Re: [PATCH v5 00/10] virtio DMA API, yet again

From: David Woodhouse
Date: Fri Jan 29 2016 - 06:01:24 EST

On Thu, 2016-01-28 at 18:31 -0800, Andy Lutomirski wrote:
> To everyone else: we've waffled on this for way too long. I think
> we should to get DMA API implementation in with a conservative
> policy like this rather than waiting until we achieve perfection.
> I'm tired of carrying these patches around.

Yeah, do it.

However,,, shouldn't the generic no-op DMA ops be checking the dma_mask
of the device and bitching if it can't reach the address in question?

Also, wasn't Christoph looking at making per-device DMA ops more
generic instead of an 'archdata' thing on basically every platform? Or
did I just imagine that part?

Not that I'm suggesting you make the s390 patch wait for that *instead*
of using archdata there, mind you. But I was kind of planning to let
the dust settle on this lot before I sort out the theoretical-except-
in-simulation issues with VT-d IOMMU covering *some* devices but not

David Woodhouse Open Source Technology Centre
David.Woodhouse@xxxxxxxxx Intel Corporation

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