1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Common functionality of grant device.
6 * Copyright (c) 2006-2007, D G Murray.
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;
25 * Maps that are not visible; will be freed on munmap.
26 * Only populated if populate_freeable_maps == 1
28 struct list_head freeable_maps;
29 /* lock protects maps and freeable_maps. */
32 struct mmu_notifier mn;
34 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
35 /* Device for which DMA memory is allocated. */
36 struct device *dma_dev;
39 #ifdef CONFIG_XEN_GNTDEV_DMABUF
40 struct gntdev_dmabuf_priv *dmabuf_priv;
44 struct gntdev_unmap_notify {
46 /* Address relative to the start of the gntdev_grant_map. */
51 struct gntdev_grant_map {
52 struct list_head next;
53 struct vm_area_struct *vma;
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;
65 unsigned long pages_vm_start;
67 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
69 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA
73 struct device *dma_dev;
74 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
77 dma_addr_t dma_bus_addr;
78 /* Needed to avoid allocation in gnttab_dma_free_pages(). */
83 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
86 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
88 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
90 bool gntdev_account_mapped_pages(int count);
92 int gntdev_map_grant_pages(struct gntdev_grant_map *map);