tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright(C) 2015 Linaro Limited. All rights reserved.
3 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <stdbool.h>
19#include <linux/coresight-pmu.h>
20
21#include "../../util/auxtrace.h"
22#include "../../util/evlist.h"
23#include "../../util/pmu.h"
24#include "cs-etm.h"
25
26struct auxtrace_record
27*auxtrace_record__init(struct perf_evlist *evlist, int *err)
28{
29 struct perf_pmu *cs_etm_pmu;
30 struct perf_evsel *evsel;
31 bool found_etm = false;
32
33 cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
34
35 if (evlist) {
36 evlist__for_each_entry(evlist, evsel) {
37 if (cs_etm_pmu &&
38 evsel->attr.type == cs_etm_pmu->type)
39 found_etm = true;
40 }
41 }
42
43 if (found_etm)
44 return cs_etm_record_init(err);
45
46 /*
47 * Clear 'err' even if we haven't found a cs_etm event - that way perf
48 * record can still be used even if tracers aren't present. The NULL
49 * return value will take care of telling the infrastructure HW tracing
50 * isn't available.
51 */
52 *err = 0;
53 return NULL;
54}