amd-iommu: introduce aperture_range structure

This is a preperation for extended address allocator.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 22 insertions, 10 deletions

diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index 95c8cd9d22b5..4c64c9bc6839 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -195,6 +195,8 @@
 #define PD_DEFAULT_MASK		(1UL << 1) /* domain is a default dma_ops
 					      domain for an IOMMU */
 
+#define APERTURE_RANGE_SIZE	(128 * 1024 * 1024)
+
 /*
  * This structure contains generic data for  IOMMU protection domains
  * independent of their use.
@@ -210,6 +212,24 @@ struct protection_domain {
 };
 
 /*
+ * For dynamic growth the aperture size is split into ranges of 128MB of
+ * DMA address space each. This struct represents one such range.
+ */
+struct aperture_range {
+
+	/* address allocation bitmap */
+	unsigned long *bitmap;
+
+	/*
+	 * Array of PTE pages for the aperture. In this array we save all the
+	 * leaf pages of the domain page table used for the aperture. This way
+	 * we don't need to walk the page table to find a specific PTE. We can
+	 * just calculate its address in constant time.
+	 */
+	u64 *pte_pages[64];
+};
+
+/*
  * Data container for a dma_ops specific protection domain
  */
 struct dma_ops_domain {
@@ -224,16 +244,8 @@ struct dma_ops_domain {
 	/* address we start to search for free addresses */
 	unsigned long next_bit;
 
-	/* address allocation bitmap */
-	unsigned long *bitmap;
-
-	/*
-	 * Array of PTE pages for the aperture. In this array we save all the
-	 * leaf pages of the domain page table used for the aperture. This way
-	 * we don't need to walk the page table to find a specific PTE. We can
-	 * just calculate its address in constant time.
-	 */
-	u64 **pte_pages;
+	/* address space relevant data */
+	struct aperture_range aperture;
 
 	/* This will be set to true when TLB needs to be flushed */
 	bool need_flush;