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