DMAR_CAP_CM
if ((dmar->hw_cap & DMAR_CAP_CM) == 0 && !force)
if ((unit->hw_cap & DMAR_CAP_CM) != 0)
if ((unit->hw_cap & DMAR_CAP_CM) != 0)
if (!DMAR_HAS_QI(unit) || (unit->hw_cap & DMAR_CAP_CM) != 0)