linux-kernel - Re: Supermicro X9SRL-F - channel enumeration error & ACPI/firmware bug question

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Date:	Mon, 26 Nov 2012 17:11:09 -0800
From:	Dan Williams <dan.j.williams@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Bruno Prémont <bonbons@...ux-vserver.org>,
	Justin Piszcz <jpiszcz@...idpixels.com>,
	support@...ermicro.com, linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	"dave.jiang" <dave.jiang@...el.com>
Subject: Re: Supermicro X9SRL-F - channel enumeration error & ACPI/firmware
 bug question

On Mon, Nov 26, 2012 at 4:56 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> The "channel error register unreachable" message indicates that
> pci_read_config_dword() failed.  The register in question
> (IOAT_PCI_CHANERR_INT_OFFSET) is at 0x180, so possibly we don't have
> PCI config accessors for the extended config space (0x100-0xfff).  A
> complete dmesg log should show that.

Yes, this happens when extended pci configuration space is not
reachable.  Although the need to access this register has been found
to no longer be needed.  So, it appears this patch [1] from Dave
should be modified to just stop touching that register altogether and
then go to -stable.

--
Dan

[1]: http://marc.info/?l=linux-kernel&m=135310841032707&w=2
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