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; | |
9257b4a2 OP |
22 | unsigned long pfn_hi; /* Highest allocated pfn */ |
23 | unsigned long pfn_lo; /* Lowest allocated pfn */ | |
24 | }; | |
25 | ||
26 | struct iova_magazine; | |
27 | struct iova_cpu_rcache; | |
28 | ||
29 | #define IOVA_RANGE_CACHE_MAX_SIZE 6 /* log of max cached IOVA range size (in pages) */ | |
30 | #define MAX_GLOBAL_MAGS 32 /* magazines per bin */ | |
31 | ||
32 | struct iova_rcache { | |
33 | spinlock_t lock; | |
34 | unsigned long depot_size; | |
35 | struct iova_magazine *depot[MAX_GLOBAL_MAGS]; | |
36 | struct iova_cpu_rcache __percpu *cpu_rcaches; | |
f8de50eb KA |
37 | }; |
38 | ||
39 | /* holds all the iova translations for a domain */ | |
40 | struct iova_domain { | |
f8de50eb KA |
41 | spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ |
42 | struct rb_root rbroot; /* iova domain rbtree root */ | |
43 | struct rb_node *cached32_node; /* Save last alloced node */ | |
0fb5fe87 | 44 | unsigned long granule; /* pfn granularity for this domain */ |
1b722500 | 45 | unsigned long start_pfn; /* Lower limit for this domain */ |
f661197e | 46 | unsigned long dma_32bit_pfn; |
9257b4a2 | 47 | struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */ |
f8de50eb KA |
48 | }; |
49 | ||
a156ef99 JL |
50 | static inline unsigned long iova_size(struct iova *iova) |
51 | { | |
52 | return iova->pfn_hi - iova->pfn_lo + 1; | |
53 | } | |
54 | ||
0fb5fe87 RM |
55 | static inline unsigned long iova_shift(struct iova_domain *iovad) |
56 | { | |
57 | return __ffs(iovad->granule); | |
58 | } | |
59 | ||
60 | static inline unsigned long iova_mask(struct iova_domain *iovad) | |
61 | { | |
62 | return iovad->granule - 1; | |
63 | } | |
64 | ||
65 | static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) | |
66 | { | |
67 | return iova & iova_mask(iovad); | |
68 | } | |
69 | ||
70 | static inline size_t iova_align(struct iova_domain *iovad, size_t size) | |
71 | { | |
72 | return ALIGN(size, iovad->granule); | |
73 | } | |
74 | ||
75 | static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) | |
76 | { | |
77 | return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); | |
78 | } | |
79 | ||
80 | static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) | |
81 | { | |
82 | return iova >> iova_shift(iovad); | |
83 | } | |
84 | ||
b4d8c7ae | 85 | #if IS_ENABLED(CONFIG_IOMMU_IOVA) |
ae1ff3d6 SA |
86 | int iova_cache_get(void); |
87 | void iova_cache_put(void); | |
85b45456 | 88 | |
f8de50eb KA |
89 | struct iova *alloc_iova_mem(void); |
90 | void free_iova_mem(struct iova *iova); | |
91 | void free_iova(struct iova_domain *iovad, unsigned long pfn); | |
92 | void __free_iova(struct iova_domain *iovad, struct iova *iova); | |
93 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, | |
f76aec76 KA |
94 | unsigned long limit_pfn, |
95 | bool size_aligned); | |
9257b4a2 OP |
96 | void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, |
97 | unsigned long size); | |
98 | unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, | |
99 | unsigned long limit_pfn); | |
f8de50eb KA |
100 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
101 | unsigned long pfn_hi); | |
102 | void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); | |
0fb5fe87 RM |
103 | void init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
104 | unsigned long start_pfn, unsigned long pfn_32bit); | |
f8de50eb KA |
105 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
106 | void put_iova_domain(struct iova_domain *iovad); | |
75f05569 JL |
107 | struct iova *split_and_remove_iova(struct iova_domain *iovad, |
108 | struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi); | |
9257b4a2 | 109 | void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad); |
21aff52a TR |
110 | #else |
111 | static inline int iova_cache_get(void) | |
112 | { | |
113 | return -ENOTSUPP; | |
114 | } | |
115 | ||
116 | static inline void iova_cache_put(void) | |
117 | { | |
118 | } | |
119 | ||
120 | static inline struct iova *alloc_iova_mem(void) | |
121 | { | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | static inline void free_iova_mem(struct iova *iova) | |
126 | { | |
127 | } | |
128 | ||
129 | static inline void free_iova(struct iova_domain *iovad, unsigned long pfn) | |
130 | { | |
131 | } | |
132 | ||
133 | static inline void __free_iova(struct iova_domain *iovad, struct iova *iova) | |
134 | { | |
135 | } | |
136 | ||
137 | static inline struct iova *alloc_iova(struct iova_domain *iovad, | |
138 | unsigned long size, | |
139 | unsigned long limit_pfn, | |
140 | bool size_aligned) | |
141 | { | |
142 | return NULL; | |
143 | } | |
144 | ||
145 | static inline void free_iova_fast(struct iova_domain *iovad, | |
146 | unsigned long pfn, | |
147 | unsigned long size) | |
148 | { | |
149 | } | |
150 | ||
151 | static inline unsigned long alloc_iova_fast(struct iova_domain *iovad, | |
152 | unsigned long size, | |
153 | unsigned long limit_pfn) | |
154 | { | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static inline struct iova *reserve_iova(struct iova_domain *iovad, | |
159 | unsigned long pfn_lo, | |
160 | unsigned long pfn_hi) | |
161 | { | |
162 | return NULL; | |
163 | } | |
164 | ||
165 | static inline void copy_reserved_iova(struct iova_domain *from, | |
166 | struct iova_domain *to) | |
167 | { | |
168 | } | |
169 | ||
170 | static inline void init_iova_domain(struct iova_domain *iovad, | |
171 | unsigned long granule, | |
172 | unsigned long start_pfn, | |
173 | unsigned long pfn_32bit) | |
174 | { | |
175 | } | |
176 | ||
177 | static inline struct iova *find_iova(struct iova_domain *iovad, | |
178 | unsigned long pfn) | |
179 | { | |
180 | return NULL; | |
181 | } | |
182 | ||
183 | static inline void put_iova_domain(struct iova_domain *iovad) | |
184 | { | |
185 | } | |
186 | ||
187 | static inline struct iova *split_and_remove_iova(struct iova_domain *iovad, | |
188 | struct iova *iova, | |
189 | unsigned long pfn_lo, | |
190 | unsigned long pfn_hi) | |
191 | { | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | static inline void free_cpu_cached_iovas(unsigned int cpu, | |
196 | struct iova_domain *iovad) | |
197 | { | |
198 | } | |
199 | #endif | |
f8de50eb KA |
200 | |
201 | #endif |