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 #include <internal/cpumap.h>
10
11 /* perf sample has 16 bits size limit */
12 #define PERF_SAMPLE_MAX_SIZE (1 << 16)
13
14 struct perf_mmap;
15 struct perf_counts_values;
16
17 typedef void (*libperf_unmap_cb_t)(struct perf_mmap *map);
18
19 /**
20 * struct perf_mmap - perf's ring buffer mmap details
21 *
22 * @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
23 */
24 struct perf_mmap {
25 void *base;
26 int mask;
27 int fd;
28 struct perf_cpu cpu;
29 refcount_t refcnt;
30 u64 prev;
31 u64 start;
32 u64 end;
33 bool overwrite;
34 u64 flush;
35 libperf_unmap_cb_t unmap_cb;
36 void *event_copy;
37 size_t event_copy_sz;
38 struct perf_mmap *next;
39 };
40
41 struct perf_mmap_param {
42 int prot;
43 int mask;
44 };
45
46 size_t perf_mmap__mmap_len(struct perf_mmap *map);
47
48 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
49 bool overwrite, libperf_unmap_cb_t unmap_cb);
50 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
51 int fd, struct perf_cpu cpu);
52 void perf_mmap__munmap(struct perf_mmap *map);
53 void perf_mmap__get(struct perf_mmap *map);
54 void perf_mmap__put(struct perf_mmap *map);
55
56 u64 perf_mmap__read_head(struct perf_mmap *map);
57
58 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count);
59
60 #endif /* __LIBPERF_INTERNAL_MMAP_H */
61
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