1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * Copyright (C) 2021 Intel Corporation |
4 | * Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES |
5 | */ |
6 | #ifndef __LINUX_IOMMUFD_H |
7 | #define __LINUX_IOMMUFD_H |
8 | |
9 | #include <linux/types.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/err.h> |
12 | |
13 | struct device; |
14 | struct iommufd_device; |
15 | struct page; |
16 | struct iommufd_ctx; |
17 | struct iommufd_access; |
18 | struct file; |
19 | struct iommu_group; |
20 | |
21 | struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, |
22 | struct device *dev, u32 *id); |
23 | void iommufd_device_unbind(struct iommufd_device *idev); |
24 | |
25 | int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id); |
26 | int iommufd_device_replace(struct iommufd_device *idev, u32 *pt_id); |
27 | void iommufd_device_detach(struct iommufd_device *idev); |
28 | |
29 | struct iommufd_ctx *iommufd_device_to_ictx(struct iommufd_device *idev); |
30 | u32 iommufd_device_to_id(struct iommufd_device *idev); |
31 | |
32 | struct iommufd_access_ops { |
33 | u8 needs_pin_pages : 1; |
34 | void (*unmap)(void *data, unsigned long iova, unsigned long length); |
35 | }; |
36 | |
37 | enum { |
38 | IOMMUFD_ACCESS_RW_READ = 0, |
39 | IOMMUFD_ACCESS_RW_WRITE = 1 << 0, |
40 | /* Set if the caller is in a kthread then rw will use kthread_use_mm() */ |
41 | IOMMUFD_ACCESS_RW_KTHREAD = 1 << 1, |
42 | |
43 | /* Only for use by selftest */ |
44 | __IOMMUFD_ACCESS_RW_SLOW_PATH = 1 << 2, |
45 | }; |
46 | |
47 | struct iommufd_access * |
48 | iommufd_access_create(struct iommufd_ctx *ictx, |
49 | const struct iommufd_access_ops *ops, void *data, u32 *id); |
50 | void iommufd_access_destroy(struct iommufd_access *access); |
51 | int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id); |
52 | int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id); |
53 | void iommufd_access_detach(struct iommufd_access *access); |
54 | |
55 | void iommufd_ctx_get(struct iommufd_ctx *ictx); |
56 | |
57 | #if IS_ENABLED(CONFIG_IOMMUFD) |
58 | struct iommufd_ctx *iommufd_ctx_from_file(struct file *file); |
59 | struct iommufd_ctx *iommufd_ctx_from_fd(int fd); |
60 | void iommufd_ctx_put(struct iommufd_ctx *ictx); |
61 | bool iommufd_ctx_has_group(struct iommufd_ctx *ictx, struct iommu_group *group); |
62 | |
63 | int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova, |
64 | unsigned long length, struct page **out_pages, |
65 | unsigned int flags); |
66 | void iommufd_access_unpin_pages(struct iommufd_access *access, |
67 | unsigned long iova, unsigned long length); |
68 | int iommufd_access_rw(struct iommufd_access *access, unsigned long iova, |
69 | void *data, size_t len, unsigned int flags); |
70 | int iommufd_vfio_compat_ioas_get_id(struct iommufd_ctx *ictx, u32 *out_ioas_id); |
71 | int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx); |
72 | int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx); |
73 | #else /* !CONFIG_IOMMUFD */ |
74 | static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file) |
75 | { |
76 | return ERR_PTR(-EOPNOTSUPP); |
77 | } |
78 | |
79 | static inline void iommufd_ctx_put(struct iommufd_ctx *ictx) |
80 | { |
81 | } |
82 | |
83 | static inline int iommufd_access_pin_pages(struct iommufd_access *access, |
84 | unsigned long iova, |
85 | unsigned long length, |
86 | struct page **out_pages, |
87 | unsigned int flags) |
88 | { |
89 | return -EOPNOTSUPP; |
90 | } |
91 | |
92 | static inline void iommufd_access_unpin_pages(struct iommufd_access *access, |
93 | unsigned long iova, |
94 | unsigned long length) |
95 | { |
96 | } |
97 | |
98 | static inline int iommufd_access_rw(struct iommufd_access *access, unsigned long iova, |
99 | void *data, size_t len, unsigned int flags) |
100 | { |
101 | return -EOPNOTSUPP; |
102 | } |
103 | |
104 | static inline int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx) |
105 | { |
106 | return -EOPNOTSUPP; |
107 | } |
108 | |
109 | static inline int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx) |
110 | { |
111 | return -EOPNOTSUPP; |
112 | } |
113 | #endif /* CONFIG_IOMMUFD */ |
114 | #endif |
115 | |