Commit | Line | Data |
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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 | 38 | |
1b97871b ML |
39 | cancel_delayed_work_sync(&hctx->run_work); |
40 | ||
c7e2d94b ML |
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); | |
01388df3 | 45 | free_cpumask_var(hctx->cpumask); |
6c8b232e ML |
46 | kfree(hctx->ctxs); |
47 | kfree(hctx); | |
48 | } | |
49 | ||
320ae51f JA |
50 | struct 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 | ||
56 | struct 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 | ||
62 | static 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 | ||
85 | static 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 | ||
108 | static 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 | ||
131 | static 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 | ||
d96b37c0 OS |
155 | static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, |
156 | char *page) | |
bd166ef1 | 157 | { |
d96b37c0 | 158 | return sprintf(page, "%u\n", hctx->tags->nr_tags); |
bd166ef1 JA |
159 | } |
160 | ||
d96b37c0 OS |
161 | static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, |
162 | char *page) | |
320ae51f | 163 | { |
d96b37c0 | 164 | return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); |
320ae51f JA |
165 | } |
166 | ||
676141e4 JA |
167 | static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) |
168 | { | |
cb2da43e | 169 | unsigned int i, first = 1; |
676141e4 JA |
170 | ssize_t ret = 0; |
171 | ||
cb2da43e | 172 | for_each_cpu(i, hctx->cpumask) { |
676141e4 JA |
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 | ||
676141e4 JA |
181 | ret += sprintf(ret + page, "\n"); |
182 | return ret; | |
183 | } | |
184 | ||
d96b37c0 | 185 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { |
5657a819 | 186 | .attr = {.name = "nr_tags", .mode = 0444 }, |
d96b37c0 OS |
187 | .show = blk_mq_hw_sysfs_nr_tags_show, |
188 | }; | |
189 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { | |
5657a819 | 190 | .attr = {.name = "nr_reserved_tags", .mode = 0444 }, |
d96b37c0 OS |
191 | .show = blk_mq_hw_sysfs_nr_reserved_tags_show, |
192 | }; | |
676141e4 | 193 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
5657a819 | 194 | .attr = {.name = "cpu_list", .mode = 0444 }, |
676141e4 JA |
195 | .show = blk_mq_hw_sysfs_cpus_show, |
196 | }; | |
320ae51f JA |
197 | |
198 | static struct attribute *default_hw_ctx_attrs[] = { | |
d96b37c0 OS |
199 | &blk_mq_hw_sysfs_nr_tags.attr, |
200 | &blk_mq_hw_sysfs_nr_reserved_tags.attr, | |
676141e4 | 201 | &blk_mq_hw_sysfs_cpus.attr, |
320ae51f JA |
202 | NULL, |
203 | }; | |
800f5aa1 | 204 | ATTRIBUTE_GROUPS(default_hw_ctx); |
320ae51f JA |
205 | |
206 | static const struct sysfs_ops blk_mq_sysfs_ops = { | |
207 | .show = blk_mq_sysfs_show, | |
208 | .store = blk_mq_sysfs_store, | |
209 | }; | |
210 | ||
211 | static 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 | ||
216 | static struct kobj_type blk_mq_ktype = { | |
217 | .sysfs_ops = &blk_mq_sysfs_ops, | |
218 | .release = blk_mq_sysfs_release, | |
219 | }; | |
220 | ||
221 | static struct kobj_type blk_mq_ctx_ktype = { | |
222 | .sysfs_ops = &blk_mq_sysfs_ops, | |
1db4909e | 223 | .release = blk_mq_ctx_sysfs_release, |
320ae51f JA |
224 | }; |
225 | ||
226 | static struct kobj_type blk_mq_hw_ktype = { | |
227 | .sysfs_ops = &blk_mq_hw_sysfs_ops, | |
800f5aa1 | 228 | .default_groups = default_hw_ctx_groups, |
6c8b232e | 229 | .release = blk_mq_hw_sysfs_release, |
320ae51f JA |
230 | }; |
231 | ||
ee3c5db0 | 232 | static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
233 | { |
234 | struct blk_mq_ctx *ctx; | |
235 | int i; | |
236 | ||
4593fdbe | 237 | if (!hctx->nr_ctx) |
67aec14c JA |
238 | return; |
239 | ||
240 | hctx_for_each_ctx(hctx, ctx, i) | |
241 | kobject_del(&ctx->kobj); | |
242 | ||
243 | kobject_del(&hctx->kobj); | |
244 | } | |
245 | ||
ee3c5db0 | 246 | static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
247 | { |
248 | struct request_queue *q = hctx->queue; | |
249 | struct blk_mq_ctx *ctx; | |
250 | int i, ret; | |
251 | ||
