1 /* 2 * Copyright (C) 2012 Samsung Electronics Co., Ltd. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <ion.h> 18 #include <fcntl.h> 19 #include <sys/mman.h> 20 #include <sys/ioctl.h> 21 #include <cutils/log.h> 22 23 typedef unsigned long ion_handle; 24 25 struct ion_allocation_data { 26 size_t len; 27 size_t align; 28 unsigned int heap_mask; 29 unsigned int flags; 30 ion_handle handle; 31 }; 32 33 struct ion_fd_data { 34 ion_handle handle; 35 int fd; 36 }; 37 38 struct ion_handle_data { 39 ion_handle handle; 40 }; 41 42 struct ion_custom_data { 43 unsigned int cmd; 44 unsigned long arg; 45 }; 46 47 #define ION_IOC_MAGIC 'I' 48 #define ION_IOC_ALLOC _IOWR(ION_IOC_MAGIC, 0, struct ion_allocation_data) 49 #define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data) 50 #define ION_IOC_MAP _IOWR(ION_IOC_MAGIC, 2, struct ion_fd_data) 51 #define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data) 52 #define ION_IOC_IMPORT _IOWR(ION_IOC_MAGIC, 5, struct ion_fd_data) 53 #define ION_IOC_CUSTOM _IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data) 54 #define ION_IOC_SYNC _IOWR(ION_IOC_MAGIC, 7, struct ion_fd_data) 55 56 struct ion_msync_data { 57 long flags; 58 ion_buffer buf; 59 size_t size; 60 off_t offset; 61 }; 62 63 enum ION_EXYNOS_CUSTOM_CMD { 64 ION_EXYNOS_CUSTOM_MSYNC 65 }; 66 67 ion_client ion_client_create(void) 68 { 69 return open("/dev/ion", O_RDWR); 70 } 71 72 void ion_client_destroy(ion_client client) 73 { 74 close(client); 75 } 76 77 ion_buffer ion_alloc(ion_client client, size_t len, size_t align, 78 unsigned int heap_mask, unsigned int flags) 79 { 80 int ret; 81 struct ion_handle_data arg_free; 82 struct ion_fd_data arg_share; 83 struct ion_allocation_data arg_alloc; 84 85 arg_alloc.len = len; 86 arg_alloc.align = align; 87 arg_alloc.heap_mask = heap_mask; 88 arg_alloc.flags = flags; 89 90 ret = ioctl(client, ION_IOC_ALLOC, &arg_alloc); 91 if (ret < 0) 92 return ret; 93 94 arg_share.handle = arg_alloc.handle; 95 ret = ioctl(client, ION_IOC_SHARE, &arg_share); 96 97 arg_free.handle = arg_alloc.handle; 98 ioctl(client, ION_IOC_FREE, &arg_free); 99 100 if (ret < 0) 101 return ret; 102 103 return arg_share.fd; 104 } 105 106 void ion_free(ion_buffer buffer) 107 { 108 close(buffer); 109 } 110 111 void *ion_map(ion_buffer buffer, size_t len, off_t offset) 112 { 113 return mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, 114 buffer, offset); 115 } 116 117 int ion_unmap(void *addr, size_t len) 118 { 119 return munmap(addr, len); 120 } 121 122 int ion_sync(ion_client client, ion_buffer buffer) 123 { 124 struct ion_fd_data data; 125 126 data.fd = buffer; 127 128 return ioctl(client, ION_IOC_SYNC, &data); 129 } 130 131 int ion_incRef(int fd, int share_fd, unsigned long **handle) 132 { 133 struct ion_fd_data data; 134 135 data.fd = share_fd; 136 137 int ret = ioctl(fd, ION_IOC_IMPORT, &data); 138 if (ret < 0) 139 return ret; 140 *handle = (unsigned long*)(data.handle); 141 return ret; 142 } 143 144 int ion_decRef(int fd, unsigned long *handle) 145 { 146 struct ion_handle_data data; 147 data.handle = (ion_handle)handle; 148 149 return ioctl(fd, ION_IOC_FREE, &data); 150 } 151
