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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: ftrace - test for function event triggers
   4 # flags: instance
   5 #
   6 # Ftrace allows to add triggers to functions, such as enabling or disabling
   7 # tracing, enabling or disabling trace events, or recording a stack trace
   8 # within the ring buffer.
   9 #
  10 # This test is designed to test event triggers
  11 #
  12
  13 # The triggers are set within the set_ftrace_filter file
  14 if [ ! -f set_ftrace_filter ]; then
  15     echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
  16     exit_unsupported
  17 fi
  18
  19 do_reset() {
  20     reset_ftrace_filter
  21     reset_tracer
  22     disable_events
  23     clear_trace
  24     enable_tracing
  25 }
  26
  27 fail() { # mesg
  28     do_reset
  29     echo $1
  30     exit_fail
  31 }
  32
  33 SLEEP_TIME=".1"
  34
  35 do_reset
  36
  37 echo "Testing function probes with events:"
  38
  39 EVENT="sched:sched_switch"
  40 EVENT_ENABLE="events/sched/sched_switch/enable"
  41
  42 cnt_trace() {
  43     grep -v '^#' trace | wc -l
  44 }
  45
  46 test_event_enabled() {
  47     val=$1
  48
  49     e=`cat $EVENT_ENABLE`
  50     if [ "$e" != $val ]; then
  51         fail "Expected $val but found $e"
  52     fi
  53 }
  54
  55 run_enable_disable() {
  56     enable=$1                   # enable
  57     Enable=$2                   # Enable
  58     check_disable=$3            # 0
  59     check_enable_star=$4        # 1*
  60     check_disable_star=$5       # 0*
  61
  62     cnt=`cnt_trace`
  63     if [ $cnt -ne 0 ]; then
  64         fail "Found junk in trace file"
  65     fi
  66
  67     echo "$Enable event all the time"
  68
  69     echo $check_disable > $EVENT_ENABLE
  70     sleep $SLEEP_TIME
  71
  72     test_event_enabled $check_disable
  73
  74     echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter
  75     if [ -d ../../instances ]; then # Check instances
  76         cur=`cat set_ftrace_filter`
  77         top=`cat ../../set_ftrace_filter`
  78         if [ "$cur" = "$top" ]; then
  79             echo "This kernel is too old to support per instance filter"
  80             reset_ftrace_filter
  81             exit_unsupported
  82         fi
  83     fi
  84
  85     echo " make sure it works 5 times"
  86
  87     for i in `seq 5`; do
  88         sleep $SLEEP_TIME
  89         echo "  test $i"
  90         test_event_enabled $check_enable_star
  91
  92         echo $check_disable > $EVENT_ENABLE
  93     done
  94     sleep $SLEEP_TIME
  95     echo " make sure it's still works"
  96     test_event_enabled $check_enable_star
  97
  98     reset_ftrace_filter
  99
 100     echo " make sure it only works 3 times"
 101
 102     echo $check_disable > $EVENT_ENABLE
 103     sleep $SLEEP_TIME
 104
 105     echo "schedule:${enable}_event:$EVENT:3" > set_ftrace_filter
 106
 107     for i in `seq 3`; do
 108         sleep $SLEEP_TIME
 109         echo "  test $i"
 110         test_event_enabled $check_enable_star
 111
 112         echo $check_disable > $EVENT_ENABLE
 113     done
 114
 115     sleep $SLEEP_TIME
 116     echo " make sure it stop working"
 117     test_event_enabled $check_disable_star
 118
 119     do_reset
 120 }
 121
 122 run_enable_disable enable Enable 0 "1*" "0*"
 123 run_enable_disable disable Disable 1 "0*" "1*"