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 <uapi/linux/vfio.h>
  18
  19 /**
  20  * struct vfio_device_ops - VFIO bus driver device callbacks
  21  *
  22  * @open: Called when userspace creates new file descriptor for device
  23  * @release: Called when userspace releases file descriptor for device
  24  * @read: Perform read(2) on device file descriptor
  25  * @write: Perform write(2) on device file descriptor
  26  * @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
  27  *         operations documented below
  28  * @mmap: Perform mmap(2) on a region of the device file descriptor
  29  * @request: Request for the bus driver to release the device
  30  */
  31 struct vfio_device_ops {
  32         char    *name;
  33         int     (*open)(void *device_data);
  34         void    (*release)(void *device_data);
  35         ssize_t (*read)(void *device_data, char __user *buf,
  36                         size_t count, loff_t *ppos);
  37         ssize_t (*write)(void *device_data, const char __user *buf,
  38                          size_t count, loff_t *size);
  39         long    (*ioctl)(void *device_data, unsigned int cmd,
  40                          unsigned long arg);
  41         int     (*mmap)(void *device_data, struct vm_area_struct *vma);
  42         void    (*request)(void *device_data, unsigned int count);
  43 };
  44
  45 extern int vfio_add_group_dev(struct device *dev,
  46                               const struct vfio_device_ops *ops,
  47                               void *device_data);
  48
  49 extern void *vfio_del_group_dev(struct device *dev);
  50 extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
  51 extern void vfio_device_put(struct vfio_device *device);
  52 extern void *vfio_device_data(struct vfio_device *device);
  53
  54 /**
  55  * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
  56  */
  57 struct vfio_iommu_driver_ops {
  58         char            *name;
  59         struct module   *owner;
  60         void            *(*open)(unsigned long arg);
  61         void            (*release)(void *iommu_data);
  62         ssize_t         (*read)(void *iommu_data, char __user *buf,
  63                                 size_t count, loff_t *ppos);
  64         ssize_t         (*write)(void *iommu_data, const char __user *buf,
  65                                  size_t count, loff_t *size);
  66         long            (*ioctl)(void *iommu_data, unsigned int cmd,
  67                                  unsigned long arg);
  68         int             (*mmap)(void *iommu_data, struct vm_area_struct *vma);
  69         int             (*attach_group)(void *iommu_data,
  70                                         struct iommu_group *group);
  71         void            (*detach_group)(void *iommu_data,
  72                                         struct iommu_group *group);
  73
  74 };
  75
  76 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
  77
  78 extern void vfio_unregister_iommu_driver(
  79                                 const struct vfio_iommu_driver_ops *ops);
  80
  81 /**
  82  * offsetofend(TYPE, MEMBER)
  83  *
  84  * @TYPE: The type of the structure
  85  * @MEMBER: The member within the structure to get the end offset of
  86  *
  87  * Simple helper macro for dealing with variable sized structures passed
  88  * from user space.  This allows us to easily determine if the provided
  89  * structure is sized to include various fields.
  90  */
  91 #define offsetofend(TYPE, MEMBER) \
  92         (offsetof(TYPE, MEMBER) + sizeof(((TYPE *)0)->MEMBER))
  93
  94 /*
  95  * External user API
  96  */
  97 extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
  98 extern void vfio_group_put_external_user(struct vfio_group *group);
  99 extern int vfio_external_user_iommu_id(struct vfio_group *group);
 100 extern long vfio_external_check_extension(struct vfio_group *group,
 101                                           unsigned long arg);
 102
 103 struct pci_dev;
 104 #ifdef CONFIG_EEH
 105 extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
 106 extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
 107 extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 108                                        unsigned int cmd,
 109                                        unsigned long arg);
 110 #else
 111 static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
 112 {
 113 }
 114
 115 static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
 116 {
 117 }
 118
 119 static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 120                                               unsigned int cmd,
 121                                               unsigned long arg)
 122 {
 123         return -ENOTTY;
 124 }
 125 #endif /* CONFIG_EEH */
 126 #endif /* VFIO_H */