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authorJeff Garzik <jgarzik@pobox.com>2006-01-27 16:50:27 -0500
committerJeff Garzik <jgarzik@pobox.com>2006-01-27 16:50:27 -0500
commit51e9f2ff83df6b1c81c5c44f4486c68ed87aa20e (patch)
treee6f54581c145ad1849bc1b2e4c3dbd2ccead405b /drivers/scsi
parent3ee68c4af3fd7228c1be63254b9f884614f9ebb2 (diff)
[libata sata_sil] implement 'slow_down' module parameter
On occasion, a user will submit a patch that enables the "mod15write" quirk for their device. Enabling this quirk has the effect of clamping all ATA commands to no more than 15 sectors. The intended use of this quirk is to stop the controller from generating FIS's of unusual size ("but Wesley, what about the FOUS's?"), which in turn works around problems in a <list> of hard drives. One side effect of this quirk is greatly decreased performance. Users often enable the mod15write quirk to fix various system, power, chip, and/or driver problems. For a few rare problematic cases, enabling this has cured lockups or data corruption. Rather than add bogus listings to the mod15write quirk list (I get a patch every month doing such), we add a 'slow_down' module parameter. This allows users to employ a performance sledgehammer in the hopes of curing a problem. It defaults to off (0), of course.
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/sata_sil.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/scsi/sata_sil.c b/drivers/scsi/sata_sil.c
index b017f85e6d6..17f74d3c10e 100644
--- a/drivers/scsi/sata_sil.c
+++ b/drivers/scsi/sata_sil.c
@@ -231,6 +231,10 @@ MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, sil_pci_tbl);
MODULE_VERSION(DRV_VERSION);
+static int slow_down = 0;
+module_param(slow_down, int, 0444);
+MODULE_PARM_DESC(slow_down, "Sledgehammer used to work around random problems, by limiting commands to 15 sectors (0=off, 1=on)");
+
static unsigned char sil_get_device_cache_line(struct pci_dev *pdev)
{
@@ -354,8 +358,10 @@ static void sil_dev_config(struct ata_port *ap, struct ata_device *dev)
}
/* limit requests to 15 sectors */
- if ((ap->flags & SIL_FLAG_MOD15WRITE) && (quirks & SIL_QUIRK_MOD15WRITE)) {
- printk(KERN_INFO "ata%u(%u): applying Seagate errata fix\n",
+ if (slow_down ||
+ ((ap->flags & SIL_FLAG_MOD15WRITE) &&
+ (quirks & SIL_QUIRK_MOD15WRITE))) {
+ printk(KERN_INFO "ata%u(%u): applying Seagate errata fix (mod15write workaround)\n",
ap->id, dev->devno);
ap->host->max_sectors = 15;
ap->host->hostt->max_sectors = 15;