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