1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LIBPERF_INTERNAL_MMAP_H 3 #define __LIBPERF_INTERNAL_MMAP_H 4 5 #include <linux/compiler.h> 6 #include <linux/refcount.h> 7 #include <linux/types.h> 8 #include <stdbool.h> 9 10 /* perf sample has 16 bits size limit */ 11 #define PERF_SAMPLE_MAX_SIZE (1 << 16) 12 13 /** 14 * struct perf_mmap - perf's ring buffer mmap details 15 * 16 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this 17 */ 18 struct perf_mmap { 19 void *base; 20 int mask; 21 int fd; 22 int cpu; 23 refcount_t refcnt; 24 u64 prev; 25 u64 start; 26 u64 end; 27 bool overwrite; 28 u64 flush; 29 char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); 30 }; 31 32 #endif /* __LIBPERF_INTERNAL_MMAP_H */ 33