linux-kernel - PCIe host controller behind IOMMU on ARM

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Message-ID: <PS1PR06MB11807CBE8EB2AC6B0158D2B5F52A0@PS1PR06MB1180.apcprd06.prod.outlook.com>
Date:	Wed, 4 Nov 2015 13:57:48 +0000
From:	Phil Edworthy <phil.edworthy@...esas.com>
To:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>,
	Magnus <magnus.damm@...il.com>
Subject: PCIe host controller behind IOMMU on ARM

Hi,

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?

Thanks
Phil

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