summaryrefslogblamecommitdiff
path: root/include/linux/dma-heap.h
blob: 454e354d1ffb7e10ab62bafe36d147b58d56aba9 (plain) (tree) 
c02a81fba74f ^



























































1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59



























































                                                                               
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * DMABUF Heaps Allocation Infrastructure
 *
 * Copyright (C) 2011 Google, Inc.
 * Copyright (C) 2019 Linaro Ltd.
 */

#ifndef _DMA_HEAPS_H
#define _DMA_HEAPS_H

#include <linux/cdev.h>
#include <linux/types.h>

struct dma_heap;

/**
 * struct dma_heap_ops - ops to operate on a given heap
 * @allocate:		allocate dmabuf and return fd
 *
 * allocate returns dmabuf fd  on success, -errno on error.
 */
struct dma_heap_ops {
	int (*allocate)(struct dma_heap *heap,
			unsigned long len,
			unsigned long fd_flags,
			unsigned long heap_flags);
};

/**
 * struct dma_heap_export_info - information needed to export a new dmabuf heap
 * @name:	used for debugging/device-node name
 * @ops:	ops struct for this heap
 * @priv:	heap exporter private data
 *
 * Information needed to export a new dmabuf heap.
 */
struct dma_heap_export_info {
	const char *name;
	const struct dma_heap_ops *ops;
	void *priv;
};

/**
 * dma_heap_get_drvdata() - get per-heap driver data
 * @heap: DMA-Heap to retrieve private data for
 *
 * Returns:
 * The per-heap data for the heap.
 */
void *dma_heap_get_drvdata(struct dma_heap *heap);

/**
 * dma_heap_add - adds a heap to dmabuf heaps
 * @exp_info:		information needed to register this heap
 */
struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);

#endif /* _DMA_HEAPS_H */