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1/*
2 * VFIO API definition
3 *
4 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
5 * Author: Alex Williamson <alex.williamson@redhat.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#ifndef VFIO_H
12#define VFIO_H
13
14
15#include <linux/iommu.h>
16#include <linux/mm.h>
17#include <linux/workqueue.h>
18#include <linux/poll.h>
19#include <uapi/linux/vfio.h>
20
21/**
22 * struct vfio_device_ops - VFIO bus driver device callbacks
23 *
24 * @open: Called when userspace creates new file descriptor for device
25 * @release: Called when userspace releases file descriptor for device
26 * @read: Perform read(2) on device file descriptor
27 * @write: Perform write(2) on device file descriptor
28 * @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
29 * operations documented below
30 * @mmap: Perform mmap(2) on a region of the device file descriptor
31 * @request: Request for the bus driver to release the device
32 */
33struct vfio_device_ops {
34 char *name;
35 int (*open)(void *device_data);
36 void (*release)(void *device_data);
37 ssize_t (*read)(void *device_data, char __user *buf,
38 size_t count, loff_t *ppos);
39 ssize_t (*write)(void *device_data, const char __user *buf,
40 size_t count, loff_t *size);
41 long (*ioctl)(void *device_data, unsigned int cmd,
42 unsigned long arg);
43 int (*mmap)(void *device_data, struct vm_area_struct *vma);
44 void (*request)(void *device_data, unsigned int count);
45};
46
47extern struct iommu_group *vfio_iommu_group_get(struct device *dev);
48extern void vfio_iommu_group_put(struct iommu_group *group, struct device *dev);
49
50extern int vfio_add_group_dev(struct device *dev,
51 const struct vfio_device_ops *ops,
52 void *device_data);
53
54extern void *vfio_del_group_dev(struct device *dev);
55extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
56extern void vfio_device_put(struct vfio_device *device);
57extern void *vfio_device_data(struct vfio_device *device);
58
59/**
60 * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
61 */
62struct vfio_iommu_driver_ops {
63 char *name;
64 struct module *owner;
65 void *(*open)(unsigned long arg);
66 void (*release)(void *iommu_data);
67 ssize_t (*read)(void *iommu_data, char __user *buf,
68 size_t count, loff_t *ppos);
69 ssize_t (*write)(void *iommu_data, const char __user *buf,
70 size_t count, loff_t *size);
71 long (*ioctl)(void *iommu_data, unsigned int cmd,
72 unsigned long arg);
73 int (*mmap)(void *iommu_data, struct vm_area_struct *vma);
74 int (*attach_group)(void *iommu_data,
75 struct iommu_group *group);
76 void (*detach_group)(void *iommu_data,
77 struct iommu_group *group);
78
79};
80
81extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
82
83extern void vfio_unregister_iommu_driver(
84 const struct vfio_iommu_driver_ops *ops);
85
86/*
87 * External user API
88 */
89extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
90extern void vfio_group_put_external_user(struct vfio_group *group);
91extern int vfio_external_user_iommu_id(struct vfio_group *group);
92extern long vfio_external_check_extension(struct vfio_group *group,
93 unsigned long arg);
94
95/*
96 * Sub-module helpers
97 */
98struct vfio_info_cap {
99 struct vfio_info_cap_header *buf;
100 size_t size;
101};
102extern struct vfio_info_cap_header *vfio_info_cap_add(
103 struct vfio_info_cap *caps, size_t size, u16 id, u16 version);
104extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
105
106struct pci_dev;
107#ifdef CONFIG_EEH
108extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
109extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
110extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
111 unsigned int cmd,
112 unsigned long arg);
113#else
114static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
115{
116}
117
118static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
119{
120}
121
122static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
123 unsigned int cmd,
124 unsigned long arg)
125{
126 return -ENOTTY;
127}
128#endif /* CONFIG_EEH */
129
130/*
131 * IRQfd - generic
132 */
133struct virqfd {
134 void *opaque;
135 struct eventfd_ctx *eventfd;
136 int (*handler)(void *, void *);
137 void (*thread)(void *, void *);
138 void *data;
139 struct work_struct inject;
140 wait_queue_t wait;
141 poll_table pt;
142 struct work_struct shutdown;
143 struct virqfd **pvirqfd;
144};
145
146extern int vfio_virqfd_enable(void *opaque,
147 int (*handler)(void *, void *),
148 void (*thread)(void *, void *),
149 void *data, struct virqfd **pvirqfd, int fd);
150extern void vfio_virqfd_disable(struct virqfd **pvirqfd);
151
152#endif /* VFIO_H */