drm/{i915,xe}/fb: add panic pointer member to struct intel_framebuffer

Add a panic data pointer member in struct intel_framebuffer in
preparation for breaking the artificial subclassing between
intel_framebuffer and panic structures.

Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: Maarten Lankhorst <dev@lankhorst.se>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/41f42e1de8545409274d54854aa12e0fb390e394.1756835342.git.jani.nikula@intel.com

Author: jnikula

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -149,6 +149,7 @@ struct intel_framebuffer {
 	unsigned int vtd_guard;
 
 	unsigned int (*panic_tiling)(unsigned int x, unsigned int y, unsigned int width);
+	void *panic;
 };
 
 enum intel_hotplug_state {

drivers/gpu/drm/i915/gem/i915_gem_pages.c

@@ -368,11 +368,6 @@ struct i915_framebuffer {
 	struct i915_panic_data panic;
 };
 
-static inline struct i915_panic_data *to_i915_panic_data(struct intel_framebuffer *fb)
-{
-	return &container_of_const(fb, struct i915_framebuffer, base)->panic;
-}
-
 static void i915_panic_kunmap(struct i915_panic_data *panic)
 {
 	if (panic->vaddr) {
@@ -420,7 +415,7 @@ static void i915_gem_object_panic_page_set_pixel(struct drm_scanout_buffer *sb,
 	unsigned int new_page;
 	unsigned int offset;
 	struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private;
-	struct i915_panic_data *panic = to_i915_panic_data(fb);
+	struct i915_panic_data *panic = fb->panic;
 
 	if (fb->panic_tiling)
 		offset = fb->panic_tiling(sb->width, x, y);
@@ -446,9 +441,12 @@ struct intel_framebuffer *i915_gem_object_alloc_framebuffer(void)
 	struct i915_framebuffer *i915_fb;
 
 	i915_fb = kzalloc(sizeof(*i915_fb), GFP_KERNEL);
-	if (i915_fb)
-		return &i915_fb->base;
-	return NULL;
+	if (!i915_fb)
+		return NULL;
+
+	i915_fb->base.panic = &i915_fb->panic;
+
+	return &i915_fb->base;
 }
 
 /*
@@ -460,7 +458,7 @@ int i915_gem_object_panic_setup(struct drm_scanout_buffer *sb)
 {
 	enum i915_map_type has_type;
 	struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private;
-	struct i915_panic_data *panic = to_i915_panic_data(fb);
+	struct i915_panic_data *panic = fb->panic;
 	struct drm_i915_gem_object *obj = to_intel_bo(intel_fb_bo(&fb->base));
 	void *ptr;
 
@@ -488,7 +486,7 @@ int i915_gem_object_panic_setup(struct drm_scanout_buffer *sb)
 
 void i915_gem_object_panic_finish(struct intel_framebuffer *fb)
 {
-	struct i915_panic_data *panic = to_i915_panic_data(fb);
+	struct i915_panic_data *panic = fb->panic;
 
 	i915_panic_kunmap(panic);
 	panic->page = -1;

drivers/gpu/drm/xe/display/xe_panic.c

@@ -20,11 +20,6 @@ struct xe_framebuffer {
 	struct xe_panic_data panic;
 };
 
-static inline struct xe_panic_data *to_xe_panic_data(struct intel_framebuffer *fb)
-{
-	return &container_of_const(fb, struct xe_framebuffer, base)->panic;
-}
-
 static void xe_panic_kunmap(struct xe_panic_data *panic)
 {
 	if (panic->vaddr) {
@@ -43,7 +38,7 @@ static void xe_panic_page_set_pixel(struct drm_scanout_buffer *sb, unsigned int
 				    unsigned int y, u32 color)
 {
 	struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private;
-	struct xe_panic_data *panic = to_xe_panic_data(fb);
+	struct xe_panic_data *panic = fb->panic;
 	struct xe_bo *bo = gem_to_xe_bo(intel_fb_bo(&fb->base));
 	unsigned int new_page;
 	unsigned int offset;
@@ -72,15 +67,18 @@ struct intel_framebuffer *intel_bo_alloc_framebuffer(void)
 	struct xe_framebuffer *xe_fb;
 
 	xe_fb = kzalloc(sizeof(*xe_fb), GFP_KERNEL);
-	if (xe_fb)
-		return &xe_fb->base;
-	return NULL;
+	if (!xe_fb)
+		return NULL;
+
+	xe_fb->base.panic = &xe_fb->panic;
+
+	return &xe_fb->base;
 }
 
 int intel_panic_setup(struct drm_scanout_buffer *sb)
 {
 	struct intel_framebuffer *fb = (struct intel_framebuffer *)sb->private;
-	struct xe_panic_data *panic = to_xe_panic_data(fb);
+	struct xe_panic_data *panic = fb->panic;
 
 	panic->page = -1;
 	sb->set_pixel = xe_panic_page_set_pixel;
@@ -89,7 +87,7 @@ int intel_panic_setup(struct drm_scanout_buffer *sb)
 
 void intel_panic_finish(struct intel_framebuffer *fb)
 {
-	struct xe_panic_data *panic = to_xe_panic_data(fb);
+	struct xe_panic_data *panic = fb->panic;
 
 	xe_panic_kunmap(panic);
 	panic->page = -1;