99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 Intel Corporation
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* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
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*/
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#ifndef __LINUX_IOMMUFD_H
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#define __LINUX_IOMMUFD_H
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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struct device;
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struct iommufd_device;
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struct page;
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struct iommufd_ctx;
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struct iommufd_access;
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struct file;
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struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
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struct device *dev, u32 *id);
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void iommufd_device_unbind(struct iommufd_device *idev);
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int iommufd_device_attach(struct iommufd_device *idev, u32 *pt_id);
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void iommufd_device_detach(struct iommufd_device *idev);
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struct iommufd_access_ops {
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u8 needs_pin_pages : 1;
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void (*unmap)(void *data, unsigned long iova, unsigned long length);
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};
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enum {
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IOMMUFD_ACCESS_RW_READ = 0,
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IOMMUFD_ACCESS_RW_WRITE = 1 << 0,
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/* Set if the caller is in a kthread then rw will use kthread_use_mm() */
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IOMMUFD_ACCESS_RW_KTHREAD = 1 << 1,
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/* Only for use by selftest */
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__IOMMUFD_ACCESS_RW_SLOW_PATH = 1 << 2,
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};
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struct iommufd_access *
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iommufd_access_create(struct iommufd_ctx *ictx, u32 ioas_id,
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const struct iommufd_access_ops *ops, void *data);
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void iommufd_access_destroy(struct iommufd_access *access);
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void iommufd_ctx_get(struct iommufd_ctx *ictx);
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#if IS_ENABLED(CONFIG_IOMMUFD)
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struct iommufd_ctx *iommufd_ctx_from_file(struct file *file);
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void iommufd_ctx_put(struct iommufd_ctx *ictx);
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int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova,
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unsigned long length, struct page **out_pages,
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unsigned int flags);
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void iommufd_access_unpin_pages(struct iommufd_access *access,
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unsigned long iova, unsigned long length);
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int iommufd_access_rw(struct iommufd_access *access, unsigned long iova,
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void *data, size_t len, unsigned int flags);
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int iommufd_vfio_compat_ioas_id(struct iommufd_ctx *ictx, u32 *out_ioas_id);
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#else /* !CONFIG_IOMMUFD */
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static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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static inline void iommufd_ctx_put(struct iommufd_ctx *ictx)
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{
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}
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static inline int iommufd_access_pin_pages(struct iommufd_access *access,
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unsigned long iova,
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unsigned long length,
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struct page **out_pages,
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unsigned int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline void iommufd_access_unpin_pages(struct iommufd_access *access,
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unsigned long iova,
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unsigned long length)
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{
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}
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static inline int iommufd_access_rw(struct iommufd_access *access, unsigned long iova,
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void *data, size_t len, unsigned int flags)
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{
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return -EOPNOTSUPP;
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}
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static inline int iommufd_vfio_compat_ioas_id(struct iommufd_ctx *ictx,
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u32 *out_ioas_id)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_IOMMUFD */
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#endif
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