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     echo $1
  29     exit_fail
  30 }
  31
  32 SLEEP_TIME=".1"
  33
  34 echo "Testing function probes with events:"
  35
  36 EVENT="sched:sched_switch"
  37 EVENT_ENABLE="events/sched/sched_switch/enable"
  38
  39 cnt_trace() {
  40     grep -v '^#' trace | wc -l
  41 }
  42
  43 test_event_enabled() {
  44     val=$1
  45
  46     e=`cat $EVENT_ENABLE`
  47     if [ "$e" != $val ]; then
  48         fail "Expected $val but found $e"
  49     fi
  50 }
  51
  52 run_enable_disable() {
  53     enable=$1                   # enable
  54     Enable=$2                   # Enable
  55     check_disable=$3            # 0
  56     check_enable_star=$4        # 1*
  57     check_disable_star=$5       # 0*
  58
  59     cnt=`cnt_trace`
  60     if [ $cnt -ne 0 ]; then
  61         fail "Found junk in trace file"
  62     fi
  63
  64     echo "$Enable event all the time"
  65
  66     echo $check_disable > $EVENT_ENABLE
  67     sleep $SLEEP_TIME
  68
  69     test_event_enabled $check_disable
  70
  71     echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter
  72     if [ -d ../../instances ]; then # Check instances
  73         cur=`cat set_ftrace_filter`
  74         top=`cat ../../set_ftrace_filter`
  75         if [ "$cur" = "$top" ]; then
  76             echo "This kernel is too old to support per instance filter"
  77             reset_ftrace_filter
  78             exit_unsupported
  79         fi
  80     fi
  81
  82     echo " make sure it works 5 times"
  83
  84     for i in `seq 5`; do
  85         sleep $SLEEP_TIME
  86         echo "  test $i"
  87         test_event_enabled $check_enable_star
  88
  89         echo $check_disable > $EVENT_ENABLE
  90     done
  91     sleep $SLEEP_TIME
  92     echo " make sure it's still works"
  93     test_event_enabled $check_enable_star
  94
  95     reset_ftrace_filter
  96
  97     echo " make sure it only works 3 times"
  98
  99     echo $check_disable > $EVENT_ENABLE
 100     sleep $SLEEP_TIME
 101
 102     echo "schedule:${enable}_event:$EVENT:3" > set_ftrace_filter
 103
 104     for i in `seq 3`; do
 105         sleep $SLEEP_TIME
 106         echo "  test $i"
 107         test_event_enabled $check_enable_star
 108
 109         echo $check_disable > $EVENT_ENABLE
 110     done
 111
 112     sleep $SLEEP_TIME
 113     echo " make sure it stop working"
 114     test_event_enabled $check_disable_star
 115
 116     do_reset
 117 }
 118
 119 run_enable_disable enable Enable 0 "1*" "0*"
 120 run_enable_disable disable Disable 1 "0*" "1*"