1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/backing-dev.h>
5 #include <linux/blkdev.h>
7 #include <linux/init.h>
8 #include <linux/slab.h>
9 #include <linux/workqueue.h>
10 #include <linux/smp.h>
12 #include <linux/blk-mq.h>
15 #include "blk-mq-tag.h"
17 static void blk_mq_sysfs_release(struct kobject *kobj)
21 static void blk_mq_hw_sysfs_release(struct kobject *kobj)
23 struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
26 if (hctx->flags & BLK_MQ_F_BLOCKING)
27 cleanup_srcu_struct(hctx->srcu);
28 blk_free_flush_queue(hctx->fq);
29 sbitmap_free(&hctx->ctx_map);
30 free_cpumask_var(hctx->cpumask);
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);
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);
47 static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
50 struct blk_mq_ctx_sysfs_entry *entry;
51 struct blk_mq_ctx *ctx;
52 struct request_queue *q;
55 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
56 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
63 mutex_lock(&q->sysfs_lock);
64 if (!blk_queue_dying(q))
65 res = entry->show(ctx, page);
66 mutex_unlock(&q->sysfs_lock);
70 static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
71 const char *page, size_t length)
73 struct blk_mq_ctx_sysfs_entry *entry;
74 struct blk_mq_ctx *ctx;
75 struct request_queue *q;
78 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
79 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
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);
93 static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
94 struct attribute *attr, char *page)
96 struct blk_mq_hw_ctx_sysfs_entry *entry;
97 struct blk_mq_hw_ctx *hctx;
98 struct request_queue *q;
101 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
102 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
109 mutex_lock(&q->sysfs_lock);
110 if (!blk_queue_dying(q))
111 res = entry->show(hctx, page);
112 mutex_unlock(&q->sysfs_lock);
116 static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
117 struct attribute *attr, const char *page,
120 struct blk_mq_hw_ctx_sysfs_entry *entry;
121 struct blk_mq_hw_ctx *hctx;
122 struct request_queue *q;
125 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
126 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
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);
140 static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
143 return sprintf(page, "%u\n", hctx->tags->nr_tags);
146 static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
149 return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
152 static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
154 unsigned int i, first = 1;
157 for_each_cpu(i, hctx->cpumask) {
159 ret += sprintf(ret + page, "%u", i);
161 ret += sprintf(ret + page, ", %u", i);
166 ret += sprintf(ret + page, "\n");
170 static struct attribute *default_ctx_attrs[] = {
174 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
175 .attr = {.name = "nr_tags", .mode = 0444 },
176 .show = blk_mq_hw_sysfs_nr_tags_show,
178 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
179 .attr = {.name = "nr_reserved_tags", .mode = 0444 },
180 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
182 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
183 .attr = {.name = "cpu_list", .mode = 0444 },
184 .show = blk_mq_hw_sysfs_cpus_show,
187 static struct attribute *default_hw_ctx_attrs[] = {
188 &blk_mq_hw_sysfs_nr_tags.attr,
189 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
190 &blk_mq_hw_sysfs_cpus.attr,
194 static const struct sysfs_ops blk_mq_sysfs_ops = {
195 .show = blk_mq_sysfs_show,
196 .store = blk_mq_sysfs_store,
199 static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
200 .show = blk_mq_hw_sysfs_show,
201 .store = blk_mq_hw_sysfs_store,
204 static struct kobj_type blk_mq_ktype = {
205 .sysfs_ops = &blk_mq_sysfs_ops,
206 .release = blk_mq_sysfs_release,
209 static struct kobj_type blk_mq_ctx_ktype = {
210 .sysfs_ops = &blk_mq_sysfs_ops,
211 .default_attrs = default_ctx_attrs,
212 .release = blk_mq_sysfs_release,
215 static struct kobj_type blk_mq_hw_ktype = {
216 .sysfs_ops = &blk_mq_hw_sysfs_ops,
217 .default_attrs = default_hw_ctx_attrs,
218 .release = blk_mq_hw_sysfs_release,
221 static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
223 struct blk_mq_ctx *ctx;
229 hctx_for_each_ctx(hctx, ctx, i)
230 kobject_del(&ctx->kobj);
232 kobject_del(&hctx->kobj);
235 static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
237 struct request_queue *q = hctx->queue;
238 struct blk_mq_ctx *ctx;
244 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
248 hctx_for_each_ctx(hctx, ctx, i) {
249 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
257 void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
259 struct blk_mq_hw_ctx *hctx;
262 lockdep_assert_held(&q->sysfs_lock);
264 queue_for_each_hw_ctx(q, hctx, i)
265 blk_mq_unregister_hctx(hctx);
267 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
268 kobject_del(&q->mq_kobj);
269 kobject_put(&dev->kobj);
271 q->mq_sysfs_init_done = false;
274 void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
276 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
279 void blk_mq_sysfs_deinit(struct request_queue *q)
281 struct blk_mq_ctx *ctx;
284 for_each_possible_cpu(cpu) {
285 ctx = per_cpu_ptr(q->queue_ctx, cpu);
286 kobject_put(&ctx->kobj);
288 kobject_put(&q->mq_kobj);
291 void blk_mq_sysfs_init(struct request_queue *q)
293 struct blk_mq_ctx *ctx;
296 kobject_init(&q->mq_kobj, &blk_mq_ktype);
298 for_each_possible_cpu(cpu) {
299 ctx = per_cpu_ptr(q->queue_ctx, cpu);
300 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
304 int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
306 struct blk_mq_hw_ctx *hctx;
309 WARN_ON_ONCE(!q->kobj.parent);
310 lockdep_assert_held(&q->sysfs_lock);
312 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
316 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
318 queue_for_each_hw_ctx(q, hctx, i) {
319 ret = blk_mq_register_hctx(hctx);
324 q->mq_sysfs_init_done = true;
331 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
333 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
334 kobject_del(&q->mq_kobj);
335 kobject_put(&dev->kobj);
339 int blk_mq_register_dev(struct device *dev, struct request_queue *q)
343 mutex_lock(&q->sysfs_lock);
344 ret = __blk_mq_register_dev(dev, q);
345 mutex_unlock(&q->sysfs_lock);
349 EXPORT_SYMBOL_GPL(blk_mq_register_dev);
351 void blk_mq_sysfs_unregister(struct request_queue *q)
353 struct blk_mq_hw_ctx *hctx;
356 mutex_lock(&q->sysfs_lock);
357 if (!q->mq_sysfs_init_done)
360 queue_for_each_hw_ctx(q, hctx, i)
361 blk_mq_unregister_hctx(hctx);
364 mutex_unlock(&q->sysfs_lock);
367 int blk_mq_sysfs_register(struct request_queue *q)
369 struct blk_mq_hw_ctx *hctx;
372 mutex_lock(&q->sysfs_lock);
373 if (!q->mq_sysfs_init_done)
376 queue_for_each_hw_ctx(q, hctx, i) {
377 ret = blk_mq_register_hctx(hctx);
383 mutex_unlock(&q->sysfs_lock);