On Fri, 07 Nov 2025 10:11:05 -0600, Gaurav Batra wrote:
> Leverage ARCH_HAS_DMA_MAP_DIRECT config option for coherent allocations as
> well. This will bypass DMA ops for memory allocations that have been
> pre-mapped.
>
> Always set device bus_dma_limit when memory is pre-mapped. In some
> architectures, like PowerPC, pmemory can be converted to regular memory via
> daxctl command. This will gate the coherent allocations to pre-mapped RAM
> only, by dma_coherent_ok().
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/iommu: bypass DMA APIs for coherent allocations for pre-mapped
memory
https://git.kernel.org/powerpc/c/1471c517cf7dae1a6342fb821d8ed501af956dd0
cheers
