dynamic DMA-buf sharing between devices

[Chunming Zhou]

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.
>>>
>>>
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>