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

Open Source and information security mailing list archives

Message-ID: <04558379-9788-bbcc-5c64-7fa9ad92f60d@gmail.com>
Date:   Wed, 17 Apr 2019 15:59:51 +0200
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     Chunming Zhou <zhoucm1@....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

On top of those I have 6 more patches in the pipeline to enable VRAM P2P 
with DMA-buf.

So that is not the end of the patch set :)

Christian.

Am 17.04.19 um 15:52 schrieb Chunming Zhou:
> 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.
>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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