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 "topdown.h" 10 #include "evsel.h" 11 #include "util/debug.h" 12 #include "env.h" 13 14 #define IBS_FETCH_L3MISSONLY (1ULL << 59) 15 #define IBS_OP_L3MISSONLY (1ULL << 16) 16 17 void arch_evsel__set_sample_weight(struct evsel *evsel) 18 { 19 evsel__set_sample_bit(evsel, WEIGHT_STRUCT); 20 } 21 22 /* Check whether the evsel's PMU supports the perf metrics */ 23 bool evsel__sys_has_perf_metrics(const struct evsel *evsel) 24 { 25 struct perf_pmu *pmu; 26 u32 type = evsel->core.attr.type; 27 28 /* 29 * The PERF_TYPE_RAW type is the core PMU type, e.g., "cpu" PMU 30 * on a non-hybrid machine, "cpu_core" PMU on a hybrid machine. 31 * The slots event is only available for the core PMU, which 32 * supports the perf metrics feature. 33 * Checking both the PERF_TYPE_RAW type and the slots event 34 * should be good enough to detect the perf metrics feature. 35 */ 36 again: 37 switch (type) { 38 case PERF_TYPE_HARDWARE: 39 case PERF_TYPE_HW_CACHE: 40 type = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT; 41 if (type) 42 goto again; 43 break; 44 case PERF_TYPE_RAW: 45 break; 46 default: 47 return false; 48 } 49 50 pmu = evsel->pmu; 51 if (pmu && perf_pmu__is_fake(pmu)) 52 pmu = NULL; 53 54 if (!pmu) { 55 while ((pmu = perf_pmus__scan_core(pmu)) != NULL) { 56 if (pmu->type == PERF_TYPE_RAW) 57 break; 58 } 59 } 60 return pmu && perf_pmu__have_event(pmu, "slots"); 61 } 62 63 bool arch_evsel__must_be_in_group(const struct evsel *evsel) 64 { 65 if (!evsel__sys_has_perf_metrics(evsel) || !evsel->name || 66 strcasestr(evsel->name, "uops_retired.slots")) 67 return false; 68 69 return arch_is_topdown_metrics(evsel) || arch_is_topdown_slots(evsel); 70 } 71 72 int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) 73 { 74 u64 event = evsel->core.attr.config & PERF_HW_EVENT_MASK; 75 u64 pmu = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT; 76 const char *event_name; 77 78 if (event < PERF_COUNT_HW_MAX && evsel__hw_names[event]) 79 event_name = evsel__hw_names[event]; 80 else 81 event_name = "unknown-hardware"; 82 83 /* The PMU type is not required for the non-hybrid platform. */ 84 if (!pmu) 85 return scnprintf(bf, size, "%s", event_name); 86 87 return scnprintf(bf, size, "%s/%s/", 88 evsel->pmu ? evsel->pmu->name : "cpu", 89 event_name); 90 } 91 92 static void ibs_l3miss_warn(void) 93 { 94 pr_warning( 95 "WARNING: Hw internally resets sampling period when L3 Miss Filtering is enabled\n" 96 "and tagged operation does not cause L3 Miss. This causes sampling period skew.\n"); 97 } 98 99 void arch__post_evsel_config(struct evsel *evsel, struct perf_event_attr *attr) 100 { 101 struct perf_pmu *evsel_pmu, *ibs_fetch_pmu, *ibs_op_pmu; 102 static int warned_once; 103 104 if (warned_once || !x86__is_amd_cpu()) 105 return; 106 107 evsel_pmu = evsel__find_pmu(evsel); 108 if (!evsel_pmu) 109 return; 110 111 ibs_fetch_pmu = perf_pmus__find("ibs_fetch"); 112 ibs_op_pmu = perf_pmus__find("ibs_op"); 113 114 if (ibs_fetch_pmu && ibs_fetch_pmu->type == evsel_pmu->type) { 115 if (attr->config & IBS_FETCH_L3MISSONLY) { 116 ibs_l3miss_warn(); 117 warned_once = 1; 118 } 119 } else if (ibs_op_pmu && ibs_op_pmu->type == evsel_pmu->type) { 120 if (attr->config & IBS_OP_L3MISSONLY) { 121 ibs_l3miss_warn(); 122 warned_once = 1; 123 } 124 } 125 } 126 127 int arch_evsel__open_strerror(struct evsel *evsel, char *msg, size_t size) 128 { 129 if (!x86__is_amd_cpu()) 130 return 0; 131 132 if (!evsel->core.attr.precise_ip && 133 !(evsel->pmu && !strncmp(evsel->pmu->name, "ibs", 3))) 134 return 0; 135 136 /* More verbose IBS errors. */ 137 if (evsel->core.attr.exclude_kernel || evsel->core.attr.exclude_user || 138 evsel->core.attr.exclude_hv || evsel->core.attr.exclude_idle || 139 evsel->core.attr.exclude_host || evsel->core.attr.exclude_guest) { 140 return scnprintf(msg, size, "AMD IBS doesn't support privilege filtering. Try " 141 "again without the privilege modifiers (like 'k') at the end."); 142 } 143 144 return 0; 145 } 146