linux-kernel - Re: [REGRESSION][v3.4-rc1] PCI: add a PCI resource reallocation config option

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Message-ID: <CAE9FiQV104AgXC+EaSvBzuRg7WTLEDvQZETPeWHY4gdpg2eY_w@mail.gmail.com>
Date:	Wed, 27 Nov 2013 23:17:24 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tim Gardner <tim.gardner@...onical.com>
Subject: Re: [REGRESSION][v3.4-rc1] PCI: add a PCI resource reallocation
 config option

On Wed, Nov 27, 2013 at 12:22 PM, Joseph Salisbury
<joseph.salisbury@...onical.com> wrote:
> Hi Yinghai,
>
> A kernel bug was opened against Ubuntu [0].  After a kernel bisect, it
> was found that the following commit introduced the bug:
>
> commit b07f2ebc109b607789f648dedcff4b125f9afec6
> Author: Yinghai Lu <yinghai@...nel.org>
> Date:   Thu Feb 23 19:23:32 2012 -0800
>
>     PCI: add a PCI resource reallocation config option
>
>
>
> The regression was introduced as of v3.4-rc1 and also exists in current
> mainline.
>
> The bug seems platform specific since we have not had allot of other
> reports.  The bug is preventing ixgbe to probe Intel x520 NIC's.
>
> It would be easy enough to disable the PCI_REALLOC_ENABLE_AUTO config
> option, but I wanted to get your feedback since you are the author.  It
> looks like the bug reporter may also be able to work around the problem
> with the pci=realloc=.

The bios has problem to have two functions rom bar to same place, and
root bus does
not enough mmio range and confuse realloc logic.

Please try attached patches to top of linus's tree, or your internal tree.

Thanks

Yinghai

View attachment "pcibus_addr_converting_bus.patch" of type "text/x-patch" (4049 bytes)

View attachment "auto_need_mmio64.patch" of type "text/x-patch" (3600 bytes)