swiotlb cleanups v2

[Christoph Hellwig]

Any comments? I would be good to make some progress on this series
as the base for the various additional pools.

On Mon, Mar 01, 2021 at 08:44:22AM +0100, Christoph Hellwig wrote:
> Hi Konrad,
> 
> this series contains a bunch of swiotlb cleanups, mostly to reduce the
> amount of internals exposed to code outside of swiotlb.c, which should
> helper to prepare for supporting multiple different bounce buffer pools.
> 
> Changes since v1:
>  - rebased to v5.12-rc1
>  - a few more cleanups
>  - merge and forward port the patch from Claire to move all the global
>    variables into a struct to prepare for multiple instances
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