drivers/vfio/platform/vfio_platform_private.h

   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
  30 struct 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
  42 struct 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
  52 struct 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
  63         /*
  64          * These fields should be filled by the bus specific binder
  65          */
  66         void            *opaque;
  67         const char      *name;
  68         uint32_t        flags;
  69         /* callbacks to discover device resources */
  70         struct resource*
  71                 (*get_resource)(struct vfio_platform_device *vdev, int i);
  72         int     (*get_irq)(struct vfio_platform_device *vdev, int i);
  73         int     (*reset)(struct vfio_platform_device *vdev);
  74 };
  75
  76 typedef int (*vfio_platform_reset_fn_t)(struct vfio_platform_device *vdev);
  77
  78 struct vfio_platform_reset_node {
  79         struct list_head link;
  80         char *compat;
  81         struct module *owner;
  82         vfio_platform_reset_fn_t reset;
  83 };
  84
  85 extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
  86                                       struct device *dev);
  87 extern struct vfio_platform_device *vfio_platform_remove_common
  88                                      (struct device *dev);
  89
  90 extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
  91 extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
  92
  93 extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
  94                                         uint32_t flags, unsigned index,
  95                                         unsigned start, unsigned count,
  96                                         void *data);
  97
  98 extern void __vfio_platform_register_reset(struct vfio_platform_reset_node *n);
  99 extern void vfio_platform_unregister_reset(const char *compat,
 100                                            vfio_platform_reset_fn_t fn);
 101 #define vfio_platform_register_reset(__compat, __reset)         \
 102 static struct vfio_platform_reset_node __reset ## _node = {     \
 103         .owner = THIS_MODULE,                                   \
 104         .compat = __compat,                                     \
 105         .reset = __reset,                                       \
 106 };                                                              \
 107 __vfio_platform_register_reset(&__reset ## _node)
 108
 109 #define module_vfio_reset_handler(compat, reset)                \
 110 MODULE_ALIAS("vfio-reset:" compat);                             \
 111 static int __init reset ## _module_init(void)                   \
 112 {                                                               \
 113         vfio_platform_register_reset(compat, reset);            \
 114         return 0;                                               \
 115 };                                                              \
 116 static void __exit reset ## _module_exit(void)                  \
 117 {                                                               \
 118         vfio_platform_unregister_reset(compat, reset);          \
 119 };                                                              \
 120 module_init(reset ## _module_init);                             \
 121 module_exit(reset ## _module_exit)
 122
 123 #endif /* VFIO_PLATFORM_PRIVATE_H */