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SubjectRe: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device
On Mon, Mar 23, 2020 at 09:07:38PM +0530, Aneesh Kumar K.V wrote:
>
> This is what I was trying, but considering I am new to DMA subsystem, I
> am not sure I got all the details correct. The idea is to look at the
> cpu addr and see if that can be used in direct map fashion(is
> bus_dma_limit the right restriction here?) if not fallback to dynamic
> IOMMU mapping.

I don't think we can throw all these complications into the dma
mapping code. At some point I also wonder what the point is,
especially for scatterlist mappings, where the iommu can coalesce.

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