1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0-only
3
4 usage() {
5 echo "Dump boot-time tracing bootconfi
6 echo "Usage: $0 [--debug] [ > BOOTCONF
7 exit 1
8 }
9
10 DEBUG=
11 while [ x"$1" != x ]; do
12 case "$1" in
13 "--debug")
14 DEBUG=$1;;
15 -*)
16 usage
17 ;;
18 esac
19 shift 1
20 done
21
22 if [ x"$DEBUG" != x ]; then
23 set -x
24 fi
25
26 TRACEFS=`grep -m 1 -w tracefs /proc/mounts | c
27 if [ -z "$TRACEFS" ]; then
28 if ! grep -wq debugfs /proc/mounts; th
29 echo "Error: No tracefs/debugf
30 exit 1
31 fi
32 TRACEFS=`grep -m 1 -w debugfs /proc/mo
33 if [ ! -d $TRACEFS ]; then
34 echo "Error: ftrace is not ena
35 exit 1
36 fi
37 fi
38
39 ######## main #########
40
41 set -e
42
43 emit_kv() { # key =|+= value
44 echo "$@"
45 }
46
47 global_options() {
48 val=`cat $TRACEFS/max_graph_depth`
49 [ $val != 0 ] && emit_kv kernel.fgraph
50 if grep -qv "^#" $TRACEFS/set_graph_fu
51 cat 1>&2 << EOF
52 # WARN: kernel.fgraph_filters and kernel.fgrap
53 EOF
54 fi
55 }
56
57 kprobe_event_options() {
58 cat $TRACEFS/kprobe_events | while rea
59 case $p in
60 r*)
61 cat 1>&2 << EOF
62 # WARN: A return probe found but it is not sup
63 EOF
64 continue;;
65 esac
66 p=${p#*:}
67 event=${p#*/}
68 group=${p%/*}
69 if [ $group != "kprobes" ]; th
70 cat 1>&2 << EOF
71 # WARN: kprobes group name $group is changed t
72 EOF
73 fi
74 emit_kv $PREFIX.event.kprobes.
75 done
76 }
77
78 synth_event_options() {
79 cat $TRACEFS/synthetic_events | while
80 emit_kv $PREFIX.event.syntheti
81 done
82 }
83
84 # Variables resolver
85 DEFINED_VARS=
86 UNRESOLVED_EVENTS=
87
88 defined_vars() { # event-dir
89 grep "^hist" $1/trigger | grep -o ':[a
90 }
91 referred_vars() {
92 grep "^hist" $1/trigger | grep -o '$[a
93 }
94
95 event_is_enabled() { # enable-file
96 test -f $1 && grep -q "1" $1
97 }
98
99 per_event_options() { # event-dir
100 evdir=$1
101 # Check the special event which has no
102 [ ! -f $evdir/filter ] && return
103
104 if grep -q "^hist:" $evdir/trigger; th
105 # hist action can refer the un
106 __vars=`defined_vars $evdir`
107 for v in `referred_vars $evdir
108 if echo $DEFINED_VARS
109 # $v is not de
110 UNRESOLVED_EVE
111 return;
112 fi
113 done
114 DEFINED_VARS="$DEFINED_VARS "`
115 fi
116 grep -v "^#" $evdir/trigger | while re
117 emit_kv $PREFIX.event.$group.$
118 done
119
120 if [ $GROUP_ENABLED -eq 0 ] && event_i
121 emit_kv $PREFIX.event.$group.$
122 fi
123 val=`cat $evdir/filter`
124 if [ "$val" != "none" ]; then
125 emit_kv $PREFIX.event.$group.$
126 fi
127 }
128
129 retry_unresolved() {
130 unresolved=$UNRESOLVED_EVENTS
131 UNRESOLVED_EVENTS=
132 for evdir in $unresolved; do
133 event=${evdir##*/}
134 group=${evdir%/*}; group=${gro
135 per_event_options $evdir
136 done
137 }
138
139 event_options() {
140 # PREFIX and INSTANCE must be set
141 if [ $PREFIX = "ftrace" ]; then
142 # define the dynamic events
143 kprobe_event_options
144 synth_event_options
145 fi
146 ALL_ENABLED=0
147 if event_is_enabled $INSTANCE/events/e
148 emit_kv $PREFIX.event.enable
149 ALL_ENABLED=1
150 fi
151 for group in `ls $INSTANCE/events/` ;
152 [ ! -d $INSTANCE/events/$group
153 GROUP_ENABLED=$ALL_ENABLED
154 if [ $ALL_ENABLED -eq 0 ] && \
155 event_is_enabled $INSTANCE/
156 emit_kv $PREFIX.event.
