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
ion_open()33 int 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
ion_close(int fd)41 int ion_close(int fd)
42 {
43 return close(fd);
44 }
45
ion_ioctl(int fd,int req,void * arg)46 static 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
ion_alloc(int fd,size_t len,size_t align,unsigned int heap_mask,unsigned int flags,struct ion_handle ** handle)57 int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask,
58 unsigned int flags, struct ion_handle **handle)
59 {
60 int ret;
61 struct ion_allocation_data data = {
62 .len = len,
63 .align = align,
64 .heap_mask = heap_mask,
65 .flags = flags,
66 };
67
68 ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
69 if (ret < 0)
70 return ret;
71 *handle = data.handle;
72 return ret;
73 }
74
ion_free(int fd,struct ion_handle * handle)75 int ion_free(int fd, struct ion_handle *handle)
76 {
77 struct ion_handle_data data = {
78 .handle = handle,
79 };
80 return ion_ioctl(fd, ION_IOC_FREE, &data);
81 }
82
ion_map(int fd,struct ion_handle * handle,size_t length,int prot,int flags,off_t offset,unsigned char ** ptr,int * map_fd)83 int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
84 int flags, off_t offset, unsigned char **ptr, int *map_fd)
85 {
86 struct ion_fd_data data = {
87 .handle = handle,
88 };
89
90 int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
91 if (ret < 0)
92 return ret;
93 *map_fd = data.fd;
94 if (*map_fd < 0) {
95 ALOGE("map ioctl returned negative fd\n");
96 return -EINVAL;
97 }
98 *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
99 if (*ptr == MAP_FAILED) {
100 ALOGE("mmap failed: %s\n", strerror(errno));
101 return -errno;
102 }
103 return ret;
104 }
105
ion_share(int fd,struct ion_handle * handle,int * share_fd)106 int ion_share(int fd, struct ion_handle *handle, int *share_fd)
107 {
108 int map_fd;
109 struct ion_fd_data data = {
110 .handle = handle,
111 };
112
113 int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
114 if (ret < 0)
115 return ret;
116 *share_fd = data.fd;
117 if (*share_fd < 0) {
118 ALOGE("share ioctl returned negative fd\n");
119 return -EINVAL;
120 }
121 return ret;
122 }
123
ion_alloc_fd(int fd,size_t len,size_t align,unsigned int heap_mask,unsigned int flags,int * handle_fd)124 int ion_alloc_fd(int fd, size_t len, size_t align, unsigned int heap_mask,
125 unsigned int flags, int *handle_fd) {
126 struct ion_handle *handle;
127 int ret;
128
129 ret = ion_alloc(fd, len, align, heap_mask, flags, &handle);
130 if (ret < 0)
131 return ret;
132 ret = ion_share(fd, handle, handle_fd);
133 ion_free(fd, handle);
134 return ret;
135 }
136
ion_import(int fd,int share_fd,struct ion_handle ** handle)137 int ion_import(int fd, int share_fd, struct ion_handle **handle)
138 {
139 struct ion_fd_data data = {
140 .fd = share_fd,
141 };
142
143 int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
144 if (ret < 0)
145 return ret;
146 *handle = data.handle;
147 return ret;
148 }
149
ion_sync_fd(int fd,int handle_fd)150 int ion_sync_fd(int fd, int handle_fd)
151 {
152 struct ion_fd_data data = {
153 .fd = handle_fd,
154 };
155 return ion_ioctl(fd, ION_IOC_SYNC, &data);
156 }
157