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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-08 12:19:14 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-13 09:36:49 -0500
commit646f01ccdd59f989f0a1866d2b3503e1855358d8 (patch)
tree43ff72733bc74a70358ca823462f8979e13ed1b4
parentftrace: Add sample module that uses register_ftrace_direct() (diff)
downloadwireguard-linux-646f01ccdd59f989f0a1866d2b3503e1855358d8.tar.xz
wireguard-linux-646f01ccdd59f989f0a1866d2b3503e1855358d8.zip
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: Steven Rostedt (VMware) <rostedt@goodmis.org>
-rw-r--r--tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc53
-rw-r--r--tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc71
2 files changed, 124 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc b/tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc
new file mode 100644
index 000000000000..8b8ed3cad51b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/direct/ftrace-direct.tc
@@ -0,0 +1,53 @@
+#!/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 $t
+ fi
+done
+
+echo nop > current_tracer
+rmmod ftrace-direct ||:
diff --git a/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc b/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc
new file mode 100644
index 000000000000..f030dc80bcde
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/direct/kprobe-direct.tc
@@ -0,0 +1,71 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Test ftrace direct functions against kprobes
+
+rmmod ftrace-direct ||:
+if ! modprobe ftrace-direct ; then
+ echo "No ftrace-direct sample module - please build with CONFIG_SAMPLE_FTRACE_DIRECT=m"
+ exit_unresolved;
+fi
+
+if [ ! -f kprobe_events ]; then
+ echo "No kprobe_events file -please build CONFIG_KPROBE_EVENTS"
+ exit_unresolved;
+fi
+
+echo "Let the module run a little"
+sleep 1
+
+grep -q "my_direct_func: wakeing up" trace
+
+rmmod ftrace-direct
+
+echo 'p:kwake wake_up_process task=$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