157 GROUP_ENABLED=1
158 fi
159 for event in `ls $INSTANCE/eve
160 [ ! -d $INSTANCE/event
161 per_event_options $INS
162 done
163 done
164 retry=0
165 while [ $retry -lt 3 ]; do
166 retry_unresolved
167 retry=$((retry + 1))
168 done
169 if [ "$UNRESOLVED_EVENTS" ]; then
170 cat 1>&2 << EOF
171 ! ERROR: hist triggers in $UNRESOLVED_EVENTS u
172 EOF
173 fi
174 }
175
176 is_default_trace_option() { # option
177 grep -qw $1 << EOF
178 print-parent
179 nosym-offset
180 nosym-addr
181 noverbose
182 noraw
183 nohex
184 nobin
185 noblock
186 trace_printk
187 annotate
188 nouserstacktrace
189 nosym-userobj
190 noprintk-msg-only
191 context-info
192 nolatency-format
193 record-cmd
194 norecord-tgid
195 overwrite
196 nodisable_on_free
197 irq-info
198 markers
199 noevent-fork
200 nopause-on-trace
201 function-trace
202 nofunction-fork
203 nodisplay-graph
204 nostacktrace
205 notest_nop_accept
206 notest_nop_refuse
207 EOF
208 }
209
210 instance_options() { # [instance-name]
211 if [ $# -eq 0 ]; then
212 PREFIX="ftrace"
213 INSTANCE=$TRACEFS
214 else
215 PREFIX="ftrace.instance.$1"
216 INSTANCE=$TRACEFS/instances/$1
217 fi
218 val=
219 for i in `cat $INSTANCE/trace_options`
220 is_default_trace_option $i &&
221 val="$val, $i"
222 done
223 [ "$val" ] && emit_kv $PREFIX.options
224 val="local"
225 for i in `cat $INSTANCE/trace_clock` ;
226 [ "${i#*]}" ] && continue
227 i=${i%]}; val=${i#[}
228 done
229 [ $val != "local" ] && emit_kv $PREFIX
230 val=`cat $INSTANCE/buffer_size_kb`
231 if echo $val | grep -vq "expanded" ; t
232 emit_kv $PREFIX.buffer_size =
233 fi
234 if grep -q "is allocated" $INSTANCE/sn
235 emit_kv $PREFIX.alloc_snapshot
236 fi
237 val=`cat $INSTANCE/tracing_cpumask`
238 if [ `echo $val | sed -e s/f//g`x != x
239 emit_kv $PREFIX.cpumask = $val
240 fi
241 val=`cat $INSTANCE/tracing_on`
242 if [ "$val" = "0" ]; then
243 emit_kv $PREFIX.tracing_on = 0
244 fi
245
246 val=`cat $INSTANCE/current_tracer`
247 [ $val != nop ] && emit_kv $PREFIX.tra
248 if grep -qv "^#" $INSTANCE/set_ftrace_
249 cat 1>&2 << EOF
250 # WARN: kernel.ftrace.filters and kernel.ftrac
251 EOF
252 fi
253 event_options
254 }
255
256 global_options
257 instance_options
258 for i in `ls $TRACEFS/instances` ; do
259 instance_options $i
260 done
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