logger: Log to the FTrace buffer if tracing is enabled

Extend the logger such that it will detect the tracing system, and also
append print statement to this ring buffer.

This provides the relevant logging output interspersed in the ftrace
logs for an effective solution to identifying the actions that caused
the traces to occur

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/scripts/logger.sh b/scripts/logger.sh
index 8123f0c..8412b0b 100755
--- a/scripts/logger.sh
+++ b/scripts/logger.sh
@@ -6,6 +6,17 @@ now() {
 
 label=${1:+ [$1]}
 
+TRACE_MARKER=/sys/kernel/debug/tracing/trace_marker
+if [ -e $TRACE_MARKER ]; then
+	extra_log_files=$TRACE_MARKER
+fi
+
 while read line ; do
-	echo "$(now)$label $line"
+	newline="$(now)$label $line"
+
+	echo "$newline"
+
+	for f in $extra_log_files; do
+		echo "$newline" >> $f;
+	done;
 done