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 <string.h>
27 #include <sys/ioctl.h>
28 #include <sys/mman.h>
29 #include <sys/types.h>
30
31 #include <linux/ion.h>
32 #include <ion/ion.h>
33
ion_open()34 int ion_open()
35 {
36 int fd = open("/dev/ion", O_RDWR);
37 if (fd < 0)
38 ALOGE("open /dev/ion failed!\n");
39 return fd;
40 }
41
ion_close(int fd)42 int ion_close(int fd)
43 {
44 int ret = close(fd);
45 if (ret < 0)
46 return -errno;
47 return ret;
48 }
49
ion_ioctl(int fd,int req,void * arg)50 static int ion_ioctl(int fd, int req, void *arg)
51 {
52 int ret = ioctl(fd, req, arg);
53 if (ret < 0) {
54 ALOGE("ioctl %x failed with code %d: %s\n", req,
55 ret, strerror(errno));
56 return -errno;
57 }
58 return ret;
59 }
60
ion_alloc(int fd,size_t len,size_t align,unsigned int heap_mask,unsigned int flags,ion_user_handle_t * handle)61 int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask,
62 unsigned int flags, ion_user_handle_t *handle)
63 {
64 int ret;
65 struct ion_allocation_data data = {
66 .len = len,
67 .align = align,
68 .heap_id_mask = heap_mask,
69 .flags = flags,
70 };
71
72 if (handle == NULL)
73 return -EINVAL;
74
75 ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
76 if (ret < 0)
77 return ret;
78 *handle = data.handle;
79 return ret;
80 }
81
ion_free(int fd,ion_user_handle_t handle)82 int ion_free(int fd, ion_user_handle_t handle)
83 {
84 struct ion_handle_data data = {
85 .handle = handle,
86 };
87 return ion_ioctl(fd, ION_IOC_FREE, &data);
88 }
89
ion_map(int fd,ion_user_handle_t handle,size_t length,int prot,int flags,off_t offset,unsigned char ** ptr,int * map_fd)90 int ion_map(int fd, ion_user_handle_t handle, size_t length, int prot,
91 int flags, off_t offset, unsigned char **ptr, int *map_fd)
92 {
93 int ret;
94 unsigned char *tmp_ptr;
95 struct ion_fd_data data = {
96 .handle = handle,
97 };
98
99 if (map_fd == NULL)
100 return -EINVAL;
101 if (ptr == NULL)
102 return -EINVAL;
103
104 ret = ion_ioctl(fd, ION_IOC_MAP, &data);
105 if (ret < 0)
106 return ret;
107 if (data.fd < 0) {
108 ALOGE("map ioctl returned negative fd\n");
109 return -EINVAL;
110 }
111 tmp_ptr = mmap(NULL, length, prot, flags, data.fd, offset);
112 if (tmp_ptr == MAP_FAILED) {
113 ALOGE("mmap failed: %s\n", strerror(errno));
114 return -errno;
115 }
116 *map_fd = data.fd;
117 *ptr = tmp_ptr;
118 return ret;
119 }
120
ion_share(int fd,ion_user_handle_t handle,int * share_fd)121 int ion_share(int fd, ion_user_handle_t handle, int *share_fd)
122 {
123 int ret;
124 struct ion_fd_data data = {
125 .handle = handle,
126 };
127
128 if (share_fd == NULL)
129 return -EINVAL;
130
131 ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
132 if (ret < 0)
133 return ret;
134 if (data.fd < 0) {
135 ALOGE("share ioctl returned negative fd\n");
136 return -EINVAL;
137 }
138 *share_fd = data.fd;
139 return ret;
140 }
141
ion_alloc_fd(int fd,size_t len,size_t align,unsigned int heap_mask,unsigned int flags,int * handle_fd)142 int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
143 unsigned int flags, int *handle_fd) {
144 ion_user_handle_t handle;
145 int ret;
146
147 ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
148 if (ret < 0)
149 return ret;
150 ret = ion_share(fd, handle, handle_fd);
151 ion_free(fd, handle);
152 return ret;
153 }
154
ion_import(int fd,int share_fd,ion_user_handle_t * handle)155 int ion_import(int fd, int share_fd, ion_user_handle_t *handle)
156 {
157 int ret;
158 struct ion_fd_data data = {
159 .fd = share_fd,
160 };
161
162 if (handle == NULL)
163 return -EINVAL;
164
165 ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
166 if (ret < 0)
167 return ret;
168 *handle = data.handle;
169 return ret;
170 }
171
ion_sync_fd(int fd,int handle_fd)172 int ion_sync_fd(int fd, int handle_fd)
173 {
174 struct ion_fd_data data = {
175 .fd = handle_fd,
176 };
177 return ion_ioctl(fd, ION_IOC_SYNC, &data);
178 }
179