diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 9ab038c8dd5f004db13718c8c5f3f86e7da87bb6..a8ba7da83d45819ccf45dbe5a0170cdc79c9eecf 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -317,24 +317,44 @@ drm_gem_free_mmap_offset(struct drm_gem_object *obj)
 EXPORT_SYMBOL(drm_gem_free_mmap_offset);
 
 /**
- * drm_gem_create_mmap_offset - create a fake mmap offset for an object
+ * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
  * @obj: obj in question
+ * @size: the virtual size
  *
  * GEM memory mapping works by handing back to userspace a fake mmap offset
  * it can use in a subsequent mmap(2) call.  The DRM core code then looks
  * up the object based on the offset and sets up the various memory mapping
  * structures.
  *
- * This routine allocates and attaches a fake offset for @obj.
+ * This routine allocates and attaches a fake offset for @obj, in cases where
+ * the virtual size differs from the physical size (ie. obj->size).  Otherwise
+ * just use drm_gem_create_mmap_offset().
  */
 int
-drm_gem_create_mmap_offset(struct drm_gem_object *obj)
+drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)
 {
 	struct drm_device *dev = obj->dev;
 	struct drm_gem_mm *mm = dev->mm_private;
 
 	return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node,
-				  obj->size / PAGE_SIZE);
+				  size / PAGE_SIZE);
+}
+EXPORT_SYMBOL(drm_gem_create_mmap_offset_size);
+
+/**
+ * drm_gem_create_mmap_offset - create a fake mmap offset for an object
+ * @obj: obj in question
+ *
+ * GEM memory mapping works by handing back to userspace a fake mmap offset
+ * it can use in a subsequent mmap(2) call.  The DRM core code then looks
+ * up the object based on the offset and sets up the various memory mapping
+ * structures.
+ *
+ * This routine allocates and attaches a fake offset for @obj.
+ */
+int drm_gem_create_mmap_offset(struct drm_gem_object *obj)
+{
+	return drm_gem_create_mmap_offset_size(obj, obj->size);
 }
 EXPORT_SYMBOL(drm_gem_create_mmap_offset);
 
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 6a0918e7db653e124b9eedfdce20a7ed7b227e02..d6d9a28fc6b4226e4ba83c6a739c737764ac27ef 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1614,6 +1614,7 @@ drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
 
 void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
 int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
+int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
 
 struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
 					     struct drm_file *filp,