netdev - Re: [Freedreno] [PATCH 16/17] iommu: remove DOMAIN_ATTR_IO_PGTABLE

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Message-ID: <20210310105550.GA29270@willie-the-truck>
Date:   Wed, 10 Mar 2021 10:55:51 +0000
From:   Will Deacon <will@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Rob Clark <robdclark@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, Li Yang <leoyang.li@....com>,
        kvm@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        virtualization@...ts.linux-foundation.org,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        netdev@...r.kernel.org,
        freedreno <freedreno@...ts.freedesktop.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Subject: Re: [Freedreno] [PATCH 16/17] iommu: remove
 DOMAIN_ATTR_IO_PGTABLE_CFG

On Wed, Mar 10, 2021 at 09:58:06AM +0100, Christoph Hellwig wrote:
> On Fri, Mar 05, 2021 at 10:00:12AM +0000, Will Deacon wrote:
> > > But one thing I'm not sure about is whether
> > > IO_PGTABLE_QUIRK_ARM_OUTER_WBWA is something that other devices
> > > *should* be using as well, but just haven't gotten around to yet.
> > 
> > The intention is certainly that this would be a place to collate per-domain
> > pgtable quirks, so I'd prefer not to tie that to the GPU.
> 
> So the overall consensus is to just keep this as-is for now?

Yes, please. If it doesn't see wider adoption then we can revisit it.

Will