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 56
