projects/linux·blob master · refs

262 lines · 5.8 KiB

1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0-only
3
4usage() {
5 echo "Dump boot-time tracing bootconfig from ftrace"
6 echo "Usage: $0 [--debug] [ > BOOTCONFIG-FILE]"
7 exit 1
8}
9
10DEBUG=
11while [ x"$1" != x ]; do
12 case "$1" in
13 "--debug")
14 DEBUG=$1;;
15 -*)
16 usage
17 ;;
18 esac
19 shift 1
20done
21
22if [ x"$DEBUG" != x ]; then
23 set -x
24fi
25
26TRACEFS=`grep -m 1 -w tracefs /proc/mounts | cut -f 2 -d " "`
27if [ -z "$TRACEFS" ]; then
28 if ! grep -wq debugfs /proc/mounts; then
29 echo "Error: No tracefs/debugfs was mounted."
30 exit 1
31 fi
32 TRACEFS=`grep -m 1 -w debugfs /proc/mounts | cut -f 2 -d " "`/tracing
33 if [ ! -d $TRACEFS ]; then
34 echo "Error: ftrace is not enabled on this kernel." 1>&2
35 exit 1
36 fi
37fi
38
39######## main #########
40
41set -e
42
43emit_kv() { # key =|+= value
44 echo "$@"
45}
46
47global_options() {
48 val=`cat $TRACEFS/max_graph_depth`
49 [ $val != 0 ] && emit_kv kernel.fgraph_max_depth = $val
50 if grep -qv "^#" $TRACEFS/set_graph_function $TRACEFS/set_graph_notrace ; then
51 cat 1>&2 << EOF
52# WARN: kernel.fgraph_filters and kernel.fgraph_notrace are not supported, since the wild card expression was expanded and lost from memory.
53EOF
54 fi
55}
56
57kprobe_event_options() {
58 cat $TRACEFS/kprobe_events | while read p args; do
59 case $p in
60 \#*)
61 continue;;
62 r*)
63 cat 1>&2 << EOF
64# WARN: A return probe found but it is not supported by bootconfig. Skip it.
65EOF
66 continue;;
67 esac
68 p=${p#*:}
69 event=${p#*/}
70 group=${p%/*}
71 if [ $group != "kprobes" ]; then
72 cat 1>&2 << EOF
73# WARN: kprobes group name $group is changed to "kprobes" for bootconfig.
74EOF
75 fi
76 emit_kv $PREFIX.event.kprobes.$event.probes += $args
77 done
78}
79
80synth_event_options() {
81 cat $TRACEFS/synthetic_events | while read event fields; do
82 emit_kv $PREFIX.event.synthetic.$event.fields = `echo $fields | sed "s/;/,/g"`
83 done
84}
85
86# Variables resolver
87DEFINED_VARS=
88UNRESOLVED_EVENTS=
89
90defined_vars() { # event-dir
91 grep "^hist" $1/trigger | grep -o ':[a-zA-Z0-9]*='
92}
93referred_vars() {
94 grep "^hist" $1/trigger | grep -o '$[a-zA-Z0-9]*'
95}
96
97event_is_enabled() { # enable-file
98 test -f $1 && grep -q "1" $1
99}
100
101per_event_options() { # event-dir
102 evdir=$1
103 # Check the special event which has no filter and no trigger
104 [ ! -f $evdir/filter ] && return
105
106 if grep -q "^hist:" $evdir/trigger; then
107 # hist action can refer the undefined variables
108 __vars=`defined_vars $evdir`
109 for v in `referred_vars $evdir`; do
110 if echo $DEFINED_VARS $__vars | grep -vqw ${v#$}; then
111 # $v is not defined yet, defer it
112 UNRESOLVED_EVENTS="$UNRESOLVED_EVENTS $evdir"
113 return;
114 fi
115 done
116 DEFINED_VARS="$DEFINED_VARS "`defined_vars $evdir`
117 fi
118 grep -v "^#" $evdir/trigger | while read action active; do
119 emit_kv $PREFIX.event.$group.$event.actions += \'$action\'
120 done
121
122 if [ $GROUP_ENABLED -eq 0 ] && event_is_enabled $evdir/enable; then
123 emit_kv $PREFIX.event.$group.$event.enable
124 fi
125 val=`cat $evdir/filter`
126 if [ "$val" != "none" ]; then
127 emit_kv $PREFIX.event.$group.$event.filter = "$val"
128 fi
129}
130
131retry_unresolved() {
