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
register_iommu(struct iommu_ops * ops)71 static inline void register_iommu(struct iommu_ops *ops)
72 {
73 }
74
iommu_found(void)75 static inline bool iommu_found(void)
76 {
77 return false;
78 }
79
iommu_domain_alloc(void)80 static inline struct iommu_domain *iommu_domain_alloc(void)
81 {
82 return NULL;
83 }
84
iommu_domain_free(struct iommu_domain * domain)85 static inline void iommu_domain_free(struct iommu_domain *domain)
86 {
87 }
88
iommu_attach_device(struct iommu_domain * domain,struct device * dev)89 static inline int iommu_attach_device(struct iommu_domain *domain,
90 struct device *dev)
91 {
92 return -ENODEV;
93 }
94
iommu_detach_device(struct iommu_domain * domain,struct device * dev)95 static inline void iommu_detach_device(struct iommu_domain *domain,
96 struct device *dev)
97 {
98 }
99
iommu_map(struct iommu_domain * domain,unsigned long iova,phys_addr_t paddr,int gfp_order,int prot)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
iommu_unmap(struct iommu_domain * domain,unsigned long iova,int gfp_order)106 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
107 int gfp_order)
108 {
109 return -ENODEV;
110 }
111
iommu_iova_to_phys(struct iommu_domain * domain,unsigned long iova)112 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
113 unsigned long iova)
114 {
115 return 0;
116 }
117
domain_has_cap(struct iommu_domain * domain,unsigned long cap)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