HVS_UBM_WORD_SIZE
drm_mm_init(&hvs->upm_mm, 0, 1024 * HVS_UBM_WORD_SIZE);
upm_size, HVS_UBM_WORD_SIZE,
VC4_SET_FIELD(refcount->upm.start / HVS_UBM_WORD_SIZE,
return ALIGN(buffer_size, HVS_UBM_WORD_SIZE);