Messages in this thread | | | From | Arnd Bergmann <> | Date | Thu, 21 Apr 2022 09:36:46 +0200 | Subject | Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN |
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On Thu, Apr 21, 2022 at 9:20 AM Christoph Hellwig <hch@infradead.org> wrote: > > Btw, there is another option: Most real systems already require having > swiotlb to bounce buffer in some cases. We could simply force bounce > buffering in the dma mapping code for too small or not properly aligned > transfers and just decrease the dma alignment.
I like the idea because these days we already rely on bounce buffering for sub-page buffers in many iommu based cases for strict isolation purposes, as well as most 64-bit machines that lack an iommu.
Does this work on all 32-bit architectures as well? I see that you added swiotlb for ARM LPASE systems in 2019, but I don't know if that has any additional requirements for the other 32-bit architectures that don't select SWIOTLB today.
Arnd
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