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 | |
c7e2d94b ML |
39 | blk_free_flush_queue(hctx->fq); |
40 | sbitmap_free(&hctx->ctx_map); | |
01388df3 | 41 | free_cpumask_var(hctx->cpumask); |
6c8b232e ML |
42 | kfree(hctx->ctxs); |
43 | kfree(hctx); | |
44 | } | |
45 | ||
320ae51f JA |
46 | struct blk_mq_hw_ctx_sysfs_entry { |
47 | struct attribute attr; | |
48 | ssize_t (*show)(struct blk_mq_hw_ctx *, char *); | |
49 | ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); | |
50 | }; | |
51 | ||
320ae51f JA |
52 | static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, |
53 | struct attribute *attr, char *page) | |
54 | { | |
55 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
56 | struct blk_mq_hw_ctx *hctx; | |
57 | struct request_queue *q; | |
58 | ssize_t res; | |
59 | ||
60 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
61 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
62 | q = hctx->queue; | |
63 | ||
64 | if (!entry->show) | |
65 | return -EIO; | |
66 | ||
320ae51f | 67 | mutex_lock(&q->sysfs_lock); |
bae85c15 | 68 | res = entry->show(hctx, page); |
320ae51f JA |
69 | mutex_unlock(&q->sysfs_lock); |
70 | return res; | |
71 | } | |
72 | ||
73 | static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, | |
74 | struct attribute *attr, const char *page, | |
75 | size_t length) | |
76 | { | |
77 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
78 | struct blk_mq_hw_ctx *hctx; | |
79 | struct request_queue *q; | |
80 | ssize_t res; | |
81 | ||
82 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
83 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
84 | q = hctx->queue; | |
85 | ||
86 | if (!entry->store) | |
87 | return -EIO; | |
88 | ||
320ae51f | 89 | mutex_lock(&q->sysfs_lock); |
bae85c15 | 90 | res = entry->store(hctx, page, length); |
320ae51f JA |
91 | mutex_unlock(&q->sysfs_lock); |
92 | return res; | |
93 | } | |
94 | ||
d96b37c0 OS |
95 | static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, |
96 | char *page) | |
bd166ef1 | 97 | { |
d96b37c0 | 98 | return sprintf(page, "%u\n", hctx->tags->nr_tags); |
bd166ef1 JA |
99 | } |
100 | ||
d96b37c0 OS |
101 | static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, |
102 | char *page) | |
320ae51f | 103 | { |
d96b37c0 | 104 | return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); |
320ae51f JA |
105 | } |
106 | ||
676141e4 JA |
107 | static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) |
108 | { | |
8962842c | 109 | const size_t size = PAGE_SIZE - 1; |
cb2da43e | 110 | unsigned int i, first = 1; |
8962842c | 111 | int ret = 0, pos = 0; |
676141e4 | 112 | |
cb2da43e | 113 | for_each_cpu(i, hctx->cpumask) { |
676141e4 | 114 | if (first) |
8962842c | 115 | ret = snprintf(pos + page, size - pos, "%u", i); |
676141e4 | 116 | else |
8962842c ML |
117 | ret = snprintf(pos + page, size - pos, ", %u", i); |
118 | ||
119 | if (ret >= size - pos) | |
120 | break; | |
676141e4 JA |
121 | |
122 | first = 0; | |
8962842c | 123 | pos += ret; |
676141e4 JA |
124 | } |
125 | ||
d2c9be89 | 126 | ret = snprintf(pos + page, size + 1 - pos, "\n"); |
8962842c | 127 | return pos + ret; |
676141e4 JA |
128 | } |
129 | ||
d96b37c0 | 130 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { |
5657a819 | 131 | .attr = {.name = "nr_tags", .mode = 0444 }, |
