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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LIBPERF_INTERNAL_MMAP_H
#define __LIBPERF_INTERNAL_MMAP_H
#include <linux/compiler.h>
#include <linux/refcount.h>
#include <linux/types.h>
#include <stdbool.h>
/* perf sample has 16 bits size limit */
#define PERF_SAMPLE_MAX_SIZE (1 << 16)
struct perf_mmap;
typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map);
/**
* struct perf_mmap - perf's ring buffer mmap details
*
* @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
*/
struct perf_mmap {
void *base;
int mask;
int fd;
int cpu;
refcount_t refcnt;
u64 prev;
u64 start;
u64 end;
bool overwrite;
u64 flush;
libperf_unmap_cb_t unmap_cb;
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
struct perf_mmap *next;
};
struct perf_mmap_param {
int prot;
int mask;
};
size_t perf_mmap__mmap_len(struct perf_mmap *map);
void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
bool overwrite, libperf_unmap_cb_t unmap_cb);
int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
int fd, int cpu);
void perf_mmap__munmap(struct perf_mmap *map);
void perf_mmap__get(struct perf_mmap *map);
void perf_mmap__put(struct perf_mmap *map);
u64 perf_mmap__read_head(struct perf_mmap *map);
#endif /* __LIBPERF_INTERNAL_MMAP_H */
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