gp100_vmm_pde
if (pgt->pt[0] && !gp100_vmm_pde(pgt->pt[0], &data[0]))
if (pgt->pt[1] && !gp100_vmm_pde(pgt->pt[1], &data[1]))
if (!gp100_vmm_pde(pgt->pt[0], &data))