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

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Date:   Thu, 2 Mar 2023 11:25:17 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     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>,
        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>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH 1/4] iommu/vt-d: Implement set device pasid op for
 default domain

Hi Kevin,

On Thu, 2 Mar 2023 09:37:30 +0000, "Tian, Kevin" <kevin.tian@...el.com>
wrote:

> > 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.
yes, it is a little tricky in that enabling PASID should be done before ATS
but for now anything uses ENQCMDS should support ATS. I will add
	/*
	 * PASID should be enabled as part of PCI caps enabling where
	 * ordering is required relative to ATS.
	 */
	if (WARN_ON(!pdev->pasid_enabled))
		return -ENODEV;

Thanks,

Jacob