1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LIBPERF_INTERNAL_MMAP_H
3 #define __LIBPERF_INTERNAL_MMAP_H
5 #include <linux/compiler.h>
6 #include <linux/refcount.h>
7 #include <linux/types.h>
9 #include <internal/cpumap.h>
11 /* perf sample has 16 bits size limit */
12 #define PERF_SAMPLE_MAX_SIZE (1 << 16)
15 struct perf_counts_values;
17 typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map);
20 * struct perf_mmap - perf's ring buffer mmap details
22 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
35 libperf_unmap_cb_t unmap_cb;
36 char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
37 struct perf_mmap *next;
40 struct perf_mmap_param {
45 size_t perf_mmap__mmap_len(struct perf_mmap *map);
47 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
48 bool overwrite, libperf_unmap_cb_t unmap_cb);
49 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
50 int fd, struct perf_cpu cpu);
51 void perf_mmap__munmap(struct perf_mmap *map);
52 void perf_mmap__get(struct perf_mmap *map);
53 void perf_mmap__put(struct perf_mmap *map);
55 u64 perf_mmap__read_head(struct perf_mmap *map);
57 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count);
59 #endif /* __LIBPERF_INTERNAL_MMAP_H */