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