[PATCH v2 14/18] tracing/remotes: selftests: Add a test for the dump_on_panic tracefs file

[Vincent Donnefort]

Exercise the newly introduced dump_on_panic tracefs file that turns on
or off the trace remote buffer dump on system panic.

Signed-off-by: Vincent Donnefort <vdonnefort@xxxxxxxxxx>

diff --git a/tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_panic.tc b/tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_panic.tc
new file mode 100644
index 000000000000..5e3d3c412ecd
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_panic.tc
@@ -0,0 +1,11 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Test hypervisor trace dump_on_panic
+# requires: remotes/hypervisor/write_event
+
+SOURCE_REMOTE_TEST=1
+. $TEST_DIR/remotes/dump_on_panic.tc
+
+set -e
+setup_remote "hypervisor"
+test_dump_on_panic
diff --git a/tools/testing/selftests/ftrace/test.d/remotes/dump_on_panic.tc b/tools/testing/selftests/ftrace/test.d/remotes/dump_on_panic.tc
new file mode 100644
index 000000000000..defc6f3a07ca
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/remotes/dump_on_panic.tc
@@ -0,0 +1,51 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Test trace remote dump_on_panic
+# requires: remotes/test
+
+. $TEST_DIR/remotes/functions
+
+test_dump_on_panic()
+{
+    #
+    # Toggle when the buffer is unloaded
+    #
+    echo 1 > dump_on_panic
+    echo 0 > dump_on_panic
+
+    #
+    # Toggle when the buffer is loaded
+    #
+    echo 1 > tracing_on
+    assert_loaded
+
+    echo 1 > dump_on_panic
+    echo 0 > dump_on_panic
+
+    #
+    # Load and unload buffer while dump_on_panic is enabled
+    #
+    echo 0 > tracing_on
+    assert_unloaded
+
+    echo 1 > dump_on_panic
+    echo 1 > tracing_on
+    echo 0 > tracing_on
+
+    # REMOVE ME FOR A PROPER OOPS TEST
+    return
+
+    echo 1 > tracing_on
+
+    for i in $(seq 1 32); do
+        echo $i > write_event
+    done
+
+    echo c > /proc/sysrq-trigger
+}
+
+if [ -z "$SOURCE_REMOTE_TEST" ]; then
+    set -e
+    setup_remote_test
+    test_dump_on_panic
+fi
diff --git a/tools/testing/selftests/ftrace/test.d/remotes/functions b/tools/testing/selftests/ftrace/test.d/remotes/functions
index 4a14aa72fdf0..bdd28b5b8596 100644
--- a/tools/testing/selftests/ftrace/test.d/remotes/functions
+++ b/tools/testing/selftests/ftrace/test.d/remotes/functions
@@ -9,6 +9,7 @@ setup_remote()
 	cd remotes/$name/
 	echo 0 > tracing_on
 	echo 0 > dmesg
+	echo 0 > dump_on_panic
 	clear_trace
 	echo 7 > buffer_size_kb
 	echo 0 > events/enable
-- 
2.54.0.1032.g2f8565e1d1-goog