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>
14 #include "blk-mq-tag.h"
16 static void blk_mq_sysfs_release(struct kobject *kobj)
20 static void blk_mq_hw_sysfs_release(struct kobject *kobj)
22 struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
24 free_cpumask_var(hctx->cpumask);
29 struct blk_mq_ctx_sysfs_entry {
30 struct attribute attr;
31 ssize_t (*show)(struct blk_mq_ctx *, char *);
32 ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
35 struct blk_mq_hw_ctx_sysfs_entry {
36 struct attribute attr;
37 ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
38 ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
41 static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
44 struct blk_mq_ctx_sysfs_entry *entry;
45 struct blk_mq_ctx *ctx;
46 struct request_queue *q;
49 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
50 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
57 mutex_lock(&q->sysfs_lock);
58 if (!blk_queue_dying(q))
59 res = entry->show(ctx, page);
60 mutex_unlock(&q->sysfs_lock);
64 static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
65 const char *page, size_t length)
67 struct blk_mq_ctx_sysfs_entry *entry;
68 struct blk_mq_ctx *ctx;
69 struct request_queue *q;
72 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
73 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
80 mutex_lock(&q->sysfs_lock);
81 if (!blk_queue_dying(q))
82 res = entry->store(ctx, page, length);
83 mutex_unlock(&q->sysfs_lock);
87 static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
88 struct attribute *attr, char *page)
90 struct blk_mq_hw_ctx_sysfs_entry *entry;
91 struct blk_mq_hw_ctx *hctx;
92 struct request_queue *q;
95 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
96 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
103 mutex_lock(&q->sysfs_lock);
104 if (!blk_queue_dying(q))
105 res = entry->show(hctx, page);
106 mutex_unlock(&q->sysfs_lock);
110 static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
111 struct attribute *attr, const char *page,
114 struct blk_mq_hw_ctx_sysfs_entry *entry;
115 struct blk_mq_hw_ctx *hctx;
116 struct request_queue *q;
119 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
120 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
127 mutex_lock(&q->sysfs_lock);
128 if (!blk_queue_dying(q))
129 res = entry->store(hctx, page, length);
130 mutex_unlock(&q->sysfs_lock);
134 static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
137 return sprintf(page, "%u\n", hctx->tags->nr_tags);
140 static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
143 return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
146 static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
148 const size_t size = PAGE_SIZE - 1;
149 unsigned int i, first = 1;
150 int ret = 0, pos = 0;
152 for_each_cpu(i, hctx->cpumask) {
154 ret = snprintf(pos + page, size - pos, "%u", i);
156 ret = snprintf(pos + page, size - pos, ", %u", i);
158 if (ret >= size - pos)
165 ret = snprintf(pos + page, size + 1 - pos, "\n");
169 static struct attribute *default_ctx_attrs[] = {
173 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
174 .attr = {.name = "nr_tags", .mode = S_IRUGO },
175 .show = blk_mq_hw_sysfs_nr_tags_show,
177 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
178 .attr = {.name = "nr_reserved_tags", .mode = S_IRUGO },
179 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
181 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
182 .attr = {.name = "cpu_list", .mode = S_IRUGO },
183 .show = blk_mq_hw_sysfs_cpus_show,
186 static struct attribute *default_hw_ctx_attrs[] = {
187 &blk_mq_hw_sysfs_nr_tags.attr,
188 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
