x86/amd-iommu: Add an index field to struct amd_iommu
This patch adds an index field to struct amd_iommu which can
be used to lookup it up in an array. This index will be used
in struct protection_domain to keep track which protection
domain has devices behind which IOMMU.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index df5e9c8..ab3e7bf 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -25,6 +25,11 @@
#include <linux/spinlock.h>
/*
+ * Maximum number of IOMMUs supported
+ */
+#define MAX_IOMMUS 32
+
+/*
* some size calculation constants
*/
#define DEV_TABLE_ENTRY_SIZE 32
@@ -291,6 +296,9 @@
struct amd_iommu {
struct list_head list;
+ /* Index within the IOMMU array */
+ int index;
+
/* locks the accesses to the hardware */
spinlock_t lock;
@@ -357,6 +365,15 @@
extern struct list_head amd_iommu_list;
/*
+ * Array with pointers to each IOMMU struct
+ * The indices are referenced in the protection domains
+ */
+extern struct amd_iommu *amd_iommus[MAX_IOMMUS];
+
+/* Number of IOMMUs present in the system */
+extern int amd_iommus_present;
+
+/*
* Structure defining one entry in the device table
*/
struct dev_table_entry {