tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
26struct device;
27
28struct iommu_domain {
29 void *priv;
30};
31
32#define IOMMU_CAP_CACHE_COHERENCY 0x1
33
34struct iommu_ops {
35 int (*domain_init)(struct iommu_domain *domain);
36 void (*domain_destroy)(struct iommu_domain *domain);
37 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
38 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
39 int (*map)(struct iommu_domain *domain, unsigned long iova,
40 phys_addr_t paddr, size_t size, int prot);
41 void (*unmap)(struct iommu_domain *domain, unsigned long iova,
42 size_t size);
43 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
44 unsigned long iova);
45 int (*domain_has_cap)(struct iommu_domain *domain,
46 unsigned long cap);
47};
48
49#ifdef CONFIG_IOMMU_API
50
51extern void register_iommu(struct iommu_ops *ops);
52extern bool iommu_found(void);
53extern struct iommu_domain *iommu_domain_alloc(void);
54extern void iommu_domain_free(struct iommu_domain *domain);
55extern int iommu_attach_device(struct iommu_domain *domain,
56 struct device *dev);
57extern void iommu_detach_device(struct iommu_domain *domain,
58 struct device *dev);
59extern int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
60 phys_addr_t paddr, size_t size, int prot);
61extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
62 size_t size);
63extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
64 unsigned long iova);
65extern int iommu_domain_has_cap(struct iommu_domain *domain,
66 unsigned long cap);
67
68#else /* CONFIG_IOMMU_API */
69
70static inline void register_iommu(struct iommu_ops *ops)
71{
72}
73
74static inline bool iommu_found(void)
75{
76 return false;
77}
78
79static inline struct iommu_domain *iommu_domain_alloc(void)
80{
81 return NULL;
82}
83
84static inline void iommu_domain_free(struct iommu_domain *domain)
85{
86}
87
88static inline int iommu_attach_device(struct iommu_domain *domain,
89 struct device *dev)
90{
91 return -ENODEV;
92}
93
94static inline void iommu_detach_device(struct iommu_domain *domain,
95 struct device *dev)
96{
97}
98
99static inline int iommu_map_range(struct iommu_domain *domain,
100 unsigned long iova, phys_addr_t paddr,
101 size_t size, int prot)
102{
103 return -ENODEV;
104}
105
106static inline void iommu_unmap_range(struct iommu_domain *domain,
107 unsigned long iova, size_t size)
108{
109}
110
111static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
112 unsigned long iova)
113{
114 return 0;
115}
116
117static inline int domain_has_cap(struct iommu_domain *domain,
118 unsigned long cap)
119{
120 return 0;
121}
122
123#endif /* CONFIG_IOMMU_API */
124
125#endif /* __LINUX_IOMMU_H */