linux-kernel - [PATCH v2 04/17] perf tools: Add handling of itrace start events

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Date:   Fri, 24 May 2019 11:34:55 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, suzuki.poulose@....com, leo.yan@...aro.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        coresight@...ts.linaro.org
Subject: [PATCH v2 04/17] perf tools: Add handling of itrace start events

Add handling of ITRACE events in order to add the tid/pid of the executing
process to the perf tools machine infrastructure.  This information is
later retrieved when a contextID packet is found in the trace stream.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 tools/perf/util/cs-etm.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index de488b43f440..0742c50fce46 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -1657,6 +1657,29 @@ static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm,
 	return 0;
 }
 
+static int cs_etm__process_itrace_start(struct cs_etm_auxtrace *etm,
+					union perf_event *event)
+{
+	struct thread *th;
+
+	if (etm->timeless_decoding)
+		return 0;
+
+	/*
+	 * Add the tid/pid to the log so that we can get a match when
+	 * we get a contextID from the decoder.
+	 */
+	th = machine__findnew_thread(etm->machine,
+				     event->itrace_start.pid,
+				     event->itrace_start.tid);
+	if (!th)
+		return -ENOMEM;
+
+	thread__put(th);
+
+	return 0;
+}
+
 static int cs_etm__process_event(struct perf_session *session,
 				 union perf_event *event,
 				 struct perf_sample *sample,
@@ -1694,6 +1717,9 @@ static int cs_etm__process_event(struct perf_session *session,
 		return cs_etm__process_timeless_queues(etm,
 						       event->fork.tid);
 
+	if (event->header.type == PERF_RECORD_ITRACE_START)
+		return cs_etm__process_itrace_start(etm, event);
+
 	return 0;
 }
 
-- 
2.17.1