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TOMOYO Linux Cross Reference
Linux/include/linux/vfio.h

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  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 */
202 

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