[PATCH 0/8] dma-mapping: migrate to physical address-based API
Christoph Hellwig
hch at lst.de
Mon Jun 30 23:38:39 AEST 2025
On Fri, Jun 27, 2025 at 08:02:13PM +0300, Leon Romanovsky wrote:
> > Thanks for this rework! I assume that the next step is to add map_phys
> > callback also to the dma_map_ops and teach various dma-mapping providers
> > to use it to avoid more phys-to-page-to-phys conversions.
>
> Probably Christoph will say yes, however I personally don't see any
> benefit in this. Maybe I wrong here, but all existing .map_page()
> implementation platforms don't support p2p anyway. They won't benefit
> from this such conversion.
I think that conversion should eventually happen, and rather sooner than
later.
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