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Yes indeed this is not "correct" however I didn't know how to do it properly so I am sending this as "RFC" to get some help to clean this up properly :) If I understood correctly the remaining part of your review: including this header is not needed anymore since we don't need to call `iommu_setup_dma_ops()` anymore. So let's remove both the incorrect non-public header include and the call to iommu_setup_dma_ops(). > >> + switch (dir) { >> + case DMA_TO_DEVICE: >> + break; >> + case DMA_FROM_DEVICE: >> + break; >> + >> + case DMA_BIDIRECTIONAL: >> + inval_dcache_range(paddr, size); > Doing this just for bidirectional is weird unless your architecture > never does any speculative prefetching. Other architectures > include DMA_FROM_DEVICE here. Indeed our arch never does any speculative prefetching on data. > >> +#ifdef CONFIG_IOMMU_DMA >> +void arch_teardown_dma_ops(struct device *dev) >> +{ >> + dev->dma_ops = NULL; >> +} >> +#endif /* CONFIG_IOMMU_DMA*/ > This should not be needed right now. And will be completley > useless once we do the direct calls to dma-iommu which we plan > to do for Linux 6.12. Alright, let's remove this. > >> +void arch_setup_dma_ops(struct device *dev, bool coherent) >> +{ >> + dev->dma_coherent = coherent; >> + if (device_iommu_mapped(dev)) >> + iommu_setup_dma_ops(dev); >> +} > And this seems odd, as iommu_setup_dma_ops is called from the iommu > code and you shouldn't need it here. Let's remove the `if device_iommu_mapped(dev)) iommu_setup_dma_ops(dev);` then. > > I also wonder if we can come up with a way to do the ->dma_coherent > setup in common code and remove a few of these arch hooks entirely. Thanks! Regards, -- Yann