]>
Commit | Line | Data |
---|---|---|
3dcf60bc | 1 | // SPDX-License-Identifier: GPL-2.0 |
320ae51f JA |
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> | |
c7e2d94b | 14 | #include "blk.h" |
320ae51f JA |
15 | #include "blk-mq.h" |
16 | #include "blk-mq-tag.h" | |
17 | ||
18 | static void blk_mq_sysfs_release(struct kobject *kobj) | |
19 | { | |
1db4909e ML |
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 | ||
26 | static 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); | |
320ae51f JA |
32 | } |
33 | ||
6c8b232e ML |
34 | static 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); | |
c7e2d94b ML |
38 | |
39 | if (hctx->flags & BLK_MQ_F_BLOCKING) | |
40 | cleanup_srcu_struct(hctx->srcu); | |
41 | blk_free_flush_queue(hctx->fq); | |
42 | sbitmap_free(&hctx->ctx_map); | |
01388df3 | 43 | free_cpumask_var(hctx->cpumask); |
6c8b232e ML |
44 | kfree(hctx->ctxs); |
45 | kfree(hctx); | |
46 | } | |
47 | ||
320ae51f JA |
48 | struct blk_mq_ctx_sysfs_entry { |
49 | struct attribute attr; | |
50 | ssize_t (*show)(struct blk_mq_ctx *, char *); | |
51 | ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); | |
52 | }; | |
53 | ||
54 | struct blk_mq_hw_ctx_sysfs_entry { | |
55 | struct attribute attr; | |
56 | ssize_t (*show)(struct blk_mq_hw_ctx *, char *); | |
57 | ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); | |
58 | }; | |
59 | ||
60 | static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, | |
61 | char *page) | |
62 | { | |
63 | struct blk_mq_ctx_sysfs_entry *entry; | |
64 | struct blk_mq_ctx *ctx; | |
65 | struct request_queue *q; | |
66 | ssize_t res; | |
67 | ||
68 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
69 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
70 | q = ctx->queue; | |
71 | ||
72 | if (!entry->show) | |
73 | return -EIO; | |
74 | ||
75 | res = -ENOENT; | |
76 | mutex_lock(&q->sysfs_lock); | |
77 | if (!blk_queue_dying(q)) | |
78 | res = entry->show(ctx, page); | |
79 | mutex_unlock(&q->sysfs_lock); | |
80 | return res; | |
81 | } | |
82 | ||
83 | static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
84 | const char *page, size_t length) | |
85 | { | |
86 | struct blk_mq_ctx_sysfs_entry *entry; | |
87 | struct blk_mq_ctx *ctx; | |
88 | struct request_queue *q; | |
89 | ssize_t res; | |
90 | ||
91 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
92 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
93 | q = ctx->queue; | |
94 | ||
95 | if (!entry->store) | |
96 | return -EIO; | |
97 | ||
98 | res = -ENOENT; | |
99 | mutex_lock(&q->sysfs_lock); | |
100 | if (!blk_queue_dying(q)) | |
101 | res = entry->store(ctx, page, length); | |
102 | mutex_unlock(&q->sysfs_lock); | |
103 | return res; | |
104 | } | |
105 | ||
106 | static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, | |
107 | struct attribute *attr, char *page) | |
108 | { | |
109 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
110 | struct blk_mq_hw_ctx *hctx; | |
111 | struct request_queue *q; | |
112 | ssize_t res; | |
113 | ||
114 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
115 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
116 | q = hctx->queue; | |
117 | ||
118 | if (!entry->show) | |
119 | return -EIO; | |
120 | ||
121 | res = -ENOENT; | |
122 | mutex_lock(&q->sysfs_lock); | |
123 | if (!blk_queue_dying(q)) | |
124 | res = entry->show(hctx, page); | |
125 | mutex_unlock(&q->sysfs_lock); | |
126 | return res; | |
127 | } | |
128 | ||
129 | static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, | |
130 | struct attribute *attr, const char *page, | |
131 | size_t length) | |
132 | { | |
133 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
134 | struct blk_mq_hw_ctx *hctx; | |
135 | struct request_queue *q; | |
136 | ssize_t res; | |
137 | ||
138 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
139 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
140 | q = hctx->queue; | |
141 | ||
142 | if (!entry->store) | |
143 | return -EIO; | |
144 | ||
145 | res = -ENOENT; | |
146 | mutex_lock(&q->sysfs_lock); | |
147 | if (!blk_queue_dying(q)) | |
148 | res = entry->store(hctx, page, length); | |
