include/linux/vfio.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * VFIO API definition
   4  *
   5  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
   6  *     Author: Alex Williamson <alex.williamson@redhat.com>
   7  */
   8 #ifndef VFIO_H
   9 #define VFIO_H
  10
  11
  12 #include <linux/iommu.h>
  13 #include <linux/mm.h>
  14 #include <linux/workqueue.h>
  15 #include <linux/poll.h>
  16 #include <uapi/linux/vfio.h>
  17
  18 struct vfio_device {
  19         struct device *dev;
  20         const struct vfio_device_ops *ops;
  21         struct vfio_group *group;
  22
  23         /* Members below here are private, not for driver use */
  24         refcount_t refcount;
  25         struct completion comp;
  26         struct list_head group_next;
  27 };
  28
  29 /**
  30  * struct vfio_device_ops - VFIO bus driver device callbacks
  31  *
  32  * @open: Called when userspace creates new file descriptor for device
  33  * @release: Called when userspace releases file descriptor for device
  34  * @read: Perform read(2) on device file descriptor
  35  * @write: Perform write(2) on device file descriptor
  36  * @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
  37  *         operations documented below
  38  * @mmap: Perform mmap(2) on a region of the device file descriptor
  39  * @request: Request for the bus driver to release the device
  40  * @match: Optional device name match callback (return: 0 for no-match, >0 for
  41  *         match, -errno for abort (ex. match with insufficient or incorrect
  42  *         additional args)
  43  */
  44 struct vfio_device_ops {
  45         char    *name;
  46         int     (*open)(struct vfio_device *vdev);
  47         void    (*release)(struct vfio_device *vdev);
  48         ssize_t (*read)(struct vfio_device *vdev, char __user *buf,
  49                         size_t count, loff_t *ppos);
  50         ssize_t (*write)(struct vfio_device *vdev, const char __user *buf,
  51                          size_t count, loff_t *size);
  52         long    (*ioctl)(struct vfio_device *vdev, unsigned int cmd,
  53                          unsigned long arg);
  54         int     (*mmap)(struct vfio_device *vdev, struct vm_area_struct *vma);
  55         void    (*request)(struct vfio_device *vdev, unsigned int count);
  56         int     (*match)(struct vfio_device *vdev, char *buf);
  57 };
  58
  59 extern struct iommu_group *vfio_iommu_group_get(struct device *dev);
  60 extern void vfio_iommu_group_put(struct iommu_group *group, struct device *dev);
  61
  62 void vfio_init_group_dev(struct vfio_device *device, struct device *dev,
  63                          const struct vfio_device_ops *ops);
  64 int vfio_register_group_dev(struct vfio_device *device);
  65 void vfio_unregister_group_dev(struct vfio_device *device);
  66 extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
  67 extern void vfio_device_put(struct vfio_device *device);
  68
  69 /* events for the backend driver notify callback */
  70 enum vfio_iommu_notify_type {
  71         VFIO_IOMMU_CONTAINER_CLOSE = 0,
  72 };
  73
  74 /**
  75  * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
  76  */
  77 struct vfio_iommu_driver_ops {
  78         char            *name;
  79         struct module   *owner;
  80         void            *(*open)(unsigned long arg);
  81         void            (*release)(void *iommu_data);
  82         ssize_t         (*read)(void *iommu_data, char __user *buf,
  83                                 size_t count, loff_t *ppos);
  84         ssize_t         (*write)(void *iommu_data, const char __user *buf,
  85                                  size_t count, loff_t *size);
  86         long            (*ioctl)(void *iommu_data, unsigned int cmd,
  87                                  unsigned long arg);
  88         int             (*mmap)(void *iommu_data, struct vm_area_struct *vma);
  89         int             (*attach_group)(void *iommu_data,
  90                                         struct iommu_group *group);
  91         void            (*detach_group)(void *iommu_data,
  92                                         struct iommu_group *group);
  93         int             (*pin_pages)(void *iommu_data,
  94                                      struct iommu_group *group,
  95                                      unsigned long *user_pfn,
  96                                      int npage, int prot,
  97                                      unsigned long *phys_pfn);
  98         int             (*unpin_pages)(void *iommu_data,
  99                                        unsigned long *user_pfn, int npage);
 100         int             (*register_notifier)(void *iommu_data,
 101                                              unsigned long *events,
 102                                              struct notifier_block *nb);
 103         int             (*unregister_notifier)(void *iommu_data,
 104                                                struct notifier_block *nb);
 105         int             (*dma_rw)(void *iommu_data, dma_addr_t user_iova,
 106                                   void *data, size_t count, bool write);
 107         struct iommu_domain *(*group_iommu_domain)(void *iommu_data,
 108                                                    struct iommu_group *group);
 109         void            (*notify)(void *iommu_data,
