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

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Message-ID: <54AE410B.40101@ladisch.de>
Date:	Thu, 08 Jan 2015 09:34:19 +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:
> https://github.com/ljalves/linux_media/issues/66

If the TBS driver works, why don't you use it?

The WARNING from the kernel log indicates a hardware bug in the PCIe
bridge.  Do you have the same card, and do you also get this warning
with kernel 3.16?

I/O virtualization requires handling packets from different devices
differently.  Problems with DMAR might indicate that some PCIe device
does not correctly identify itself as the source of PCIe packets.

Regards,
Clemens
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