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

/*
 * Functions related to sysfs handling
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/blktrace_api.h>

#include "blk.h"
#include "blk-cgroup.h"

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

static ssize_t
queue_var_show(unsigned long var, char *page)
{
	return sprintf(page, "%lu\n", var);
}

static ssize_t
queue_var_store(unsigned long *var, const char *page, size_t count)
{
	int err;
	unsigned long v;

	err = strict_strtoul(page, 10, &v);
	if (err || v > UINT_MAX)
		return -EINVAL;

	*var = v;

	return count;
}

static ssize_t queue_requests_show(struct request_queue *q, char *page)
{
	return queue_var_show(q->nr_requests, (page));
}

static ssize_t
queue_requests_store(struct request_queue *q, const char *page, size_t count)
{
	struct request_list *rl;
	unsigned long nr;
	int ret;

	if (!q->request_fn)
		return -EINVAL;

	ret = queue_var_store(&nr, page, count);
	if (ret < 0)
		return ret;

	if (nr < BLKDEV_MIN_RQ)
		nr = BLKDEV_MIN_RQ;

	spin_lock_irq(q->queue_lock);
	q->nr_requests = nr;
	blk_queue_congestion_threshold(q);

	/* congestion isn't cgroup aware and follows root blkcg for now */
	rl = &q->root_rl;

	if (rl->count[BLK_RW_SYNC] >= queue_congestion_on_threshold(q))
		blk_set_queue_congested(q, BLK_RW_SYNC);
	else if (rl->count[BLK_RW_SYNC] < queue_congestion_off_threshold(q))
		blk_clear_queue_congested(q, BLK_RW_SYNC);

	if (rl->count[BLK_RW_ASYNC] >= queue_congestion_on_threshold(q))
		blk_set_queue_congested(q, BLK_RW_ASYNC);
	else if (rl->count[BLK_RW_ASYNC] < queue_congestion_off_threshold(q))
		blk_clear_queue_congested(q, BLK_RW_ASYNC);

	blk_queue_for_each_rl(rl, q) {
		if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
			blk_set_rl_full(rl, BLK_RW_SYNC);
		} else {
			blk_clear_rl_full(rl, BLK_RW_SYNC);
			wake_up(&rl->wait[BLK_RW_SYNC]);
		}

		if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
			blk_set_rl_full(rl, BLK_RW_ASYNC);
		} else {
			blk_clear_rl_full(rl, BLK_RW_ASYNC);
			wake_up(&rl->wait[BLK_RW_ASYNC]);
		}
	}

	spin_unlock_irq(q->queue_lock);
	return ret;
}

static ssize_t queue_ra_show(struct request_queue *q, char *page)
{
	unsigned long ra_kb = q->backing_dev_info.ra_pages <<
					(PAGE_CACHE_SHIFT - 10);

	return queue_var_show(ra_kb, (page));
}

static ssize_t
queue_ra_store(struct request_queue *q, const char *page, size_t count)
{
	unsigned long ra_kb;
	ssize_t ret = queue_var_store(&ra_kb, page, count);

	if (ret < 0)
		return ret;

	q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);

	return ret;
}

static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
{
	int max_sectors_kb = queue_max_sectors(q) >> 1;

	return queue_var_show(max_sectors_kb, (page));
}

static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
{
	return queue_var_show(queue_max_segments(q), (page));
}

static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
{
	return queue_var_show(q->limits.max_integrity_segments, (page));
}

static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
{
	if (blk_queue_cluster(q))
		return queue_var_show(queue_max_segment_size(q), (page));

	return queue_var_show(PAGE_CACHE_SIZE, (page));
}

static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
{
	return queue_var_show(queue_logical_block_size(q), page);
}

static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
{
	return queue_var_show(queue_physical_block_size(q), page);
}

static ssize_t queue_io_min_show(struct request_queue *q, char *page)
{
	return queue_var_show(queue_io_min(q), page);
}

static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
{
	return queue_var_show(queue_io_opt(q), page);
}

static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
{
	return queue_var_show(q->limits.discard_granularity, page);
}

static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
{
	return sprintf(page, "%llu\n",
		       (unsigned long long)q->limits.max_discard_sectors << 9);
}

static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
{
	return queue_var_show(queue_discard_zeroes_data(q), page);
}

static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
{
	return sprintf(page, "%llu\n",
		(unsigned long long)q->limits.max_write_same_sectors << 9);
}


static ssize_t
queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
{
	unsigned long max_sectors_kb,
		max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
			page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
	ssize_t ret = queue_var_store(&max_sectors_kb, page, count);

	if (ret < 0)
		return ret;

	if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
		return -EINVAL;

	spin_lock_irq(q->queue_lock);
	q->limits.max_sectors = max_sectors_kb << 1;
	spin_unlock_irq(q->queue_lock);

	return ret;
}

static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
{
	int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;

	return queue_var_show(max_hw_sectors_kb, (page));
}

#define QUEUE_SYSFS_BIT_FNS(name, flag, neg)				\
static ssize_t								\
queue_show_##name(struct request_queue *q, char *page)			\
{									\
	int bit;							\
	bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags);		\
	return queue_var_show(neg ? !bit : bit, page);			\
}									\
static ssize_t								\
queue_store_##name(struct request_queue *q, const char *page, size_t count) \
{									\
	unsigned long val;						\
	ssize_t ret;							\
	ret = queue_var_store(&val, page, count);			\
	if (neg)							\
		val = !val;						\
									\
	spin_lock_irq(q->queue_lock);					\
	if (val)							\
		queue_flag_set(QUEUE_FLAG_##flag, q);			\
	else								\
		queue_flag_clear(QUEUE_FLAG_##flag, q);			\
	spin_unlock_irq(q->queue_lock);					\
	return ret;							\
}

QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
#undef QUEUE_SYSFS_BIT_FNS

static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
{
	return queue_var_show((blk_queue_nomerges(q) << 1) |
			       blk_queue_noxmerges(q), page);
}

static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
				    size_t count)
{
	unsigned long nm;
	ssize_t ret = queue_var_store(&nm, page, count);

	if (ret < 0)
		return ret;

	spin_lock_irq(q->queue_lock);
	queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
	queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
	if (nm == 2)
		queue_flag_set(QUEUE_FLAG_NOMERGES, q);
	else if (nm)
		queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
	spin_unlock_irq(q->queue_lock);

	return ret;
}

static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
{
	bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
	bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);

	return queue_var_show(set << force, page);
}

static ssize_t
queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
{
	ssize_t ret = -EINVAL;
#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
	unsigned long val;

	ret = queue_var_store(&val, page, count);
	if (ret < 0)
		return ret;

	spin_lock_irq(q->queue_lock);
	if (val == 2) {
		queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
		queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
	} else if (val == 1) {
		queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
		queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
	} else if (val == 0) {
		queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
		queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
	}
	spin_unlock_irq(q->queue_lock);
#endif
	return ret;
}

static struct queue_sysfs_entry queue_requests_entry = {
	.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
	.show = queue_requests_show,
	.store = queue_requests_store,
};

static struct queue_sysfs_entry queue_ra_entry = {
	.attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
	.show = queue_ra_show,
	.store = queue_ra_store,
};

static struct queue_sysfs_entry queue_max_sectors_entry = {
	.attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
	.show = queue_max_sectors_show,
	.store = queue_max_sectors_store,
};

static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
	.attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
	.show = queue_max_hw_sectors_show,
};

static struct queue_sysfs_entry queue_max_segments_entry = {
	.attr = {.name = "max_segments", .mode = S_IRUGO },
	.show = queue_max_segments_show,
};

static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
	.attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
	.show = queue_max_integrity_segments_show,
};

static struct queue_sysfs_entry queue_max_segment_size_entry = {
	.attr = {.name = "max_segment_size", .mode = S_IRUGO },
	.show = queue_max_segment_size_show,
};

static struct queue_sysfs_entry queue_iosched_entry = {
	.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
	.show = elv_iosched_show,
	.store = elv_iosched_store,
};

static struct queue_sysfs_entry queue_hw_sector_size_entry = {
	.attr = {.name = "hw_sector_size", .mode = S_IRUGO },
	.show = queue_logical_block_size_show,
};

static struct queue_sysfs_entry queue_logical_block_size_entry = {
	.attr = {.name = "logical_block_size", .mode = S_IRUGO },
	.show = queue_logical_block_size_show,
};

static struct queue_sysfs_entry queue_physical_block_size_entry = {
	.attr = {.name = "physical_block_size", .mode = S_IRUGO },
	.show = queue_physical_block_size_show,
};

static struct queue_sysfs_entry queue_io_min_entry = {
	.attr = {.name = "minimum_io_size", .mode = S_IRUGO },
	.show = queue_io_min_show,
};

static struct queue_sysfs_entry queue_io_opt_entry = {
	.attr = {.name = "optimal_io_size", .mode = S_IRUGO },
	.show = queue_io_opt_show,
};

static struct queue_sysfs_entry queue_discard_granularity_entry = {
	.attr = {.name = "discard_granularity", .mode = S_IRUGO },
	.show = queue_discard_granularity_show,
};

static struct queue_sysfs_entry queue_discard_max_entry = {
	.attr = {.name = "discard_max_bytes", .mode = S_IRUGO },
	.show = queue_discard_max_show,
};

static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
	.attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
	.show = queue_discard_zeroes_data_show,
};

static struct queue_sysfs_entry queue_write_same_max_entry = {
	.attr = {.name = "write_same_max_bytes", .mode = S_IRUGO },
	.show = queue_write_same_max_show,
};

static struct queue_sysfs_entry queue_nonrot_entry = {
	.attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
	.show = queue_show_nonrot,
	.store = queue_store_nonrot,
};

static struct queue_sysfs_entry queue_nomerges_entry = {
	.attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
	.show = queue_nomerges_show,
	.store = queue_nomerges_store,
};

static struct queue_sysfs_entry queue_rq_affinity_entry = {
	.attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
	.show = queue_rq_affinity_show,
	.store = queue_rq_affinity_store,
};

static struct queue_sysfs_entry queue_iostats_entry = {
	.attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
	.show = queue_show_iostats,
	.store = queue_store_iostats,
};

static struct queue_sysfs_entry queue_random_entry = {
	.attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
	.show = queue_show_random,
	.store = queue_store_random,
};

static struct attribute *default_attrs[] = {
	&queue_requests_entry.attr,
	&queue_ra_entry.attr,
	&queue_max_hw_sectors_entry.attr,
	&queue_max_sectors_entry.attr,
	&queue_max_segments_entry.attr,
	&queue_max_integrity_segments_entry.attr,
	&queue_max_segment_size_entry.attr,
	&queue_iosched_entry.attr,
	&queue_hw_sector_size_entry.attr,
	&queue_logical_block_size_entry.attr,
	&queue_physical_block_size_entry.attr,
	&queue_io_min_entry.attr,
	&queue_io_opt_entry.attr,
	&queue_discard_granularity_entry.attr,
	&queue_discard_max_entry.attr,
	&queue_discard_zeroes_data_entry.attr,
	&queue_write_same_max_entry.attr,
	&queue_nonrot_entry.attr,
	&queue_nomerges_entry.attr,
	&queue_rq_affinity_entry.attr,
	&queue_iostats_entry.attr,
	&queue_random_entry.attr,
	NULL,
};

#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)

static ssize_t
queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
	struct queue_sysfs_entry *entry = to_queue(attr);
	struct request_queue *q =
		container_of(kobj, struct request_queue, kobj);
	ssize_t res;

	if (!entry->show)
		return -EIO;
	mutex_lock(&q->sysfs_lock);
	if (blk_queue_dead(q)) {
		mutex_unlock(&q->sysfs_lock);
		return -ENOENT;
	}
	res = entry->show(q, page);
	mutex_unlock(&q->sysfs_lock);
	return res;
}

static ssize_t
queue_attr_store(struct kobject *kobj, struct attribute *attr,
		    const char *page, size_t length)
{
	struct queue_sysfs_entry *entry = to_queue(attr);
	struct request_queue *q;
	ssize_t res;

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

	q = container_of(kobj, struct request_queue, kobj);
	mutex_lock(&q->sysfs_lock);
	if (blk_queue_dead(q)) {
		mutex_unlock(&q->sysfs_lock);
		return -ENOENT;
	}
	res = entry->store(q, page, length);
	mutex_unlock(&q->sysfs_lock);
	return res;
}

/**
 * blk_release_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging to the request queue to be released
 *
 * Description:
 *     blk_release_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Caveat:
 *     Hopefully the low level driver will have finished any
 *     outstanding requests first...
 **/
static void blk_release_queue(struct kobject *kobj)
{
	struct request_queue *q =
		container_of(kobj, struct request_queue, kobj);

	blk_sync_queue(q);

	blkcg_exit_queue(q);

	if (q->elevator) {
		spin_lock_irq(q->queue_lock);
		ioc_clear_queue(q);
		spin_unlock_irq(q->queue_lock);
		elevator_exit(q->elevator);
	}

	blk_exit_rl(&q->root_rl);

	if (q->queue_tags)
		__blk_queue_free_tags(q);

	blk_trace_shutdown(q);

	bdi_destroy(&q->backing_dev_info);

	ida_simple_remove(&blk_queue_ida, q->id);
	kmem_cache_free(blk_requestq_cachep, q);
}

static const struct sysfs_ops queue_sysfs_ops = {
	.show	= queue_attr_show,
	.store	= queue_attr_store,
};

struct kobj_type blk_queue_ktype = {
	.sysfs_ops	= &queue_sysfs_ops,
	.default_attrs	= default_attrs,
	.release	= blk_release_queue,
};

int blk_register_queue(struct gendisk *disk)
{
	int ret;
	struct device *dev = disk_to_dev(disk);
	struct request_queue *q = disk->queue;

	if (WARN_ON(!q))
		return -ENXIO;

	/*
	 * Initialization must be complete by now.  Finish the initial
	 * bypass from queue allocation.
	 */
	blk_queue_bypass_end(q);

	ret = blk_trace_init_sysfs(dev);
	if (ret)
		return ret;

	ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
	if (ret < 0) {
		blk_trace_remove_sysfs(dev);
		return ret;
	}

	kobject_uevent(&q->kobj, KOBJ_ADD);

	if (!q->request_fn)
		return 0;

	ret = elv_register_queue(q);
	if (ret) {
		kobject_uevent(&q->kobj, KOBJ_REMOVE);
		kobject_del(&q->kobj);
		blk_trace_remove_sysfs(dev);
		kobject_put(&dev->kobj);
		return ret;
	}

	return 0;
}

void blk_unregister_queue(struct gendisk *disk)
{
	struct request_queue *q = disk->queue;

	if (WARN_ON(!q))
		return;

	if (q->request_fn)
		elv_unregister_queue(q);

	kobject_uevent(&q->kobj, KOBJ_REMOVE);
	kobject_del(&q->kobj);
	blk_trace_remove_sysfs(disk_to_dev(disk));
	kobject_put(&disk_to_dev(disk)->kobj);
}
Commit	Line	Data
8324aa91 JA	1	/*
	2	* Functions related to sysfs handling
	3	*/
	4	#include <linux/kernel.h>
5a0e3ad6	5	#include <linux/slab.h>
8324aa91 JA	6	#include <linux/module.h>
	7	#include <linux/bio.h>
	8	#include <linux/blkdev.h>
	9	#include <linux/blktrace_api.h>
	10
	11	#include "blk.h"
5efd6113	12	#include "blk-cgroup.h"
8324aa91 JA	13
	14	struct queue_sysfs_entry {
	15	struct attribute attr;
	16	ssize_t (show)(struct request_queue , char *);
	17	ssize_t (store)(struct request_queue , const char *, size_t);
	18	};
	19
	20	static ssize_t
9cb308ce	21	queue_var_show(unsigned long var, char *page)
8324aa91	22	{
9cb308ce	23	return sprintf(page, "%lu\n", var);
8324aa91 JA	24	}
	25
	26	static ssize_t
	27	queue_var_store(unsigned long var, const char page, size_t count)
	28	{
b1f3b64d DR	29	int err;
	30	unsigned long v;
	31
	32	err = strict_strtoul(page, 10, &v);
	33	if (err \|\| v > UINT_MAX)
	34	return -EINVAL;
	35
	36	*var = v;
8324aa91	37
8324aa91 JA	38	return count;
	39	}
	40
	41	static ssize_t queue_requests_show(struct request_queue q, char page)
	42	{
	43	return queue_var_show(q->nr_requests, (page));
	44	}
	45
	46	static ssize_t
	47	queue_requests_store(struct request_queue q, const char page, size_t count)
	48	{
a051661c	49	struct request_list *rl;
8324aa91	50	unsigned long nr;
b8a9ae77 JA	51	int ret;
	52
	53	if (!q->request_fn)
	54	return -EINVAL;
	55
	56	ret = queue_var_store(&nr, page, count);
b1f3b64d DR	57	if (ret < 0)
	58	return ret;
	59
8324aa91 JA	60	if (nr < BLKDEV_MIN_RQ)
	61	nr = BLKDEV_MIN_RQ;
	62
	63	spin_lock_irq(q->queue_lock);
	64	q->nr_requests = nr;
	65	blk_queue_congestion_threshold(q);
	66
a051661c TH	67	/* congestion isn't cgroup aware and follows root blkcg for now */
	68	rl = &q->root_rl;
	69
1faa16d2 JA	70	if (rl->count[BLK_RW_SYNC] >= queue_congestion_on_threshold(q))
	71	blk_set_queue_congested(q, BLK_RW_SYNC);
	72	else if (rl->count[BLK_RW_SYNC] < queue_congestion_off_threshold(q))
	73	blk_clear_queue_congested(q, BLK_RW_SYNC);
	74
	75	if (rl->count[BLK_RW_ASYNC] >= queue_congestion_on_threshold(q))
	76	blk_set_queue_congested(q, BLK_RW_ASYNC);
	77	else if (rl->count[BLK_RW_ASYNC] < queue_congestion_off_threshold(q))
	78	blk_clear_queue_congested(q, BLK_RW_ASYNC);
	79
a051661c TH	80	blk_queue_for_each_rl(rl, q) {
	81	if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
	82	blk_set_rl_full(rl, BLK_RW_SYNC);
	83	} else {
	84	blk_clear_rl_full(rl, BLK_RW_SYNC);
	85	wake_up(&rl->wait[BLK_RW_SYNC]);
	86	}
	87
	88	if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
	89	blk_set_rl_full(rl, BLK_RW_ASYNC);
	90	} else {
	91	blk_clear_rl_full(rl, BLK_RW_ASYNC);
	92	wake_up(&rl->wait[BLK_RW_ASYNC]);
	93	}
8324aa91 JA	94	}
8324aa91 JA	95
8324aa91 JA	96	spin_unlock_irq(q->queue_lock);
	97	return ret;
	98	}
	99
	100	static ssize_t queue_ra_show(struct request_queue q, char page)
	101	{
9cb308ce XF	102	unsigned long ra_kb = q->backing_dev_info.ra_pages <<
9cb308ce XF	103	(PAGE_CACHE_SHIFT - 10);
8324aa91 JA	104
	105	return queue_var_show(ra_kb, (page));
	106	}
	107
	108	static ssize_t
	109	queue_ra_store(struct request_queue q, const char page, size_t count)
	110	{
	111	unsigned long ra_kb;
	112	ssize_t ret = queue_var_store(&ra_kb, page, count);
	113
b1f3b64d DR	114	if (ret < 0)
	115	return ret;
	116
8324aa91	117	q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
8324aa91 JA	118
	119	return ret;
	120	}
	121
	122	static ssize_t queue_max_sectors_show(struct request_queue q, char page)
	123	{
ae03bf63	124	int max_sectors_kb = queue_max_sectors(q) >> 1;
8324aa91 JA	125
	126	return queue_var_show(max_sectors_kb, (page));
	127	}
	128
c77a5710 MP	129	static ssize_t queue_max_segments_show(struct request_queue q, char page)
	130	{
	131	return queue_var_show(queue_max_segments(q), (page));
	132	}
	133
13f05c8d MP	134	static ssize_t queue_max_integrity_segments_show(struct request_queue q, char page)
	135	{
	136	return queue_var_show(q->limits.max_integrity_segments, (page));
