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 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 43 int ion_close(int fd) 44 { 45 int ret = close(fd); 46 if (ret < 0) 47 return -errno; 48 return ret; 49 } 50 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 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 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 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 } 121 122 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 } 142 143 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 } 155 156 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 } 172 173 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