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

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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: Tejun Heo <htejun@gmail.com>
Cc: Bruce Allen <ballen@gravity.phys.uwm.edu>
Cc: Andrew Paprocki <andrew@ishiboo.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-10-25 18:30:36 +09:00 committed by Jeff Garzik
parent 4dbfa39b6c
commit 054a5fbace
4 changed files with 17 additions and 1 deletions
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12
drivers/ata/libata-core.c
View file

@ -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);

4
drivers/ata/libata-eh.c
View file

@ -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;

1
include/linux/ata.h
View file

@ -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,

1
include/linux/libata.h
View file

@ -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),