	137	}
	138
c77a5710 MP	139	static ssize_t queue_max_segment_size_show(struct request_queue q, char page)
c77a5710 MP	140	{
e692cb66	141	if (blk_queue_cluster(q))
c77a5710 MP	142	return queue_var_show(queue_max_segment_size(q), (page));
	143
	144	return queue_var_show(PAGE_CACHE_SIZE, (page));
	145	}
	146
e1defc4f	147	static ssize_t queue_logical_block_size_show(struct request_queue q, char page)
e68b903c	148	{
e1defc4f	149	return queue_var_show(queue_logical_block_size(q), page);
e68b903c MP	150	}
e68b903c MP	151
c72758f3 MP	152	static ssize_t queue_physical_block_size_show(struct request_queue q, char page)
	153	{
	154	return queue_var_show(queue_physical_block_size(q), page);
	155	}
	156
	157	static ssize_t queue_io_min_show(struct request_queue q, char page)
	158	{
	159	return queue_var_show(queue_io_min(q), page);
	160	}
	161
	162	static ssize_t queue_io_opt_show(struct request_queue q, char page)
	163	{
	164	return queue_var_show(queue_io_opt(q), page);
e68b903c MP	165	}
e68b903c MP	166
86b37281 MP	167	static ssize_t queue_discard_granularity_show(struct request_queue q, char page)
	168	{
	169	return queue_var_show(q->limits.discard_granularity, page);
	170	}
	171
	172	static ssize_t queue_discard_max_show(struct request_queue q, char page)
	173	{
a934a00a MP	174	return sprintf(page, "%llu\n",
a934a00a MP	175	(unsigned long long)q->limits.max_discard_sectors << 9);
86b37281 MP	176	}
86b37281 MP	177
98262f27 MP	178	static ssize_t queue_discard_zeroes_data_show(struct request_queue q, char page)
	179	{
	180	return queue_var_show(queue_discard_zeroes_data(q), page);
	181	}
	182
4363ac7c MP	183	static ssize_t queue_write_same_max_show(struct request_queue q, char page)
	184	{
	185	return sprintf(page, "%llu\n",
	186	(unsigned long long)q->limits.max_write_same_sectors << 9);
	187	}
	188
	189
8324aa91 JA	190	static ssize_t
	191	queue_max_sectors_store(struct request_queue q, const char page, size_t count)
	192	{
	193	unsigned long max_sectors_kb,
ae03bf63	194	max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
8324aa91 JA	195	page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
	196	ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
	197
b1f3b64d DR	198	if (ret < 0)
	199	return ret;
	200
8324aa91 JA	201	if (max_sectors_kb > max_hw_sectors_kb \|\| max_sectors_kb < page_kb)
8324aa91 JA	202	return -EINVAL;
7c239517	203
8324aa91	204	spin_lock_irq(q->queue_lock);
c295fc05	205	q->limits.max_sectors = max_sectors_kb << 1;
8324aa91 JA	206	spin_unlock_irq(q->queue_lock);
	207
	208	return ret;
	209	}
	210
	211	static ssize_t queue_max_hw_sectors_show(struct request_queue q, char page)
	212	{
ae03bf63	213	int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
8324aa91 JA	214
	215	return queue_var_show(max_hw_sectors_kb, (page));
	216	}
	217
956bcb7c JA	218	#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
	219	static ssize_t \
	220	queue_show_##name(struct request_queue q, char page) \
	221	{ \
	222	int bit; \
	223	bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
	224	return queue_var_show(neg ? !bit : bit, page); \
	225	} \
	226	static ssize_t \
	227	queue_store_##name(struct request_queue q, const char page, size_t count) \
	228	{ \
	229	unsigned long val; \
	230	ssize_t ret; \
	231	ret = queue_var_store(&val, page, count); \
	232	if (neg) \
	233	val = !val; \
	234	\
	235	spin_lock_irq(q->queue_lock); \
	236	if (val) \
	237	queue_flag_set(QUEUE_FLAG_##flag, q); \
	238	else \
	239	queue_flag_clear(QUEUE_FLAG_##flag, q); \
	240	spin_unlock_irq(q->queue_lock); \
	241	return ret; \
1308835f BZ	242	}
1308835f BZ	243
956bcb7c JA	244	QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
	245	QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
	246	QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
	247	#undef QUEUE_SYSFS_BIT_FNS
1308835f	248
ac9fafa1 AB	249	static ssize_t queue_nomerges_show(struct request_queue q, char page)
ac9fafa1 AB	250	{
488991e2 AB	251	return queue_var_show((blk_queue_nomerges(q) << 1) \|
488991e2 AB	252	blk_queue_noxmerges(q), page);
ac9fafa1 AB	253	}
