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>
18 #include <xen/interface/event_channel.h>
19 #include <xen/grant_table.h>
21 struct gntdev_dmabuf_priv;
24 /* Maps with visible offsets in the file descriptor. */
25 struct list_head maps;
27 * Maps that are not visible; will be freed on munmap.
28 * Only populated if populate_freeable_maps == 1
30 struct list_head freeable_maps;
31 /* lock protects maps and freeable_maps. */
34 struct mmu_notifier mn;
36 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
37 /* Device for which DMA memory is allocated. */
38 struct device *dma_dev;
41 #ifdef CONFIG_XEN_GNTDEV_DMABUF
42 struct gntdev_dmabuf_priv *dmabuf_priv;
46 struct gntdev_unmap_notify {
48 /* Address relative to the start of the gntdev_grant_map. */
53 struct gntdev_grant_map {
54 struct list_head next;
55 struct vm_area_struct *vma;
60 struct gntdev_unmap_notify notify;
61 struct ioctl_gntdev_grant_ref *grants;
62 struct gnttab_map_grant_ref *map_ops;
63 struct gnttab_unmap_grant_ref *unmap_ops;
64 struct gnttab_map_grant_ref *kmap_ops;
65 struct gnttab_unmap_grant_ref *kunmap_ops;
68 unsigned long pages_vm_start;
70 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
72 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA
76 struct device *dma_dev;
77 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
80 dma_addr_t dma_bus_addr;
81 /* Needed to avoid allocation in gnttab_dma_free_pages(). */
85 /* Number of live grants */
87 /* Needed to avoid allocation in __unmap_grant_pages */
88 struct gntab_unmap_queue_data unmap_data;
91 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
94 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
96 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
98 bool gntdev_account_mapped_pages(int count);
100 int gntdev_map_grant_pages(struct gntdev_grant_map *map);