amdiommu_find_unit
error = amdiommu_find_unit(dev, &unit, &rid1, &dte, &edte,
error = amdiommu_find_unit(dev, &unit, &rid, &dte, &edte, verbose);
error = amdiommu_find_unit(src, &unit, &rid, &dte, &edte,
int amdiommu_find_unit(device_t dev, struct amdiommu_unit **unitp,