linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3 * DMABUF Heaps Userspace API
4 *
5 * Copyright (C) 2011 Google, Inc.
6 * Copyright (C) 2019 Linaro Ltd.
7 */
8 #ifndef _LINUX_DMABUF_POOL_H
9 #define _LINUX_DMABUF_POOL_H
10
11 #include <linux/ioctl.h>
12 #include <linux/types.h>
13
14 /**
15 * DOC: DMABUF Heaps Userspace API
16 */
17
18 /* Valid FD_FLAGS are O_CLOEXEC, O_RDONLY, O_WRONLY, O_RDWR */
19 #define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)
20
21 /* Currently no heap flags */
22 #define DMA_HEAP_VALID_HEAP_FLAGS (0)
23
24 /**
25 * struct dma_heap_allocation_data - metadata passed from userspace for
26 * allocations
27 * @len: size of the allocation
28 * @fd: will be populated with a fd which provides the
29 * handle to the allocated dma-buf
30 * @fd_flags: file descriptor flags used when allocating
31 * @heap_flags: flags passed to heap
32 *
33 * Provided by userspace as an argument to the ioctl
34 */
35 struct dma_heap_allocation_data {
36 __u64 len;
37 __u32 fd;
38 __u32 fd_flags;
39 __u64 heap_flags;
40 };
41
42 #define DMA_HEAP_IOC_MAGIC 'H'
43
44 /**
45 * DOC: DMA_HEAP_IOCTL_ALLOC - allocate memory from pool
46 *
47 * Takes a dma_heap_allocation_data struct and returns it with the fd field
48 * populated with the dmabuf handle of the allocation.
49 */
50 #define DMA_HEAP_IOCTL_ALLOC _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,\
51 struct dma_heap_allocation_data)
52
53 #endif /* _LINUX_DMABUF_POOL_H */
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