static struct attribute *default_hw_ctx_attrs[] = {
182 &blk_mq_hw_sysfs_nr_tags.attr,
183 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
184 &blk_mq_hw_sysfs_cpus.attr,
185 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,
206 .release = blk_mq_sysfs_release,
207};
208
209static struct kobj_type blk_mq_hw_ktype = {
210 .sysfs_ops = &blk_mq_hw_sysfs_ops,
211 .default_attrs = default_hw_ctx_attrs,
212 .release = blk_mq_hw_sysfs_release,
213};
214
215static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
216{
217 struct blk_mq_ctx *ctx;
218 int i;
219
220 if (!hctx->nr_ctx)
221 return;
222
223 hctx_for_each_ctx(hctx, ctx, i)
224 kobject_del(&ctx->kobj);
225
226 kobject_del(&hctx->kobj);
227}
228
229static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
230{
231 struct request_queue *q = hctx->queue;
232 struct blk_mq_ctx *ctx;
233 int i, ret;
234
235 if (!hctx->nr_ctx)
236 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
251void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
252{
253 struct blk_mq_hw_ctx *hctx;
254 int i;
255
256 lockdep_assert_held(&q->sysfs_lock);
257
258 queue_for_each_hw_ctx(q, hctx, i)
259 blk_mq_unregister_hctx(hctx);
260
261 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
262 kobject_del(&q->mq_kobj);
263 kobject_put(&dev->kobj);
264
265 q->mq_sysfs_init_done = false;
266}
267
268void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
269{
270 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
271}
272
273void blk_mq_sysfs_deinit(struct request_queue *q)
274{
275 struct blk_mq_ctx *ctx;
276 int cpu;
277
278 for_each_possible_cpu(cpu) {
279 ctx = per_cpu_ptr(q->queue_ctx, cpu);
280 kobject_put(&ctx->kobj);
281 }
282 kobject_put(&q->mq_kobj);
283}
284
285void blk_mq_sysfs_init(struct request_queue *q)
286{
287 struct blk_mq_ctx *ctx;
288 int cpu;
289
290 kobject_init(&q->mq_kobj, &blk_mq_ktype);
291
292 for_each_possible_cpu(cpu) {
293 ctx = per_cpu_ptr(q->queue_ctx, cpu);
294 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
295 }
296}
297
298int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
299{
300 struct blk_mq_hw_ctx *hctx;
301 int ret, i;
302
303 WARN_ON_ONCE(!q->kobj.parent);
304 lockdep_assert_held(&q->sysfs_lock);
305
306 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
307 if (ret < 0)
308 goto out;
309
310 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
311
312 queue_for_each_hw_ctx(q, hctx, i) {
313 ret = blk_mq_register_hctx(hctx);
314 if (ret)
315 goto unreg;
316 }
317
318 q->mq_sysfs_init_done = true;
319
320out:
321 return ret;
322
323unreg:
324 while (--i >= 0)
325 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
326
327 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
328 kobject_del(&q->mq_kobj);
329 kobject_put(&dev->kobj);
330 return ret;
331}
332
333int blk_mq_register_dev(struct device *dev, struct request_queue *q)
334{
335 int ret;
336
337 mutex_lock(&q->sysfs_lock);
338 ret = __blk_mq_register_dev(dev, q);
339 mutex_unlock(&q->sysfs_lock);
340
341 return ret;
342}
343EXPORT_SYMBOL_GPL(blk_mq_register_dev);
344
345void blk_mq_sysfs_unregister(struct request_queue *q)
346{
347 struct blk_mq_hw_ctx *hctx;
348 int i;
349
350 mutex_lock(&q->sysfs_lock);
351 if (!q->mq_sysfs_init_done)
352 goto unlock;
353
354 queue_for_each_hw_ctx(q, hctx, i)
355 blk_mq_unregister_hctx(hctx);
356
357unlock:
358 mutex_unlock(&q->sysfs_lock);
359}
360
361int blk_mq_sysfs_register(struct request_queue *q)
362{
363 struct blk_mq_hw_ctx *hctx;
364 int i, ret = 0;
365
366 mutex_lock(&q->sysfs_lock);
367 if (!q->mq_sysfs_init_done)
368 goto unlock;
369
370 queue_for_each_hw_ctx(q, hctx, i) {
371 ret = blk_mq_register_hctx(hctx);
372 if (ret)
373 break;
374 }
375
376unlock:
377 mutex_unlock(&q->sysfs_lock);
378
379 return ret;
380}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/module.h>
4#include <linux/backing-dev.h>
5#include <linux/bio.h>
6#include <linux/blkdev.h>
7#include <linux/mm.h>
8#include <linux/init.h>
9#include <linux/slab.h>
10#include <linux/workqueue.h>
11#include <linux/smp.h>
12
13#include <linux/blk-mq.h>
14#include "blk.h"
15#include "blk-mq.h"
16#include "blk-mq-tag.h"
17
18static void blk_mq_sysfs_release(struct kobject *kobj)
19{
20 struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);
21
22 free_percpu(ctxs->queue_ctx);
23 kfree(ctxs);
24}
25
