Commit a9064f67 authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

selftests: ftrace: Add test to test reading of set_ftrace_file 



The set_ftrace_file lists both functions that are filtered, as well as
function probes (triggers) that are attached to a function, like traceon or
stacktrace, etc. The reading of this file is not as trivial as most pseudo
files are, and there's been various bugs that have appeared in the past
when there's a mix of probes and functions listed. There's also a difference
when reading the file using dd with a block size of 1.

This test performs the following:

 o Resets set_ftrace_filter

 o Makes sure only "#### all functions enabled ####" is listed

    (All checks uses cat, and dd with bs=1 and bs=100)

 o Adds a traceon trigger to schedule

 o Checks if only "#### all function enabled ####" and the trigger is there.

 o Adds tracing of schedule

 o Checks if only schedule and the trigger is there

 o Adds tracing of do_IRQ as well

 o Checks if only schedule, do_IRQ and the trigger is there

 o Adds a traceon trigger to do_IRQ

 o Checks if only schedule, do_IRQ and both triggers are there

 o Removes tracing of do_IRQ

 o Checks if only schedule and both triggers are there

 o Removes tracing of schedule

 o Checks if only  "#### all functions enabled ####" and both triggers are there

 o Removes the triggers

 o Checks if only "#### all functions enabled ####" is there

 o Adds tracing of schedule

 o Checks if only schedule is there

 o Adds tracing of do_IRQ

 o Checks if only schedule and do_IRQ are there

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent d8b39e1d

tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc

0 → 100644
+132 −0
Original line number Diff line number Diff line 
#!/bin/sh

# 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

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