drm/amdkfd: Don't assign dGPUs to APU topology devices

 *		the GPU device is not already present in the topology device

 *		list then return NULL. This means a new topology device has to

 *		be created for this GPU.

 * TODO: Rather than assiging @gpu to first topology device withtout

 *		gpu attached, it will better to have more stringent check.

 */

static struct kfd_topology_device *kfd_assign_gpu(struct kfd_dev *gpu)

{

	struct kfd_topology_device *out_dev = NULL;

	down_write(&topology_lock);

	list_for_each_entry(dev, &topology_device_list, list)

	list_for_each_entry(dev, &topology_device_list, list) {

		/* Discrete GPUs need their own topology device list

		 * entries. Don't assign them to CPU/APU nodes.

		 */

		if (!gpu->device_info->needs_iommu_device &&

		    dev->node_props.cpu_cores_count)

			continue;

		if (!dev->gpu && (dev->node_props.simd_count > 0)) {

			dev->gpu = gpu;

			out_dev = dev;

			break;

		}

	}

	up_write(&topology_lock);

	return out_dev;

}