linux-kernel - Re: dynamic DMA-buf sharing between devices

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Message-ID: <b19612a3-0143-f8b5-7758-7e80c46d33d4@amd.com>
Date:   Wed, 17 Apr 2019 13:52:06 +0000
From:   Chunming Zhou <zhoucm1@....com>
To:     Christian König 
        <ckoenig.leichtzumerken@...il.com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>
Subject: Re: dynamic DMA-buf sharing between devices

Thanks Christian, great job. I will verify it this week when I finish my 
current work on hand.

-David

在 2019/4/17 2:38, Christian König wrote:
> Hi everybody,
>
> core idea in this patch set is that DMA-buf importers can now provide an optional invalidate callback. Using this callback and the reservation object exporters can now avoid pinning DMA-buf memory for a long time while sharing it between devices.
>
> I've already send out an older version roughly a year ago, but didn't had time to further look into cleaning this up.
>
> The last time a major problem was that we would had to fix up all drivers implementing DMA-buf at once.
>
> Now I avoid this by allowing mappings to be cached in the DMA-buf attachment and so driver can optionally move over to the new interface one by one.
>
> This is also a prerequisite to my patchset enabling sharing of device memory with DMA-buf.
>
> Please review and/or comment,
> Christian.
>
>
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