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     check_times=10              # wait for 10 * SLEEP_TIME at most
  49
  50     while [ $check_times -ne 0 ]; do
  51         e=`cat $EVENT_ENABLE`
  52         if [ "$e" = $val ]; then
  53             return 0
  54         fi
  55         sleep $SLEEP_TIME
  56         check_times=$((check_times - 1))
  57     done
  58
  59     fail "Expected $val but found $e"
  60 }
  61
  62 run_enable_disable() {
  63     enable=$1                   # enable
  64     Enable=$2                   # Enable
  65     check_disable=$3            # 0
  66     check_enable_star=$4        # 1*
  67     check_disable_star=$5       # 0*
  68
  69     cnt=`cnt_trace`
  70     if [ $cnt -ne 0 ]; then
  71         fail "Found junk in trace file"
  72     fi
  73
  74     echo "$Enable event all the time"
  75
  76     echo $check_disable > $EVENT_ENABLE
  77     sleep $SLEEP_TIME
  78
  79     test_event_enabled $check_disable
  80
  81     echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter
  82     if [ -d ../../instances ]; then # Check instances
  83         cur=`cat set_ftrace_filter`
  84         top=`cat ../../set_ftrace_filter`
  85         if [ "$cur" = "$top" ]; then
  86             echo "This kernel is too old to support per instance filter"
  87             reset_ftrace_filter
  88             exit_unsupported
  89         fi
  90     fi
  91
  92     echo " make sure it works 5 times"
  93
  94     for i in `seq 5`; do
  95         sleep $SLEEP_TIME
  96         echo "  test $i"
  97         test_event_enabled $check_enable_star
  98
  99         echo $check_disable > $EVENT_ENABLE
 100     done
 101     sleep $SLEEP_TIME
 102     echo " make sure it's still works"
 103     test_event_enabled $check_enable_star
 104
 105     reset_ftrace_filter
 106
 107     echo " make sure it only works 3 times"
 108
 109     echo $check_disable > $EVENT_ENABLE
 110     sleep $SLEEP_TIME
 111
 112     echo "schedule:${enable}_event:$EVENT:3" > set_ftrace_filter
 113
 114     for i in `seq 3`; do
 115         sleep $SLEEP_TIME
 116         echo "  test $i"
 117         test_event_enabled $check_enable_star
 118
 119         echo $check_disable > $EVENT_ENABLE
 120     done
 121
 122     sleep $SLEEP_TIME
 123     echo " make sure it stop working"
 124     test_event_enabled $check_disable_star
 125
 126     do_reset
 127 }
 128
 129 run_enable_disable enable Enable 0 "1*" "0*"
 130 run_enable_disable disable Disable 1 "0*" "1*"