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/topdown.h" 6 #include "topdown.h" 7 #include "evsel.h" 8 9 /* Check whether there is a PMU which supports the perf metrics. */ 10 bool topdown_sys_has_perf_metrics(void) 11 { 12 static bool has_perf_metrics; 13 static bool cached; 14 struct perf_pmu *pmu; 15 16 if (cached) 17 return has_perf_metrics; 18 19 /* 20 * The perf metrics feature is a core PMU feature. 21 * The PERF_TYPE_RAW type is the type of a core PMU. 22 * The slots event is only available when the core PMU 23 * supports the perf metrics feature. 24 */ 25 pmu = perf_pmu__find_by_type(PERF_TYPE_RAW); 26 if (pmu && pmu_have_event(pmu->name, "slots")) 27 has_perf_metrics = true; 28 29 cached = true; 30 return has_perf_metrics; 31 } 32 33 #define TOPDOWN_SLOTS 0x0400 34 35 /* 36 * Check whether a topdown group supports sample-read. 37 * 38 * Only Topdown metric supports sample-read. The slots 39 * event must be the leader of the topdown group. 40 */ 41 bool arch_topdown_sample_read(struct evsel *leader) 42 { 43 if (!evsel__sys_has_perf_metrics(leader)) 44 return false; 45 46 if (leader->core.attr.config == TOPDOWN_SLOTS) 47 return true; 48 49 return false; 50 } 51