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 | ||
320ae51f | 77 | mutex_lock(&q->sysfs_lock); |
bae85c15 | 78 | res = entry->show(ctx, page); |
320ae51f JA |
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 | ||
320ae51f | 98 | mutex_lock(&q->sysfs_lock); |
bae85c15 | 99 | res = entry->store(ctx, page, length); |
320ae51f JA |
100 | mutex_unlock(&q->sysfs_lock); |
101 | return res; | |
102 | } | |
103 | ||
104 | static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, | |
105 | struct attribute *attr, char *page) | |
106 | { | |
107 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
108 | struct blk_mq_hw_ctx *hctx; | |
109 | struct request_queue *q; | |
110 | ssize_t res; | |
111 | ||
112 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
113 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
114 | q = hctx->queue; | |
115 | ||
116 | if (!entry->show) | |
117 | return -EIO; | |
118 | ||
320ae51f | 119 | mutex_lock(&q->sysfs_lock); |
bae85c15 | 120 | res = entry->show(hctx, page); |
320ae51f JA |
121 | mutex_unlock(&q->sysfs_lock); |
122 | return res; | |
123 | } | |
124 | ||
125 | static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, | |
126 | struct attribute *attr, const char *page, | |
127 | size_t length) | |
128 | { | |
129 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
130 | struct blk_mq_hw_ctx *hctx; | |
131 | struct request_queue *q; | |
132 | ssize_t res; | |
133 | ||
134 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
135 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
136 | q = hctx->queue; | |
137 | ||
138 | if (!entry->store) | |
139 | return -EIO; | |
140 | ||
320ae51f | 141 | mutex_lock(&q->sysfs_lock); |
bae85c15 | 142 | res = entry->store(hctx, page, length); |
320ae51f JA |
143 | mutex_unlock(&q->sysfs_lock); |
144 | return res; | |
145 | } | |
146 | ||
d96b37c0 OS |
147 | static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, |
148 | char *page) | |
bd166ef1 | 149 | { |
d96b37c0 | 150 | return sprintf(page, "%u\n", hctx->tags->nr_tags); |
bd166ef1 JA |
151 | } |
152 | ||
d96b37c0 OS |
153 | static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, |
154 | char *page) | |
320ae51f | 155 | { |
d96b37c0 | 156 | return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); |
320ae51f JA |
157 | } |
158 | ||
676141e4 JA |
159 | static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) |
160 | { | |
8962842c | 161 | const size_t size = PAGE_SIZE - 1; |
cb2da43e | 162 | unsigned int i, first = 1; |
8962842c | 163 | int ret = 0, pos = 0; |
676141e4 | 164 | |
cb2da43e | 165 | for_each_cpu(i, hctx->cpumask) { |
676141e4 | 166 | if (first) |
8962842c | 167 | ret = snprintf(pos + page, size - pos, "%u", i); |
676141e4 | 168 | else |
8962842c ML |
169 | ret = snprintf(pos + page, size - pos, ", %u", i); |
170 | ||
171 | if (ret >= size - pos) | |
172 | break; | |
676141e4 JA |
173 | |
174 | first = 0; | |
8962842c | 175 | pos += ret; |
676141e4 JA |
176 | } |
177 | ||
d2c9be89 | 178 | ret = snprintf(pos + page, size + 1 - pos, "\n"); |
8962842c | 179 | return pos + ret; |
676141e4 JA |
180 | } |
181 | ||
d96b37c0 | 182 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { |
5657a819 | 183 | .attr = {.name = "nr_tags", .mode = 0444 }, |
d96b37c0 OS |
184 | .show = blk_mq_hw_sysfs_nr_tags_show, |
185 | }; | |
186 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { | |
