AMD IOMMU: add event buffer allocation

This patch adds the allocation of a event buffer for each AMD IOMMU in
the system. The hardware will log events like device page faults or
other errors to this buffer once this is enabled.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-x86/amd_iommu_types.h b/include/asm-x86/amd_iommu_types.h
index dcc472445ffd..8b8cd0c60b3c 100644
--- a/include/asm-x86/amd_iommu_types.h
+++ b/include/asm-x86/amd_iommu_types.h
@@ -116,6 +116,10 @@
 #define MMIO_CMD_SIZE_SHIFT 56
 #define MMIO_CMD_SIZE_512 (0x9ULL << MMIO_CMD_SIZE_SHIFT)
 
+/* constants for event buffer handling */
+#define EVT_BUFFER_SIZE         8192 /* 512 entries */
+#define EVT_LEN_MASK            (0x9ULL << 56)
+
 #define PAGE_MODE_1_LEVEL 0x01
 #define PAGE_MODE_2_LEVEL 0x02
 #define PAGE_MODE_3_LEVEL 0x03
@@ -243,6 +247,11 @@ struct amd_iommu {
         /* size of command buffer */
         u32 cmd_buf_size;
 
+        /* event buffer virtual address */
+        u8 *evt_buf;
+        /* size of event buffer */
+        u32 evt_buf_size;
+
         /* if one, we need to send a completion wait command */
         int need_sync;