1 /*
2 * Copyright 2013, Michael Ellerman, IBM Corp.
3 * Licensed under GPLv2.
4 */
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
perf_event_open(struct perf_event_attr * attr,pid_t pid,int cpu,int group_fd,unsigned long flags)16 int 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
event_init_opts(struct event * e,u64 config,int type,char * name)23 void 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 /* This has to match the structure layout in the header */
33 e->attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | \
34 PERF_FORMAT_TOTAL_TIME_RUNNING;
35 }
36
event_init_named(struct event * e,u64 config,char * name)37 void event_init_named(struct event *e, u64 config, char *name)
38 {
39 event_init_opts(e, config, PERF_TYPE_RAW, name);
40 }
41
event_init(struct event * e,u64 config)42 void 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
event_open_with_options(struct event * e,pid_t pid,int cpu,int group_fd)52 int 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
event_open_with_group(struct event * e,int group_fd)63 int 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
event_open_with_pid(struct event * e,pid_t pid)68 int 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
event_open_with_cpu(struct event * e,int cpu)73 int 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
event_open(struct event * e)78 int event_open(struct event *e)
79 {
80 return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, PERF_NO_GROUP);
81 }
82
event_close(struct event * e)83 void event_close(struct event *e)
84 {
85 close(e->fd);
86 }
87
event_enable(struct event * e)88 int event_enable(struct event *e)
89 {
90 return ioctl(e->fd, PERF_EVENT_IOC_ENABLE);
91 }
92
event_disable(struct event * e)93 int event_disable(struct event *e)
94 {
95 return ioctl(e->fd, PERF_EVENT_IOC_DISABLE);
96 }
97
event_reset(struct event * e)98 int event_reset(struct event *e)
99 {
100 return ioctl(e->fd, PERF_EVENT_IOC_RESET);
101 }
102
event_read(struct event * e)103 int 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
event_report_justified(struct event * e,int name_width,int result_width)116 void 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
event_report(struct event * e)128 void event_report(struct event *e)
129 {
130 event_report_justified(e, 0, 0);
131 }
132