Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | /* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2012 Red Hat, Inc. All rights reserved. * Author: Alex Williamson <alex.williamson@redhat.com> */ #ifndef __VFIO_VFIO_H__ #define __VFIO_VFIO_H__ #include <linux/device.h> #include <linux/cdev.h> #include <linux/module.h> struct iommu_group; struct vfio_device; struct vfio_container; enum vfio_group_type { /* * Physical device with IOMMU backing. */ VFIO_IOMMU, /* * Virtual device without IOMMU backing. The VFIO core fakes up an * iommu_group as the iommu_group sysfs interface is part of the * userspace ABI. The user of these devices must not be able to * directly trigger unmediated DMA. */ VFIO_EMULATED_IOMMU, /* * Physical device without IOMMU backing. The VFIO core fakes up an * iommu_group as the iommu_group sysfs interface is part of the * userspace ABI. Users can trigger unmediated DMA by the device, * usage is highly dangerous, requires an explicit opt-in and will * taint the kernel. */ VFIO_NO_IOMMU, }; struct vfio_group { struct device dev; struct cdev cdev; /* * When drivers is non-zero a driver is attached to the struct device * that provided the iommu_group and thus the iommu_group is a valid * pointer. When drivers is 0 the driver is being detached. Once users * reaches 0 then the iommu_group is invalid. */ refcount_t drivers; unsigned int container_users; struct iommu_group *iommu_group; struct vfio_container *container; struct list_head device_list; struct mutex device_lock; struct list_head vfio_next; struct list_head container_next; enum vfio_group_type type; struct mutex group_lock; struct kvm *kvm; struct file *opened_file; struct blocking_notifier_head notifier; }; /* events for the backend driver notify callback */ enum vfio_iommu_notify_type { VFIO_IOMMU_CONTAINER_CLOSE = 0, }; /** * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks */ struct vfio_iommu_driver_ops { char *name; struct module *owner; void *(*open)(unsigned long arg); void (*release)(void *iommu_data); long (*ioctl)(void *iommu_data, unsigned int cmd, unsigned long arg); int (*attach_group)(void *iommu_data, struct iommu_group *group, enum vfio_group_type); void (*detach_group)(void *iommu_data, struct iommu_group *group); int (*pin_pages)(void *iommu_data, struct iommu_group *group, dma_addr_t user_iova, int npage, int prot, struct page **pages); void (*unpin_pages)(void *iommu_data, dma_addr_t user_iova, int npage); void (*register_device)(void *iommu_data, struct vfio_device *vdev); void (*unregister_device)(void *iommu_data, struct vfio_device *vdev); int (*dma_rw)(void *iommu_data, dma_addr_t user_iova, void *data, size_t count, bool write); struct iommu_domain *(*group_iommu_domain)(void *iommu_data, struct iommu_group *group); void (*notify)(void *iommu_data, enum vfio_iommu_notify_type event); }; struct vfio_iommu_driver { const struct vfio_iommu_driver_ops *ops; struct list_head vfio_next; }; int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops); void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops); bool vfio_assert_device_open(struct vfio_device *device); struct vfio_container *vfio_container_from_file(struct file *filep); int vfio_device_assign_container(struct vfio_device *device); void vfio_device_unassign_container(struct vfio_device *device); int vfio_container_attach_group(struct vfio_container *container, struct vfio_group *group); void vfio_group_detach_container(struct vfio_group *group); void vfio_device_container_register(struct vfio_device *device); void vfio_device_container_unregister(struct vfio_device *device); long vfio_container_ioctl_check_extension(struct vfio_container *container, unsigned long arg); int __init vfio_container_init(void); void vfio_container_cleanup(void); #ifdef CONFIG_VFIO_NOIOMMU extern bool vfio_noiommu __read_mostly; #else enum { vfio_noiommu = false }; #endif #endif |