26static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
27{
28 struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);
29
30 /* ctx->ctxs won't be released until all ctx are freed */
31 kobject_put(&ctx->ctxs->kobj);
32}
33
34static void blk_mq_hw_sysfs_release(struct kobject *kobj)
35{
36 struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
37 kobj);
38
39 cancel_delayed_work_sync(&hctx->run_work);
40
41 if (hctx->flags & BLK_MQ_F_BLOCKING)
42 cleanup_srcu_struct(hctx->srcu);
43 blk_free_flush_queue(hctx->fq);
44 sbitmap_free(&hctx->ctx_map);
45 free_cpumask_var(hctx->cpumask);
46 kfree(hctx->ctxs);
47 kfree(hctx);
48}
49
50struct blk_mq_ctx_sysfs_entry {
51 struct attribute attr;
52 ssize_t (*show)(struct blk_mq_ctx *, char *);
53 ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
54};
55
56struct blk_mq_hw_ctx_sysfs_entry {
57 struct attribute attr;
58 ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
59 ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
60};
61
62static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
63 char *page)
64{
65 struct blk_mq_ctx_sysfs_entry *entry;
66 struct blk_mq_ctx *ctx;
67 struct request_queue *q;
68 ssize_t res;
69
70 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
71 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
72 q = ctx->queue;
73
74 if (!entry->show)
75 return -EIO;
76
77 res = -ENOENT;
78 mutex_lock(&q->sysfs_lock);
79 if (!blk_queue_dying(q))
80 res = entry->show(ctx, page);
81 mutex_unlock(&q->sysfs_lock);
82 return res;
83}
84
85static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
86 const char *page, size_t length)
87{
88 struct blk_mq_ctx_sysfs_entry *entry;
89 struct blk_mq_ctx *ctx;
90 struct request_queue *q;
91 ssize_t res;
92
93 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
94 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
95 q = ctx->queue;
96
97 if (!entry->store)
98 return -EIO;
99
100 res = -ENOENT;
101 mutex_lock(&q->sysfs_lock);
102 if (!blk_queue_dying(q))
103 res = entry->store(ctx, page, length);
104 mutex_unlock(&q->sysfs_lock);
105 return res;
106}
107
108static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
109 struct attribute *attr, char *page)
110{
111 struct blk_mq_hw_ctx_sysfs_entry *entry;
112 struct blk_mq_hw_ctx *hctx;
113 struct request_queue *q;
114 ssize_t res;
115
116 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
117 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
118 q = hctx->queue;
119
120 if (!entry->show)
121 return -EIO;
122
123 res = -ENOENT;
124 mutex_lock(&q->sysfs_lock);
125 if (!blk_queue_dying(q))
126 res = entry->show(hctx, page);
127 mutex_unlock(&q->sysfs_lock);
128 return res;
129}
130
131static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
132 struct attribute *attr, const char *page,
133 size_t length)
134{
135 struct blk_mq_hw_ctx_sysfs_entry *entry;
136 struct blk_mq_hw_ctx *hctx;
137 struct request_queue *q;
138 ssize_t res;
139
140 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
141 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
142 q = hctx->queue;
143
144 if (!entry->store)
145 return -EIO;
146
147 res = -ENOENT;
148 mutex_lock(&q->sysfs_lock);
149 if (!blk_queue_dying(q))
150 res = entry->store(hctx, page, length);
151 mutex_unlock(&q->sysfs_lock);
152 return res;
153}
154
155static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
156 char *page)
157{
158 return sprintf(page, "%u\n", hctx->tags->nr_tags);
159}
160
161static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
162 char *page)
163{
164 return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
165}
166
167static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
168{
169 unsigned int i, first = 1;
170 ssize_t ret = 0;
171
172 for_each_cpu(i, hctx->cpumask) {
173 if (first)
174 ret += sprintf(ret + page, "%u", i);
175 else
176 ret += sprintf(ret + page, ", %u", i);
177
178 first = 0;
179 }
180
181 ret += sprintf(ret + page, "\n");
182 return ret;
183}
184
185static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
186 .attr = {.name = "nr_tags", .mode = 0444 },
187 .show = blk_mq_hw_sysfs_nr_tags_show,
188};
189static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
190 .attr = {.name = "nr_reserved_tags", .mode = 0444 },
191 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
192};
193static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
