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 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 enabling disabling tracing:"
  38
  39 cnt_trace() {
  40     grep -v '^#' trace | wc -l
  41 }
  42
  43 echo '** DISABLE TRACING'
  44 disable_tracing
  45 clear_trace
  46
  47 cnt=`cnt_trace`
  48 if [ $cnt -ne 0 ]; then
  49     fail "Found junk in trace"
  50 fi
  51
  52
  53 echo '** ENABLE EVENTS'
  54
  55 echo 1 > events/enable
  56
  57 echo '** ENABLE TRACING'
  58 enable_tracing
  59
  60 cnt=`cnt_trace`
  61 if [ $cnt -eq 0 ]; then
  62    fail "Nothing found in trace"
  63 fi
  64
  65 # powerpc uses .schedule
  66 func="schedule"
  67 available_file=available_filter_functions
  68 if [ -d ../../instances -a -f ../../available_filter_functions ]; then
  69    available_file=../../available_filter_functions
  70 fi
  71 x=`grep '^\.schedule$' available_filter_functions | wc -l`
  72 if [ "$x" -eq 1 ]; then
  73    func=".schedule"
  74 fi
  75
  76 echo '** SET TRACEOFF'
  77
  78 echo "$func:traceoff" > set_ftrace_filter
  79 if [ -d ../../instances ]; then # Check instances
  80     cur=`cat set_ftrace_filter`
  81     top=`cat ../../set_ftrace_filter`
  82     if [ "$cur" = "$top" ]; then
  83         echo "This kernel is too old to support per instance filter"
  84         reset_ftrace_filter
  85         exit_unsupported
  86     fi
  87 fi
  88
  89 cnt=`grep schedule set_ftrace_filter | wc -l`
  90 if [ $cnt -ne 1 ]; then
  91    fail "Did not find traceoff trigger"
  92 fi
  93
  94 cnt=`cnt_trace`
  95 sleep $SLEEP_TIME
  96 cnt2=`cnt_trace`
  97
  98 if [ $cnt -ne $cnt2 ]; then
  99    fail "Tracing is not stopped"
 100 fi
 101
 102 on=`cat tracing_on`
 103 if [ $on != "0" ]; then
 104     fail "Tracing is not off"
 105 fi
 106
 107 csum1=`md5sum trace`
 108 sleep $SLEEP_TIME
 109 csum2=`md5sum trace`
 110
 111 if [ "$csum1" != "$csum2" ]; then
 112     fail "Tracing file is still changing"
 113 fi
 114
 115 clear_trace
 116
 117 cnt=`cnt_trace`
 118 if [ $cnt -ne 0 ]; then
 119     fail "Tracing is still happeing"
 120 fi
 121
 122 echo "!$func:traceoff" >> set_ftrace_filter
 123
 124 cnt=`grep schedule set_ftrace_filter | wc -l`
 125 if [ $cnt -ne 0 ]; then
 126     fail "traceoff trigger still exists"
 127 fi
 128
 129 on=`cat tracing_on`
 130 if [ $on != "0" ]; then
 131     fail "Tracing is started again"
 132 fi
 133
 134 echo "$func:traceon" > set_ftrace_filter
 135
 136 cnt=`grep schedule set_ftrace_filter | wc -l`
 137 if [ $cnt -ne 1 ]; then
 138     fail "traceon trigger not found"
 139 fi
 140
 141 cnt=`cnt_trace`
 142 if [ $cnt -eq 0 ]; then
 143    fail "Tracing did not start"
 144 fi
 145
 146 on=`cat tracing_on`
 147 if [ $on != "1" ]; then
 148     fail "Tracing was not enabled"
 149 fi
 150
 151
 152 echo "!$func:traceon" >> set_ftrace_filter
 153
 154 cnt=`grep schedule set_ftrace_filter | wc -l`
 155 if [ $cnt -ne 0 ]; then
 156    fail "traceon trigger still exists"
 157 fi
 158
 159 check_sleep() {
 160     val=$1
 161     sleep $SLEEP_TIME
 162     cat set_ftrace_filter
 163     on=`cat tracing_on`
 164     if [ $on != "$val" ]; then
 165         fail "Expected tracing_on to be $val, but it was $on"
 166     fi
 167 }
 168
 169
 170 echo "$func:traceoff:3" > set_ftrace_filter
 171 check_sleep "0"
 172 echo 1 > tracing_on
 173 check_sleep "0"
 174 echo 1 > tracing_on
 175 check_sleep "0"
 176 echo 1 > tracing_on
 177 check_sleep "1"
 178 echo "!$func:traceoff:0" > set_ftrace_filter
 179
 180 if grep -e traceon -e traceoff set_ftrace_filter; then
 181     fail "Tracing on and off triggers still exist"
 182 fi
 183
 184 disable_events
 185
 186 exit 0