1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
#ifndef __PERF_MMAP_H
#define __PERF_MMAP_H 1
#include <linux/compiler.h>
#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/ring_buffer.h>
#include <stdbool.h>
#ifdef HAVE_AIO_SUPPORT
#include <aio.h>
#endif
#include "auxtrace.h"
#include "event.h"
struct aiocb;
/**
* 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;
struct auxtrace_mmap auxtrace_mmap;
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
#ifdef HAVE_AIO_SUPPORT
struct {
void **data;
struct aiocb *cblocks;
struct aiocb **aiocb;
int nr_cblocks;
} aio;
#endif
};
/*
* State machine of bkw_mmap_state:
*
* .________________(forbid)_____________.
* | V
* NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
* ^ ^ | ^ |
* | |__(forbid)____/ |___(forbid)___/|
* | |
* \_________________(3)_______________/
*
* NOTREADY : Backward ring buffers are not ready
* RUNNING : Backward ring buffers are recording
* DATA_PENDING : We are required to collect data from backward ring buffers
* EMPTY : We have collected data from backward ring buffers.
*
* (0): Setup backward ring buffer
* (1): Pause ring buffers for reading
* (2): Read from ring buffers
* (3): Resume ring buffers for recording
*/
enum bkw_mmap_state {
BKW_MMAP_NOTREADY,
BKW_MMAP_RUNNING,
BKW_MMAP_DATA_PENDING,
BKW_MMAP_EMPTY,
};
struct mmap_params {
int prot, mask, nr_cblocks;
struct auxtrace_mmap_params auxtrace_mp;
};
int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *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);
void perf_mmap__consume(struct perf_mmap *map);
static inline u64 perf_mmap__read_head(struct perf_mmap *mm)
{
return ring_buffer_read_head(mm->base);
}
static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
{
ring_buffer_write_tail(md->base, tail);
}
union perf_event *perf_mmap__read_forward(struct perf_mmap *map);
union perf_event *perf_mmap__read_event(struct perf_mmap *map);
int perf_mmap__push(struct perf_mmap *md, void *to,
int push(struct perf_mmap *map, void *to, void *buf, size_t size));
#ifdef HAVE_AIO_SUPPORT
int perf_mmap__aio_push(struct perf_mmap *md, void *to, int idx,
int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off),
off_t *off);
#else
static inline int perf_mmap__aio_push(struct perf_mmap *md __maybe_unused, void *to __maybe_unused, int idx __maybe_unused,
int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off) __maybe_unused,
off_t *off __maybe_unused)
{
return 0;
}
#endif
size_t perf_mmap__mmap_len(struct perf_mmap *map);
int perf_mmap__read_init(struct perf_mmap *md);
void perf_mmap__read_done(struct perf_mmap *map);
#endif /*__PERF_MMAP_H */
|
