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