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 # The triggers are set within the set_ftrace_filter file
   7 # requires: set_ftrace_filter
   8 #
   9 # Ftrace allows to add triggers to functions, such as enabling or disabling
  10 # tracing, enabling or disabling trace events, or recording a stack trace
  11 # within the ring buffer.
  12 #
  13 # This test is designed to test event triggers
  14
  15 do_reset() {
  16     reset_ftrace_filter
  17     reset_tracer
  18     disable_events
  19     clear_trace
  20     enable_tracing
  21 }
  22
  23 fail() { # mesg
  24     echo $1
  25     exit_fail
  26 }
  27
  28 SLEEP_TIME=".1"
  29
  30 echo "Testing function probes with events:"
  31
  32 EVENT="sched:sched_switch"
  33 EVENT_ENABLE="events/sched/sched_switch/enable"
  34
  35 cnt_trace() {
  36     grep -v '^#' trace | wc -l
  37 }
  38
  39 test_event_enabled() {
  40     val=$1
  41
  42     e=`cat $EVENT_ENABLE`
  43     if [ "$e" != $val ]; then
  44         fail "Expected $val but found $e"
  45     fi
  46 }
  47
  48 run_enable_disable() {
  49     enable=$1                   # enable
  50     Enable=$2                   # Enable
  51     check_disable=$3            # 0
  52     check_enable_star=$4        # 1*
  53     check_disable_star=$5       # 0*
  54
  55     cnt=`cnt_trace`
  56     if [ $cnt -ne 0 ]; then
  57         fail "Found junk in trace file"
  58     fi
  59
  60     echo "$Enable event all the time"
  61
  62     echo $check_disable > $EVENT_ENABLE
  63     sleep $SLEEP_TIME
  64
  65     test_event_enabled $check_disable
  66
  67     echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter
  68     if [ -d ../../instances ]; then # Check instances
  69         cur=`cat set_ftrace_filter`
  70         top=`cat ../../set_ftrace_filter`
  71         if [ "$cur" = "$top" ]; then
  72             echo "This kernel is too old to support per instance filter"
  73             reset_ftrace_filter
  74             exit_unsupported
  75         fi
  76     fi
  77
  78     echo " make sure it works 5 times"
  79
  80     for i in `seq 5`; do
  81         sleep $SLEEP_TIME
  82         echo "  test $i"
  83         test_event_enabled $check_enable_star
  84
  85         echo $check_disable > $EVENT_ENABLE
  86     done
  87     sleep $SLEEP_TIME
  88     echo " make sure it's still works"
  89     test_event_enabled $check_enable_star
  90
  91     reset_ftrace_filter
  92
  93     echo " make sure it only works 3 times"
  94
  95     echo $check_disable > $EVENT_ENABLE
  96     sleep $SLEEP_TIME
  97
  98     echo "schedule:${enable}_event:$EVENT:3" > set_ftrace_filter
  99
 100     for i in `seq 3`; do
 101         sleep $SLEEP_TIME
 102         echo "  test $i"
 103         test_event_enabled $check_enable_star
 104
 105         echo $check_disable > $EVENT_ENABLE
 106     done
 107
 108     sleep $SLEEP_TIME
 109     echo " make sure it stop working"
 110     test_event_enabled $check_disable_star
 111
 112     do_reset
 113 }
 114
 115 run_enable_disable enable Enable 0 "1*" "0*"
 116 run_enable_disable disable Disable 1 "0*" "1*"