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4a77a6cf JR |
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 | ||
74315ccc LA |
22 | #include <linux/errno.h> |
23 | ||
4a77a6cf JR |
24 | #define IOMMU_READ (1) |
25 | #define IOMMU_WRITE (2) | |
9cf06697 | 26 | #define IOMMU_CACHE (4) /* DMA cache coherency */ |
4a77a6cf | 27 | |
905d66c1 | 28 | struct iommu_ops; |
ff21776d | 29 | struct bus_type; |
4a77a6cf JR |
30 | struct device; |
31 | ||
32 | struct iommu_domain { | |
905d66c1 | 33 | struct iommu_ops *ops; |
4a77a6cf JR |
34 | void *priv; |
35 | }; | |
36 | ||
dbb9fd86 | 37 | #define IOMMU_CAP_CACHE_COHERENCY 0x1 |
323f99cb | 38 | #define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */ |
dbb9fd86 | 39 | |
39d4ebb9 JR |
40 | #ifdef CONFIG_IOMMU_API |
41 | ||
4a77a6cf JR |
42 | struct iommu_ops { |
43 | int (*domain_init)(struct iommu_domain *domain); | |
44 | void (*domain_destroy)(struct iommu_domain *domain); | |
45 | int (*attach_dev)(struct iommu_domain *domain, struct device *dev); | |
46 | void (*detach_dev)(struct iommu_domain *domain, struct device *dev); | |
67651786 JR |
47 | int (*map)(struct iommu_domain *domain, unsigned long iova, |
48 | phys_addr_t paddr, int gfp_order, int prot); | |
49 | int (*unmap)(struct iommu_domain *domain, unsigned long iova, | |
50 | int gfp_order); | |
4a77a6cf JR |
51 | phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, |
52 | unsigned long iova); | |
dbb9fd86 SY |
53 | int (*domain_has_cap)(struct iommu_domain *domain, |
54 | unsigned long cap); | |
4a77a6cf JR |
55 | }; |
56 | ||
4a77a6cf | 57 | extern void register_iommu(struct iommu_ops *ops); |
ff21776d | 58 | extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops); |
4a77a6cf | 59 | extern bool iommu_found(void); |
905d66c1 | 60 | extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); |
4a77a6cf JR |
61 | extern void iommu_domain_free(struct iommu_domain *domain); |
62 | extern int iommu_attach_device(struct iommu_domain *domain, | |
63 | struct device *dev); | |
64 | extern void iommu_detach_device(struct iommu_domain *domain, | |
65 | struct device *dev); | |
cefc53c7 JR |
66 | extern int iommu_map(struct iommu_domain *domain, unsigned long iova, |
67 | phys_addr_t paddr, int gfp_order, int prot); | |
68 | extern int iommu_unmap(struct iommu_domain *domain, unsigned long iova, | |
69 | int gfp_order); | |
4a77a6cf JR |
70 | extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, |
71 | unsigned long iova); | |
dbb9fd86 SY |
72 | extern int iommu_domain_has_cap(struct iommu_domain *domain, |
73 | unsigned long cap); | |
4a77a6cf JR |
74 | |
75 | #else /* CONFIG_IOMMU_API */ | |
76 | ||
39d4ebb9 | 77 | struct iommu_ops {}; |
4a77a6cf JR |
78 | |
79 | static inline bool iommu_found(void) | |
80 | { | |
81 | return false; | |
82 | } | |
83 | ||
905d66c1 | 84 | static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) |
4a77a6cf JR |
85 | { |
86 | return NULL; | |
87 | } | |
88 | ||
89 | static inline void iommu_domain_free(struct iommu_domain *domain) | |
90 | { | |
91 | } | |
92 | ||
93 | static inline int iommu_attach_device(struct iommu_domain *domain, | |
94 | struct device *dev) | |
95 | { | |
96 | return -ENODEV; | |
97 | } | |
98 | ||
99 | static inline void iommu_detach_device(struct iommu_domain *domain, | |
100 | struct device *dev) | |
101 | { | |
102 | } | |
103 | ||
cefc53c7 JR |
104 | static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, |
105 | phys_addr_t paddr, int gfp_order, int prot) | |
106 | { | |
107 | return -ENODEV; | |
108 | } | |
109 | ||
110 | static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova, | |
111 | int gfp_order) | |
112 | { | |
113 | return -ENODEV; | |
114 | } | |
115 | ||
4a77a6cf JR |
116 | static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, |
117 | unsigned long iova) | |
118 | { | |
119 | return 0; | |
120 | } | |
121 | ||
dbb9fd86 SY |
122 | static inline int domain_has_cap(struct iommu_domain *domain, |
123 | unsigned long cap) | |
124 | { | |
125 | return 0; | |
126 | } | |
127 | ||
4a77a6cf JR |
128 | #endif /* CONFIG_IOMMU_API */ |
129 | ||
130 | #endif /* __LINUX_IOMMU_H */ |