linux-kernel - Re: [BUG] Bisected Problem with LSI PCI FC Adapter

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Message-ID: <ghioku5l29.fsf@lena.gouders.net>
Date:	Thu, 11 Sep 2014 15:43:58 +0200
From:	Dirk Gouders <dirk@...ders.net>
To:	Andreas Noever <andreas.noever@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Bisected Problem with LSI PCI FC Adapter

Andreas Noever <andreas.noever@...il.com> writes:

> On Wed, Sep 3, 2014 at 2:47 PM, Dirk Gouders <dirk@...ders.net> wrote:
>> Andreas Noever <andreas.noever@...il.com> writes:
>>
>>> On Wed, Sep 3, 2014 at 12:57 PM, Dirk Gouders <dirk@...ders.net> wrote:
>>>> On a Tyan VX50 (B4985) I ran into problems when updating the kernel: the
>>>> PCI FC Adapter is no longer recognized.
>>>
>>> Can you provide the output of lspci -vvv and the output of dmesg from
>>> a working boot? Which card is the one that is not recognized?
>>
>> Sure, the card that disappeared is:
>>
>> 0a:00.0 Fibre Channel: LSI Logic / Symbios Logic FC949ES Fibre Channel Adapter (rev 02)
>
> As far as I can tell the following is happening:
> The root bus resource window (advertised by the bios?) is to small:
> pci_bus 0000:00: root bus resource [bus 00-07]
> Previously we didn't really care. There is a resource conflict but we
> ignored it:
> pci_bus 0000:0a: busn_res: can not insert [bus 0a] under [bus 00-07]
> (conflicts with (null) [bus 00-07])
> With the patch we mark the bridge as broken and reassign the bus to 06:
> pci 0000:00:0e.0: bridge configuration invalid ([bus 0a-0a]), reconfiguring
> pci 0000:00:0e.0: PCI bridge to [bus 06-07]
> pci 0000:00:0e.0:   bridge window [io  0x3000-0x3fff]
> pci 0000:00:0e.0:   bridge window [mem 0xd4200000-0xd42fffff]
> pci_bus 0000:06: busn_res: [bus 06-07] end is updated to 06
>
> We still scan for children but nothing shows up ("PCI bridge to" is
> from pci_scan_child_bus -> pcibios_fixup_bus -> pci_read_bridge_base,
> after pci_scan_slot). I have no idea why the device does not respond.

Andreas,

I found an identical FC Adapter here (backup) and was hoping to be able to
setup a test-machine where I can easily reproduce the problem, but
on that machine, the problem does not occur. So, I have to stick to the
busy machine for testing and diagnosis.

What I further did was rebooting the problematic machine and
enabling more messages (dyndbg="file drivers/pci/* +pf") with
the working and problematic kernel; the dmesg output is attached.

Dirk


View attachment "dmesg.problem" of type "text/plain" (80038 bytes)

View attachment "dmesg.working" of type "text/plain" (81235 bytes)