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|
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
usage() {
echo "Dump boot-time tracing bootconfig from ftrace"
echo "Usage: $0 [--debug] [ > BOOTCONFIG-FILE]"
exit 1
}
DEBUG=
while [ x"$1" != x ]; do
case "$1" in
"--debug")
DEBUG=$1;;
-*)
usage
;;
esac
shift 1
done
if [ x"$DEBUG" != x ]; then
set -x
fi
TRACEFS=`grep -m 1 -w tracefs /proc/mounts | cut -f 2 -d " "`
if [ -z "$TRACEFS" ]; then
if ! grep -wq debugfs /proc/mounts; then
echo "Error: No tracefs/debugfs was mounted."
exit 1
fi
TRACEFS=`grep -m 1 -w debugfs /proc/mounts | cut -f 2 -d " "`/tracing
if [ ! -d $TRACEFS ]; then
echo "Error: ftrace is not enabled on this kernel." 1>&2
exit 1
fi
fi
######## main #########
set -e
emit_kv() { # key =|+= value
echo "$@"
}
global_options() {
val=`cat $TRACEFS/max_graph_depth`
[ $val != 0 ] && emit_kv kernel.fgraph_max_depth = $val
if grep -qv "^#" $TRACEFS/set_graph_function $TRACEFS/set_graph_notrace ; then
cat 1>&2 << EOF
# WARN: kernel.fgraph_filters and kernel.fgraph_notrace are not supported, since the wild card expression was expanded and lost from memory.
EOF
fi
}
kprobe_event_options() {
cat $TRACEFS/kprobe_events | while read p args; do
case $p in
r*)
cat 1>&2 << EOF
# WARN: A return probe found but it is not supported by bootconfig. Skip it.
EOF
continue;;
esac
p=${p#*:}
event=${p#*/}
group=${p%/*}
if [ $group != "kprobes" ]; then
cat 1>&2 << EOF
# WARN: kprobes group name $group is changed to "kprobes" for bootconfig.
EOF
fi
emit_kv $PREFIX.event.kprobes.$event.probes += $args
done
}
synth_event_options() {
cat $TRACEFS/synthetic_events | while read event fields; do
emit_kv $PREFIX.event.synthetic.$event.fields = `echo $fields | sed "s/;/,/g"`
done
}
# Variables resolver
DEFINED_VARS=
UNRESOLVED_EVENTS=
defined_vars() { # event-dir
grep "^hist" $1/trigger | grep -o ':[a-zA-Z0-9]*='
}
referred_vars() {
grep "^hist" $1/trigger | grep -o '$[a-zA-Z0-9]*'
}
per_event_options() { # event-dir
evdir=$1
# Check the special event which has no filter and no trigger
[ ! -f $evdir/filter ] && return
if grep -q "^hist:" $evdir/trigger; then
# hist action can refer the undefined variables
__vars=`defined_vars $evdir`
for v in `referred_vars $evdir`; do
if echo $DEFINED_VARS $__vars | grep -vqw ${v#$}; then
# $v is not defined yet, defer it
UNRESOLVED_EVENTS="$UNRESOLVED_EVENTS $evdir"
return;
fi
done
DEFINED_VARS="$DEFINED_VARS "`defined_vars $evdir`
fi
grep -v "^#" $evdir/trigger | while read action active; do
emit_kv $PREFIX.event.$group.$event.actions += \'$action\'
done
# enable is not checked; this is done by set_event in the instance.
val=`cat $evdir/filter`
if [ "$val" != "none" ]; then
emit_kv $PREFIX.event.$group.$event.filter = "$val"
fi
}
retry_unresolved() {
unresolved=$UNRESOLVED_EVENTS
UNRESOLVED_EVENTS=
for evdir in $unresolved; do
event=${evdir##*/}
group=${evdir%/*}; group=${group##*/}
per_event_options $evdir
done
}
event_options() {
# PREFIX and INSTANCE must be set
if [ $PREFIX = "ftrace" ]; then
# define the dynamic events
kprobe_event_options
synth_event_options
fi
for group in `ls $INSTANCE/events/` ; do
[ ! -d $INSTANCE/events/$group ] && continue
for event in `ls $INSTANCE/events/$group/` ;do
[ ! -d $INSTANCE/events/$group/$event ] && continue
per_event_options $INSTANCE/events/$group/$event
done
done
retry=0
while [ $retry -lt 3 ]; do
retry_unresolved
retry=$((retry + 1))
done
if [ "$UNRESOLVED_EVENTS" ]; then
cat 1>&2 << EOF
! ERROR: hist triggers in $UNRESOLVED_EVENTS use some undefined variables.
EOF
fi
}
is_default_trace_option() { # option
grep -qw $1 << EOF
print-parent
nosym-offset
nosym-addr
noverbose
noraw
nohex
nobin
noblock
trace_printk
annotate
nouserstacktrace
nosym-userobj
noprintk-msg-only
context-info
nolatency-format
record-cmd
norecord-tgid
overwrite
nodisable_on_free
irq-info
markers
noevent-fork
nopause-on-trace
function-trace
nofunction-fork
nodisplay-graph
nostacktrace
notest_nop_accept
notest_nop_refuse
EOF
}
instance_options() { # [instance-name]
if [ $# -eq 0 ]; then
PREFIX="ftrace"
INSTANCE=$TRACEFS
else
PREFIX="ftrace.instance.$1"
INSTANCE=$TRACEFS/instances/$1
fi
val=
for i in `cat $INSTANCE/trace_options`; do
is_default_trace_option $i && continue
val="$val, $i"
done
[ "$val" ] && emit_kv $PREFIX.options = "${val#,}"
val="local"
for i in `cat $INSTANCE/trace_clock` ; do
[ "${i#*]}" ] && continue
i=${i%]}; val=${i#[}
done
[ $val != "local" ] && emit_kv $PREFIX.trace_clock = $val
val=`cat $INSTANCE/buffer_size_kb`
if echo $val | grep -vq "expanded" ; then
emit_kv $PREFIX.buffer_size = $val"KB"
fi
if grep -q "is allocated" $INSTANCE/snapshot ; then
emit_kv $PREFIX.alloc_snapshot
fi
val=`cat $INSTANCE/tracing_cpumask`
if [ `echo $val | sed -e s/f//g`x != x ]; then
emit_kv $PREFIX.cpumask = $val
fi
val=
for i in `cat $INSTANCE/set_event`; do
val="$val, $i"
done
[ "$val" ] && emit_kv $PREFIX.events = "${val#,}"
val=`cat $INSTANCE/current_tracer`
[ $val != nop ] && emit_kv $PREFIX.tracer = $val
if grep -qv "^#" $INSTANCE/set_ftrace_filter $INSTANCE/set_ftrace_notrace; then
cat 1>&2 << EOF
# WARN: kernel.ftrace.filters and kernel.ftrace.notrace are not supported, since the wild card expression was expanded and lost from memory.
EOF
fi
event_options
}
global_options
instance_options
for i in `ls $TRACEFS/instances` ; do
instance_options $i
done
|
