1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * DMABUF Heaps Allocation Infrastructure
4 *
5 * Copyright (C) 2011 Google, Inc.
6 * Copyright (C) 2019 Linaro Ltd.
7 */
8
9#ifndef _DMA_HEAPS_H
10#define _DMA_HEAPS_H
11
12#include <linux/cdev.h>
13#include <linux/types.h>
14
15struct dma_heap;
16
17/**
18 * struct dma_heap_ops - ops to operate on a given heap
19 * @allocate:		allocate dmabuf and return struct dma_buf ptr
20 *
21 * allocate returns dmabuf on success, ERR_PTR(-errno) on error.
22 */
23struct dma_heap_ops {
24	struct dma_buf *(*allocate)(struct dma_heap *heap,
25				    unsigned long len,
26				    unsigned long fd_flags,
27				    unsigned long heap_flags);
28};
29
30/**
31 * struct dma_heap_export_info - information needed to export a new dmabuf heap
32 * @name:	used for debugging/device-node name
33 * @ops:	ops struct for this heap
34 * @priv:	heap exporter private data
35 *
36 * Information needed to export a new dmabuf heap.
37 */
38struct dma_heap_export_info {
39	const char *name;
40	const struct dma_heap_ops *ops;
41	void *priv;
42};
43
44/**
45 * dma_heap_get_drvdata() - get per-heap driver data
46 * @heap: DMA-Heap to retrieve private data for
47 *
48 * Returns:
49 * The per-heap data for the heap.
50 */
51void *dma_heap_get_drvdata(struct dma_heap *heap);
52
53/**
54 * dma_heap_get_name() - get heap name
55 * @heap: DMA-Heap to retrieve private data for
56 *
57 * Returns:
58 * The char* for the heap name.
59 */
60const char *dma_heap_get_name(struct dma_heap *heap);
61
62/**
63 * dma_heap_add - adds a heap to dmabuf heaps
64 * @exp_info:		information needed to register this heap
65 */
66struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
67
68#endif /* _DMA_HEAPS_H */
69