linux-kernel - Re: DMA-buf and uncached system memory

Open Source and information security mailing list archives

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.
> _______________________________________________
> dri-devel mailing list
> 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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