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

#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-mq.h"
#include "blk-mq-tag.h"

static void blk_mq_sysfs_release(struct kobject *kobj)
{
}

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;

	res = -ENOENT;
	mutex_lock(&q->sysfs_lock);
	if (!blk_queue_dying(q))
		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;

	res = -ENOENT;
	mutex_lock(&q->sysfs_lock);
	if (!blk_queue_dying(q))
		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;

	res = -ENOENT;
	mutex_lock(&q->sysfs_lock);
	if (!blk_queue_dying(q))
		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;

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

static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page)
{
	return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1],
				ctx->rq_dispatched[0]);
}

static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page)
{
	return sprintf(page, "%lu\n", ctx->rq_merged);
}

static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page)
{
	return sprintf(page, "%lu %lu\n", ctx->rq_completed[1],
				ctx->rq_completed[0]);
}

static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg)
{
	struct request *rq;
	int len = snprintf(page, PAGE_SIZE - 1, "%s:\n", msg);

	list_for_each_entry(rq, list, queuelist) {
		const int rq_len = 2 * sizeof(rq) + 2;

		/* if the output will be truncated */
		if (PAGE_SIZE - 1 < len + rq_len) {
			/* backspacing if it can't hold '\t...\n' */
			if (PAGE_SIZE - 1 < len + 5)
				len -= rq_len;
			len += snprintf(page + len, PAGE_SIZE - 1 - len,
					"\t...\n");
			break;
		}
		len += snprintf(page + len, PAGE_SIZE - 1 - len,
				"\t%p\n", rq);
	}

	return len;
}

static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page)
{
	ssize_t ret;

	spin_lock(&ctx->lock);
	ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending");
	spin_unlock(&ctx->lock);

	return ret;
}

static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
					   char *page)
{
	return sprintf(page, "%lu\n", hctx->queued);
}

static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page)
{
	return sprintf(page, "%lu\n", hctx->run);
}

static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
					       char *page)
{
	char *start_page = page;
	int i;

	page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);

	for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
		unsigned long d = 1U << (i - 1);

		page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
	}

	return page - start_page;
}

static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
					    char *page)
{
	ssize_t ret;

	spin_lock(&hctx->lock);
	ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
	spin_unlock(&hctx->lock);

	return ret;
}

static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
{
	return blk_mq_tag_sysfs_show(hctx->tags, page);
}

static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page)
{
	return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
}

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_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
	.attr = {.name = "dispatched", .mode = S_IRUGO },
	.show = blk_mq_sysfs_dispatched_show,
};
static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
	.attr = {.name = "merged", .mode = S_IRUGO },
	.show = blk_mq_sysfs_merged_show,
};
static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
	.attr = {.name = "completed", .mode = S_IRUGO },
	.show = blk_mq_sysfs_completed_show,
};
static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
	.attr = {.name = "rq_list", .mode = S_IRUGO },
	.show = blk_mq_sysfs_rq_list_show,
};

static struct attribute *default_ctx_attrs[] = {
	&blk_mq_sysfs_dispatched.attr,
	&blk_mq_sysfs_merged.attr,
	&blk_mq_sysfs_completed.attr,
	&blk_mq_sysfs_rq_list.attr,
	NULL,
};

static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
	.attr = {.name = "queued", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_queued_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
	.attr = {.name = "run", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_run_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
	.attr = {.name = "dispatched", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_dispatched_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
	.attr = {.name = "active", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_active_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
	.attr = {.name = "pending", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_rq_list_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
	.attr = {.name = "tags", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_tags_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
	.attr = {.name = "cpu_list", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_cpus_show,
};

static struct attribute *default_hw_ctx_attrs[] = {
	&blk_mq_hw_sysfs_queued.attr,
	&blk_mq_hw_sysfs_run.attr,
	&blk_mq_hw_sysfs_dispatched.attr,
	&blk_mq_hw_sysfs_pending.attr,
	&blk_mq_hw_sysfs_tags.attr,
	&blk_mq_hw_sysfs_cpus.attr,
	&blk_mq_hw_sysfs_active.attr,
	NULL,
};

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,
	.default_attrs	= default_ctx_attrs,
	.release	= blk_mq_sysfs_release,
};

static struct kobj_type blk_mq_hw_ktype = {
	.sysfs_ops	= &blk_mq_hw_sysfs_ops,
	.default_attrs	= default_hw_ctx_attrs,
	.release	= blk_mq_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_disk(struct gendisk *disk)
{
	struct request_queue *q = disk->queue;
	struct blk_mq_hw_ctx *hctx;
	struct blk_mq_ctx *ctx;
	int i, j;

	blk_mq_disable_hotplug();

