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 evlist *evlist,
  20                                                     int *err)
  21 {
  22         struct perf_pmu *intel_pt_pmu;
  23         struct perf_pmu *intel_bts_pmu;
  24         struct 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         if (intel_pt_pmu)
  30                 intel_pt_pmu->auxtrace = true;
  31         intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
  32         if (intel_bts_pmu)
  33                 intel_bts_pmu->auxtrace = true;
  34
  35         evlist__for_each_entry(evlist, evsel) {
  36                 if (intel_pt_pmu && evsel->core.attr.type == intel_pt_pmu->type)
  37                         found_pt = true;
  38                 if (intel_bts_pmu && evsel->core.attr.type == intel_bts_pmu->type)
  39                         found_bts = true;
  40         }
  41
  42         if (found_pt && found_bts) {
  43                 pr_err("intel_pt and intel_bts may not be used together\n");
  44                 *err = -EINVAL;
  45                 return NULL;
  46         }
  47
  48         if (found_pt)
  49                 return intel_pt_recording_init(err);
  50
  51         if (found_bts)
  52                 return intel_bts_recording_init(err);
  53
  54         return NULL;
  55 }
  56
  57 struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,
  58                                               int *err)
  59 {
  60         char buffer[64];
  61         int ret;
  62
  63         *err = 0;
  64
  65         ret = get_cpuid(buffer, sizeof(buffer));
  66         if (ret) {
  67                 *err = ret;
  68                 return NULL;
  69         }
  70
  71         if (!strncmp(buffer, "GenuineIntel,", 13))
  72                 return auxtrace_record__init_intel(evlist, err);
  73
  74         return NULL;
  75 }