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authorRebecca Schultz Zavin2012-02-22 18:36:55 -0600
committerRebecca Schultz Zavin2012-02-23 14:18:31 -0600
commitafd912394690cbf7d40b021c62d80ff0f3d40806 (patch)
tree6a180d768c4154dcc20f296b4317a43eb9b1dd20 /libion/ion.c
parentc8ba5366da7e23ebf1cd76bcf49449b878563102 (diff)
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Add ion helper library
This library contains helper functions for using ion Change-Id: I7d7f76d6d3f36cd94d67797a38099a94214392b1 Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Diffstat (limited to 'libion/ion.c')
-rw-r--r--libion/ion.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/libion/ion.c b/libion/ion.c
new file mode 100644
index 000000000..dbeac2387
--- /dev/null
+++ b/libion/ion.c
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1/*
2 * ion.c
3 *
4 * Memory Allocator functions for ion
5 *
6 * Copyright 2011 Google, Inc
7 *
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20#define LOG_TAG "ion"
21
22#include <cutils/log.h>
23#include <errno.h>
24#include <fcntl.h>
25#include <stdio.h>
26#include <sys/ioctl.h>
27#include <sys/mman.h>
28#include <sys/types.h>
29
30#include <linux/ion.h>
31#include <ion/ion.h>
32
33int ion_open()
34{
35 int fd = open("/dev/ion", O_RDWR);
36 if (fd < 0)
37 ALOGE("open /dev/ion failed!\n");
38 return fd;
39}
40
41int ion_close(int fd)
42{
43 return close(fd);
44}
45
46static int ion_ioctl(int fd, int req, void *arg)
47{
48 int ret = ioctl(fd, req, arg);
49 if (ret < 0) {
50 ALOGE("ioctl %x failed with code %d: %s\n", req,
51 ret, strerror(errno));
52 return -errno;
53 }
54 return ret;
55}
56
57int ion_alloc(int fd, size_t len, size_t align, unsigned int flags,
58 struct ion_handle **handle)
59{
60 int ret;
61 struct ion_allocation_data data = {
62 .len = len,
63 .align = align,
64 .flags = flags,
65 };
66
67 ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
68 if (ret < 0)
69 return ret;
70 *handle = data.handle;
71 return ret;
72}
73
74int ion_free(int fd, struct ion_handle *handle)
75{
76 struct ion_handle_data data = {
77 .handle = handle,
78 };
79 return ion_ioctl(fd, ION_IOC_FREE, &data);
80}
81
82int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
83 int flags, off_t offset, unsigned char **ptr, int *map_fd)
84{
85 struct ion_fd_data data = {
86 .handle = handle,
87 };
88
89 int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
90 if (ret < 0)
91 return ret;
92 *map_fd = data.fd;
93 if (*map_fd < 0) {
94 ALOGE("map ioctl returned negative fd\n");
95 return -EINVAL;
96 }
97 *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
98 if (*ptr == MAP_FAILED) {
99 ALOGE("mmap failed: %s\n", strerror(errno));
100 return -errno;
101 }
102 return ret;
103}
104
105int ion_share(int fd, struct ion_handle *handle, int *share_fd)
106{
107 int map_fd;
108 struct ion_fd_data data = {
109 .handle = handle,
110 };
111
112 int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
113 if (ret < 0)
114 return ret;
115 *share_fd = data.fd;
116 if (*share_fd < 0) {
117 ALOGE("share ioctl returned negative fd\n");
118 return -EINVAL;
119 }
120 return ret;
121}
122
123int ion_import(int fd, int share_fd, struct ion_handle **handle)
124{
125 struct ion_fd_data data = {
126 .fd = share_fd,
127 };
128
129 int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
130 if (ret < 0)
131 return ret;
132 *handle = data.handle;
133 return ret;
134}