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/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	struct perf_cpu cpu = perf_cpu_map__min(evlist->core.all_cpus);
59	int ret;
60
61	*err = 0;
62
63	ret = get_cpuid(buffer, sizeof(buffer), cpu);
64	if (ret) {
65		*err = ret;
66		return NULL;
67	}
68
69	if (!strncmp(buffer, "GenuineIntel,", 13))
70		return auxtrace_record__init_intel(evlist, err);
71
72	return NULL;
73}