linux-kernel - Re: [PATCH v6 03/12] iommu: Add attach/detach_dev

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Message-ID: <20220512115101.GU49344@nvidia.com>
Date:   Thu, 12 May 2022 08:51:01 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Baolu Lu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        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>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        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 v6 03/12] iommu: Add attach/detach_dev_pasid domain ops

On Thu, May 12, 2022 at 08:00:59AM +0100, Jean-Philippe Brucker wrote:

> > It is not "missing" it is just renamed to blocking_domain->ops->set_dev_pasid()
> > 
> > The implementation of that function would be identical to
> > detach_dev_pasid.
> 
>   attach(dev, pasid, sva_domain)
>   detach(dev, pasid, sva_domain)
> 
> versus
> 
>   set_dev_pasid(dev, pasid, sva_domain)
>   set_dev_pasid(dev, pasid, blocking)
> 
> we loose the information of the domain previously attached, and the SMMU
> driver has to retrieve it to find the ASID corresponding to the mm. 

It would be easy to have the old domain be an input as well - the core
code knows it.

Jason