// 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; }