linux-kernel - Re: [PATCH v6 01/11] iommu: Add dma ownership management interfaces

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Date:   Thu, 24 Feb 2022 13:16:51 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Robin Murphy <robin.murphy@....com>
Cc:     baolu.lu@...ux.intel.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>, rafael@...nel.org,
        Diana Craciun <diana.craciun@....nxp.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Li Yang <leoyang.li@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 01/11] iommu: Add dma ownership management interfaces

Hi Robin and Jason,

On 2/24/22 2:02 AM, Jason Gunthorpe wrote:
> On Wed, Feb 23, 2022 at 06:00:06PM +0000, Robin Murphy wrote:
> 
>> ...and equivalently just set owner_cnt directly to 0 here. I don't see a
>> realistic use-case for any driver to claim the same group more than once,
>> and allowing it in the API just feels like opening up various potential
>> corners for things to get out of sync.
> I am Ok if we toss it out to get this merged, as there is no in-kernel
> user right now.

So we don't need the owner pointer in the API anymore, right? As we will
only allow the claiming interface to be called only once, this token is
unnecessary.

Best regards,
baolu