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
  19struct gntdev_dmabuf_priv;
  20
  21struct gntdev_priv {
  22        /* Maps with visible offsets in the file descriptor. */
  23        struct list_head maps;
  24        /*
  25         * Maps that are not visible; will be freed on munmap.
  26         * Only populated if populate_freeable_maps == 1
  27         */
  28        struct list_head freeable_maps;
  29        /* lock protects maps and freeable_maps. */
  30        struct mutex lock;
  31        struct mm_struct *mm;
  32        struct mmu_notifier mn;
  33
  34#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
  35        /* Device for which DMA memory is allocated. */
  36        struct device *dma_dev;
  37#endif
  38
  39#ifdef CONFIG_XEN_GNTDEV_DMABUF
  40        struct gntdev_dmabuf_priv *dmabuf_priv;
  41#endif
  42};
  43
  44struct gntdev_unmap_notify {
  45        int flags;
  46        /* Address relative to the start of the gntdev_grant_map. */
  47        int addr;
  48        int event;
  49};
  50
  51struct gntdev_grant_map {
  52        struct list_head next;
  53        struct vm_area_struct *vma;
  54        int index;
  55        int count;
  56        int flags;
  57        refcount_t users;
  58        struct gntdev_unmap_notify notify;
  59        struct ioctl_gntdev_grant_ref *grants;
  60        struct gnttab_map_grant_ref   *map_ops;
  61        struct gnttab_unmap_grant_ref *unmap_ops;
  62        struct gnttab_map_grant_ref   *kmap_ops;
  63        struct gnttab_unmap_grant_ref *kunmap_ops;
  64        struct page **pages;
  65        unsigned long pages_vm_start;
  66
  67#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
  68        /*
  69         * If dmabuf_vaddr is not NULL then this mapping is backed by DMA
  70         * capable memory.
  71         */
  72
  73        struct device *dma_dev;
  74        /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
  75        int dma_flags;
  76        void *dma_vaddr;
  77        dma_addr_t dma_bus_addr;
  78        /* Needed to avoid allocation in gnttab_dma_free_pages(). */
  79        xen_pfn_t *frames;
  80#endif
  81};
  82
  83struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
  84                                          int dma_flags);
  85
  86void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
  87
  88void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
  89
  90bool gntdev_account_mapped_pages(int count);
  91
  92int gntdev_map_grant_pages(struct gntdev_grant_map *map);
  93
  94#endif
  95