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 <shaohua.li@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>

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 <shaohua.li@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Shaohua Li · Len Brown
1 parent a23cf14b16
Showing 2 changed files with 5 additions and 0 deletions Side-by-side Diff
drivers/pci/pci-acpi.c
include/acpi/actbl.h
@@ -317,6 +317,10 @@
 {
 	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;
@@ -276,6 +276,7 @@
  
 #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
...	...	@@ -317,6 +317,10 @@
317	317	{
318	318	int ret;
319	319
	320	+ if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
	321	+ printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	322	+ pci_no_msi();
	323	+ }
320	324	ret = register_acpi_bus_type(&acpi_pci_bus);
321	325	if (ret)
322	326	return 0;
...	...	@@ -276,6 +276,7 @@
276	276
277	277	#define BAF_LEGACY_DEVICES 0x0001
278	278	#define BAF_8042_KEYBOARD_CONTROLLER 0x0002
	279	+#define BAF_MSI_NOT_SUPPORTED 0x0008
279	280
280	281	#define FADT2_REVISION_ID 3
281	282	#define FADT2_MINUS_REVISION_ID 2