diff options
authorTony Vroon <>2009-08-06 00:50:09 +0100
committerJeff Garzik <>2009-08-12 06:20:29 -0400
commit51c8949950647afeeb897e08dd75ad99078adb50 (patch)
parent7831387bda72af3059be48d39846d3eb6d8ce2f6 (diff)
sata_nv: MSI support, disabled by default
At least the nVidia MCP55 controller quite happily supports MSI. This adds an option to use it. It is disabled by default. As per feedback by Robert Hancock, it will honour the user request as the kernel will not enable MSI where the controller or the specific system configuration do not support it. Signed-off-by: Tony Vroon <> Cc: Robert Hancock <> Signed-off-by: Jeff Garzik <>
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index b2d11f300c3..86a40582999 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -602,6 +602,7 @@ MODULE_VERSION(DRV_VERSION);
static int adma_enabled;
static int swncq_enabled = 1;
+static int msi_enabled;
static void nv_adma_register_mode(struct ata_port *ap)
@@ -2459,6 +2460,11 @@ static int nv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
} else if (type == SWNCQ)
+ if (msi_enabled) {
+ dev_printk(KERN_NOTICE, &pdev->dev, "Using MSI\n");
+ pci_enable_msi(pdev);
+ }
return ata_host_activate(host, pdev->irq, ipriv->irq_handler,
IRQF_SHARED, ipriv->sht);
@@ -2558,4 +2564,6 @@ module_param_named(adma, adma_enabled, bool, 0444);
MODULE_PARM_DESC(adma, "Enable use of ADMA (Default: false)");
module_param_named(swncq, swncq_enabled, bool, 0444);
MODULE_PARM_DESC(swncq, "Enable use of SWNCQ (Default: true)");
+module_param_named(msi, msi_enabled, bool, 0444);
+MODULE_PARM_DESC(msi, "Enable use of MSI (Default: false)");