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Message-ID: <58e11013-01ab-8a2c-732e-860ae83a3df6@suse.de>
Date: Thu, 23 Jun 2022 10:13:56 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Christian König <christian.koenig@....com>,
linux-media <linux-media@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linaro-mm-sig@...ts.linaro.org, lkml <linux-kernel@...r.kernel.org>
Cc: "Sharma, Shashank" <Shashank.Sharma@....com>
Subject: Re: DMA-buf and uncached system memory
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.
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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> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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