149 | mutex_unlock(&q->sysfs_lock); | |
150 | return res; | |
151 | } | |
152 | ||
d96b37c0 OS |
153 | static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, |
154 | char *page) | |
bd166ef1 | 155 | { |
d96b37c0 | 156 | return sprintf(page, "%u\n", hctx->tags->nr_tags); |
bd166ef1 JA |
157 | } |
158 | ||
d96b37c0 OS |
159 | static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, |
160 | char *page) | |
320ae51f | 161 | { |
d96b37c0 | 162 | return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); |
320ae51f JA |
163 | } |
164 | ||
676141e4 JA |
165 | static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) |
166 | { | |
4fd488c3 | 167 | const size_t size = PAGE_SIZE - 1; |
cb2da43e | 168 | unsigned int i, first = 1; |
4fd488c3 | 169 | int ret = 0, pos = 0; |
676141e4 | 170 | |
cb2da43e | 171 | for_each_cpu(i, hctx->cpumask) { |
676141e4 | 172 | if (first) |
4fd488c3 | 173 | ret = snprintf(pos + page, size - pos, "%u", i); |
676141e4 | 174 | else |
4fd488c3 ML |
175 | ret = snprintf(pos + page, size - pos, ", %u", i); |
176 | ||
177 | if (ret >= size - pos) | |
178 | break; | |
676141e4 JA |
179 | |
180 | first = 0; | |
4fd488c3 | 181 | pos += ret; |
676141e4 JA |
182 | } |
183 | ||
5dbf8b6c | 184 | ret = snprintf(pos + page, size + 1 - pos, "\n"); |
4fd488c3 | 185 | return pos + ret; |
676141e4 JA |
186 | } |
187 | ||
d96b37c0 | 188 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { |
5657a819 | 189 | .attr = {.name = "nr_tags", .mode = 0444 }, |
d96b37c0 OS |
190 | .show = blk_mq_hw_sysfs_nr_tags_show, |
191 | }; | |
192 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { | |
5657a819 | 193 | .attr = {.name = "nr_reserved_tags", .mode = 0444 }, |
d96b37c0 OS |
194 | .show = blk_mq_hw_sysfs_nr_reserved_tags_show, |
195 | }; | |
676141e4 | 196 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
5657a819 | 197 | .attr = {.name = "cpu_list", .mode = 0444 }, |
676141e4 JA |
198 | .show = blk_mq_hw_sysfs_cpus_show, |
199 | }; | |
320ae51f JA |
200 | |
201 | static struct attribute *default_hw_ctx_attrs[] = { | |
d96b37c0 OS |
202 | &blk_mq_hw_sysfs_nr_tags.attr, |
203 | &blk_mq_hw_sysfs_nr_reserved_tags.attr, | |
676141e4 | 204 | &blk_mq_hw_sysfs_cpus.attr, |
320ae51f JA |
205 | NULL, |
206 | }; | |
800f5aa1 | 207 | ATTRIBUTE_GROUPS(default_hw_ctx); |
320ae51f JA |
208 | |
209 | static const struct sysfs_ops blk_mq_sysfs_ops = { | |
210 | .show = blk_mq_sysfs_show, | |
211 | .store = blk_mq_sysfs_store, | |
212 | }; | |
213 | ||
214 | static const struct sysfs_ops blk_mq_hw_sysfs_ops = { | |
215 | .show = blk_mq_hw_sysfs_show, | |
216 | .store = blk_mq_hw_sysfs_store, | |
217 | }; | |
218 | ||
219 | static struct kobj_type blk_mq_ktype = { | |
220 | .sysfs_ops = &blk_mq_sysfs_ops, | |
221 | .release = blk_mq_sysfs_release, | |
222 | }; | |
223 | ||
224 | static struct kobj_type blk_mq_ctx_ktype = { | |
225 | .sysfs_ops = &blk_mq_sysfs_ops, | |
1db4909e | 226 | .release = blk_mq_ctx_sysfs_release, |
320ae51f JA |
227 | }; |
228 | ||
229 | static struct kobj_type blk_mq_hw_ktype = { | |
230 | .sysfs_ops = &blk_mq_hw_sysfs_ops, | |
800f5aa1 | 231 | .default_groups = default_hw_ctx_groups, |
6c8b232e | 232 | .release = blk_mq_hw_sysfs_release, |
320ae51f JA |
233 | }; |
234 | ||
ee3c5db0 | 235 | static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
236 | { |
237 | struct blk_mq_ctx *ctx; | |
238 | int i; | |
239 | ||
4593fdbe | 240 | if (!hctx->nr_ctx) |
67aec14c JA |
241 | return; |
242 | ||
243 | hctx_for_each_ctx(hctx, ctx, i) | |
244 | kobject_del(&ctx->kobj); | |
245 | ||
246 | kobject_del(&hctx->kobj); | |
247 | } | |
248 | ||
ee3c5db0 | 249 | static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
250 | { |
251 | struct request_queue *q = hctx->queue; | |
252 | struct blk_mq_ctx *ctx; | |
253 | int i, ret; | |
254 | ||
4593fdbe | 255 | if (!hctx->nr_ctx) |
67aec14c JA |
256 | return 0; |
257 | ||
1db4909e | 258 | ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num); |
67aec14c JA |
259 | if (ret) |
260 | return ret; | |
261 | ||
262 | hctx_for_each_ctx(hctx, ctx, i) { | |
263 | ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); | |
264 | if (ret) | |
265 | break; | |