	254
	255	static ssize_t queue_nomerges_store(struct request_queue q, const char page,
	256	size_t count)
	257	{
	258	unsigned long nm;
	259	ssize_t ret = queue_var_store(&nm, page, count);
	260
b1f3b64d DR	261	if (ret < 0)
	262	return ret;
	263
bf0f9702	264	spin_lock_irq(q->queue_lock);
488991e2 AB	265	queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
	266	queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
	267	if (nm == 2)
bf0f9702	268	queue_flag_set(QUEUE_FLAG_NOMERGES, q);
488991e2 AB	269	else if (nm)
488991e2 AB	270	queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
bf0f9702	271	spin_unlock_irq(q->queue_lock);
1308835f	272
ac9fafa1 AB	273	return ret;
	274	}
	275
c7c22e4d JA	276	static ssize_t queue_rq_affinity_show(struct request_queue q, char page)
c7c22e4d JA	277	{
9cb308ce	278	bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
5757a6d7	279	bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
c7c22e4d	280
5757a6d7	281	return queue_var_show(set << force, page);
c7c22e4d JA	282	}
	283
	284	static ssize_t
	285	queue_rq_affinity_store(struct request_queue q, const char page, size_t count)
	286	{
	287	ssize_t ret = -EINVAL;
	288	#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
	289	unsigned long val;
	290
	291	ret = queue_var_store(&val, page, count);
b1f3b64d DR	292	if (ret < 0)
	293	return ret;
	294
c7c22e4d	295	spin_lock_irq(q->queue_lock);
e8037d49	296	if (val == 2) {
c7c22e4d	297	queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
e8037d49 ES	298	queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
	299	} else if (val == 1) {
	300	queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
	301	queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
	302	} else if (val == 0) {
5757a6d7 DW	303	queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
	304	queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
	305	}
c7c22e4d JA	306	spin_unlock_irq(q->queue_lock);
	307	#endif
	308	return ret;
	309	}
8324aa91 JA	310
	311	static struct queue_sysfs_entry queue_requests_entry = {
	312	.attr = {.name = "nr_requests", .mode = S_IRUGO \| S_IWUSR },
	313	.show = queue_requests_show,
	314	.store = queue_requests_store,
	315	};
	316
	317	static struct queue_sysfs_entry queue_ra_entry = {
	318	.attr = {.name = "read_ahead_kb", .mode = S_IRUGO \| S_IWUSR },
	319	.show = queue_ra_show,
	320	.store = queue_ra_store,
	321	};
	322
	323	static struct queue_sysfs_entry queue_max_sectors_entry = {
	324	.attr = {.name = "max_sectors_kb", .mode = S_IRUGO \| S_IWUSR },
	325	.show = queue_max_sectors_show,
	326	.store = queue_max_sectors_store,
	327	};
	328
	329	static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
	330	.attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
	331	.show = queue_max_hw_sectors_show,
	332	};
	333
c77a5710 MP	334	static struct queue_sysfs_entry queue_max_segments_entry = {
	335	.attr = {.name = "max_segments", .mode = S_IRUGO },
	336	.show = queue_max_segments_show,
	337	};
	338
13f05c8d MP	339	static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
	340	.attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
	341	.show = queue_max_integrity_segments_show,
	342	};
	343
c77a5710 MP	344	static struct queue_sysfs_entry queue_max_segment_size_entry = {
	345	.attr = {.name = "max_segment_size", .mode = S_IRUGO },
	346	.show = queue_max_segment_size_show,
	347	};
	348
8324aa91 JA	349	static struct queue_sysfs_entry queue_iosched_entry = {
	350	.attr = {.name = "scheduler", .mode = S_IRUGO \| S_IWUSR },
	351	.show = elv_iosched_show,
	352	.store = elv_iosched_store,
	353	};
	354
e68b903c MP	355	static struct queue_sysfs_entry queue_hw_sector_size_entry = {
e68b903c MP	356	.attr = {.name = "hw_sector_size", .mode = S_IRUGO },
e1defc4f MP	357	.show = queue_logical_block_size_show,
	358	};
	359
	360	static struct queue_sysfs_entry queue_logical_block_size_entry = {
	361	.attr = {.name = "logical_block_size", .mode = S_IRUGO },
	362	.show = queue_logical_block_size_show,
e68b903c MP	363	};
e68b903c MP	364
c72758f3 MP	365	static struct queue_sysfs_entry queue_physical_block_size_entry = {
