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Commit | Line | Data |
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f8de50eb KA |
1 | /* |
2 | * Copyright (c) 2006, Intel Corporation. | |
3 | * | |
4 | * This file is released under the GPLv2. | |
5 | * | |
98bcef56 | 6 | * Copyright (C) 2006-2008 Intel Corporation |
7 | * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
f8de50eb KA |
8 | * |
9 | */ | |
10 | ||
11 | #ifndef _IOVA_H_ | |
12 | #define _IOVA_H_ | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/rbtree.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | ||
f8de50eb KA |
19 | /* iova structure */ |
20 | struct iova { | |
21 | struct rb_node node; | |
22 | unsigned long pfn_hi; /* IOMMU dish out addr hi */ | |
23 | unsigned long pfn_lo; /* IOMMU dish out addr lo */ | |
24 | }; | |
25 | ||
26 | /* holds all the iova translations for a domain */ | |
27 | struct iova_domain { | |
f8de50eb KA |
28 | spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ |
29 | struct rb_root rbroot; /* iova domain rbtree root */ | |
30 | struct rb_node *cached32_node; /* Save last alloced node */ | |
0fb5fe87 | 31 | unsigned long granule; /* pfn granularity for this domain */ |
1b722500 | 32 | unsigned long start_pfn; /* Lower limit for this domain */ |
f661197e | 33 | unsigned long dma_32bit_pfn; |
f8de50eb KA |
34 | }; |
35 | ||
a156ef99 JL |
36 | static inline unsigned long iova_size(struct iova *iova) |
37 | { | |
38 | return iova->pfn_hi - iova->pfn_lo + 1; | |
39 | } | |
40 | ||
0fb5fe87 RM |
41 | static inline unsigned long iova_shift(struct iova_domain *iovad) |
42 | { | |
43 | return __ffs(iovad->granule); | |
44 | } | |
45 | ||
46 | static inline unsigned long iova_mask(struct iova_domain *iovad) | |
47 | { | |
48 | return iovad->granule - 1; | |
49 | } | |
50 | ||
51 | static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) | |
52 | { | |
53 | return iova & iova_mask(iovad); | |
54 | } | |
55 | ||
56 | static inline size_t iova_align(struct iova_domain *iovad, size_t size) | |
57 | { | |
58 | return ALIGN(size, iovad->granule); | |
59 | } | |
60 | ||
61 | static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) | |
62 | { | |
63 | return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); | |
64 | } | |
65 | ||
66 | static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) | |
67 | { | |
68 | return iova >> iova_shift(iovad); | |
69 | } | |
70 | ||
ae1ff3d6 SA |
71 | int iova_cache_get(void); |
72 | void iova_cache_put(void); | |
85b45456 | 73 | |
f8de50eb KA |
74 | struct iova *alloc_iova_mem(void); |
75 | void free_iova_mem(struct iova *iova); | |
76 | void free_iova(struct iova_domain *iovad, unsigned long pfn); | |
77 | void __free_iova(struct iova_domain *iovad, struct iova *iova); | |
78 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, | |
f76aec76 KA |
79 | unsigned long limit_pfn, |
80 | bool size_aligned); | |
f8de50eb KA |
81 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
82 | unsigned long pfn_hi); | |
83 | void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); | |
0fb5fe87 RM |
84 | void init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
85 | unsigned long start_pfn, unsigned long pfn_32bit); | |
f8de50eb KA |
86 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
87 | void put_iova_domain(struct iova_domain *iovad); | |
75f05569 JL |
88 | struct iova *split_and_remove_iova(struct iova_domain *iovad, |
89 | struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi); | |
f8de50eb KA |
90 | |
91 | #endif |