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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: ftrace - test reading of set_ftrace_filter
   4 #
   5 # The set_ftrace_filter file of ftrace is used to list functions as well as
   6 # triggers (probes) attached to functions. The code to read this file is not
   7 # straight forward and has had various bugs in the past. This test is designed
   8 # to add functions and triggers to that file in various ways and read that
   9 # file in various ways (cat vs dd).
  10 #
  11
  12 # The triggers are set within the set_ftrace_filter file
  13 check_filter_file set_ftrace_filter
  14
  15 fail() { # mesg
  16     echo $1
  17     exit_fail
  18 }
  19
  20 FILTER=set_ftrace_filter
  21 FUNC1="schedule"
  22 FUNC2="do_softirq"
  23
  24 ALL_FUNCS="#### all functions enabled ####"
  25
  26 test_func() {
  27     if ! echo "$1" | grep -q "^$2\$"; then
  28         return 0
  29     fi
  30     echo "$1" | grep -v "^$2\$"
  31     return 1
  32 }
  33
  34 check_set_ftrace_filter() {
  35     cat=`cat $FILTER`
  36     dd1=`dd if=$FILTER bs=1 | grep -v -e 'records in' -e 'records out' -e 'bytes copied'`
  37     dd100=`dd if=$FILTER bs=100 | grep -v -e 'records in' -e 'records out' -e 'bytes copied'`
  38
  39     echo "Testing '$@'"
  40
  41     while [ $# -gt 0 ]; do
  42         echo "test $1"
  43         if cat=`test_func "$cat" "$1"`; then
  44             return 0
  45         fi
  46         if dd1=`test_func "$dd1" "$1"`; then
  47             return 0
  48         fi
  49         if dd100=`test_func "$dd100" "$1"`; then
  50             return 0
  51         fi
  52         shift
  53     done
  54
  55     if [ -n "$cat" ]; then
  56         return 0
  57     fi
  58     if [ -n "$dd1" ]; then
  59         return 0
  60     fi
  61     if [ -n "$dd100" ]; then
  62         return 0
  63     fi
  64     return 1;
  65 }
  66
  67 if check_set_ftrace_filter "$ALL_FUNCS"; then
  68     fail "Expected only $ALL_FUNCS"
  69 fi
  70
  71 echo "$FUNC1:traceoff" > set_ftrace_filter
  72 if check_set_ftrace_filter "$ALL_FUNCS" "$FUNC1:traceoff:unlimited"; then
  73     fail "Expected $ALL_FUNCS and $FUNC1:traceoff:unlimited"
  74 fi
  75
  76 echo "$FUNC1" > set_ftrace_filter
  77 if check_set_ftrace_filter "$FUNC1" "$FUNC1:traceoff:unlimited"; then
  78     fail "Expected $FUNC1 and $FUNC1:traceoff:unlimited"
  79 fi
  80
  81 echo "$FUNC2" >> set_ftrace_filter
  82 if check_set_ftrace_filter "$FUNC1" "$FUNC2" "$FUNC1:traceoff:unlimited"; then
  83     fail "Expected $FUNC1 $FUNC2 and $FUNC1:traceoff:unlimited"
  84 fi
  85
  86 echo "$FUNC2:traceoff" >> set_ftrace_filter
  87 if check_set_ftrace_filter "$FUNC1" "$FUNC2" "$FUNC1:traceoff:unlimited" "$FUNC2:traceoff:unlimited"; then
  88     fail "Expected $FUNC1 $FUNC2 $FUNC1:traceoff:unlimited and $FUNC2:traceoff:unlimited"
  89 fi
  90
  91 echo "$FUNC1" > set_ftrace_filter
  92 if check_set_ftrace_filter "$FUNC1" "$FUNC1:traceoff:unlimited" "$FUNC2:traceoff:unlimited"; then
  93     fail "Expected $FUNC1 $FUNC1:traceoff:unlimited and $FUNC2:traceoff:unlimited"
  94 fi
  95
  96 echo > set_ftrace_filter
  97 if check_set_ftrace_filter "$ALL_FUNCS" "$FUNC1:traceoff:unlimited" "$FUNC2:traceoff:unlimited"; then
  98     fail "Expected $ALL_FUNCS $FUNC1:traceoff:unlimited and $FUNC2:traceoff:unlimited"
  99 fi
 100
 101 reset_ftrace_filter
 102
 103 if check_set_ftrace_filter "$ALL_FUNCS"; then
 104     fail "Expected $ALL_FUNCS"
 105 fi
 106
 107 echo "$FUNC1" > set_ftrace_filter
 108 if check_set_ftrace_filter "$FUNC1" ; then
 109     fail "Expected $FUNC1"
 110 fi
 111
 112 echo "$FUNC2" >> set_ftrace_filter
 113 if check_set_ftrace_filter "$FUNC1" "$FUNC2" ; then
 114     fail "Expected $FUNC1 and $FUNC2"
 115 fi
 116
 117 test_actual() { # Compares $TMPDIR/expected with set_ftrace_filter
 118     cat set_ftrace_filter | grep -v '#' | cut -d' ' -f1 | cut -d':' -f1 | sort -u > $TMPDIR/actual
 119     DIFF=`diff $TMPDIR/actual $TMPDIR/expected`
 120     test -z "$DIFF"
 121 }
 122
 123 # Set traceoff trigger for all fuctions with "lock" in their name
 124 cat available_filter_functions | cut -d' ' -f1 |  grep 'lock' | sort -u > $TMPDIR/expected
 125 echo '*lock*:traceoff' > set_ftrace_filter
 126 test_actual
 127
 128 # now remove all with 'try' in it, and end with lock
 129 grep -v 'try.*lock$' $TMPDIR/expected > $TMPDIR/expected2
 130 mv $TMPDIR/expected2 $TMPDIR/expected
 131 echo '!*try*lock:traceoff' >> set_ftrace_filter
 132 test_actual
 133
 134 # remove all that start with "m" and end with "lock"
 135 grep -v '^m.*lock$' $TMPDIR/expected > $TMPDIR/expected2
 136 mv $TMPDIR/expected2 $TMPDIR/expected
 137 echo '!m*lock:traceoff' >> set_ftrace_filter
 138 test_actual
 139
 140 # remove all that start with "c" and have "unlock"
 141 grep -v '^c.*unlock' $TMPDIR/expected > $TMPDIR/expected2
 142 mv $TMPDIR/expected2 $TMPDIR/expected
 143 echo '!c*unlock*:traceoff' >> set_ftrace_filter
 144 test_actual
 145
 146 # clear all the rest
 147 > $TMPDIR/expected
 148 echo '!*:traceoff' >> set_ftrace_filter
 149 test_actual
 150
 151 rm $TMPDIR/expected
 152 rm $TMPDIR/actual
 153
 154 exit 0