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 struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
177 .attr = {.name = "nr_tags", .mode = 0444 },
178 .show = blk_mq_hw_sysfs_nr_tags_show,
180 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
181 .attr = {.name = "nr_reserved_tags", .mode = 0444 },
182 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
184 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
185 .attr = {.name = "cpu_list", .mode = 0444 },
186 .show = blk_mq_hw_sysfs_cpus_show,
189 static struct attribute *default_hw_ctx_attrs[] = {
190 &blk_mq_hw_sysfs_nr_tags.attr,
191 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
192 &blk_mq_hw_sysfs_cpus.attr,
195 ATTRIBUTE_GROUPS(default_hw_ctx);
197 static const struct sysfs_ops blk_mq_sysfs_ops = {
198 .show = blk_mq_sysfs_show,
199 .store = blk_mq_sysfs_store,
202 static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
203 .show = blk_mq_hw_sysfs_show,
204 .store = blk_mq_hw_sysfs_store,
207 static struct kobj_type blk_mq_ktype = {
208 .sysfs_ops = &blk_mq_sysfs_ops,
209 .release = blk_mq_sysfs_release,
212 static struct kobj_type blk_mq_ctx_ktype = {
213 .sysfs_ops = &blk_mq_sysfs_ops,
214 .release = blk_mq_ctx_sysfs_release,
217 static struct kobj_type blk_mq_hw_ktype = {
218 .sysfs_ops = &blk_mq_hw_sysfs_ops,
219 .default_groups = default_hw_ctx_groups,
220 .release = blk_mq_hw_sysfs_release,
223 static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
225 struct blk_mq_ctx *ctx;
231 hctx_for_each_ctx(hctx, ctx, i)
232 kobject_del(&ctx->kobj);
234 kobject_del(&hctx->kobj);
237 static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
239 struct request_queue *q = hctx->queue;
240 struct blk_mq_ctx *ctx;
246 ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
250 hctx_for_each_ctx(hctx, ctx, i) {
251 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
259 void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
261 struct blk_mq_hw_ctx *hctx;
264 lockdep_assert_held(&q->sysfs_lock);
266 queue_for_each_hw_ctx(q, hctx, i)
267 blk_mq_unregister_hctx(hctx);
269 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
270 kobject_del(q->mq_kobj);
271 kobject_put(&dev->kobj);
273 q->mq_sysfs_init_done = false;
276 void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
278 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
281 void blk_mq_sysfs_deinit(struct request_queue *q)
283 struct blk_mq_ctx *ctx;
286 for_each_possible_cpu(cpu) {
287 ctx = per_cpu_ptr(q->queue_ctx, cpu);
288 kobject_put(&ctx->kobj);
290 kobject_put(q->mq_kobj);
293 void blk_mq_sysfs_init(struct request_queue *q)
295 struct blk_mq_ctx *ctx;
298 kobject_init(q->mq_kobj, &blk_mq_ktype);
300 for_each_possible_cpu(cpu) {
301 ctx = per_cpu_ptr(q->queue_ctx, cpu);
303 kobject_get(q->mq_kobj);
304 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
308 int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
310 struct blk_mq_hw_ctx *hctx;
313 WARN_ON_ONCE(!q->kobj.parent);
314 lockdep_assert_held(&q->sysfs_lock);
316 ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
320 kobject_uevent(q->mq_kobj, KOBJ_ADD);
322 queue_for_each_hw_ctx(q, hctx, i) {
323 ret = blk_mq_register_hctx(hctx);
328 q->mq_sysfs_init_done = true;
335 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
337 kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
338 kobject_del(q->mq_kobj);
339 kobject_put(&dev->kobj);
343 int blk_mq_register_dev(struct device *dev, struct request_queue *q)
347 mutex_lock(&q->sysfs_lock);
348 ret = __blk_mq_register_dev(dev, q);
349 mutex_unlock(&q->sysfs_lock);
354 void blk_mq_sysfs_unregister(struct request_queue *q)
356 struct blk_mq_hw_ctx *hctx;
359 mutex_lock(&q->sysfs_lock);
360 if (!q->mq_sysfs_init_done)
363 queue_for_each_hw_ctx(q, hctx, i)
364 blk_mq_unregister_hctx(hctx);
367 mutex_unlock(&q->sysfs_lock);
370 int blk_mq_sysfs_register(struct request_queue *q)
372 struct blk_mq_hw_ctx *hctx;
375 mutex_lock(&q->sysfs_lock);
376 if (!q->mq_sysfs_init_done)
379 queue_for_each_hw_ctx(q, hctx, i) {
380 ret = blk_mq_register_hctx(hctx);
386 mutex_unlock(&q->sysfs_lock);