[mirror_ubuntu-bionic-kernel.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_poll_show(struct blk_mq_hw_ctx *hctx, char *page)
{
	return sprintf(page, "considered=%lu, invoked=%lu, success=%lu\n",
		       hctx->poll_considered, hctx->poll_invoked,
		       hctx->poll_success);
}

static ssize_t blk_mq_hw_sysfs_poll_store(struct blk_mq_hw_ctx *hctx,
					  const char *page, size_t size)
{
	hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;

	return size;
}

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 - 1; i++) {
		unsigned int d = 1U << (i - 1);

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

	page += sprintf(page, "%8u+\t%lu\n", 1U << (i - 1),
						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_sched_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
{
	if (hctx->sched_tags)
		return blk_mq_tag_sysfs_show(hctx->sched_tags, page);

	return 0;
}

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 void blk_mq_stat_clear(struct blk_mq_hw_ctx *hctx)
{
	struct blk_mq_ctx *ctx;
	unsigned int i;

	hctx_for_each_ctx(hctx, ctx, i) {
		blk_stat_init(&ctx->stat[BLK_STAT_READ]);
		blk_stat_init(&ctx->stat[BLK_STAT_WRITE]);
	}
}

static ssize_t blk_mq_hw_sysfs_stat_store(struct blk_mq_hw_ctx *hctx,
					  const char *page, size_t count)
{
	blk_mq_stat_clear(hctx);
	return count;
}

static ssize_t print_stat(char *page, struct blk_rq_stat *stat, const char *pre)
{
	return sprintf(page, "%s samples=%llu, mean=%lld, min=%lld, max=%lld\n",
			pre, (long long) stat->nr_samples,
			(long long) stat->mean, (long long) stat->min,
			(long long) stat->max);
}

static ssize_t blk_mq_hw_sysfs_stat_show(struct blk_mq_hw_ctx *hctx, char *page)
{
	struct blk_rq_stat stat[2];
	ssize_t ret;

	blk_stat_init(&stat[BLK_STAT_READ]);
	blk_stat_init(&stat[BLK_STAT_WRITE]);

	blk_hctx_stat_get(hctx, stat);

	ret = print_stat(page, &stat[BLK_STAT_READ], "read :");
	ret += print_stat(page + ret, &stat[BLK_STAT_WRITE], "write:");
	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_sched_tags = {
	.attr = {.name = "sched_tags", .mode = S_IRUGO },
	.show = blk_mq_hw_sysfs_sched_tags_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 blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_poll = {
	.attr = {.name = "io_poll", .mode = S_IWUSR | S_IRUGO },
	.show = blk_mq_hw_sysfs_poll_show,
	.store = blk_mq_hw_sysfs_poll_store,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_stat = {
	.attr = {.name = "stats", .mode = S_IRUGO | S_IWUSR },
	.show = blk_mq_hw_sysfs_stat_show,
	.store = blk_mq_hw_sysfs_stat_store,
};

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_sched_tags.attr,
	&blk_mq_hw_sysfs_cpus.attr,
	&blk_mq_hw_sysfs_active.attr,
	&blk_mq_hw_sysfs_poll.attr,
	&blk_mq_hw_sysfs_stat.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;
}

static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
{
	struct blk_mq_hw_ctx *hctx;
	struct blk_mq_ctx *ctx;
	int i, j;

	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(&dev->kobj);

	q->mq_sysfs_init_done = false;
}

void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
{
	blk_mq_disable_hotplug();
	__blk_mq_unregister_dev(dev, q);
	blk_mq_enable_hotplug();
}

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

static 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_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;

	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_dev(dev, q);
	else
		q->mq_sysfs_init_done = true;
out:
	blk_mq_enable_hotplug();

	return ret;
}
EXPORT_SYMBOL_GPL(blk_mq_register_dev);

