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 <errno.h>
23 #include <fcntl.h>
24 #include <linux/ion.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 #include <unistd.h>
31
32 #include <ion/ion.h>
33 #include <log/log.h>
34
ion_open()35 int ion_open()
36 {
37 int fd = open("/dev/ion", O_RDONLY | O_CLOEXEC);
38 if (fd < 0)
39 ALOGE("open /dev/ion failed!\n");
40 return fd;
41 }
42
ion_close(int fd)43 int ion_close(int fd)
44 {
45 int ret = close(fd);
46 if (ret < 0)
47 return -errno;
48 return ret;
49 }
50
ion_ioctl(int fd,int req,void * arg)51 static int ion_ioctl(int fd, int req, void *arg)
52 {
53 int ret = ioctl(fd, req, arg);
54 if (ret < 0) {
55 ALOGE("ioctl %x failed with code %d: %s\n", req,
56 ret, strerror(errno));
57 return -errno;
58 }
59 return ret;
60 }
61
ion_alloc(int fd,size_t len,size_t align,unsigned int heap_mask,unsigned int flags,ion_user_handle_t * handle)62 int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask,
63 unsigned int flags, ion_user_handle_t *handle)
64 {
65 int ret;
66 struct ion_allocation_data data = {
67 .len = len,
68 .align = align,
69 .heap_id_mask = heap_mask,
70 .flags = flags,
71 };
72
73 if (handle == NULL)
74 return -EINVAL;
75
76 ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
77 if (ret < 0)
78 return ret;
79 *handle = data.handle;
80 return ret;
81 }
82
ion_free(int fd,ion_user_handle_t handle)83 int ion_free(int fd, ion_user_handle_t handle)
84 {
85 struct ion_handle_data data = {
86 .handle = handle,
87 };
88 return ion_ioctl(fd, ION_IOC_FREE, &data);
89 }
90
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)91 int ion_map(int fd, ion_user_handle_t handle, size_t length, int prot,
92 int flags, off_t offset, unsigned char **ptr, int *map_fd)
93 {
94 int ret;
95 unsigned char *tmp_ptr;
96 struct ion_fd_data data = {
97 .handle = handle,
98 };
99
100 if (map_fd == NULL)
101 return -EINVAL;
102 if (ptr == NULL)
103 return -EINVAL;
104
105 ret = ion_ioctl(fd, ION_IOC_MAP, &data);
106 if (ret < 0)
107 return ret;
108 if (data.fd < 0) {
109 ALOGE("map ioctl returned negative fd\n");
110 return -EINVAL;
111 }
112 tmp_ptr = mmap(NULL, length, prot, flags, data.fd, offset);
113 if (tmp_ptr == MAP_FAILED) {
114 ALOGE("mmap failed: %s\n", strerror(errno));
115 return -errno;
116 }
117 *map_fd = data.fd;
118 *ptr = tmp_ptr;
119 return ret;
120 }
121
ion_share(int fd,ion_user_handle_t handle,int * share_fd)122 int ion_share(int fd, ion_user_handle_t handle, int *share_fd)
123 {
124 int ret;
125 struct ion_fd_data data = {
126 .handle = handle,
127 };
128
129 if (share_fd == NULL)
130 return -EINVAL;
131
132 ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
133 if (ret < 0)
134 return ret;
135 if (data.fd < 0) {
136 ALOGE("share ioctl returned negative fd\n");
137 return -EINVAL;
138 }
139 *share_fd = data.fd;
140 return ret;
141 }
142
ion_alloc_fd(int fd,size_t len,size_t align,unsigned int heap_mask,unsigned int flags,int * handle_fd)143 int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
144 unsigned int flags, int *handle_fd) {
145 ion_user_handle_t handle;
146 int ret;
147
148 ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
149 if (ret < 0)
150 return ret;
151 ret = ion_share(fd, handle, handle_fd);
152 ion_free(fd, handle);
153 return ret;
154 }
155
ion_import(int fd,int share_fd,ion_user_handle_t * handle)156 int ion_import(int fd, int share_fd, ion_user_handle_t *handle)
157 {
158 int ret;
159 struct ion_fd_data data = {
160 .fd = share_fd,
161 };
162
163 if (handle == NULL)
164 return -EINVAL;
165
166 ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
167 if (ret < 0)
168 return ret;
169 *handle = data.handle;
170 return ret;
171 }
172
ion_sync_fd(int fd,int handle_fd)173 int ion_sync_fd(int fd, int handle_fd)
174 {
175 struct ion_fd_data data = {
176 .fd = handle_fd,
177 };
178 return ion_ioctl(fd, ION_IOC_SYNC, &data);
179 }
180