xref: /openbmc/linux/include/uapi/linux/dma-heap.h (revision b3b43465)
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 _UAPI_LINUX_DMABUF_POOL_H
9 #define _UAPI_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 /* _UAPI_LINUX_DMABUF_POOL_H */
54