Try to address the DMA-buf coherency problem

[Daniel Vetter]

On Wed, Nov 23, 2022 at 10:33:38AM +0200, Pekka Paalanen wrote:
> 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?

Hm yeah it would be great to land that and then eventually extend. Daniel?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch