amd iommu: Refactoring iommu ring buffer definition

Introduce struct ring_buffer to represent iommu cmd buffer, event log and ppr log

Signed-off-by: Wei Wang <wei.wang2@amd.com>
Committed-by: Jan Beulich <jbeulich@suse.com>

1 files changed, 32 insertions, 4 deletions

diff --git a/xen/include/asm-x86/amd-iommu.h b/xen/include/asm-x86/amd-iommu.h
index 876d9b998a..77afabae42 100644
--- a/xen/include/asm-x86/amd-iommu.h
+++ b/xen/include/asm-x86/amd-iommu.h
@@ -30,12 +30,42 @@
 
 extern struct list_head amd_iommu_head;
 
+#pragma pack(1)
+typedef struct event_entry
+{
+    uint32_t data[4];
+} event_entry_t;
+
+typedef struct ppr_entry
+{
+    uint32_t data[4];
+} ppr_entry_t;
+
+typedef struct cmd_entry
+{
+    uint32_t data[4];
+} cmd_entry_t;
+
+typedef struct dev_entry
+{
+    uint32_t data[8];
+} dev_entry_t;
+#pragma pack()
+
 struct table_struct {
     void *buffer;
     unsigned long entries;
     unsigned long alloc_size;
 };
 
+struct ring_buffer {
+    void *buffer;
+    unsigned long entries;
+    unsigned long alloc_size;
+    uint32_t tail;
+    uint32_t head;
+};
+
 typedef struct iommu_cap {
     uint32_t header;                    /* offset 00h */
     uint32_t base_low;                  /* offset 04h */
@@ -60,10 +90,8 @@ struct amd_iommu {
     unsigned long mmio_base_phys;
 
     struct table_struct dev_table;
-    struct table_struct cmd_buffer;
-    u32 cmd_buffer_tail;
-    struct table_struct event_log;
-    u32 event_log_head;
+    struct ring_buffer cmd_buffer;
+    struct ring_buffer event_log;
 
     int exclusion_enable;
     int exclusion_allow_all;