Re: DMA-buf and uncached system memory

[Christian König]

Am 23.06.22 um 10:13 schrieb Thomas Zimmermann:
> Hi Christian
>
> Am 15.02.21 um 09:58 schrieb Christian König:
> > Hi guys,
> >
> > we are currently working an Freesync and direct scan out from system 
> > memory on AMD APUs in A+A laptops.
> >
> > On problem we stumbled over is that our display hardware needs to 
> > scan out from uncached system memory and we currently don't have a 
> > way to communicate that through DMA-buf.
> >
> > For our specific use case at hand we are going to implement something 
> > driver specific, but the question is should we have something more 
> > generic for this?
>
> I had a patchset here that extends iosys-map (former dma-buf-map) with 
> caching information. I'll post a copy.

Oh, nice. But why on iosys-map? We need that per DMA-buf.

Thanks,
Christian.

> Sorry for being late to reply.
>
> Best regards
> Thomas
>
> > After all the system memory access pattern is a PCIe extension and as 
> > such something generic.
> >
> > Regards,
> > Christian.
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