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
25 struct device;
26
27 struct iommu_domain {
28 void *priv;
29 };
30
31 struct iommu_ops {
32 int (*domain_init)(struct iommu_domain *domain);
33 void (*domain_destroy)(struct iommu_domain *domain);
34 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
35 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
36 int (*map)(struct iommu_domain *domain, unsigned long iova,
37 phys_addr_t paddr, size_t size, int prot);
38 void (*unmap)(struct iommu_domain *domain, unsigned long iova,
39 size_t size);
40 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
41 unsigned long iova);
42 };
43
44 #ifdef CONFIG_IOMMU_API
45
46 extern void register_iommu(struct iommu_ops *ops);
47 extern bool iommu_found(void);
48 extern struct iommu_domain *iommu_domain_alloc(void);
49 extern void iommu_domain_free(struct iommu_domain *domain);
50 extern int iommu_attach_device(struct iommu_domain *domain,
51 struct device *dev);
52 extern void iommu_detach_device(struct iommu_domain *domain,
53 struct device *dev);
54 extern int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
55 phys_addr_t paddr, size_t size, int prot);
56 extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
57 size_t size);
58 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
59 unsigned long iova);
60
61 #else /* CONFIG_IOMMU_API */
62
register_iommu(struct iommu_ops * ops)63 static inline void register_iommu(struct iommu_ops *ops)
64 {
65 }
66
iommu_found(void)67 static inline bool iommu_found(void)
68 {
69 return false;
70 }
71
iommu_domain_alloc(void)72 static inline struct iommu_domain *iommu_domain_alloc(void)
73 {
74 return NULL;
75 }
76
iommu_domain_free(struct iommu_domain * domain)77 static inline void iommu_domain_free(struct iommu_domain *domain)
78 {
79 }
80
iommu_attach_device(struct iommu_domain * domain,struct device * dev)81 static inline int iommu_attach_device(struct iommu_domain *domain,
82 struct device *dev)
83 {
84 return -ENODEV;
85 }
86
iommu_detach_device(struct iommu_domain * domain,struct device * dev)87 static inline void iommu_detach_device(struct iommu_domain *domain,
88 struct device *dev)
89 {
90 }
91
iommu_map_range(struct iommu_domain * domain,unsigned long iova,phys_addr_t paddr,size_t size,int prot)92 static inline int iommu_map_range(struct iommu_domain *domain,
93 unsigned long iova, phys_addr_t paddr,
94 size_t size, int prot)
95 {
96 return -ENODEV;
97 }
98
iommu_unmap_range(struct iommu_domain * domain,unsigned long iova,size_t size)99 static inline void iommu_unmap_range(struct iommu_domain *domain,
100 unsigned long iova, size_t size)
101 {
102 }
103
iommu_iova_to_phys(struct iommu_domain * domain,unsigned long iova)104 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
105 unsigned long iova)
106 {
107 return 0;
108 }
109
110 #endif /* CONFIG_IOMMU_API */
111
112 #endif /* __LINUX_IOMMU_H */
113