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