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

		hctx_for_each_ctx(hctx, ctx, j)
			kobject_put(&ctx->kobj);

		kobject_put(&hctx->kobj);
	}

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

	kobject_put(&disk_to_dev(disk)->kobj);

	q->mq_sysfs_init_done = false;
	blk_mq_enable_hotplug();
}

static void blk_mq_sysfs_init(struct request_queue *q)
{
	struct blk_mq_hw_ctx *hctx;
	struct blk_mq_ctx *ctx;
	int i;

	kobject_init(&q->mq_kobj, &blk_mq_ktype);

	queue_for_each_hw_ctx(q, hctx, i)
		kobject_init(&hctx->kobj, &blk_mq_hw_ktype);

	queue_for_each_ctx(q, ctx, i)
		kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
}

/* see blk_register_queue() */
void blk_mq_finish_init(struct request_queue *q)
{
	percpu_ref_switch_to_percpu(&q->mq_usage_counter);
}

int blk_mq_register_disk(struct gendisk *disk)
{
	struct device *dev = disk_to_dev(disk);
	struct request_queue *q = disk->queue;
	struct blk_mq_hw_ctx *hctx;
	int ret, i;

	blk_mq_disable_hotplug();

	blk_mq_sysfs_init(q);

	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)
			break;
	}

	if (ret)
		blk_mq_unregister_disk(disk);
	else
		q->mq_sysfs_init_done = true;
out:
	blk_mq_enable_hotplug();

	return ret;
}
EXPORT_SYMBOL_GPL(blk_mq_register_disk);

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

	if (!q->mq_sysfs_init_done)
		return;

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

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

	if (!q->mq_sysfs_init_done)
		return ret;

