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 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 41 int ion_close(int fd) 42 { 43 int ret = close(fd); 44 if (ret < 0) 45 return -errno; 46 return ret; 47 } 48 49 static int ion_ioctl(int fd, int req, void *arg) 50 { 51 int ret = ioctl(fd, req, arg); 52 if (ret < 0) { 53 ALOGE("ioctl %x failed with code %d: %s\n", req, 54 ret, strerror(errno)); 55 return -errno; 56 } 57 return ret; 58 } 59 60 int ion_alloc(int fd, size_t len, size_t align, unsigned int heap_mask, 61 unsigned int flags, ion_user_handle_t *handle) 62 { 63 int ret; 64 struct ion_allocation_data data = { 65 .len = len, 66 .align = align, 67 .heap_id_mask = heap_mask, 68 .flags = flags, 69 }; 70 71 if (handle == NULL) 72 return -EINVAL; 73 74 ret = ion_ioctl(fd, ION_IOC_ALLOC, &data); 75 if (ret < 0) 76 return ret; 77 *handle = data.handle; 78 return ret; 79 } 80 81 int ion_free(int fd, ion_user_handle_t handle) 82 { 83 struct ion_handle_data data = { 84 .handle = handle, 85 }; 86 return ion_ioctl(fd, ION_IOC_FREE, &data); 87 } 88 89 int ion_map(int fd, ion_user_handle_t handle, size_t length, int prot, 90 int flags, off_t offset, unsigned char **ptr, int *map_fd) 91 { 92 int ret; 93 struct ion_fd_data data = { 94 .handle = handle, 95 }; 96 97 if (map_fd == NULL) 98 return -EINVAL; 99 if (ptr == NULL) 100 return -EINVAL; 101 102 ret = ion_ioctl(fd, ION_IOC_MAP, &data); 103 if (ret < 0) 104 return ret; 105 *map_fd = data.fd; 106 if (*map_fd < 0) { 107 ALOGE("map ioctl returned negative fd\n"); 108 return -EINVAL; 109 } 110 *ptr = mmap(NULL, length, prot, flags, *map_fd, offset); 111 if (*ptr == MAP_FAILED) { 112 ALOGE("mmap failed: %s\n", strerror(errno)); 113 return -errno; 114 } 115 return ret; 116 } 117 118 int ion_share(int fd, ion_user_handle_t handle, int *share_fd) 119 { 120 int map_fd; 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 } 177
