kfd_doorbell_mmap 1918 drivers/gpu/drm/amd/amdkfd/kfd_chardev.c 		return kfd_doorbell_mmap(dev, process, vma);
kfd_doorbell_mmap  812 drivers/gpu/drm/amd/amdkfd/kfd_priv.h int kfd_doorbell_mmap(struct kfd_dev *dev, struct kfd_process *process,