Commit 054a5fba authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
Browse files

libata: track SLEEP state and issue SRST to wake it up 



ATA devices in SLEEP mode don't respond to any commands.  SRST is
necessary to wake it up.  Till now, when a command is issued to a
device in SLEEP mode, the command times out, which makes EH reset the
device and retry the command after that, causing a long delay.

This patch makes libata track SLEEP state and issue SRST automatically
if a command is about to be issued to a device in SLEEP.

Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Cc: Bruce Allen <ballen@gravity.phys.uwm.edu>
Cc: Andrew Paprocki <andrew@ishiboo.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 4dbfa39b

drivers/ata/libata-core.c

+12 −0
Original line number Diff line number Diff line
@@ -5630,6 +5630,10 @@ void ata_qc_complete(struct ata_queued_cmd *qc) 
			ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;

			ata_port_schedule_eh(ap);

			break;



		case ATA_CMD_SLEEP:

			dev->flags |= ATA_DFLAG_SLEEPING;

			break;

		}



		__ata_qc_complete(qc);
@@ -5769,6 +5773,14 @@ void ata_qc_issue(struct ata_queued_cmd *qc) 
		qc->flags &= ~ATA_QCFLAG_DMAMAP;

	}



	/* if device is sleeping, schedule softreset and abort the link */

	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {

		link->eh_info.action |= ATA_EH_SOFTRESET;

		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");

		ata_link_abort(link);

		return;

	}



	ap->ops->qc_prep(qc);



	qc->err_mask |= ap->ops->qc_issue(qc);

drivers/ata/libata-eh.c

+3 −1
Original line number Diff line number Diff line
@@ -2208,9 +2208,11 @@ int ata_eh_reset(struct ata_link *link, int classify, 
		ata_link_for_each_dev(dev, link) {

			/* After the reset, the device state is PIO 0

			 * and the controller state is undefined.

			 * Record the mode.

			 * Reset also wakes up drives from sleeping

			 * mode.

			 */

			dev->pio_mode = XFER_PIO_0;

			dev->flags &= ~ATA_DFLAG_SLEEPING;



			if (ata_link_offline(link))

				continue;

include/linux/ata.h

+1 −0
Original line number Diff line number Diff line
@@ -180,6 +180,7 @@ enum { 
	ATA_CMD_VERIFY_EXT	= 0x42,

	ATA_CMD_STANDBYNOW1	= 0xE0,

	ATA_CMD_IDLEIMMEDIATE	= 0xE1,

	ATA_CMD_SLEEP		= 0xE6,

	ATA_CMD_INIT_DEV_PARAMS	= 0x91,

	ATA_CMD_READ_NATIVE_MAX	= 0xF8,

	ATA_CMD_READ_NATIVE_MAX_EXT = 0x27,

include/linux/libata.h

+1 −0
Original line number Diff line number Diff line
@@ -138,6 +138,7 @@ enum { 
	ATA_DFLAG_PIO		= (1 << 12), /* device limited to PIO mode */

	ATA_DFLAG_NCQ_OFF	= (1 << 13), /* device limited to non-NCQ mode */

	ATA_DFLAG_SPUNDOWN	= (1 << 14), /* XXX: for spindown_compat */

	ATA_DFLAG_SLEEPING	= (1 << 15), /* device is sleeping */

	ATA_DFLAG_INIT_MASK	= (1 << 16) - 1,



	ATA_DFLAG_DETACH	= (1 << 16),

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