drm/rockchip: Convert to drm_gem_object_funcs

GEM object functions deprecate several similar callback interfaces in
struct drm_driver. This patch replaces the per-driver callbacks with
per-instance callbacks in rockchip. The only exception is gem_prime_mmap,
which is non-trivial to convert.

v3:
	* update documentation
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200923102159.24084-15-tzimmermann@suse.de

drivers/gpu/drm/rockchip/rockchip_drm_drv.c

@@ -212,15 +212,10 @@ static const struct file_operations rockchip_drm_driver_fops = {
 static struct drm_driver rockchip_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 	.lastclose		= drm_fb_helper_lastclose,
-	.gem_vm_ops		= &drm_gem_cma_vm_ops,
-	.gem_free_object_unlocked = rockchip_gem_free_object,
 	.dumb_create		= rockchip_gem_dumb_create,
 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
-	.gem_prime_get_sg_table	= rockchip_gem_prime_get_sg_table,
 	.gem_prime_import_sg_table	= rockchip_gem_prime_import_sg_table,
-	.gem_prime_vmap		= rockchip_gem_prime_vmap,
-	.gem_prime_vunmap	= rockchip_gem_prime_vunmap,
 	.gem_prime_mmap		= rockchip_gem_mmap_buf,
 	.fops			= &rockchip_drm_driver_fops,
 	.name	= DRIVER_NAME,

drivers/gpu/drm/rockchip/rockchip_drm_gem.c

@@ -296,6 +296,14 @@ static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
 	kfree(rk_obj);
 }
 
+static const struct drm_gem_object_funcs rockchip_gem_object_funcs = {
+	.free = rockchip_gem_free_object,
+	.get_sg_table = rockchip_gem_prime_get_sg_table,
+	.vmap = rockchip_gem_prime_vmap,
+	.vunmap	= rockchip_gem_prime_vunmap,
+	.vm_ops = &drm_gem_cma_vm_ops,
+};
+
 static struct rockchip_gem_object *
 	rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
 {
@@ -310,6 +318,8 @@ static struct rockchip_gem_object *
 
 	obj = &rk_obj->base;
 
+	obj->funcs = &rockchip_gem_object_funcs;
+
 	drm_gem_object_init(drm, obj, size);
 
 	return rk_obj;
@@ -338,7 +348,7 @@ rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 }
 
 /*
- * rockchip_gem_free_object - (struct drm_driver)->gem_free_object_unlocked
+ * rockchip_gem_free_object - (struct drm_gem_object_funcs)->free
  * callback function
  */
 void rockchip_gem_free_object(struct drm_gem_object *obj)