linux-kernel - Re: [PATCH v3 fpga 4/4] fpga zynq: Use the scatterlist interface

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Message-ID: <CAAtXAHeaO-854jY1_9hOgudgLMhmD6sOHmvh23EcDKg92iB2pg@mail.gmail.com>
Date:   Sat, 28 Jan 2017 11:33:31 +0100
From:   Moritz Fischer <moritz.fischer@...us.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     Alan Tull <atull@...nsource.altera.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH v3 fpga 4/4] fpga zynq: Use the scatterlist interface

Hi Jason,

On Fri, Jan 6, 2017 at 10:14 PM, Jason Gunthorpe
<jgunthorpe@...idianresearch.com> wrote:
> This allows the driver to avoid a high order coherent DMA allocation
> and memory copy. With this patch it can DMA directly from the kernel
> pages that the bitfile is stored in.
>
> Since this is now a gather DMA operation the driver uses the ISR
> to feed the chips DMA queue with each entry from the SGL.
>
> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Acked-by: Moritz Fischer <moritz.fischer@...us.com>

Thanks,

Moritz