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 check_filter_file set_ftrace_filter
  15
  16 fail() { # mesg
  17     echo $1
  18     exit_fail
  19 }
  20
  21 SLEEP_TIME=".1"
  22
  23 echo "Testing function probes with enabling disabling tracing:"
  24
  25 cnt_trace() {
  26     grep -v '^#' trace | wc -l
  27 }
  28
  29 echo '** DISABLE TRACING'
  30 disable_tracing
  31 clear_trace
  32
  33 cnt=`cnt_trace`
  34 if [ $cnt -ne 0 ]; then
  35     fail "Found junk in trace"
  36 fi
  37
  38
  39 echo '** ENABLE EVENTS'
  40
  41 echo 1 > events/sched/enable
  42
  43 echo '** ENABLE TRACING'
  44 enable_tracing
  45
  46 cnt=`cnt_trace`
  47 if [ $cnt -eq 0 ]; then
  48    fail "Nothing found in trace"
  49 fi
  50
  51 # powerpc uses .schedule
  52 func="schedule"
  53 available_file=available_filter_functions
  54 if [ -d ../../instances -a -f ../../available_filter_functions ]; then
  55    available_file=../../available_filter_functions
  56 fi
  57 x=`grep '^\.schedule$' available_filter_functions | wc -l`
  58 if [ "$x" -eq 1 ]; then
  59    func=".schedule"
  60 fi
  61
  62 echo '** SET TRACEOFF'
  63
  64 echo "$func:traceoff" > set_ftrace_filter
  65 if [ -d ../../instances ]; then # Check instances
  66     cur=`cat set_ftrace_filter`
  67     top=`cat ../../set_ftrace_filter`
  68     if [ "$cur" = "$top" ]; then
  69         echo "This kernel is too old to support per instance filter"
  70         reset_ftrace_filter
  71         exit_unsupported
  72     fi
  73 fi
  74
  75 cnt=`grep schedule set_ftrace_filter | wc -l`
  76 if [ $cnt -ne 1 ]; then
  77    fail "Did not find traceoff trigger"
  78 fi
  79
  80 cnt=`cnt_trace`
  81 sleep $SLEEP_TIME
  82 cnt2=`cnt_trace`
  83
  84 if [ $cnt -ne $cnt2 ]; then
  85    fail "Tracing is not stopped"
  86 fi
  87
  88 on=`cat tracing_on`
  89 if [ $on != "0" ]; then
  90     fail "Tracing is not off"
  91 fi
  92
  93 csum1=`md5sum trace`
  94 sleep $SLEEP_TIME
  95 csum2=`md5sum trace`
  96
  97 if [ "$csum1" != "$csum2" ]; then
  98     fail "Tracing file is still changing"
  99 fi
 100
 101 clear_trace
 102
 103 cnt=`cnt_trace`
 104 if [ $cnt -ne 0 ]; then
 105     fail "Tracing is still happeing"
 106 fi
 107
 108 echo "!$func:traceoff" >> set_ftrace_filter
 109
 110 cnt=`grep schedule set_ftrace_filter | wc -l`
 111 if [ $cnt -ne 0 ]; then
 112     fail "traceoff trigger still exists"
 113 fi
 114
 115 on=`cat tracing_on`
 116 if [ $on != "0" ]; then
 117     fail "Tracing is started again"
 118 fi
 119
 120 echo "$func:traceon" > set_ftrace_filter
 121
 122 cnt=`grep schedule set_ftrace_filter | wc -l`
 123 if [ $cnt -ne 1 ]; then
 124     fail "traceon trigger not found"
 125 fi
 126
 127 cnt=`cnt_trace`
 128 if [ $cnt -eq 0 ]; then
 129    fail "Tracing did not start"
 130 fi
 131
 132 on=`cat tracing_on`
 133 if [ $on != "1" ]; then
 134     fail "Tracing was not enabled"
 135 fi
 136
 137
 138 echo "!$func:traceon" >> set_ftrace_filter
 139
 140 cnt=`grep schedule set_ftrace_filter | wc -l`
 141 if [ $cnt -ne 0 ]; then
 142    fail "traceon trigger still exists"
 143 fi
 144
 145 check_sleep() {
 146     val=$1
 147     sleep $SLEEP_TIME
 148     cat set_ftrace_filter
 149     on=`cat tracing_on`
 150     if [ $on != "$val" ]; then
 151         fail "Expected tracing_on to be $val, but it was $on"
 152     fi
 153 }
 154
 155
 156 echo "$func:traceoff:3" > set_ftrace_filter
 157 check_sleep "0"
 158 echo 1 > tracing_on
 159 check_sleep "0"
 160 echo 1 > tracing_on
 161 check_sleep "0"
 162 echo 1 > tracing_on
 163 check_sleep "1"
 164 echo "!$func:traceoff:0" > set_ftrace_filter
 165
 166 if grep -e traceon -e traceoff set_ftrace_filter; then
 167     fail "Tracing on and off triggers still exist"
 168 fi
 169
 170 disable_events
 171
 172 exit 0