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|
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - test for function traceon/off 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 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
fail() { # mesg
echo $1
exit_fail
}
SLEEP_TIME=".1"
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/sched/enable
echo '** ENABLE TRACING'
enable_tracing
cnt=`cnt_trace`
if [ $cnt -eq 0 ]; then
fail "Nothing found in trace"
fi
# powerpc uses .schedule
func="schedule"
available_file=available_filter_functions
if [ -d ../../instances -a -f ../../available_filter_functions ]; then
available_file=../../available_filter_functions
fi
x=`grep '^\.schedule$' available_filter_functions | wc -l`
if [ "$x" -eq 1 ]; then
func=".schedule"
fi
echo '** SET TRACEOFF'
echo "$func:traceoff" > set_ftrace_filter
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
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
csum1=`md5sum trace`
sleep $SLEEP_TIME
csum2=`md5sum trace`
if [ "$csum1" != "$csum2" ]; 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
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