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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 | ||
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19 | struct gntdev_dmabuf_priv; |
20 | ||
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21 | struct 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 | |
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38 | |
39 | #ifdef CONFIG_XEN_GNTDEV_DMABUF | |
40 | struct gntdev_dmabuf_priv *dmabuf_priv; | |
41 | #endif | |
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42 | }; |
43 | ||
44 | struct 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 | ||
51 | struct 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 | ||
83 | struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, | |
84 | int dma_flags); | |
85 | ||
86 | void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); | |
87 | ||
88 | void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); | |
89 | ||
90 | bool gntdev_account_mapped_pages(int count); | |
91 | ||
92 | int gntdev_map_grant_pages(struct gntdev_grant_map *map); | |
93 | ||
94 | #endif |