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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> | |
0102e4ef | 18 | #include <xen/interface/event_channel.h> |
1d314567 | 19 | |
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20 | struct gntdev_dmabuf_priv; |
21 | ||
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22 | struct gntdev_priv { |
23 | /* Maps with visible offsets in the file descriptor. */ | |
24 | struct list_head maps; | |
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25 | /* lock protects maps and freeable_maps. */ |
26 | struct mutex lock; | |
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27 | |
28 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC | |
29 | /* Device for which DMA memory is allocated. */ | |
30 | struct device *dma_dev; | |
31 | #endif | |
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32 | |
33 | #ifdef CONFIG_XEN_GNTDEV_DMABUF | |
34 | struct gntdev_dmabuf_priv *dmabuf_priv; | |
35 | #endif | |
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36 | }; |
37 | ||
38 | struct gntdev_unmap_notify { | |
39 | int flags; | |
40 | /* Address relative to the start of the gntdev_grant_map. */ | |
41 | int addr; | |
0102e4ef | 42 | evtchn_port_t event; |
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43 | }; |
44 | ||
45 | struct gntdev_grant_map { | |
d3eeb1d7 | 46 | struct mmu_interval_notifier notifier; |
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47 | struct list_head next; |
48 | struct vm_area_struct *vma; | |
49 | int index; | |
50 | int count; | |
51 | int flags; | |
52 | refcount_t users; | |
53 | struct gntdev_unmap_notify notify; | |
54 | struct ioctl_gntdev_grant_ref *grants; | |
55 | struct gnttab_map_grant_ref *map_ops; | |
56 | struct gnttab_unmap_grant_ref *unmap_ops; | |
57 | struct gnttab_map_grant_ref *kmap_ops; | |
58 | struct gnttab_unmap_grant_ref *kunmap_ops; | |
59 | struct page **pages; | |
60 | unsigned long pages_vm_start; | |
61 | ||
62 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC | |
63 | /* | |
64 | * If dmabuf_vaddr is not NULL then this mapping is backed by DMA | |
65 | * capable memory. | |
66 | */ | |
67 | ||
68 | struct device *dma_dev; | |
69 | /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ | |
70 | int dma_flags; | |
71 | void *dma_vaddr; | |
72 | dma_addr_t dma_bus_addr; | |
73 | /* Needed to avoid allocation in gnttab_dma_free_pages(). */ | |
74 | xen_pfn_t *frames; | |
75 | #endif | |
76 | }; | |
77 | ||
78 | struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, | |
79 | int dma_flags); | |
80 | ||
81 | void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); | |
82 | ||
83 | void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); | |
84 | ||
3b06ac67 | 85 | bool gntdev_test_page_count(unsigned int count); |
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86 | |
87 | int gntdev_map_grant_pages(struct gntdev_grant_map *map); | |
88 | ||
89 | #endif |