[linux-2.6-block.git] / block / blk-mq-sysfs.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/smp.h>

#include <linux/blk-mq.h>
#include "blk.h"
#include "blk-mq.h"
#include "blk-mq-tag.h"

static void blk_mq_sysfs_release(struct kobject *kobj)
{
	struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);

	free_percpu(ctxs->queue_ctx);
	kfree(ctxs);
}

static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
{
	struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);

	/* ctx->ctxs won't be released until all ctx are freed */
	kobject_put(&ctx->ctxs->kobj);
}

static void blk_mq_hw_sysfs_release(struct kobject *kobj)
{
	struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
						  kobj);

	cancel_delayed_work_sync(&hctx->run_work);

	if (hctx->flags & BLK_MQ_F_BLOCKING)
		cleanup_srcu_struct(hctx->srcu);
	blk_free_flush_queue(hctx->fq);
	sbitmap_free(&hctx->ctx_map);
	free_cpumask_var(hctx->cpumask);
	kfree(hctx->ctxs);
	kfree(hctx);
}

struct blk_mq_ctx_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(struct blk_mq_ctx *, char *);
	ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
};

struct blk_mq_hw_ctx_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
	ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
};

static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
				 char *page)
{
	struct blk_mq_ctx_sysfs_entry *entry;
	struct blk_mq_ctx *ctx;
	struct request_queue *q;
	ssize_t res;

	entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
	ctx = container_of(kobj, struct blk_mq_ctx, kobj);
	q = ctx->queue;

	if (!entry->show)
		return -EIO;

	mutex_lock(&q->sysfs_lock);
	res = entry->show(ctx, page);
	mutex_unlock(&q->sysfs_lock);
	return res;
}

static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
				  const char *page, size_t length)
{
	struct blk_mq_ctx_sysfs_entry *entry;
	struct blk_mq_ctx *ctx;
	struct request_queue *q;
	ssize_t res;

	entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
	ctx = container_of(kobj, struct blk_mq_ctx, kobj);
	q = ctx->queue;

	if (!entry->store)
		return -EIO;

	mutex_lock(&q->sysfs_lock);
	res = entry->store(ctx, page, length);
	mutex_unlock(&q->sysfs_lock);
	return res;
}

static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
				    struct attribute *attr, char *page)
{
	struct blk_mq_hw_ctx_sysfs_entry *entry;
	struct blk_mq_hw_ctx *hctx;
	struct request_queue *q;
	ssize_t res;

	entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
	hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
	q = hctx->queue;

	if (!entry->show)
		return -EIO;

	mutex_lock(&q->sysfs_lock);
	res = entry->show(hctx, page);
	mutex_unlock(&q->sysfs_lock);
	return res;
}

static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
				     struct attribute *attr, const char *page,
				     size_t length)
{
	struct blk_mq_hw_ctx_sysfs_entry *entry;
	struct blk_mq_hw_ctx *hctx;
	struct request_queue *q;
	ssize_t res;

	entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
	hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
	q = hctx->queue;

	if (!entry->store)
		return -EIO;

	mutex_lock(&q->sysfs_lock);
	res = entry->store(hctx, page, length);
	mutex_unlock(&q->sysfs_lock);
	return res;
}

static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
					    char *page)
{
	return sprintf(page, "%u\n", hctx->tags->nr_tags);
}

static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
						     char *page)
{
	return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
}

static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
{
	unsigned int i, first = 1;
	ssize_t ret = 0;

	for_each_cpu(i, hctx->cpumask) {
		if (first)
			ret += sprintf(ret + page, "%u", i);
		else
			ret += sprintf(ret + page, ", %u", i);

		first = 0;
	}

	ret += sprintf(ret + page, "\n");
	return ret;
}

static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
	.attr = {.name = "nr_tags", .mode = 0444 },
	.show = blk_mq_hw_sysfs_nr_tags_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
	.attr = {.name = "nr_reserved_tags", .mode = 0444 },
	.show = blk_mq_hw_sysfs_nr_reserved_tags_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
	.attr = {.name = "cpu_list", .mode = 0444 },
	.show = blk_mq_hw_sysfs_cpus_show,
};

