auxtrace.c

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/*
 * auxtrace.c: AUX area tracing support
 * Copyright (c) 2013-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#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;
}