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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 "blk.h"
14#include "blk-mq.h"
15
16static void blk_mq_sysfs_release(struct kobject *kobj)
17{
18 struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);
19
20 free_percpu(ctxs->queue_ctx);
21 kfree(ctxs);
22}
23
24static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
25{
26 struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);
27
28 /* ctx->ctxs won't be released until all ctx are freed */
29 kobject_put(&ctx->ctxs->kobj);
30}
31
32static void blk_mq_hw_sysfs_release(struct kobject *kobj)
33{
34 struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
35 kobj);
36
37 blk_free_flush_queue(hctx->fq);
38 sbitmap_free(&hctx->ctx_map);
39 free_cpumask_var(hctx->cpumask);
40 kfree(hctx->ctxs);
41 kfree(hctx);
42}
43
44struct blk_mq_hw_ctx_sysfs_entry {
45 struct attribute attr;
46 ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
47};
48
49static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
50 struct attribute *attr, char *page)
51{
52 struct blk_mq_hw_ctx_sysfs_entry *entry;
53 struct blk_mq_hw_ctx *hctx;
54 struct request_queue *q;
55 ssize_t res;
56
57 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
58 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
59 q = hctx->queue;
60
61 if (!entry->show)
62 return -EIO;
63
64 mutex_lock(&q->sysfs_lock);
65 res = entry->show(hctx, page);
66 mutex_unlock(&q->sysfs_lock);
67 return res;
68}
69
70static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
71 char *page)
72{
73 return sprintf(page, "%u\n", hctx->tags->nr_tags);
74}
75
76static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
77 char *page)
78{
79 return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
80}
81
82static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
83{
84 const size_t size = PAGE_SIZE - 1;
85 unsigned int i, first = 1;
86 int ret = 0, pos = 0;
87
88 for_each_cpu(i, hctx->cpumask) {
89 if (first)
90 ret = snprintf(pos + page, size - pos, "%u", i);
91 else
92 ret = snprintf(pos + page, size - pos, ", %u", i);
93
94 if (ret >= size - pos)
95 break;
96
97 first = 0;
98 pos += ret;
99 }
100
101 ret = snprintf(pos + page, size + 1 - pos, "\n");
102 return pos + ret;
103}
104
105static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
106 .attr = {.name = "nr_tags", .mode = 0444 },
107 .show = blk_mq_hw_sysfs_nr_tags_show,
108};
109static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
110 .attr = {.name = "nr_reserved_tags", .mode = 0444 },
111 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
112};
113static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
114 .attr = {.name = "cpu_list", .mode = 0444 },
115 .show = blk_mq_hw_sysfs_cpus_show,
116};
117
118static struct attribute *default_hw_ctx_attrs[] = {
119 &blk_mq_hw_sysfs_nr_tags.attr,
120 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
121 &blk_mq_hw_sysfs_cpus.attr,
122 NULL,
123};
124ATTRIBUTE_GROUPS(default_hw_ctx);
125
126static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
127 .show = blk_mq_hw_sysfs_show,
128};
129
130static const struct kobj_type blk_mq_ktype = {
131 .release = blk_mq_sysfs_release,
132};
133
134static const struct kobj_type blk_mq_ctx_ktype = {
135 .release = blk_mq_ctx_sysfs_release,
136};
137
138static const struct kobj_type blk_mq_hw_ktype = {
139 .sysfs_ops = &blk_mq_hw_sysfs_ops,
140 .default_groups = default_hw_ctx_groups,
141 .release = blk_mq_hw_sysfs_release,
142};
143