static struct attribute *default_hw_ctx_attrs[] = {
	&blk_mq_hw_sysfs_nr_tags.attr,
	&blk_mq_hw_sysfs_nr_reserved_tags.attr,
	&blk_mq_hw_sysfs_cpus.attr,
	NULL,
};
ATTRIBUTE_GROUPS(default_hw_ctx);

static const struct sysfs_ops blk_mq_sysfs_ops = {
	.show	= blk_mq_sysfs_show,
	.store	= blk_mq_sysfs_store,
};

static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
	.show	= blk_mq_hw_sysfs_show,
	.store	= blk_mq_hw_sysfs_store,
};

static struct kobj_type blk_mq_ktype = {
	.sysfs_ops	= &blk_mq_sysfs_ops,
	.release	= blk_mq_sysfs_release,
};

static struct kobj_type blk_mq_ctx_ktype = {
	.sysfs_ops	= &blk_mq_sysfs_ops,
	.release	= blk_mq_ctx_sysfs_release,
};

static struct kobj_type blk_mq_hw_ktype = {
	.sysfs_ops	= &blk_mq_hw_sysfs_ops,
	.default_groups = default_hw_ctx_groups,
	.release	= blk_mq_hw_sysfs_release,
};

static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
{
	struct blk_mq_ctx *ctx;
	int i;

	if (!hctx->nr_ctx)
		return;

	hctx_for_each_ctx(hctx, ctx, i)
		kobject_del(&ctx->kobj);

	kobject_del(&hctx->kobj);
}

static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
{
	struct request_queue *q = hctx->queue;
	struct blk_mq_ctx *ctx;
	int i, ret;

	if (!hctx->nr_ctx)
		return 0;

	ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
	if (ret)
		return ret;

	hctx_for_each_ctx(hctx, ctx, i) {
		ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
		if (ret)
			break;
	}

	return ret;
}

void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
{
	struct blk_mq_hw_ctx *hctx;
	int i;

	lockdep_assert_held(&q->sysfs_dir_lock);

	queue_for_each_hw_ctx(q, hctx, i)
		blk_mq_unregister_hctx(hctx);

	kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
	kobject_del(q->mq_kobj);
	kobject_put(&dev->kobj);

	q->mq_sysfs_init_done = false;
}

void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
{
	kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
}

void blk_mq_sysfs_deinit(struct request_queue *q)
{
	struct blk_mq_ctx *ctx;
	int cpu;

	for_each_possible_cpu(cpu) {
		ctx = per_cpu_ptr(q->queue_ctx, cpu);
		kobject_put(&ctx->kobj);
	}
	kobject_put(q->mq_kobj);
}

void blk_mq_sysfs_init(struct request_queue *q)
{
	struct blk_mq_ctx *ctx;
	int cpu;

	kobject_init(q->mq_kobj, &blk_mq_ktype);

	for_each_possible_cpu(cpu) {
		ctx = per_cpu_ptr(q->queue_ctx, cpu);

		kobject_get(q->mq_kobj);
		kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
	}
}

int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
{
	struct blk_mq_hw_ctx *hctx;
	int ret, i;

	WARN_ON_ONCE(!q->kobj.parent);
	lockdep_assert_held(&q->sysfs_dir_lock);

	ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
	if (ret < 0)
		goto out;

	kobject_uevent(q->mq_kobj, KOBJ_ADD);

	queue_for_each_hw_ctx(q, hctx, i) {
		ret = blk_mq_register_hctx(hctx);
		if (ret)
			goto unreg;
	}

	q->mq_sysfs_init_done = true;

out:
	return ret;

unreg:
	while (--i >= 0)
		blk_mq_unregister_hctx(q->queue_hw_ctx[i]);

	kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
	kobject_del(q->mq_kobj);
	kobject_put(&dev->kobj);
	return ret;
}