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

	return ret;
}
Commit	Line	Data
320ae51f JA	1	#include <linux/kernel.h>
	2	#include <linux/module.h>
	3	#include <linux/backing-dev.h>
	4	#include <linux/bio.h>
	5	#include <linux/blkdev.h>
	6	#include <linux/mm.h>
	7	#include <linux/init.h>
	8	#include <linux/slab.h>
	9	#include <linux/workqueue.h>
	10	#include <linux/smp.h>
	11
	12	#include <linux/blk-mq.h>
	13	#include "blk-mq.h"
	14	#include "blk-mq-tag.h"
	15
	16	static void blk_mq_sysfs_release(struct kobject *kobj)
	17	{
	18	}
	19
	20	struct blk_mq_ctx_sysfs_entry {
	21	struct attribute attr;
	22	ssize_t (show)(struct blk_mq_ctx , char *);
	23	ssize_t (store)(struct blk_mq_ctx , const char *, size_t);
	24	};
	25
	26	struct blk_mq_hw_ctx_sysfs_entry {
	27	struct attribute attr;
	28	ssize_t (show)(struct blk_mq_hw_ctx , char *);
	29	ssize_t (store)(struct blk_mq_hw_ctx , const char *, size_t);
	30	};
	31
	32	static ssize_t blk_mq_sysfs_show(struct kobject kobj, struct attribute attr,
	33	char *page)
	34	{
	35	struct blk_mq_ctx_sysfs_entry *entry;
	36	struct blk_mq_ctx *ctx;
	37	struct request_queue *q;
	38	ssize_t res;
	39
	40	entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
	41	ctx = container_of(kobj, struct blk_mq_ctx, kobj);
	42	q = ctx->queue;
	43
	44	if (!entry->show)
	45	return -EIO;
	46
	47	res = -ENOENT;
	48	mutex_lock(&q->sysfs_lock);
	49	if (!blk_queue_dying(q))
	50	res = entry->show(ctx, page);
	51	mutex_unlock(&q->sysfs_lock);
	52	return res;
	53	}
	54
	55	static ssize_t blk_mq_sysfs_store(struct kobject kobj, struct attribute attr,
	56	const char *page, size_t length)
	57	{
	58	struct blk_mq_ctx_sysfs_entry *entry;
	59	struct blk_mq_ctx *ctx;
	60	struct request_queue *q;
	61	ssize_t res;
	62
	63	entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
	64	ctx = container_of(kobj, struct blk_mq_ctx, kobj);
65	q = ctx->queue;
66
67	if (!entry->store)
68	return -EIO;
69
70	res = -ENOENT;
71	mutex_lock(&q->sysfs_lock);
72	if (!blk_queue_dying(q))
73	res = entry->store(ctx, page, length);
74	mutex_unlock(&q->sysfs_lock);
75	return res;
76	}
77
78	static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
79	struct attribute attr, char page)
80	{
81	struct blk_mq_hw_ctx_sysfs_entry *entry;
82	struct blk_mq_hw_ctx *hctx;
83	struct request_queue *q;
84	ssize_t res;
85
86	entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
87	hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
88	q = hctx->queue;
89
90	if (!entry->show)
91	return -EIO;
92
93	res = -ENOENT;
94	mutex_lock(&q->sysfs_lock);
95	if (!blk_queue_dying(q))
96	res = entry->show(hctx, page);
97	mutex_unlock(&q->sysfs_lock);
98	return res;
99	}
100
101	static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
102	struct attribute attr, const char page,
103	size_t length)
104	{
105	struct blk_mq_hw_ctx_sysfs_entry *entry;
106	struct blk_mq_hw_ctx *hctx;
107	struct request_queue *q;
108	ssize_t res;
109
110	entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
111	hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
112	q = hctx->queue;
113
114	if (!entry->store)
115	return -EIO;
116
117	res = -ENOENT;
118	mutex_lock(&q->sysfs_lock);
119	if (!blk_queue_dying(q))
120	res = entry->store(hctx, page, length);
121	mutex_unlock(&q->sysfs_lock);
122	return res;
123	}
124
125	static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx ctx, char page)
126	{
127	return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1],
128	ctx->rq_dispatched[0]);
129	}
130
131	static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx ctx, char page)
132	{
133	return sprintf(page, "%lu\n", ctx->rq_merged);
134	}
135
136	static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx ctx, char page)
137	{
138	return sprintf(page, "%lu %lu\n", ctx->rq_completed[1],
139	ctx->rq_completed[0]);
140	}
141
142	static ssize_t sysfs_list_show(char page, struct list_head list, char *msg)
143	{
320ae51f	144	struct request *rq;
596f5aad ML	145	int len = snprintf(page, PAGE_SIZE - 1, "%s:\n", msg);
	146
	147	list_for_each_entry(rq, list, queuelist) {
	148	const int rq_len = 2 * sizeof(rq) + 2;
	149
	150	/* if the output will be truncated */
	151	if (PAGE_SIZE - 1 < len + rq_len) {
	152	/* backspacing if it can't hold '\t...\n' */
	153	if (PAGE_SIZE - 1 < len + 5)
	154	len -= rq_len;
	155	len += snprintf(page + len, PAGE_SIZE - 1 - len,
	156	"\t...\n");
	157	break;
	158	}
	159	len += snprintf(page + len, PAGE_SIZE - 1 - len,
	160	"\t%p\n", rq);
	161	}
	162
	163	return len;
320ae51f JA	164	}
	165
	166	static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx ctx, char page)
