linux-kernel - linux-3.1-0-rc4 bus error ... MPS configured higher than maximum supported by the device. If a bus issue occurs, try running with pci=pcie_bus

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Date:	Mon, 5 Sep 2011 22:55:45 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>, Jordan_Hargrave@...l.com,
	Jon Mason <mason@...i.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: linux-3.1-0-rc4 bus error ... MPS configured higher than maximum
 supported by the device. If a bus issue occurs, try running with pci=pcie_bus_safe.

Got the following error after upgrading from linux-2.6.36 to
linux-3.1.0-rc4 on a Dell PowerEdge 2950 that has a PCIe fax card, and
the system LED panel shows "Bus Fatal Error".

Is is normal or should I try out "pci=pcie_bus_safe" or "pci=pci" as
suggested in the dmesg?

There was another error that also showed up on 2.6.36 but I'm ignoring
that for now ( ... disabling ASPM on pre-1.1 PCIe device.  You can
enable it with 'pcie_aspm=force')

pci 0000:07:00.0: Dev MPS 128 MPSS 256 MRRS 4096
pci 0000:07:00.0: Dev MPS 256 MPSS 256 MRRS 128
pci 0000:08:00.0: Dev MPS 128 MPSS 128 MRRS 128
pci 0000:08:00.0: MPS configured higher than maximum supported by the
device.  If a bus issue occurs, try running with pci=pcie_bus_safe.
pci 0000:08:00.0: Dev MPS 256 MPSS 256 MRRS 128
Uhhuh. NMI received for unknown reason 31 on CPU 0.
Do you have a strange power saving mode enabled?
Dazed and confused, but trying to continue
pci 0000:07:01.0: Dev MPS 128 MPSS 256 MRRS 4096
pci 0000:07:01.0: Dev MPS 256 MPSS 256 MRRS 128
pci 0000:00:06.0: Dev MPS 256 MPSS 256 MRRS 128
pci 0000:0e:00.0: Dev MPS 128 MPSS 128 MRRS 512
pci 0000:0e:00.0: MPS configured higher than maximum supported by the
device.  If a bus issue occurs, try running with pci=pci

Thanks,
Jeff.
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