linux-kernel - Questions about IOMMU & PCIe switch

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Message-ID: <54ACB0D4.3000008@apollo.lv>
Date:	Wed, 07 Jan 2015 06:06:44 +0200
From:	Raimonds Cicans <ray@...llo.lv>
To:	linux-kernel@...r.kernel.org
Subject: Questions about IOMMU & PCIe switch

Hello.

We have two kinds of PCIe cards:
A1 - based on chip B
A2 - based on same chip B but behind PCIe switch

Card A1 work flawlessly in any configuration,
but card A2 work flawlessly only if system
lack IOMMU or have disabled IOMMU

Questions:
Do we have to treat card with PCIe switch in special way?
How?
Where (PCI bridge driver? card's driver?)?
Any examples in kernel?

Thank you.

Raimonds Cicans
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