alistair23-linux/tools/perf/arch/x86/util/auxtrace.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * auxtrace.c: AUX area tracing support
 * Copyright (c) 2013-2014, Intel Corporation.
 */

#include <errno.h>
#include <stdbool.h>

#include "../../util/header.h"
#include "../../util/debug.h"
#include "../../util/pmu.h"
#include "../../util/auxtrace.h"
#include "../../util/intel-pt.h"
#include "../../util/intel-bts.h"
#include "../../util/evlist.h"

static
struct auxtrace_record *auxtrace_record__init_intel(struct perf_evlist *evlist,
						    int *err)
{
	struct perf_pmu *intel_pt_pmu;
	struct perf_pmu *intel_bts_pmu;
	struct perf_evsel *evsel;
	bool found_pt = false;
	bool found_bts = false;

	intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
	intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);

	evlist__for_each_entry(evlist, evsel) {
		if (intel_pt_pmu && evsel->attr.type == intel_pt_pmu->type)
			found_pt = true;
		if (intel_bts_pmu && evsel->attr.type == intel_bts_pmu->type)
			found_bts = true;
	}

	if (found_pt && found_bts) {
		pr_err("intel_pt and intel_bts may not be used together\n");
		*err = -EINVAL;
		return NULL;
	}

	if (found_pt)
		return intel_pt_recording_init(err);

	if (found_bts)
		return intel_bts_recording_init(err);

	return NULL;
}

struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
					      int *err)
{
	char buffer[64];
	int ret;

	*err = 0;

	ret = get_cpuid(buffer, sizeof(buffer));
	if (ret) {
		*err = ret;
		return NULL;
	}

	if (!strncmp(buffer, "GenuineIntel,", 13))
		return auxtrace_record__init_intel(evlist, err);

	return NULL;
}