kernel/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 <stdbool.h>
  17
  18 #include "../../util/header.h"
  19 #include "../../util/debug.h"
  20 #include "../../util/pmu.h"
  21 #include "../../util/auxtrace.h"
  22 #include "../../util/intel-pt.h"
  23 #include "../../util/intel-bts.h"
  24 #include "../../util/evlist.h"
  25
  26 static
  27 struct auxtrace_record *auxtrace_record__init_intel(struct perf_evlist *evlist,
  28                                                     int *err)
  29 {
  30         struct perf_pmu *intel_pt_pmu;
  31         struct perf_pmu *intel_bts_pmu;
  32         struct perf_evsel *evsel;
  33         bool found_pt = false;
  34         bool found_bts = false;
  35
  36         intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
  37         intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
  38
  39         if (evlist) {
  40                 evlist__for_each(evlist, evsel) {
  41                         if (intel_pt_pmu &&
  42                             evsel->attr.type == intel_pt_pmu->type)
  43                                 found_pt = true;
  44                         if (intel_bts_pmu &&
  45                             evsel->attr.type == intel_bts_pmu->type)
  46                                 found_bts = true;
  47                 }
  48         }
  49
  50         if (found_pt && found_bts) {
  51                 pr_err("intel_pt and intel_bts may not be used together\n");
  52                 *err = -EINVAL;
  53                 return NULL;
  54         }
  55
  56         if (found_pt)
  57                 return intel_pt_recording_init(err);
  58
  59         if (found_bts)
  60                 return intel_bts_recording_init(err);
  61
  62         return NULL;
  63 }
  64
  65 struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
  66                                               int *err)
  67 {
  68         char buffer[64];
  69         int ret;
  70
  71         *err = 0;
  72
  73         ret = get_cpuid(buffer, sizeof(buffer));
  74         if (ret) {
  75                 *err = ret;
  76                 return NULL;
  77         }
  78
  79         if (!strncmp(buffer, "GenuineIntel,", 13))
  80                 return auxtrace_record__init_intel(evlist, err);
  81
  82         return NULL;
  83 }