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 }
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