linux-kernel - Re: [PATCH v3 5/6] media: uvcvideo: Use dma_alloc

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Message-ID: <20210111083614.GA27589@lst.de>
Date:   Mon, 11 Jan 2021 09:36:14 +0100
From:   ". Christoph Hellwig" <hch@....de>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     ". Christoph Hellwig" <hch@....de>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        IOMMU DRIVERS <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Sergey Senozhatsky <senozhatsky@...gle.com>
Subject: Re: [PATCH v3 5/6] media: uvcvideo: Use dma_alloc_noncontiguos API

On Thu, Jan 07, 2021 at 03:14:08PM +0100, Ricardo Ribalda wrote:
> > So I think we do want these branches for coherent vs non-coherent as they
> > have very different semantics and I do not think that hiding them under
> > the same API helps people to understand those vastly different semantics.
> >
> > OTOH we should look into a fallback for DMA API instances that do not
> > support the discontigous allocations.
> >
> > I think between your comments and those from Ricardo I have a good idea
> > for a somewhat updated API.  I'll try to post something in the next days.
> 
> Did you have time to look into this?
> 
> No hurry, I just want to make sure that I didn't miss anything ;)

Haven't managed to get to it, sorry.

> 
> Best regards!
> 
> 
> 
> -- 
> Ricardo Ribalda
---end quoted text---