linux-kernel - Re: 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:	Tue, 6 Sep 2011 14:09:07 +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>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 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.

On Mon, Sep 5, 2011 at 10:55 PM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
> 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

The above aspm and bus error went away after I added pcie_aspm=force
and pci=pcie_bus_safe.

Instead of default to pcie_bus_perf that caused problems, why not
default to the formal behavior (see commit
b03e7495a862b028294f59fc87286d6d78ee7fa1).

Thanks,
Jeff
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