1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2021 Intel Corporation
4 * Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
6 #ifndef __LINUX_IOMMUFD_H
7 #define __LINUX_IOMMUFD_H
9 #include <linux/types.h>
10 #include <linux/errno.h>
11 #include <linux/err.h>
14 struct iommufd_device;
17 struct iommufd_access;
20 struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
21 struct device *dev, u32 *id);
22 void iommufd_device_unbind(struct iommufd_device *idev);
24 int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id);
25 void iommufd_device_detach(struct iommufd_device *idev);
27 struct iommufd_access_ops {
28 u8 needs_pin_pages : 1;
29 void (*unmap)(void *data, unsigned long iova, unsigned long length);
33 IOMMUFD_ACCESS_RW_READ = 0,
34 IOMMUFD_ACCESS_RW_WRITE = 1 << 0,
35 /* Set if the caller is in a kthread then rw will use kthread_use_mm() */
36 IOMMUFD_ACCESS_RW_KTHREAD = 1 << 1,
38 /* Only for use by selftest */
39 __IOMMUFD_ACCESS_RW_SLOW_PATH = 1 << 2,
42 struct iommufd_access *
43 iommufd_access_create(struct iommufd_ctx *ictx, u32 ioas_id,
44 const struct iommufd_access_ops *ops, void *data);
45 void iommufd_access_destroy(struct iommufd_access *access);
47 void iommufd_ctx_get(struct iommufd_ctx *ictx);
49 #if IS_ENABLED(CONFIG_IOMMUFD)
50 struct iommufd_ctx *iommufd_ctx_from_file(struct file *file);
51 void iommufd_ctx_put(struct iommufd_ctx *ictx);
53 int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova,
54 unsigned long length, struct page **out_pages,
56 void iommufd_access_unpin_pages(struct iommufd_access *access,
57 unsigned long iova, unsigned long length);
58 int iommufd_access_rw(struct iommufd_access *access, unsigned long iova,
59 void *data, size_t len, unsigned int flags);
60 int iommufd_vfio_compat_ioas_id(struct iommufd_ctx *ictx, u32 *out_ioas_id);
61 #else /* !CONFIG_IOMMUFD */
62 static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file)
64 return ERR_PTR(-EOPNOTSUPP);
67 static inline void iommufd_ctx_put(struct iommufd_ctx *ictx)
71 static inline int iommufd_access_pin_pages(struct iommufd_access *access,
74 struct page **out_pages,
80 static inline void iommufd_access_unpin_pages(struct iommufd_access *access,
86 static inline int iommufd_access_rw(struct iommufd_access *access, unsigned long iova,
87 void *data, size_t len, unsigned int flags)
92 static inline int iommufd_vfio_compat_ioas_id(struct iommufd_ctx *ictx,
97 #endif /* CONFIG_IOMMUFD */