a818c563ae
Coresight ETMs are IP blocks used to perform HW assisted tracing on a CPU core. This patch introduce the required auxiliary API functions allowing the perf core to interact with a tracer. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1474041004-13956-4-git-send-email-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/*
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* Copyright(C) 2015 Linaro Limited. All rights reserved.
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* Author: Mathieu Poirier <mathieu.poirier@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <linux/coresight-pmu.h>
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#include "../../util/auxtrace.h"
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#include "../../util/evlist.h"
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#include "../../util/pmu.h"
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#include "cs-etm.h"
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struct auxtrace_record
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*auxtrace_record__init(struct perf_evlist *evlist, int *err)
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{
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struct perf_pmu *cs_etm_pmu;
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struct perf_evsel *evsel;
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bool found_etm = false;
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cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
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if (evlist) {
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evlist__for_each_entry(evlist, evsel) {
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if (cs_etm_pmu &&
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evsel->attr.type == cs_etm_pmu->type)
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found_etm = true;
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}
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}
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if (found_etm)
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return cs_etm_record_init(err);
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/*
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* Clear 'err' even if we haven't found a cs_etm event - that way perf
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* record can still be used even if tracers aren't present. The NULL
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* return value will take care of telling the infrastructure HW tracing
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* isn't available.
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*/
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*err = 0;
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return NULL;
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}
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