linux-kernel - Re: [RFC PATCH 4/5] iommu/dma: Export non-static functions to use in modules

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Message-ID: <20170706141045.GA577@lst.de>
Date:   Thu, 6 Jul 2017 16:10:45 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Tomasz Figa <tfiga@...omium.org>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Will Deacon <will.deacon@....com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Hans-Christian Noren Egtvedt <egtvedt@...fundet.no>,
        Mitchel Humpherys <mitchelh@...eaurora.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC PATCH 4/5] iommu/dma: Export non-static functions to use
        in modules

On Thu, Jul 06, 2017 at 12:09:45PM +0100, Robin Murphy wrote:
> I suppose another option is to just make the IOMMU and DMA ops a
> self-contained non-modular driver mirroring the VT-d/AMD-Vi IOMMUs -
> AFAICS it shouldn't have to be all that tightly coupled to the IPU bus
> code, the latter more or less just needs to create the appropriate IOMMU
> device for the driver to find.

I still haven't seen the driver code, but this seems to be best
solution so far.  Given that it's not a plug in device but part of
an SOC that seems perfectly acceptable to me.