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authorJens Axboe <jens.axboe@oracle.com>2008-08-27 15:23:18 +0200
committerJeff Garzik <jgarzik@redhat.com>2008-10-31 01:45:06 -0400
commit9ce8e3073d9cfd6f859c22a25441db41b85cbf6e (patch)
tree81ddeb3d7203677b541b132b4ed8a909137d7ccf
parentb9d5b89b487517cbd4cb4702da829e07ef9e4432 (diff)
libata: add whitelist for devices with known good pata-sata bridges
libata currently imposes a UDMA5 max transfer rate and 200 sector max transfer size for SATA devices that sit behind a pata-sata bridge. Lots of devices have known good bridges that don't need this limit applied. The MTRON SSD disks are such devices. Transfer rates are increased by 20-30% with the restriction removed. So add a "blacklist" entry for the MTRON devices, with a flag indicating that the bridge is known good. Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/ata/libata-core.c7
-rw-r--r--include/linux/libata.h1
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 8824c8da3f2..82af7011f2d 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2158,6 +2158,10 @@ retry:
static inline u8 ata_dev_knobble(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
+
+ if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
+ return 0;
+
return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
}
@@ -4062,6 +4066,9 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
{ "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
{ "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
+ /* Devices that do not need bridging limits applied */
+ { "MTRON MSP-SATA*", NULL, ATA_HORKAGE_BRIDGE_OK, },
+
/* End Marker */
{ }
};
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 507f53ef803..f5441edee55 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -372,6 +372,7 @@ enum {
ATA_HORKAGE_IPM = (1 << 7), /* Link PM problems */
ATA_HORKAGE_IVB = (1 << 8), /* cbl det validity bit bugs */
ATA_HORKAGE_STUCK_ERR = (1 << 9), /* stuck ERR on next PACKET */
+ ATA_HORKAGE_BRIDGE_OK = (1 << 10), /* no bridge limits */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */