linux-kernel - Re: [PATCH] media: videobuf2-dma-sg: limit the sg segment size

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Message-ID: <20230830143341.GA25574@lst.de>
Date:   Wed, 30 Aug 2023 16:33:41 +0200
From:   Christoph Hellwig <hch@....de>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        Anle Pan <anle.pan@....com>, m.szyprowski@...sung.com,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, hui.fang@....com,
        Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH] media: videobuf2-dma-sg: limit the sg segment size

On Wed, Aug 30, 2023 at 12:47:57PM +0900, Tomasz Figa wrote:
> Do we see anything replacing it widely anywhere on the short-middle
> term horizon? I think we could possibly migrate vb2 to use that new
> thing internally and just provide some compatibility X to scatterlist
> conversion function for the drivers.

Jason said at LSF/MM that he had a prototype for a mapping API that
takes a phys/len array as input and dma_addr/len a output, which really
is the right thing to do, especially for dmabuf.

Jason, what's the status of your work?