	366	.attr = {.name = "physical_block_size", .mode = S_IRUGO },
	367	.show = queue_physical_block_size_show,
	368	};
	369
	370	static struct queue_sysfs_entry queue_io_min_entry = {
	371	.attr = {.name = "minimum_io_size", .mode = S_IRUGO },
	372	.show = queue_io_min_show,
	373	};
	374
	375	static struct queue_sysfs_entry queue_io_opt_entry = {
	376	.attr = {.name = "optimal_io_size", .mode = S_IRUGO },
	377	.show = queue_io_opt_show,
e68b903c MP	378	};
e68b903c MP	379
86b37281 MP	380	static struct queue_sysfs_entry queue_discard_granularity_entry = {
	381	.attr = {.name = "discard_granularity", .mode = S_IRUGO },
	382	.show = queue_discard_granularity_show,
	383	};
	384
	385	static struct queue_sysfs_entry queue_discard_max_entry = {
	386	.attr = {.name = "discard_max_bytes", .mode = S_IRUGO },
	387	.show = queue_discard_max_show,
	388	};
	389
98262f27 MP	390	static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
	391	.attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
	392	.show = queue_discard_zeroes_data_show,
	393	};
	394
4363ac7c MP	395	static struct queue_sysfs_entry queue_write_same_max_entry = {
	396	.attr = {.name = "write_same_max_bytes", .mode = S_IRUGO },
	397	.show = queue_write_same_max_show,
	398	};
	399
1308835f BZ	400	static struct queue_sysfs_entry queue_nonrot_entry = {
1308835f BZ	401	.attr = {.name = "rotational", .mode = S_IRUGO \| S_IWUSR },
956bcb7c JA	402	.show = queue_show_nonrot,
956bcb7c JA	403	.store = queue_store_nonrot,
1308835f BZ	404	};
1308835f BZ	405
ac9fafa1 AB	406	static struct queue_sysfs_entry queue_nomerges_entry = {
	407	.attr = {.name = "nomerges", .mode = S_IRUGO \| S_IWUSR },
	408	.show = queue_nomerges_show,
	409	.store = queue_nomerges_store,
	410	};
	411
c7c22e4d JA	412	static struct queue_sysfs_entry queue_rq_affinity_entry = {
	413	.attr = {.name = "rq_affinity", .mode = S_IRUGO \| S_IWUSR },
	414	.show = queue_rq_affinity_show,
	415	.store = queue_rq_affinity_store,
	416	};
	417
bc58ba94 JA	418	static struct queue_sysfs_entry queue_iostats_entry = {
bc58ba94 JA	419	.attr = {.name = "iostats", .mode = S_IRUGO \| S_IWUSR },
956bcb7c JA	420	.show = queue_show_iostats,
956bcb7c JA	421	.store = queue_store_iostats,
bc58ba94 JA	422	};
bc58ba94 JA	423
e2e1a148 JA	424	static struct queue_sysfs_entry queue_random_entry = {
e2e1a148 JA	425	.attr = {.name = "add_random", .mode = S_IRUGO \| S_IWUSR },
956bcb7c JA	426	.show = queue_show_random,
956bcb7c JA	427	.store = queue_store_random,
e2e1a148 JA	428	};
e2e1a148 JA	429
8324aa91 JA	430	static struct attribute *default_attrs[] = {
	431	&queue_requests_entry.attr,
	432	&queue_ra_entry.attr,
	433	&queue_max_hw_sectors_entry.attr,
	434	&queue_max_sectors_entry.attr,
c77a5710	435	&queue_max_segments_entry.attr,
13f05c8d	436	&queue_max_integrity_segments_entry.attr,
c77a5710	437	&queue_max_segment_size_entry.attr,
8324aa91	438	&queue_iosched_entry.attr,
e68b903c	439	&queue_hw_sector_size_entry.attr,
e1defc4f	440	&queue_logical_block_size_entry.attr,
c72758f3 MP	441	&queue_physical_block_size_entry.attr,
	442	&queue_io_min_entry.attr,
	443	&queue_io_opt_entry.attr,
86b37281 MP	444	&queue_discard_granularity_entry.attr,
86b37281 MP	445	&queue_discard_max_entry.attr,
98262f27	446	&queue_discard_zeroes_data_entry.attr,
4363ac7c	447	&queue_write_same_max_entry.attr,
1308835f	448	&queue_nonrot_entry.attr,
ac9fafa1	449	&queue_nomerges_entry.attr,
c7c22e4d	450	&queue_rq_affinity_entry.attr,
bc58ba94	451	&queue_iostats_entry.attr,
e2e1a148	452	&queue_random_entry.attr,
8324aa91 JA	453	NULL,
	454	};
	455
	456	#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
	457
	458	static ssize_t
	459	queue_attr_show(struct kobject kobj, struct attribute attr, char *page)
	460	{
	461	struct queue_sysfs_entry *entry = to_queue(attr);
	462	struct request_queue *q =
	463	container_of(kobj, struct request_queue, kobj);
	464	ssize_t res;
	465
	466	if (!entry->show)
	467	return -EIO;
	468	mutex_lock(&q->sysfs_lock);
34f6055c	469	if (blk_queue_dead(q)) {
8324aa91 JA	470	mutex_unlock(&q->sysfs_lock);
	471	return -ENOENT;
	472	}
