[PATCH v3 3/4] ARM: dma-mapping: Switch to physical address mapping callbacks

[Jason Gunthorpe]

On Wed, Sep 17, 2025 at 09:46:25PM +0300, Leon Romanovsky wrote:
> Let's take as an example MIPS/jazzdma, should we call to vdma_alloc()
> in DMA_ATTR_MMIO case?

Yes, that is right, this is an iommu, so it has to be programmed.

> or directly return "phys" as it is done in other
> architectures?

Which?

> > vdpa can support ATTR_MMIO with the same iommu prot MMIO adjustment,
> > that would be a good additional patch.
> 
> There is "bounce page" in VDPA, it sounds like swiotlb to me, which
> doesn't work with MMIO.

Oh OK, it eventually does call pfn_to_page().. This isn't the case I
thought it was, there is another one that just routes to iommu_map

Jason