drm/i915/display: move global_obj_list under display sub-struct

Move display global state member under drm_i915_private display
sub-struct.

Prefer adding anonymous sub-structs even for single members that aren't
our own structs.

Remove a nearby stale comment while at it.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221109144209.3624739-3-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -8572,7 +8572,7 @@ static void intel_mode_config_init(struct drm_i915_private *i915)
 	struct drm_mode_config *mode_config = &i915->drm.mode_config;
 
 	drm_mode_config_init(&i915->drm);
-	INIT_LIST_HEAD(&i915->global_obj_list);
+	INIT_LIST_HEAD(&i915->display.global.obj_list);
 
 	mode_config->min_width = 0;
 	mode_config->min_height = 0;

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

@@ -344,6 +344,10 @@ struct intel_display {
 		u32 rx_config;
 	} fdi;
 
+	struct {
+		struct list_head obj_list;
+	} global;
+
 	struct {
 		/*
 		 * Base address of where the gmbus and gpio blocks are located

drivers/gpu/drm/i915/display/intel_global_state.c

@@ -45,14 +45,14 @@ void intel_atomic_global_obj_init(struct drm_i915_private *dev_priv,
 
 	obj->state = state;
 	obj->funcs = funcs;
-	list_add_tail(&obj->head, &dev_priv->global_obj_list);
+	list_add_tail(&obj->head, &dev_priv->display.global.obj_list);
 }
 
 void intel_atomic_global_obj_cleanup(struct drm_i915_private *dev_priv)
 {
 	struct intel_global_obj *obj, *next;
 
-	list_for_each_entry_safe(obj, next, &dev_priv->global_obj_list, head) {
+	list_for_each_entry_safe(obj, next, &dev_priv->display.global.obj_list, head) {
 		list_del(&obj->head);
 
 		drm_WARN_ON(&dev_priv->drm, kref_read(&obj->state->ref) != 1);

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

@@ -27,7 +27,7 @@ struct intel_global_obj {
 };
 
 #define intel_for_each_global_obj(obj, dev_priv) \
-	list_for_each_entry(obj, &(dev_priv)->global_obj_list, head)
+	list_for_each_entry(obj, &(dev_priv)->display.global.obj_list, head)
 
 #define for_each_new_global_obj_in_state(__state, obj, new_obj_state, __i) \
 	for ((__i) = 0; \

drivers/gpu/drm/i915/i915_drv.h

@@ -292,10 +292,6 @@ struct drm_i915_private {
 
 	struct i915_gem_mm mm;
 
-	/* Kernel Modesetting */
-
-	struct list_head global_obj_list;
-
 	bool mchbar_need_disable;
 
 	struct intel_l3_parity l3_parity;