1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 6fadbb9bc180..29bf2d8176e2 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -57,6 +57,39 @@
 #define DMA_32BIT_PFN           IOVA_PFN(DMA_32BIT_MASK)
 #define DMA_64BIT_PFN           IOVA_PFN(DMA_64BIT_MASK)
 
+/*
+ * 0: Present
+ * 1-11: Reserved
+ * 12-63: Context Ptr (12 - (haw-1))
+ * 64-127: Reserved
+ */
+struct root_entry {
+        u64     val;
+        u64     rsvd1;
+};
+#define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
+static inline bool root_present(struct root_entry *root)
+{
+        return (root->val & 1);
+}
+static inline void set_root_present(struct root_entry *root)
+{
+        root->val |= 1;
+}
+static inline void set_root_value(struct root_entry *root, unsigned long value)
+{
+        root->val |= value & VTD_PAGE_MASK;
+}
+
+static inline struct context_entry *
+get_context_addr_from_root(struct root_entry *root)
+{
+        return (struct context_entry *)
+                (root_present(root)?phys_to_virt(
+                root->val & VTD_PAGE_MASK) :
+                NULL);
+}
+
 static void flush_unmaps_timeout(unsigned long data);
 
 DEFINE_TIMER(unmap_timer,  flush_unmaps_timeout, 0, 0);