nouveau_mem_map
ret = nouveau_mem_map(old_mem, vmm, &old_mem->vma[0]);
ret = nouveau_mem_map(new_mem, vmm, &old_mem->vma[1]);
int nouveau_mem_map(struct nouveau_mem *, struct nvif_vmm *, struct nvif_vma *);
ret = nouveau_mem_map(mem, &drm->client.vmm.vmm, &mem->vma[0]);
int ret = nouveau_mem_map(mem, &vma->vmm->vmm, &tmp);