include/linux/vfio.h

   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  */
  33 struct 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
  47 extern struct iommu_group *vfio_iommu_group_get(struct device *dev);
  48 extern void vfio_iommu_group_put(struct iommu_group *group, struct device *dev);
  49
  50 extern int vfio_add_group_dev(struct device *dev,
  51                               const struct vfio_device_ops *ops,
  52                               void *device_data);
  53
  54 extern void *vfio_del_group_dev(struct device *dev);
  55 extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
  56 extern void vfio_device_put(struct vfio_device *device);
  57 extern void *vfio_device_data(struct vfio_device *device);
  58
  59 /**
  60  * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
  61  */
  62 struct 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
  81 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
  82
  83 extern void vfio_unregister_iommu_driver(
  84                                 const struct vfio_iommu_driver_ops *ops);
  85
  86 /*
  87  * External user API
  88  */
  89 extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
  90 extern void vfio_group_put_external_user(struct vfio_group *group);
  91 extern int vfio_external_user_iommu_id(struct vfio_group *group);
  92 extern long vfio_external_check_extension(struct vfio_group *group,
  93                                           unsigned long arg);
  94
  95 /*
  96  * Sub-module helpers
  97  */
  98 struct vfio_info_cap {
  99         struct vfio_info_cap_header *buf;
 100         size_t size;
 101 };
 102 extern struct vfio_info_cap_header *vfio_info_cap_add(
 103                 struct vfio_info_cap *caps, size_t size, u16 id, u16 version);
 104 extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
 105
 106 struct pci_dev;
 107 #ifdef CONFIG_EEH
 108 extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
 109 extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
 110 extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 111                                        unsigned int cmd,
 112                                        unsigned long arg);
 113 #else
 114 static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
 115 {
 116 }
 117
 118 static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
 119 {
 120 }
 121
 122 static 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  */
 133 struct 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
 146 extern int vfio_virqfd_enable(void *opaque,
 147                               int (*handler)(void *, void *),
 148                               void (*thread)(void *, void *),
 149                               void *data, struct virqfd **pvirqfd, int fd);
 150 extern void vfio_virqfd_disable(struct virqfd **pvirqfd);
 151
 152 #endif /* VFIO_H */