drm/i915: Add macros to get i915 device from i915_gem_object

We want to stop touching directly i915_gem_object struct members in
intel_frontbuffer code. As a part of this we add helper macro to get i915
device from i915_gem_object.

v2: operate on and return pointer in defined macros
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230727064142.751976-2-jouni.hogander@intel.com

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

@@ -167,7 +167,7 @@ void __intel_fb_invalidate(struct intel_frontbuffer *front,
 			   enum fb_op_origin origin,
 			   unsigned int frontbuffer_bits)
 {
-	struct drm_i915_private *i915 = to_i915(front->obj->base.dev);
+	struct drm_i915_private *i915 = intel_bo_to_i915(front->obj);
 
 	if (origin == ORIGIN_CS) {
 		spin_lock(&i915->display.fb_tracking.lock);
@@ -188,7 +188,7 @@ void __intel_fb_flush(struct intel_frontbuffer *front,
 		      enum fb_op_origin origin,
 		      unsigned int frontbuffer_bits)
 {
-	struct drm_i915_private *i915 = to_i915(front->obj->base.dev);
+	struct drm_i915_private *i915 = intel_bo_to_i915(front->obj);
 
 	if (origin == ORIGIN_CS) {
 		spin_lock(&i915->display.fb_tracking.lock);
@@ -221,14 +221,14 @@ static void frontbuffer_retire(struct i915_active *ref)
 }
 
 static void frontbuffer_release(struct kref *ref)
-	__releases(&to_i915(front->obj->base.dev)->display.fb_tracking.lock)
+	__releases(&intel_bo_to_i915(front->obj)->display.fb_tracking.lock)
 {
 	struct intel_frontbuffer *front =
 		container_of(ref, typeof(*front), ref);
 	struct drm_i915_gem_object *obj = front->obj;
 	struct i915_vma *vma;
 
-	drm_WARN_ON(obj->base.dev, atomic_read(&front->bits));
+	drm_WARN_ON(&intel_bo_to_i915(obj)->drm, atomic_read(&front->bits));
 
 	spin_lock(&obj->vma.lock);
 	for_each_ggtt_vma(vma, obj) {
@@ -238,7 +238,7 @@ static void frontbuffer_release(struct kref *ref)
 	spin_unlock(&obj->vma.lock);
 
 	RCU_INIT_POINTER(obj->frontbuffer, NULL);
-	spin_unlock(&to_i915(obj->base.dev)->display.fb_tracking.lock);
+	spin_unlock(&intel_bo_to_i915(obj)->display.fb_tracking.lock);
 
 	i915_active_fini(&front->write);
 
@@ -249,7 +249,7 @@ static void frontbuffer_release(struct kref *ref)
 struct intel_frontbuffer *
 intel_frontbuffer_get(struct drm_i915_gem_object *obj)
 {
-	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct drm_i915_private *i915 = intel_bo_to_i915(obj);
 	struct intel_frontbuffer *front;
 
 	front = __intel_frontbuffer_get(obj);
@@ -286,7 +286,7 @@ void intel_frontbuffer_put(struct intel_frontbuffer *front)
 {
 	kref_put_lock(&front->ref,
 		      frontbuffer_release,
-		      &to_i915(front->obj->base.dev)->display.fb_tracking.lock);
+		      &intel_bo_to_i915(front->obj)->display.fb_tracking.lock);
 }
 
 /**
@@ -315,13 +315,13 @@ void intel_frontbuffer_track(struct intel_frontbuffer *old,
 	BUILD_BUG_ON(I915_MAX_PLANES > INTEL_FRONTBUFFER_BITS_PER_PIPE);
 
 	if (old) {
-		drm_WARN_ON(old->obj->base.dev,
+		drm_WARN_ON(&intel_bo_to_i915(old->obj)->drm,
 			    !(atomic_read(&old->bits) & frontbuffer_bits));
 		atomic_andnot(frontbuffer_bits, &old->bits);
 	}
 
 	if (new) {
-		drm_WARN_ON(new->obj->base.dev,
+		drm_WARN_ON(&intel_bo_to_i915(new->obj)->drm,
 			    atomic_read(&new->bits) & frontbuffer_bits);
 		atomic_or(frontbuffer_bits, &new->bits);
 	}

drivers/gpu/drm/i915/gem/i915_gem_object_types.h

@@ -718,6 +718,9 @@ struct drm_i915_gem_object {
 	};
 };
 
+#define intel_bo_to_drm_bo(bo) (&(bo)->base)
+#define intel_bo_to_i915(bo) to_i915(intel_bo_to_drm_bo(bo)->dev)
+
 static inline struct drm_i915_gem_object *
 to_intel_bo(struct drm_gem_object *gem)
 {