tools/perf/arch/arm64/util/pmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <internal/cpumap.h>
   4 #include "../../../util/cpumap.h"
   5 #include "../../../util/pmu.h"
   6 #include "../../../util/pmus.h"
   7 #include <api/fs/fs.h>
   8 #include <math.h>
   9
  10 static struct perf_pmu *pmu__find_core_pmu(void)
  11 {
  12         struct perf_pmu *pmu = NULL;
  13
  14         while ((pmu = perf_pmus__scan_core(pmu))) {
  15                 /*
  16                  * The cpumap should cover all CPUs. Otherwise, some CPUs may
  17                  * not support some events or have different event IDs.
  18                  */
  19                 if (RC_CHK_ACCESS(pmu->cpus)->nr != cpu__max_cpu().cpu)
  20                         return NULL;
  21
  22                 return pmu;
  23         }
  24         return NULL;
  25 }
  26
  27 const struct pmu_metrics_table *pmu_metrics_table__find(void)
  28 {
  29         struct perf_pmu *pmu = pmu__find_core_pmu();
  30
  31         if (pmu)
  32                 return perf_pmu__find_metrics_table(pmu);
  33
  34         return NULL;
  35 }
  36
  37 const struct pmu_events_table *pmu_events_table__find(void)
  38 {
  39         struct perf_pmu *pmu = pmu__find_core_pmu();
  40
  41         if (pmu)
  42                 return perf_pmu__find_events_table(pmu);
  43
  44         return NULL;
  45 }
  46
  47 double perf_pmu__cpu_slots_per_cycle(void)
  48 {
  49         char path[PATH_MAX];
  50         unsigned long long slots = 0;
  51         struct perf_pmu *pmu = pmu__find_core_pmu();
  52
  53         if (pmu) {
  54                 perf_pmu__pathname_scnprintf(path, sizeof(path),
  55                                              pmu->name, "caps/slots");
  56                 /*
  57                  * The value of slots is not greater than 32 bits, but
  58                  * filename__read_int can't read value with 0x prefix,
  59                  * so use filename__read_ull instead.
  60                  */
  61                 filename__read_ull(path, &slots);
  62         }
  63
  64         return slots ? (double)slots : NAN;
  65 }