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         int             (*pin_pages)(void *iommu_data, unsigned long *user_pfn,
  79                                      int npage, int prot,
  80                                      unsigned long *phys_pfn);
  81         int             (*unpin_pages)(void *iommu_data,
  82                                        unsigned long *user_pfn, int npage);
  83         int             (*register_notifier)(void *iommu_data,
  84                                              unsigned long *events,
  85                                              struct notifier_block *nb);
  86         int             (*unregister_notifier)(void *iommu_data,
  87                                                struct notifier_block *nb);
  88 };
  89
  90 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
  91
  92 extern void vfio_unregister_iommu_driver(
  93                                 const struct vfio_iommu_driver_ops *ops);
  94
  95 /*
  96  * External user API
  97  */
  98 extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
  99 extern void vfio_group_put_external_user(struct vfio_group *group);
 100 extern bool vfio_external_group_match_file(struct vfio_group *group,
 101                                            struct file *filep);
 102 extern int vfio_external_user_iommu_id(struct vfio_group *group);
 103 extern long vfio_external_check_extension(struct vfio_group *group,
 104                                           unsigned long arg);
 105
 106 #define VFIO_PIN_PAGES_MAX_ENTRIES      (PAGE_SIZE/sizeof(unsigned long))
 107
 108 extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
 109                           int npage, int prot, unsigned long *phys_pfn);
 110 extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
 111                             int npage);
 112
 113 /* each type has independent events */
 114 enum vfio_notify_type {
 115         VFIO_IOMMU_NOTIFY = 0,
 116         VFIO_GROUP_NOTIFY = 1,
 117 };
 118
 119 /* events for VFIO_IOMMU_NOTIFY */
 120 #define VFIO_IOMMU_NOTIFY_DMA_UNMAP     BIT(0)
 121
 122 /* events for VFIO_GROUP_NOTIFY */
 123 #define VFIO_GROUP_NOTIFY_SET_KVM       BIT(0)
 124
 125 extern int vfio_register_notifier(struct device *dev,
 126                                   enum vfio_notify_type type,
 127                                   unsigned long *required_events,
 128                                   struct notifier_block *nb);
 129 extern int vfio_unregister_notifier(struct device *dev,
 130                                     enum vfio_notify_type type,
 131                                     struct notifier_block *nb);
 132
 133 struct kvm;
 134 extern void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
 135
 136 /*
 137  * Sub-module helpers
 138  */
 139 struct vfio_info_cap {
 140         struct vfio_info_cap_header *buf;
 141         size_t size;
 142 };
 143 extern struct vfio_info_cap_header *vfio_info_cap_add(
 144                 struct vfio_info_cap *caps, size_t size, u16 id, u16 version);
 145 extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
 146
 147 extern int vfio_info_add_capability(struct vfio_info_cap *caps,
 148                                     struct vfio_info_cap_header *cap,
 149                                     size_t size);
 150
 151 extern int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
 152                                               int num_irqs, int max_irq_type,
 153                                               size_t *data_size);
 154
 155 struct pci_dev;
 156 #if IS_ENABLED(CONFIG_VFIO_SPAPR_EEH)
 157 extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
 158 extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
 159 extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 160                                        unsigned int cmd,
 161                                        unsigned long arg);
 162 #else
 163 static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
 164 {
 165 }
 166
 167 static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
 168 {
 169 }
 170
 171 static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 172                                               unsigned int cmd,
 173                                               unsigned long arg)
 174 {
 175         return -ENOTTY;
 176 }
 177 #endif /* CONFIG_VFIO_SPAPR_EEH */
 178
 179 /*
 180  * IRQfd - generic
 181  */
 182 struct virqfd {
 183         void                    *opaque;
 184         struct eventfd_ctx      *eventfd;
 185         int                     (*handler)(void *, void *);
 186         void                    (*thread)(void *, void *);
 187         void                    *data;
 188         struct work_struct      inject;
 189         wait_queue_entry_t              wait;
 190         poll_table              pt;
 191         struct work_struct      shutdown;
 192         struct virqfd           **pvirqfd;
 193 };
 194
 195 extern int vfio_virqfd_enable(void *opaque,
 196                               int (*handler)(void *, void *),
 197                               void (*thread)(void *, void *),
 198                               void *data, struct virqfd **pvirqfd, int fd);
 199 extern void vfio_virqfd_disable(struct virqfd **pvirqfd);
 200
 201 #endif /* VFIO_H */