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[09/11] coresight: etm-perf: Truncate the perf record if handle has no space

Message ID 1608717823-18387-10-git-send-email-anshuman.khandual@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: coresight: Enable ETE and TRBE | expand

Commit Message

Anshuman Khandual Dec. 23, 2020, 10:03 a.m. UTC
While starting off the etm event, just abort and truncate the perf record
if the perf handle as no space left. This avoids configuring both source
and sink devices in case the data cannot be consumed in perf.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
 drivers/hwtracing/coresight/coresight-etm-perf.c | 3 +++
 1 file changed, 3 insertions(+)
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diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index eb9e7e9..e776a07 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -347,6 +347,9 @@  static void etm_event_start(struct perf_event *event, int flags)
 	if (!event_data)
 		goto fail;
+	if (!handle->size)
+		goto fail_end_stop;
 	 * Check if this ETM is allowed to trace, as decided
 	 * at etm_setup_aux(). This could be due to an unreachable