5657a819 | 187 | .attr = {.name = "nr_reserved_tags", .mode = 0444 }, |
d96b37c0 OS |
188 | .show = blk_mq_hw_sysfs_nr_reserved_tags_show, |
189 | }; | |
676141e4 | 190 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
5657a819 | 191 | .attr = {.name = "cpu_list", .mode = 0444 }, |
676141e4 JA |
192 | .show = blk_mq_hw_sysfs_cpus_show, |
193 | }; | |
320ae51f JA |
194 | |
195 | static struct attribute *default_hw_ctx_attrs[] = { | |
d96b37c0 OS |
196 | &blk_mq_hw_sysfs_nr_tags.attr, |
197 | &blk_mq_hw_sysfs_nr_reserved_tags.attr, | |
676141e4 | 198 | &blk_mq_hw_sysfs_cpus.attr, |
320ae51f JA |
199 | NULL, |
200 | }; | |
800f5aa1 | 201 | ATTRIBUTE_GROUPS(default_hw_ctx); |
320ae51f JA |
202 | |
203 | static const struct sysfs_ops blk_mq_sysfs_ops = { | |
204 | .show = blk_mq_sysfs_show, | |
205 | .store = blk_mq_sysfs_store, | |
206 | }; | |
207 | ||
208 | static const struct sysfs_ops blk_mq_hw_sysfs_ops = { | |
209 | .show = blk_mq_hw_sysfs_show, | |
210 | .store = blk_mq_hw_sysfs_store, | |
211 | }; | |
212 | ||
213 | static struct kobj_type blk_mq_ktype = { | |
214 | .sysfs_ops = &blk_mq_sysfs_ops, | |
215 | .release = blk_mq_sysfs_release, | |
216 | }; | |
217 | ||
218 | static struct kobj_type blk_mq_ctx_ktype = { | |
219 | .sysfs_ops = &blk_mq_sysfs_ops, | |
1db4909e | 220 | .release = blk_mq_ctx_sysfs_release, |
320ae51f JA |
221 | }; |
222 | ||
223 | static struct kobj_type blk_mq_hw_ktype = { | |
224 | .sysfs_ops = &blk_mq_hw_sysfs_ops, | |
800f5aa1 | 225 | .default_groups = default_hw_ctx_groups, |
6c8b232e | 226 | .release = blk_mq_hw_sysfs_release, |
320ae51f JA |
227 | }; |
228 | ||
ee3c5db0 | 229 | static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
230 | { |
231 | struct blk_mq_ctx *ctx; | |
232 | int i; | |
233 | ||
4593fdbe | 234 | if (!hctx->nr_ctx) |
67aec14c JA |
235 | return; |
236 | ||
237 | hctx_for_each_ctx(hctx, ctx, i) | |
238 | kobject_del(&ctx->kobj); | |
239 | ||
240 | kobject_del(&hctx->kobj); | |
241 | } | |
242 | ||
ee3c5db0 | 243 | static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
244 | { |
245 | struct request_queue *q = hctx->queue; | |
246 | struct blk_mq_ctx *ctx; | |
247 | int i, ret; | |
248 | ||
4593fdbe | 249 | if (!hctx->nr_ctx) |
67aec14c JA |
250 | return 0; |
251 | ||
1db4909e | 252 | ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num); |
67aec14c JA |
253 | if (ret) |
254 | return ret; | |
255 | ||
256 | hctx_for_each_ctx(hctx, ctx, i) { | |
257 | ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); | |
258 | if (ret) | |
259 | break; | |
260 | } | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
667257e8 | 265 | void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
320ae51f | 266 | { |
85157366 | 267 | struct blk_mq_hw_ctx *hctx; |
7ea5fe31 | 268 | int i; |
85157366 | 269 | |
cecf5d87 | 270 | lockdep_assert_held(&q->sysfs_dir_lock); |
2d0364c8 | 271 | |
6c8b232e | 272 | queue_for_each_hw_ctx(q, hctx, i) |
67aec14c JA |
273 | blk_mq_unregister_hctx(hctx); |
274 | ||
1db4909e ML |
275 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
276 | kobject_del(q->mq_kobj); | |
b21d5b30 | 277 | kobject_put(&dev->kobj); |
4593fdbe AM |
278 | |
279 | q->mq_sysfs_init_done = false; | |
c0f3fd2b JA |
280 | } |
281 | ||
868f2f0b KB |
282 | void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) |
283 | { | |
