2 # SPDX-License-Identifier: GPL-2.0-only
5 echo "Dump boot-time tracing bootconfig from ftrace"
6 echo "Usage: $0 [--debug] [ > BOOTCONFIG-FILE]"
11 while [ x"$1" != x ]; do
22 if [ x"$DEBUG" != x ]; then
26 TRACEFS=`grep -m 1 -w tracefs /proc/mounts | cut -f 2 -d " "`
27 if [ -z "$TRACEFS" ]; then
28 if ! grep -wq debugfs /proc/mounts; then
29 echo "Error: No tracefs/debugfs was mounted."
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
39 ######## main #########
43 emit_kv() { # key =|+= value
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
52 # WARN: kernel.fgraph_filters and kernel.fgraph_notrace are not supported, since the wild card expression was expanded and lost from memory.
57 kprobe_event_options() {
58 cat $TRACEFS/kprobe_events | while read p args; do
62 # WARN: A return probe found but it is not supported by bootconfig. Skip it.
69 if [ $group != "kprobes" ]; then
71 # WARN: kprobes group name $group is changed to "kprobes" for bootconfig.
74 emit_kv $PREFIX.event.kprobes.$event.probes += $args
78 synth_event_options() {
79 cat $TRACEFS/synthetic_events | while read event fields; do
80 emit_kv $PREFIX.event.synthetic.$event.fields = `echo $fields | sed "s/;/,/g"`
88 defined_vars() { # event-dir
89 grep "^hist" $1/trigger | grep -o ':[a-zA-Z0-9]*='
92 grep "^hist" $1/trigger | grep -o '$[a-zA-Z0-9]*'
95 per_event_options() { # event-dir
97 # Check the special event which has no filter and no trigger
98 [ ! -f $evdir/filter ] && return
100 if grep -q "^hist:" $evdir/trigger; then
101 # hist action can refer the undefined variables
102 __vars=`defined_vars $evdir`
103 for v in `referred_vars $evdir`; do
104 if echo $DEFINED_VARS $__vars | grep -vqw ${v#$}; then
105 # $v is not defined yet, defer it
106 UNRESOLVED_EVENTS="$UNRESOLVED_EVENTS $evdir"
110 DEFINED_VARS="$DEFINED_VARS "`defined_vars $evdir`
112 grep -v "^#" $evdir/trigger | while read action active; do
113 emit_kv $PREFIX.event.$group.$event.actions += \'$action\'
116 # enable is not checked; this is done by set_event in the instance.
117 val=`cat $evdir/filter`
118 if [ "$val" != "none" ]; then
119 emit_kv $PREFIX.event.$group.$event.filter = "$val"
124 unresolved=$UNRESOLVED_EVENTS
126 for evdir in $unresolved; do
128 group=${evdir%/*}; group=${group##*/}
129 per_event_options $evdir
134 # PREFIX and INSTANCE must be set
135 if [ $PREFIX = "ftrace" ]; then
136 # define the dynamic events
140 for group in `ls $INSTANCE/events/` ; do
141 [ ! -d $INSTANCE/events/$group ] && continue
142 for event in `ls $INSTANCE/events/$group/` ;do
143 [ ! -d $INSTANCE/events/$group/$event ] && continue
144 per_event_options $INSTANCE/events/$group/$event
148 while [ $retry -lt 3 ]; do
152 if [ "$UNRESOLVED_EVENTS" ]; then
154 ! ERROR: hist triggers in $UNRESOLVED_EVENTS use some undefined variables.
159 is_default_trace_option() { # option
193 instance_options() { # [instance-name]
194 if [ $# -eq 0 ]; then
198 PREFIX="ftrace.instance.$1"
199 INSTANCE=$TRACEFS/instances/$1
202 for i in `cat $INSTANCE/trace_options`; do
203 is_default_trace_option $i && continue
206 [ "$val" ] && emit_kv $PREFIX.options = "${val#,}"
208 for i in `cat $INSTANCE/trace_clock` ; do
209 [ "${i#*]}" ] && continue
212 [ $val != "local" ] && emit_kv $PREFIX.trace_clock = $val
213 val=`cat $INSTANCE/buffer_size_kb`
214 if echo $val | grep -vq "expanded" ; then
215 emit_kv $PREFIX.buffer_size = $val"KB"
217 if grep -q "is allocated" $INSTANCE/snapshot ; then
218 emit_kv $PREFIX.alloc_snapshot
220 val=`cat $INSTANCE/tracing_cpumask`
221 if [ `echo $val | sed -e s/f//g`x != x ]; then
222 emit_kv $PREFIX.cpumask = $val
224 val=`cat $INSTANCE/tracing_on`
225 if [ `echo $val | sed -e s/f//g`x != x ]; then
226 emit_kv $PREFIX.tracing_on = $val
230 for i in `cat $INSTANCE/set_event`; do
233 [ "$val" ] && emit_kv $PREFIX.events = "${val#,}"
234 val=`cat $INSTANCE/current_tracer`
235 [ $val != nop ] && emit_kv $PREFIX.tracer = $val
236 if grep -qv "^#" $INSTANCE/set_ftrace_filter $INSTANCE/set_ftrace_notrace; then
238 # WARN: kernel.ftrace.filters and kernel.ftrace.notrace are not supported, since the wild card expression was expanded and lost from memory.
246 for i in `ls $TRACEFS/instances` ; do