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5
6#define _GNU_SOURCE
7#include <unistd.h>
8#include <sys/syscall.h>
9#include <string.h>
10#include <stdio.h>
11#include <sys/ioctl.h>
12
13#include "event.h"
14
15
16int perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu,
17 int group_fd, unsigned long flags)
18{
19 return syscall(__NR_perf_event_open, attr, pid, cpu,
20 group_fd, flags);
21}
22
23void event_init_opts(struct event *e, u64 config, int type, char *name)
24{
25 memset(e, 0, sizeof(*e));
26
27 e->name = name;
28
29 e->attr.type = type;
30 e->attr.config = config;
31 e->attr.size = sizeof(e->attr);
32
33 e->attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | \
34 PERF_FORMAT_TOTAL_TIME_RUNNING;
35}
36
37void event_init_named(struct event *e, u64 config, char *name)
38{
39 event_init_opts(e, config, PERF_TYPE_RAW, name);
40}
41
42void event_init(struct event *e, u64 config)
43{
44 event_init_opts(e, config, PERF_TYPE_RAW, "event");
45}
46
47#define PERF_CURRENT_PID 0
48#define PERF_NO_PID -1
49#define PERF_NO_CPU -1
50#define PERF_NO_GROUP -1
51
52int event_open_with_options(struct event *e, pid_t pid, int cpu, int group_fd)
53{
54 e->fd = perf_event_open(&e->attr, pid, cpu, group_fd, 0);
55 if (e->fd == -1) {
56 perror("perf_event_open");
57 return -1;
58 }
59
60 return 0;
61}
62
63int event_open_with_group(struct event *e, int group_fd)
64{
65 return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, group_fd);
66}
67
68int event_open_with_pid(struct event *e, pid_t pid)
69{
70 return event_open_with_options(e, pid, PERF_NO_CPU, PERF_NO_GROUP);
71}
72
73int event_open_with_cpu(struct event *e, int cpu)
74{
75 return event_open_with_options(e, PERF_NO_PID, cpu, PERF_NO_GROUP);
76}
77
78int event_open(struct event *e)
79{
80 return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, PERF_NO_GROUP);
81}
82
83void event_close(struct event *e)
84{
85 close(e->fd);
86}
87
88int event_enable(struct event *e)
89{
90 return ioctl(e->fd, PERF_EVENT_IOC_ENABLE);
91}
92
93int event_disable(struct event *e)
94{
95 return ioctl(e->fd, PERF_EVENT_IOC_DISABLE);
96}
97
98int event_reset(struct event *e)
99{
100 return ioctl(e->fd, PERF_EVENT_IOC_RESET);
101}
102
103int event_read(struct event *e)
104{
105 int rc;
106
107 rc = read(e->fd, &e->result, sizeof(e->result));
108 if (rc != sizeof(e->result)) {
109 fprintf(stderr, "read error on event %p!\n", e);
110 return -1;
111 }
112
113 return 0;
114}
115
116void event_report_justified(struct event *e, int name_width, int result_width)
117{
118 printf("%*s: result %*llu ", name_width, e->name, result_width,
119 e->result.value);
120
121 if (e->result.running == e->result.enabled)
122 printf("running/enabled %llu\n", e->result.running);
123 else
124 printf("running %llu enabled %llu\n", e->result.running,
125 e->result.enabled);
126}
127
128void event_report(struct event *e)
129{
130 event_report_justified(e, 0, 0);
131}
132
