]>
Commit | Line | Data |
---|---|---|
320ae51f JA |
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> | |
84c8ff7f | 13 | #include "blk.h" |
320ae51f JA |
14 | #include "blk-mq.h" |
15 | #include "blk-mq-tag.h" | |
16 | ||
17 | static void blk_mq_sysfs_release(struct kobject *kobj) | |
18 | { | |
19 | } | |
20 | ||
6c8b232e ML |
21 | static void blk_mq_hw_sysfs_release(struct kobject *kobj) |
22 | { | |
23 | struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx, | |
24 | kobj); | |
84c8ff7f ML |
25 | |
26 | if (hctx->flags & BLK_MQ_F_BLOCKING) | |
27 | cleanup_srcu_struct(hctx->queue_rq_srcu); | |
28 | blk_free_flush_queue(hctx->fq); | |
29 | sbitmap_free(&hctx->ctx_map); | |
01388df3 | 30 | free_cpumask_var(hctx->cpumask); |
6c8b232e ML |
31 | kfree(hctx->ctxs); |
32 | kfree(hctx); | |
33 | } | |
34 | ||
320ae51f JA |
35 | struct blk_mq_ctx_sysfs_entry { |
36 | struct attribute attr; | |
37 | ssize_t (*show)(struct blk_mq_ctx *, char *); | |
38 | ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); | |
39 | }; | |
40 | ||
41 | struct blk_mq_hw_ctx_sysfs_entry { | |
42 | struct attribute attr; | |
43 | ssize_t (*show)(struct blk_mq_hw_ctx *, char *); | |
44 | ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); | |
45 | }; | |
46 | ||
47 | static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, | |
48 | char *page) | |
49 | { | |
50 | struct blk_mq_ctx_sysfs_entry *entry; | |
51 | struct blk_mq_ctx *ctx; | |
52 | struct request_queue *q; | |
53 | ssize_t res; | |
54 | ||
55 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
56 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
57 | q = ctx->queue; | |
58 | ||
59 | if (!entry->show) | |
60 | return -EIO; | |
61 | ||
62 | res = -ENOENT; | |
63 | mutex_lock(&q->sysfs_lock); | |
64 | if (!blk_queue_dying(q)) | |
65 | res = entry->show(ctx, page); | |
66 | mutex_unlock(&q->sysfs_lock); | |
67 | return res; | |
68 | } | |
69 | ||
70 | static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
71 | const char *page, size_t length) | |
72 | { | |
73 | struct blk_mq_ctx_sysfs_entry *entry; | |
74 | struct blk_mq_ctx *ctx; | |
75 | struct request_queue *q; | |
76 | ssize_t res; | |
77 | ||
78 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
79 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
80 | q = ctx->queue; | |
81 | ||
82 | if (!entry->store) | |
83 | return -EIO; | |
84 | ||
85 | res = -ENOENT; | |
86 | mutex_lock(&q->sysfs_lock); | |
87 | if (!blk_queue_dying(q)) | |
88 | res = entry->store(ctx, page, length); | |
89 | mutex_unlock(&q->sysfs_lock); | |
90 | return res; | |
91 | } | |
92 | ||
93 | static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, | |
94 | struct attribute *attr, char *page) | |
95 | { | |
96 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
97 | struct blk_mq_hw_ctx *hctx; | |
98 | struct request_queue *q; | |
99 | ssize_t res; | |
100 | ||
101 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
102 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
103 | q = hctx->queue; | |
104 | ||
105 | if (!entry->show) | |
106 | return -EIO; | |
107 | ||
108 | res = -ENOENT; | |
109 | mutex_lock(&q->sysfs_lock); | |
110 | if (!blk_queue_dying(q)) | |
