linux-kernel - [PATCH v2] kunit: Mark filter* params as rw

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Date: Mon, 22 Jan 2024 09:14:08 -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: Lucas De Marchi <lucas.demarchi@...el.com>,
	"Krzysztofik, Janusz" <janusz.krzysztofik@...el.com>,
	Rae Moar <rmoar@...gle.com>,
	"David Gow" <davidgow@...gle.com>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	"intel-xe@...ts.freedesktop.org" <intel-xe@...ts.freedesktop.org>
Subject: [PATCH v2] kunit: Mark filter* params 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

For completeness and to cover other use cases, also change filter and
filter_action to rw.

Link: https://lore.kernel.org/intel-xe/dzacvbdditbneiu3e3fmstjmttcbne44yspumpkd6sjn56jqpk@vxu7sksbqrp6/
Reviewed-by: Rae Moar <rmoar@...gle.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@...el.com>
---

Rae, I kept your r-b from v1 since the additions are just what we talked
about.

v2: also change filter_action and filter to rw, testing with the xe
    module to see if filter=module=none filter_action=skip produces
    the result expected by igt

 lib/kunit/executor.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
index 1236b3cd2fbb..371ddcee7fb5 100644
--- a/lib/kunit/executor.c
+++ b/lib/kunit/executor.c
@@ -31,13 +31,13 @@ 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);
+module_param_named(filter, filter_param, charp, 0600);
 MODULE_PARM_DESC(filter,
 		"Filter which KUnit test suites/tests run at boot-time using attributes, e.g. speed>slow");
-module_param_named(filter_action, filter_action_param, charp, 0400);
+module_param_named(filter_action, filter_action_param, charp, 0600);
 MODULE_PARM_DESC(filter_action,
 		"Changes behavior of filtered tests using attributes, valid values are:\n"
 		"<none>: do not run filtered tests as normal\n"
-- 
2.40.1