d96b37c0 OS |
132 | .show = blk_mq_hw_sysfs_nr_tags_show, |
133 | }; | |
134 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { | |
5657a819 | 135 | .attr = {.name = "nr_reserved_tags", .mode = 0444 }, |
d96b37c0 OS |
136 | .show = blk_mq_hw_sysfs_nr_reserved_tags_show, |
137 | }; | |
676141e4 | 138 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
5657a819 | 139 | .attr = {.name = "cpu_list", .mode = 0444 }, |
676141e4 JA |
140 | .show = blk_mq_hw_sysfs_cpus_show, |
141 | }; | |
320ae51f JA |
142 | |
143 | static struct attribute *default_hw_ctx_attrs[] = { | |
d96b37c0 OS |
144 | &blk_mq_hw_sysfs_nr_tags.attr, |
145 | &blk_mq_hw_sysfs_nr_reserved_tags.attr, | |
676141e4 | 146 | &blk_mq_hw_sysfs_cpus.attr, |
320ae51f JA |
147 | NULL, |
148 | }; | |
800f5aa1 | 149 | ATTRIBUTE_GROUPS(default_hw_ctx); |
320ae51f | 150 | |
320ae51f JA |
151 | static const struct sysfs_ops blk_mq_hw_sysfs_ops = { |
152 | .show = blk_mq_hw_sysfs_show, | |
153 | .store = blk_mq_hw_sysfs_store, | |
154 | }; | |
155 | ||
156 | static struct kobj_type blk_mq_ktype = { | |
320ae51f JA |
157 | .release = blk_mq_sysfs_release, |
158 | }; | |
159 | ||
160 | static struct kobj_type blk_mq_ctx_ktype = { | |
1db4909e | 161 | .release = blk_mq_ctx_sysfs_release, |
320ae51f JA |
162 | }; |
163 | ||
164 | static struct kobj_type blk_mq_hw_ktype = { | |
165 | .sysfs_ops = &blk_mq_hw_sysfs_ops, | |
800f5aa1 | 166 | .default_groups = default_hw_ctx_groups, |
6c8b232e | 167 | .release = blk_mq_hw_sysfs_release, |
320ae51f JA |
168 | }; |
169 | ||
ee3c5db0 | 170 | static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
171 | { |
172 | struct blk_mq_ctx *ctx; | |
173 | int i; | |
174 | ||
4593fdbe | 175 | if (!hctx->nr_ctx) |
67aec14c JA |
176 | return; |
177 | ||
178 | hctx_for_each_ctx(hctx, ctx, i) | |
179 | kobject_del(&ctx->kobj); | |
180 | ||
181 | kobject_del(&hctx->kobj); | |
182 | } | |
183 | ||
ee3c5db0 | 184 | static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
185 | { |
186 | struct request_queue *q = hctx->queue; | |
187 | struct blk_mq_ctx *ctx; | |
188 | int i, ret; | |
189 | ||
4593fdbe | 190 | if (!hctx->nr_ctx) |
67aec14c JA |
191 | return 0; |
192 | ||
1db4909e | 193 | ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num); |
67aec14c JA |
194 | if (ret) |
195 | return ret; | |
196 | ||
197 | hctx_for_each_ctx(hctx, ctx, i) { | |
198 | ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); | |
199 | if (ret) | |
200 | break; | |
201 | } | |
202 | ||
203 | return ret; | |
204 | } | |
205 | ||
667257e8 | 206 | void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
320ae51f | 207 | { |
85157366 | 208 | struct blk_mq_hw_ctx *hctx; |
7ea5fe31 | 209 | int i; |
85157366 | 210 | |
cecf5d87 | 211 | lockdep_assert_held(&q->sysfs_dir_lock); |
2d0364c8 | 212 | |
6c8b232e | 213 | queue_for_each_hw_ctx(q, hctx, i) |
67aec14c JA |
214 | blk_mq_unregister_hctx(hctx); |
215 | ||
1db4909e ML |
216 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
217 | kobject_del(q->mq_kobj); | |
b21d5b30 | 218 | kobject_put(&dev->kobj); |
4593fdbe AM |
219 | |
220 | q->mq_sysfs_init_done = false; | |
c0f3fd2b JA |
221 | } |
222 | ||
868f2f0b KB |
223 | void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) |
224 | { | |
225 | kobject_init(&hctx->kobj, &blk_mq_hw_ktype); | |
226 | } | |
227 | ||
7ea5fe31 ML |
228 | void blk_mq_sysfs_deinit(struct request_queue *q) |
229 | { | |
230 | struct blk_mq_ctx *ctx; | |
231 | int cpu; | |
232 | ||
233 | for_each_possible_cpu(cpu) { | |
234 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
235 | kobject_put(&ctx->kobj); | |
236 | } | |
1db4909e | 237 | kobject_put(q->mq_kobj); |
7ea5fe31 ML |
238 | } |
239 | ||
737f98cf | 240 | void blk_mq_sysfs_init(struct request_queue *q) |
67aec14c | 241 | { |
67aec14c | 242 | struct blk_mq_ctx *ctx; |
897bb0c7 | 243 | int cpu; |
67aec14c | 244 | |
1db4909e | 245 | kobject_init(q->mq_kobj, &blk_mq_ktype); |
67aec14c | 246 | |
897bb0c7 TG |
247 | for_each_possible_cpu(cpu) { |
248 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
1db4909e ML |
249 | |
250 | kobject_get(q->mq_kobj); | |
06a41a99 | 251 | kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
897bb0c7 | 252 | } |
67aec14c JA |
253 | } |
254 | ||
2d0364c8 | 255 | int __blk_mq_register_dev(struct device *dev, struct request_queue *q) |
320ae51f | 256 | { |
320ae51f | 257 | struct blk_mq_hw_ctx *hctx; |
67aec14c | 258 | int ret, i; |
320ae51f | 259 | |
2d0364c8 | 260 | WARN_ON_ONCE(!q->kobj.parent); |
cecf5d87 | 261 | lockdep_assert_held(&q->sysfs_dir_lock); |
4593fdbe | 262 | |
1db4909e | 263 | ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); |
320ae51f | 264 | if (ret < 0) |
4593fdbe | 265 | goto out; |
320ae51f | 266 | |
1db4909e | 267 | kobject_uevent(q->mq_kobj, KOBJ_ADD); |
320ae51f JA |
268 | |
269 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c | 270 | ret = blk_mq_register_hctx(hctx); |
320ae51f | 271 | if (ret) |
f05d1ba7 | 272 | goto unreg; |
320ae51f JA |
273 | } |
274 | ||
f05d1ba7 | 275 | q->mq_sysfs_init_done = true; |
2d0364c8 | 276 | |
4593fdbe | 277 | out: |
2d0364c8 | 278 | return ret; |
f05d1ba7 BVA |
279 | |
280 | unreg: | |
281 | while (--i >= 0) | |
282 | blk_mq_unregister_hctx(q->queue_hw_ctx[i]); | |
283 | ||
1db4909e ML |
284 | kobject_uevent(q->mq_kobj, KOBJ_REMOVE); |
285 | kobject_del(q->mq_kobj); | |
f05d1ba7 BVA |
286 | kobject_put(&dev->kobj); |
287 | return ret; | |
2d0364c8 BVA |
288 | } |
289 | ||
67aec14c JA |
290 | void blk_mq_sysfs_unregister(struct request_queue *q) |
291 | { | |
292 | struct blk_mq_hw_ctx *hctx; | |
293 | int i; | |
294 | ||
cecf5d87 | 295 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 296 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 297 | goto unlock; |
4593fdbe | 298 | |
67aec14c JA |
299 | queue_for_each_hw_ctx(q, hctx, i) |
300 | blk_mq_unregister_hctx(hctx); | |
2d0364c8 BVA |
301 | |
302 | unlock: | |
cecf5d87 | 303 | mutex_unlock(&q->sysfs_dir_lock); |
67aec14c JA |
304 | } |
305 | ||
306 | int blk_mq_sysfs_register(struct request_queue *q) | |
307 | { | |
308 | struct blk_mq_hw_ctx *hctx; | |
309 | int i, ret = 0; | |
310 | ||
cecf5d87 | 311 | mutex_lock(&q->sysfs_dir_lock); |
4593fdbe | 312 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 313 | goto unlock; |
4593fdbe | 314 | |
67aec14c JA |
315 | queue_for_each_hw_ctx(q, hctx, i) { |
316 | ret = blk_mq_register_hctx(hctx); | |
317 | if (ret) | |
318 | break; | |
319 | } | |
320 | ||
2d0364c8 | 321 | unlock: |
cecf5d87 | 322 | mutex_unlock(&q->sysfs_dir_lock); |
2d0364c8 | 323 | |
67aec14c JA |
324 | return ret; |
325 | } |