	167	{
	168	ssize_t ret;
	169
	170	spin_lock(&ctx->lock);
	171	ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending");
	172	spin_unlock(&ctx->lock);
	173
	174	return ret;
	175	}
	176
	177	static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
	178	char *page)
	179	{
	180	return sprintf(page, "%lu\n", hctx->queued);
	181	}
	182
	183	static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx hctx, char page)
	184	{
	185	return sprintf(page, "%lu\n", hctx->run);
	186	}
	187
	188	static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
	189	char *page)
	190	{
	191	char *start_page = page;
	192	int i;
	193
	194	page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
	195
	196	for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
	197	unsigned long d = 1U << (i - 1);
	198
	199	page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
	200	}
	201
	202	return page - start_page;
	203	}
	204
	205	static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
	206	char *page)
	207	{
	208	ssize_t ret;
	209
	210	spin_lock(&hctx->lock);
	211	ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
	212	spin_unlock(&hctx->lock);
	213
	214	return ret;
	215	}
	216
320ae51f JA	217	static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx hctx, char page)
	218	{
	219	return blk_mq_tag_sysfs_show(hctx->tags, page);
	220	}
	221
0d2602ca JA	222	static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx hctx, char page)
	223	{
	224	return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
	225	}
	226
676141e4 JA	227	static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx hctx, char page)
676141e4 JA	228	{
cb2da43e	229	unsigned int i, first = 1;
676141e4 JA	230	ssize_t ret = 0;
676141e4 JA	231
cb2da43e	232	for_each_cpu(i, hctx->cpumask) {
676141e4 JA	233	if (first)
	234	ret += sprintf(ret + page, "%u", i);
	235	else
	236	ret += sprintf(ret + page, ", %u", i);
	237
	238	first = 0;
	239	}
	240
676141e4 JA	241	ret += sprintf(ret + page, "\n");
	242	return ret;
	243	}
	244
320ae51f JA	245	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
	246	.attr = {.name = "dispatched", .mode = S_IRUGO },
	247	.show = blk_mq_sysfs_dispatched_show,
	248	};
	249	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
	250	.attr = {.name = "merged", .mode = S_IRUGO },
	251	.show = blk_mq_sysfs_merged_show,
	252	};
	253	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
	254	.attr = {.name = "completed", .mode = S_IRUGO },
	255	.show = blk_mq_sysfs_completed_show,
	256	};
	257	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
	258	.attr = {.name = "rq_list", .mode = S_IRUGO },
	259	.show = blk_mq_sysfs_rq_list_show,
	260	};
	261
	262	static struct attribute *default_ctx_attrs[] = {
	263	&blk_mq_sysfs_dispatched.attr,
	264	&blk_mq_sysfs_merged.attr,
	265	&blk_mq_sysfs_completed.attr,
	266	&blk_mq_sysfs_rq_list.attr,
	267	NULL,
	268	};
	269
	270	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
	271	.attr = {.name = "queued", .mode = S_IRUGO },
	272	.show = blk_mq_hw_sysfs_queued_show,
	273	};
	274	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
	275	.attr = {.name = "run", .mode = S_IRUGO },
	276	.show = blk_mq_hw_sysfs_run_show,
	277	};
	278	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
	279	.attr = {.name = "dispatched", .mode = S_IRUGO },
	280	.show = blk_mq_hw_sysfs_dispatched_show,
	281	};
0d2602ca JA	282	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
	283	.attr = {.name = "active", .mode = S_IRUGO },
	284	.show = blk_mq_hw_sysfs_active_show,
	285	};
320ae51f JA	286	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
	287	.attr = {.name = "pending", .mode = S_IRUGO },
	288	.show = blk_mq_hw_sysfs_rq_list_show,
	289	};
320ae51f JA	290	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
	291	.attr = {.name = "tags", .mode = S_IRUGO },
	292	.show = blk_mq_hw_sysfs_tags_show,
	293	};
676141e4 JA	294	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
	295	.attr = {.name = "cpu_list", .mode = S_IRUGO },
	296	.show = blk_mq_hw_sysfs_cpus_show,
	297	};
320ae51f JA	298
	299	static struct attribute *default_hw_ctx_attrs[] = {
	300	&blk_mq_hw_sysfs_queued.attr,
	301	&blk_mq_hw_sysfs_run.attr,
	302	&blk_mq_hw_sysfs_dispatched.attr,
	303	&blk_mq_hw_sysfs_pending.attr,
320ae51f	304	&blk_mq_hw_sysfs_tags.attr,
676141e4	305	&blk_mq_hw_sysfs_cpus.attr,
0d2602ca	306	&blk_mq_hw_sysfs_active.attr,
320ae51f JA	307	NULL,
	308	};
	309
	310	static const struct sysfs_ops blk_mq_sysfs_ops = {
	311	.show = blk_mq_sysfs_show,
	312	.store = blk_mq_sysfs_store,
	313	};
	314
