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 unsigned int i, first = 1;
151 for_each_cpu(i, hctx->cpumask) {
153 ret += sprintf(ret + page, "%u", i);
155 ret += sprintf(ret + page, ", %u", i);
160 ret += sprintf(ret + page, "\n");
164 static struct attribute *default_ctx_attrs[] = {
168 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
169 .attr = {.name = "nr_tags", .mode = S_IRUGO },
170 .show = blk_mq_hw_sysfs_nr_tags_show,
172 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
173 .attr = {.name = "nr_reserved_tags", .mode = S_IRUGO },
174 .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
176 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
177 .attr = {.name = "cpu_list", .mode = S_IRUGO },
178 .show = blk_mq_hw_sysfs_cpus_show,
181 static struct attribute *default_hw_ctx_attrs[] = {
182 &blk_mq_hw_sysfs_nr_tags.attr,
183 &blk_mq_hw_sysfs_nr_reserved_tags.attr,
184 &blk_mq_hw_sysfs_cpus.attr,
188 static const struct sysfs_ops blk_mq_sysfs_ops = {
189 .show = blk_mq_sysfs_show,
190 .store = blk_mq_sysfs_store,
193 static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
194 .show = blk_mq_hw_sysfs_show,
195 .store = blk_mq_hw_sysfs_store,
198 static struct kobj_type blk_mq_ktype = {
199 .sysfs_ops = &blk_mq_sysfs_ops,
200 .release = blk_mq_sysfs_release,
203 static struct kobj_type blk_mq_ctx_ktype = {
204 .sysfs_ops = &blk_mq_sysfs_ops,
205 .default_attrs = default_ctx_attrs,
206 .release = blk_mq_sysfs_release,
209 static struct kobj_type blk_mq_hw_ktype = {
210 .sysfs_ops = &blk_mq_hw_sysfs_ops,
211 .default_attrs = default_hw_ctx_attrs,
212 .release = blk_mq_hw_sysfs_release,
215 static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
217 struct blk_mq_ctx *ctx;
223 hctx_for_each_ctx(hctx, ctx, i)
224 kobject_del(&ctx->kobj);
226 kobject_del(&hctx->kobj);
229 static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
231 struct request_queue *q = hctx->queue;
232 struct blk_mq_ctx *ctx;
238 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
242 hctx_for_each_ctx(hctx, ctx, i) {
243 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
251 static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
253 struct blk_mq_hw_ctx *hctx;
256 lockdep_assert_held(&q->sysfs_lock);
258 queue_for_each_hw_ctx(q, hctx, i)
259 blk_mq_unregister_hctx(hctx);
261 blk_mq_debugfs_unregister_mq(q);
263 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
264 kobject_del(&q->mq_kobj);
265 kobject_put(&dev->kobj);
267 q->mq_sysfs_init_done = false;
270 void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
272 mutex_lock(&q->sysfs_lock);
273 __blk_mq_unregister_dev(dev, q);
274 mutex_unlock(&q->sysfs_lock);
277 void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
279 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
282 void blk_mq_sysfs_deinit(struct request_queue *q)
284 struct blk_mq_ctx *ctx;
287 for_each_possible_cpu(cpu) {
288 ctx = per_cpu_ptr(q->queue_ctx, cpu);
289 kobject_put(&ctx->kobj);
291 kobject_put(&q->mq_kobj);
294 void blk_mq_sysfs_init(struct request_queue *q)
296 struct blk_mq_ctx *ctx;
299 kobject_init(&q->mq_kobj, &blk_mq_ktype);
301 for_each_possible_cpu(cpu) {
302 ctx = per_cpu_ptr(q->queue_ctx, cpu);
303 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
307 int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
309 struct blk_mq_hw_ctx *hctx;
312 WARN_ON_ONCE(!q->kobj.parent);
313 lockdep_assert_held(&q->sysfs_lock);
315 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
319 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
321 blk_mq_debugfs_register(q);
323 queue_for_each_hw_ctx(q, hctx, i) {
324 ret = blk_mq_register_hctx(hctx);
329 q->mq_sysfs_init_done = true;
336 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
338 blk_mq_debugfs_unregister_mq(q);
340 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
341 kobject_del(&q->mq_kobj);
342 kobject_put(&dev->kobj);
346 int blk_mq_register_dev(struct device *dev, struct request_queue *q)
350 mutex_lock(&q->sysfs_lock);
351 ret = __blk_mq_register_dev(dev, q);
352 mutex_unlock(&q->sysfs_lock);
356 EXPORT_SYMBOL_GPL(blk_mq_register_dev);
358 void blk_mq_sysfs_unregister(struct request_queue *q)
360 struct blk_mq_hw_ctx *hctx;
363 mutex_lock(&q->sysfs_lock);
364 if (!q->mq_sysfs_init_done)
367 blk_mq_debugfs_unregister_mq(q);
369 queue_for_each_hw_ctx(q, hctx, i)
370 blk_mq_unregister_hctx(hctx);
373 mutex_unlock(&q->sysfs_lock);
376 int blk_mq_sysfs_register(struct request_queue *q)
378 struct blk_mq_hw_ctx *hctx;
381 mutex_lock(&q->sysfs_lock);
382 if (!q->mq_sysfs_init_done)
385 blk_mq_debugfs_register_mq(q);
387 queue_for_each_hw_ctx(q, hctx, i) {
388 ret = blk_mq_register_hctx(hctx);
394 mutex_unlock(&q->sysfs_lock);