tools/perf/arch/x86/util/tsc.c


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

#include <stdbool.h>
#include <errno.h>

#include <linux/perf_event.h>

#include "../../perf.h"
#include <linux/types.h>
#include "../../util/debug.h"
#include "../../util/tsc.h"
#include "tsc.h"

int perf_read_tsc_conversion(const struct perf_event_mmap_page *pc,
			     struct perf_tsc_conversion *tc)
{
	bool cap_user_time_zero;
	u32 seq;
	int i = 0;

	while (1) {
		seq = pc->lock;
		rmb();
		tc->time_mult = pc->time_mult;
		tc->time_shift = pc->time_shift;
		tc->time_zero = pc->time_zero;
		cap_user_time_zero = pc->cap_user_time_zero;
		rmb();
		if (pc->lock == seq && !(seq & 1))
			break;
		if (++i > 10000) {
			pr_debug("failed to get perf_event_mmap_page lock\n");
			return -EINVAL;
		}
	}

	if (!cap_user_time_zero)
		return -EOPNOTSUPP;

	return 0;
}