132 unresolved=$UNRESOLVED_EVENTS
133 UNRESOLVED_EVENTS=
134 for evdir in $unresolved; do
135 event=${evdir##*/}
136 group=${evdir%/*}; group=${group##*/}
137 per_event_options $evdir
138 done
139}
140
141event_options() {
142 # PREFIX and INSTANCE must be set
143 if [ $PREFIX = "ftrace" ]; then
144 # define the dynamic events
145 kprobe_event_options
146 synth_event_options
147 fi
148 ALL_ENABLED=0
149 if event_is_enabled $INSTANCE/events/enable; then
150 emit_kv $PREFIX.event.enable
151 ALL_ENABLED=1
152 fi
153 for group in `ls $INSTANCE/events/` ; do
154 [ ! -d $INSTANCE/events/$group ] && continue
155 GROUP_ENABLED=$ALL_ENABLED
156 if [ $ALL_ENABLED -eq 0 ] && \
157 event_is_enabled $INSTANCE/events/$group/enable ;then
158 emit_kv $PREFIX.event.$group.enable
159 GROUP_ENABLED=1
160 fi
161 for event in `ls $INSTANCE/events/$group/` ;do
162 [ ! -d $INSTANCE/events/$group/$event ] && continue
163 per_event_options $INSTANCE/events/$group/$event
164 done
165 done
166 retry=0
167 while [ $retry -lt 3 ]; do
168 retry_unresolved
169 retry=$((retry + 1))
170 done
171 if [ "$UNRESOLVED_EVENTS" ]; then
172 cat 1>&2 << EOF
173! ERROR: hist triggers in $UNRESOLVED_EVENTS use some undefined variables.
174EOF
175 fi
176}
177
178is_default_trace_option() { # option
179grep -qw $1 << EOF
180print-parent
181nosym-offset
182nosym-addr
183noverbose
184noraw
185nohex
186nobin
187noblock
188trace_printk
189annotate
190nouserstacktrace
191nosym-userobj
192noprintk-msg-only
193context-info
194nolatency-format
195record-cmd
196norecord-tgid
197overwrite
198nodisable_on_free
199irq-info
200markers
201noevent-fork
202nopause-on-trace
203function-trace
204nofunction-fork
205nodisplay-graph
206nostacktrace
207notest_nop_accept
208notest_nop_refuse
209EOF
210}
211
212instance_options() { # [instance-name]
213 if [ $# -eq 0 ]; then
214 PREFIX="ftrace"
215 INSTANCE=$TRACEFS
216 else
217 PREFIX="ftrace.instance.$1"
218 INSTANCE=$TRACEFS/instances/$1
219 fi
220 val=
221 for i in `cat $INSTANCE/trace_options`; do
222 is_default_trace_option $i && continue
223 val="$val, $i"
224 done
225 [ "$val" ] && emit_kv $PREFIX.options = "${val#,}"
226 val="local"
227 for i in `cat $INSTANCE/trace_clock` ; do
228 [ "${i#*]}" ] && continue
229 i=${i%]}; val=${i#[}
230 done
231 [ $val != "local" ] && emit_kv $PREFIX.trace_clock = $val
232 val=`cat $INSTANCE/buffer_size_kb`
233 if echo $val | grep -vq "expanded" ; then
234 emit_kv $PREFIX.buffer_size = $val"KB"
235 fi
236 if grep -q "is allocated" $INSTANCE/snapshot ; then
237 emit_kv $PREFIX.alloc_snapshot
238 fi
239 val=`cat $INSTANCE/tracing_cpumask`
240 if [ `echo $val | sed -e s/f//g`x != x ]; then
241 emit_kv $PREFIX.cpumask = $val
242 fi
243 val=`cat $INSTANCE/tracing_on`
244 if [ "$val" = "0" ]; then
245 emit_kv $PREFIX.tracing_on = 0
246 fi
247
248 val=`cat $INSTANCE/current_tracer`
249 [ $val != nop ] && emit_kv $PREFIX.tracer = $val
250 if grep -qv "^#" $INSTANCE/set_ftrace_filter $INSTANCE/set_ftrace_notrace; then
251 cat 1>&2 << EOF
252# WARN: kernel.ftrace.filters and kernel.ftrace.notrace are not supported, since the wild card expression was expanded and lost from memory.
253EOF
254 fi
255 event_options
256}
257
258global_options
259instance_options
260for i in `ls $TRACEFS/instances` ; do
261 instance_options $i
262done