1 // SPDX-License-Identifier: GPL-2.0 2 #include "api/fs/fs.h" 3 #include "util/evsel.h" 4 #include "util/evlist.h" 5 #include "util/pmu.h" 6 #include "util/pmus.h" 7 #include "util/topdown.h" 8 #include "topdown.h" 9 #include "evsel.h" 10 11 /* Check whether there is a PMU which supports the perf metrics. */ 12 bool topdown_sys_has_perf_metrics(void) 13 { 14 static bool has_perf_metrics; 15 static bool cached; 16 struct perf_pmu *pmu; 17 18 if (cached) 19 return has_perf_metrics; 20 21 /* 22 * The perf metrics feature is a core PMU feature. 23 * The PERF_TYPE_RAW type is the type of a core PMU. 24 * The slots event is only available when the core PMU 25 * supports the perf metrics feature. 26 */ 27 pmu = perf_pmus__find_by_type(PERF_TYPE_RAW); 28 if (pmu && perf_pmu__have_event(pmu, "slots")) 29 has_perf_metrics = true; 30 31 cached = true; 32 return has_perf_metrics; 33 } 34 35 #define TOPDOWN_SLOTS 0x0400 36 bool arch_is_topdown_slots(const struct evsel *evsel) 37 { 38 if (evsel->core.attr.config == TOPDOWN_SLOTS) 39 return true; 40 41 return false; 42 } 43 44 bool arch_is_topdown_metrics(const struct evsel *evsel) 45 { 46 int config = evsel->core.attr.config; 47 const char *name_from_config; 48 struct perf_pmu *pmu; 49 50 /* All topdown events have an event code of 0. */ 51 if ((config & 0xFF) != 0) 52 return false; 53 54 pmu = evsel__find_pmu(evsel); 55 if (!pmu || !pmu->is_core) 56 return false; 57 58 name_from_config = perf_pmu__name_from_config(pmu, config); 59 return name_from_config && strcasestr(name_from_config, "topdown"); 60 } 61 62 /* 63 * Check whether a topdown group supports sample-read. 64 * 65 * Only Topdown metric supports sample-read. The slots 66 * event must be the leader of the topdown group. 67 */ 68 bool arch_topdown_sample_read(struct evsel *leader) 69 { 70 struct evsel *evsel; 71 72 if (!evsel__sys_has_perf_metrics(leader)) 73 return false; 74 75 if (!arch_is_topdown_slots(leader)) 76 return false; 77 78 /* 79 * If slots event as leader event but no topdown metric events 80 * in group, slots event should still sample as leader. 81 */ 82 evlist__for_each_entry(leader->evlist, evsel) { 83 if (evsel->core.leader != leader->core.leader) 84 return false; 85 if (evsel != leader && arch_is_topdown_metrics(evsel)) 86 return true; 87 } 88 89 return false; 90 } 91