1 /*
2  * drivers/staging/android/uapi/ion.h
3  *
4  * Copyright (C) 2011 Google, Inc.
5  *
6  * This software is licensed under the terms of the GNU General Public
7  * License version 2, as published by the Free Software Foundation, and
8  * may be copied, distributed, and modified under those terms.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  */
16 
17 #ifndef _UAPI_LINUX_ION_TEST_H
18 #define _UAPI_LINUX_ION_TEST_H
19 
20 #include <linux/ioctl.h>
21 #include <linux/types.h>
22 
23 /**
24  * struct ion_test_rw_data - metadata passed to the kernel to read handle
25  * @ptr:	a pointer to an area at least as large as size
26  * @offset:	offset into the ion buffer to start reading
27  * @size:	size to read or write
28  * @write:	1 to write, 0 to read
29  */
30 struct ion_test_rw_data {
31 	__u64 ptr;
32 	__u64 offset;
33 	__u64 size;
34 	int write;
35 	int __padding;
36 };
37 
38 #define ION_IOC_MAGIC		'I'
39 
40 /**
41  * DOC: ION_IOC_TEST_SET_DMA_BUF - attach a dma buf to the test driver
42  *
43  * Attaches a dma buf fd to the test driver.  Passing a second fd or -1 will
44  * release the first fd.
45  */
46 #define ION_IOC_TEST_SET_FD \
47 			_IO(ION_IOC_MAGIC, 0xf0)
48 
49 /**
50  * DOC: ION_IOC_TEST_DMA_MAPPING - read or write memory from a handle as DMA
51  *
52  * Reads or writes the memory from a handle using an uncached mapping.  Can be
53  * used by unit tests to emulate a DMA engine as close as possible.  Only
54  * expected to be used for debugging and testing, may not always be available.
55  */
56 #define ION_IOC_TEST_DMA_MAPPING \
57 			_IOW(ION_IOC_MAGIC, 0xf1, struct ion_test_rw_data)
58 
59 /**
60  * DOC: ION_IOC_TEST_KERNEL_MAPPING - read or write memory from a handle
61  *
62  * Reads or writes the memory from a handle using a kernel mapping.  Can be
63  * used by unit tests to test heap map_kernel functions.  Only expected to be
64  * used for debugging and testing, may not always be available.
65  */
66 #define ION_IOC_TEST_KERNEL_MAPPING \
67 			_IOW(ION_IOC_MAGIC, 0xf2, struct ion_test_rw_data)
68 
69 
70 #endif /* _UAPI_LINUX_ION_H */
71