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