On Fri, Jun 27, 2025 at 08:02:13PM +0300, Leon Romanovsky wrote:

quoted

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.