[Mesa-dev] [RFC] Linux Graphics Next: Explicit fences everywhere and no BO fences - initial proposal

Jason Ekstrand jason at jlekstrand.net
Tue Apr 27 20:49:24 UTC 2021

On Tue, Apr 27, 2021 at 1:38 PM Dave Airlie <airlied at gmail.com> wrote:
> On Tue, 27 Apr 2021 at 22:06, Christian König
> <ckoenig.leichtzumerken at gmail.com> wrote:
> >
> > Correct, we wouldn't have synchronization between device with and without user queues any more.
> >
> > That could only be a problem for A+I Laptops.
> Since I think you mentioned you'd only be enabling this on newer
> chipsets, won't it be a problem for A+A where one A is a generation
> behind the other?
> I'm not really liking where this is going btw, seems like a ill
> thought out concept, if AMD is really going down the road of designing
> hw that is currently Linux incompatible, you are going to have to
> accept a big part of the burden in bringing this support in to more
> than just amd drivers for upcoming generations of gpu.

In case my previous e-mail sounded too enthusiastic, I'm also pensive
about this direction.  I'm not sure I'm ready to totally give up on
all of Linux WSI just yet.  We definitely want to head towards memory
fences and direct submission but I'm not convinced that throwing out
all of interop is necessary.  It's certainly a very big hammer and we
should try to figure out something less destructive, if that's
possible.  (I don't know for sure that it is.)


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