linux-kernel - Re: [PATCH resend] pci: ARI is a PCIe v2 feature

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Message-ID: <20110722084408.7be2e9bc@jbarnes-desktop>
Date:	Fri, 22 Jul 2011 08:44:08 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Don Dutile <ddutile@...hat.com>
Subject: Re: [PATCH resend] pci: ARI is a PCIe v2 feature

On Wed, 13 Jul 2011 10:14:33 -0700
Chris Wright <chrisw@...s-sol.org> wrote:

> The function pci_enable_ari() may mistakenly set the downstream port
> of a v1 PCIe switch in ARI Forwarding mode.  This is a PCIe v2 feature,
> and with an SR-IOV device on that switch port believing the switch above
> is ARI capable it may attempt to use functions 8-255, translating into
> invalid (non-zero) device numbers for that bus.  This has been seen
> to cause Completion Timeouts and general misbehaviour including hangs
> and panics.

Applied, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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