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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - test for function event triggers
# flags: instance
#
# 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 event 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 events:"
EVENT="sched:sched_switch"
EVENT_ENABLE="events/sched/sched_switch/enable"
cnt_trace() {
grep -v '^#' trace | wc -l
}
test_event_enabled() {
val=$1
check_times=10 # wait for 10 * SLEEP_TIME at most
while [ $check_times -ne 0 ]; do
e=`cat $EVENT_ENABLE`
if [ "$e" = $val ]; then
return 0
fi
sleep $SLEEP_TIME
check_times=$((check_times - 1))
done
fail "Expected $val but found $e"
}
run_enable_disable() {
enable=$1 # enable
Enable=$2 # Enable
check_disable=$3 # 0
check_enable_star=$4 # 1*
check_disable_star=$5 # 0*
cnt=`cnt_trace`
if [ $cnt -ne 0 ]; then
fail "Found junk in trace file"
fi
echo "$Enable event all the time"
echo $check_disable > $EVENT_ENABLE
sleep $SLEEP_TIME
test_event_enabled $check_disable
echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter
if [ -d ../../instances ]; then # Check instances
cur=`cat set_ftrace_filter`
top=`cat ../../set_ftrace_filter`
if [ "$cur" = "$top" ]; then
echo "This kernel is too old to support per instance filter"
reset_ftrace_filter
exit_unsupported
fi
fi
echo " make sure it works 5 times"
for i in `seq 5`; do
sleep $SLEEP_TIME
echo " test $i"
test_event_enabled $check_enable_star
echo $check_disable > $EVENT_ENABLE
done
sleep $SLEEP_TIME
echo " make sure it's still works"
test_event_enabled $check_enable_star
reset_ftrace_filter
echo " make sure it only works 3 times"
echo $check_disable > $EVENT_ENABLE
sleep $SLEEP_TIME
echo "schedule:${enable}_event:$EVENT:3" > set_ftrace_filter
for i in `seq 3`; do
sleep $SLEEP_TIME
echo " test $i"
test_event_enabled $check_enable_star
echo $check_disable > $EVENT_ENABLE
done
sleep $SLEEP_TIME
echo " make sure it stop working"
test_event_enabled $check_disable_star
do_reset
}
run_enable_disable enable Enable 0 "1*" "0*"
run_enable_disable disable Disable 1 "0*" "1*"
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