LXR linux/drivers/xen/gntdev-common.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2
   3/*
   4 * Common functionality of grant device.
   5 *
   6 * Copyright (c) 2006-2007, D G Murray.
   7 *           (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
   8 *           (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
   9 */
  10
  11#ifndef _GNTDEV_COMMON_H
  12#define _GNTDEV_COMMON_H
  13
  14#include <linux/mm.h>
  15#include <linux/mman.h>
  16#include <linux/mmu_notifier.h>
  17#include <linux/types.h>
  18#include <xen/interface/event_channel.h>
  19
  20struct gntdev_dmabuf_priv;
  21
  22struct gntdev_priv {
  23        /* Maps with visible offsets in the file descriptor. */
  24        struct list_head maps;
  25        /* lock protects maps and freeable_maps. */
  26        struct mutex lock;
  27
  28#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
  29        /* Device for which DMA memory is allocated. */
  30        struct device *dma_dev;
  31#endif
  32
  33#ifdef CONFIG_XEN_GNTDEV_DMABUF
  34        struct gntdev_dmabuf_priv *dmabuf_priv;
  35#endif
  36};
  37
  38struct gntdev_unmap_notify {
  39        int flags;
  40        /* Address relative to the start of the gntdev_grant_map. */
  41        int addr;
  42        evtchn_port_t event;
  43};
  44
  45struct gntdev_grant_map {
  46        struct mmu_interval_notifier notifier;
  47        struct list_head next;
  48        struct vm_area_struct *vma;
  49        int index;
  50        int count;
  51        int flags;
  52        refcount_t users;
  53        struct gntdev_unmap_notify notify;
  54        struct ioctl_gntdev_grant_ref *grants;
  55        struct gnttab_map_grant_ref   *map_ops;
  56        struct gnttab_unmap_grant_ref *unmap_ops;
  57        struct gnttab_map_grant_ref   *kmap_ops;
  58        struct gnttab_unmap_grant_ref *kunmap_ops;
  59        struct page **pages;
  60        unsigned long pages_vm_start;
  61
  62#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
  63        /*
  64         * If dmabuf_vaddr is not NULL then this mapping is backed by DMA
  65         * capable memory.
  66         */
  67
  68        struct device *dma_dev;
  69        /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
  70        int dma_flags;
  71        void *dma_vaddr;
  72        dma_addr_t dma_bus_addr;
  73        /* Needed to avoid allocation in gnttab_dma_free_pages(). */
  74        xen_pfn_t *frames;
  75#endif
  76};
  77
  78struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
  79                                          int dma_flags);
  80
  81void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
  82
  83void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
  84
  85bool gntdev_test_page_count(unsigned int count);
  86
  87int gntdev_map_grant_pages(struct gntdev_grant_map *map);
  88
  89#endif
  90