x86/gart: Disable GART explicitly before initialization

If we boot into a crash-kernel the gart might still be
enabled and its caches might be dirty. This can result in
undefined behavior later. Fix it by explicitly disabling the
gart hardware before initialization and flushing the caches
after enablement.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index f3af115a573a..0ae24d9b44b3 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -564,6 +564,9 @@ static void enable_gart_translations(void)
 
                 enable_gart_translation(dev, __pa(agp_gatt_table));
         }
+
+        /* Flush the GART-TLB to remove stale entries */
+        k8_flush_garts();
 }
 
 /*