268 lines
7.5 KiB
C
268 lines
7.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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* Author: Alex Williamson <alex.williamson@redhat.com>
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*/
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#ifndef __VFIO_VFIO_H__
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#define __VFIO_VFIO_H__
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#include <linux/file.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <linux/module.h>
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#include <linux/vfio.h>
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struct iommufd_ctx;
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struct iommu_group;
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struct vfio_container;
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void vfio_device_put_registration(struct vfio_device *device);
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bool vfio_device_try_get_registration(struct vfio_device *device);
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int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd);
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void vfio_device_close(struct vfio_device *device,
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struct iommufd_ctx *iommufd);
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extern const struct file_operations vfio_device_fops;
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enum vfio_group_type {
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/*
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* Physical device with IOMMU backing.
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*/
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VFIO_IOMMU,
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/*
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* Virtual device without IOMMU backing. The VFIO core fakes up an
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* iommu_group as the iommu_group sysfs interface is part of the
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* userspace ABI. The user of these devices must not be able to
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* directly trigger unmediated DMA.
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*/
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VFIO_EMULATED_IOMMU,
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/*
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* Physical device without IOMMU backing. The VFIO core fakes up an
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* iommu_group as the iommu_group sysfs interface is part of the
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* userspace ABI. Users can trigger unmediated DMA by the device,
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* usage is highly dangerous, requires an explicit opt-in and will
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* taint the kernel.
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*/
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VFIO_NO_IOMMU,
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};
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struct vfio_group {
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struct device dev;
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struct cdev cdev;
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/*
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* When drivers is non-zero a driver is attached to the struct device
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* that provided the iommu_group and thus the iommu_group is a valid
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* pointer. When drivers is 0 the driver is being detached. Once users
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* reaches 0 then the iommu_group is invalid.
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*/
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refcount_t drivers;
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unsigned int container_users;
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struct iommu_group *iommu_group;
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struct vfio_container *container;
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struct list_head device_list;
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struct mutex device_lock;
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struct list_head vfio_next;
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#if IS_ENABLED(CONFIG_VFIO_CONTAINER)
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struct list_head container_next;
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#endif
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enum vfio_group_type type;
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struct mutex group_lock;
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struct kvm *kvm;
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struct file *opened_file;
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struct blocking_notifier_head notifier;
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struct iommufd_ctx *iommufd;
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spinlock_t kvm_ref_lock;
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};
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int vfio_device_set_group(struct vfio_device *device,
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enum vfio_group_type type);
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void vfio_device_remove_group(struct vfio_device *device);
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void vfio_device_group_register(struct vfio_device *device);
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void vfio_device_group_unregister(struct vfio_device *device);
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int vfio_device_group_use_iommu(struct vfio_device *device);
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void vfio_device_group_unuse_iommu(struct vfio_device *device);
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void vfio_device_group_close(struct vfio_device *device);
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bool vfio_device_has_container(struct vfio_device *device);
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int __init vfio_group_init(void);
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void vfio_group_cleanup(void);
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static inline bool vfio_device_is_noiommu(struct vfio_device *vdev)
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{
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return IS_ENABLED(CONFIG_VFIO_NOIOMMU) &&
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vdev->group->type == VFIO_NO_IOMMU;
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}
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#if IS_ENABLED(CONFIG_VFIO_CONTAINER)
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/**
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* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
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*/
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struct vfio_iommu_driver_ops {
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char *name;
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struct module *owner;
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void *(*open)(unsigned long arg);
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void (*release)(void *iommu_data);
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long (*ioctl)(void *iommu_data, unsigned int cmd,
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unsigned long arg);
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int (*attach_group)(void *iommu_data,
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struct iommu_group *group,
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enum vfio_group_type);
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void (*detach_group)(void *iommu_data,
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struct iommu_group *group);
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int (*pin_pages)(void *iommu_data,
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struct iommu_group *group,
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dma_addr_t user_iova,
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int npage, int prot,
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struct page **pages);
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void (*unpin_pages)(void *iommu_data,
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dma_addr_t user_iova, int npage);
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void (*register_device)(void *iommu_data,
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struct vfio_device *vdev);
