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

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Message-ID: <5457e417-f710-5e81-fc9b-c78378af49e6@amd.com>
Date:   Wed, 17 Apr 2019 14:14:20 +0000
From:   Chunming Zhou <zhoucm1@....com>
To:     "Koenig, Christian" <Christian.Koenig@....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

I like you do somethings step by step, you can ping me when they are ready.

-David

在 2019/4/17 21:59, Christian König 写道:
> 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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