1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/pci/iova.h b/drivers/pci/iova.h
new file mode 100644
index 000000000000..ae3028d5a941
--- /dev/null
+++ b/drivers/pci/iova.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2006, Intel Corporation.
+ *
+ * This file is released under the GPLv2.
+ *
+ * Copyright (C) 2006 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
+ *
+ */
+
+#ifndef _IOVA_H_
+#define _IOVA_H_
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/rbtree.h>
+#include <linux/dma-mapping.h>
+
+/*
+ * We need a fixed PAGE_SIZE of 4K irrespective of
+ * arch PAGE_SIZE for IOMMU page tables.
+ */
+#define PAGE_SHIFT_4K		(12)
+#define PAGE_SIZE_4K		(1UL << PAGE_SHIFT_4K)
+#define PAGE_MASK_4K		(((u64)-1) << PAGE_SHIFT_4K)
+#define PAGE_ALIGN_4K(addr)	(((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
+
+/* IO virtual address start page frame number */
+#define IOVA_START_PFN		(1)
+
+#define IOVA_PFN(addr)		((addr) >> PAGE_SHIFT_4K)
+#define DMA_32BIT_PFN	IOVA_PFN(DMA_32BIT_MASK)
+#define DMA_64BIT_PFN	IOVA_PFN(DMA_64BIT_MASK)
+
+/* iova structure */
+struct iova {
+	struct rb_node	node;
+	unsigned long	pfn_hi; /* IOMMU dish out addr hi */
+	unsigned long	pfn_lo; /* IOMMU dish out addr lo */
+};
+
+/* holds all the iova translations for a domain */
+struct iova_domain {
+	spinlock_t	iova_alloc_lock;/* Lock to protect iova  allocation */
+	spinlock_t	iova_rbtree_lock; /* Lock to protect update of rbtree */
+	struct rb_root	rbroot;		/* iova domain rbtree root */
+	struct rb_node	*cached32_node; /* Save last alloced node */
+};
+
+struct iova *alloc_iova_mem(void);
+void free_iova_mem(struct iova *iova);
+void free_iova(struct iova_domain *iovad, unsigned long pfn);
+void __free_iova(struct iova_domain *iovad, struct iova *iova);
+struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
+	unsigned long limit_pfn,
+	bool size_aligned);
+struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
+	unsigned long pfn_hi);
+void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
+void init_iova_domain(struct iova_domain *iovad);
+struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
+void put_iova_domain(struct iova_domain *iovad);
+
+#endif