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)
18 struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);
20 free_percpu(ctxs->queue_ctx);
24 static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
26 struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);
28 /* ctx->ctxs won't be released until all ctx are freed */
29 kobject_put(&ctx->ctxs->kobj);
32 static void blk_mq_hw_sysfs_release(struct kobject *kobj)
34 struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
36 free_cpumask_var(hctx->cpumask);
41 struct blk_mq_ctx_sysfs_entry {
42 struct attribute attr;
43 ssize_t (*show)(struct blk_mq_ctx *, char *);
44 ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
47 struct blk_mq_hw_ctx_sysfs_entry {
48 struct attribute attr;
49 ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
50 ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
53 static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
56 struct blk_mq_ctx_sysfs_entry *entry;
57 struct blk_mq_ctx *ctx;
58 struct request_queue *q;
61 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
62 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
69 mutex_lock(&q->sysfs_lock);
70 if (!blk_queue_dying(q))
71 res = entry->show(ctx, page);
72 mutex_unlock(&q->sysfs_lock);
76 static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
77 const char *page, size_t length)
79 struct blk_mq_ctx_sysfs_entry *entry;
80 struct blk_mq_ctx *ctx;
81 struct request_queue *q;
84 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
85 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
92 mutex_lock(&q->sysfs_lock);
93 if (!blk_queue_dying(q))
94 res = entry->store(ctx, page, length);
95 mutex_unlock(&q->sysfs_lock);
99 static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
100 struct attribute *attr, char *page)
102 struct blk_mq_hw_ctx_sysfs_entry *entry;
103 struct blk_mq_hw_ctx *hctx;
104 struct request_queue *q;
107 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
108 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
115 mutex_lock(&q->sysfs_lock);
116 if (!blk_queue_dying(q))
117 res = entry->show(hctx, page);
118 mutex_unlock(&q->sysfs_lock);
122 static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
123 struct attribute *attr, const char *page,
126 struct blk_mq_hw_ctx_sysfs_entry *entry;
127 struct blk_mq_hw_ctx *hctx;
128 struct request_queue *q;
131 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
132 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
139 mutex_lock(&q->sysfs_lock);
140 if (!blk_queue_dying(q))
141 res = entry->store(hctx, page, length);
142 mutex_unlock(&q->sysfs_lock);
146 static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
149 return sprintf(page, "%u\n", hctx->tags->nr_tags);
152 static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
155 return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
158 static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
160 unsigned int i, first = 1;
163 for_each_cpu(i, hctx->cpumask) {
165 ret += sprintf(ret + page, "%u", i);
167 ret += sprintf(ret + page, ", %u", i);
172 ret += sprintf(ret + page, "\n");
176 static const char *const hctx_types[] = {
177 [HCTX_TYPE_DEFAULT] = "default",
178 [HCTX_TYPE_READ] = "read",
179 [HCTX_TYPE_POLL] = "poll",
182 static ssize_t blk_mq_hw_sysfs_type_show(struct blk_mq_hw_ctx *hctx, char *page)
184 BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
185 return sprintf(page, "%s\n", hctx_types[hctx->type]);
188 static struct attribute *default_ctx_attrs[] = {
192 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
193 .attr = {.name = "nr_tags", .mode = 0444 },
194 .show = blk_mq_hw_sysfs_nr_tags_show,
196 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
197 .attr = {.name = "nr_reserved_tags", .mode = 0444 },
198 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
200 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
