scripts: Add gpu_load.sh script

The script converts the times in /sys/kernel/debug/gc/idle
into percent values over some time.
Tested on mx8mp.

PBB-46

scripts/gpu_load.sh

+#!/bin/bash
+
+sleeptime="${1-1000}"
+sleeptime_us="$(( sleeptime * 1000 ))"
+
+gpuidle="$(cat /sys/kernel/debug/gc/idle)"
+newline="
+"
+OLD_IFS="$IFS"
+
+decode_sysfs(){
+	prefix="$1"
+	content="$2"
+
+	IFS="$newline" 
+	for line in ${content}
+        do
+		type="${line%:*}"
+		timestamp="${line#*:}"
+		timestamp="${timestamp% ns}"
+		timestamp="${timestamp//,/}"
+		timestamp="${timestamp// /}"
+		eval "${prefix}_${type}=${timestamp}"
+	done
+}
+
+function report_load(){
+
+
+	decode_sysfs "start" "$gpuidle_prev"
+	decode_sysfs "stop" "$gpuidle"
+
+	on="$(( stop_On - start_On ))"
+	off="$(( stop_Off - start_Off ))"
+	idle="$(( stop_Idle - start_Idle ))"
+	susp="$(( stop_Suspend - start_Suspend ))"
+
+	total="$(( on + off + idle + susp ))"
+	#total="$(( sleeptime_us * 1000 ))"
+
+	on_p="$(( on * 10000 / total ))"
+	off_p="$(( off * 10000 / total ))"
+	idle_p="$(( idle * 10000 / total ))"
+	susp_p="$(( susp * 10000 / total ))"
+	
+	total_p="$(( on_p + off_p + idle_p + susp_p ))"
+	
+#	printf "$sleeptime ms: On %.1f%% Off %.1f%% Idle %.1f%% Susp %.1f%% Total %.1f%%\n" \
+#		"$(( on_p / 100 )).$(( on_p % 100 ))" \
+#		"$(( off_p / 100 )).$(( off_p % 100 ))" \
+#		"$(( idle_p / 100 )).$(( idle_p % 100 ))" \
+#		"$(( susp_p / 100 )).$(( susp_p % 100 ))" \
+#		"$(( total_p / 100 )).$(( total_p % 100 ))" 
+
+	printf "$sleeptime ms: On %.1f%% Off %.1f%% Idle %.1f%%                       \r" \
+		"$(( on_p / 100 )).$(( on_p % 100 ))" \
+		"$(( off_p / 100 )).$(( off_p % 100 ))" \
+		"$(( idle_p / 100 )).$(( idle_p % 100 ))"
+}
+
+
+while true;
+do
+	gpuidle_prev="$gpuidle"
+	usleep "$sleeptime_us"
+	gpuidle="$(cat /sys/kernel/debug/gc/idle)"
+
+	report_load
+done
+
+