1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Common functionality of grant device.
6 * Copyright (c) 2006-2007, D G Murray.
7 * (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
8 * (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
11 #ifndef _GNTDEV_COMMON_H
12 #define _GNTDEV_COMMON_H
15 #include <linux/mman.h>
16 #include <linux/mmu_notifier.h>
17 #include <linux/types.h>
19 struct gntdev_dmabuf_priv;
22 /* Maps with visible offsets in the file descriptor. */
23 struct list_head maps;
24 /* lock protects maps and freeable_maps. */
27 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
28 /* Device for which DMA memory is allocated. */
29 struct device *dma_dev;
32 #ifdef CONFIG_XEN_GNTDEV_DMABUF
33 struct gntdev_dmabuf_priv *dmabuf_priv;
37 struct gntdev_unmap_notify {
39 /* Address relative to the start of the gntdev_grant_map. */
44 struct gntdev_grant_map {
45 struct mmu_interval_notifier notifier;
46 struct list_head next;
47 struct vm_area_struct *vma;
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;
59 unsigned long pages_vm_start;
61 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
63 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA
67 struct device *dma_dev;
68 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
71 dma_addr_t dma_bus_addr;
72 /* Needed to avoid allocation in gnttab_dma_free_pages(). */
77 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
80 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
82 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
84 bool gntdev_test_page_count(unsigned int count);
86 int gntdev_map_grant_pages(struct gntdev_grant_map *map);