linux-kernel - Re: your mail

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Date:   Fri, 31 Aug 2018 13:23:49 -0700
From:   Paul Burton <paul.burton@...s.com>
To:     Christoph Hellwig <hch@....de>
Cc:     iommu@...ts.linux-foundation.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: your mail

Hi Christoph,

On Mon, Aug 27, 2018 at 04:50:27PM +0200, Christoph Hellwig wrote:
> Subject: [RFC] merge dma_direct_ops and dma_noncoherent_ops
> 
> While most architectures are either always or never dma coherent for a
> given build, the arm, arm64, mips and soon arc architectures can have
> different dma coherent settings on a per-device basis.  Additionally
> some mips builds can decide at boot time if dma is coherent or not.
> 
> I've started to look into handling noncoherent dma in swiotlb, and
> moving the dma-iommu ops into common code [1], and for that we need a
> generic way to check if a given device is coherent or not.  Moving
> this flag into struct device also simplifies the conditionally coherent
> architecture implementations.
> 
> These patches are also available in a git tree given that they have
> a few previous posted dependencies:
> 
>     git://git.infradead.org/users/hch/misc.git dma-direct-noncoherent-merge
> 
> Gitweb:
> 
>     http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-direct-noncoherent-merge

Apart from the nits in patch 2, these look sane to me from a MIPS
perspective, so for patches 1-4:

    Acked-by: Paul Burton <paul.burton@...s.com> # MIPS parts

Thanks,
    Paul