4593fdbe | 252 | if (!hctx->nr_ctx) |
67aec14c JA |
253 | return 0; |
254 | ||
1db4909e | 255 | ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num); |
67aec14c JA |
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 | ||
667257e8 | 268 | void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
320ae51f | 269 | { |
85157366 | 270 | struct blk_mq_hw_ctx *hctx; |
7ea5fe31 | 271 | int i; |
85157366 | 272 | |
cecf5d87 | 273 | lockdep_assert_held(&q->sysfs_dir_lock); |
2d0364c8 | 274 | |
6c8b232e | 275 | queue_for_each_hw_ctx(q, hctx, i) |
67aec14c JA |
276 | blk_mq_unregister_hctx(hctx); |
277 | ||
1db4909e ML |
278 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
279 | kobject_del(q->mq_kobj); | |
b21d5b30 | 280 | kobject_put(&dev->kobj); |
4593fdbe AM |
281 | |
282 | q->mq_sysfs_init_done = false; | |
c0f3fd2b JA |
283 | } |
284 | ||
868f2f0b KB |
285 | void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) |
286 | { | |
287 | kobject_init(&hctx->kobj, &blk_mq_hw_ktype); | |
288 | } | |
289 | ||
7ea5fe31 ML |
290 | void 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 | } | |
1db4909e | 299 | kobject_put(q->mq_kobj); |
7ea5fe31 ML |
300 | } |
301 | ||
737f98cf | 302 | void blk_mq_sysfs_init(struct request_queue *q) |
67aec14c | 303 | { |
67aec14c | 304 | struct blk_mq_ctx *ctx; |
897bb0c7 | 305 | int cpu; |
67aec14c | 306 | |
1db4909e | 307 | kobject_init(q->mq_kobj, &blk_mq_ktype); |
67aec14c | 308 | |
897bb0c7 TG |
309 | for_each_possible_cpu(cpu) { |
310 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
1db4909e ML |
311 | |
312 | kobject_get(q->mq_kobj); | |
06a41a99 | 313 | kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
897bb0c7 | 314 | } |
67aec14c JA |
315 | } |
316 | ||
2d0364c8 | 317 | int __blk_mq_register_dev(struct device *dev, struct request_queue *q) |
320ae51f | 318 | { |
320ae51f | 319 | struct blk_mq_hw_ctx *hctx; |
67aec14c | 320 | int ret, i; |
320ae51f | 321 | |
2d0364c8 | 322 | WARN_ON_ONCE(!q->kobj.parent); |
cecf5d87 | 323 | lockdep_assert_held(&q->sysfs_dir_lock); |
4593fdbe | 324 | |
1db4909e | 325 | ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); |
320ae51f | 326 | if (ret < 0) |
4593fdbe | 327 | goto out; |
320ae51f | 328 | |
1db4909e | 329 | kobject_uevent(q->mq_kobj, KOBJ_ADD); |
320ae51f JA |
330 | |
331 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c | 332 | ret = blk_mq_register_hctx(hctx); |
320ae51f | 333 | if (ret) |
f05d1ba7 | 334 | goto unreg; |
320ae51f JA |
335 | } |
336 | ||
f05d1ba7 | 337 | q->mq_sysfs_init_done = true; |
2d0364c8 | 338 | |
4593fdbe | 339 | out: |
2d0364c8 | 340 | return ret; |
f05d1ba7 BVA |
341 | |
342 | unreg: | |
343 | while (--i >= 0) | |
344 | blk_mq_unregister_hctx(q->queue_hw_ctx[i]); | |
345 | ||
1db4909e ML |
346 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
347 | kobject_del(q->mq_kobj); | |
f05d1ba7 BVA |
348 | kobject_put(&dev->kobj); |
349 | return ret; | |
2d0364c8 BVA |
350 | } |
351 | ||
67aec14c JA |
352 | void blk_mq_sysfs_unregister(struct request_queue *q) |
353 | { | |
354 | struct blk_mq_hw_ctx *hctx; | |
355 | int i; | |
356 | ||
cecf5d87 | 357 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 358 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 359 | goto unlock; |
4593fdbe | 360 | |
67aec14c JA |
361 | queue_for_each_hw_ctx(q, hctx, i) |
362 | blk_mq_unregister_hctx(hctx); | |
2d0364c8 BVA |
363 | |
364 | unlock: | |
cecf5d87 | 365 | mutex_unlock(&q->sysfs_dir_lock); |
67aec14c JA |
366 | } |
367 | ||
368 | int blk_mq_sysfs_register(struct request_queue *q) | |
369 | { | |
370 | struct blk_mq_hw_ctx *hctx; | |
371 | int i, ret = 0; | |
372 | ||
cecf5d87 | 373 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 374 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 375 | goto unlock; |
4593fdbe | 376 | |
67aec14c JA |
377 | queue_for_each_hw_ctx(q, hctx, i) { |
378 | ret = blk_mq_register_hctx(hctx); | |
379 | if (ret) | |
380 | break; | |
381 | } | |
382 | ||
2d0364c8 | 383 | unlock: |
cecf5d87 | 384 | mutex_unlock(&q->sysfs_dir_lock); |
2d0364c8 | 385 | |
67aec14c JA |
386 | return ret; |
387 | } |