Re: [PATCH 4/8] dma-buf: add peer2peer flag

From: Christoph Hellwig
Date: Fri Apr 20 2018 - 06:18:03 EST

On Fri, Apr 20, 2018 at 10:58:50AM +0200, Christian König wrote:
> > Yes there's a bit a layering violation insofar that drivers really
> > shouldn't each have their own copy of "how do I convert a piece of dma
> > memory into dma-buf", but that doesn't render the interface a bad idea.
> Completely agree on that.
> What we need is an sg_alloc_table_from_resources(dev, resources,
> num_resources) which does the handling common to all drivers.

A structure that contains

{page,offset,len} + {dma_addr+dma_len}

is not a good container for storing

{virt addr, dma_addr, len}

no matter what interface you build arond it. And that is discounting
all the problems around mapping coherent allocations for other devices,
or the iommu merging problem we are having another thread on.

So let's come up with a better high level interface first, and then
worrty about how to implement it in the low-level dma-mapping interface
second. Especially given that my consolidation of the dma_map_ops
implementation is in full stream and there shoudn't be all that many
to bother with.

So first question: Do you actually care about having multiple
pairs of the above, or instead of all chunks just deal with a single
of the above? In that case we really should not need that many
new interfaces as dma_map_resource will be all you need anyway.

> Christian.
> > -Daniel
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