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

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Message-ID: <BN9PR11MB52760B805DDD6CC70C0E1D6D8CB29@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 2 Mar 2023 09:37:30 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Jason Gunthorpe <jgg@...dia.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>
CC:     Robin Murphy <robin.murphy@....com>, Will Deacon <will@...nel.org>,
        "David Woodhouse" <dwmw2@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>
Subject: RE: [PATCH 1/4] iommu/vt-d: Implement set device pasid op for default
 domain

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> 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.