[mirror_ubuntu-artful-kernel.git] / drivers / ide / ide-park.c

#include <linux/kernel.h>
#include <linux/gfp.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_hwif_t *hwif = drive->hwif;
	struct request_queue *q = drive->queue;
	struct request *rq;
	int rc;

	timeout += jiffies;
	spin_lock_irq(&hwif->lock);
	if (drive->dev_flags & IDE_DFLAG_PARKED) {
		int reset_timer = time_before(timeout, drive->sleep);
		int start_queue = 0;

		drive->sleep = timeout;
		wake_up_all(&ide_park_wq);
		if (reset_timer && del_timer(&hwif->timer))
			start_queue = 1;
		spin_unlock_irq(&hwif->lock);

		if (start_queue)
			blk_run_queue(q);
		return;
	}
	spin_unlock_irq(&hwif->lock);

	rq = blk_get_request(q, REQ_OP_DRV_IN, __GFP_RECLAIM);
	scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
	scsi_req(rq)->cmd_len = 1;
	ide_req(rq)->type = ATA_PRIV_MISC;
	rq->special = &timeout;
	blk_execute_rq(q, NULL, rq, 1);
	rc = scsi_req(rq)->result ? -EIO : 0;
	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, REQ_OP_DRV_IN, GFP_NOWAIT);
	if (IS_ERR(rq))
		goto out;

	scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
	scsi_req(rq)->cmd_len = 1;
	ide_req(rq)->type = ATA_PRIV_MISC;
	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);

out:
	return;
}

ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
{
	struct ide_cmd cmd;
	struct ide_taskfile *tf = &cmd.tf;

	memset(&cmd, 0, sizeof(cmd));
	if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
		drive->sleep = *(unsigned long *)rq->special;
		drive->dev_flags |= IDE_DFLAG_SLEEPING;
		tf->command = ATA_CMD_IDLEIMMEDIATE;
		tf->feature = 0x44;
		tf->lbal = 0x4c;
		tf->lbam = 0x4e;
		tf->lbah = 0x55;
		cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
		cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
	} else		/* cmd == REQ_UNPARK_HEADS */
		tf->command = ATA_CMD_CHK_POWER;

	cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
	cmd.protocol = ATA_PROT_NODATA;

	cmd.rq = rq;

