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
25struct device;
26
27struct iommu_domain {
28 void *priv;
29};
30
31struct 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
46extern void register_iommu(struct iommu_ops *ops);
47extern bool iommu_found(void);
48extern struct iommu_domain *iommu_domain_alloc(void);
49extern void iommu_domain_free(struct iommu_domain *domain);
50extern int iommu_attach_device(struct iommu_domain *domain,
51 struct device *dev);
52extern void iommu_detach_device(struct iommu_domain *domain,
53 struct device *dev);
54extern int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
55 phys_addr_t paddr, size_t size, int prot);
56extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
57 size_t size);
58extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
59 unsigned long iova);
60
61#else /* CONFIG_IOMMU_API */
62
63static inline void register_iommu(struct iommu_ops *ops)
64{
65}
66
67static inline bool iommu_found(void)
68{
69 return false;
70}
71
72static inline struct iommu_domain *iommu_domain_alloc(void)
73{
74 return NULL;
75}
76
77static inline void iommu_domain_free(struct iommu_domain *domain)
78{
79}
80
81static inline int iommu_attach_device(struct iommu_domain *domain,
82 struct device *dev)
83{
84 return -ENODEV;
85}
86
87static inline void iommu_detach_device(struct iommu_domain *domain,
88 struct device *dev)
89{
90}
91
92static 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
99static inline void iommu_unmap_range(struct iommu_domain *domain,
100 unsigned long iova, size_t size)
101{
102}
103
104static 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 */