libion_exynos/libion.cpp

   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 }