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

[Christoph Hellwig]

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).