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

[Lu Baolu]

Hi Christoph,

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.

Best regards,
baolu