	473	res = entry->show(q, page);
	474	mutex_unlock(&q->sysfs_lock);
	475	return res;
	476	}
	477
	478	static ssize_t
	479	queue_attr_store(struct kobject kobj, struct attribute attr,
	480	const char *page, size_t length)
	481	{
	482	struct queue_sysfs_entry *entry = to_queue(attr);
6728cb0e	483	struct request_queue *q;
8324aa91 JA	484	ssize_t res;
	485
	486	if (!entry->store)
	487	return -EIO;
6728cb0e JA	488
6728cb0e JA	489	q = container_of(kobj, struct request_queue, kobj);
8324aa91	490	mutex_lock(&q->sysfs_lock);
34f6055c	491	if (blk_queue_dead(q)) {
8324aa91 JA	492	mutex_unlock(&q->sysfs_lock);
	493	return -ENOENT;
	494	}
	495	res = entry->store(q, page, length);
	496	mutex_unlock(&q->sysfs_lock);
	497	return res;
	498	}
	499
	500	/**
499337bb AM	501	* blk_release_queue: - release a &struct request_queue when it is no longer needed
499337bb AM	502	* @kobj: the kobj belonging to the request queue to be released
8324aa91 JA	503	*
8324aa91 JA	504	* Description:
499337bb	505	* blk_release_queue is the pair to blk_init_queue() or
8324aa91 JA	506	* blk_queue_make_request(). It should be called when a request queue is
	507	* being released; typically when a block device is being de-registered.
	508	* Currently, its primary task it to free all the &struct request
	509	* structures that were allocated to the queue and the queue itself.
	510	*
	511	* Caveat:
	512	* Hopefully the low level driver will have finished any
	513	* outstanding requests first...
	514	**/
	515	static void blk_release_queue(struct kobject *kobj)
	516	{
	517	struct request_queue *q =
	518	container_of(kobj, struct request_queue, kobj);
8324aa91 JA	519
	520	blk_sync_queue(q);
	521
e8989fae TH	522	blkcg_exit_queue(q);
e8989fae TH	523
7e5a8794 TH	524	if (q->elevator) {
	525	spin_lock_irq(q->queue_lock);
	526	ioc_clear_queue(q);
	527	spin_unlock_irq(q->queue_lock);
777eb1bf	528	elevator_exit(q->elevator);
7e5a8794	529	}
777eb1bf	530
a051661c	531	blk_exit_rl(&q->root_rl);
8324aa91 JA	532
	533	if (q->queue_tags)
	534	__blk_queue_free_tags(q);
	535
	536	blk_trace_shutdown(q);
	537
	538	bdi_destroy(&q->backing_dev_info);
a73f730d TH	539
a73f730d TH	540	ida_simple_remove(&blk_queue_ida, q->id);
8324aa91 JA	541	kmem_cache_free(blk_requestq_cachep, q);
	542	}
	543
52cf25d0	544	static const struct sysfs_ops queue_sysfs_ops = {
8324aa91 JA	545	.show = queue_attr_show,
	546	.store = queue_attr_store,
	547	};
	548
	549	struct kobj_type blk_queue_ktype = {
	550	.sysfs_ops = &queue_sysfs_ops,
	551	.default_attrs = default_attrs,
	552	.release = blk_release_queue,
	553	};
	554
	555	int blk_register_queue(struct gendisk *disk)
	556	{
	557	int ret;
1d54ad6d	558	struct device *dev = disk_to_dev(disk);
8324aa91 JA	559	struct request_queue *q = disk->queue;
8324aa91 JA	560
fb199746	561	if (WARN_ON(!q))
8324aa91 JA	562	return -ENXIO;
8324aa91 JA	563
749fefe6 TH	564	/*
	565	* Initialization must be complete by now. Finish the initial
	566	* bypass from queue allocation.
	567	*/
	568	blk_queue_bypass_end(q);
	569
1d54ad6d LZ	570	ret = blk_trace_init_sysfs(dev);
	571	if (ret)
	572	return ret;
	573
c9059598	574	ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
ed5302d3 LY	575	if (ret < 0) {
ed5302d3 LY	576	blk_trace_remove_sysfs(dev);
8324aa91	577	return ret;
ed5302d3	578	}
8324aa91 JA	579
	580	kobject_uevent(&q->kobj, KOBJ_ADD);
	581
cd43e26f MP	582	if (!q->request_fn)
	583	return 0;
	584
8324aa91 JA	585	ret = elv_register_queue(q);
	586	if (ret) {
	587	kobject_uevent(&q->kobj, KOBJ_REMOVE);
	588	kobject_del(&q->kobj);
80656b67	589	blk_trace_remove_sysfs(dev);
c87ffbb8	590	kobject_put(&dev->kobj);
8324aa91 JA	591	return ret;
	592	}
	593
	594	return 0;
	595	}
	596
	597	void blk_unregister_queue(struct gendisk *disk)
	598	{
	599	struct request_queue *q = disk->queue;
	600
fb199746 AM	601	if (WARN_ON(!q))
	602	return;
	603
48c0d4d4	604	if (q->request_fn)
8324aa91 JA	605	elv_unregister_queue(q);
8324aa91 JA	606
48c0d4d4 ZK	607	kobject_uevent(&q->kobj, KOBJ_REMOVE);
	608	kobject_del(&q->kobj);
	609	blk_trace_remove_sysfs(disk_to_dev(disk));
	610	kobject_put(&disk_to_dev(disk)->kobj);
8324aa91	611	}