[PATCH v2 08/23] iommu/vtd: Use virt_to_phys()

[Baolu Lu]

On 2/15/25 01:07, Jason Gunthorpe wrote:
> If all the inlines are unwound virt_to_dma_pfn() is simply:
>     return page_to_pfn(virt_to_page(p)) << (PAGE_SHIFT - VTD_PAGE_SHIFT);
> 
> Which can be re-arranged to:
>     (page_to_pfn(virt_to_page(p)) << PAGE_SHIFT) >> VTD_PAGE_SHIFT
> 
> The only caller is:
>     ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT)
> 
> re-arranged to:
>     ((page_to_pfn(virt_to_page(tmp_page)) << PAGE_SHIFT) >> VTD_PAGE_SHIFT) << VTD_PAGE_SHIFT
> 
> Which simplifies to:
>     page_to_pfn(virt_to_page(tmp_page)) << PAGE_SHIFT
> 
> That is the same as virt_to_phys(tmp_page), so just remove all of this.
> 
> Signed-off-by: Jason Gunthorpe<jgg at nvidia.com>

Reviewed-by: Lu Baolu <baolu.lu at linux.intel.com>