189 &blk_mq_hw_sysfs_cpus.attr,
193 static const struct sysfs_ops blk_mq_sysfs_ops = {
194 .show = blk_mq_sysfs_show,
195 .store = blk_mq_sysfs_store,
198 static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
199 .show = blk_mq_hw_sysfs_show,
200 .store = blk_mq_hw_sysfs_store,
203 static struct kobj_type blk_mq_ktype = {
204 .sysfs_ops = &blk_mq_sysfs_ops,
205 .release = blk_mq_sysfs_release,
208 static struct kobj_type blk_mq_ctx_ktype = {
209 .sysfs_ops = &blk_mq_sysfs_ops,
210 .default_attrs = default_ctx_attrs,
211 .release = blk_mq_sysfs_release,
214 static struct kobj_type blk_mq_hw_ktype = {
215 .sysfs_ops = &blk_mq_hw_sysfs_ops,
216 .default_attrs = default_hw_ctx_attrs,
217 .release = blk_mq_hw_sysfs_release,
220 static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
222 struct blk_mq_ctx *ctx;
228 hctx_for_each_ctx(hctx, ctx, i)
229 kobject_del(&ctx->kobj);
231 kobject_del(&hctx->kobj);
234 static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
236 struct request_queue *q = hctx->queue;
237 struct blk_mq_ctx *ctx;
243 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
247 hctx_for_each_ctx(hctx, ctx, i) {
248 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
255 hctx_for_each_ctx(hctx, ctx, j) {
257 kobject_del(&ctx->kobj);
259 kobject_del(&hctx->kobj);
263 static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
265 struct blk_mq_hw_ctx *hctx;
268 lockdep_assert_held(&q->sysfs_lock);
270 queue_for_each_hw_ctx(q, hctx, i)
271 blk_mq_unregister_hctx(hctx);
273 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
274 kobject_del(&q->mq_kobj);
275 kobject_put(&dev->kobj);
277 q->mq_sysfs_init_done = false;
280 void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
282 mutex_lock(&q->sysfs_lock);
283 __blk_mq_unregister_dev(dev, q);
284 mutex_unlock(&q->sysfs_lock);
287 void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
289 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
292 void blk_mq_sysfs_deinit(struct request_queue *q)
294 struct blk_mq_ctx *ctx;
297 for_each_possible_cpu(cpu) {
298 ctx = per_cpu_ptr(q->queue_ctx, cpu);
299 kobject_put(&ctx->kobj);
301 kobject_put(&q->mq_kobj);
304 void blk_mq_sysfs_init(struct request_queue *q)
306 struct blk_mq_ctx *ctx;
309 kobject_init(&q->mq_kobj, &blk_mq_ktype);
311 for_each_possible_cpu(cpu) {
312 ctx = per_cpu_ptr(q->queue_ctx, cpu);
313 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
317 int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
319 struct blk_mq_hw_ctx *hctx;
322 WARN_ON_ONCE(!q->kobj.parent);
323 lockdep_assert_held(&q->sysfs_lock);
325 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
329 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
331 queue_for_each_hw_ctx(q, hctx, i) {
332 ret = blk_mq_register_hctx(hctx);
337 q->mq_sysfs_init_done = true;
344 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
346 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
347 kobject_del(&q->mq_kobj);
348 kobject_put(&dev->kobj);
352 int blk_mq_register_dev(struct device *dev, struct request_queue *q)
356 mutex_lock(&q->sysfs_lock);
357 ret = __blk_mq_register_dev(dev, q);
358 mutex_unlock(&q->sysfs_lock);
362 EXPORT_SYMBOL_GPL(blk_mq_register_dev);
364 void blk_mq_sysfs_unregister(struct request_queue *q)
366 struct blk_mq_hw_ctx *hctx;
369 mutex_lock(&q->sysfs_lock);
370 if (!q->mq_sysfs_init_done)
373 queue_for_each_hw_ctx(q, hctx, i)
374 blk_mq_unregister_hctx(hctx);
377 mutex_unlock(&q->sysfs_lock);
380 int blk_mq_sysfs_register(struct request_queue *q)
382 struct blk_mq_hw_ctx *hctx;
385 mutex_lock(&q->sysfs_lock);
386 if (!q->mq_sysfs_init_done)
389 queue_for_each_hw_ctx(q, hctx, i) {
390 ret = blk_mq_register_hctx(hctx);
396 mutex_unlock(&q->sysfs_lock);