RE: [PATCH 1/4] iommu/vt-d: Implement set device pasid op for default domain

[Tian, Kevin]

> From: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
> Sent: Thursday, March 2, 2023 9:00 AM
> 
> @@ -4675,6 +4679,33 @@ static void
> intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
>  	intel_pasid_tear_down_entry(iommu, dev, pasid, false);
>  }
> 
> +static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
> +				   struct device *dev, ioasid_t pasid)
> +{
> +	struct device_domain_info *info = dev_iommu_priv_get(dev);
> +	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> +	struct intel_iommu *iommu = info->iommu;
> +	int ret = 0;
> +
> +	if (!sm_supported(iommu) || !info)
> +		return -ENODEV;
> +
> +	if (WARN_ON(pasid == PASID_RID2PASID))
> +		return -EINVAL;
> +
> +	if (hw_pass_through && domain_type_is_si(dmar_domain))
> +		ret = intel_pasid_setup_pass_through(iommu, dmar_domain,
> +						     dev, pasid);
> +	else if (dmar_domain->use_first_level)
> +		ret = domain_setup_first_level(iommu, dmar_domain,
> +					       dev, pasid);
> +	else
> +		ret = intel_pasid_setup_second_level(iommu, dmar_domain,
> +						     dev, pasid);
> +

check whether pasid capability has been enabled on this device.

it's unlike SVA which has separate capability to tell.