On Thu, Sep 10, 2020 at 07:40:37AM +0200, Christoph Hellwig wrote: > The DMA offset notifier can only be used if PHYS_OFFSET is at least > KEYSTONE_HIGH_PHYS_START, which can't be represented by a 32-bit > phys_addr_t. Currently the code compiles fine despite that, a pending > change to the DMA offset handling would create a compiler warning for > this case. Add an ifdef to not compile the code except for LPAE > configs.
However, to have use of the high physical offset, LPAE needs to be enabled, which ensures that phys_addr_t is 64-bit. I believe that DMA is non-coherent on this platform unless the high physical address is used. Or something like that. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
