Re: [PATCH v2 01/10] iommu/arm-smmu-v3: Store IOTLB cache tags in struct arm_smmu_attach_state

[Jason Gunthorpe]

On Wed, Jan 21, 2026 at 05:24:19PM -0800, Nicolin Chen wrote:
> +int arm_smmu_domain_get_iotlb_tag(struct arm_smmu_domain *smmu_domain,
> +				  struct arm_smmu_device *smmu,
> +				  struct arm_smmu_inv *tag)
> +{
> +	/* Decide the type of the iotlb cache tag */
> +	switch (smmu_domain->stage) {
> +	case ARM_SMMU_DOMAIN_SVA:
> +	case ARM_SMMU_DOMAIN_S1:
> +		tag->type = INV_TYPE_S1_ASID;
> +		break;
> +	case ARM_SMMU_DOMAIN_S2:
> +		tag->type = INV_TYPE_S2_VMID;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	tag->smmu = smmu;
> +
> +	if (tag->type == INV_TYPE_S1_ASID)
> +		tag->id = smmu_domain->cd.asid;
> +	else
> +		tag->id = smmu_domain->s2_cfg.vmid;

Would be tidier to move these up into the case

Otherwise looks OK

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason