Commit 646f01cc authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

ftrace/selftest: Add tests to test register_ftrace_direct() 



Add two test cases that test the new ftrace direct functionality if the
ftrace-direct sample module is available. One test case tests against each
available tracer (function, function_graph, mmiotrace, etc), and the other
test tests against a kprobe at the same location as the direct caller. Both
tests follow the same pattern of testing combinations:

  enable test (either the tracer or the kprobe)
  load direct function module
  unload direct function module
  disable test

  enable test
  load direct function module
  disable test
  unload direct function module

  load direct function module
  enable test
  disable test
  unload direct function module

  load direct function module
  enable test
  unload direct function module
  disable test

As most the bugs in development happened with various ways of enabling or
disabling the direct calls with function tracer in one of these
combinations.

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent b06457c8

tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc

0 → 100644
+53 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Test ftrace direct functions against tracers



rmmod ftrace-direct ||:

if ! modprobe ftrace-direct ; then

  echo "No ftrace-direct sample module - please make CONFIG_SAMPLE_FTRACE_DIRECT=m"

  exit_unresolved;

fi



echo "Let the module run a little"

sleep 1



grep -q "my_direct_func: wakeing up" trace



rmmod ftrace-direct



test_tracer() {

	tracer=$1



	# tracer -> direct -> no direct > no tracer

	echo $tracer > current_tracer

	modprobe ftrace-direct

	rmmod ftrace-direct

	echo nop > current_tracer



	# tracer -> direct -> no tracer > no direct

	echo $tracer > current_tracer

	modprobe ftrace-direct

	echo nop > current_tracer

	rmmod ftrace-direct



	# direct -> tracer -> no tracer > no direct

	modprobe ftrace-direct

	echo $tracer > current_tracer

	echo nop > current_tracer

	rmmod ftrace-direct



	# direct -> tracer -> no direct > no notracer

	modprobe ftrace-direct

	echo $tracer > current_tracer

	rmmod ftrace-direct

	echo nop > current_tracer

}



for t in `cat available_tracers`; do

	if [ "$t" != "nop" ]; then

		test_tracer $t

	fi

done



echo nop > current_tracer

rmmod ftrace-direct ||:

tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc

0 → 100644
+71 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Test ftrace direct functions against kprobes



rmmod ftrace-direct ||:

if ! modprobe ftrace-direct ; then

  echo "No ftrace-direct sample module - please build with CONFIG_SAMPLE_FTRACE_DIRECT=m"

  exit_unresolved;

fi



if [ ! -f kprobe_events ]; then

	echo "No kprobe_events file -please build CONFIG_KPROBE_EVENTS"

	exit_unresolved;

fi



echo "Let the module run a little"

sleep 1



grep -q "my_direct_func: wakeing up" trace



rmmod ftrace-direct



echo 'p:kwake wake_up_process task=$arg1' > kprobe_events



start_direct() {

	echo > trace

	modprobe ftrace-direct

	sleep 1

	grep -q "my_direct_func: wakeing up" trace

}



stop_direct() {

	rmmod ftrace-direct

}



enable_probe() {

	echo > trace

	echo 1 > events/kprobes/kwake/enable

	sleep 1

	grep -q "kwake:" trace

}



disable_probe() {

	echo 0 > events/kprobes/kwake/enable

}



# probe -> direct -> no direct > no probe

enable_probe

start_direct

stop_direct

disable_probe



# probe -> direct -> no probe > no direct

enable_probe

start_direct

disable_probe

stop_direct



# direct -> probe -> no probe > no direct

start_direct

enable_probe

disable_probe

stop_direct



# direct -> probe -> no direct > no noprobe

start_direct

enable_probe

stop_direct

disable_probe



echo > kprobe_events

CRA Git | Maintained and supported by SUSTech CRA and CCSE