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