	return do_rw_taskfile(drive, &cmd);
}

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

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

	spin_lock_irq(&hwif->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(&hwif->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 = kstrtol(buf, 10, &input);
	if (rc)
		return rc;
	if (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	1	#include <linux/kernel.h>
5a0e3ad6	2	#include <linux/gfp.h>
4abdc6ee EO	3	#include <linux/ide.h>
	4	#include <linux/jiffies.h>
	5	#include <linux/blkdev.h>
	6
	7	DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
	8
	9	static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
	10	{
b65fac32	11	ide_hwif_t *hwif = drive->hwif;
4abdc6ee EO	12	struct request_queue *q = drive->queue;
	13	struct request *rq;
	14	int rc;
	15
	16	timeout += jiffies;
b65fac32	17	spin_lock_irq(&hwif->lock);
4abdc6ee	18	if (drive->dev_flags & IDE_DFLAG_PARKED) {
2a2ca6a9	19	int reset_timer = time_before(timeout, drive->sleep);
201bffa4	20	int start_queue = 0;
4abdc6ee	21
4abdc6ee EO	22	drive->sleep = timeout;
4abdc6ee EO	23	wake_up_all(&ide_park_wq);
b65fac32	24	if (reset_timer && del_timer(&hwif->timer))
201bffa4	25	start_queue = 1;
b65fac32	26	spin_unlock_irq(&hwif->lock);
201bffa4	27
853280a4 TH	28	if (start_queue)
853280a4 TH	29	blk_run_queue(q);
4abdc6ee EO	30	return;
4abdc6ee EO	31	}
b65fac32	32	spin_unlock_irq(&hwif->lock);
4abdc6ee	33
aebf526b	34	rq = blk_get_request(q, REQ_OP_DRV_IN, __GFP_RECLAIM);
82ed4db4 CH	35	scsi_req(rq)->cmd[0] = REQ_PARK_HEADS;
82ed4db4 CH	36	scsi_req(rq)->cmd_len = 1;
2f5a8e80	37	ide_req(rq)->type = ATA_PRIV_MISC;
4abdc6ee	38	rq->special = &timeout;
b7819b92	39	blk_execute_rq(q, NULL, rq, 1);
17d5363b	40	rc = scsi_req(rq)->result ? -EIO : 0;
4abdc6ee EO	41	blk_put_request(rq);
	42	if (rc)
	43	goto out;
	44
	45	/*
	46	* Make sure that some command is sent to the drive after the
	47	* timeout has expired, so power management will be reenabled.
	48	*/
aebf526b	49	rq = blk_get_request(q, REQ_OP_DRV_IN, GFP_NOWAIT);
a492f075	50	if (IS_ERR(rq))
4abdc6ee EO	51	goto out;
4abdc6ee EO	52
82ed4db4 CH	53	scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS;
82ed4db4 CH	54	scsi_req(rq)->cmd_len = 1;
2f5a8e80	55	ide_req(rq)->type = ATA_PRIV_MISC;
7eaceacc	56	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
4abdc6ee EO	57
	58	out:
	59	return;
	60	}
	61
c4e66c36 BZ	62	ide_startstop_t ide_do_park_unpark(ide_drive_t drive, struct request rq)
c4e66c36 BZ	63	{
22aa4b32 BZ	64	struct ide_cmd cmd;
22aa4b32 BZ	65	struct ide_taskfile *tf = &cmd.tf;
c4e66c36	66
22aa4b32	67	memset(&cmd, 0, sizeof(cmd));
82ed4db4	68	if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) {
c4e66c36 BZ	69	drive->sleep = (unsigned long )rq->special;
	70	drive->dev_flags \|= IDE_DFLAG_SLEEPING;
	71	tf->command = ATA_CMD_IDLEIMMEDIATE;
	72	tf->feature = 0x44;
	73	tf->lbal = 0x4c;
	74	tf->lbam = 0x4e;
	75	tf->lbah = 0x55;
60f85019 SS	76	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
60f85019 SS	77	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
c4e66c36 BZ	78	} else /* cmd == REQ_UNPARK_HEADS */
	79	tf->command = ATA_CMD_CHK_POWER;
	80
d364c7f5	81	cmd.tf_flags \|= IDE_TFLAG_CUSTOM_HANDLER;
0dfb991c BZ	82	cmd.protocol = ATA_PROT_NODATA;
0dfb991c BZ	83
22aa4b32	84	cmd.rq = rq;
22aa4b32 BZ	85
22aa4b32 BZ	86	return do_rw_taskfile(drive, &cmd);
c4e66c36 BZ	87	}
c4e66c36 BZ	88
4abdc6ee EO	89	ssize_t ide_park_show(struct device dev, struct device_attribute attr,
	90	char *buf)
	91	{
	92	ide_drive_t *drive = to_ide_device(dev);
b65fac32	93	ide_hwif_t *hwif = drive->hwif;
4abdc6ee EO	94	unsigned long now;
	95	unsigned int msecs;
	96
	97	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	98	return -EOPNOTSUPP;
	99
b65fac32	100	spin_lock_irq(&hwif->lock);
4abdc6ee EO	101	now = jiffies;
	102	if (drive->dev_flags & IDE_DFLAG_PARKED &&
	103	time_after(drive->sleep, now))
	104	msecs = jiffies_to_msecs(drive->sleep - now);
	105	else
	106	msecs = 0;
b65fac32	107	spin_unlock_irq(&hwif->lock);
4abdc6ee EO	108
	109	return snprintf(buf, 20, "%u\n", msecs);
	110	}
	111
	112	ssize_t ide_park_store(struct device dev, struct device_attribute attr,
	113	const char *buf, size_t len)
	114	{
	115	#define MAX_PARK_TIMEOUT 30000
	116	ide_drive_t *drive = to_ide_device(dev);
	117	long int input;
	118	int rc;
	119
79c8fa0b JH	120	rc = kstrtol(buf, 10, &input);
	121	if (rc)
	122	return rc;
	123	if (input < -2)
4abdc6ee EO	124	return -EINVAL;
	125	if (input > MAX_PARK_TIMEOUT) {
	126	input = MAX_PARK_TIMEOUT;
	127	rc = -EOVERFLOW;
	128	}
	129
	130	mutex_lock(&ide_setting_mtx);
	131	if (input >= 0) {
	132	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
	133	rc = -EOPNOTSUPP;
	134	else if (input \|\| drive->dev_flags & IDE_DFLAG_PARKED)
	135	issue_park_cmd(drive, msecs_to_jiffies(input));
	136	} else {
	137	if (drive->media == ide_disk)
	138	switch (input) {
	139	case -1:
	140	drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
	141	break;
	142	case -2:
	143	drive->dev_flags \|= IDE_DFLAG_NO_UNLOAD;
	144	break;
	145	}
	146	else
	147	rc = -EOPNOTSUPP;
	148	}
	149	mutex_unlock(&ide_setting_mtx);
	150
	151	return rc ? rc : len;
	152	}