x86: add pci=check_enable_amd_mmconf and dmi check

so will disable that feature by default, and only enable that via
pci=check_enable_amd_mmconf or for system match with dmi table.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/pci/pci.h b/arch/x86/pci/pci.h
index c8b89a832c66..8ef86b5c37c8 100644
--- a/arch/x86/pci/pci.h
+++ b/arch/x86/pci/pci.h
@@ -26,6 +26,7 @@
 #define PCI_ASSIGN_ALL_BUSSES   0x4000
 #define PCI_CAN_SKIP_ISA_ALIGN  0x8000
 #define PCI_USE__CRS            0x10000
+#define PCI_CHECK_ENABLE_AMD_MMCONF     0x20000
 
 extern unsigned int pci_probe;
 extern unsigned long pirq_table_addr;