void blk_mq_sysfs_unregister(struct request_queue *q)
{
	struct blk_mq_hw_ctx *hctx;
	int i;

	mutex_lock(&q->sysfs_dir_lock);
	if (!q->mq_sysfs_init_done)
		goto unlock;

	queue_for_each_hw_ctx(q, hctx, i)
		blk_mq_unregister_hctx(hctx);

unlock:
	mutex_unlock(&q->sysfs_dir_lock);
}

int blk_mq_sysfs_register(struct request_queue *q)
{
	struct blk_mq_hw_ctx *hctx;
	int i, ret = 0;

	mutex_lock(&q->sysfs_dir_lock);
	if (!q->mq_sysfs_init_done)
		goto unlock;

	queue_for_each_hw_ctx(q, hctx, i) {
		ret = blk_mq_register_hctx(hctx);
		if (ret)
			break;
	}

unlock:
	mutex_unlock(&q->sysfs_dir_lock);

	return ret;
}
Commit	Line	Data
3dcf60bc	1	// SPDX-License-Identifier: GPL-2.0
320ae51f JA	2	#include <linux/kernel.h>
	3	#include <linux/module.h>
	4	#include <linux/backing-dev.h>
	5	#include <linux/bio.h>
	6	#include <linux/blkdev.h>
	7	#include <linux/mm.h>
	8	#include <linux/init.h>
	9	#include <linux/slab.h>
	10	#include <linux/workqueue.h>
	11	#include <linux/smp.h>
	12
	13	#include <linux/blk-mq.h>
c7e2d94b	14	#include "blk.h"
320ae51f JA	15	#include "blk-mq.h"
	16	#include "blk-mq-tag.h"
	17
	18	static void blk_mq_sysfs_release(struct kobject *kobj)
	19	{
1db4909e ML	20	struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);
	21
	22	free_percpu(ctxs->queue_ctx);
	23	kfree(ctxs);
	24	}
	25
	26	static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
	27	{
	28	struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);
	29
	30	/* ctx->ctxs won't be released until all ctx are freed */
	31	kobject_put(&ctx->ctxs->kobj);
320ae51f JA	32	}
320ae51f JA	33
6c8b232e ML	34	static void blk_mq_hw_sysfs_release(struct kobject *kobj)
	35	{
	36	struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
	37	kobj);
c7e2d94b	38
1b97871b ML	39	cancel_delayed_work_sync(&hctx->run_work);
1b97871b ML	40
c7e2d94b ML	41	if (hctx->flags & BLK_MQ_F_BLOCKING)
	42	cleanup_srcu_struct(hctx->srcu);
	43	blk_free_flush_queue(hctx->fq);
	44	sbitmap_free(&hctx->ctx_map);
01388df3	45	free_cpumask_var(hctx->cpumask);
6c8b232e ML	46	kfree(hctx->ctxs);
	47	kfree(hctx);
	48	}
	49
320ae51f JA	50	struct blk_mq_ctx_sysfs_entry {
	51	struct attribute attr;
	52	ssize_t (show)(struct blk_mq_ctx , char *);
	53	ssize_t (store)(struct blk_mq_ctx , const char *, size_t);
	54	};
	55
	56	struct blk_mq_hw_ctx_sysfs_entry {
	57	struct attribute attr;
	58	ssize_t (show)(struct blk_mq_hw_ctx , char *);
	59	ssize_t (store)(struct blk_mq_hw_ctx , const char *, size_t);
	60	};
	61
	62	static ssize_t blk_mq_sysfs_show(struct kobject kobj, struct attribute attr,
	63	char *page)
	64	{
	65	struct blk_mq_ctx_sysfs_entry *entry;
	66	struct blk_mq_ctx *ctx;
	67	struct request_queue *q;
	68	ssize_t res;
	69
	70	entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
	71	ctx = container_of(kobj, struct blk_mq_ctx, kobj);
	72	q = ctx->queue;
	73
	74	if (!entry->show)
	75	return -EIO;
	76
320ae51f	77	mutex_lock(&q->sysfs_lock);
bae85c15	78	res = entry->show(ctx, page);
320ae51f JA	79	mutex_unlock(&q->sysfs_lock);