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
05229bee JA	177	static ssize_t blk_mq_hw_sysfs_poll_show(struct blk_mq_hw_ctx hctx, char page)
05229bee JA	178	{
6e219353 SB	179	return sprintf(page, "considered=%lu, invoked=%lu, success=%lu\n",
	180	hctx->poll_considered, hctx->poll_invoked,
	181	hctx->poll_success);
05229bee JA	182	}
05229bee JA	183
d21ea4bc SB	184	static ssize_t blk_mq_hw_sysfs_poll_store(struct blk_mq_hw_ctx *hctx,
	185	const char *page, size_t size)
	186	{
	187	hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
	188
	189	return size;
	190	}
	191
320ae51f JA	192	static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
	193	char *page)
	194	{
	195	return sprintf(page, "%lu\n", hctx->queued);
	196	}
	197
	198	static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx hctx, char page)
	199	{
	200	return sprintf(page, "%lu\n", hctx->run);
	201	}
	202
	203	static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
	204	char *page)
	205	{
	206	char *start_page = page;
	207	int i;
	208
	209	page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
	210
703fd1c0 JA	211	for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
703fd1c0 JA	212	unsigned int d = 1U << (i - 1);
320ae51f	213
703fd1c0	214	page += sprintf(page, "%8u\t%lu\n", d, hctx->dispatched[i]);
320ae51f JA	215	}
320ae51f JA	216
703fd1c0 JA	217	page += sprintf(page, "%8u+\t%lu\n", 1U << (i - 1),
703fd1c0 JA	218	hctx->dispatched[i]);
320ae51f JA	219	return page - start_page;
	220	}
	221
	222	static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
	223	char *page)
	224	{
	225	ssize_t ret;
	226
	227	spin_lock(&hctx->lock);
	228	ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
	229	spin_unlock(&hctx->lock);
	230
	231	return ret;
	232	}
	233
bd166ef1 JA	234	static ssize_t blk_mq_hw_sysfs_sched_tags_show(struct blk_mq_hw_ctx hctx, char page)
	235	{
	236	if (hctx->sched_tags)
	237	return blk_mq_tag_sysfs_show(hctx->sched_tags, page);
	238
	239	return 0;
	240	}
	241
320ae51f JA	242	static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx hctx, char page)
	243	{
	244	return blk_mq_tag_sysfs_show(hctx->tags, page);
	245	}
	246
0d2602ca JA	247	static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx hctx, char page)
	248	{
	249	return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
	250	}
	251
676141e4 JA	252	static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx hctx, char page)
676141e4 JA	253	{
cb2da43e	254	unsigned int i, first = 1;
676141e4 JA	255	ssize_t ret = 0;
676141e4 JA	256
cb2da43e	257	for_each_cpu(i, hctx->cpumask) {
676141e4 JA	258	if (first)
	259	ret += sprintf(ret + page, "%u", i);
	260	else
	261	ret += sprintf(ret + page, ", %u", i);
	262
	263	first = 0;
	264	}
	265
676141e4 JA	266	ret += sprintf(ret + page, "\n");
	267	return ret;
	268	}
	269
cf43e6be JA	270	static void blk_mq_stat_clear(struct blk_mq_hw_ctx *hctx)
	271	{
	272	struct blk_mq_ctx *ctx;
	273	unsigned int i;
	274
	275	hctx_for_each_ctx(hctx, ctx, i) {
	276	blk_stat_init(&ctx->stat[BLK_STAT_READ]);
	277	blk_stat_init(&ctx->stat[BLK_STAT_WRITE]);
	278	}
	279	}
	280
	281	static ssize_t blk_mq_hw_sysfs_stat_store(struct blk_mq_hw_ctx *hctx,
	282	const char *page, size_t count)
	283	{
	284	blk_mq_stat_clear(hctx);
	285	return count;
	286	}
	287
	288	static ssize_t print_stat(char page, struct blk_rq_stat stat, const char *pre)
	289	{
	290	return sprintf(page, "%s samples=%llu, mean=%lld, min=%lld, max=%lld\n",
	291	pre, (long long) stat->nr_samples,
	292	(long long) stat->mean, (long long) stat->min,
	293	(long long) stat->max);
	294	}
	295
	296	static ssize_t blk_mq_hw_sysfs_stat_show(struct blk_mq_hw_ctx hctx, char page)
	297	{
	298	struct blk_rq_stat stat[2];
	299	ssize_t ret;
	300
	301	blk_stat_init(&stat[BLK_STAT_READ]);
	302	blk_stat_init(&stat[BLK_STAT_WRITE]);
	303
	304	blk_hctx_stat_get(hctx, stat);
	305
	306	ret = print_stat(page, &stat[BLK_STAT_READ], "read :");
	307	ret += print_stat(page + ret, &stat[BLK_STAT_WRITE], "write:");
	308	return ret;
