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 13struct device; 14struct iommufd_device; 15struct page; 16struct iommufd_ctx; 17struct iommufd_access; 18struct file; 19struct iommu_group; 20 21struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, 22 struct device *dev, u32 *id); 23void iommufd_device_unbind(struct iommufd_device *idev); 24 25int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id); 26int iommufd_device_replace(struct iommufd_device *idev, u32 *pt_id); 27void iommufd_device_detach(struct iommufd_device *idev); 28 29struct iommufd_ctx *iommufd_device_to_ictx(struct iommufd_device *idev); 30u32 iommufd_device_to_id(struct iommufd_device *idev); 31 32struct iommufd_access_ops { 33 u8 needs_pin_pages : 1; 34 void (*unmap)(void *data, unsigned long iova, unsigned long length); 35}; 36 37enum { 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 47struct iommufd_access * 48iommufd_access_create(struct iommufd_ctx *ictx, 49 const struct iommufd_access_ops *ops, void *data, u32 *id); 50void iommufd_access_destroy(struct iommufd_access *access); 51int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id); 52int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id); 53void iommufd_access_detach(struct iommufd_access *access); 54 55void iommufd_ctx_get(struct iommufd_ctx *ictx); 56 57#if IS_ENABLED(CONFIG_IOMMUFD) 58struct iommufd_ctx *iommufd_ctx_from_file(struct file *file); 59struct iommufd_ctx *iommufd_ctx_from_fd(int fd); 60void iommufd_ctx_put(struct iommufd_ctx *ictx); 61bool iommufd_ctx_has_group(struct iommufd_ctx *ictx, struct iommu_group *group); 62 63int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova, 64 unsigned long length, struct page **out_pages, 65 unsigned int flags); 66void iommufd_access_unpin_pages(struct iommufd_access *access, 67 unsigned long iova, unsigned long length); 68int iommufd_access_rw(struct iommufd_access *access, unsigned long iova, 69 void *data, size_t len, unsigned int flags); 70int iommufd_vfio_compat_ioas_get_id(struct iommufd_ctx *ictx, u32 *out_ioas_id); 71int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx); 72int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx); 73#else /* !CONFIG_IOMMUFD */ 74static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file) 75{ 76 return ERR_PTR(-EOPNOTSUPP); 77} 78 79static inline void iommufd_ctx_put(struct iommufd_ctx *ictx) 80{ 81} 82 83static 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 92static inline void iommufd_access_unpin_pages(struct iommufd_access *access, 93 unsigned long iova, 94 unsigned long length) 95{ 96} 97 98static 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 104static inline int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx) 105{ 106 return -EOPNOTSUPP; 107} 108 109static inline int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx) 110{ 111 return -EOPNOTSUPP; 112} 113#endif /* CONFIG_IOMMUFD */ 114#endif 115