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 int vfio_add_group_dev(struct device *dev,
  48                               const struct vfio_device_ops *ops,
  49                               void *device_data);
  50
  51 extern void *vfio_del_group_dev(struct device *dev);
  52 extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
  53 extern void vfio_device_put(struct vfio_device *device);
  54 extern void *vfio_device_data(struct vfio_device *device);
  55
  56 /**
  57  * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
  58  */
  59 struct vfio_iommu_driver_ops {
  60         char            *name;
  61         struct module   *owner;
  62         void            *(*open)(unsigned long arg);
  63         void            (*release)(void *iommu_data);
  64         ssize_t         (*read)(void *iommu_data, char __user *buf,
  65                                 size_t count, loff_t *ppos);
  66         ssize_t         (*write)(void *iommu_data, const char __user *buf,
  67                                  size_t count, loff_t *size);
  68         long            (*ioctl)(void *iommu_data, unsigned int cmd,
  69                                  unsigned long arg);
  70         int             (*mmap)(void *iommu_data, struct vm_area_struct *vma);
  71         int             (*attach_group)(void *iommu_data,
  72                                         struct iommu_group *group);
  73         void            (*detach_group)(void *iommu_data,
  74                                         struct iommu_group *group);
  75
  76 };
  77
  78 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
  79
  80 extern void vfio_unregister_iommu_driver(
  81                                 const struct vfio_iommu_driver_ops *ops);
  82
  83 /*
  84  * External user API
  85  */
  86 extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
  87 extern void vfio_group_put_external_user(struct vfio_group *group);
  88 extern int vfio_external_user_iommu_id(struct vfio_group *group);
  89 extern long vfio_external_check_extension(struct vfio_group *group,
  90                                           unsigned long arg);
  91
  92 struct pci_dev;
  93 #ifdef CONFIG_EEH
  94 extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
  95 extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
  96 extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
  97                                        unsigned int cmd,
  98                                        unsigned long arg);
  99 #else
 100 static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
 101 {
 102 }
 103
 104 static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
 105 {
 106 }
 107
 108 static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 109                                               unsigned int cmd,
 110                                               unsigned long arg)
 111 {
 112         return -ENOTTY;
 113 }
 114 #endif /* CONFIG_EEH */
 115
 116 /*
 117  * IRQfd - generic
 118  */
 119 struct virqfd {
 120         void                    *opaque;
 121         struct eventfd_ctx      *eventfd;
 122         int                     (*handler)(void *, void *);
 123         void                    (*thread)(void *, void *);
 124         void                    *data;
 125         struct work_struct      inject;
 126         wait_queue_t            wait;
 127         poll_table              pt;
 128         struct work_struct      shutdown;
 129         struct virqfd           **pvirqfd;
 130 };
 131
 132 extern int vfio_virqfd_enable(void *opaque,
 133                               int (*handler)(void *, void *),
 134                               void (*thread)(void *, void *),
 135                               void *data, struct virqfd **pvirqfd, int fd);
 136 extern void vfio_virqfd_disable(struct virqfd **pvirqfd);
 137
 138 #endif /* VFIO_H */