2 * Copyright (c) 2006, Intel Corporation.
4 * This file is released under the GPLv2.
6 * Copyright (C) 2006-2008 Intel Corporation
7 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/rbtree.h>
17 #include <linux/dma-mapping.h>
19 /* IO virtual address start page frame number */
20 #define IOVA_START_PFN (1)
25 unsigned long pfn_hi; /* IOMMU dish out addr hi */
26 unsigned long pfn_lo; /* IOMMU dish out addr lo */
29 /* holds all the iova translations for a domain */
31 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
32 struct rb_root rbroot; /* iova domain rbtree root */
33 struct rb_node *cached32_node; /* Save last alloced node */
34 unsigned long dma_32bit_pfn;
37 static inline unsigned long iova_size(struct iova *iova)
39 return iova->pfn_hi - iova->pfn_lo + 1;
42 int iommu_iova_cache_init(void);
43 void iommu_iova_cache_destroy(void);
45 struct iova *alloc_iova_mem(void);
46 void free_iova_mem(struct iova *iova);
47 void free_iova(struct iova_domain *iovad, unsigned long pfn);
48 void __free_iova(struct iova_domain *iovad, struct iova *iova);
49 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
50 unsigned long limit_pfn,
52 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
53 unsigned long pfn_hi);
54 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
55 void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
56 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
57 void put_iova_domain(struct iova_domain *iovad);
58 struct iova *split_and_remove_iova(struct iova_domain *iovad,
59 struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);