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1 | /* |
2 | * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. |
3 | * Author: Joerg Roedel <joerg.roedel@amd.com> |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License version 2 as published |
7 | * by the Free Software Foundation. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
18 | |
19 | #ifndef __LINUX_IOMMU_H |
20 | #define __LINUX_IOMMU_H |
21 | |
22 | #define IOMMU_READ (1) |
23 | #define IOMMU_WRITE (2) |
24 | #define IOMMU_CACHE (4) /* DMA cache coherency */ |
25 | |
26 | struct device; |
27 | |
28 | struct iommu_domain { |
29 | void *priv; |
30 | }; |
31 | |
32 | #define IOMMU_CAP_CACHE_COHERENCY 0x1 |
33 | #define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */ |
34 | |
35 | struct iommu_ops { |
36 | int (*domain_init)(struct iommu_domain *domain); |
37 | void (*domain_destroy)(struct iommu_domain *domain); |
38 | int (*attach_dev)(struct iommu_domain *domain, struct device *dev); |
39 | void (*detach_dev)(struct iommu_domain *domain, struct device *dev); |
40 | int (*map)(struct iommu_domain *domain, unsigned long iova, |
41 | phys_addr_t paddr, int gfp_order, int prot); |
42 | int (*unmap)(struct iommu_domain *domain, unsigned long iova, |
43 | int gfp_order); |
44 | phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, |
45 | unsigned long iova); |
46 | int (*domain_has_cap)(struct iommu_domain *domain, |
47 | unsigned long cap); |
48 | }; |
49 | |
50 | #ifdef CONFIG_IOMMU_API |
51 | |
52 | extern void register_iommu(struct iommu_ops *ops); |
53 | extern bool iommu_found(void); |
54 | extern struct iommu_domain *iommu_domain_alloc(void); |
55 | extern void iommu_domain_free(struct iommu_domain *domain); |
56 | extern int iommu_attach_device(struct iommu_domain *domain, |
57 | struct device *dev); |
58 | extern void iommu_detach_device(struct iommu_domain *domain, |
59 | struct device *dev); |
60 | extern int iommu_map(struct iommu_domain *domain, unsigned long iova, |
61 | phys_addr_t paddr, int gfp_order, int prot); |
62 | extern int iommu_unmap(struct iommu_domain *domain, unsigned long iova, |
63 | int gfp_order); |
64 | extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, |
65 | unsigned long iova); |
66 | extern int iommu_domain_has_cap(struct iommu_domain *domain, |
67 | unsigned long cap); |
68 | |
69 | #else /* CONFIG_IOMMU_API */ |
70 | |
71 | static inline void register_iommu(struct iommu_ops *ops) |
72 | { |
73 | } |
74 | |
75 | static inline bool iommu_found(void) |
76 | { |
77 | return false; |
78 | } |
79 | |
80 | static inline struct iommu_domain *iommu_domain_alloc(void) |
81 | { |
82 | return NULL; |
83 | } |
84 | |
85 | static inline void iommu_domain_free(struct iommu_domain *domain) |
86 | { |
87 | } |
88 | |
89 | static inline int iommu_attach_device(struct iommu_domain *domain, |
90 | struct device *dev) |
91 | { |
92 | return -ENODEV; |
93 | } |
94 | |
95 | static inline void iommu_detach_device(struct iommu_domain *domain, |
96 | struct device *dev) |
97 | { |
98 | } |
99 | |
100 | static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, |
101 | phys_addr_t paddr, int gfp_order, int prot) |
102 | { |
103 | return -ENODEV; |
104 | } |
105 | |
106 | static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova, |
107 | int gfp_order) |
108 | { |
109 | return -ENODEV; |
110 | } |
111 | |
112 | static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, |
113 | unsigned long iova) |
114 | { |
115 | return 0; |
116 | } |
117 | |
118 | static inline int domain_has_cap(struct iommu_domain *domain, |
119 | unsigned long cap) |
120 | { |
121 | return 0; |
122 | } |
123 | |
124 | #endif /* CONFIG_IOMMU_API */ |
125 | |
126 | #endif /* __LINUX_IOMMU_H */ |
127 |
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