drm/selftest: Refactor drm mode setting selftests

With this patch split the kernel module specific code from actual
selftest code. This is done to allow adding more selftests as separate
file. Also added kernel module exit stub with this patch.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: alexandru-cosmin.gheorghe@arm.com
Signed-off-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20181016204609.1555-1-drawat@vmware.com

drivers/gpu/drm/selftests/Makefile

-obj-$(CONFIG_DRM_DEBUG_SELFTEST) += test-drm_mm.o test-drm-helper.o
+test-drm_modeset-y := test-drm_modeset_common.o test-drm_plane_helper.o
+
+obj-$(CONFIG_DRM_DEBUG_SELFTEST) += test-drm_mm.o test-drm_modeset.o

drivers/gpu/drm/selftests/test-drm_modeset_common.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Common file for modeset selftests.
+ */
+
+#include <linux/module.h>
+
+#include "test-drm_modeset_common.h"
+
+static int __init test_drm_modeset_init(void)
+{
+	return test_drm_plane_helper();
+}
+
+static void __exit test_drm_modeset_exit(void)
+{
+}
+
+module_init(test_drm_modeset_init);
+module_exit(test_drm_modeset_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL");

drivers/gpu/drm/selftests/test-drm_modeset_common.h

+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __TEST_DRM_MODESET_COMMON_H__
+#define __TEST_DRM_MODESET_COMMON_H__
+
+#define FAIL(test, msg, ...) \
+	do { \
+		if (test) { \
+			pr_err("%s/%u: " msg, __FUNCTION__, __LINE__, ##__VA_ARGS__); \
+			return -EINVAL; \
+		} \
+	} while (0)
+
+#define FAIL_ON(x) FAIL((x), "%s", "FAIL_ON(" __stringify(x) ")\n")
+
+int test_drm_plane_helper(void);
+
+#endif

drivers/gpu/drm/selftests/test-drm-helper.c → drivers/gpu/drm/selftests/test-drm_plane_helper.c

+// SPDX-License-Identifier: GPL-2.0
 /*
- * Test cases for the drm_kms_helper functions
+ * Test cases for the drm_plane_helper functions
  */
 
-#define pr_fmt(fmt) "drm_kms_helper: " fmt
-
-#include <linux/module.h>
+#define pr_fmt(fmt) "drm_plane_helper: " fmt
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_modes.h>
 
-#define TESTS "drm_helper_selftests.h"
-#include "drm_selftest.h"
-
-#define FAIL(test, msg, ...) \
-	do { \
-		if (test) { \
-			pr_err("%s/%u: " msg, __FUNCTION__, __LINE__, ##__VA_ARGS__); \
-			return -EINVAL; \
-		} \
-	} while (0)
+#include "test-drm_modeset_common.h"
 
-#define FAIL_ON(x) FAIL((x), "%s", "FAIL_ON(" __stringify(x) ")\n")
+#define TESTS "drm_plane_helper_selftests.h"
+#include "drm_selftest.h"
 
 static void set_src(struct drm_plane_state *plane_state,
 		    unsigned src_x, unsigned src_y,
@@ -232,7 +223,10 @@ static int igt_check_plane_state(void *ignored)
 
 #include "drm_selftest.c"
 
-static int __init test_drm_helper_init(void)
+/**
+ * test_drm_plane_helper - Run drm plane helper selftests.
+ */
+int test_drm_plane_helper(void)
 {
 	int err;
 
@@ -240,8 +234,3 @@ static int __init test_drm_helper_init(void)
 
 	return err > 0 ? 0 : err;
 }
-
-module_init(test_drm_helper_init);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_LICENSE("GPL");