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sata_nv: MSI support, disabled by default

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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 <tony@linx.net>
Cc: Robert Hancock <hancockrwd@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tony Vroon 2009-08-06 00:50:09 +01:00 committed by Jeff Garzik
parent 7831387bda
commit 51c8949950
1 changed files with 8 additions and 0 deletions
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8
drivers/ata/sata_nv.c
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@ -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)
nv_swncq_host_init(host);
if (msi_enabled) {
dev_printk(KERN_NOTICE, &pdev->dev, "Using MSI\n");
pci_enable_msi(pdev);
}
pci_set_master(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)");