linux-kernel - [PATCH] kunit: Mark filter

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Date: Thu, 11 Jan 2024 16:12:40 -0800
From: Lucas De Marchi <lucas.demarchi@...el.com>
To: linux-kernel@...r.kernel.org,
	kunit-dev@...glegroups.com,
	linux-kselftest@...r.kernel.org
Cc: David Gow <davidgow@...gle.com>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	<intel-xe@...ts.freedesktop.org>,
	Lucas De Marchi <lucas.demarchi@...el.com>
Subject: [PATCH] kunit: Mark filter_glob param as rw

By allowing the filter_glob parameter to be written to, it's possible to
tweak the testsuites that will be executed on new module loads. This
makes it easier to run specific tests without having to reload kunit and
provides a way to filter tests on real HW even if kunit is builtin.
Example for xe driver:

1) Run just 1 test
	# echo -n xe_bo > /sys/module/kunit/parameters/filter_glob
	# modprobe -r xe_live_test
	# modprobe xe_live_test
	# ls /sys/kernel/debug/kunit/
	xe_bo

2) Run all tests
	# echo \* > /sys/module/kunit/parameters/filter_glob
	# modprobe -r xe_live_test
	# modprobe xe_live_test
	# ls /sys/kernel/debug/kunit/
	xe_bo  xe_dma_buf  xe_migrate  xe_mocs

References: https://lore.kernel.org/intel-xe/dzacvbdditbneiu3e3fmstjmttcbne44yspumpkd6sjn56jqpk@vxu7sksbqrp6/
Signed-off-by: Lucas De Marchi <lucas.demarchi@...el.com>
---
 lib/kunit/executor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
index 1236b3cd2fbb..30ed9d321c19 100644
--- a/lib/kunit/executor.c
+++ b/lib/kunit/executor.c
@@ -31,7 +31,7 @@ static char *filter_glob_param;
 static char *filter_param;
 static char *filter_action_param;
 
-module_param_named(filter_glob, filter_glob_param, charp, 0400);
+module_param_named(filter_glob, filter_glob_param, charp, 0600);
 MODULE_PARM_DESC(filter_glob,
 		"Filter which KUnit test suites/tests run at boot-time, e.g. list* or list*.*del_test");
 module_param_named(filter, filter_param, charp, 0400);
-- 
2.40.1