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#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#define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */
34
35struct 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
52extern void register_iommu(struct iommu_ops *ops);
53extern bool iommu_found(void);
54extern struct iommu_domain *iommu_domain_alloc(void);
55extern void iommu_domain_free(struct iommu_domain *domain);
56extern int iommu_attach_device(struct iommu_domain *domain,
57 struct device *dev);
58extern void iommu_detach_device(struct iommu_domain *domain,
59 struct device *dev);
60extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
61 phys_addr_t paddr, int gfp_order, int prot);
62extern int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
63 int gfp_order);
64extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
65 unsigned long iova);
66extern int iommu_domain_has_cap(struct iommu_domain *domain,
67 unsigned long cap);
68
69#else /* CONFIG_IOMMU_API */
70
71static inline void register_iommu(struct iommu_ops *ops)
72{
73}
74
75static inline bool iommu_found(void)
76{
77 return false;
78}
79
80static inline struct iommu_domain *iommu_domain_alloc(void)
81{
82 return NULL;
83}
84
85static inline void iommu_domain_free(struct iommu_domain *domain)
86{
87}
88
89static inline int iommu_attach_device(struct iommu_domain *domain,
90 struct device *dev)
91{
92 return -ENODEV;
93}
94
95static inline void iommu_detach_device(struct iommu_domain *domain,
96 struct device *dev)
97{
98}
99
100static 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
106static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
107 int gfp_order)
108{
109 return -ENODEV;
110}
111
112static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
113 unsigned long iova)
114{
115 return 0;
116}
117
118static 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 */