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|
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - test reading of set_ftrace_filter
#
# The set_ftrace_filter file of ftrace is used to list functions as well as
# triggers (probes) attached to functions. The code to read this file is not
# straight forward and has had various bugs in the past. This test is designed
# to add functions and triggers to that file in various ways and read that
# file in various ways (cat vs dd).
#
# 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_tracer
reset_ftrace_filter
disable_events
clear_trace
enable_tracing
}
fail() { # mesg
do_reset
echo $1
exit $FAIL
}
do_reset
FILTER=set_ftrace_filter
FUNC1="schedule"
FUNC2="do_IRQ"
ALL_FUNCS="#### all functions enabled ####"
test_func() {
if ! echo "$1" | grep -q "^$2\$"; then
return 0
fi
echo "$1" | grep -v "^$2\$"
return 1
}
check_set_ftrace_filter() {
cat=`cat $FILTER`
dd1=`dd if=$FILTER bs=1 | grep -v -e 'records in' -e 'records out' -e 'bytes copied'`
dd100=`dd if=$FILTER bs=100 | grep -v -e 'records in' -e 'records out' -e 'bytes copied'`
echo "Testing '$@'"
while [ $# -gt 0 ]; do
echo "test $1"
if cat=`test_func "$cat" "$1"`; then
return 0
fi
if dd1=`test_func "$dd1" "$1"`; then
return 0
fi
if dd100=`test_func "$dd100" "$1"`; then
return 0
fi
shift
done
if [ -n "$cat" ]; then
return 0
fi
if [ -n "$dd1" ]; then
return 0
fi
if [ -n "$dd100" ]; then
return 0
fi
return 1;
}
if check_set_ftrace_filter "$ALL_FUNCS"; then
fail "Expected only $ALL_FUNCS"
fi
echo "$FUNC1:traceoff" > set_ftrace_filter
if check_set_ftrace_filter "$ALL_FUNCS" "$FUNC1:traceoff:unlimited"; then
fail "Expected $ALL_FUNCS and $FUNC1:traceoff:unlimited"
fi
echo "$FUNC1" > set_ftrace_filter
if check_set_ftrace_filter "$FUNC1" "$FUNC1:traceoff:unlimited"; then
fail "Expected $FUNC1 and $FUNC1:traceoff:unlimited"
fi
echo "$FUNC2" >> set_ftrace_filter
if check_set_ftrace_filter "$FUNC1" "$FUNC2" "$FUNC1:traceoff:unlimited"; then
fail "Expected $FUNC1 $FUNC2 and $FUNC1:traceoff:unlimited"
fi
echo "$FUNC2:traceoff" >> set_ftrace_filter
if check_set_ftrace_filter "$FUNC1" "$FUNC2" "$FUNC1:traceoff:unlimited" "$FUNC2:traceoff:unlimited"; then
fail "Expected $FUNC1 $FUNC2 $FUNC1:traceoff:unlimited and $FUNC2:traceoff:unlimited"
fi
echo "$FUNC1" > set_ftrace_filter
if check_set_ftrace_filter "$FUNC1" "$FUNC1:traceoff:unlimited" "$FUNC2:traceoff:unlimited"; then
fail "Expected $FUNC1 $FUNC1:traceoff:unlimited and $FUNC2:traceoff:unlimited"
fi
echo > set_ftrace_filter
if check_set_ftrace_filter "$ALL_FUNCS" "$FUNC1:traceoff:unlimited" "$FUNC2:traceoff:unlimited"; then
fail "Expected $ALL_FUNCS $FUNC1:traceoff:unlimited and $FUNC2:traceoff:unlimited"
fi
reset_ftrace_filter
if check_set_ftrace_filter "$ALL_FUNCS"; then
fail "Expected $ALL_FUNCS"
fi
echo "$FUNC1" > set_ftrace_filter
if check_set_ftrace_filter "$FUNC1" ; then
fail "Expected $FUNC1"
fi
echo "$FUNC2" >> set_ftrace_filter
if check_set_ftrace_filter "$FUNC1" "$FUNC2" ; then
fail "Expected $FUNC1 and $FUNC2"
fi
do_reset
exit 0
|
