#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: ftrace - test for function event triggers
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# flags: instance
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#
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# Ftrace allows to add triggers to functions, such as enabling or disabling
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# tracing, enabling or disabling trace events, or recording a stack trace
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# within the ring buffer.
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#
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# This test is designed to test event triggers
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#
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# The triggers are set within the set_ftrace_filter file
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if [ ! -f set_ftrace_filter ]; then
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echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
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exit_unsupported
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fi
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do_reset() {
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reset_ftrace_filter
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reset_tracer
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disable_events
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clear_trace
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enable_tracing
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}
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fail() { # mesg
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do_reset
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echo $1
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exit_fail
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}
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SLEEP_TIME=".1"
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do_reset
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echo "Testing function probes with events:"
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EVENT="sched:sched_switch"
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EVENT_ENABLE="events/sched/sched_switch/enable"
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cnt_trace() {
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grep -v '^#' trace | wc -l
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}
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test_event_enabled() {
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val=$1
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e=`cat $EVENT_ENABLE`
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if [ "$e" != $val ]; then
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fail "Expected $val but found $e"
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fi
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}
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run_enable_disable() {
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enable=$1 # enable
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Enable=$2 # Enable
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check_disable=$3 # 0
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check_enable_star=$4 # 1*
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check_disable_star=$5 # 0*
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cnt=`cnt_trace`
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if [ $cnt -ne 0 ]; then
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fail "Found junk in trace file"
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fi
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echo "$Enable event all the time"
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echo $check_disable > $EVENT_ENABLE
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sleep $SLEEP_TIME
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test_event_enabled $check_disable
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echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter
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if [ -d ../../instances ]; then # Check instances
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cur=`cat set_ftrace_filter`
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top=`cat ../../set_ftrace_filter`
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if [ "$cur" = "$top" ]; then
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echo "This kernel is too old to support per instance filter"
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reset_ftrace_filter
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exit_unsupported
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fi
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fi
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echo " make sure it works 5 times"
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for i in `seq 5`; do
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sleep $SLEEP_TIME
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echo " test $i"
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test_event_enabled $check_enable_star
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echo $check_disable > $EVENT_ENABLE
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done
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sleep $SLEEP_TIME
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echo " make sure it's still works"
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test_event_enabled $check_enable_star
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reset_ftrace_filter
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echo " make sure it only works 3 times"
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echo $check_disable > $EVENT_ENABLE
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sleep $SLEEP_TIME
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echo "schedule:${enable}_event:$EVENT:3" > set_ftrace_filter
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for i in `seq 3`; do
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sleep $SLEEP_TIME
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echo " test $i"
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test_event_enabled $check_enable_star
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echo $check_disable > $EVENT_ENABLE
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done
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sleep $SLEEP_TIME
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echo " make sure it stop working"
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test_event_enabled $check_disable_star
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do_reset
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}
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run_enable_disable enable Enable 0 "1*" "0*"
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run_enable_disable disable Disable 1 "0*" "1*"
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