266 | } | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
667257e8 | 271 | void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
320ae51f | 272 | { |
85157366 | 273 | struct blk_mq_hw_ctx *hctx; |
7ea5fe31 | 274 | int i; |
85157366 | 275 | |
cecf5d87 | 276 | lockdep_assert_held(&q->sysfs_dir_lock); |
2d0364c8 | 277 | |
6c8b232e | 278 | queue_for_each_hw_ctx(q, hctx, i) |
67aec14c JA |
279 | blk_mq_unregister_hctx(hctx); |
280 | ||
1db4909e ML |
281 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
282 | kobject_del(q->mq_kobj); | |
b21d5b30 | 283 | kobject_put(&dev->kobj); |
4593fdbe AM |
284 | |
285 | q->mq_sysfs_init_done = false; | |
c0f3fd2b JA |
286 | } |
287 | ||
868f2f0b KB |
288 | void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) |
289 | { | |
290 | kobject_init(&hctx->kobj, &blk_mq_hw_ktype); | |
291 | } | |
292 | ||
7ea5fe31 ML |
293 | void blk_mq_sysfs_deinit(struct request_queue *q) |
294 | { | |
295 | struct blk_mq_ctx *ctx; | |
296 | int cpu; | |
297 | ||
298 | for_each_possible_cpu(cpu) { | |
299 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
300 | kobject_put(&ctx->kobj); | |
301 | } | |
1db4909e | 302 | kobject_put(q->mq_kobj); |
7ea5fe31 ML |
303 | } |
304 | ||
737f98cf | 305 | void blk_mq_sysfs_init(struct request_queue *q) |
67aec14c | 306 | { |
67aec14c | 307 | struct blk_mq_ctx *ctx; |
897bb0c7 | 308 | int cpu; |
67aec14c | 309 | |
1db4909e | 310 | kobject_init(q->mq_kobj, &blk_mq_ktype); |
67aec14c | 311 | |
897bb0c7 TG |
312 | for_each_possible_cpu(cpu) { |
313 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
1db4909e ML |
314 | |
315 | kobject_get(q->mq_kobj); | |
06a41a99 | 316 | kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
897bb0c7 | 317 | } |
67aec14c JA |
318 | } |
319 | ||
2d0364c8 | 320 | int __blk_mq_register_dev(struct device *dev, struct request_queue *q) |
320ae51f | 321 | { |
320ae51f | 322 | struct blk_mq_hw_ctx *hctx; |
67aec14c | 323 | int ret, i; |
320ae51f | 324 | |
2d0364c8 | 325 | WARN_ON_ONCE(!q->kobj.parent); |
cecf5d87 | 326 | lockdep_assert_held(&q->sysfs_dir_lock); |
4593fdbe | 327 | |
1db4909e | 328 | ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); |
320ae51f | 329 | if (ret < 0) |
4593fdbe | 330 | goto out; |
320ae51f | 331 | |
1db4909e | 332 | kobject_uevent(q->mq_kobj, KOBJ_ADD); |
320ae51f JA |
333 | |
334 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c | 335 | ret = blk_mq_register_hctx(hctx); |
320ae51f | 336 | if (ret) |
f05d1ba7 | 337 | goto unreg; |
320ae51f JA |
338 | } |
339 | ||
f05d1ba7 | 340 | q->mq_sysfs_init_done = true; |
2d0364c8 | 341 | |
4593fdbe | 342 | out: |
2d0364c8 | 343 | return ret; |
f05d1ba7 BVA |
344 | |
345 | unreg: | |
346 | while (--i >= 0) | |
347 | blk_mq_unregister_hctx(q->queue_hw_ctx[i]); | |
348 | ||
1db4909e ML |
349 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
350 | kobject_del(q->mq_kobj); | |
f05d1ba7 BVA |
351 | kobject_put(&dev->kobj); |
352 | return ret; | |
2d0364c8 BVA |
353 | } |
354 | ||
67aec14c JA |
355 | void blk_mq_sysfs_unregister(struct request_queue *q) |
356 | { | |
357 | struct blk_mq_hw_ctx *hctx; | |
358 | int i; | |
359 | ||
cecf5d87 | 360 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 361 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 362 | goto unlock; |
4593fdbe | 363 | |
67aec14c JA |
364 | queue_for_each_hw_ctx(q, hctx, i) |
365 | blk_mq_unregister_hctx(hctx); | |
2d0364c8 BVA |
366 | |
367 | unlock: | |
cecf5d87 | 368 | mutex_unlock(&q->sysfs_dir_lock); |
67aec14c JA |
369 | } |
370 | ||
371 | int blk_mq_sysfs_register(struct request_queue *q) | |
372 | { | |
373 | struct blk_mq_hw_ctx *hctx; | |
374 | int i, ret = 0; | |
375 | ||
cecf5d87 | 376 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 377 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 378 | goto unlock; |
4593fdbe | 379 | |
67aec14c JA |
380 | queue_for_each_hw_ctx(q, hctx, i) { |
381 | ret = blk_mq_register_hctx(hctx); | |
382 | if (ret) | |
383 | break; | |
384 | } | |
385 | ||
2d0364c8 | 386 | unlock: |
cecf5d87 | 387 | mutex_unlock(&q->sysfs_dir_lock); |
2d0364c8 | 388 | |
67aec14c JA |
389 | return ret; |
390 | } |