1// SPDX-License-Identifier: GPL-2.0
2#include "api/fs/fs.h"
3#include "util/evsel.h"
4#include "util/pmu.h"
5#include "util/pmus.h"
6#include "util/topdown.h"
7#include "topdown.h"
8#include "evsel.h"
9
10/* Check whether there is a PMU which supports the perf metrics. */
11bool topdown_sys_has_perf_metrics(void)
12{
13	static bool has_perf_metrics;
14	static bool cached;
15	struct perf_pmu *pmu;
16
17	if (cached)
18		return has_perf_metrics;
19
20	/*
21	 * The perf metrics feature is a core PMU feature.
22	 * The PERF_TYPE_RAW type is the type of a core PMU.
23	 * The slots event is only available when the core PMU
24	 * supports the perf metrics feature.
25	 */
26	pmu = perf_pmus__find_by_type(PERF_TYPE_RAW);
27	if (pmu && perf_pmu__have_event(pmu, "slots"))
28		has_perf_metrics = true;
29
30	cached = true;
31	return has_perf_metrics;
32}
33
34#define TOPDOWN_SLOTS		0x0400
35
36/*
37 * Check whether a topdown group supports sample-read.
38 *
39 * Only Topdown metric supports sample-read. The slots
40 * event must be the leader of the topdown group.
41 */
42bool arch_topdown_sample_read(struct evsel *leader)
43{
44	if (!evsel__sys_has_perf_metrics(leader))
45		return false;
46
47	if (leader->core.attr.config == TOPDOWN_SLOTS)
48		return true;
49
50	return false;
51}
52