root/tools/testing/selftests/android/ion/ionutils.h

INCLUDED FROM

   1 #ifndef __ION_UTILS_H
   2 #define __ION_UTILS_H
   3 
   4 #include "ion.h"
   5 
   6 #define SOCKET_NAME "ion_socket"
   7 #define ION_DEVICE "/dev/ion"
   8 
   9 #define ION_BUFFER_LEN  4096
  10 #define MAX_HEAP_COUNT  ION_HEAP_TYPE_CUSTOM
  11 
  12 struct socket_info {
  13         int sockfd;
  14         int datafd;
  15         unsigned long buflen;
  16 };
  17 
  18 struct ion_buffer_info {
  19         int ionfd;
  20         int buffd;
  21         unsigned int heap_type;
  22         unsigned int flag_type;
  23         unsigned long heap_size;
  24         unsigned long buflen;
  25         unsigned char *buffer;
  26 };
  27 
  28 
  29 /* This is used to fill the data into the mapped buffer */
  30 void write_buffer(void *buffer, unsigned long len);
  31 
  32 /* This is used to read the data from the exported buffer */
  33 void read_buffer(void *buffer, unsigned long len);
  34 
  35 /* This is used to create an ION buffer FD for the kernel buffer
  36  * So you can export this same buffer to others in the form of FD
  37  */
  38 int ion_export_buffer_fd(struct ion_buffer_info *ion_info);
  39 
  40 /* This is used to import or map an exported FD.
  41  * So we point to same buffer without making a copy. Hence zero-copy.
  42  */
  43 int ion_import_buffer_fd(struct ion_buffer_info *ion_info);
  44 
  45 /* This is used to close all references for the ION client */
  46 void ion_close_buffer_fd(struct ion_buffer_info *ion_info);
  47 
  48 /* This is used to send FD to another process using socket IPC */
  49 int socket_send_fd(struct socket_info *skinfo);
  50 
  51 /* This is used to receive FD from another process using socket IPC */
  52 int socket_receive_fd(struct socket_info *skinfo);
  53 
  54 
  55 #endif