[PATCH 2/3] drm: validate possible_crtcs for primary and cursor planes

[Simon Ser]

If a primary or cursor plane is not compatible with a CRTC it's attached
to via the legacy primary/cursor field, things will be broken for legacy
user-space.

Signed-off-by: Simon Ser <contact at emersion.fr>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Pekka Paalanen <ppaalanen at gmail.com>
---
 drivers/gpu/drm/drm_mode_config.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index f1affc1bb679..2c73a60e8765 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -625,6 +625,7 @@ static void validate_encoder_possible_crtcs(struct drm_encoder *encoder)
 void drm_mode_config_validate(struct drm_device *dev)
 {
 	struct drm_encoder *encoder;
+	struct drm_crtc *crtc;
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		return;
@@ -636,4 +637,19 @@ void drm_mode_config_validate(struct drm_device *dev)
 		validate_encoder_possible_clones(encoder);
 		validate_encoder_possible_crtcs(encoder);
 	}
+
+	drm_for_each_crtc(crtc, dev) {
+		if (crtc->primary) {
+			WARN(!(crtc->primary->possible_crtcs & BIT(crtc->index)),
+			     "Bogus primary plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
+			     crtc->primary->base.id, crtc->primary->name,
+			     crtc->base.id, crtc->name);
+		}
+		if (crtc->cursor) {
+			WARN(!(crtc->cursor->possible_crtcs & BIT(crtc->index)),
+			     "Bogus cursor plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
+			     crtc->cursor->base.id, crtc->cursor->name,
+			     crtc->base.id, crtc->name);
+		}
+	}
 }
-- 
2.29.2