linux-kernel - Re: [PATCH v5 1/7] iommu: Generalize default PCIe requester ID PASID

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Date:   Tue, 9 May 2023 13:39:40 -0700
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>,
        Robin Murphy <robin.murphy@....com>,
        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>,
        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>,
        "Ranganathan, Narayan" <narayan.ranganathan@...el.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v5 1/7] iommu: Generalize default PCIe requester ID
 PASID

Hi Kevin,

On Fri, 5 May 2023 08:28:13 +0000, "Tian, Kevin" <kevin.tian@...el.com>
wrote:

> > > >
> > > > By having a common RID_PASID, we can avoid conflicts between
> > > > different use cases in the generic code. e.g. SVA and DMA API with
> > > > PASIDs.  
> > >
> > > You intend it to be generic but in the end only vt-d driver is changed
> > > to use it in this series...  
> > change for SVA is in the patch.  
> 
> My point was that since it is common why there is no change in arm-smmu
> driver to use the common macro?
Got it, I will include changes to SSID 0 in smmu code.

Thanks,

Jacob