1#include <unistd.h>
2#include <stdlib.h>
3#include <signal.h>
4#include <sys/mman.h>
5
6#include "tests.h"
7#include "util/evsel.h"
8#include "util/evlist.h"
9#include "util/cpumap.h"
10#include "util/thread_map.h"
11
12#define NR_LOOPS  1000000
13
14/*
15 * This test will open software clock events (cpu-clock, task-clock)
16 * then check their frequency -> period conversion has no artifact of
17 * setting period to 1 forcefully.
18 */
19static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
20{
21	int i, err = -1;
22	volatile int tmp = 0;
23	u64 total_periods = 0;
24	int nr_samples = 0;
25	union perf_event *event;
26	struct perf_evsel *evsel;
27	struct perf_evlist *evlist;
28	struct perf_event_attr attr = {
29		.type = PERF_TYPE_SOFTWARE,
30		.config = clock_id,
31		.sample_type = PERF_SAMPLE_PERIOD,
32		.exclude_kernel = 1,
33		.disabled = 1,
34		.freq = 1,
35	};
36
37	attr.sample_freq = 10000;
38
39	evlist = perf_evlist__new();
40	if (evlist == NULL) {
41		pr_debug("perf_evlist__new\n");
42		return -1;
43	}
44
45	evsel = perf_evsel__new(&attr, 0);
46	if (evsel == NULL) {
47		pr_debug("perf_evsel__new\n");
48		goto out_free_evlist;
49	}
50	perf_evlist__add(evlist, evsel);
51
52	evlist->cpus = cpu_map__dummy_new();
53	evlist->threads = thread_map__new_by_tid(getpid());
54	if (!evlist->cpus || !evlist->threads) {
55		err = -ENOMEM;
56		pr_debug("Not enough memory to create thread/cpu maps\n");
57		goto out_delete_maps;
58	}
59
60	perf_evlist__open(evlist);
61
62	err = perf_evlist__mmap(evlist, 128, true);
63	if (err < 0) {
64		pr_debug("failed to mmap event: %d (%s)\n", errno,
65			 strerror(errno));
66		goto out_close_evlist;
67	}
68
69	perf_evlist__enable(evlist);
70
71	/* collect samples */
72	for (i = 0; i < NR_LOOPS; i++)
73		tmp++;
74
75	perf_evlist__disable(evlist);
76
77	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
78		struct perf_sample sample;
79
80		if (event->header.type != PERF_RECORD_SAMPLE)
81			goto next_event;
82
83		err = perf_evlist__parse_sample(evlist, event, &sample);
84		if (err < 0) {
85			pr_debug("Error during parse sample\n");
86			goto out_unmap_evlist;
87		}
88
89		total_periods += sample.period;
90		nr_samples++;
91next_event:
92		perf_evlist__mmap_consume(evlist, 0);
93	}
94
95	if ((u64) nr_samples == total_periods) {
96		pr_debug("All (%d) samples have period value of 1!\n",
97			 nr_samples);
98		err = -1;
99	}
100
101out_unmap_evlist:
102	perf_evlist__munmap(evlist);
103out_close_evlist:
104	perf_evlist__close(evlist);
105out_delete_maps:
106	perf_evlist__delete_maps(evlist);
107out_free_evlist:
108	perf_evlist__delete(evlist);
109	return err;
110}
111
112int test__sw_clock_freq(void)
113{
114	int ret;
115
116	ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
117	if (!ret)
118		ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
119
120	return ret;
121}
122