 110                                   enum vfio_iommu_notify_type event);
 111 };
 112
 113 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
 114
 115 extern void vfio_unregister_iommu_driver(
 116                                 const struct vfio_iommu_driver_ops *ops);
 117
 118 /*
 119  * External user API
 120  */
 121 extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
 122 extern void vfio_group_put_external_user(struct vfio_group *group);
 123 extern struct vfio_group *vfio_group_get_external_user_from_dev(struct device
 124                                                                 *dev);
 125 extern bool vfio_external_group_match_file(struct vfio_group *group,
 126                                            struct file *filep);
 127 extern int vfio_external_user_iommu_id(struct vfio_group *group);
 128 extern long vfio_external_check_extension(struct vfio_group *group,
 129                                           unsigned long arg);
 130
 131 #define VFIO_PIN_PAGES_MAX_ENTRIES      (PAGE_SIZE/sizeof(unsigned long))
 132
 133 extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
 134                           int npage, int prot, unsigned long *phys_pfn);
 135 extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
 136                             int npage);
 137
 138 extern int vfio_group_pin_pages(struct vfio_group *group,
 139                                 unsigned long *user_iova_pfn, int npage,
 140                                 int prot, unsigned long *phys_pfn);
 141 extern int vfio_group_unpin_pages(struct vfio_group *group,
 142                                   unsigned long *user_iova_pfn, int npage);
 143
 144 extern int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova,
 145                        void *data, size_t len, bool write);
 146
 147 extern struct iommu_domain *vfio_group_iommu_domain(struct vfio_group *group);
 148
 149 /* each type has independent events */
 150 enum vfio_notify_type {
 151         VFIO_IOMMU_NOTIFY = 0,
 152         VFIO_GROUP_NOTIFY = 1,
 153 };
 154
 155 /* events for VFIO_IOMMU_NOTIFY */
 156 #define VFIO_IOMMU_NOTIFY_DMA_UNMAP     BIT(0)
 157
 158 /* events for VFIO_GROUP_NOTIFY */
 159 #define VFIO_GROUP_NOTIFY_SET_KVM       BIT(0)
 160
 161 extern int vfio_register_notifier(struct device *dev,
 162                                   enum vfio_notify_type type,
 163                                   unsigned long *required_events,
 164                                   struct notifier_block *nb);
 165 extern int vfio_unregister_notifier(struct device *dev,
 166                                     enum vfio_notify_type type,
 167                                     struct notifier_block *nb);
 168
 169 struct kvm;
 170 extern void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
 171
 172 /*
 173  * Sub-module helpers
 174  */
 175 struct vfio_info_cap {
 176         struct vfio_info_cap_header *buf;
 177         size_t size;
 178 };
 179 extern struct vfio_info_cap_header *vfio_info_cap_add(
 180                 struct vfio_info_cap *caps, size_t size, u16 id, u16 version);
 181 extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
 182
 183 extern int vfio_info_add_capability(struct vfio_info_cap *caps,
 184                                     struct vfio_info_cap_header *cap,
 185                                     size_t size);
 186
 187 extern int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
 188                                               int num_irqs, int max_irq_type,
 189                                               size_t *data_size);
 190
 191 struct pci_dev;
 192 #if IS_ENABLED(CONFIG_VFIO_SPAPR_EEH)
 193 extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
 194 extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
 195 extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 196                                        unsigned int cmd,
 197                                        unsigned long arg);
 198 #else
 199 static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
 200 {
 201 }
 202
 203 static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
 204 {
 205 }
 206
 207 static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 208                                               unsigned int cmd,
 209                                               unsigned long arg)
 210 {
 211         return -ENOTTY;
 212 }
 213 #endif /* CONFIG_VFIO_SPAPR_EEH */
 214
 215 /*
 216  * IRQfd - generic
 217  */
 218 struct virqfd {
 219         void                    *opaque;
 220         struct eventfd_ctx      *eventfd;
 221         int                     (*handler)(void *, void *);
 222         void                    (*thread)(void *, void *);
 223         void                    *data;
 224         struct work_struct      inject;
 225         wait_queue_entry_t              wait;
 226         poll_table              pt;
 227         struct work_struct      shutdown;
 228         struct virqfd           **pvirqfd;
 229 };
 230
 231 extern int vfio_virqfd_enable(void *opaque,
 232                               int (*handler)(void *, void *),
 233                               void (*thread)(void *, void *),
 234                               void *data, struct virqfd **pvirqfd, int fd);
 235 extern void vfio_virqfd_disable(struct virqfd **pvirqfd);
 236
 237 #endif /* VFIO_H */