[linux-2.6-block.git] / drivers / ide / ide-park.c

#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/jiffies.h>
#include <linux/blkdev.h>

DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);

static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
{
	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
	struct request_queue *q = drive->queue;
	struct request *rq;
	int rc;

	timeout += jiffies;
	spin_lock_irq(&hwgroup->lock);
	if (drive->dev_flags & IDE_DFLAG_PARKED) {
		int reset_timer = time_before(timeout, drive->sleep);

		drive->sleep = timeout;
		wake_up_all(&ide_park_wq);
		if (reset_timer && hwgroup->sleeping &&
		    del_timer(&hwgroup->timer)) {
			hwgroup->sleeping = 0;
			ide_unlock_hwgroup(hwgroup);
			blk_start_queueing(q);
		}
		spin_unlock_irq(&hwgroup->lock);
		return;
	}
	spin_unlock_irq(&hwgroup->lock);

	rq = blk_get_request(q, READ, __GFP_WAIT);
	rq->cmd[0] = REQ_PARK_HEADS;
	rq->cmd_len = 1;
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->special = &timeout;
	rc = blk_execute_rq(q, NULL, rq, 1);
	blk_put_request(rq);
	if (rc)
		goto out;

	/*
	 * Make sure that *some* command is sent to the drive after the
	 * timeout has expired, so power management will be reenabled.
	 */
	rq = blk_get_request(q, READ, GFP_NOWAIT);
	if (unlikely(!rq))
		goto out;

	rq->cmd[0] = REQ_UNPARK_HEADS;
	rq->cmd_len = 1;
	rq->cmd_type = REQ_TYPE_SPECIAL;
	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);

out:
	return;
}

ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
		      char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
	unsigned long now;
	unsigned int msecs;

	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
		return -EOPNOTSUPP;

	spin_lock_irq(&hwgroup->lock);
	now = jiffies;
	if (drive->dev_flags & IDE_DFLAG_PARKED &&
	    time_after(drive->sleep, now))
		msecs = jiffies_to_msecs(drive->sleep - now);
	else
		msecs = 0;
	spin_unlock_irq(&hwgroup->lock);

	return snprintf(buf, 20, "%u\n", msecs);
}

ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
		       const char *buf, size_t len)
{
#define MAX_PARK_TIMEOUT 30000
	ide_drive_t *drive = to_ide_device(dev);
	long int input;
	int rc;

	rc = strict_strtol(buf, 10, &input);
	if (rc || input < -2)
		return -EINVAL;
	if (input > MAX_PARK_TIMEOUT) {
		input = MAX_PARK_TIMEOUT;
		rc = -EOVERFLOW;
	}

	mutex_lock(&ide_setting_mtx);
	if (input >= 0) {
		if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
			rc = -EOPNOTSUPP;
		else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
			issue_park_cmd(drive, msecs_to_jiffies(input));
	} else {
		if (drive->media == ide_disk)
			switch (input) {
			case -1:
				drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
				break;
			case -2:
				drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
				break;
			}
		else
			rc = -EOPNOTSUPP;
	}
	mutex_unlock(&ide_setting_mtx);