111 | res = entry->show(hctx, page); | |
112 | mutex_unlock(&q->sysfs_lock); | |
113 | return res; | |
114 | } | |
115 | ||
116 | static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, | |
117 | struct attribute *attr, const char *page, | |
118 | size_t length) | |
119 | { | |
120 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
121 | struct blk_mq_hw_ctx *hctx; | |
122 | struct request_queue *q; | |
123 | ssize_t res; | |
124 | ||
125 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
126 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
127 | q = hctx->queue; | |
128 | ||
129 | if (!entry->store) | |
130 | return -EIO; | |
131 | ||
132 | res = -ENOENT; | |
133 | mutex_lock(&q->sysfs_lock); | |
134 | if (!blk_queue_dying(q)) | |
135 | res = entry->store(hctx, page, length); | |
136 | mutex_unlock(&q->sysfs_lock); | |
137 | return res; | |
138 | } | |
139 | ||
d96b37c0 OS |
140 | static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, |
141 | char *page) | |
bd166ef1 | 142 | { |
d96b37c0 | 143 | return sprintf(page, "%u\n", hctx->tags->nr_tags); |
bd166ef1 JA |
144 | } |
145 | ||
d96b37c0 OS |
146 | static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, |
147 | char *page) | |
320ae51f | 148 | { |
d96b37c0 | 149 | return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); |
320ae51f JA |
150 | } |
151 | ||
676141e4 JA |
152 | static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) |
153 | { | |
d00dc13c | 154 | const size_t size = PAGE_SIZE - 1; |
cb2da43e | 155 | unsigned int i, first = 1; |
d00dc13c | 156 | int ret = 0, pos = 0; |
676141e4 | 157 | |
cb2da43e | 158 | for_each_cpu(i, hctx->cpumask) { |
676141e4 | 159 | if (first) |
d00dc13c | 160 | ret = snprintf(pos + page, size - pos, "%u", i); |
676141e4 | 161 | else |
d00dc13c ML |
162 | ret = snprintf(pos + page, size - pos, ", %u", i); |
163 | ||
164 | if (ret >= size - pos) | |
165 | break; | |
676141e4 JA |
166 | |
167 | first = 0; | |
d00dc13c | 168 | pos += ret; |
676141e4 JA |
169 | } |
170 | ||
61fcd9bc | 171 | ret = snprintf(pos + page, size + 1 - pos, "\n"); |
d00dc13c | 172 | return pos + ret; |
676141e4 JA |
173 | } |
174 | ||
320ae51f | 175 | static struct attribute *default_ctx_attrs[] = { |
320ae51f JA |
176 | NULL, |
177 | }; | |
178 | ||
d96b37c0 OS |
179 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { |
180 | .attr = {.name = "nr_tags", .mode = S_IRUGO }, | |
181 | .show = blk_mq_hw_sysfs_nr_tags_show, | |
182 | }; | |
183 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { | |
184 | .attr = {.name = "nr_reserved_tags", .mode = S_IRUGO }, | |
185 | .show = blk_mq_hw_sysfs_nr_reserved_tags_show, | |
186 | }; | |
676141e4 JA |
187 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
188 | .attr = {.name = "cpu_list", .mode = S_IRUGO }, | |
189 | .show = blk_mq_hw_sysfs_cpus_show, | |
190 | }; | |
320ae51f JA |
191 | |
192 | static struct attribute *default_hw_ctx_attrs[] = { | |
d96b37c0 OS |
193 | &blk_mq_hw_sysfs_nr_tags.attr, |
194 | &blk_mq_hw_sysfs_nr_reserved_tags.attr, | |
676141e4 | 195 | &blk_mq_hw_sysfs_cpus.attr, |
320ae51f JA |
196 | NULL, |
197 | }; | |
198 | ||
199 | static const struct sysfs_ops blk_mq_sysfs_ops = { | |
