drm/panic: Compile KUnit tests as module

Fix dependency of the panic-helper KUnit tests on CONFIG_DRM_KUNIT_TEST=y
and make them build as a module. Export the necessary interfaces from the
panic helpers iff the KUnit framework has been enabled.

Select DRM_PANIC_HELPER from DRM_KUNIT_TEST to meet the dependencies of
the panic-helper tests.

It is now possible to run the tests by modprobe-ing drm_panic_helper_test
at runtime.

v5:
- clear test description with drm_panic_helper_clear_description() (Sashiko)
v3:
- clean up after each test case (Sashiko)
v2:
- fix parameter order in decl of drm_panic_helper_draw_screen_qr()
  (Sashiko)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patch.msgid.link/20260911124540.279841-15-tzimmermann@suse.de

1 files changed, 9 insertions, 0 deletions

diff --git a/include/drm/drm_panic_helper.h b/include/drm/drm_panic_helper.h
index 6cc9a0eba077..fbfe51161aef 100644
--- a/include/drm/drm_panic_helper.h
+++ b/include/drm/drm_panic_helper.h
@@ -8,6 +8,7 @@
 enum drm_panic_type;
 
 struct drm_plane;
+struct drm_scanout_buffer;
 
 /* drm_panic_helper.c */
 int drm_plane_helper_display_panic_screen(struct drm_plane *plane,
@@ -15,6 +16,14 @@ int drm_plane_helper_display_panic_screen(struct drm_plane *plane,
 					  enum drm_panic_type panic_type,
 					  u32 fg_color, u32 bg_color,
 					  unsigned int qr_version);
+#if IS_ENABLED(CONFIG_KUNIT)
+int drm_panic_helper_draw_screen_user(struct drm_scanout_buffer *sb, u32 fg_color, u32 bg_color);
+int drm_panic_helper_draw_screen_kmsg(struct drm_scanout_buffer *sb, u32 fg_color, u32 bg_color);
+int drm_panic_helper_draw_screen_qr_code(struct drm_scanout_buffer *sb,
+					 u32 fg_color, u32 bg_color, unsigned int qr_version);
+void drm_panic_helper_set_description(const char *description);
+void drm_panic_helper_clear_description(void);
+#endif
 
 /* drm_panic_helper_qr.rs */
 size_t drm_panic_helper_qr_max_data_size(u8 version, size_t url_len);