nvkm_vmm_ptes_sparse
nvkm_vmm_ptes_sparse(vmm, vma->addr, vma->size, false);
ret = nvkm_vmm_ptes_sparse(vmm, vma->addr, vma->size, true);
ret = nvkm_vmm_ptes_sparse(vmm, addr, size, ref);
nvkm_vmm_ptes_sparse(vmm, start, size, false);