LXR linux/drivers/vfio/platform/vfio_platform

   1/*
   2 * Copyright (C) 2013 - Virtual Open Systems
   3 * Author: Antonios Motakis <a.motakis@virtualopensystems.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 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 */
  14
  15#ifndef VFIO_PLATFORM_PRIVATE_H
  16#define VFIO_PLATFORM_PRIVATE_H
  17
  18#include <linux/types.h>
  19#include <linux/interrupt.h>
  20
  21#define VFIO_PLATFORM_OFFSET_SHIFT   40
  22#define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1)
  23
  24#define VFIO_PLATFORM_OFFSET_TO_INDEX(off)      \
  25        (off >> VFIO_PLATFORM_OFFSET_SHIFT)
  26
  27#define VFIO_PLATFORM_INDEX_TO_OFFSET(index)    \
  28        ((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT)
  29
  30struct vfio_platform_irq {
  31        u32                     flags;
  32        u32                     count;
  33        int                     hwirq;
  34        char                    *name;
  35        struct eventfd_ctx      *trigger;
  36        bool                    masked;
  37        spinlock_t              lock;
  38        struct virqfd           *unmask;
  39        struct virqfd           *mask;
  40};
  41
  42struct vfio_platform_region {
  43        u64                     addr;
  44        resource_size_t         size;
  45        u32                     flags;
  46        u32                     type;
  47#define VFIO_PLATFORM_REGION_TYPE_MMIO  1
  48#define VFIO_PLATFORM_REGION_TYPE_PIO   2
  49        void __iomem            *ioaddr;
  50};
  51
  52struct vfio_platform_device {
  53        struct vfio_platform_region     *regions;
  54        u32                             num_regions;
  55        struct vfio_platform_irq        *irqs;
  56        u32                             num_irqs;
  57        int                             refcnt;
  58        struct mutex                    igate;
  59        struct module                   *parent_module;
  60        const char                      *compat;
  61        struct module                   *reset_module;
  62        struct device                   *device;
  63
  64        /*
  65         * These fields should be filled by the bus specific binder
  66         */
  67        void            *opaque;
  68        const char      *name;
  69        uint32_t        flags;
  70        /* callbacks to discover device resources */
  71        struct resource*
  72                (*get_resource)(struct vfio_platform_device *vdev, int i);
  73        int     (*get_irq)(struct vfio_platform_device *vdev, int i);
  74        int     (*reset)(struct vfio_platform_device *vdev);
  75};
  76
  77typedef int (*vfio_platform_reset_fn_t)(struct vfio_platform_device *vdev);
  78
  79struct vfio_platform_reset_node {
  80        struct list_head link;
  81        char *compat;
  82        struct module *owner;
  83        vfio_platform_reset_fn_t reset;
  84};
  85
  86extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
  87                                      struct device *dev);
  88extern struct vfio_platform_device *vfio_platform_remove_common
  89                                     (struct device *dev);
  90
  91extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
  92extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
  93
  94extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
  95                                        uint32_t flags, unsigned index,
  96                                        unsigned start, unsigned count,
  97                                        void *data);
  98
  99extern void __vfio_platform_register_reset(struct vfio_platform_reset_node *n);
 100extern void vfio_platform_unregister_reset(const char *compat,
 101                                           vfio_platform_reset_fn_t fn);
 102#define vfio_platform_register_reset(__compat, __reset)         \
 103static struct vfio_platform_reset_node __reset ## _node = {     \
 104        .owner = THIS_MODULE,                                   \
 105        .compat = __compat,                                     \
 106        .reset = __reset,                                       \
 107};                                                              \
 108__vfio_platform_register_reset(&__reset ## _node)
 109
 110#define module_vfio_reset_handler(compat, reset)                \
 111MODULE_ALIAS("vfio-reset:" compat);                             \
 112static int __init reset ## _module_init(void)                   \
 113{                                                               \
 114        vfio_platform_register_reset(compat, reset);            \
 115        return 0;                                               \
 116};                                                              \
 117static void __exit reset ## _module_exit(void)                  \
 118{                                                               \
 119        vfio_platform_unregister_reset(compat, reset);          \
 120};                                                              \
 121module_init(reset ## _module_init);                             \
 122module_exit(reset ## _module_exit)
 123
 124#endif /* VFIO_PLATFORM_PRIVATE_H */
 125