> 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.