	315	static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
	316	.show = blk_mq_hw_sysfs_show,
	317	.store = blk_mq_hw_sysfs_store,
	318	};
	319
	320	static struct kobj_type blk_mq_ktype = {
	321	.sysfs_ops = &blk_mq_sysfs_ops,
	322	.release = blk_mq_sysfs_release,
	323	};
	324
	325	static struct kobj_type blk_mq_ctx_ktype = {
	326	.sysfs_ops = &blk_mq_sysfs_ops,
	327	.default_attrs = default_ctx_attrs,
74170118	328	.release = blk_mq_sysfs_release,
320ae51f JA	329	};
	330
	331	static struct kobj_type blk_mq_hw_ktype = {
	332	.sysfs_ops = &blk_mq_hw_sysfs_ops,
	333	.default_attrs = default_hw_ctx_attrs,
74170118	334	.release = blk_mq_sysfs_release,
320ae51f JA	335	};
320ae51f JA	336
ee3c5db0	337	static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
67aec14c JA	338	{
	339	struct blk_mq_ctx *ctx;
	340	int i;
	341
4593fdbe	342	if (!hctx->nr_ctx)
67aec14c JA	343	return;
	344
	345	hctx_for_each_ctx(hctx, ctx, i)
	346	kobject_del(&ctx->kobj);
	347
	348	kobject_del(&hctx->kobj);
	349	}
	350
ee3c5db0	351	static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
67aec14c JA	352	{
	353	struct request_queue *q = hctx->queue;
	354	struct blk_mq_ctx *ctx;
	355	int i, ret;
	356
4593fdbe	357	if (!hctx->nr_ctx)
67aec14c JA	358	return 0;
	359
	360	ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
	361	if (ret)
	362	return ret;
	363
	364	hctx_for_each_ctx(hctx, ctx, i) {
	365	ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
	366	if (ret)
	367	break;
	368	}
	369
	370	return ret;
	371	}
	372
320ae51f JA	373	void blk_mq_unregister_disk(struct gendisk *disk)
	374	{
	375	struct request_queue *q = disk->queue;
85157366 AV	376	struct blk_mq_hw_ctx *hctx;
	377	struct blk_mq_ctx *ctx;
	378	int i, j;
	379
4593fdbe AM	380	blk_mq_disable_hotplug();
4593fdbe AM	381
85157366	382	queue_for_each_hw_ctx(q, hctx, i) {
67aec14c JA	383	blk_mq_unregister_hctx(hctx);
	384
	385	hctx_for_each_ctx(hctx, ctx, j)
85157366	386	kobject_put(&ctx->kobj);
67aec14c	387
85157366 AV	388	kobject_put(&hctx->kobj);
85157366 AV	389	}
320ae51f JA	390
	391	kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
	392	kobject_del(&q->mq_kobj);
85157366	393	kobject_put(&q->mq_kobj);
320ae51f JA	394
320ae51f JA	395	kobject_put(&disk_to_dev(disk)->kobj);
4593fdbe AM	396
	397	q->mq_sysfs_init_done = false;
	398	blk_mq_enable_hotplug();
320ae51f JA	399	}
320ae51f JA	400
67aec14c JA	401	static void blk_mq_sysfs_init(struct request_queue *q)
	402	{
	403	struct blk_mq_hw_ctx *hctx;
	404	struct blk_mq_ctx *ctx;
06a41a99	405	int i;
67aec14c JA	406
	407	kobject_init(&q->mq_kobj, &blk_mq_ktype);
	408
06a41a99	409	queue_for_each_hw_ctx(q, hctx, i)
67aec14c JA	410	kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
67aec14c JA	411
06a41a99 TI	412	queue_for_each_ctx(q, ctx, i)
06a41a99 TI	413	kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
67aec14c JA	414	}
67aec14c JA	415
17497acb TH	416	/* see blk_register_queue() */
	417	void blk_mq_finish_init(struct request_queue *q)
	418	{
	419	percpu_ref_switch_to_percpu(&q->mq_usage_counter);
	420	}
	421
320ae51f JA	422	int blk_mq_register_disk(struct gendisk *disk)
	423	{
	424	struct device *dev = disk_to_dev(disk);
	425	struct request_queue *q = disk->queue;
	426	struct blk_mq_hw_ctx *hctx;
67aec14c	427	int ret, i;
320ae51f	428
4593fdbe AM	429	blk_mq_disable_hotplug();
4593fdbe AM	430
67aec14c	431	blk_mq_sysfs_init(q);
320ae51f JA	432
	433	ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
	434	if (ret < 0)
4593fdbe	435	goto out;
320ae51f JA	436
	437	kobject_uevent(&q->mq_kobj, KOBJ_ADD);
	438
	439	queue_for_each_hw_ctx(q, hctx, i) {
67aec14c	440	ret = blk_mq_register_hctx(hctx);
320ae51f JA	441	if (ret)
320ae51f JA	442	break;
320ae51f JA	443	}
320ae51f JA	444
4593fdbe	445	if (ret)
320ae51f	446	blk_mq_unregister_disk(disk);
4593fdbe AM	447	else
	448	q->mq_sysfs_init_done = true;
	449	out:
	450	blk_mq_enable_hotplug();
320ae51f	451
4593fdbe	452	return ret;
320ae51f	453	}
b62c21b7	454	EXPORT_SYMBOL_GPL(blk_mq_register_disk);
67aec14c JA	455
	456	void blk_mq_sysfs_unregister(struct request_queue *q)
	457	{
	458	struct blk_mq_hw_ctx *hctx;
	459	int i;
	460
4593fdbe AM	461	if (!q->mq_sysfs_init_done)
	462	return;
	463
67aec14c JA	464	queue_for_each_hw_ctx(q, hctx, i)
	465	blk_mq_unregister_hctx(hctx);
	466	}
	467
	468	int blk_mq_sysfs_register(struct request_queue *q)
	469	{
	470	struct blk_mq_hw_ctx *hctx;
	471	int i, ret = 0;
	472
4593fdbe AM	473	if (!q->mq_sysfs_init_done)
	474	return ret;
	475
67aec14c JA	476	queue_for_each_hw_ctx(q, hctx, i) {
	477	ret = blk_mq_register_hctx(hctx);
	478	if (ret)
	479	break;
	480	}
	481
	482	return ret;
	483	}