1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __TRACE_HELPER_H 3 #define __TRACE_HELPER_H 4 5 struct ksym { 6 long addr; 7 char *name; 8 }; 9 10 int load_kallsyms(void); 11 struct ksym *ksym_search(long key); 12 13 typedef int (*perf_event_print_fn)(void *data, int size); 14 15 /* return code for perf_event_print_fn */ 16 #define PERF_EVENT_DONE 0 17 #define PERF_EVENT_ERROR -1 18 #define PERF_EVENT_CONT -2 19 20 int perf_event_mmap(int fd); 21 /* return PERF_EVENT_DONE or PERF_EVENT_ERROR */ 22 int perf_event_poller(int fd, perf_event_print_fn output_fn); 23 #endif 24