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

   1 /*
   2  * auxtrace.c: AUX area tracing support
   3  * Copyright (c) 2013-2014, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15
  16 #include <errno.h>
  17 #include <stdbool.h>
  18
  19 #include "../../util/header.h"
  20 #include "../../util/debug.h"
  21 #include "../../util/pmu.h"
  22 #include "../../util/auxtrace.h"
  23 #include "../../util/intel-pt.h"
  24 #include "../../util/intel-bts.h"
  25 #include "../../util/evlist.h"
  26
  27 static
  28 struct auxtrace_record *auxtrace_record__init_intel(struct perf_evlist *evlist,
  29                                                     int *err)
  30 {
  31         struct perf_pmu *intel_pt_pmu;
  32         struct perf_pmu *intel_bts_pmu;
  33         struct perf_evsel *evsel;
  34         bool found_pt = false;
  35         bool found_bts = false;
  36
  37         intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
  38         intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
  39
  40         if (evlist) {
  41                 evlist__for_each_entry(evlist, evsel) {
  42                         if (intel_pt_pmu &&
  43                             evsel->attr.type == intel_pt_pmu->type)
  44                                 found_pt = true;
  45                         if (intel_bts_pmu &&
  46                             evsel->attr.type == intel_bts_pmu->type)
  47                                 found_bts = true;
  48                 }
  49         }
  50
  51         if (found_pt && found_bts) {
  52                 pr_err("intel_pt and intel_bts may not be used together\n");
  53                 *err = -EINVAL;
  54                 return NULL;
  55         }
  56
  57         if (found_pt)
  58                 return intel_pt_recording_init(err);
  59
  60         if (found_bts)
  61                 return intel_bts_recording_init(err);
  62
  63         return NULL;
  64 }
  65
  66 struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
  67                                               int *err)
  68 {
  69         char buffer[64];
  70         int ret;
  71
  72         *err = 0;
  73
  74         ret = get_cpuid(buffer, sizeof(buffer));
  75         if (ret) {
  76                 *err = ret;
  77                 return NULL;
  78         }
  79
  80         if (!strncmp(buffer, "GenuineIntel,", 13))
  81                 return auxtrace_record__init_intel(evlist, err);
  82
  83         return NULL;
  84 }