linux-kernel - [PATCH 2/2] selftests: input: Add tracepoint testing script

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Message-ID: <D63FD07A2C7FF319+20250710073148.3994900-2-wangyuli@uniontech.com>
Date: Thu, 10 Jul 2025 15:31:39 +0800
From: WangYuli <wangyuli@...ontech.com>
To: wangyuli@...ontech.com
Cc: dmitry.torokhov@...il.com,
	guanwentao@...ontech.com,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	mathieu.desnoyers@...icios.com,
	mhiramat@...nel.org,
	niecheng1@...ontech.com,
	rostedt@...dmis.org,
	wangyuli@...pin.org,
	zhanjun@...ontech.com
Subject: [PATCH 2/2] selftests: input: Add tracepoint testing script

Add a test script for the input subsystem tracepoints.

The script provides:
 - Automatic detection of available input tracepoints
 - Privilege and filesystem mount validation
 - Interactive testing with real-time trace monitoring
 - Support for both batch and live trace analysis

The script enables easy validation and demonstration of the input
tracepoint functionality, making it easier for developers to verify
the implementation and understand the tracepoint capabilities.

Usage:
  sudo ./tools/testing/selftests/input/test_input_tracepoints.sh

Signed-off-by: WangYuli <wangyuli@...ontech.com>
---
 MAINTAINERS                                   |  2 +
 .../selftests/input/test_input_tracepoints.sh | 78 +++++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100755 tools/testing/selftests/input/test_input_tracepoints.sh

diff --git a/MAINTAINERS b/MAINTAINERS
index c1b03679a5a1..8a0920734303 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11940,6 +11940,7 @@ F:	include/uapi/linux/input-event-codes.h
 F:	include/uapi/linux/input.h
 F:	include/uapi/linux/serio.h
 F:	include/uapi/linux/uinput.h
+F:	tools/testing/selftests/input/
 
 INPUT MULTITOUCH (MT) PROTOCOL
 M:	Henrik Rydberg <rydberg@...math.org>
@@ -25211,6 +25212,7 @@ F:	kernel/trace/
 F:	kernel/tracepoint.c
 F:	scripts/tracing/
 F:	tools/testing/selftests/ftrace/
+F:	tools/testing/selftests/input/test_input_tracepoints.sh
 
 TRACING MMIO ACCESSES (MMIOTRACE)
 M:	Steven Rostedt <rostedt@...dmis.org>
diff --git a/tools/testing/selftests/input/test_input_tracepoints.sh b/tools/testing/selftests/input/test_input_tracepoints.sh
new file mode 100755
index 000000000000..6ade2619b62d
--- /dev/null
+++ b/tools/testing/selftests/input/test_input_tracepoints.sh
@@ -0,0 +1,78 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+###############################################################################
+#
+# Input subsystem tracepoint testing script
+#
+# AUTHOR
+#      WangYuli <wangyuli@...ontech.com>
+#
+###############################################################################
+
+DEBUGFS_PATH="/sys/kernel/debug/tracing"
+INPUT_EVENTS_PATH="${DEBUGFS_PATH}/events/input"
+
+# Check if we have sufficient privileges
+if [ ! -w "$DEBUGFS_PATH" ]; then
+    echo "Error: Root privileges required to access tracing system"
+    echo "Please run: sudo $0"
+    exit 1
+fi
+
+# Check if debugfs is mounted
+if [ ! -d "$DEBUGFS_PATH" ]; then
+    echo "Error: debugfs is not mounted"
+    echo "Please run: mount -t debugfs none /sys/kernel/debug"
+    exit 1
+fi
+
+# Check if input tracepoints exist
+if [ ! -d "$INPUT_EVENTS_PATH" ]; then
+    echo "Error: input tracepoints not found, kernel may need to be recompiled"
+    exit 1
+fi
+
+echo "=== Input Subsystem Tracepoint Test ==="
+echo
+
+# Clear existing trace buffer
+echo > "${DEBUGFS_PATH}/trace"
+
+# List available input tracepoints
+echo "Available Input Tracepoints:"
+for event in "${INPUT_EVENTS_PATH}"/*; do
+    if [ -d "$event" ]; then
+        event_name=$(basename "$event")
+        echo "  - $event_name"
+    fi
+done
+echo
+
+# Enable all input tracepoints
+echo "Enabling all input tracepoints..."
+echo 1 > "${INPUT_EVENTS_PATH}/enable"
+
+if [ $? -eq 0 ]; then
+    echo "✓ Successfully enabled input tracepoints"
+else
+    echo "✗ Failed to enable input tracepoints"
+    exit 1
+fi
+
+echo
+echo "Please perform some operations in another terminal (keyboard input, mouse movement, etc.)"
+echo "or plug/unplug USB devices, then come back to view the results..."
+echo
+echo "Press any key to continue viewing trace output (press Ctrl+C to exit)..."
+read -n 1
+
+echo
+echo "=== Trace Output ==="
+echo "(Last 100 lines)"
+tail -n 100 "${DEBUGFS_PATH}/trace"
+
+echo
+echo "=== Real-time Trace Output ==="
+echo "(Press Ctrl+C to stop)"
+cat "${DEBUGFS_PATH}/trace_pipe"
-- 
2.50.0