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authorTejun Heo <htejun@gmail.com>2007-11-27 19:28:58 +0900
committerJeff Garzik <jeff@garzik.org>2008-01-23 05:24:11 -0500
commit00115e0f5bc3bfdf3f3855ad89c8895f10458f92 (patch)
tree5f174c1d68e1ec0770fefdb40b813f321a838095 /drivers/ata
parent663f99b86ac7d4c0eed8c239638da0ea8849288b (diff)
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>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-core.c19
-rw-r--r--drivers/ata/libata-eh.c33
2 files changed, 50 insertions, 2 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 86c10cc751e..124b6f111cc 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -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)
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 7d766ada7a5..359a5ace847 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -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;
}