PCIe host controller behind IOMMU on ARM

Phil Edworthy phil.edworthy at renesas.com
Wed Nov 4 05:57:48 PST 2015


I am trying to hook up a PCIe host controller that sits behind an IOMMU,
but having some problems.

I'm using the pcie-rcar PCIe host controller and it works fine without
the IOMMU, and I can attach the IOMMU to the controller such that any calls
to dma_alloc_coherent made by the controller driver uses the iommu_ops
version of dma_ops.

However, I can't see how to make the endpoints to utilise the dma_ops that
the controller uses. Shouldn't the endpoints inherit the dma_ops from the
controller? Any pointers for this?


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