On Tue, May 21, 2024 at 01:00:16PM -0300, Jason Gunthorpe wrote: > > > Err, no. There should really be no exported cache manipulation macros, > > > as drivers are almost guaranteed to get this wrong. I've added > > > Russell to the Cc list who has been extremtly vocal about this at least > > > for arm. > > > > We could possibly move this under some IOMMU core API (ie flush and > > map, unmap and flush), the iommu APIs are non-modular so this could > > avoid the exported symbol. > > Though this would be pretty difficult for unmap as we don't have the > pfns in the core code to flush. I don't think we have alot of good > options but to make iommufd & VFIO handle this directly as they have > the list of pages to flush on the unmap side. Use a namespace? Just have a unmap version that also takes a list of PFNs that you'd need for non-coherent mappings?
