linux-kernel - Re: [PATCH v6 5/8] iommu: Add bounce page APIs

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Date:   Fri, 16 Aug 2019 06:46:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@....de>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, alan.cox@...el.com, kevin.tian@...el.com,
        mika.westerberg@...ux.intel.com, Ingo Molnar <mingo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        pengfei.xu@...el.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Jonathan Corbet <corbet@....net>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Alan Cox <alan@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...el.com>
Subject: Re: [PATCH v6 5/8] iommu: Add bounce page APIs

On Fri, Aug 16, 2019 at 10:45:13AM +0800, Lu Baolu wrote:
> Okay. I understand that adding these APIs in iommu.c is not a good idea.
> And, I also don't think merging the bounce buffer implementation into
> iommu_map() is feasible since iommu_map() is not DMA API centric.
>
> The bounce buffer implementation will eventually be part of DMA APIs
> defined in dma-iommu.c, but currently those APIs are not ready for x86
> use yet. So I will put them in iommu/vt-d driver for this time being and
> will move them to dma-iommu.c later.

I think they are more or less ready actually, we just need more people
reviewing the conversions.  Tom just reposted the AMD one which will need
a few more reviews, and he has an older patchset for intel-iommu as well
that could use a some more eyes.