	return rc ? rc : len;
}
Commit	Line	Data
4abdc6ee EO	1	#include <linux/kernel.h>
	2	#include <linux/ide.h>
	3	#include <linux/jiffies.h>
	4	#include <linux/blkdev.h>
	5
	6	DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
	7
	8	static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
	9	{
2a2ca6a9	10	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
4abdc6ee EO	11	struct request_queue *q = drive->queue;
	12	struct request *rq;
	13	int rc;
	14
	15	timeout += jiffies;
2a2ca6a9	16	spin_lock_irq(&hwgroup->lock);
4abdc6ee	17	if (drive->dev_flags & IDE_DFLAG_PARKED) {
2a2ca6a9	18	int reset_timer = time_before(timeout, drive->sleep);
4abdc6ee	19
4abdc6ee EO	20	drive->sleep = timeout;
	21	wake_up_all(&ide_park_wq);
	22	if (reset_timer && hwgroup->sleeping &&
	23	del_timer(&hwgroup->timer)) {
	24	hwgroup->sleeping = 0;
631de370	25	ide_unlock_hwgroup(hwgroup);
4abdc6ee EO	26	blk_start_queueing(q);
4abdc6ee EO	27	}
2a2ca6a9	28	spin_unlock_irq(&hwgroup->lock);
4abdc6ee EO	29	return;
4abdc6ee EO	30	}
2a2ca6a9	31	spin_unlock_irq(&hwgroup->lock);
4abdc6ee EO	32
	33	rq = blk_get_request(q, READ, __GFP_WAIT);
	34	rq->cmd[0] = REQ_PARK_HEADS;
	35	rq->cmd_len = 1;
	36	rq->cmd_type = REQ_TYPE_SPECIAL;
	37	rq->special = &timeout;
	38	rc = blk_execute_rq(q, NULL, rq, 1);
	39	blk_put_request(rq);
	40	if (rc)
	41	goto out;
	42
	43	/*
	44	* Make sure that some command is sent to the drive after the
	45	* timeout has expired, so power management will be reenabled.
	46	*/
	47	rq = blk_get_request(q, READ, GFP_NOWAIT);
	48	if (unlikely(!rq))
	49	goto out;
	50
	51	rq->cmd[0] = REQ_UNPARK_HEADS;
	52	rq->cmd_len = 1;
	53	rq->cmd_type = REQ_TYPE_SPECIAL;
	54	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
	55
	56	out:
	57	return;
	58	}
	59
	60	ssize_t ide_park_show(struct device dev, struct device_attribute attr,
	61	char *buf)
	62	{
	63	ide_drive_t *drive = to_ide_device(dev);
2a2ca6a9	64	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
4abdc6ee EO	65	unsigned long now;
	66	unsigned int msecs;
	67
	68	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	69	return -EOPNOTSUPP;
	70
2a2ca6a9	71	spin_lock_irq(&hwgroup->lock);
4abdc6ee EO	72	now = jiffies;
	73	if (drive->dev_flags & IDE_DFLAG_PARKED &&
	74	time_after(drive->sleep, now))
	75	msecs = jiffies_to_msecs(drive->sleep - now);
	76	else
	77	msecs = 0;
2a2ca6a9	78	spin_unlock_irq(&hwgroup->lock);
4abdc6ee EO	79
	80	return snprintf(buf, 20, "%u\n", msecs);
	81	}
	82
	83	ssize_t ide_park_store(struct device dev, struct device_attribute attr,
	84	const char *buf, size_t len)
	85	{
	86	#define MAX_PARK_TIMEOUT 30000
	87	ide_drive_t *drive = to_ide_device(dev);
	88	long int input;
	89	int rc;
	90
	91	rc = strict_strtol(buf, 10, &input);
	92	if (rc \|\| input < -2)
	93	return -EINVAL;
	94	if (input > MAX_PARK_TIMEOUT) {
	95	input = MAX_PARK_TIMEOUT;
	96	rc = -EOVERFLOW;
	97	}
	98
	99	mutex_lock(&ide_setting_mtx);
	100	if (input >= 0) {
	101	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	102	rc = -EOPNOTSUPP;
	103	else if (input \|\| drive->dev_flags & IDE_DFLAG_PARKED)
	104	issue_park_cmd(drive, msecs_to_jiffies(input));
	105	} else {
	106	if (drive->media == ide_disk)
	107	switch (input) {
	108	case -1:
	109	drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
	110	break;
	111	case -2:
	112	drive->dev_flags \|= IDE_DFLAG_NO_UNLOAD;
	113	break;
	114	}
	115	else
	116	rc = -EOPNOTSUPP;
	117	}
	118	mutex_unlock(&ide_setting_mtx);
	119
	120	return rc ? rc : len;
	121	}