arm_smmu_cb_readq
info->far = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_FAR);
info->ttbr0 = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_TTBR0);
phys = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_PAR);
cfi->iova = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_FAR);