linux-kernel - Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API

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Message-ID: <20240705060003.GB11885@lst.de>
Date: Fri, 5 Jul 2024 08:00:03 +0200
From: Christoph Hellwig <hch@....de>
To: Leon Romanovsky <leon@...nel.org>
Cc: Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	Jason Gunthorpe <jgg@...pe.ca>, Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Keith Busch <kbusch@...nel.org>, "Zeng, Oak" <oak.zeng@...el.com>,
	Chaitanya Kulkarni <kch@...dia.com>,
	Sagi Grimberg <sagi@...mberg.me>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org, iommu@...ts.linux.dev,
	linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
	kvm@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API

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.