	80	return res;
	81	}
	82
	83	static ssize_t blk_mq_sysfs_store(struct kobject kobj, struct attribute attr,
	84	const char *page, size_t length)
	85	{
	86	struct blk_mq_ctx_sysfs_entry *entry;
	87	struct blk_mq_ctx *ctx;
	88	struct request_queue *q;
	89	ssize_t res;
	90
	91	entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
	92	ctx = container_of(kobj, struct blk_mq_ctx, kobj);
	93	q = ctx->queue;
	94
	95	if (!entry->store)
	96	return -EIO;
	97
320ae51f	98	mutex_lock(&q->sysfs_lock);
bae85c15	99	res = entry->store(ctx, page, length);
320ae51f JA	100	mutex_unlock(&q->sysfs_lock);
	101	return res;
	102	}
	103
	104	static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
	105	struct attribute attr, char page)
	106	{
	107	struct blk_mq_hw_ctx_sysfs_entry *entry;
	108	struct blk_mq_hw_ctx *hctx;
	109	struct request_queue *q;
	110	ssize_t res;
	111
	112	entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
	113	hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
	114	q = hctx->queue;
	115
	116	if (!entry->show)
	117	return -EIO;
	118
320ae51f	119	mutex_lock(&q->sysfs_lock);
bae85c15	120	res = entry->show(hctx, page);
320ae51f JA	121	mutex_unlock(&q->sysfs_lock);
	122	return res;
	123	}
	124
	125	static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
	126	struct attribute attr, const char page,
	127	size_t length)
	128	{
	129	struct blk_mq_hw_ctx_sysfs_entry *entry;
	130	struct blk_mq_hw_ctx *hctx;
	131	struct request_queue *q;
	132	ssize_t res;
	133
	134	entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
	135	hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
	136	q = hctx->queue;
	137
	138	if (!entry->store)
	139	return -EIO;
	140
320ae51f	141	mutex_lock(&q->sysfs_lock);
bae85c15	142	res = entry->store(hctx, page, length);
320ae51f JA	143	mutex_unlock(&q->sysfs_lock);
	144	return res;
	145	}
	146
d96b37c0 OS	147	static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
d96b37c0 OS	148	char *page)
bd166ef1	149	{
d96b37c0	150	return sprintf(page, "%u\n", hctx->tags->nr_tags);
bd166ef1 JA	151	}
bd166ef1 JA	152
d96b37c0 OS	153	static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
d96b37c0 OS	154	char *page)
320ae51f	155	{
d96b37c0	156	return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
320ae51f JA	157	}
320ae51f JA	158
676141e4 JA	159	static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx hctx, char page)
676141e4 JA	160	{
cb2da43e	161	unsigned int i, first = 1;
676141e4 JA	162	ssize_t ret = 0;
676141e4 JA	163
cb2da43e	164	for_each_cpu(i, hctx->cpumask) {
676141e4 JA	165	if (first)
	166	ret += sprintf(ret + page, "%u", i);
	167	else
	168	ret += sprintf(ret + page, ", %u", i);
	169
	170	first = 0;
	171	}
	172
676141e4 JA	173	ret += sprintf(ret + page, "\n");
	174	return ret;
	175	}
	176
d96b37c0	177	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
5657a819	178	.attr = {.name = "nr_tags", .mode = 0444 },
d96b37c0 OS	179	.show = blk_mq_hw_sysfs_nr_tags_show,
	180	};
