linux-kernel - RE: [PATCH RFC 01/11] iommu: Add pasid_bits field in struct dev

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Message-ID: <BN9PR11MB5276981B9328F10E5FC89B728C179@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 22 Mar 2022 00:26:38 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
CC:     Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RFC 01/11] iommu: Add pasid_bits field in struct dev_iommu

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, March 21, 2022 6:22 PM
> >> -				if (features >= 0)
> >> +				if (features >= 0) {
> >>   					info->pasid_supported = features | 1;
> >> +					dev->iommu->pasid_bits =
> >> +						fls(pci_max_pasids(pdev)) - 1;
> > Original intel_svm_alloc_pasid() covers both PCI and non-PCI devices:
> >
> > 	ioasid_t max_pasid = dev_is_pci(dev) ?
> > 		pci_max_pasids(to_pci_dev(dev)) : intel_pasid_max_id;
> >
> > though I'm not sure whether non-PCI SVA has been supported indeed, this
> > patch implies a functional change here.
> >
> 
> The info->pasid_supported is only set for PCI devices. So the status is
> that non-PCI SVA hasn't been supported. No functional change here from
> this point of view.
> 

Then this information should be included in the commit msg.