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