On Thu, Mar 05, 2020 at 12:30:56PM +0000, Robin Murphy wrote: > Right - LPAE configs should be getting dma-direct ops since 5.3, which > already respect the limit. For non-LPAE configs it means you go from being > broken from having no limit at all, to having a limit set but not > respected, which is still equally broken, but no *more* so than before. Actually, dma-direct doesn't automatically respect the bus limit. For various architectures including arm it uses the arch_dma_alloc callout, which for arm just uses the existing arm coherent allocator. Thay being said I'm still looking for reviewers for the arm dma coherent allocator bus limit fix..
