x86: Work around mmio config space quirk on AMD Fam10h

Some broken devices have been discovered to require %al/%ax/%eax registers
for MMIO config space accesses.  Modify mmconfig.c to use these registers
explicitly (rather than modify the global readb/writeb/etc inlines).

AK: also changed i386 to always use eax
AK: moved change to extended space probing to different patch
AK: reworked with inlines according to Linus' requirements.
AK: improve comments.

Signed-off-by: dean gaudet <dean@arctic.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 65d82736987e..4095e4d66a1d 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -66,13 +66,13 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 
         switch (len) {
         case 1:
-                *value = readb(addr + reg);
+                *value = mmio_config_readb(addr + reg);
                 break;
         case 2:
-                *value = readw(addr + reg);
+                *value = mmio_config_readw(addr + reg);
                 break;
         case 4:
-                *value = readl(addr + reg);
+                *value = mmio_config_readl(addr + reg);
                 break;
         }
 
@@ -94,13 +94,13 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 
         switch (len) {
         case 1:
-                writeb(value, addr + reg);
+                mmio_config_writeb(addr + reg, value);
                 break;
         case 2:
-                writew(value, addr + reg);
+                mmio_config_writew(addr + reg, value);
                 break;
         case 4:
-                writel(value, addr + reg);
+                mmio_config_writel(addr + reg, value);
                 break;
         }