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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * auxtrace.c: AUX area tracing support
   4  * Copyright (c) 2013-2014, Intel Corporation.
   5  */
   6
   7 #include <errno.h>
   8 #include <stdbool.h>
   9
  10 #include "../../../util/header.h"
  11 #include "../../../util/debug.h"
  12 #include "../../../util/pmu.h"
  13 #include "../../../util/pmus.h"
  14 #include "../../../util/auxtrace.h"
  15 #include "../../../util/intel-pt.h"
  16 #include "../../../util/intel-bts.h"
  17 #include "../../../util/evlist.h"
  18
  19 static
  20 struct auxtrace_record *auxtrace_record__init_intel(struct evlist *evlist,
  21                                                     int *err)
  22 {
  23         struct perf_pmu *intel_pt_pmu;
  24         struct perf_pmu *intel_bts_pmu;
  25         struct evsel *evsel;
  26         bool found_pt = false;
  27         bool found_bts = false;
  28
  29         intel_pt_pmu = perf_pmus__find(INTEL_PT_PMU_NAME);
  30         intel_bts_pmu = perf_pmus__find(INTEL_BTS_PMU_NAME);
  31
  32         evlist__for_each_entry(evlist, evsel) {
  33                 if (intel_pt_pmu && evsel->core.attr.type == intel_pt_pmu->type)
  34                         found_pt = true;
  35                 if (intel_bts_pmu && evsel->core.attr.type == intel_bts_pmu->type)
  36                         found_bts = true;
  37         }
  38
  39         if (found_pt && found_bts) {
  40                 pr_err("intel_pt and intel_bts may not be used together\n");
  41                 *err = -EINVAL;
  42                 return NULL;
  43         }
  44
  45         if (found_pt)
  46                 return intel_pt_recording_init(err);
  47
  48         if (found_bts)
  49                 return intel_bts_recording_init(err);
  50
  51         return NULL;
  52 }
  53
  54 struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,
  55                                               int *err)
  56 {
  57         char buffer[64];
  58         int ret;
  59
  60         *err = 0;
  61
  62         ret = get_cpuid(buffer, sizeof(buffer));
  63         if (ret) {
  64                 *err = ret;
  65                 return NULL;
  66         }
  67
  68         if (!strncmp(buffer, "GenuineIntel,", 13))
  69                 return auxtrace_record__init_intel(evlist, err);
  70
  71         return NULL;
  72 }