[PATCH 1/3] drm/rcar-du: Import buffers with GEM DMA's helpers

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

Call __drm_gem_dma_create() to create an object for imported buffers,
instead of reimplementing the function within the driver. Reduces
code duplication and will later allow to un-export a number of symbols
from the GEM DMA helpers.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
 drivers/gpu/drm/drm_gem_dma_helper.c          |  5 +--
 drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c | 33 +++----------------
 include/drm/drm_gem_dma_helper.h              |  3 ++
 3 files changed, 10 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_dma_helper.c b/drivers/gpu/drm/drm_gem_dma_helper.c
index 870b90b78bc4e..e9aa3ac140654 100644
--- a/drivers/gpu/drm/drm_gem_dma_helper.c
+++ b/drivers/gpu/drm/drm_gem_dma_helper.c
@@ -67,8 +67,8 @@ static const struct drm_gem_object_funcs drm_gem_dma_default_funcs = {
  * A struct drm_gem_dma_object * on success or an ERR_PTR()-encoded negative
  * error code on failure.
  */
-static struct drm_gem_dma_object *
-__drm_gem_dma_create(struct drm_device *drm, size_t size, bool private)
+struct drm_gem_dma_object *__drm_gem_dma_create(struct drm_device *drm,
+						size_t size, bool private)
 {
 	struct drm_gem_dma_object *dma_obj;
 	struct drm_gem_object *gem_obj;
@@ -112,6 +112,7 @@ __drm_gem_dma_create(struct drm_device *drm, size_t size, bool private)
 	kfree(dma_obj);
 	return ERR_PTR(ret);
 }
+EXPORT_SYMBOL_GPL(__drm_gem_dma_create);
 
 /**
  * drm_gem_dma_create - allocate an object with the given size
diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
index adfb36b0e8154..ea7487e270f13 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c
@@ -356,49 +356,24 @@ const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
  * Frame buffer
  */
 
-static const struct drm_gem_object_funcs rcar_du_gem_funcs = {
-	.free = drm_gem_dma_object_free,
-	.print_info = drm_gem_dma_object_print_info,
-	.get_sg_table = drm_gem_dma_object_get_sg_table,
-	.vmap = drm_gem_dma_object_vmap,
-	.mmap = drm_gem_dma_object_mmap,
-	.vm_ops = &drm_gem_dma_vm_ops,
-};
-
 struct drm_gem_object *rcar_du_gem_prime_import_sg_table(struct drm_device *dev,
 				struct dma_buf_attachment *attach,
 				struct sg_table *sgt)
 {
 	struct rcar_du_device *rcdu = to_rcar_du_device(dev);
 	struct drm_gem_dma_object *dma_obj;
-	struct drm_gem_object *gem_obj;
-	int ret;
 
 	if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
 		return drm_gem_dma_prime_import_sg_table(dev, attach, sgt);
 
-	/* Create a DMA GEM buffer. */
-	dma_obj = kzalloc(sizeof(*dma_obj), GFP_KERNEL);
-	if (!dma_obj)
-		return ERR_PTR(-ENOMEM);
-
-	gem_obj = &dma_obj->base;
-	gem_obj->funcs = &rcar_du_gem_funcs;
-
-	drm_gem_private_object_init(dev, gem_obj, attach->dmabuf->size);
-	dma_obj->map_noncoherent = false;
-
-	ret = drm_gem_create_mmap_offset(gem_obj);
-	if (ret) {
-		drm_gem_object_release(gem_obj);
-		kfree(dma_obj);
-		return ERR_PTR(ret);
-	}
+	dma_obj = __drm_gem_dma_create(dev, attach->dmabuf->size, true);
+	if (IS_ERR(dma_obj))
+		return ERR_CAST(dma_obj);
 
 	dma_obj->dma_addr = 0;
 	dma_obj->sgt = sgt;
 
-	return gem_obj;
+	return &dma_obj->base;
 }
 
 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
diff --git a/include/drm/drm_gem_dma_helper.h b/include/drm/drm_gem_dma_helper.h
index 61da596780b64..3877cbf0e927c 100644
--- a/include/drm/drm_gem_dma_helper.h
+++ b/include/drm/drm_gem_dma_helper.h
@@ -32,6 +32,9 @@ struct drm_gem_dma_object {
 #define to_drm_gem_dma_obj(gem_obj) \
 	container_of(gem_obj, struct drm_gem_dma_object, base)
 
+struct drm_gem_dma_object *__drm_gem_dma_create(struct drm_device *drm,
+						size_t size, bool private);
+
 struct drm_gem_dma_object *drm_gem_dma_create(struct drm_device *drm,
 					      size_t size);
 void drm_gem_dma_free(struct drm_gem_dma_object *dma_obj);
-- 
2.41.0