linux-kernel - RE: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

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Date:   Wed, 1 Jun 2022 10:05:02 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
CC:     Jason Gunthorpe <jgg@...dia.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.com>,
        Christoph Hellwig <hch@...radead.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "will@...nel.org" <will@...nel.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Eric Auger <eric.auger@...hat.com>
Subject: RE: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

> From: Baolu Lu <baolu.lu@...ux.intel.com>
> Sent: Wednesday, June 1, 2022 5:37 PM
> 
> On 2022/6/1 09:43, Tian, Kevin wrote:
> >> From: Jacob Pan<jacob.jun.pan@...ux.intel.com>
> >> Sent: Wednesday, June 1, 2022 1:30 AM
> >>>> In both cases the pasid is stored in the attach data instead of the
> >>>> domain.
> >>>>
> >> So during IOTLB flush for the domain, do we loop through the attach data?
> > Yes and it's required.
> 
> What does the attach data mean here? Do you mean group->pasid_array?

any structure describing the attaching relationship from {device, pasid} to
a domain

> 
> Why not tracking the {device, pasid} info in the iommu driver when
> setting domain to {device, pasid}? We have tracked device in a list when
> setting a domain to device.
> 

Yes, that tracking structure is the attach data. 😊