linux-kernel - Re: [Linaro-mm-sig] [PATCH 4/8] dma-buf: add peer2peer flag

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Message-ID: <20180425064335.GB28100@infradead.org>
Date:   Tue, 24 Apr 2018 23:43:35 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Christian König <christian.koenig@....com>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Jerome Glisse <jglisse@...hat.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>, Thierry Reding <treding@...dia.com>
Subject: Re: [Linaro-mm-sig] [PATCH 4/8] dma-buf: add peer2peer flag

On Wed, Apr 25, 2018 at 08:23:15AM +0200, Daniel Vetter wrote:
> For more fun:
> 
> https://www.spinics.net/lists/dri-devel/msg173630.html
> 
> Yeah, sometimes we want to disable the iommu because the on-gpu
> pagetables are faster ...

I am not on this list, but remote NAK from here.  This needs an
API from the iommu/dma-mapping code.  Drivers have no business poking
into these details.

Thierry, please resend this with at least the iommu list and
linux-arm-kernel in Cc to have a proper discussion on the right API.