linux-kernel - Re: [PATCH v5 3/7] iommu: Allow the dma-iommu api to use bounce buffers

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Date:   Mon, 23 Nov 2020 11:47:06 +0000
From:   Will Deacon <will@...nel.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Joerg Roedel <joro@...tes.org>, Tom Murphy <murphyt7@....ie>,
        David Woodhouse <dwmw2@...radead.org>,
        Ashok Raj <ashok.raj@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Logan Gunthorpe <logang@...tatee.com>
Subject: Re: [PATCH v5 3/7] iommu: Allow the dma-iommu api to use bounce
 buffers

On Mon, Nov 23, 2020 at 07:40:57PM +0800, Lu Baolu wrote:
> On 2020/11/23 18:08, Christoph Hellwig wrote:
> > > +	/*
> > > +	 * If both the physical buffer start address and size are
> > > +	 * page aligned, we don't need to use a bounce page.
> > > +	 */
> > > +	if (IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev) &&
> > > +	    iova_offset(iovad, phys | org_size)) {
> > > +		aligned_size = iova_align(iovad, org_size);
> > > +		phys = swiotlb_tbl_map_single(dev,
> > > +				phys_to_dma(dev, io_tlb_start),
> > > +				phys, org_size, aligned_size, dir, attrs);
> > 
> > swiotlb_tbl_map_single takes one less argument in 5.10-rc now.
> > 
> 
> Yes. But Will's iommu/next branch is based on 5.10-rc3. I synced with
> him, we agreed to keep it 5.10-rc3 and resolve this conflict when
> merging it.

That's right, although I failed to appreciate the conflict was due to a
change in function prototype rather than just a context collision. So
I've updated the vt-d branch to contain the stuff fron Konrad:

https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/iommu/vt-d

Sorry for messing you around!

Will