XE_CACHE_WT
xe->pat.idx[XE_CACHE_WT] = 3; /* N/A (no display); use UC */
xe->pat.idx[XE_CACHE_WT] = 15;
xe->pat.idx[XE_CACHE_WT] = 1;
xe->pat.idx[XE_CACHE_WT] = 2;
xe->pat.idx[XE_CACHE_WT] = 2;
xe->pat.idx[XE_CACHE_WT] = 2;
drm_printf(p, "IDX[XE_CACHE_WT] = %d\n", xe->pat.idx[XE_CACHE_WT]);