[for-next][PATCH 06/26] tools/bootconfig: Add --init option for bconf2ftrace.sh

Steven Rostedt
2020-09-22T01:26:26Z

Since the ftrace current setting may conflict with the new setting
from bootconfig, add the --init option to initialize ftrace before
setting for bconf2ftrace.sh.

E.g.
$ bconf2ftrace.sh --init boottrace.bconf

This initialization method copied from selftests/ftrace.

Link: https://lkml.kernel.org/r/159704853203.175360.17029578033994278231.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
tools/bootconfig/scripts/bconf2ftrace.sh | 12 ++-
tools/bootconfig/scripts/ftrace.sh | 109 +++++++++++++++++++++++
2 files changed, 120 insertions(+), 1 deletion(-)
create mode 100644 tools/bootconfig/scripts/ftrace.sh

diff --git a/tools/bootconfig/scripts/bconf2ftrace.sh b/tools/bootconfig/scripts/bconf2ftrace.sh
index a46e984fb2ff..595e164dc352 100755
--- a/tools/bootconfig/scripts/bconf2ftrace.sh
+++ b/tools/bootconfig/scripts/bconf2ftrace.sh
@@ -3,8 +3,9 @@

usage() {
echo "Ftrace boottime trace test tool"
- echo "Usage: $0 [--apply] [--debug] BOOTCONFIG-FILE"
+ 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
}

@@ -13,12 +14,16 @@ 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=$1;;
@@ -57,6 +62,11 @@ if [ -z "$TRACEFS" ]; then
fi
fi

+if [ x"$INIT" != x ]; then
+ . `dirname $0`/ftrace.sh
+ (cd $TRACEFS; initialize_ftrace)
+fi
+
. `dirname $0`/xbc.sh

######## main #########
diff --git a/tools/bootconfig/scripts/ftrace.sh b/tools/bootconfig/scripts/ftrace.sh
new file mode 100644
index 000000000000..186eed923041
--- /dev/null
+++ b/tools/bootconfig/scripts/ftrace.sh
@@ -0,0 +1,109 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+clear_trace() { # reset trace output
+ echo > trace
+}
+
+disable_tracing() { # stop trace recording
+ echo 0 > tracing_on
+}
+
+enable_tracing() { # start trace recording
+ echo 1 > tracing_on
+}
+
+reset_tracer() { # reset the current tracer
+ echo nop > current_tracer
+}
+
+reset_trigger_file() {
+ # remove action triggers first
+ grep -H ':on[^:]*(' $@ |
+ while read line; do
+ cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
+ file=`echo $line | cut -f1 -d:`
+ echo "!$cmd" >> $file
+ done
+ grep -Hv ^# $@ |
+ while read line; do
+ cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
+ file=`echo $line | cut -f1 -d:`
+ echo "!$cmd" > $file
+ done
+}
+
+reset_trigger() { # reset all current setting triggers
+ if [ -d events/synthetic ]; then
+ reset_trigger_file events/synthetic/*/trigger
+ fi
+ reset_trigger_file events/*/*/trigger
+}
+
+reset_events_filter() { # reset all current setting filters
+ grep -v ^none events/*/*/filter |
+ while read line; do
+ echo 0 > `echo $line | cut -f1 -d:`
+ done
+}
+
+reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
+ if [ ! -f set_ftrace_filter ]; then
+ return 0
+ fi
+ echo > set_ftrace_filter
+ grep -v '^#' set_ftrace_filter | while read t; do
+ tr=`echo $t | cut -d: -f2`
+ if [ "$tr" = "" ]; then
+ continue
+ fi
+ if ! grep -q "$t" set_ftrace_filter; then
+ continue;
+ fi
+ name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
+ if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
+ tr=`echo $t | cut -d: -f2-4`
+ limit=`echo $t | cut -d: -f5`
+ else
+ tr=`echo $t | cut -d: -f2`
+ limit=`echo $t | cut -d: -f3`
+ fi
+ if [ "$limit" != "unlimited" ]; then
+ tr="$tr:$limit"
+ fi
+ echo "!$name:$tr" > set_ftrace_filter
+ done
+}
+
+disable_events() {
+ echo 0 > events/enable
+}
+
+clear_synthetic_events() { # reset all current synthetic events
+ grep -v ^# synthetic_events |
+ while read line; do
+ echo "!$line" >> synthetic_events
+ done
+}
+
+initialize_ftrace() { # Reset ftrace to initial-state
+# As the initial state, ftrace will be set to nop tracer,
+# no events, no triggers, no filters, no function filters,
+# no probes, and tracing on.
+ disable_tracing
+ reset_tracer
+ reset_trigger
+ reset_events_filter
+ reset_ftrace_filter
+ disable_events
+ [ -f set_event_pid ] && echo > set_event_pid
+ [ -f set_ftrace_pid ] && echo > set_ftrace_pid
+ [ -f set_ftrace_notrace ] && echo > set_ftrace_notrace
+ [ -f set_graph_function ] && echo | tee set_graph_*
+ [ -f stack_trace_filter ] && echo > stack_trace_filter
+ [ -f kprobe_events ] && echo > kprobe_events
+ [ -f uprobe_events ] && echo > uprobe_events
+ [ -f synthetic_events ] && echo > synthetic_events
+ [ -f snapshot ] && echo 0 > snapshot
+ clear_trace
+ enable_tracing
+}
--
2.28.0