[RFC PATCH v1 00/18] Provide a new two step DMA API mapping API

[Christoph Hellwig]

On Thu, Jul 04, 2024 at 04:18:39PM +0300, Leon Romanovsky wrote:
> > 2) The amount of seemingly unrelated global headers pulled into other
> > global headers.  Some of this might just be sloppiness, e.g. I can't
> > see why dma-mapping.h would actually need iommu.h to start with,
> > but pci.h in dma-map-ops.h is a no-go.
> 
> pci.h was pulled because I needed to call to pci_p2pdma_map_type()
> in dma_can_use_iova().

No, that's not the reason.  The reason is actually that whole
dev_use_swiotlb mess which shouldn't exist in this form.