linux-kernel - Re: Questions about IOMMU & PCIe switch

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Message-ID: <54AD21E2.2020100@ladisch.de>
Date:	Wed, 07 Jan 2015 13:09:06 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Raimonds Cicans <ray@...llo.lv>, linux-kernel@...r.kernel.org
Subject: Re: Questions about IOMMU & PCIe switch

Raimonds Cicans wrote:
> 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

In theory, such a switch should be transparent.

> Do we have to treat card with PCIe switch in special way?

No.  But the switch has to work correctly, and driver must be
written correctly.

Which switch?  Which driver?


Regards,
Clemens
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