1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include "util/evsel.h" 5 #include "util/env.h" 6 #include "util/pmu.h" 7 #include "util/pmus.h" 8 #include "linux/string.h" 9 #include "evsel.h" 10 #include "util/debug.h" 11 #include "env.h" 12 13 #define IBS_FETCH_L3MISSONLY (1ULL << 59) 14 #define IBS_OP_L3MISSONLY (1ULL << 16) 15 16 void arch_evsel__set_sample_weight(struct evsel *evsel) 17 { 18 evsel__set_sample_bit(evsel, WEIGHT_STRUCT); 19 } 20 21 /* Check whether the evsel's PMU supports the perf metrics */ 22 bool evsel__sys_has_perf_metrics(const struct evsel *evsel) 23 { 24 struct perf_pmu *pmu; 25 u32 type = evsel->core.attr.type; 26 27 /* 28 * The PERF_TYPE_RAW type is the core PMU type, e.g., "cpu" PMU 29 * on a non-hybrid machine, "cpu_core" PMU on a hybrid machine. 30 * The slots event is only available for the core PMU, which 31 * supports the perf metrics feature. 32 * Checking both the PERF_TYPE_RAW type and the slots event 33 * should be good enough to detect the perf metrics feature. 34 */ 35 again: 36 switch (type) { 37 case PERF_TYPE_HARDWARE: 38 case PERF_TYPE_HW_CACHE: 39 type = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT; 40 if (type) 41 goto again; 42 break; 43 case PERF_TYPE_RAW: 44 break; 45 default: 46 return false; 47 } 48 49 pmu = evsel->pmu; 50 if (pmu && perf_pmu__is_fake(pmu)) 51 pmu = NULL; 52 53 if (!pmu) { 54 while ((pmu = perf_pmus__scan_core(pmu)) != NULL) { 55 if (pmu->type == PERF_TYPE_RAW) 56 break; 57 } 58 } 59 return pmu && perf_pmu__have_event(pmu, "slots"); 60 } 61 62 bool arch_evsel__must_be_in_group(const struct evsel *evsel) 63 { 64 if (!evsel__sys_has_perf_metrics(evsel) || !evsel->name || 65 strcasestr(evsel->name, "uops_retired.slots")) 66 return false; 67 68 return strcasestr(evsel->name, "topdown") || strcasestr(evsel->name, "slots"); 69 } 70 71 int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 72 { 73 u64 event = evsel->core.attr.config & PERF_HW_EVENT_MASK; 74 u64 pmu = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT; 75 const char *event_name; 76 77 if (event < PERF_COUNT_HW_MAX && evsel__hw_names[event]) 78 event_name = evsel__hw_names[event]; 79 else 80 event_name = "unknown-hardware"; 81 82 /* The PMU type is not required for the non-hybrid platform. */ 83 if (!pmu) 84 return scnprintf(bf, size, "%s", event_name); 85 86 return scnprintf(bf, size, "%s/%s/", 87 evsel->pmu ? evsel->pmu->name : "cpu", 88 event_name); 89 } 90 91 static void ibs_l3miss_warn(void) 92 { 93 pr_warning( 94 "WARNING: Hw internally resets sampling period when L3 Miss Filtering is enabled\n" 95 "and tagged operation does not cause L3 Miss. This causes sampling period skew.\n"); 96 } 97 98 void arch__post_evsel_config(struct evsel *evsel, struct perf_event_attr *attr) 99 { 100 struct perf_pmu *evsel_pmu, *ibs_fetch_pmu, *ibs_op_pmu; 101 static int warned_once; 102 103 if (warned_once || !x86__is_amd_cpu()) 104 return; 105 106 evsel_pmu = evsel__find_pmu(evsel); 107 if (!evsel_pmu) 108 return; 109 110 ibs_fetch_pmu = perf_pmus__find("ibs_fetch"); 111 ibs_op_pmu = perf_pmus__find("ibs_op"); 112 113 if (ibs_fetch_pmu && ibs_fetch_pmu->type == evsel_pmu->type) { 114 if (attr->config & IBS_FETCH_L3MISSONLY) { 115 ibs_l3miss_warn(); 116 warned_once = 1; 117 } 118 } else if (ibs_op_pmu && ibs_op_pmu->type == evsel_pmu->type) { 119 if (attr->config & IBS_OP_L3MISSONLY) { 120 ibs_l3miss_warn(); 121 warned_once = 1; 122 } 123 } 124 } 125 126 int arch_evsel__open_strerror(struct evsel *evsel, char *msg, size_t size) 127 { 128 if (!x86__is_amd_cpu()) 129 return 0; 130 131 if (!evsel->core.attr.precise_ip && 132 !(evsel->pmu && !strncmp(evsel->pmu->name, "ibs", 3))) 133 return 0; 134 135 /* More verbose IBS errors. */ 136 if (evsel->core.attr.exclude_kernel || evsel->core.attr.exclude_user || 137 evsel->core.attr.exclude_hv || evsel->core.attr.exclude_idle || 138 evsel->core.attr.exclude_host || evsel->core.attr.exclude_guest) { 139 return scnprintf(msg, size, "AMD IBS doesn't support privilege filtering. Try " 140 "again without the privilege modifiers (like 'k') at the end."); 141 } 142 143 return 0; 144 } 145