linux-kernel - [RFC PATCH 5/6] selftests: tracing: Add a basic testcase for wprobe

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Message-ID: <175673792989.478080.12561167604736619473.stgit@devnote2>
Date: Mon,  1 Sep 2025 23:45:29 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	x86@...nel.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Ian Rogers <irogers@...gle.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: [RFC PATCH 5/6] selftests: tracing: Add a basic testcase for wprobe

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

Add 'add_remove_wprobe.tc' testcase for testing wprobe event that
tests adding and removing operations of the wprobe event.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 .../ftrace/test.d/dynevent/add_remove_wprobe.tc    |   68 ++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc

diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc
new file mode 100644
index 000000000000..20774c7f69f8
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_wprobe.tc
@@ -0,0 +1,68 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Generic dynamic event - add/remove wprobe events
+# requires: dynamic_events "w[:[<group>/][<event>]] [r|w|rw]@<addr>[:<len>]":README
+
+echo 0 > events/enable
+echo > dynamic_events
+
+# Use jiffies as a variable that is frequently written to.
+TARGET=jiffies
+
+echo "w:my_wprobe w@...RGET" >> dynamic_events
+
+grep -q my_wprobe dynamic_events
+if [ $? -ne 0 ]; then
+    echo "Failed to create wprobe event"
+    exit_fail
+fi
+
+test -d events/wprobes/my_wprobe
+if [ $? -ne 0 ]; then
+    echo "Failed to create wprobe event directory"
+    exit_fail
+fi
+
+echo 1 > events/wprobes/my_wprobe/enable
+
+# Check if the event is enabled
+cat events/wprobes/my_wprobe/enable | grep -q 1
+if [ $? -ne 0 ]; then
+    echo "Failed to enable wprobe event"
+    exit_fail
+fi
+
+# Let some time pass to trigger the breakpoint
+sleep 1
+
+# Check if we got any trace output
+if !grep -q my_wprobe trace; then
+    echo "wprobe event was not triggered"
+fi
+
+echo 0 > events/wprobes/my_wprobe/enable
+
+# Check if the event is disabled
+cat events/wprobes/my_wprobe/enable | grep -q 0
+if [ $? -ne 0 ]; then
+    echo "Failed to disable wprobe event"
+    exit_fail
+fi
+
+echo "-:my_wprobe" >> dynamic_events
+
+! grep -q my_wprobe dynamic_events
+if [ $? -ne 0 ]; then
+    echo "Failed to remove wprobe event"
+    exit_fail
+fi
+
+! test -d events/wprobes/my_wprobe
+if [ $? -ne 0 ]; then
+    echo "Failed to remove wprobe event directory"
+    exit_fail
+fi
+
+clear_trace
+
+exit 0