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 13struct perf_mmap; 14struct perf_counts_values; 15 16typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map); 17 18/** 19 * struct perf_mmap - perf's ring buffer mmap details 20 * 21 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this 22 */ 23struct perf_mmap { 24 void *base; 25 int mask; 26 int fd; 27 int cpu; 28 refcount_t refcnt; 29 u64 prev; 30 u64 start; 31 u64 end; 32 bool overwrite; 33 u64 flush; 34 libperf_unmap_cb_t unmap_cb; 35 char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); 36 struct perf_mmap *next; 37}; 38 39struct perf_mmap_param { 40 int prot; 41 int mask; 42}; 43 44size_t perf_mmap__mmap_len(struct perf_mmap *map); 45 46void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev, 47 bool overwrite, libperf_unmap_cb_t unmap_cb); 48int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp, 49 int fd, int cpu); 50void perf_mmap__munmap(struct perf_mmap *map); 51void perf_mmap__get(struct perf_mmap *map); 52void perf_mmap__put(struct perf_mmap *map); 53 54u64 perf_mmap__read_head(struct perf_mmap *map); 55 56int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count); 57 58#endif /* __LIBPERF_INTERNAL_MMAP_H */ 59