[PATCH v5 1/2] drm/tests: Split drm_framebuffer_create_test into parameterized tests

[Maíra Canal]

The igt_check_drm_framebuffer_create is based on a loop that executes
tests for all createbuffer_tests test cases. This could be better
represented by parameterized tests, provided by KUnit.

So, convert the igt_check_drm_framebuffer_create into parameterized tests.

Signed-off-by: Maíra Canal <mairacanal@xxxxxxxxxx>
Reviewed-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
Reviewed-by: David Gow <davidgow@xxxxxxxxxx>
---
v1 -> v2: https://lore.kernel.org/dri-devel/20220830211603.191734-1-mairacanal@xxxxxxxxxx/
- Use .init for mock_drm_device instead of a global variable. (Michał Winiarski)
- Add Michał's Reviewed-by tag.

v2 -> v3: https://lore.kernel.org/dri-devel/20220901124210.591994-1-mairacanal@xxxxxxxxxx/
- Add David's Reviewed-by tag.

v3 -> v4: https://lore.kernel.org/dri-devel/20220907200247.89679-1-mairacanal@xxxxxxxxxx/
- No changes.

v4 -> v5: https://lore.kernel.org/dri-devel/202209110709.ZO1yJeyE-lkp@xxxxxxxxx/T/#mac65eb9447b57f1ebbe7cc516f38c11c7a076295
- Reduce stack usage on drm_framebuffer_test_init (kernel test bot).
---
 drivers/gpu/drm/tests/drm_framebuffer_test.c | 53 +++++++++++---------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_framebuffer_test.c b/drivers/gpu/drm/tests/drm_framebuffer_test.c
index ec7a08ba4056..df235b7fdaa5 100644
--- a/drivers/gpu/drm/tests/drm_framebuffer_test.c
+++ b/drivers/gpu/drm/tests/drm_framebuffer_test.c
@@ -25,7 +25,7 @@ struct drm_framebuffer_test {
 	const char *name;
 };
 
-static struct drm_framebuffer_test createbuffer_tests[] = {
+static const struct drm_framebuffer_test drm_framebuffer_create_cases[] = {
 { .buffer_created = 1, .name = "ABGR8888 normal sizes",
 	.cmd = { .width = 600, .height = 600, .pixel_format = DRM_FORMAT_ABGR8888,
 		 .handles = { 1, 0, 0 }, .pitches = { 4 * 600, 0, 0 },
@@ -330,43 +330,50 @@ static struct drm_mode_config_funcs mock_config_funcs = {
 	.fb_create = fb_create_mock,
 };
 
-static struct drm_device mock_drm_device = {
-	.mode_config = {
-		.min_width = MIN_WIDTH,
-		.max_width = MAX_WIDTH,
-		.min_height = MIN_HEIGHT,
-		.max_height = MAX_HEIGHT,
-		.funcs = &mock_config_funcs,
-	},
-};
+static int drm_framebuffer_test_init(struct kunit *test)
+{
+	struct drm_device *mock;
+
+	mock = kunit_kzalloc(test, sizeof(*mock), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, mock);
 
-static int execute_drm_mode_fb_cmd2(struct drm_mode_fb_cmd2 *r)
+	mock->mode_config.min_width = MIN_WIDTH;
+	mock->mode_config.max_width = MAX_WIDTH;
+	mock->mode_config.min_height = MIN_HEIGHT;
+	mock->mode_config.max_height = MAX_HEIGHT;
+	mock->mode_config.funcs = &mock_config_funcs;
+
+	test->priv = mock;
+	return 0;
+}
+
+static void drm_test_framebuffer_create(struct kunit *test)
 {
+	const struct drm_framebuffer_test *params = test->param_value;
+	struct drm_device *mock = test->priv;
 	int buffer_created = 0;
 
-	mock_drm_device.dev_private = &buffer_created;
-	drm_internal_framebuffer_create(&mock_drm_device, r, NULL);
-	return buffer_created;
+	mock->dev_private = &buffer_created;
+	drm_internal_framebuffer_create(mock, &params->cmd, NULL);
+	KUNIT_EXPECT_EQ(test, params->buffer_created, buffer_created);
 }
 
-static void igt_check_drm_framebuffer_create(struct kunit *test)
+static void drm_framebuffer_test_to_desc(const struct drm_framebuffer_test *t, char *desc)
 {
-	int i = 0;
-
-	for (i = 0; i < ARRAY_SIZE(createbuffer_tests); i++) {
-		KUNIT_EXPECT_EQ_MSG(test, createbuffer_tests[i].buffer_created,
-				    execute_drm_mode_fb_cmd2(&createbuffer_tests[i].cmd),
-		     "Test %d: \"%s\" failed\n", i, createbuffer_tests[i].name);
-	}
+	strcpy(desc, t->name);
 }
 
+KUNIT_ARRAY_PARAM(drm_framebuffer_create, drm_framebuffer_create_cases,
+		  drm_framebuffer_test_to_desc);
+
 static struct kunit_case drm_framebuffer_tests[] = {
-	KUNIT_CASE(igt_check_drm_framebuffer_create),
+	KUNIT_CASE_PARAM(drm_test_framebuffer_create, drm_framebuffer_create_gen_params),
 	{ }
 };
 
 static struct kunit_suite drm_framebuffer_test_suite = {
 	.name = "drm_framebuffer",
+	.init = drm_framebuffer_test_init,
 	.test_cases = drm_framebuffer_tests,
 };
 
-- 
2.37.3