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ion.c
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 <stdio.h>
25 #include <string.h>
26 #include <sys/ioctl.h>
27 #include <unistd.h>
28 #include <sys/mman.h>
29 #include <sys/types.h>
30 #include <ion/ion.h>
31 
32 #define ALOGE(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)
33 
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 
42 int ion_close(int fd)
43 {
44  int ret = close(fd);
45  if (ret < 0)
46  return -errno;
47  return ret;
48 }
49 
50 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 
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 
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 
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  struct ion_fd_data data = {
95  .handle = handle,
96  };
97 
98  if (map_fd == NULL)
99  return -EINVAL;
100  if (ptr == NULL)
101  return -EINVAL;
102 
103  ret = ion_ioctl(fd, ION_IOC_MAP, &data);
104  if (ret < 0)
105  return ret;
106  *map_fd = data.fd;
107  if (*map_fd < 0) {
108  ALOGE("map ioctl returned negative fd\n");
109  return -EINVAL;
110  }
111  *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
112  if (*ptr == MAP_FAILED) {
113  ALOGE("mmap failed: %s\n", strerror(errno));
114  return -errno;
115  }
116  return ret;
117 }
118 
119 int ion_share(int fd, ion_user_handle_t handle, int *share_fd)
120 {
121  int ret;
122  struct ion_fd_data data = {
123  .handle = handle,
124  };
125 
126  if (share_fd == NULL)
127  return -EINVAL;
128 
129  ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
130  if (ret < 0)
131  return ret;
132  *share_fd = data.fd;
133  if (*share_fd < 0) {
134  ALOGE("share ioctl returned negative fd\n");
135  return -EINVAL;
136  }
137  return ret;
138 }
139 
140 int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
141  unsigned int flags, int *handle_fd) {
142  ion_user_handle_t handle;
143  int ret;
144 
145  ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
146  if (ret < 0)
147  return ret;
148  ret = ion_share(fd, handle, handle_fd);
149  ion_free(fd, handle);
150  return ret;
151 }
152 
153 int ion_import(int fd, int share_fd, ion_user_handle_t *handle)
154 {
155  int ret;
156  struct ion_fd_data data = {
157  .fd = share_fd,
158  };
159 
160  if (handle == NULL)
161  return -EINVAL;
162 
163  ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
164  if (ret < 0)
165  return ret;
166  *handle = data.handle;
167  return ret;
168 }
169 
170 int ion_sync_fd(int fd, int handle_fd)
171 {
172  struct ion_fd_data data = {
173  .fd = handle_fd,
174  };
175  return ion_ioctl(fd, ION_IOC_SYNC, &data);
176 }