linux-kernel - Re: [PATCH 3/4] dma-buf: add support for mapping with dma mapping attributes

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Date:   Mon, 21 Jan 2019 14:14:48 -0800 (PST)
From:   Liam Mark <lmark@...eaurora.org>
To:     Christoph Hellwig <hch@...radead.org>
cc:     "Andrew F. Davis" <afd@...com>, Laura Abbott <labbott@...hat.com>,
        sumit.semwal@...aro.org, arve@...roid.com, tkjos@...roid.com,
        maco@...roid.com, joel@...lfernandes.org, christian@...uner.io,
        devel@...verdev.osuosl.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        john.stultz@...aro.org
Subject: Re: [PATCH 3/4] dma-buf: add support for mapping with dma mapping
 attributes

On Mon, 21 Jan 2019, Christoph Hellwig wrote:

> On Mon, Jan 21, 2019 at 12:20:42PM -0800, Liam Mark wrote:
> > I have left this to clients, but if they own the buffer they can have the 
> > knowledge as to whether CPU access is needed in that use case (example for 
> > post-processing).
> 
> That is an API design which the user is more likely to get wrong than
> right and thus does not pass the smell test.
> 

With the previous version of ION Android ION clients were successfully 
managing all their cache maintenance.



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