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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
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
206static ssize_t blk_mq_hw_sysfs_ipi_show(struct blk_mq_hw_ctx *hctx, char *page)
207{
208 ssize_t ret;
209
210 spin_lock(&hctx->lock);
211 ret = sprintf(page, "%u\n", !!(hctx->flags & BLK_MQ_F_SHOULD_IPI));
212 spin_unlock(&hctx->lock);
213
214 return ret;
215}
216
217static ssize_t blk_mq_hw_sysfs_ipi_store(struct blk_mq_hw_ctx *hctx,
218 const char *page, size_t len)
219{
220 struct blk_mq_ctx *ctx;
221 unsigned long ret;
222 unsigned int i;
223
224 if (kstrtoul(page, 10, &ret)) {
225 pr_err("blk-mq-sysfs: invalid input '%s'\n", page);
226 return -EINVAL;
227 }
228
229 spin_lock(&hctx->lock);
230 if (ret)
231 hctx->flags |= BLK_MQ_F_SHOULD_IPI;
232 else
233 hctx->flags &= ~BLK_MQ_F_SHOULD_IPI;
234 spin_unlock(&hctx->lock);
235
236 hctx_for_each_ctx(hctx, ctx, i)
237 ctx->ipi_redirect = !!ret;
238
239 return len;
240}
241
242static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
243{
244 return blk_mq_tag_sysfs_show(hctx->tags, page);
245}
246
247static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
248{
249 unsigned int i, queue_num, first = 1;
250 ssize_t ret = 0;
251
252 blk_mq_disable_hotplug();
253
254 for_each_online_cpu(i) {
255 queue_num = hctx->queue->mq_map[i];
256 if (queue_num != hctx->queue_num)
257 continue;
258
259 if (first)
260 ret += sprintf(ret + page, "%u", i);
261 else
262 ret += sprintf(ret + page, ", %u", i);
263
264 first = 0;
265 }
266
267 blk_mq_enable_hotplug();
268
269 ret += sprintf(ret + page, "\n");
270 return ret;
271}
272
273static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
274 .attr = {.name = "dispatched", .mode = S_IRUGO },
275 .show = blk_mq_sysfs_dispatched_show,
276};
277static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
278 .attr = {.name = "merged", .mode = S_IRUGO },
279 .show = blk_mq_sysfs_merged_show,
280};
281static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
282 .attr = {.name = "completed", .mode = S_IRUGO },
283 .show = blk_mq_sysfs_completed_show,
284};
285static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
286 .attr = {.name = "rq_list", .mode = S_IRUGO },
287 .show = blk_mq_sysfs_rq_list_show,
288};
289
290static struct attribute *default_ctx_attrs[] = {
291 &blk_mq_sysfs_dispatched.attr,
292 &blk_mq_sysfs_merged.attr,
293 &blk_mq_sysfs_completed.attr,
294 &blk_mq_sysfs_rq_list.attr,
295 NULL,
296};
297
298static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
299 .attr = {.name = "queued", .mode = S_IRUGO },
300 .show = blk_mq_hw_sysfs_queued_show,
301};
302static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
303 .attr = {.name = "run", .mode = S_IRUGO },
304 .show = blk_mq_hw_sysfs_run_show,
305};
306static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
307 .attr = {.name = "dispatched", .mode = S_IRUGO },
308 .show = blk_mq_hw_sysfs_dispatched_show,
309};
310static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
311 .attr = {.name = "pending", .mode = S_IRUGO },
312 .show = blk_mq_hw_sysfs_rq_list_show,
313};
314static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_ipi = {
315 .attr = {.name = "ipi_redirect", .mode = S_IRUGO | S_IWUSR},
316 .show = blk_mq_hw_sysfs_ipi_show,
317 .store = blk_mq_hw_sysfs_ipi_store,
318};
319static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
320 .attr = {.name = "tags", .mode = S_IRUGO },
321 .show = blk_mq_hw_sysfs_tags_show,
322};
323static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
324 .attr = {.name = "cpu_list", .mode = S_IRUGO },
325 .show = blk_mq_hw_sysfs_cpus_show,
326};
327
328static struct attribute *default_hw_ctx_attrs[] = {
329 &blk_mq_hw_sysfs_queued.attr,
330 &blk_mq_hw_sysfs_run.attr,
331 &blk_mq_hw_sysfs_dispatched.attr,
332 &blk_mq_hw_sysfs_pending.attr,
333 &blk_mq_hw_sysfs_ipi.attr,
334 &blk_mq_hw_sysfs_tags.attr,
335 &blk_mq_hw_sysfs_cpus.attr,
336 NULL,
337};
338
339static const struct sysfs_ops blk_mq_sysfs_ops = {
340 .show = blk_mq_sysfs_show,
341 .store = blk_mq_sysfs_store,
342};
343
344static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
345 .show = blk_mq_hw_sysfs_show,
346 .store = blk_mq_hw_sysfs_store,
347};
348
349static struct kobj_type blk_mq_ktype = {
350 .sysfs_ops = &blk_mq_sysfs_ops,
351 .release = blk_mq_sysfs_release,
352};
353
354static struct kobj_type blk_mq_ctx_ktype = {
355 .sysfs_ops = &blk_mq_sysfs_ops,
356 .default_attrs = default_ctx_attrs,
357 .release = blk_mq_sysfs_release,
358};
359
360static struct kobj_type blk_mq_hw_ktype = {
361 .sysfs_ops = &blk_mq_hw_sysfs_ops,
362 .default_attrs = default_hw_ctx_attrs,
363 .release = blk_mq_sysfs_release,
364};
365
366void blk_mq_unregister_disk(struct gendisk *disk)
367{
368 struct request_queue *q = disk->queue;
369 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) {
374 hctx_for_each_ctx(hctx, ctx, j) {
375 kobject_del(&ctx->kobj);
376 kobject_put(&ctx->kobj);
377 }
378 kobject_del(&hctx->kobj);
379 kobject_put(&hctx->kobj);
380 }
381
382 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
383 kobject_del(&q->mq_kobj);
384 kobject_put(&q->mq_kobj);
385
386 kobject_put(&disk_to_dev(disk)->kobj);
387}
388
389int blk_mq_register_disk(struct gendisk *disk)
390{
391 struct device *dev = disk_to_dev(disk);
392 struct request_queue *q = disk->queue;
393 struct blk_mq_hw_ctx *hctx;
394 struct blk_mq_ctx *ctx;
395 int ret, i, j;
396
397 kobject_init(&q->mq_kobj, &blk_mq_ktype);
398
399 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
400 if (ret < 0)
401 return ret;
402
403 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
404
405 queue_for_each_hw_ctx(q, hctx, i) {
406 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
407 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", i);
408 if (ret)
409 break;
410
411 if (!hctx->nr_ctx)
412 continue;
413
414 hctx_for_each_ctx(hctx, ctx, j) {
415 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
416 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
417 if (ret)
418 break;
419 }
420 }
421
422 if (ret) {
423 blk_mq_unregister_disk(disk);
424 return ret;
425 }
426
427 return 0;
428}
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}