[PATCH v2 3/3] sefltests/tracing: Add a test for tracepoint events on modules

Masami Hiramatsu (Google)
2024-06-01T08:22:59Z

From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Add a test case for tracepoint events on modules. This checks if it can add
and remove the events correctly.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
tools/testing/selftests/ftrace/config | 1 +
.../test.d/dynevent/add_remove_tprobe_module.tc | 34 ++++++++++++++++++++
2 files changed, 35 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe_module.tc

diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config
index 048a312abf40..544de0db5f58 100644
--- a/tools/testing/selftests/ftrace/config
+++ b/tools/testing/selftests/ftrace/config
@@ -20,6 +20,7 @@ CONFIG_PREEMPT_TRACER=y
CONFIG_PROBE_EVENTS_BTF_ARGS=y
CONFIG_SAMPLES=y
CONFIG_SAMPLE_FTRACE_DIRECT=m
+CONFIG_SAMPLE_TRACE_EVENTS=m
CONFIG_SAMPLE_TRACE_PRINTK=m
CONFIG_SCHED_TRACER=y
CONFIG_STACK_TRACER=y
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe_module.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe_module.tc
new file mode 100644
index 000000000000..2caed9454caa
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe_module.tc
@@ -0,0 +1,34 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Generic dynamic event - add/remove tracepoint probe events on module
+# requires: dynamic_events "t[:[<group>/][<event>]] <tracepoint> [<args>]":README
+
+rmmod trace-events-sample ||:
+if ! modprobe trace-events-sample ; then
+ echo "No trace-events sample module - please make CONFIG_SAMPLE_TRACE_EVENTS=m"
+ exit_unresolved;
+fi
+trap "rmmod trace-events-sample" EXIT
+
+echo 0 > events/enable
+echo > dynamic_events
+
+TRACEPOINT1=foo_bar
+TRACEPOINT2=foo_bar_with_cond
+
+echo "t:myevent1 $TRACEPOINT1" >> dynamic_events
+echo "t:myevent2 $TRACEPOINT2" >> dynamic_events
+
+grep -q myevent1 dynamic_events
+grep -q myevent2 dynamic_events
+test -d events/tracepoints/myevent1
+test -d events/tracepoints/myevent2
+
+echo "-:myevent2" >> dynamic_events
+
+grep -q myevent1 dynamic_events
+! grep -q myevent2 dynamic_events
+
+echo > dynamic_events
+
+clear_trace