1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdio.h> 3 #include "api/fs/fs.h" 4 #include "util/pmu.h" 5 #include "util/topdown.h" 6 #include "util/evlist.h" 7 #include "util/debug.h" 8 #include "util/pmu-hybrid.h" 9 #include "topdown.h" 10 #include "evsel.h" 11 12 #define TOPDOWN_L1_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}" 13 #define TOPDOWN_L1_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/}" 14 #define TOPDOWN_L2_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}" 15 #define TOPDOWN_L2_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/,cpu_core/topdown-heavy-ops/,cpu_core/topdown-br-mispredict/,cpu_core/topdown-fetch-lat/,cpu_core/topdown-mem-bound/}" 16 17 /* Check whether there is a PMU which supports the perf metrics. */ 18 bool topdown_sys_has_perf_metrics(void) 19 { 20 static bool has_perf_metrics; 21 static bool cached; 22 struct perf_pmu *pmu; 23 24 if (cached) 25 return has_perf_metrics; 26 27 /* 28 * The perf metrics feature is a core PMU feature. 29 * The PERF_TYPE_RAW type is the type of a core PMU. 30 * The slots event is only available when the core PMU 31 * supports the perf metrics feature. 32 */ 33 pmu = perf_pmu__find_by_type(PERF_TYPE_RAW); 34 if (pmu && pmu_have_event(pmu->name, "slots")) 35 has_perf_metrics = true; 36 37 cached = true; 38 return has_perf_metrics; 39 } 40 41 /* 42 * Check whether we can use a group for top down. 43 * Without a group may get bad results due to multiplexing. 44 */ 45 bool arch_topdown_check_group(bool *warn) 46 { 47 int n; 48 49 if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0) 50 return false; 51 if (n > 0) { 52 *warn = true; 53 return false; 54 } 55 return true; 56 } 57 58 void arch_topdown_group_warn(void) 59 { 60 fprintf(stderr, 61 "nmi_watchdog enabled with topdown. May give wrong results.\n" 62 "Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n"); 63 } 64 65 #define TOPDOWN_SLOTS 0x0400 66 67 /* 68 * Check whether a topdown group supports sample-read. 69 * 70 * Only Topdown metric supports sample-read. The slots 71 * event must be the leader of the topdown group. 72 */ 73 74 bool arch_topdown_sample_read(struct evsel *leader) 75 { 76 if (!evsel__sys_has_perf_metrics(leader)) 77 return false; 78 79 if (leader->core.attr.config == TOPDOWN_SLOTS) 80 return true; 81 82 return false; 83 } 84 85 const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn) 86 { 87 const char *pmu_name; 88 89 if (!perf_pmu__has_hybrid()) 90 return "cpu"; 91 92 if (!evlist->hybrid_pmu_name) { 93 if (warn) 94 pr_warning("WARNING: default to use cpu_core topdown events\n"); 95 evlist->hybrid_pmu_name = perf_pmu__hybrid_type_to_pmu("core"); 96 } 97 98 pmu_name = evlist->hybrid_pmu_name; 99 100 return pmu_name; 101 } 102 103 int topdown_parse_events(struct evlist *evlist) 104 { 105 const char *topdown_events; 106 const char *pmu_name; 107 108 if (!topdown_sys_has_perf_metrics()) 109 return 0; 110 111 pmu_name = arch_get_topdown_pmu_name(evlist, false); 112 113 if (pmu_have_event(pmu_name, "topdown-heavy-ops")) { 114 if (!strcmp(pmu_name, "cpu_core")) 115 topdown_events = TOPDOWN_L2_EVENTS_CORE; 116 else 117 topdown_events = TOPDOWN_L2_EVENTS; 118 } else { 119 if (!strcmp(pmu_name, "cpu_core")) 120 topdown_events = TOPDOWN_L1_EVENTS_CORE; 121 else 122 topdown_events = TOPDOWN_L1_EVENTS; 123 } 124 125 return parse_event(evlist, topdown_events); 126 } 127