194 .attr = {.name = "cpu_list", .mode = 0444 },
195 .show = blk_mq_hw_sysfs_cpus_show,
196};
197
198static struct attribute *default_hw_ctx_attrs[] = {
199 &blk_mq_hw_sysfs_nr_tags.attr,
200 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
201 &blk_mq_hw_sysfs_cpus.attr,
202 NULL,
203};
204ATTRIBUTE_GROUPS(default_hw_ctx);
205
206static const struct sysfs_ops blk_mq_sysfs_ops = {
207 .show = blk_mq_sysfs_show,
208 .store = blk_mq_sysfs_store,
209};
210
211static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
212 .show = blk_mq_hw_sysfs_show,
213 .store = blk_mq_hw_sysfs_store,
214};
215
216static struct kobj_type blk_mq_ktype = {
217 .sysfs_ops = &blk_mq_sysfs_ops,
218 .release = blk_mq_sysfs_release,
219};
220
221static struct kobj_type blk_mq_ctx_ktype = {
222 .sysfs_ops = &blk_mq_sysfs_ops,
223 .release = blk_mq_ctx_sysfs_release,
224};
225
226static struct kobj_type blk_mq_hw_ktype = {
227 .sysfs_ops = &blk_mq_hw_sysfs_ops,
228 .default_groups = default_hw_ctx_groups,
229 .release = blk_mq_hw_sysfs_release,
230};
231
232static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
233{
234 struct blk_mq_ctx *ctx;
235 int i;
236
237 if (!hctx->nr_ctx)
238 return;
239
240 hctx_for_each_ctx(hctx, ctx, i)
241 kobject_del(&ctx->kobj);
242
243 kobject_del(&hctx->kobj);
244}
245
246static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
247{
248 struct request_queue *q = hctx->queue;
249 struct blk_mq_ctx *ctx;
250 int i, ret;
251
252 if (!hctx->nr_ctx)
253 return 0;
254
255 ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
256 if (ret)
257 return ret;
258
259 hctx_for_each_ctx(hctx, ctx, i) {
260 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
261 if (ret)
262 break;
263 }
264
265 return ret;
266}
267
268void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
269{
270 struct blk_mq_hw_ctx *hctx;
271 int i;
272
273 lockdep_assert_held(&q->sysfs_dir_lock);
274
275 queue_for_each_hw_ctx(q, hctx, i)
276 blk_mq_unregister_hctx(hctx);
277
278 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
279 kobject_del(q->mq_kobj);
280 kobject_put(&dev->kobj);
281
282 q->mq_sysfs_init_done = false;
283}
284
285void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
286{
287 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
288}
289
290void blk_mq_sysfs_deinit(struct request_queue *q)
291{
292 struct blk_mq_ctx *ctx;
293 int cpu;
294
295 for_each_possible_cpu(cpu) {
296 ctx = per_cpu_ptr(q->queue_ctx, cpu);
297 kobject_put(&ctx->kobj);
298 }
299 kobject_put(q->mq_kobj);
300}
301
302void blk_mq_sysfs_init(struct request_queue *q)
303{
304 struct blk_mq_ctx *ctx;
305 int cpu;
306
307 kobject_init(q->mq_kobj, &blk_mq_ktype);
308
309 for_each_possible_cpu(cpu) {
310 ctx = per_cpu_ptr(q->queue_ctx, cpu);
311
312 kobject_get(q->mq_kobj);
313 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
314 }
315}
316
317int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
318{
319 struct blk_mq_hw_ctx *hctx;
320 int ret, i;
321
322 WARN_ON_ONCE(!q->kobj.parent);
323 lockdep_assert_held(&q->sysfs_dir_lock);
324
325 ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
326 if (ret < 0)
327 goto out;
328
329 kobject_uevent(q->mq_kobj, KOBJ_ADD);
330
331 queue_for_each_hw_ctx(q, hctx, i) {
332 ret = blk_mq_register_hctx(hctx);
333 if (ret)
334 goto unreg;
335 }
336
337 q->mq_sysfs_init_done = true;
338
339out:
340 return ret;
341
342unreg:
343 while (--i >= 0)
344 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
345
346 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
347 kobject_del(q->mq_kobj);
348 kobject_put(&dev->kobj);
349 return ret;
350}
351
352void blk_mq_sysfs_unregister(struct request_queue *q)
353{
354 struct blk_mq_hw_ctx *hctx;
355 int i;
356
357 mutex_lock(&q->sysfs_dir_lock);
358 if (!q->mq_sysfs_init_done)
359 goto unlock;
360
361 queue_for_each_hw_ctx(q, hctx, i)
362 blk_mq_unregister_hctx(hctx);
363
364unlock:
365 mutex_unlock(&q->sysfs_dir_lock);
366}
367
368int blk_mq_sysfs_register(struct request_queue *q)
369{
370 struct blk_mq_hw_ctx *hctx;
371 int i, ret = 0;
372
373 mutex_lock(&q->sysfs_dir_lock);
374 if (!q->mq_sysfs_init_done)
375 goto unlock;
376
377 queue_for_each_hw_ctx(q, hctx, i) {
378 ret = blk_mq_register_hctx(hctx);
379 if (ret)
380 break;
381 }
382
383unlock:
384 mutex_unlock(&q->sysfs_dir_lock);
385
386 return ret;
387}