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 | #include <xen/interface/event_channel.h> |
19 | #include <xen/grant_table.h> |
20 | |
21 | struct gntdev_dmabuf_priv; |
22 | |
23 | struct gntdev_priv { |
24 | /* Maps with visible offsets in the file descriptor. */ |
25 | struct list_head maps; |
26 | /* lock protects maps and freeable_maps. */ |
27 | struct mutex lock; |
28 | |
29 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
30 | /* Device for which DMA memory is allocated. */ |
31 | struct device *dma_dev; |
32 | #endif |
33 | |
34 | #ifdef CONFIG_XEN_GNTDEV_DMABUF |
35 | struct gntdev_dmabuf_priv *dmabuf_priv; |
36 | #endif |
37 | }; |
38 | |
39 | struct gntdev_unmap_notify { |
40 | int flags; |
41 | /* Address relative to the start of the gntdev_grant_map. */ |
42 | int addr; |
43 | evtchn_port_t event; |
44 | }; |
45 | |
46 | struct gntdev_grant_map { |
47 | atomic_t in_use; |
48 | struct mmu_interval_notifier notifier; |
49 | bool notifier_init; |
50 | struct list_head next; |
51 | int index; |
52 | int count; |
53 | int flags; |
54 | refcount_t users; |
55 | struct gntdev_unmap_notify notify; |
56 | struct ioctl_gntdev_grant_ref *grants; |
57 | struct gnttab_map_grant_ref *map_ops; |
58 | struct gnttab_unmap_grant_ref *unmap_ops; |
59 | struct gnttab_map_grant_ref *kmap_ops; |
60 | struct gnttab_unmap_grant_ref *kunmap_ops; |
61 | bool *being_removed; |
62 | struct page **pages; |
63 | unsigned long pages_vm_start; |
64 | |
65 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
66 | /* |
67 | * If dmabuf_vaddr is not NULL then this mapping is backed by DMA |
68 | * capable memory. |
69 | */ |
70 | |
71 | struct device *dma_dev; |
72 | /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */ |
73 | int dma_flags; |
74 | void *dma_vaddr; |
75 | dma_addr_t dma_bus_addr; |
76 | /* Needed to avoid allocation in gnttab_dma_free_pages(). */ |
77 | xen_pfn_t *frames; |
78 | #endif |
79 | |
80 | /* Number of live grants */ |
81 | atomic_t live_grants; |
82 | /* Needed to avoid allocation in __unmap_grant_pages */ |
83 | struct gntab_unmap_queue_data unmap_data; |
84 | }; |
85 | |
86 | struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count, |
87 | int dma_flags); |
88 | |
89 | void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add); |
90 | |
91 | void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map); |
92 | |
93 | bool gntdev_test_page_count(unsigned int count); |
94 | |
95 | int gntdev_map_grant_pages(struct gntdev_grant_map *map); |
96 | |
97 | #endif |
98 |