linux-kernel - [RFC PATCH] perf tools: cs-etm: fix endless record after being terminated

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Message-ID: <20200102074144.10407-1-liwei391@huawei.com>
Date:   Thu, 2 Jan 2020 15:41:44 +0800
From:   Wei Li <liwei391@...wei.com>
To:     <acme@...nel.org>, <mark.rutland@....com>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>, <suzuki.poulose@....com>,
        <mathieu.poirier@...aro.org>, <ilubashe@...mai.com>
CC:     <peterz@...radead.org>, <mingo@...hat.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <huawei.libin@...wei.com>
Subject: [RFC PATCH] perf tools: cs-etm: fix endless record after being terminated

In __cmd_record(), when receiving SIGINT(ctrl + c), a done flag will
be set and the event list will be disabled by evlist__disable() once.

While in auxtrace_record.read_finish(), the related events will be
enabled again, if they are continuous, the recording seems to be endless.

If the cs_etm event is disabled, we don't enable it again here.

Note: This patch is NOT tested since i don't have such a machine with
coresight feature, but the code seems buggy same as arm-spe and intel-pt.

Signed-off-by: Wei Li <liwei391@...wei.com>
---
 tools/perf/arch/arm/util/cs-etm.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index ede040cf82ad..1893a0e3b1e1 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -865,9 +865,13 @@ static int cs_etm_read_finish(struct auxtrace_record *itr, int idx)
 	struct evsel *evsel;
 
 	evlist__for_each_entry(ptr->evlist, evsel) {
-		if (evsel->core.attr.type == ptr->cs_etm_pmu->type)
-			return perf_evlist__enable_event_idx(ptr->evlist,
-							     evsel, idx);
+		if (evsel->core.attr.type == ptr->cs_etm_pmu->type) {
+			if (evsel->disabled)
+				return 0;
+			else
+				return perf_evlist__enable_event_idx(
+						ptr->evlist, evsel, idx);
+		}
 	}
 
 	return -EINVAL;
-- 
2.17.1