tests/perf/find_event.c

   1 /*
   2  * Copyright (C) 2016 Julien Desfossez <jdesfossez@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #include <stdio.h>
   9 #include <perfmon/pfmlib.h>
  10 #include <string.h>
  11
  12 int main(int argc, char **argv)
  13 {
  14         int ret, i;
  15         unsigned int j;
  16         pfm_pmu_info_t pinfo;
  17
  18         if (argc != 2) {
  19                 fprintf(stderr, "Usage: %s <pmu counter to find>\n"
  20                                 "ex: %s UNHALTED_REFERENCE_CYCLES\n"
  21                                 "Returns the first occurence it finds with "
  22                                 "return code 0.\n"
  23                                 "If not found returns 1, on error returns -1\n",
  24                                 argv[0], argv[0]);
  25                 ret = -1;
  26                 goto end;
  27         }
  28
  29         memset(&pinfo, 0, sizeof(pinfo));
  30         pinfo.size = sizeof(pinfo);
  31
  32         ret = pfm_initialize();
  33         if (ret != PFM_SUCCESS) {
  34                 fprintf(stderr, "Failed to initialise libpfm: %s",
  35                                 pfm_strerror(ret));
  36                 ret = -1;
  37                 goto end;
  38         }
  39
  40         pfm_for_all_pmus(j) {
  41                 ret = pfm_get_pmu_info(j, &pinfo);
  42                 if (ret != PFM_SUCCESS) {
  43                         continue;
  44                 }
  45
  46                 for (i = pinfo.first_event; i != -1; i = pfm_get_event_next(i)) {
  47                         pfm_event_info_t info =
  48                                         { .size = sizeof(pfm_event_info_t) };
  49
  50                         ret = pfm_get_event_info(i, PFM_OS_NONE, &info);
  51                         if (ret != PFM_SUCCESS) {
  52                                 fprintf(stderr, "Cannot get event info: %s\n",
  53                                                 pfm_strerror(ret));
  54                                 ret = -1;
  55                                 goto end;
  56                         }
  57
  58                         if (info.pmu != j) {
  59                                 continue;
  60                         }
  61
  62                         if (strcmp(info.name, argv[1]) == 0) {
  63                                 fprintf(stdout, "r%" PRIx64 "\n", info.code);
  64                                 ret = 0;
  65                                 goto end;
  66                         }
  67                 }
  68         }
  69
  70         ret = 1;
  71
  72 end:
  73         return ret;
  74 }