[PATCH v15 05/19] drm/etnaviv: Add contructor and destructor for etnaviv_gem_get_mapping structure

[Sui Jingfeng]

Because this make the code more easier to understand, When GPU access the
VRAM, it will allocate a new mapping to use if there don't have one.

Signed-off-by: Sui Jingfeng <sui.jingfeng at linux.dev>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c | 40 +++++++++++++++++++--------
 drivers/gpu/drm/etnaviv/etnaviv_gem.h |  6 ++++
 2 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 85d4e7c87a6a..55004fa9fabd 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -227,6 +227,30 @@ etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 	return NULL;
 }
 
+static struct etnaviv_vram_mapping *
+etnaviv_gem_vram_mapping_new(struct etnaviv_gem_object *etnaviv_obj)
+{
+	struct etnaviv_vram_mapping *mapping;
+
+	mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+	if (!mapping)
+		return NULL;
+
+	INIT_LIST_HEAD(&mapping->scan_node);
+	mapping->object = etnaviv_obj;
+	mapping->use = 1;
+
+	list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
+
+	return mapping;
+}
+
+static void etnaviv_gem_vram_mapping_destroy(struct etnaviv_vram_mapping *mapping)
+{
+	list_del(&mapping->obj_node);
+	kfree(mapping);
+}
+
 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 {
 	struct etnaviv_gem_object *etnaviv_obj = mapping->object;
@@ -289,27 +313,20 @@ struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 	 */
 	mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 	if (!mapping) {
-		mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+		mapping = etnaviv_gem_vram_mapping_new(etnaviv_obj);
 		if (!mapping) {
 			ret = -ENOMEM;
 			goto out;
 		}
-
-		INIT_LIST_HEAD(&mapping->scan_node);
-		mapping->object = etnaviv_obj;
 	} else {
-		list_del(&mapping->obj_node);
+		mapping->use = 1;
 	}
 
-	mapping->use = 1;
-
 	ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
 				    mmu_context->global->memory_base,
 				    mapping, va);
 	if (ret < 0)
-		kfree(mapping);
-	else
-		list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
+		etnaviv_gem_vram_mapping_destroy(mapping);
 
 out:
 	mutex_unlock(&etnaviv_obj->lock);
@@ -544,8 +561,7 @@ void etnaviv_gem_free_object(struct drm_gem_object *obj)
 		if (context)
 			etnaviv_iommu_unmap_gem(context, mapping);
 
-		list_del(&mapping->obj_node);
-		kfree(mapping);
+		etnaviv_gem_vram_mapping_destroy(mapping);
 	}
 
 	etnaviv_obj->ops->vunmap(etnaviv_obj);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.h b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
index d4965de3007c..f2ac64d8e90b 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
@@ -31,6 +31,12 @@ struct etnaviv_vram_mapping {
 	u32 iova;
 };
 
+static inline struct etnaviv_vram_mapping *
+to_etnaviv_vram_mapping(struct drm_mm_node *vram)
+{
+	return container_of(vram, struct etnaviv_vram_mapping, vram_node);
+}
+
 struct etnaviv_gem_object {
 	struct drm_gem_object base;
 	const struct etnaviv_gem_ops *ops;
-- 
2.43.0