1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright 2013, Michael Ellerman, IBM Corp. |
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 <stdbool.h> |
12 | #include <sys/ioctl.h> |
13 | |
14 | #include "event.h" |
15 | |
16 | |
17 | int perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu, |
18 | int group_fd, unsigned long flags) |
19 | { |
20 | return syscall(__NR_perf_event_open, attr, pid, cpu, |
21 | group_fd, flags); |
22 | } |
23 | |
24 | static void __event_init_opts(struct event *e, u64 config, |
25 | int type, char *name, bool sampling) |
26 | { |
27 | memset(e, 0, sizeof(*e)); |
28 | |
29 | e->name = name; |
30 | |
31 | e->attr.type = type; |
32 | e->attr.config = config; |
33 | e->attr.size = sizeof(e->attr); |
34 | /* This has to match the structure layout in the header */ |
35 | e->attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | \ |
36 | PERF_FORMAT_TOTAL_TIME_RUNNING; |
37 | if (sampling) { |
38 | e->attr.sample_period = 1000; |
39 | e->attr.sample_type = PERF_SAMPLE_REGS_INTR; |
40 | e->attr.disabled = 1; |
41 | } |
42 | } |
43 | |
44 | void event_init_opts(struct event *e, u64 config, int type, char *name) |
45 | { |
46 | __event_init_opts(e, config, type, name, sampling: false); |
47 | } |
48 | |
49 | void event_init_named(struct event *e, u64 config, char *name) |
50 | { |
51 | event_init_opts(e, config, type: PERF_TYPE_RAW, name); |
52 | } |
53 | |
54 | void event_init(struct event *e, u64 config) |
55 | { |
56 | event_init_opts(e, config, type: PERF_TYPE_RAW, name: "event" ); |
57 | } |
58 | |
59 | void event_init_sampling(struct event *e, u64 config) |
60 | { |
61 | __event_init_opts(e, config, type: PERF_TYPE_RAW, name: "event" , sampling: true); |
62 | } |
63 | |
64 | #define PERF_CURRENT_PID 0 |
65 | #define PERF_NO_PID -1 |
66 | #define PERF_NO_CPU -1 |
67 | #define PERF_NO_GROUP -1 |
68 | |
69 | int event_open_with_options(struct event *e, pid_t pid, int cpu, int group_fd) |
70 | { |
71 | e->fd = perf_event_open(attr: &e->attr, pid, cpu, group_fd, flags: 0); |
72 | if (e->fd == -1) { |
73 | perror("perf_event_open" ); |
74 | return -1; |
75 | } |
76 | |
77 | return 0; |
78 | } |
79 | |
80 | int event_open_with_group(struct event *e, int group_fd) |
81 | { |
82 | return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, group_fd); |
83 | } |
84 | |
85 | int event_open_with_pid(struct event *e, pid_t pid) |
86 | { |
87 | return event_open_with_options(e, pid, PERF_NO_CPU, PERF_NO_GROUP); |
88 | } |
89 | |
90 | int event_open_with_cpu(struct event *e, int cpu) |
91 | { |
92 | return event_open_with_options(e, PERF_NO_PID, cpu, PERF_NO_GROUP); |
93 | } |
94 | |
95 | int event_open(struct event *e) |
96 | { |
97 | return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, PERF_NO_GROUP); |
98 | } |
99 | |
100 | void event_close(struct event *e) |
101 | { |
102 | close(e->fd); |
103 | } |
104 | |
105 | int event_enable(struct event *e) |
106 | { |
107 | return ioctl(e->fd, PERF_EVENT_IOC_ENABLE); |
108 | } |
109 | |
110 | int event_disable(struct event *e) |
111 | { |
112 | return ioctl(e->fd, PERF_EVENT_IOC_DISABLE); |
113 | } |
114 | |
115 | int event_reset(struct event *e) |
116 | { |
117 | return ioctl(e->fd, PERF_EVENT_IOC_RESET); |
118 | } |
119 | |
120 | int event_read(struct event *e) |
121 | { |
122 | int rc; |
123 | |
124 | rc = read(e->fd, &e->result, sizeof(e->result)); |
125 | if (rc != sizeof(e->result)) { |
126 | fprintf(stderr, "read error on event %p!\n" , e); |
127 | return -1; |
128 | } |
129 | |
130 | return 0; |
131 | } |
132 | |
133 | void event_report_justified(struct event *e, int name_width, int result_width) |
134 | { |
135 | printf("%*s: result %*llu " , name_width, e->name, result_width, |
136 | e->result.value); |
137 | |
138 | if (e->result.running == e->result.enabled) |
139 | printf("running/enabled %llu\n" , e->result.running); |
140 | else |
141 | printf("running %llu enabled %llu\n" , e->result.running, |
142 | e->result.enabled); |
143 | } |
144 | |
145 | void event_report(struct event *e) |
146 | { |
147 | event_report_justified(e, name_width: 0, result_width: 0); |
148 | } |
149 | |