Commit | Line | Data |
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55716d26 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
f8de50eb KA |
2 | /* |
3 | * Copyright (c) 2006, Intel Corporation. | |
4 | * | |
98bcef56 | 5 | * Copyright (C) 2006-2008 Intel Corporation |
6 | * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
f8de50eb KA |
7 | */ |
8 | ||
9 | #ifndef _IOVA_H_ | |
10 | #define _IOVA_H_ | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/rbtree.h> | |
aade40b6 | 15 | #include <linux/dma-mapping.h> |
f8de50eb | 16 | |
f8de50eb KA |
17 | /* iova structure */ |
18 | struct iova { | |
19 | struct rb_node node; | |
9257b4a2 OP |
20 | unsigned long pfn_hi; /* Highest allocated pfn */ |
21 | unsigned long pfn_lo; /* Lowest allocated pfn */ | |
22 | }; | |
23 | ||
9257b4a2 | 24 | |
32e92d9f | 25 | struct iova_rcache; |
f8de50eb KA |
26 | |
27 | /* holds all the iova translations for a domain */ | |
28 | struct iova_domain { | |
f8de50eb KA |
29 | spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ |
30 | struct rb_root rbroot; /* iova domain rbtree root */ | |
e60aa7b5 RM |
31 | struct rb_node *cached_node; /* Save last alloced node */ |
32 | struct rb_node *cached32_node; /* Save last 32-bit alloced node */ | |
0fb5fe87 | 33 | unsigned long granule; /* pfn granularity for this domain */ |
1b722500 | 34 | unsigned long start_pfn; /* Lower limit for this domain */ |
f661197e | 35 | unsigned long dma_32bit_pfn; |
bee60e94 | 36 | unsigned long max32_alloc_size; /* Size of last failed allocation */ |
bb68b2fb | 37 | struct iova anchor; /* rbtree lookup anchor */ |
42f87e71 | 38 | |
32e92d9f | 39 | struct iova_rcache *rcaches; |
f598a497 | 40 | struct hlist_node cpuhp_dead; |
f8de50eb KA |
41 | }; |
42 | ||
a156ef99 JL |
43 | static inline unsigned long iova_size(struct iova *iova) |
44 | { | |
45 | return iova->pfn_hi - iova->pfn_lo + 1; | |
46 | } | |
47 | ||
0fb5fe87 RM |
48 | static inline unsigned long iova_shift(struct iova_domain *iovad) |
49 | { | |
50 | return __ffs(iovad->granule); | |
51 | } | |
52 | ||
53 | static inline unsigned long iova_mask(struct iova_domain *iovad) | |
54 | { | |
55 | return iovad->granule - 1; | |
56 | } | |
57 | ||
58 | static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) | |
59 | { | |
60 | return iova & iova_mask(iovad); | |
61 | } | |
62 | ||
63 | static inline size_t iova_align(struct iova_domain *iovad, size_t size) | |
64 | { | |
65 | return ALIGN(size, iovad->granule); | |
66 | } | |
67 | ||
68 | static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) | |
69 | { | |
70 | return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); | |
71 | } | |
72 | ||
73 | static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) | |
74 | { | |
75 | return iova >> iova_shift(iovad); | |
76 | } | |
77 | ||
b4d8c7ae | 78 | #if IS_ENABLED(CONFIG_IOMMU_IOVA) |
ae1ff3d6 SA |
79 | int iova_cache_get(void); |
80 | void iova_cache_put(void); | |
85b45456 | 81 | |
f8de50eb KA |
82 | void free_iova(struct iova_domain *iovad, unsigned long pfn); |
83 | void __free_iova(struct iova_domain *iovad, struct iova *iova); | |
84 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, | |
f76aec76 KA |
85 | unsigned long limit_pfn, |
86 | bool size_aligned); | |
9257b4a2 OP |
87 | void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, |
88 | unsigned long size); | |
89 | unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, | |
538d5b33 | 90 | unsigned long limit_pfn, bool flush_rcache); |
f8de50eb KA |
91 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
92 | unsigned long pfn_hi); | |
0fb5fe87 | 93 | void init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
aa3ac946 | 94 | unsigned long start_pfn); |
32e92d9f | 95 | int iova_domain_init_rcaches(struct iova_domain *iovad); |
f8de50eb KA |
96 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
97 | void put_iova_domain(struct iova_domain *iovad); | |
21aff52a TR |
98 | #else |
99 | static inline int iova_cache_get(void) | |
100 | { | |
101 | return -ENOTSUPP; | |
102 | } | |
103 | ||
104 | static inline void iova_cache_put(void) | |
105 | { | |
106 | } | |
107 | ||
21aff52a TR |
108 | static inline void free_iova(struct iova_domain *iovad, unsigned long pfn) |
109 | { | |
110 | } | |
111 | ||
112 | static inline void __free_iova(struct iova_domain *iovad, struct iova *iova) | |
113 | { | |
114 | } | |
115 | ||
116 | static inline struct iova *alloc_iova(struct iova_domain *iovad, | |
117 | unsigned long size, | |
118 | unsigned long limit_pfn, | |
119 | bool size_aligned) | |
120 | { | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | static inline void free_iova_fast(struct iova_domain *iovad, | |
125 | unsigned long pfn, | |
126 | unsigned long size) | |
127 | { | |
128 | } | |
129 | ||
130 | static inline unsigned long alloc_iova_fast(struct iova_domain *iovad, | |
131 | unsigned long size, | |
538d5b33 TN |
132 | unsigned long limit_pfn, |
133 | bool flush_rcache) | |
21aff52a TR |
134 | { |
135 | return 0; | |
136 | } | |
137 | ||
138 | static inline struct iova *reserve_iova(struct iova_domain *iovad, | |
139 | unsigned long pfn_lo, | |
140 | unsigned long pfn_hi) | |
141 | { | |
142 | return NULL; | |
143 | } | |
144 | ||
21aff52a TR |
145 | static inline void init_iova_domain(struct iova_domain *iovad, |
146 | unsigned long granule, | |
aa3ac946 | 147 | unsigned long start_pfn) |
21aff52a TR |
148 | { |
149 | } | |
150 | ||
151 | static inline struct iova *find_iova(struct iova_domain *iovad, | |
152 | unsigned long pfn) | |
153 | { | |
154 | return NULL; | |
155 | } | |
156 | ||
157 | static inline void put_iova_domain(struct iova_domain *iovad) | |
158 | { | |
159 | } | |
160 | ||
21aff52a | 161 | #endif |
f8de50eb KA |
162 | |
163 | #endif |