drm/vgem: Introduce GEM object functions

GEM object functions deprecate several similar callback interfaces in
struct drm_driver. This patch replaces the per-driver callbacks with
per-instance callbacks in vgem. The only exception is gem_prime_mmap,
which is non-trivial to convert.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Melissa Wen <melissa.srw@gmail.com>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200923102159.24084-18-tzimmermann@suse.de

drivers/gpu/drm/vgem/vgem_drv.c

@@ -50,6 +50,8 @@
 #define DRIVER_MAJOR	1
 #define DRIVER_MINOR	0
 
+static const struct drm_gem_object_funcs vgem_gem_object_funcs;
+
 static struct vgem_device {
 	struct drm_device drm;
 	struct platform_device *platform;
@@ -167,6 +169,8 @@ static struct drm_vgem_gem_object *__vgem_gem_create(struct drm_device *dev,
 	if (!obj)
 		return ERR_PTR(-ENOMEM);
 
+	obj->base.funcs = &vgem_gem_object_funcs;
+
 	ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));
 	if (ret) {
 		kfree(obj);
@@ -401,12 +405,20 @@ static int vgem_prime_mmap(struct drm_gem_object *obj,
 	return 0;
 }
 
+static const struct drm_gem_object_funcs vgem_gem_object_funcs = {
+	.free = vgem_gem_free_object,
+	.pin = vgem_prime_pin,
+	.unpin = vgem_prime_unpin,
+	.get_sg_table = vgem_prime_get_sg_table,
+	.vmap = vgem_prime_vmap,
+	.vunmap = vgem_prime_vunmap,
+	.vm_ops = &vgem_gem_vm_ops,
+};
+
 static struct drm_driver vgem_driver = {
 	.driver_features		= DRIVER_GEM | DRIVER_RENDER,
 	.open				= vgem_open,
 	.postclose			= vgem_postclose,
-	.gem_free_object_unlocked	= vgem_gem_free_object,
-	.gem_vm_ops			= &vgem_gem_vm_ops,
 	.ioctls				= vgem_ioctls,
 	.num_ioctls 			= ARRAY_SIZE(vgem_ioctls),
 	.fops				= &vgem_driver_fops,
@@ -415,13 +427,8 @@ static struct drm_driver vgem_driver = {
 
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
-	.gem_prime_pin = vgem_prime_pin,
-	.gem_prime_unpin = vgem_prime_unpin,
 	.gem_prime_import = vgem_prime_import,
 	.gem_prime_import_sg_table = vgem_prime_import_sg_table,
-	.gem_prime_get_sg_table = vgem_prime_get_sg_table,
-	.gem_prime_vmap = vgem_prime_vmap,
-	.gem_prime_vunmap = vgem_prime_vunmap,
 	.gem_prime_mmap = vgem_prime_mmap,
 
 	.name	= DRIVER_NAME,