Try to address the DMA-buf coherency problem

[Pekka Paalanen]

On Tue, 22 Nov 2022 18:33:59 +0100
Christian König <christian.koenig at amd.com> wrote:

> We should have come up with dma-heaps earlier and make it clear that 
> exporting a DMA-buf from a device gives you something device specific 
> which might or might not work with others.
> 
> Apart from that I agree, DMA-buf should be capable of handling this. 
> Question left is what documentation is missing to make it clear how 
> things are supposed to work?

Perhaps somewhat related from Daniel Stone that seems to have been
forgotten:
https://lore.kernel.org/dri-devel/20210905122742.86029-1-daniels@collabora.com/

It aimed mostly at userspace, but sounds to me like the coherency stuff
could use a section of its own there?


Thanks,
pq
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