cleanup swiotlb initialization v8

[Konrad Rzeszutek Wilk]

On Mon, Apr 04, 2022 at 07:05:44AM +0200, Christoph Hellwig wrote:
> Hi all,
> 
> this series tries to clean up the swiotlb initialization, including
> that of swiotlb-xen.  To get there is also removes the x86 iommu table
> infrastructure that massively obsfucates the initialization path.
> 
> Git tree:
> 
>     git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup
> 
> Gitweb:
> 
>     http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/swiotlb-init-cleanup
> 
> Changes since v7:
>  - rebased to Linux 5.18-rc1
>  - better document the lower bound swiotlb size for xen-swiotlb
>  - improve the nslabs calculation for the retry case in
>    swiotlb_init_remap and swiotlb_init_late

Hey Christoph,

Feel free to tack on

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>

on them if you would like.

Thank you for doing the spring cleaning of this codebase!