201 .attr = {.name = "cpu_list", .mode = 0444 },
202 .show = blk_mq_hw_sysfs_cpus_show,
204 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_type = {
205 .attr = {.name = "type", .mode = 0444 },
206 .show = blk_mq_hw_sysfs_type_show,
209 static struct attribute *default_hw_ctx_attrs[] = {
210 &blk_mq_hw_sysfs_nr_tags.attr,
211 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
212 &blk_mq_hw_sysfs_cpus.attr,
213 &blk_mq_hw_sysfs_type.attr,
217 static const struct sysfs_ops blk_mq_sysfs_ops = {
218 .show = blk_mq_sysfs_show,
219 .store = blk_mq_sysfs_store,
222 static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
223 .show = blk_mq_hw_sysfs_show,
224 .store = blk_mq_hw_sysfs_store,
227 static struct kobj_type blk_mq_ktype = {
228 .sysfs_ops = &blk_mq_sysfs_ops,
229 .release = blk_mq_sysfs_release,
232 static struct kobj_type blk_mq_ctx_ktype = {
233 .sysfs_ops = &blk_mq_sysfs_ops,
234 .default_attrs = default_ctx_attrs,
235 .release = blk_mq_ctx_sysfs_release,
238 static struct kobj_type blk_mq_hw_ktype = {
239 .sysfs_ops = &blk_mq_hw_sysfs_ops,
240 .default_attrs = default_hw_ctx_attrs,
241 .release = blk_mq_hw_sysfs_release,
244 static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
246 struct blk_mq_ctx *ctx;
252 hctx_for_each_ctx(hctx, ctx, i)
253 kobject_del(&ctx->kobj);
255 kobject_del(&hctx->kobj);
258 static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
260 struct request_queue *q = hctx->queue;
261 struct blk_mq_ctx *ctx;
267 ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
271 hctx_for_each_ctx(hctx, ctx, i) {
272 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
280 void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
282 struct blk_mq_hw_ctx *hctx;
285 lockdep_assert_held(&q->sysfs_lock);
287 queue_for_each_hw_ctx(q, hctx, i)
288 blk_mq_unregister_hctx(hctx);
290 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
291 kobject_del(q->mq_kobj);
292 kobject_put(&dev->kobj);
294 q->mq_sysfs_init_done = false;
297 void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
299 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
302 void blk_mq_sysfs_deinit(struct request_queue *q)
304 struct blk_mq_ctx *ctx;
307 for_each_possible_cpu(cpu) {
308 ctx = per_cpu_ptr(q->queue_ctx, cpu);
309 kobject_put(&ctx->kobj);
311 kobject_put(q->mq_kobj);
314 void blk_mq_sysfs_init(struct request_queue *q)
316 struct blk_mq_ctx *ctx;
319 kobject_init(q->mq_kobj, &blk_mq_ktype);
321 for_each_possible_cpu(cpu) {
322 ctx = per_cpu_ptr(q->queue_ctx, cpu);
324 kobject_get(q->mq_kobj);
325 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
329 int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
331 struct blk_mq_hw_ctx *hctx;
334 WARN_ON_ONCE(!q->kobj.parent);
335 lockdep_assert_held(&q->sysfs_lock);
337 ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
341 kobject_uevent(q->mq_kobj, KOBJ_ADD);
343 queue_for_each_hw_ctx(q, hctx, i) {
344 ret = blk_mq_register_hctx(hctx);
349 q->mq_sysfs_init_done = true;
356 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
358 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
359 kobject_del(q->mq_kobj);
360 kobject_put(&dev->kobj);
364 int blk_mq_register_dev(struct device *dev, struct request_queue *q)
368 mutex_lock(&q->sysfs_lock);
369 ret = __blk_mq_register_dev(dev, q);
370 mutex_unlock(&q->sysfs_lock);
375 void blk_mq_sysfs_unregister(struct request_queue *q)
377 struct blk_mq_hw_ctx *hctx;
380 mutex_lock(&q->sysfs_lock);
381 if (!q->mq_sysfs_init_done)
384 queue_for_each_hw_ctx(q, hctx, i)
385 blk_mq_unregister_hctx(hctx);
388 mutex_unlock(&q->sysfs_lock);
391 int blk_mq_sysfs_register(struct request_queue *q)
393 struct blk_mq_hw_ctx *hctx;
396 mutex_lock(&q->sysfs_lock);
397 if (!q->mq_sysfs_init_done)
400 queue_for_each_hw_ctx(q, hctx, i) {
401 ret = blk_mq_register_hctx(hctx);
407 mutex_unlock(&q->sysfs_lock);