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. */ topdown_sys_has_perf_metrics(void)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 */ arch_topdown_sample_read(struct evsel * leader)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