tools/perf/arch/x86/util/evsel.c

   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         const char *pmu_name = evsel->pmu_name ? evsel->pmu_name : "cpu";
  25
  26         /*
  27          * The PERF_TYPE_RAW type is the core PMU type, e.g., "cpu" PMU
  28          * on a non-hybrid machine, "cpu_core" PMU on a hybrid machine.
  29          * The slots event is only available for the core PMU, which
  30          * supports the perf metrics feature.
  31          * Checking both the PERF_TYPE_RAW type and the slots event
  32          * should be good enough to detect the perf metrics feature.
  33          */
  34         if ((evsel->core.attr.type == PERF_TYPE_RAW) &&
  35             perf_pmus__have_event(pmu_name, "slots"))
  36                 return true;
  37
  38         return false;
  39 }
  40
  41 bool arch_evsel__must_be_in_group(const struct evsel *evsel)
  42 {
  43         if (!evsel__sys_has_perf_metrics(evsel) || !evsel->name ||
  44             strcasestr(evsel->name, "uops_retired.slots"))
  45                 return false;
  46
  47         return strcasestr(evsel->name, "topdown") || strcasestr(evsel->name, "slots");
  48 }
  49
  50 int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
  51 {
  52         u64 event = evsel->core.attr.config & PERF_HW_EVENT_MASK;
  53         u64 pmu = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT;
  54         const char *event_name;
  55
  56         if (event < PERF_COUNT_HW_MAX && evsel__hw_names[event])
  57                 event_name = evsel__hw_names[event];
  58         else
  59                 event_name = "unknown-hardware";
  60
  61         /* The PMU type is not required for the non-hybrid platform. */
  62         if (!pmu)
  63                 return  scnprintf(bf, size, "%s", event_name);
  64
  65         return scnprintf(bf, size, "%s/%s/",
  66                          evsel->pmu_name ? evsel->pmu_name : "cpu",
  67                          event_name);
  68 }
  69
  70 static void ibs_l3miss_warn(void)
  71 {
  72         pr_warning(
  73 "WARNING: Hw internally resets sampling period when L3 Miss Filtering is enabled\n"
  74 "and tagged operation does not cause L3 Miss. This causes sampling period skew.\n");
  75 }
  76
  77 void arch__post_evsel_config(struct evsel *evsel, struct perf_event_attr *attr)
  78 {
  79         struct perf_pmu *evsel_pmu, *ibs_fetch_pmu, *ibs_op_pmu;
  80         static int warned_once;
  81
  82         if (warned_once || !x86__is_amd_cpu())
  83                 return;
  84
  85         evsel_pmu = evsel__find_pmu(evsel);
  86         if (!evsel_pmu)
  87                 return;
  88
  89         ibs_fetch_pmu = perf_pmus__find("ibs_fetch");
  90         ibs_op_pmu = perf_pmus__find("ibs_op");
  91
  92         if (ibs_fetch_pmu && ibs_fetch_pmu->type == evsel_pmu->type) {
  93                 if (attr->config & IBS_FETCH_L3MISSONLY) {
  94                         ibs_l3miss_warn();
  95                         warned_once = 1;
  96                 }
  97         } else if (ibs_op_pmu && ibs_op_pmu->type == evsel_pmu->type) {
  98                 if (attr->config & IBS_OP_L3MISSONLY) {
  99                         ibs_l3miss_warn();
 100                         warned_once = 1;
 101                 }
 102         }
 103 }
 104
 105 int arch_evsel__open_strerror(struct evsel *evsel, char *msg, size_t size)
 106 {
 107         if (!x86__is_amd_cpu())
 108                 return 0;
 109
 110         if (!evsel->core.attr.precise_ip &&
 111             !(evsel->pmu_name && !strncmp(evsel->pmu_name, "ibs", 3)))
 112                 return 0;
 113
 114         /* More verbose IBS errors. */
 115         if (evsel->core.attr.exclude_kernel || evsel->core.attr.exclude_user ||
 116             evsel->core.attr.exclude_hv || evsel->core.attr.exclude_idle ||
 117             evsel->core.attr.exclude_host || evsel->core.attr.exclude_guest) {
 118                 return scnprintf(msg, size, "AMD IBS doesn't support privilege filtering. Try "
 119                                  "again without the privilege modifiers (like 'k') at the end.");
 120         }
 121
 122         return 0;
 123 }