144static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
145{
146 struct blk_mq_ctx *ctx;
147 int i;
148
149 if (!hctx->nr_ctx)
150 return;
151
152 hctx_for_each_ctx(hctx, ctx, i)
153 kobject_del(&ctx->kobj);
154
155 kobject_del(&hctx->kobj);
156}
157
158static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
159{
160 struct request_queue *q = hctx->queue;
161 struct blk_mq_ctx *ctx;
162 int i, j, ret;
163
164 if (!hctx->nr_ctx)
165 return 0;
166
167 ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
168 if (ret)
169 return ret;
170
171 hctx_for_each_ctx(hctx, ctx, i) {
172 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
173 if (ret)
174 goto out;
175 }
176
177 return 0;
178out:
179 hctx_for_each_ctx(hctx, ctx, j) {
180 if (j < i)
181 kobject_del(&ctx->kobj);
182 }
183 kobject_del(&hctx->kobj);
184 return ret;
185}
186
187void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
188{
189 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
190}
191
192void blk_mq_sysfs_deinit(struct request_queue *q)
193{
194 struct blk_mq_ctx *ctx;
195 int cpu;
196
197 for_each_possible_cpu(cpu) {
198 ctx = per_cpu_ptr(q->queue_ctx, cpu);
199 kobject_put(&ctx->kobj);
200 }
201 kobject_put(q->mq_kobj);
202}
203
204void blk_mq_sysfs_init(struct request_queue *q)
205{
206 struct blk_mq_ctx *ctx;
207 int cpu;
208
209 kobject_init(q->mq_kobj, &blk_mq_ktype);
210
211 for_each_possible_cpu(cpu) {
212 ctx = per_cpu_ptr(q->queue_ctx, cpu);
213
214 kobject_get(q->mq_kobj);
215 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
216 }
217}
218
219int blk_mq_sysfs_register(struct gendisk *disk)
220{
221 struct request_queue *q = disk->queue;
222 struct blk_mq_hw_ctx *hctx;
223 unsigned long i, j;
224 int ret;
225
226 lockdep_assert_held(&q->sysfs_dir_lock);
227
228 ret = kobject_add(q->mq_kobj, &disk_to_dev(disk)->kobj, "mq");
229 if (ret < 0)
230 goto out;
231
232 kobject_uevent(q->mq_kobj, KOBJ_ADD);
233
234 queue_for_each_hw_ctx(q, hctx, i) {
235 ret = blk_mq_register_hctx(hctx);
236 if (ret)
237 goto unreg;
238 }
239
240 q->mq_sysfs_init_done = true;
241
242out:
243 return ret;
244
245unreg:
246 queue_for_each_hw_ctx(q, hctx, j) {
247 if (j < i)
248 blk_mq_unregister_hctx(hctx);
249 }
250
251 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
252 kobject_del(q->mq_kobj);
253 return ret;
254}
255
256void blk_mq_sysfs_unregister(struct gendisk *disk)
257{
258 struct request_queue *q = disk->queue;
259 struct blk_mq_hw_ctx *hctx;
260 unsigned long i;
261
262 lockdep_assert_held(&q->sysfs_dir_lock);
263
264 queue_for_each_hw_ctx(q, hctx, i)
265 blk_mq_unregister_hctx(hctx);
266
267 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
268 kobject_del(q->mq_kobj);
269
270 q->mq_sysfs_init_done = false;
271}
272
273void blk_mq_sysfs_unregister_hctxs(struct request_queue *q)
274{
275 struct blk_mq_hw_ctx *hctx;
276 unsigned long i;
277
278 mutex_lock(&q->sysfs_dir_lock);
279 if (!q->mq_sysfs_init_done)
280 goto unlock;
281
282 queue_for_each_hw_ctx(q, hctx, i)
283 blk_mq_unregister_hctx(hctx);
284
285unlock:
286 mutex_unlock(&q->sysfs_dir_lock);
287}
288
289int blk_mq_sysfs_register_hctxs(struct request_queue *q)
290{
291 struct blk_mq_hw_ctx *hctx;
292 unsigned long i;
293 int ret = 0;
294
295 mutex_lock(&q->sysfs_dir_lock);
296 if (!q->mq_sysfs_init_done)
297 goto unlock;
298
299 queue_for_each_hw_ctx(q, hctx, i) {
300 ret = blk_mq_register_hctx(hctx);
301 if (ret)
302 break;
303 }
304
305unlock:
306 mutex_unlock(&q->sysfs_dir_lock);
307
308 return ret;
309}