91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include "api/fs/fs.h"
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#include "util/evsel.h"
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#include "util/evlist.h"
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#include "util/pmu.h"
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#include "util/pmus.h"
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#include "util/topdown.h"
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#include "topdown.h"
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#include "evsel.h"
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/* Check whether there is a PMU which supports the perf metrics. */
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bool topdown_sys_has_perf_metrics(void)
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{
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static bool has_perf_metrics;
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static bool cached;
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struct perf_pmu *pmu;
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if (cached)
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return has_perf_metrics;
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/*
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* The perf metrics feature is a core PMU feature.
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* The PERF_TYPE_RAW type is the type of a core PMU.
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* The slots event is only available when the core PMU
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* supports the perf metrics feature.
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*/
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pmu = perf_pmus__find_by_type(PERF_TYPE_RAW);
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if (pmu && perf_pmu__have_event(pmu, "slots"))
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has_perf_metrics = true;
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cached = true;
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return has_perf_metrics;
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}
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#define TOPDOWN_SLOTS 0x0400
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bool arch_is_topdown_slots(const struct evsel *evsel)
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{
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if (evsel->core.attr.config == TOPDOWN_SLOTS)
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return true;
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return false;
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}
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bool arch_is_topdown_metrics(const struct evsel *evsel)
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{
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int config = evsel->core.attr.config;
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const char *name_from_config;
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struct perf_pmu *pmu;
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/* All topdown events have an event code of 0. */
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if ((config & 0xFF) != 0)
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return false;
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pmu = evsel__find_pmu(evsel);
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if (!pmu || !pmu->is_core)
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return false;
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name_from_config = perf_pmu__name_from_config(pmu, config);
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return name_from_config && strcasestr(name_from_config, "topdown");
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}
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/*
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* Check whether a topdown group supports sample-read.
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*
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* Only Topdown metric supports sample-read. The slots
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* event must be the leader of the topdown group.
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*/
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bool arch_topdown_sample_read(struct evsel *leader)
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{
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struct evsel *evsel;
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if (!evsel__sys_has_perf_metrics(leader))
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return false;
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if (!arch_is_topdown_slots(leader))
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return false;
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/*
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* If slots event as leader event but no topdown metric events
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* in group, slots event should still sample as leader.
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*/
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evlist__for_each_entry(leader->evlist, evsel) {
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if (evsel->core.leader != leader->core.leader)
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return false;
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if (evsel != leader && arch_is_topdown_metrics(evsel))
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return true;
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}
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return false;
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}
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