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 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); 23 24 int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id); 25 void iommufd_device_detach(struct iommufd_device *idev); 26 27 struct iommufd_access_ops { 28 u8 needs_pin_pages : 1; 29 void (*unmap)(void *data, unsigned long iova, unsigned long length); 30 }; 31 32 enum { 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, 37 38 /* Only for use by selftest */ 39 __IOMMUFD_ACCESS_RW_SLOW_PATH = 1 << 2, 40 }; 41 42 struct iommufd_access * 43 iommufd_access_create(struct iommufd_ctx *ictx, 44 const struct iommufd_access_ops *ops, void *data, u32 *id); 45 void iommufd_access_destroy(struct iommufd_access *access); 46 int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id); 47 48 void iommufd_ctx_get(struct iommufd_ctx *ictx); 49 50 #if IS_ENABLED(CONFIG_IOMMUFD) 51 struct iommufd_ctx *iommufd_ctx_from_file(struct file *file); 52 void iommufd_ctx_put(struct iommufd_ctx *ictx); 53 54 int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova, 55 unsigned long length, struct page **out_pages, 56 unsigned int flags); 57 void iommufd_access_unpin_pages(struct iommufd_access *access, 58 unsigned long iova, unsigned long length); 59 int iommufd_access_rw(struct iommufd_access *access, unsigned long iova, 60 void *data, size_t len, unsigned int flags); 61 int iommufd_vfio_compat_ioas_get_id(struct iommufd_ctx *ictx, u32 *out_ioas_id); 62 int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx); 63 int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx); 64 #else /* !CONFIG_IOMMUFD */ 65 static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file) 66 { 67 return ERR_PTR(-EOPNOTSUPP); 68 } 69 70 static inline void iommufd_ctx_put(struct iommufd_ctx *ictx) 71 { 72 } 73 74 static inline int iommufd_access_pin_pages(struct iommufd_access *access, 75 unsigned long iova, 76 unsigned long length, 77 struct page **out_pages, 78 unsigned int flags) 79 { 80 return -EOPNOTSUPP; 81 } 82 83 static inline void iommufd_access_unpin_pages(struct iommufd_access *access, 84 unsigned long iova, 85 unsigned long length) 86 { 87 } 88 89 static inline int iommufd_access_rw(struct iommufd_access *access, unsigned long iova, 90 void *data, size_t len, unsigned int flags) 91 { 92 return -EOPNOTSUPP; 93 } 94 95 static inline int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx) 96 { 97 return -EOPNOTSUPP; 98 } 99 100 static inline int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx) 101 { 102 return -EOPNOTSUPP; 103 } 104 #endif /* CONFIG_IOMMUFD */ 105 #endif 106