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. */
11 bool 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 */
42 bool 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
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