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libata: add whitelist for devices with known good pata-sata bridges

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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>
This commit is contained in:
Jens Axboe 2008-08-27 15:23:18 +02:00 committed by Jeff Garzik
parent b9d5b89b48
commit 9ce8e3073d
2 changed files with 8 additions and 0 deletions
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7
drivers/ata/libata-core.c
View file

@ -2158,6 +2158,10 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
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 */
{ }
};

1
include/linux/libata.h
View file

@ -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 */