200 | .show = blk_mq_sysfs_show, | |
201 | .store = blk_mq_sysfs_store, | |
202 | }; | |
203 | ||
204 | static const struct sysfs_ops blk_mq_hw_sysfs_ops = { | |
205 | .show = blk_mq_hw_sysfs_show, | |
206 | .store = blk_mq_hw_sysfs_store, | |
207 | }; | |
208 | ||
209 | static struct kobj_type blk_mq_ktype = { | |
210 | .sysfs_ops = &blk_mq_sysfs_ops, | |
211 | .release = blk_mq_sysfs_release, | |
212 | }; | |
213 | ||
214 | static struct kobj_type blk_mq_ctx_ktype = { | |
215 | .sysfs_ops = &blk_mq_sysfs_ops, | |
216 | .default_attrs = default_ctx_attrs, | |
74170118 | 217 | .release = blk_mq_sysfs_release, |
320ae51f JA |
218 | }; |
219 | ||
220 | static struct kobj_type blk_mq_hw_ktype = { | |
221 | .sysfs_ops = &blk_mq_hw_sysfs_ops, | |
222 | .default_attrs = default_hw_ctx_attrs, | |
6c8b232e | 223 | .release = blk_mq_hw_sysfs_release, |
320ae51f JA |
224 | }; |
225 | ||
ee3c5db0 | 226 | static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
227 | { |
228 | struct blk_mq_ctx *ctx; | |
229 | int i; | |
230 | ||
4593fdbe | 231 | if (!hctx->nr_ctx) |
67aec14c JA |
232 | return; |
233 | ||
234 | hctx_for_each_ctx(hctx, ctx, i) | |
235 | kobject_del(&ctx->kobj); | |
236 | ||
237 | kobject_del(&hctx->kobj); | |
238 | } | |
239 | ||
ee3c5db0 | 240 | static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
241 | { |
242 | struct request_queue *q = hctx->queue; | |
243 | struct blk_mq_ctx *ctx; | |
244 | int i, ret; | |
245 | ||
4593fdbe | 246 | if (!hctx->nr_ctx) |
67aec14c JA |
247 | return 0; |
248 | ||
249 | ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num); | |
250 | if (ret) | |
251 | return ret; | |
252 | ||
253 | hctx_for_each_ctx(hctx, ctx, i) { | |
254 | ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); | |
255 | if (ret) | |
256 | break; | |
257 | } | |
258 | ||
259 | return ret; | |
260 | } | |
261 | ||
b21d5b30 | 262 | static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
320ae51f | 263 | { |
85157366 | 264 | struct blk_mq_hw_ctx *hctx; |
7ea5fe31 | 265 | int i; |
85157366 | 266 | |
2d0364c8 BVA |
267 | lockdep_assert_held(&q->sysfs_lock); |
268 | ||
6c8b232e | 269 | queue_for_each_hw_ctx(q, hctx, i) |
67aec14c JA |
270 | blk_mq_unregister_hctx(hctx); |
271 | ||
320ae51f JA |
272 | kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); |
273 | kobject_del(&q->mq_kobj); | |
b21d5b30 | 274 | kobject_put(&dev->kobj); |
4593fdbe AM |
275 | |
276 | q->mq_sysfs_init_done = false; | |
c0f3fd2b JA |
277 | } |
278 | ||
b21d5b30 | 279 | void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
c0f3fd2b | 280 | { |
2d0364c8 | 281 | mutex_lock(&q->sysfs_lock); |
b21d5b30 | 282 | __blk_mq_unregister_dev(dev, q); |
2d0364c8 | 283 | mutex_unlock(&q->sysfs_lock); |
320ae51f JA |
284 | } |
285 | ||
868f2f0b KB |
286 | void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) |
287 | { | |
288 | kobject_init(&hctx->kobj, &blk_mq_hw_ktype); | |
289 | } | |
290 | ||
7ea5fe31 ML |
291 | void blk_mq_sysfs_deinit(struct request_queue *q) |
292 | { | |
293 | struct blk_mq_ctx *ctx; | |
294 | int cpu; | |
295 | ||
296 | for_each_possible_cpu(cpu) { | |
297 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
298 | kobject_put(&ctx->kobj); | |
