linux-kernel - Re: add a new dma_alloc_noncontiguous API v3

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Message-ID: <CANiDSCuFkTYMGeL8WK_3VkYy4a1h3hY4NKWTtz=bho844Fa2zw@mail.gmail.com>
Date:   Thu, 11 Mar 2021 17:57:56 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Sergey Senozhatsky <senozhatsky@...gle.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Robin Murphy <robin.murphy@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>
Subject: Re: add a new dma_alloc_noncontiguous API v3

Hi Christoph

I tried to run it in an arm device and it worked fine.

On Thu, Mar 11, 2021 at 5:52 PM Christoph Hellwig <hch@....de> wrote:
>
> Any comments?  Especially on the uvcvideo conversion?
>
> On Mon, Mar 01, 2021 at 09:52:30AM +0100, Christoph Hellwig wrote:
> > Hi all,
> >
> > this series adds the new noncontiguous DMA allocation API requested by
> > various media driver maintainers.
> >
> > Changes since v2:
> >  - rebased to Linux 5.12-rc1
> >  - dropped one already merged patch
> >  - pass an attrs argument to dma_alloc_noncontigous
> >  - clarify the dma_vmap_noncontiguous documentation a bit
> >  - fix double assignments in uvcvideo
> >
> > Changes since v1:
> >  - document that flush_kernel_vmap_range and invalidate_kernel_vmap_range
> >    must be called once an allocation is mapped into KVA
> >  - add dma-debug support
> >  - remove the separate dma_handle argument, and instead create fully formed
> >    DMA mapped scatterlists
> >  - use a directional allocation in uvcvideo
> >  - call invalidate_kernel_vmap_range from uvcvideo
> > _______________________________________________
> > iommu mailing list
> > iommu@...ts.linux-foundation.org
> > https://lists.linuxfoundation.org/mailman/listinfo/iommu
> ---end quoted text---

-- 
Ricardo Ribalda

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