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 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 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 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 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 } 120 121 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 } 141 142 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 } 154 155 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 } 171 172 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