299 | } | |
300 | kobject_put(&q->mq_kobj); | |
301 | } | |
302 | ||
737f98cf | 303 | void blk_mq_sysfs_init(struct request_queue *q) |
67aec14c | 304 | { |
67aec14c | 305 | struct blk_mq_ctx *ctx; |
897bb0c7 | 306 | int cpu; |
67aec14c JA |
307 | |
308 | kobject_init(&q->mq_kobj, &blk_mq_ktype); | |
309 | ||
897bb0c7 TG |
310 | for_each_possible_cpu(cpu) { |
311 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
06a41a99 | 312 | kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
897bb0c7 | 313 | } |
67aec14c JA |
314 | } |
315 | ||
2d0364c8 | 316 | int __blk_mq_register_dev(struct device *dev, struct request_queue *q) |
320ae51f | 317 | { |
320ae51f | 318 | struct blk_mq_hw_ctx *hctx; |
67aec14c | 319 | int ret, i; |
320ae51f | 320 | |
2d0364c8 BVA |
321 | WARN_ON_ONCE(!q->kobj.parent); |
322 | lockdep_assert_held(&q->sysfs_lock); | |
4593fdbe | 323 | |
320ae51f JA |
324 | ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); |
325 | if (ret < 0) | |
4593fdbe | 326 | goto out; |
320ae51f JA |
327 | |
328 | kobject_uevent(&q->mq_kobj, KOBJ_ADD); | |
329 | ||
330 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c | 331 | ret = blk_mq_register_hctx(hctx); |
320ae51f | 332 | if (ret) |
f05d1ba7 | 333 | goto unreg; |
320ae51f JA |
334 | } |
335 | ||
f05d1ba7 | 336 | q->mq_sysfs_init_done = true; |
2d0364c8 | 337 | |
4593fdbe | 338 | out: |
2d0364c8 | 339 | return ret; |
f05d1ba7 BVA |
340 | |
341 | unreg: | |
342 | while (--i >= 0) | |
343 | blk_mq_unregister_hctx(q->queue_hw_ctx[i]); | |
344 | ||
f05d1ba7 BVA |
345 | kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); |
346 | kobject_del(&q->mq_kobj); | |
347 | kobject_put(&dev->kobj); | |
348 | return ret; | |
2d0364c8 BVA |
349 | } |
350 | ||
351 | int blk_mq_register_dev(struct device *dev, struct request_queue *q) | |
352 | { | |
353 | int ret; | |
354 | ||
355 | mutex_lock(&q->sysfs_lock); | |
356 | ret = __blk_mq_register_dev(dev, q); | |
357 | mutex_unlock(&q->sysfs_lock); | |
320ae51f | 358 | |
4593fdbe | 359 | return ret; |
320ae51f | 360 | } |
b21d5b30 | 361 | EXPORT_SYMBOL_GPL(blk_mq_register_dev); |
67aec14c JA |
362 | |
363 | void blk_mq_sysfs_unregister(struct request_queue *q) | |
364 | { | |
365 | struct blk_mq_hw_ctx *hctx; | |
366 | int i; | |
367 | ||
2d0364c8 | 368 | mutex_lock(&q->sysfs_lock); |
4593fdbe | 369 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 370 | goto unlock; |
4593fdbe | 371 | |
67aec14c JA |
372 | queue_for_each_hw_ctx(q, hctx, i) |
373 | blk_mq_unregister_hctx(hctx); | |
2d0364c8 BVA |
374 | |
375 | unlock: | |
376 | mutex_unlock(&q->sysfs_lock); | |
67aec14c JA |
377 | } |
378 | ||
379 | int blk_mq_sysfs_register(struct request_queue *q) | |
380 | { | |
381 | struct blk_mq_hw_ctx *hctx; | |
382 | int i, ret = 0; | |
383 | ||
2d0364c8 | 384 | mutex_lock(&q->sysfs_lock); |
4593fdbe | 385 | if (!q->mq_sysfs_init_done) |
2d0364c8 | 386 | goto unlock; |
4593fdbe | 387 | |
67aec14c JA |
388 | queue_for_each_hw_ctx(q, hctx, i) { |
389 | ret = blk_mq_register_hctx(hctx); | |
390 | if (ret) | |
391 | break; | |
392 | } | |
393 | ||
2d0364c8 BVA |
394 | unlock: |
395 | mutex_unlock(&q->sysfs_lock); | |
396 | ||
67aec14c JA |
397 | return ret; |
398 | } |