linux-kernel - Re: [PATCH 2/2] dma: Add IOMMU static calls with clear default ops

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Message-ID: <20240712044937.GA4709@lst.de>
Date: Fri, 12 Jul 2024 06:49:37 +0200
From: Christoph Hellwig <hch@....de>
To: Robin Murphy <robin.murphy@....com>
Cc: Leon Romanovsky <leon@...nel.org>, Christoph Hellwig <hch@....de>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>, linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: Re: [PATCH 2/2] dma: Add IOMMU static calls with clear default ops

On Thu, Jul 11, 2024 at 07:23:20PM +0100, Robin Murphy wrote:
> If so, I'd much rather see this done properly, i.e. hook everything up 
> similarly to dma-direct and be able to drop CONFIG_DMA_OPS for "modern" 
> dma-direct/iommu-dma architectures entirely.

Yes.  That is much better than doing hacks based on missing ops.

Note that the media subsystems just added another abuse of dma_map_ops
in drivers/ in addition to the existing vdpa one that we'll need to
kill again to fully get rid of dma_map_ops for common setups (in
addition to merging swiotlb-xen into main swiotlb finally).