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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#include <xen/interface/event_channel.h>
19#include <xen/grant_table.h>
20
21struct gntdev_dmabuf_priv;
22
23struct 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 /* Free instances of struct gntdev_copy_batch. */
30 struct gntdev_copy_batch *batch;
31 struct mutex batch_lock;
32
33#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
34 /* Device for which DMA memory is allocated. */
35 struct device *dma_dev;
36#endif
37
38#ifdef CONFIG_XEN_GNTDEV_DMABUF
39 struct gntdev_dmabuf_priv *dmabuf_priv;
40#endif
41};
42
43struct gntdev_unmap_notify {
44 int flags;
45 /* Address relative to the start of the gntdev_grant_map. */
46 int addr;
47 evtchn_port_t event;
48};
49
50struct gntdev_grant_map {
51 atomic_t in_use;
52 struct mmu_interval_notifier notifier;
53 bool notifier_init;
54 struct list_head next;
55 int index;
56 int count;
57 int flags;
58 refcount_t users;
59 struct gntdev_unmap_notify notify;
60 struct ioctl_gntdev_grant_ref *grants;
61 struct gnttab_map_grant_ref *map_ops;
62 struct gnttab_unmap_grant_ref *unmap_ops;
63 struct gnttab_map_grant_ref *kmap_ops;
64 struct gnttab_unmap_grant_ref *kunmap_ops;
65 bool *being_removed;
66 struct page **pages;
67 unsigned long pages_vm_start;
68
69#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
70 /*
71 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA
72 * capable memory.
73 */
74
75 struct device *dma_dev;
76 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
77 int dma_flags;
78 void *dma_vaddr;
79 dma_addr_t dma_bus_addr;
80 /* Needed to avoid allocation in gnttab_dma_free_pages(). */
81 xen_pfn_t *frames;
82#endif
83
84 /* Number of live grants */
85 atomic_t live_grants;
86 /* Needed to avoid allocation in __unmap_grant_pages */
87 struct gntab_unmap_queue_data unmap_data;
88};
89
90struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
91 int dma_flags);
92
93void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
94
95void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
96
97bool gntdev_test_page_count(unsigned int count);
98
99int gntdev_map_grant_pages(struct gntdev_grant_map *map);
100
101#endif