From: Shaohua Li Date: Wed, 25 Apr 2007 03:05:12 +0000 (+0800) Subject: ACPI: Disable MSI on request of FADT X-Git-Tag: v2.6.22-rc1~1112^2~4^2~9 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8993aff8b4de0317c6e081802ca5c86c449fef2;p=linux-2.6 ACPI: Disable MSI on request of FADT The ACPI spec defines the bit and Microsoft uses it, so Linux must use it too. Signed-off-by: Shaohua Li Signed-off-by: Len Brown --- diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index a064f36a08..b5ac810404 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -317,6 +317,10 @@ static int __init acpi_pci_init(void) { int ret; + if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) { + printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); + pci_no_msi(); + } ret = register_acpi_bus_type(&acpi_pci_bus); if (ret) return 0; diff --git a/include/acpi/actbl.h b/include/acpi/actbl.h index 09469e7db6..955adfb8d6 100644 --- a/include/acpi/actbl.h +++ b/include/acpi/actbl.h @@ -276,6 +276,7 @@ enum acpi_prefered_pm_profiles { #define BAF_LEGACY_DEVICES 0x0001 #define BAF_8042_KEYBOARD_CONTROLLER 0x0002 +#define BAF_MSI_NOT_SUPPORTED 0x0008 #define FADT2_REVISION_ID 3 #define FADT2_MINUS_REVISION_ID 2