	181	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
5657a819	182	.attr = {.name = "nr_reserved_tags", .mode = 0444 },
d96b37c0 OS	183	.show = blk_mq_hw_sysfs_nr_reserved_tags_show,
d96b37c0 OS	184	};
676141e4	185	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
5657a819	186	.attr = {.name = "cpu_list", .mode = 0444 },
676141e4 JA	187	.show = blk_mq_hw_sysfs_cpus_show,
676141e4 JA	188	};
320ae51f JA	189
320ae51f JA	190	static struct attribute *default_hw_ctx_attrs[] = {
d96b37c0 OS	191	&blk_mq_hw_sysfs_nr_tags.attr,
d96b37c0 OS	192	&blk_mq_hw_sysfs_nr_reserved_tags.attr,
676141e4	193	&blk_mq_hw_sysfs_cpus.attr,
320ae51f JA	194	NULL,
320ae51f JA	195	};
800f5aa1	196	ATTRIBUTE_GROUPS(default_hw_ctx);
320ae51f JA	197
	198	static const struct sysfs_ops blk_mq_sysfs_ops = {
	199	.show = blk_mq_sysfs_show,
	200	.store = blk_mq_sysfs_store,
	201	};
	202
	203	static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
	204	.show = blk_mq_hw_sysfs_show,
	205	.store = blk_mq_hw_sysfs_store,
	206	};
	207
	208	static struct kobj_type blk_mq_ktype = {
	209	.sysfs_ops = &blk_mq_sysfs_ops,
	210	.release = blk_mq_sysfs_release,
	211	};
	212
	213	static struct kobj_type blk_mq_ctx_ktype = {
	214	.sysfs_ops = &blk_mq_sysfs_ops,
1db4909e	215	.release = blk_mq_ctx_sysfs_release,
320ae51f JA	216	};
	217
	218	static struct kobj_type blk_mq_hw_ktype = {
	219	.sysfs_ops = &blk_mq_hw_sysfs_ops,
800f5aa1	220	.default_groups = default_hw_ctx_groups,
6c8b232e	221	.release = blk_mq_hw_sysfs_release,
320ae51f JA	222	};
320ae51f JA	223
ee3c5db0	224	static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
67aec14c JA	225	{
	226	struct blk_mq_ctx *ctx;
	227	int i;
	228
4593fdbe	229	if (!hctx->nr_ctx)
67aec14c JA	230	return;
	231
	232	hctx_for_each_ctx(hctx, ctx, i)
	233	kobject_del(&ctx->kobj);
	234
	235	kobject_del(&hctx->kobj);
	236	}
	237
ee3c5db0	238	static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
67aec14c JA	239	{
	240	struct request_queue *q = hctx->queue;
	241	struct blk_mq_ctx *ctx;
	242	int i, ret;
	243
4593fdbe	244	if (!hctx->nr_ctx)
67aec14c JA	245	return 0;
67aec14c JA	246
1db4909e	247	ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
67aec14c JA	248	if (ret)
	249	return ret;
	250
	251	hctx_for_each_ctx(hctx, ctx, i) {
	252	ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
	253	if (ret)
	254	break;
	255	}
	256
	257	return ret;
	258	}
	259
667257e8	260	void blk_mq_unregister_dev(struct device dev, struct request_queue q)
320ae51f	261	{
85157366	262	struct blk_mq_hw_ctx *hctx;
7ea5fe31	263	int i;
85157366	264
cecf5d87	265	lockdep_assert_held(&q->sysfs_dir_lock);
2d0364c8	266
6c8b232e	267	queue_for_each_hw_ctx(q, hctx, i)
67aec14c JA	268	blk_mq_unregister_hctx(hctx);
67aec14c JA	269
1db4909e ML	270	kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
1db4909e ML	271	kobject_del(q->mq_kobj);
b21d5b30	272	kobject_put(&dev->kobj);
4593fdbe AM	273
4593fdbe AM	274	q->mq_sysfs_init_done = false;
c0f3fd2b JA	275	}
c0f3fd2b JA	276
