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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
usage() {
echo "Ftrace boottime trace test tool"
echo "Usage: $0 [--apply|--init] [--debug] BOOTCONFIG-FILE"
echo " --apply: Test actual apply to tracefs (need sudo)"
echo " --init: Initialize ftrace before applying (imply --apply)"
exit 1
}
[ $# -eq 0 ] && usage
BCONF=
DEBUG=
APPLY=
INIT=
while [ x"$1" != x ]; do
case "$1" in
"--debug")
DEBUG=$1;;
"--apply")
APPLY=$1;;
"--init")
APPLY=$1
INIT=$1;;
*)
[ ! -f $1 ] && usage
BCONF=$1;;
esac
shift 1
done
if [ x"$APPLY" != x ]; then
if [ `id -u` -ne 0 ]; then
echo "This must be run by root user. Try sudo." 1>&2
exec sudo $0 $DEBUG $APPLY $BCONF
fi
fi
run_cmd() { # command
echo "$*"
if [ x"$APPLY" != x ]; then # apply command
eval $*
fi
}
if [ x"$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." 1>&2
exit 1
fi
TRACEFS=`grep -m 1 -w debugfs /proc/mounts | cut -f 2 -d " "`/tracing
if [ ! -d $TRACEFS ]; then
echo "Error: ftrace is not enabled on this kernel." 1>&2
exit 1
fi
fi
if [ x"$INIT" != x ]; then
. `dirname $0`/ftrace.sh
(cd $TRACEFS; initialize_ftrace)
fi
. `dirname $0`/xbc.sh
######## main #########
set -e
xbc_init $BCONF
set_value_of() { # key file
if xbc_has_key $1; then
val=`xbc_get_val $1 1`
run_cmd "echo '$val' >> $2"
fi
}
set_array_of() { # key file
if xbc_has_key $1; then
xbc_get_val $1 | while read line; do
run_cmd "echo '$line' >> $2"
done
fi
}
compose_synth() { # event_name branch
echo -n "$1 "
xbc_get_val $2 | while read field; do echo -n "$field; "; done
}
setup_event() { # prefix group event [instance]
branch=$1.$2.$3
if [ "$4" ]; then
eventdir="$TRACEFS/instances/$4/events/$2/$3"
else
eventdir="$TRACEFS/events/$2/$3"
fi
case $2 in
kprobes)
xbc_get_val ${branch}.probes | while read line; do
run_cmd "echo 'p:kprobes/$3 $line' >> $TRACEFS/kprobe_events"
done
;;
synthetic)
run_cmd "echo '`compose_synth $3 ${branch}.fields`' >> $TRACEFS/synthetic_events"
;;
esac
set_value_of ${branch}.filter ${eventdir}/filter
set_array_of ${branch}.actions ${eventdir}/trigger
if xbc_has_key ${branch}.enable; then
run_cmd "echo 1 > ${eventdir}/enable"
fi
}
setup_events() { # prefix("ftrace" or "ftrace.instance.INSTANCE") [instance]
prefix="${1}.event"
if xbc_has_branch ${1}.event; then
for grpev in `xbc_subkeys ${1}.event 2`; do
setup_event $prefix ${grpev%.*} ${grpev#*.} $2
done
fi
}
size2kb() { # size[KB|MB]
case $1 in
*KB)
echo ${1%KB};;
*MB)
expr ${1%MB} \* 1024;;
*)
expr $1 / 1024 ;;
esac
}
setup_instance() { # [instance]
if [ "$1" ]; then
instance="ftrace.instance.${1}"
instancedir=$TRACEFS/instances/$1
else
instance="ftrace"
instancedir=$TRACEFS
fi
set_array_of ${instance}.options ${instancedir}/trace_options
set_value_of ${instance}.trace_clock ${instancedir}/trace_clock
set_value_of ${instance}.cpumask ${instancedir}/tracing_cpumask
set_value_of ${instance}.tracer ${instancedir}/current_tracer
set_array_of ${instance}.ftrace.filters \
${instancedir}/set_ftrace_filter
set_array_of ${instance}.ftrace.notrace \
${instancedir}/set_ftrace_notrace
if xbc_has_key ${instance}.alloc_snapshot; then
run_cmd "echo 1 > ${instancedir}/snapshot"
fi
if xbc_has_key ${instance}.buffer_size; then
size=`xbc_get_val ${instance}.buffer_size 1`
size=`eval size2kb $size`
run_cmd "echo $size >> ${instancedir}/buffer_size_kb"
fi
setup_events ${instance} $1
set_array_of ${instance}.events ${instancedir}/set_event
}
# ftrace global configs (kernel.*)
if xbc_has_key "kernel.dump_on_oops"; then
dump_mode=`xbc_get_val "kernel.dump_on_oops" 1`
[ "$dump_mode" ] && dump_mode=`eval echo $dump_mode` || dump_mode=1
run_cmd "echo \"$dump_mode\" > /proc/sys/kernel/ftrace_dump_on_oops"
fi
set_value_of kernel.fgraph_max_depth $TRACEFS/max_graph_depth
set_array_of kernel.fgraph_filters $TRACEFS/set_graph_function
set_array_of kernel.fgraph_notraces $TRACEFS/set_graph_notrace
# Per-instance/per-event configs
if ! xbc_has_branch "ftrace" ; then
exit 0
fi
setup_instance # root instance
if xbc_has_branch "ftrace.instance"; then
for i in `xbc_subkeys "ftrace.instance" 1`; do
run_cmd "mkdir -p $TRACEFS/instances/$i"
setup_instance $i
done
fi
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