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void (*unregister_device)(void *iommu_data,
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struct vfio_device *vdev);
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int (*dma_rw)(void *iommu_data, dma_addr_t user_iova,
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void *data, size_t count, bool write);
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struct iommu_domain *(*group_iommu_domain)(void *iommu_data,
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struct iommu_group *group);
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};
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struct vfio_iommu_driver {
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const struct vfio_iommu_driver_ops *ops;
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struct list_head vfio_next;
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};
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int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
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void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops);
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struct vfio_container *vfio_container_from_file(struct file *filep);
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int vfio_group_use_container(struct vfio_group *group);
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void vfio_group_unuse_container(struct vfio_group *group);
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int vfio_container_attach_group(struct vfio_container *container,
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struct vfio_group *group);
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void vfio_group_detach_container(struct vfio_group *group);
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void vfio_device_container_register(struct vfio_device *device);
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void vfio_device_container_unregister(struct vfio_device *device);
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int vfio_device_container_pin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage,
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int prot, struct page **pages);
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void vfio_device_container_unpin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage);
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int vfio_device_container_dma_rw(struct vfio_device *device,
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dma_addr_t iova, void *data,
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size_t len, bool write);
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int __init vfio_container_init(void);
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void vfio_container_cleanup(void);
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#else
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static inline struct vfio_container *
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vfio_container_from_file(struct file *filep)
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{
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return NULL;
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}
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static inline int vfio_group_use_container(struct vfio_group *group)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_group_unuse_container(struct vfio_group *group)
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{
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}
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static inline int vfio_container_attach_group(struct vfio_container *container,
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struct vfio_group *group)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_group_detach_container(struct vfio_group *group)
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{
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}
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static inline void vfio_device_container_register(struct vfio_device *device)
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{
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}
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static inline void vfio_device_container_unregister(struct vfio_device *device)
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{
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}
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static inline int vfio_device_container_pin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage,
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int prot, struct page **pages)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_device_container_unpin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage)
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{
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}
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static inline int vfio_device_container_dma_rw(struct vfio_device *device,
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dma_addr_t iova, void *data,
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size_t len, bool write)
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{
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return -EOPNOTSUPP;
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}
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static inline int vfio_container_init(void)
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{
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return 0;
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}
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static inline void vfio_container_cleanup(void)
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{
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}
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#endif
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#if IS_ENABLED(CONFIG_IOMMUFD)
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int vfio_iommufd_bind(struct vfio_device *device, struct iommufd_ctx *ictx);
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void vfio_iommufd_unbind(struct vfio_device *device);
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#else
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static inline int vfio_iommufd_bind(struct vfio_device *device,
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struct iommufd_ctx *ictx)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_iommufd_unbind(struct vfio_device *device)
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{
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}
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#endif
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#if IS_ENABLED(CONFIG_VFIO_VIRQFD)
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int __init vfio_virqfd_init(void);
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void vfio_virqfd_exit(void);
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#else
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static inline int __init vfio_virqfd_init(void)
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{
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return 0;
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}
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static inline void vfio_virqfd_exit(void)
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{
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}
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#endif
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#ifdef CONFIG_VFIO_NOIOMMU
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extern bool vfio_noiommu __read_mostly;
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#else
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enum { vfio_noiommu = false };
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#endif
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#ifdef CONFIG_HAVE_KVM
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void _vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm);
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void vfio_device_put_kvm(struct vfio_device *device);
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#else
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static inline void _vfio_device_get_kvm_safe(struct vfio_device *device,
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struct kvm *kvm)
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{
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}
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static inline void vfio_device_put_kvm(struct vfio_device *device)
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{
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}
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#endif
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#endif
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