tools/testing/selftests/ftrace/test.d/00basic/trace_marker.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Basic tests on writing to trace_marker
   4 # requires: trace_marker
   5 # flags: instance
   6
   7 get_buffer_data_size() {
   8         sed -ne 's/^.*data.*size:\([0-9][0-9]*\).*/\1/p' events/header_page
   9 }
  10
  11 get_buffer_data_offset() {
  12         sed -ne 's/^.*data.*offset:\([0-9][0-9]*\).*/\1/p' events/header_page
  13 }
  14
  15 get_event_header_size() {
  16         type_len=`sed -ne 's/^.*type_len.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event`
  17         time_len=`sed -ne 's/^.*time_delta.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event`
  18         array_len=`sed -ne 's/^.*array.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event`
  19         total_bits=$((type_len+time_len+array_len))
  20         total_bits=$((total_bits+7))
  21         echo $((total_bits/8))
  22 }
  23
  24 get_print_event_buf_offset() {
  25         sed -ne 's/^.*buf.*offset:\([0-9][0-9]*\).*/\1/p' events/ftrace/print/format
  26 }
  27
  28 event_header_size=`get_event_header_size`
  29 print_header_size=`get_print_event_buf_offset`
  30
  31 data_offset=`get_buffer_data_offset`
  32
  33 marker_meta=$((event_header_size+print_header_size))
  34
  35 make_str() {
  36         cnt=$1
  37         # subtract two for \n\0 as marker adds these
  38         cnt=$((cnt-2))
  39         printf -- 'X%.0s' $(seq $cnt)
  40 }
  41
  42 write_buffer() {
  43         size=$1
  44
  45         str=`make_str $size`
  46
  47         # clear the buffer
  48         echo > trace
  49
  50         # write the string into the marker
  51         echo -n $str > trace_marker
  52
  53         echo $str
  54 }
  55
  56 test_buffer() {
  57
  58         size=`get_buffer_data_size`
  59         oneline_size=$((size-marker_meta))
  60         echo size = $size
  61         echo meta size = $marker_meta
  62
  63         # Now add a little more the meta data overhead will overflow
  64
  65         str=`write_buffer $size`
  66
  67         # Make sure the line was broken
  68         new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; exit}' trace`
  69
  70         if [ "$new_str" = "$str" ]; then
  71                 exit fail;
  72         fi
  73
  74         # Make sure the entire line can be found
  75         new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; }' trace`
  76
  77         if [ "$new_str" != "$str" ]; then
  78                 exit fail;
  79         fi
  80 }
  81
  82 test_buffer