drivers/vfio/pci/vfio_pci_private.h

   1 /*
   2  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
   3  *     Author: Alex Williamson <alex.williamson@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Derived from original vfio:
  10  * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
  11  * Author: Tom Lyon, pugs@cisco.com
  12  */
  13
  14 #include <linux/mutex.h>
  15 #include <linux/pci.h>
  16 #include <linux/irqbypass.h>
  17 #include <linux/types.h>
  18
  19 #ifndef VFIO_PCI_PRIVATE_H
  20 #define VFIO_PCI_PRIVATE_H
  21
  22 #define VFIO_PCI_OFFSET_SHIFT   40
  23
  24 #define VFIO_PCI_OFFSET_TO_INDEX(off)   (off >> VFIO_PCI_OFFSET_SHIFT)
  25 #define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
  26 #define VFIO_PCI_OFFSET_MASK    (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
  27
  28 /* Special capability IDs predefined access */
  29 #define PCI_CAP_ID_INVALID              0xFF    /* default raw access */
  30 #define PCI_CAP_ID_INVALID_VIRT         0xFE    /* default virt access */
  31
  32 /* Cap maximum number of ioeventfds per device (arbitrary) */
  33 #define VFIO_PCI_IOEVENTFD_MAX          1000
  34
  35 struct vfio_pci_ioeventfd {
  36         struct list_head        next;
  37         struct virqfd           *virqfd;
  38         void __iomem            *addr;
  39         uint64_t                data;
  40         loff_t                  pos;
  41         int                     bar;
  42         int                     count;
  43 };
  44
  45 struct vfio_pci_irq_ctx {
  46         struct eventfd_ctx      *trigger;
  47         struct virqfd           *unmask;
  48         struct virqfd           *mask;
  49         char                    *name;
  50         bool                    masked;
  51         struct irq_bypass_producer      producer;
  52 };
  53
  54 struct vfio_pci_device;
  55 struct vfio_pci_region;
  56
  57 struct vfio_pci_regops {
  58         size_t  (*rw)(struct vfio_pci_device *vdev, char __user *buf,
  59                       size_t count, loff_t *ppos, bool iswrite);
  60         void    (*release)(struct vfio_pci_device *vdev,
  61                            struct vfio_pci_region *region);
  62 };
  63
  64 struct vfio_pci_region {
  65         u32                             type;
  66         u32                             subtype;
  67         const struct vfio_pci_regops    *ops;
  68         void                            *data;
  69         size_t                          size;
  70         u32                             flags;
  71 };
  72
  73 struct vfio_pci_dummy_resource {
  74         struct resource         resource;
  75         int                     index;
  76         struct list_head        res_next;
  77 };
  78
  79 struct vfio_pci_device {
  80         struct pci_dev          *pdev;
  81         void __iomem            *barmap[PCI_STD_RESOURCE_END + 1];
  82         bool                    bar_mmap_supported[PCI_STD_RESOURCE_END + 1];
  83         u8                      *pci_config_map;
  84         u8                      *vconfig;
  85         struct perm_bits        *msi_perm;
  86         spinlock_t              irqlock;
  87         struct mutex            igate;
  88         struct vfio_pci_irq_ctx *ctx;
  89         int                     num_ctx;
  90         int                     irq_type;
  91         int                     num_regions;
  92         struct vfio_pci_region  *region;
  93         u8                      msi_qmax;
  94         u8                      msix_bar;
  95         u16                     msix_size;
  96         u32                     msix_offset;
  97         u32                     rbar[7];
  98         bool                    pci_2_3;
  99         bool                    virq_disabled;
 100         bool                    reset_works;
 101         bool                    extended_caps;
 102         bool                    bardirty;
 103         bool                    has_vga;
 104         bool                    needs_reset;
 105         bool                    nointx;
 106         struct pci_saved_state  *pci_saved_state;
 107         int                     refcnt;
 108         int                     ioeventfds_nr;
 109         struct eventfd_ctx      *err_trigger;
 110         struct eventfd_ctx      *req_trigger;
 111         struct list_head        dummy_resources_list;
 112         struct mutex            ioeventfds_lock;
 113         struct list_head        ioeventfds_list;
 114 };
 115
 116 #define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
 117 #define is_msi(vdev) (vdev->irq_type == VFIO_PCI_MSI_IRQ_INDEX)
 118 #define is_msix(vdev) (vdev->irq_type == VFIO_PCI_MSIX_IRQ_INDEX)
 119 #define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) || is_msix(vdev)))
 120 #define irq_is(vdev, type) (vdev->irq_type == type)
 121
 122 extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev);
 123 extern void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
 124
 125 extern int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev,
 126                                    uint32_t flags, unsigned index,
 127                                    unsigned start, unsigned count, void *data);
 128
 129 extern ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev,
 130                                   char __user *buf, size_t count,
 131                                   loff_t *ppos, bool iswrite);
 132
 133 extern ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
 134                                size_t count, loff_t *ppos, bool iswrite);
 135
 136 extern ssize_t vfio_pci_vga_rw(struct vfio_pci_device *vdev, char __user *buf,
 137                                size_t count, loff_t *ppos, bool iswrite);
 138
 139 extern long vfio_pci_ioeventfd(struct vfio_pci_device *vdev, loff_t offset,
 140                                uint64_t data, int count, int fd);
 141
 142 extern int vfio_pci_init_perm_bits(void);
 143 extern void vfio_pci_uninit_perm_bits(void);
 144
 145 extern int vfio_config_init(struct vfio_pci_device *vdev);
 146 extern void vfio_config_free(struct vfio_pci_device *vdev);
 147
 148 extern int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
 149                                         unsigned int type, unsigned int subtype,
 150                                         const struct vfio_pci_regops *ops,
 151                                         size_t size, u32 flags, void *data);
 152 #ifdef CONFIG_VFIO_PCI_IGD
 153 extern int vfio_pci_igd_init(struct vfio_pci_device *vdev);
 154 #else
 155 static inline int vfio_pci_igd_init(struct vfio_pci_device *vdev)
 156 {
 157         return -ENODEV;
 158 }
 159 #endif
 160 #endif /* VFIO_PCI_PRIVATE_H */