	309	}
	310
320ae51f JA	311	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
	312	.attr = {.name = "dispatched", .mode = S_IRUGO },
	313	.show = blk_mq_sysfs_dispatched_show,
	314	};
	315	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
	316	.attr = {.name = "merged", .mode = S_IRUGO },
	317	.show = blk_mq_sysfs_merged_show,
	318	};
	319	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
	320	.attr = {.name = "completed", .mode = S_IRUGO },
	321	.show = blk_mq_sysfs_completed_show,
	322	};
	323	static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
	324	.attr = {.name = "rq_list", .mode = S_IRUGO },
	325	.show = blk_mq_sysfs_rq_list_show,
	326	};
	327
	328	static struct attribute *default_ctx_attrs[] = {
	329	&blk_mq_sysfs_dispatched.attr,
	330	&blk_mq_sysfs_merged.attr,
	331	&blk_mq_sysfs_completed.attr,
	332	&blk_mq_sysfs_rq_list.attr,
	333	NULL,
	334	};
	335
	336	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
	337	.attr = {.name = "queued", .mode = S_IRUGO },
	338	.show = blk_mq_hw_sysfs_queued_show,
	339	};
	340	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
	341	.attr = {.name = "run", .mode = S_IRUGO },
	342	.show = blk_mq_hw_sysfs_run_show,
	343	};
	344	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
	345	.attr = {.name = "dispatched", .mode = S_IRUGO },
	346	.show = blk_mq_hw_sysfs_dispatched_show,
	347	};
0d2602ca JA	348	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
	349	.attr = {.name = "active", .mode = S_IRUGO },
	350	.show = blk_mq_hw_sysfs_active_show,
	351	};
320ae51f JA	352	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
	353	.attr = {.name = "pending", .mode = S_IRUGO },
	354	.show = blk_mq_hw_sysfs_rq_list_show,
	355	};
bd166ef1 JA	356	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_sched_tags = {
	357	.attr = {.name = "sched_tags", .mode = S_IRUGO },
	358	.show = blk_mq_hw_sysfs_sched_tags_show,
	359	};
320ae51f JA	360	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
	361	.attr = {.name = "tags", .mode = S_IRUGO },
	362	.show = blk_mq_hw_sysfs_tags_show,
	363	};
676141e4 JA	364	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
	365	.attr = {.name = "cpu_list", .mode = S_IRUGO },
	366	.show = blk_mq_hw_sysfs_cpus_show,
	367	};
05229bee	368	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_poll = {
d21ea4bc	369	.attr = {.name = "io_poll", .mode = S_IWUSR \| S_IRUGO },
05229bee	370	.show = blk_mq_hw_sysfs_poll_show,
d21ea4bc	371	.store = blk_mq_hw_sysfs_poll_store,
05229bee	372	};
cf43e6be JA	373	static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_stat = {
	374	.attr = {.name = "stats", .mode = S_IRUGO \| S_IWUSR },
	375	.show = blk_mq_hw_sysfs_stat_show,
	376	.store = blk_mq_hw_sysfs_stat_store,
	377	};
320ae51f JA	378
	379	static struct attribute *default_hw_ctx_attrs[] = {
	380	&blk_mq_hw_sysfs_queued.attr,
	381	&blk_mq_hw_sysfs_run.attr,
	382	&blk_mq_hw_sysfs_dispatched.attr,
	383	&blk_mq_hw_sysfs_pending.attr,
320ae51f	384	&blk_mq_hw_sysfs_tags.attr,
bd166ef1	385	&blk_mq_hw_sysfs_sched_tags.attr,
676141e4	386	&blk_mq_hw_sysfs_cpus.attr,
0d2602ca	387	&blk_mq_hw_sysfs_active.attr,
05229bee	388	&blk_mq_hw_sysfs_poll.attr,
cf43e6be	389	&blk_mq_hw_sysfs_stat.attr,
320ae51f JA	390	NULL,
	391	};
	392
	393	static const struct sysfs_ops blk_mq_sysfs_ops = {
	394	.show = blk_mq_sysfs_show,
	395	.store = blk_mq_sysfs_store,
	396	};
	397
	398	static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
	399	.show = blk_mq_hw_sysfs_show,
	400	.store = blk_mq_hw_sysfs_store,
	401	};
	402
	403	static struct kobj_type blk_mq_ktype = {
	404	.sysfs_ops = &blk_mq_sysfs_ops,
	405	.release = blk_mq_sysfs_release,
	406	};
	407
	408	static struct kobj_type blk_mq_ctx_ktype = {
	409	.sysfs_ops = &blk_mq_sysfs_ops,
	410	.default_attrs = default_ctx_attrs,
74170118	411	.release = blk_mq_sysfs_release,
320ae51f JA	412	};
	413
	414	static struct kobj_type blk_mq_hw_ktype = {
	415	.sysfs_ops = &blk_mq_hw_sysfs_ops,
	416	.default_attrs = default_hw_ctx_attrs,