284 | kobject_init(&hctx->kobj, &blk_mq_hw_ktype); | |
285 | } | |
286 | ||
7ea5fe31 ML |
287 | void blk_mq_sysfs_deinit(struct request_queue *q) |
288 | { | |
289 | struct blk_mq_ctx *ctx; | |
290 | int cpu; | |
291 | ||
292 | for_each_possible_cpu(cpu) { | |
293 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
294 | kobject_put(&ctx->kobj); | |
295 | } | |
1db4909e | 296 | kobject_put(q->mq_kobj); |
7ea5fe31 ML |
297 | } |
298 | ||
737f98cf | 299 | void blk_mq_sysfs_init(struct request_queue *q) |
67aec14c | 300 | { |
67aec14c | 301 | struct blk_mq_ctx *ctx; |
897bb0c7 | 302 | int cpu; |
67aec14c | 303 | |
1db4909e | 304 | kobject_init(q->mq_kobj, &blk_mq_ktype); |
67aec14c | 305 | |
897bb0c7 TG |
306 | for_each_possible_cpu(cpu) { |
307 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
1db4909e ML |
308 | |
309 | kobject_get(q->mq_kobj); | |
06a41a99 | 310 | kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
897bb0c7 | 311 | } |
67aec14c JA |
312 | } |
313 | ||
2d0364c8 | 314 | int __blk_mq_register_dev(struct device *dev, struct request_queue *q) |
320ae51f | 315 | { |
320ae51f | 316 | struct blk_mq_hw_ctx *hctx; |
67aec14c | 317 | int ret, i; |
320ae51f | 318 | |
2d0364c8 | 319 | WARN_ON_ONCE(!q->kobj.parent); |
cecf5d87 | 320 | lockdep_assert_held(&q->sysfs_dir_lock); |
4593fdbe | 321 | |
1db4909e | 322 | ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); |
320ae51f | 323 | if (ret < 0) |
4593fdbe | 324 | goto out; |
320ae51f | 325 | |
1db4909e | 326 | kobject_uevent(q->mq_kobj, KOBJ_ADD); |
320ae51f JA |
327 | |
328 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c | 329 | ret = blk_mq_register_hctx(hctx); |
320ae51f | 330 | if (ret) |
f05d1ba7 | 331 | goto unreg; |
320ae51f JA |
332 | } |
333 | ||
f05d1ba7 | 334 | q->mq_sysfs_init_done = true; |
2d0364c8 | 335 | |
4593fdbe | 336 | out: |
2d0364c8 | 337 | return ret; |
f05d1ba7 BVA |
338 | |
339 | unreg: | |
340 | while (--i >= 0) | |
341 | blk_mq_unregister_hctx(q->queue_hw_ctx[i]); | |
342 | ||
1db4909e ML |
343 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
344 | kobject_del(q->mq_kobj); | |
f05d1ba7 BVA |
345 | kobject_put(&dev->kobj); |
346 | return ret; | |
2d0364c8 BVA |
347 | } |
348 | ||
67aec14c JA |
349 | void blk_mq_sysfs_unregister(struct request_queue *q) |
350 | { | |
351 | struct blk_mq_hw_ctx *hctx; | |
352 | int i; | |
353 | ||
cecf5d87 | 354 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 355 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 356 | goto unlock; |
4593fdbe | 357 | |
67aec14c JA |
358 | queue_for_each_hw_ctx(q, hctx, i) |
359 | blk_mq_unregister_hctx(hctx); | |
2d0364c8 BVA |
360 | |
361 | unlock: | |
cecf5d87 | 362 | mutex_unlock(&q->sysfs_dir_lock); |
67aec14c JA |
363 | } |
364 | ||
365 | int blk_mq_sysfs_register(struct request_queue *q) | |
366 | { | |
367 | struct blk_mq_hw_ctx *hctx; | |
368 | int i, ret = 0; | |
369 | ||
cecf5d87 | 370 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 371 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 372 | goto unlock; |
4593fdbe | 373 | |
67aec14c JA |
374 | queue_for_each_hw_ctx(q, hctx, i) { |
375 | ret = blk_mq_register_hctx(hctx); | |
376 | if (ret) | |
377 | break; | |
378 | } | |
379 | ||
2d0364c8 | 380 | unlock: |
cecf5d87 | 381 | mutex_unlock(&q->sysfs_dir_lock); |
2d0364c8 | 382 | |
67aec14c JA |
383 | return ret; |
384 | } |