#!/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
|
|
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 [ $cnt -eq 0 ]; then
|
fail "Nothing found in trace"
|
fi
|
|
# powerpc uses .schedule
|
func="schedule"
|
available_file=available_filter_functions
|
if [ -d ../../instances -a -f ../../available_filter_functions ]; then
|
available_file=../../available_filter_functions
|
fi
|
x=`grep '^\.schedule$' 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
|