74170118	417	.release = blk_mq_sysfs_release,
320ae51f JA	418	};
320ae51f JA	419
ee3c5db0	420	static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
67aec14c JA	421	{
	422	struct blk_mq_ctx *ctx;
	423	int i;
	424
4593fdbe	425	if (!hctx->nr_ctx)
67aec14c JA	426	return;
	427
	428	hctx_for_each_ctx(hctx, ctx, i)
	429	kobject_del(&ctx->kobj);
	430
	431	kobject_del(&hctx->kobj);
	432	}
	433
ee3c5db0	434	static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
67aec14c JA	435	{
	436	struct request_queue *q = hctx->queue;
	437	struct blk_mq_ctx *ctx;
	438	int i, ret;
	439
4593fdbe	440	if (!hctx->nr_ctx)
67aec14c JA	441	return 0;
	442
	443	ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
	444	if (ret)
	445	return ret;
	446
	447	hctx_for_each_ctx(hctx, ctx, i) {
	448	ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
	449	if (ret)
	450	break;
	451	}
	452
	453	return ret;
	454	}
	455
b21d5b30	456	static void __blk_mq_unregister_dev(struct device dev, struct request_queue q)
320ae51f	457	{
85157366 AV	458	struct blk_mq_hw_ctx *hctx;
	459	struct blk_mq_ctx *ctx;
	460	int i, j;
	461
	462	queue_for_each_hw_ctx(q, hctx, i) {
67aec14c JA	463	blk_mq_unregister_hctx(hctx);
	464
	465	hctx_for_each_ctx(hctx, ctx, j)
85157366	466	kobject_put(&ctx->kobj);
67aec14c	467
85157366 AV	468	kobject_put(&hctx->kobj);
85157366 AV	469	}
320ae51f JA	470
	471	kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
	472	kobject_del(&q->mq_kobj);
85157366	473	kobject_put(&q->mq_kobj);
320ae51f	474
b21d5b30	475	kobject_put(&dev->kobj);
4593fdbe AM	476
4593fdbe AM	477	q->mq_sysfs_init_done = false;
c0f3fd2b JA	478	}
c0f3fd2b JA	479
b21d5b30	480	void blk_mq_unregister_dev(struct device dev, struct request_queue q)
c0f3fd2b JA	481	{
c0f3fd2b JA	482	blk_mq_disable_hotplug();
b21d5b30	483	__blk_mq_unregister_dev(dev, q);
4593fdbe	484	blk_mq_enable_hotplug();
320ae51f JA	485	}
320ae51f JA	486
868f2f0b KB	487	void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
	488	{
	489	kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
	490	}
	491
67aec14c JA	492	static void blk_mq_sysfs_init(struct request_queue *q)
67aec14c JA	493	{
67aec14c	494	struct blk_mq_ctx *ctx;
897bb0c7	495	int cpu;
67aec14c JA	496
	497	kobject_init(&q->mq_kobj, &blk_mq_ktype);
	498
897bb0c7 TG	499	for_each_possible_cpu(cpu) {
897bb0c7 TG	500	ctx = per_cpu_ptr(q->queue_ctx, cpu);
06a41a99	501	kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
897bb0c7	502	}
67aec14c JA	503	}
67aec14c JA	504
b21d5b30	505	int blk_mq_register_dev(struct device dev, struct request_queue q)
320ae51f	506	{
320ae51f	507	struct blk_mq_hw_ctx *hctx;
67aec14c	508	int ret, i;
320ae51f	509
4593fdbe AM	510	blk_mq_disable_hotplug();
4593fdbe AM	511
67aec14c	512	blk_mq_sysfs_init(q);
320ae51f JA	513
	514	ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
	515	if (ret < 0)
4593fdbe	516	goto out;
320ae51f JA	517
	518	kobject_uevent(&q->mq_kobj, KOBJ_ADD);
	519
	520	queue_for_each_hw_ctx(q, hctx, i) {
67aec14c	521	ret = blk_mq_register_hctx(hctx);
320ae51f JA	522	if (ret)
320ae51f JA	523	break;
320ae51f JA	524	}
320ae51f JA	525
4593fdbe	526	if (ret)
b21d5b30	527	__blk_mq_unregister_dev(dev, q);
4593fdbe AM	528	else
	529	q->mq_sysfs_init_done = true;
	530	out:
	531	blk_mq_enable_hotplug();
320ae51f	532
4593fdbe	533	return ret;
320ae51f	534	}
b21d5b30	535	EXPORT_SYMBOL_GPL(blk_mq_register_dev);
67aec14c JA	536
	537	void blk_mq_sysfs_unregister(struct request_queue *q)
	538	{
	539	struct blk_mq_hw_ctx *hctx;
	540	int i;
	541
4593fdbe AM	542	if (!q->mq_sysfs_init_done)
	543	return;
	544
67aec14c JA	545	queue_for_each_hw_ctx(q, hctx, i)
	546	blk_mq_unregister_hctx(hctx);
	547	}
	548
	549	int blk_mq_sysfs_register(struct request_queue *q)
	550	{
	551	struct blk_mq_hw_ctx *hctx;
	552	int i, ret = 0;
	553
4593fdbe AM	554	if (!q->mq_sysfs_init_done)
	555	return ret;
	556
67aec14c JA	557	queue_for_each_hw_ctx(q, hctx, i) {
	558	ret = blk_mq_register_hctx(hctx);
	559	if (ret)
	560	break;
	561	}
	562
	563	return ret;
	564	}