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libata: implement ATA_DFLAG_DUBIOUS_XFER 

ATA_DFLAG_DUBIOUS_XFER is set whenever data transfer speed or method
changes and gets cleared when data transfer command succeeds in the
newly configured transfer mode.

This will be used to improve speed down logic.

Signed-off-by: Tejun Heo <htejun@gmail.com<
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-11-27 19:28:58 +09:00 committed by Jeff Garzik
parent 663f99b86a
commit 00115e0f5b
3 changed files with 53 additions and 2 deletions
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19
drivers/ata/libata-core.c
View File

@ -5797,6 +5797,22 @@ static void fill_result_tf(struct ata_queued_cmd *qc)
ap->ops->tf_read(ap, &qc->result_tf);
}
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
struct ata_device *dev = qc->dev;
if (ata_tag_internal(qc->tag))
return;
if (ata_is_nodata(qc->tf.protocol))
return;
if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
return;
dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}
/**
* ata_qc_complete - Complete an active ATA command
* @qc: Command to complete
@ -5868,6 +5884,9 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
break;
}
if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
ata_verify_xfer(qc);
__ata_qc_complete(qc);
} else {
if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)

33
drivers/ata/libata-eh.c
View File

@ -456,9 +456,20 @@ void ata_scsi_error(struct Scsi_Host *host)
spin_lock_irqsave(ap->lock, flags);
__ata_port_for_each_link(link, ap) {
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev;
memset(&link->eh_context, 0, sizeof(link->eh_context));
link->eh_context.i = link->eh_info;
memset(&link->eh_info, 0, sizeof(link->eh_info));
ata_link_for_each_dev(dev, link) {
int devno = dev->devno;
ehc->saved_xfer_mode[devno] = dev->xfer_mode;
if (ata_ncq_enabled(dev))
ehc->saved_ncq_enabled |= 1 << devno;
}
}
ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
@ -2376,11 +2387,27 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
{
struct ata_port *ap = link->ap;
struct ata_device *dev;
int rc;
/* has private set_mode? */
if (ap->ops->set_mode)
return ap->ops->set_mode(link, r_failed_dev);
return ata_do_set_mode(link, r_failed_dev);
rc = ap->ops->set_mode(link, r_failed_dev);
else
rc = ata_do_set_mode(link, r_failed_dev);
/* if transfer mode has changed, set DUBIOUS_XFER on device */
ata_link_for_each_dev(dev, link) {
struct ata_eh_context *ehc = &link->eh_context;
u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
if (dev->xfer_mode != saved_xfer_mode ||
ata_ncq_enabled(dev) != saved_ncq)
dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
}
return rc;
}
static int ata_link_nr_enabled(struct ata_link *link)
@ -2441,6 +2468,8 @@ static int ata_eh_schedule_probe(struct ata_device *dev)
ata_dev_init(dev);
ehc->did_probe_mask |= (1 << dev->devno);
ehc->i.action |= ATA_EH_SOFTRESET;
ehc->saved_xfer_mode[dev->devno] = 0;
ehc->saved_ncq_enabled &= ~(1 << dev->devno);
return 1;
}

3
include/linux/libata.h
View File

@ -143,6 +143,7 @@ enum {
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_DUBIOUS_XFER = (1 << 16), /* data transfer not verified */
ATA_DFLAG_INIT_MASK = (1 << 24) - 1,
ATA_DFLAG_DETACH = (1 << 24),
@ -560,6 +561,8 @@ struct ata_eh_context {
int tries[ATA_MAX_DEVICES];
unsigned int classes[ATA_MAX_DEVICES];
unsigned int did_probe_mask;
unsigned int saved_ncq_enabled;
u8 saved_xfer_mode[ATA_MAX_DEVICES];
};
struct ata_acpi_drive