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>
diff --git a/include/asm-x86/amd_iommu_types.h b/include/asm-x86/amd_iommu_types.h
index dcc4724..8b8cd0c 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 @@
/* 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;