selftests: ftrace: Add a test to test function triggers to start and stop tracing

#!/bin/sh

# description: ftrace - test for function traceon/off triggers

#

# Ftrace allows to add triggers to functions, such as enabling or disabling

# tracing, enabling or disabling trace events, or recording a stack trace

# within the ring buffer.

#

# This test is designed to test enabling and disabling tracing triggers

#

# The triggers are set within the set_ftrace_filter file

if [ ! -f set_ftrace_filter ]; then

    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"

    exit_unsupported

fi

do_reset() {

    reset_ftrace_filter

    reset_tracer

    disable_events

    clear_trace

    enable_tracing

}

fail() { # mesg

    do_reset

    echo $1

    exit $FAIL

}

SLEEP_TIME=".1"

do_reset

echo "Testing function probes with enabling disabling tracing:"

cnt_trace() {

    grep -v '^#' trace | wc -l

}

echo '** DISABLE TRACING'

disable_tracing

clear_trace

cnt=`cnt_trace`

if [ $cnt -ne 0 ]; then

    fail "Found junk in trace"

fi

echo '** ENABLE EVENTS'

echo 1 > events/enable

echo '** ENABLE TRACING'

enable_tracing

cnt=`cnt_trace`

if [ $cnt -eq 0 ]; then

   fail "Nothing found in trace"

fi

# powerpc uses .schedule

func="schedule"

x=`grep '^\.schedule$' available_filter_functions | wc -l`

if [ "$x" -eq 1 ]; then

   func=".schedule"

fi

echo '** SET TRACEOFF'

echo "$func:traceoff" > set_ftrace_filter

cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 1 ]; then

   fail "Did not find traceoff trigger"

fi

cnt=`cnt_trace`

sleep $SLEEP_TIME

cnt2=`cnt_trace`

if [ $cnt -ne $cnt2 ]; then

   fail "Tracing is not stopped"

fi

on=`cat tracing_on`

if [ $on != "0" ]; then

    fail "Tracing is not off"

fi

line1=`cat trace | tail -1`

sleep $SLEEP_TIME

line2=`cat trace | tail -1`

if [ "$line1" != "$line2" ]; then

    fail "Tracing file is still changing"

fi

clear_trace

cnt=`cnt_trace`

if [ $cnt -ne 0 ]; then

    fail "Tracing is still happeing"

fi

echo "!$func:traceoff" >> set_ftrace_filter

cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 0 ]; then

    fail "traceoff trigger still exists"

fi

on=`cat tracing_on`

if [ $on != "0" ]; then

    fail "Tracing is started again"

fi

echo "$func:traceon" > set_ftrace_filter

cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 1 ]; then

    fail "traceon trigger not found"

fi

cnt=`cnt_trace`

if [ $cnt -eq 0 ]; then

   fail "Tracing did not start"

fi

on=`cat tracing_on`

if [ $on != "1" ]; then

    fail "Tracing was not enabled"

fi

echo "!$func:traceon" >> set_ftrace_filter

cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 0 ]; then

   fail "traceon trigger still exists"

fi

check_sleep() {

    val=$1

    sleep $SLEEP_TIME

    cat set_ftrace_filter

    on=`cat tracing_on`

    if [ $on != "$val" ]; then

	fail "Expected tracing_on to be $val, but it was $on"

    fi

}

echo "$func:traceoff:3" > set_ftrace_filter

check_sleep "0"

echo 1 > tracing_on

check_sleep "0"

echo 1 > tracing_on

check_sleep "0"

echo 1 > tracing_on

check_sleep "1"

echo "!$func:traceoff:0" > set_ftrace_filter

if grep -e traceon -e traceoff set_ftrace_filter; then

    fail "Tracing on and off triggers still exist"

fi

disable_events

exit 0