tools/bootconfig/scripts/ftrace.sh

   1 # SPDX-License-Identifier: GPL-2.0-only
   2
   3 clear_trace() { # reset trace output
   4     echo > trace
   5 }
   6
   7 disable_tracing() { # stop trace recording
   8     echo 0 > tracing_on
   9 }
  10
  11 enable_tracing() { # start trace recording
  12     echo 1 > tracing_on
  13 }
  14
  15 reset_tracer() { # reset the current tracer
  16     echo nop > current_tracer
  17 }
  18
  19 reset_trigger_file() {
  20     # remove action triggers first
  21     grep -H ':on[^:]*(' $@ |
  22     while read line; do
  23         cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
  24         file=`echo $line | cut -f1 -d:`
  25         echo "!$cmd" >> $file
  26     done
  27     grep -Hv ^# $@ |
  28     while read line; do
  29         cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
  30         file=`echo $line | cut -f1 -d:`
  31         echo "!$cmd" > $file
  32     done
  33 }
  34
  35 reset_trigger() { # reset all current setting triggers
  36     if [ -d events/synthetic ]; then
  37         reset_trigger_file events/synthetic/*/trigger
  38     fi
  39     reset_trigger_file events/*/*/trigger
  40 }
  41
  42 reset_events_filter() { # reset all current setting filters
  43     grep -v ^none events/*/*/filter |
  44     while read line; do
  45         echo 0 > `echo $line | cut -f1 -d:`
  46     done
  47 }
  48
  49 reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
  50     if [ ! -f set_ftrace_filter ]; then
  51       return 0
  52     fi
  53     echo > set_ftrace_filter
  54     grep -v '^#' set_ftrace_filter | while read t; do
  55         tr=`echo $t | cut -d: -f2`
  56         if [ "$tr" = "" ]; then
  57             continue
  58         fi
  59         if ! grep -q "$t" set_ftrace_filter; then
  60                 continue;
  61         fi
  62         name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
  63         if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
  64             tr=`echo $t | cut -d: -f2-4`
  65             limit=`echo $t | cut -d: -f5`
  66         else
  67             tr=`echo $t | cut -d: -f2`
  68             limit=`echo $t | cut -d: -f3`
  69         fi
  70         if [ "$limit" != "unlimited" ]; then
  71             tr="$tr:$limit"
  72         fi
  73         echo "!$name:$tr" > set_ftrace_filter
  74     done
  75 }
  76
  77 disable_events() {
  78     echo 0 > events/enable
  79 }
  80
  81 clear_synthetic_events() { # reset all current synthetic events
  82     grep -v ^# synthetic_events |
  83     while read line; do
  84         echo "!$line" >> synthetic_events
  85     done
  86 }
  87
  88 initialize_ftrace() { # Reset ftrace to initial-state
  89 # As the initial state, ftrace will be set to nop tracer,
  90 # no events, no triggers, no filters, no function filters,
  91 # no probes, and tracing on.
  92     disable_tracing
  93     reset_tracer
  94     reset_trigger
  95     reset_events_filter
  96     reset_ftrace_filter
  97     disable_events
  98     [ -f set_event_pid ] && echo > set_event_pid
  99     [ -f set_ftrace_pid ] && echo > set_ftrace_pid
 100     [ -f set_ftrace_notrace ] && echo > set_ftrace_notrace
 101     [ -f set_graph_function ] && echo | tee set_graph_*
 102     [ -f stack_trace_filter ] && echo > stack_trace_filter
 103     [ -f kprobe_events ] && echo > kprobe_events
 104     [ -f uprobe_events ] && echo > uprobe_events
 105     [ -f synthetic_events ] && echo > synthetic_events
 106     [ -f snapshot ] && echo 0 > snapshot
 107     clear_trace
 108     enable_tracing
 109 }