#!/bin/sh# SPDX-License-Identifier: GPL-2.0-only clear_trace() { # reset trace output    echo > trace} disable_tracing() { # stop trace recording    echo 0 > tracing_on} enable_tracing() { # start trace recording    echo 1 > tracing_on} reset_tracer() { # reset the current tracer    echo nop > current_tracer} reset_trigger_file() {    # remove action triggers first    grep -H ':on[^:]*(' $@ |    while read line; do        cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`	file=`echo $line | cut -f1 -d:`	echo "!$cmd" >> $file    done    grep -Hv ^# $@ |    while read line; do        cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`	file=`echo $line | cut -f1 -d:`	echo "!$cmd" > $file    done} reset_trigger() { # reset all current setting triggers    if [ -d events/synthetic ]; then        reset_trigger_file events/synthetic/*/trigger    fi    reset_trigger_file events/*/*/trigger} reset_events_filter() { # reset all current setting filters    grep -v ^none events/*/*/filter |    while read line; do	echo 0 > `echo $line | cut -f1 -d:`    done} reset_ftrace_filter() { # reset all triggers in set_ftrace_filter    if [ ! -f set_ftrace_filter ]; then      return 0    fi    echo > set_ftrace_filter    grep -v '^#' set_ftrace_filter | while read t; do	tr=`echo $t | cut -d: -f2`	if [ "$tr" = "" ]; then	    continue	fi	if ! grep -q "$t" set_ftrace_filter; then		continue;	fi	name=`echo $t | cut -d: -f1 | cut -d' ' -f1`	if [ $tr = "enable_event" -o $tr = "disable_event" ]; then	    tr=`echo $t | cut -d: -f2-4`	    limit=`echo $t | cut -d: -f5`	else	    tr=`echo $t | cut -d: -f2`	    limit=`echo $t | cut -d: -f3`	fi	if [ "$limit" != "unlimited" ]; then	    tr="$tr:$limit"	fi	echo "!$name:$tr" > set_ftrace_filter    done} disable_events() {    echo 0 > events/enable} clear_synthetic_events() { # reset all current synthetic events    grep -v ^# synthetic_events |    while read line; do        echo "!$line" >> synthetic_events    done} initialize_ftrace() { # Reset ftrace to initial-state# As the initial state, ftrace will be set to nop tracer,# no events, no triggers, no filters, no function filters,# no probes, and tracing on.    disable_tracing    reset_tracer    reset_trigger    reset_events_filter    reset_ftrace_filter    disable_events    [ -f set_event_pid ] && echo > set_event_pid    [ -f set_ftrace_pid ] && echo > set_ftrace_pid    [ -f set_ftrace_notrace ] && echo > set_ftrace_notrace    [ -f set_graph_function ] && echo | tee set_graph_*    [ -f stack_trace_filter ] && echo > stack_trace_filter    [ -f kprobe_events ] && echo > kprobe_events    [ -f uprobe_events ] && echo > uprobe_events    [ -f synthetic_events ] && echo > synthetic_events    [ -f snapshot ] && echo 0 > snapshot    clear_trace    enable_tracing}