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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: ftrace - test for function traceon/off 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 enabling and disabling tracing 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 fail() { # mesg
  20     echo $1
  21     exit_fail
  22 }
  23
  24 SLEEP_TIME=".1"
  25
  26 echo "Testing function probes with enabling disabling tracing:"
  27
  28 cnt_trace() {
  29     grep -v '^#' trace | wc -l
  30 }
  31
  32 echo '** DISABLE TRACING'
  33 disable_tracing
  34 clear_trace
  35
  36 cnt=`cnt_trace`
  37 if [ $cnt -ne 0 ]; then
  38     fail "Found junk in trace"
  39 fi
  40
  41
  42 echo '** ENABLE EVENTS'
  43
  44 echo 1 > events/sched/enable
  45
  46 echo '** ENABLE TRACING'
  47 enable_tracing
  48
  49 cnt=`cnt_trace`
  50 if [ $cnt -eq 0 ]; then
  51    fail "Nothing found in trace"
  52 fi
  53
  54 # powerpc uses .schedule
  55 func="schedule"
  56 available_file=available_filter_functions
  57 if [ -d ../../instances -a -f ../../available_filter_functions ]; then
  58    available_file=../../available_filter_functions
  59 fi
  60 x=`grep '^\.schedule$' available_filter_functions | wc -l`
  61 if [ "$x" -eq 1 ]; then
  62    func=".schedule"
  63 fi
  64
  65 echo '** SET TRACEOFF'
  66
  67 echo "$func:traceoff" > 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 cnt=`grep schedule set_ftrace_filter | wc -l`
  79 if [ $cnt -ne 1 ]; then
  80    fail "Did not find traceoff trigger"
  81 fi
  82
  83 cnt=`cnt_trace`
  84 sleep $SLEEP_TIME
  85 cnt2=`cnt_trace`
  86
  87 if [ $cnt -ne $cnt2 ]; then
  88    fail "Tracing is not stopped"
  89 fi
  90
  91 on=`cat tracing_on`
  92 if [ $on != "0" ]; then
  93     fail "Tracing is not off"
  94 fi
  95
  96 csum1=`md5sum trace`
  97 sleep $SLEEP_TIME
  98 csum2=`md5sum trace`
  99
 100 if [ "$csum1" != "$csum2" ]; then
 101     fail "Tracing file is still changing"
 102 fi
 103
 104 clear_trace
 105
 106 cnt=`cnt_trace`
 107 if [ $cnt -ne 0 ]; then
 108     fail "Tracing is still happeing"
 109 fi
 110
 111 echo "!$func:traceoff" >> set_ftrace_filter
 112
 113 cnt=`grep schedule set_ftrace_filter | wc -l`
 114 if [ $cnt -ne 0 ]; then
 115     fail "traceoff trigger still exists"
 116 fi
 117
 118 on=`cat tracing_on`
 119 if [ $on != "0" ]; then
 120     fail "Tracing is started again"
 121 fi
 122
 123 echo "$func:traceon" > set_ftrace_filter
 124
 125 cnt=`grep schedule set_ftrace_filter | wc -l`
 126 if [ $cnt -ne 1 ]; then
 127     fail "traceon trigger not found"
 128 fi
 129
 130 cnt=`cnt_trace`
 131 if [ $cnt -eq 0 ]; then
 132    fail "Tracing did not start"
 133 fi
 134
 135 on=`cat tracing_on`
 136 if [ $on != "1" ]; then
 137     fail "Tracing was not enabled"
 138 fi
 139
 140
 141 echo "!$func:traceon" >> set_ftrace_filter
 142
 143 cnt=`grep schedule set_ftrace_filter | wc -l`
 144 if [ $cnt -ne 0 ]; then
 145    fail "traceon trigger still exists"
 146 fi
 147
 148 check_sleep() {
 149     val=$1
 150     sleep $SLEEP_TIME
 151     cat set_ftrace_filter
 152     on=`cat tracing_on`
 153     if [ $on != "$val" ]; then
 154         fail "Expected tracing_on to be $val, but it was $on"
 155     fi
 156 }
 157
 158
 159 echo "$func:traceoff:3" > set_ftrace_filter
 160 check_sleep "0"
 161 echo 1 > tracing_on
 162 check_sleep "0"
 163 echo 1 > tracing_on
 164 check_sleep "0"
 165 echo 1 > tracing_on
 166 check_sleep "1"
 167 echo "!$func:traceoff:0" > set_ftrace_filter
 168
 169 if grep -e traceon -e traceoff set_ftrace_filter; then
 170     fail "Tracing on and off triggers still exist"
 171 fi
 172
 173 disable_events
 174
 175 exit 0