x86, AMD IOMMU: use status bit instead of memory write-back for completion wait

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/asm-x86/amd_iommu_types.h b/include/asm-x86/amd_iommu_types.h
index 22aa58ca1991..32543229db76 100644
--- a/include/asm-x86/amd_iommu_types.h
+++ b/include/asm-x86/amd_iommu_types.h
@@ -69,6 +69,9 @@
 #define MMIO_EVT_TAIL_OFFSET    0x2018
 #define MMIO_STATUS_OFFSET      0x2020
 
+/* MMIO status bits */
+#define MMIO_STATUS_COM_WAIT_INT_MASK   0x04
+
 /* feature control bits */
 #define CONTROL_IOMMU_EN        0x00ULL
 #define CONTROL_HT_TUN_EN       0x01ULL
@@ -89,6 +92,7 @@
 #define CMD_INV_IOMMU_PAGES     0x03
 
 #define CMD_COMPL_WAIT_STORE_MASK       0x01
+#define CMD_COMPL_WAIT_INT_MASK         0x02
 #define CMD_INV_IOMMU_PAGES_SIZE_MASK   0x01
 #define CMD_INV_IOMMU_PAGES_PDE_MASK    0x02