Re: [PATCH v8 00/23] dma-mapping: Track shared DMA state through direct, pool and swiotlb paths

[Jason Gunthorpe]

On Thu, Jul 23, 2026 at 10:51:08AM +0300, Leon Romanovsky wrote:
> On Wed, Jul 22, 2026 at 04:57:09PM -0300, Jason Gunthorpe wrote:
> > On Tue, Jul 21, 2026 at 03:40:56PM +0300, Leon Romanovsky wrote:
> > 
> > > Why don't we continue the effort to remove "struct page" entirely
> > > from the DMA API internals?
> > > 
> > > IMHO, everything not exposed to DMA API users should use
> > > phys_addr_t, including the DMA address pool.
> > 
> > The alloc interfaces return a struct page, that is why this stuff is
> > organized like this. Look at dma_alloc_pages()
> 
> And I didn't say that we should change dma_alloc_pages(). It is external
> API, which needs to be struct *page. I'm talking about internals.
> 
> Even dma_alloc_pages() flow shows how convoluted and non-uniform
> the code underneath which performs translations all the time.

Yeah, but I don't really want to go from phys/virt to page, I'd rather
see the other direction that is easier to reason about

Maybe some small wrapper that returned phys or whatever would clean
this up

Jason