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Linux kernel mirror (for testing)
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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
19static
20struct 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
54struct 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}