868f2f0b KB	277	void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
	278	{
	279	kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
	280	}
	281
7ea5fe31 ML	282	void blk_mq_sysfs_deinit(struct request_queue *q)
	283	{
	284	struct blk_mq_ctx *ctx;
	285	int cpu;
	286
	287	for_each_possible_cpu(cpu) {
	288	ctx = per_cpu_ptr(q->queue_ctx, cpu);
	289	kobject_put(&ctx->kobj);
	290	}
1db4909e	291	kobject_put(q->mq_kobj);
7ea5fe31 ML	292	}
7ea5fe31 ML	293
737f98cf	294	void blk_mq_sysfs_init(struct request_queue *q)
67aec14c	295	{
67aec14c	296	struct blk_mq_ctx *ctx;
897bb0c7	297	int cpu;
67aec14c	298
1db4909e	299	kobject_init(q->mq_kobj, &blk_mq_ktype);
67aec14c	300
897bb0c7 TG	301	for_each_possible_cpu(cpu) {
897bb0c7 TG	302	ctx = per_cpu_ptr(q->queue_ctx, cpu);
1db4909e ML	303
1db4909e ML	304	kobject_get(q->mq_kobj);
06a41a99	305	kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
897bb0c7	306	}
67aec14c JA	307	}
67aec14c JA	308
2d0364c8	309	int __blk_mq_register_dev(struct device dev, struct request_queue q)
320ae51f	310	{
320ae51f	311	struct blk_mq_hw_ctx *hctx;
67aec14c	312	int ret, i;
320ae51f	313
2d0364c8	314	WARN_ON_ONCE(!q->kobj.parent);
cecf5d87	315	lockdep_assert_held(&q->sysfs_dir_lock);
4593fdbe	316
1db4909e	317	ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
320ae51f	318	if (ret < 0)
4593fdbe	319	goto out;
320ae51f	320
1db4909e	321	kobject_uevent(q->mq_kobj, KOBJ_ADD);
320ae51f JA	322
320ae51f JA	323	queue_for_each_hw_ctx(q, hctx, i) {
67aec14c	324	ret = blk_mq_register_hctx(hctx);
320ae51f	325	if (ret)
f05d1ba7	326	goto unreg;
320ae51f JA	327	}
320ae51f JA	328
f05d1ba7	329	q->mq_sysfs_init_done = true;
2d0364c8	330
4593fdbe	331	out:
2d0364c8	332	return ret;
f05d1ba7 BVA	333
	334	unreg:
	335	while (--i >= 0)
	336	blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
	337
1db4909e ML	338	kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
1db4909e ML	339	kobject_del(q->mq_kobj);
f05d1ba7 BVA	340	kobject_put(&dev->kobj);
f05d1ba7 BVA	341	return ret;
2d0364c8 BVA	342	}
2d0364c8 BVA	343
67aec14c JA	344	void blk_mq_sysfs_unregister(struct request_queue *q)
	345	{
	346	struct blk_mq_hw_ctx *hctx;
	347	int i;
	348
cecf5d87	349	mutex_lock(&q->sysfs_dir_lock);
4593fdbe	350	if (!q->mq_sysfs_init_done)
2d0364c8	351	goto unlock;
4593fdbe	352
67aec14c JA	353	queue_for_each_hw_ctx(q, hctx, i)
67aec14c JA	354	blk_mq_unregister_hctx(hctx);
2d0364c8 BVA	355
2d0364c8 BVA	356	unlock:
cecf5d87	357	mutex_unlock(&q->sysfs_dir_lock);
67aec14c JA	358	}
	359
	360	int blk_mq_sysfs_register(struct request_queue *q)
	361	{
	362	struct blk_mq_hw_ctx *hctx;
	363	int i, ret = 0;
	364
cecf5d87	365	mutex_lock(&q->sysfs_dir_lock);
4593fdbe	366	if (!q->mq_sysfs_init_done)
2d0364c8	367	goto unlock;
4593fdbe	368
67aec14c JA	369	queue_for_each_hw_ctx(q, hctx, i) {
	370	ret = blk_mq_register_hctx(hctx);
	371	if (ret)
	372	break;
	373	}
	374
2d0364c8	375	unlock:
cecf5d87	376	mutex_unlock(&q->sysfs_dir_lock);
2d0364c8	377
67aec14c JA	378	return ret;
67aec14c JA	379	}