1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (c) 2006, Intel Corporation.
4 *
5 * Copyright (C) 2006-2008 Intel Corporation
6 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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>
15 #include <linux/dma-mapping.h>
16 #include <linux/android_vendor.h>
17
18 /* iova structure */
19 struct iova {
20 struct rb_node node;
21 unsigned long pfn_hi; /* Highest allocated pfn */
22 unsigned long pfn_lo; /* Lowest allocated pfn */
23 };
24
25
26 struct iova_rcache;
27
28 /* holds all the iova translations for a domain */
29 struct iova_domain {
30 spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
31 struct rb_root rbroot; /* iova domain rbtree root */
32 struct rb_node *cached_node; /* Save last alloced node */
33 struct rb_node *cached32_node; /* Save last 32-bit alloced node */
34 unsigned long granule; /* pfn granularity for this domain */
35 unsigned long start_pfn; /* Lower limit for this domain */
36 unsigned long dma_32bit_pfn;
37 unsigned long max32_alloc_size; /* Size of last failed allocation */
38 struct iova anchor; /* rbtree lookup anchor */
39
40 struct iova_rcache *rcaches;
41 struct hlist_node cpuhp_dead;
42
43 ANDROID_VENDOR_DATA(1);
44 };
45
iova_size(struct iova * iova)46 static inline unsigned long iova_size(struct iova *iova)
47 {
48 return iova->pfn_hi - iova->pfn_lo + 1;
49 }
50
iova_shift(struct iova_domain * iovad)51 static inline unsigned long iova_shift(struct iova_domain *iovad)
52 {
53 return __ffs(iovad->granule);
54 }
55
iova_mask(struct iova_domain * iovad)56 static inline unsigned long iova_mask(struct iova_domain *iovad)
57 {
58 return iovad->granule - 1;
59 }
60
iova_offset(struct iova_domain * iovad,dma_addr_t iova)61 static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
62 {
63 return iova & iova_mask(iovad);
64 }
65
iova_align(struct iova_domain * iovad,size_t size)66 static inline size_t iova_align(struct iova_domain *iovad, size_t size)
67 {
68 return ALIGN(size, iovad->granule);
69 }
70
iova_align_down(struct iova_domain * iovad,size_t size)71 static inline size_t iova_align_down(struct iova_domain *iovad, size_t size)
72 {
73 return ALIGN_DOWN(size, iovad->granule);
74 }
75
iova_dma_addr(struct iova_domain * iovad,struct iova * iova)76 static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
77 {
78 return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
79 }
80
iova_pfn(struct iova_domain * iovad,dma_addr_t iova)81 static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
82 {
83 return iova >> iova_shift(iovad);
84 }
85
86 #if IS_REACHABLE(CONFIG_IOMMU_IOVA)
87 int iova_cache_get(void);
88 void iova_cache_put(void);
89
90 unsigned long iova_rcache_range(void);
91
92 void free_iova(struct iova_domain *iovad, unsigned long pfn);
93 void __free_iova(struct iova_domain *iovad, struct iova *iova);
94 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
95 unsigned long limit_pfn,
96 bool size_aligned);
97 void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
98 unsigned long size);
99 unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
100 unsigned long limit_pfn, bool flush_rcache);
101 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
102 unsigned long pfn_hi);
103 void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
104 unsigned long start_pfn);
105 int iova_domain_init_rcaches(struct iova_domain *iovad);
106 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
107 void put_iova_domain(struct iova_domain *iovad);
108 #else
iova_cache_get(void)109 static inline int iova_cache_get(void)
110 {
111 return -ENOTSUPP;
112 }
113
iova_cache_put(void)114 static inline void iova_cache_put(void)
115 {
116 }
117
free_iova(struct iova_domain * iovad,unsigned long pfn)118 static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
119 {
120 }
121
__free_iova(struct iova_domain * iovad,struct iova * iova)122 static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
123 {
124 }
125
alloc_iova(struct iova_domain * iovad,unsigned long size,unsigned long limit_pfn,bool size_aligned)126 static inline struct iova *alloc_iova(struct iova_domain *iovad,
127 unsigned long size,
128 unsigned long limit_pfn,
129 bool size_aligned)
130 {
131 return NULL;
132 }
133
free_iova_fast(struct iova_domain * iovad,unsigned long pfn,unsigned long size)134 static inline void free_iova_fast(struct iova_domain *iovad,
135 unsigned long pfn,
136 unsigned long size)
137 {
138 }
139
alloc_iova_fast(struct iova_domain * iovad,unsigned long size,unsigned long limit_pfn,bool flush_rcache)140 static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
141 unsigned long size,
142 unsigned long limit_pfn,
143 bool flush_rcache)
144 {
145 return 0;
146 }
147
reserve_iova(struct iova_domain * iovad,unsigned long pfn_lo,unsigned long pfn_hi)148 static inline struct iova *reserve_iova(struct iova_domain *iovad,
149 unsigned long pfn_lo,
150 unsigned long pfn_hi)
151 {
152 return NULL;
153 }
154
init_iova_domain(struct iova_domain * iovad,unsigned long granule,unsigned long start_pfn)155 static inline void init_iova_domain(struct iova_domain *iovad,
156 unsigned long granule,
157 unsigned long start_pfn)
158 {
159 }
160
find_iova(struct iova_domain * iovad,unsigned long pfn)161 static inline struct iova *find_iova(struct iova_domain *iovad,
162 unsigned long pfn)
163 {
164 return NULL;
165 }
166
put_iova_domain(struct iova_domain * iovad)167 static inline void put_iova_domain(struct iova_domain *iovad)
168 {
169 }
170
171 #endif
172
173 #endif
174