Re: ACPI regression? Was Re: Ethernet chip disappeared from lspci

[Jiang Liu]

On 2015/6/21 22:19, Boszormenyi Zoltan wrote:
> 2015-06-21 16:03 keltezÃssel, Bjorn Helgaas Ãrta:
>> [+cc linux-pci]
>>
>> Hi Boszormenyi,
>>
>> On Sun, Jun 21, 2015 at 5:34 AM, Boszormenyi Zoltan <zboszor@xxxxx> wrote:
>>> Hi,
>>>
>>> please, cc me, I am not subscribed to lkml.
>>>
>>>> Hi,
>>>>
>>>> [lkml.org still broken --> no accurate mail header info possible...]
>>>>
>>>> Just to ask the obvious:
>>>> I assume using /sys/bus/pci/rescan does not help once it's broken?
>>>> (since the machine comes up empty at initial-boot scan, too)
>>> I will try it, too, but I am not sure it would work.
>>>
>>> Currently I can't test it because the last time I completely discharged
>>> the battery. I also disconnected it to be able to get the realtek chip back
>>> immediately for faster testing. Now, that I have reconnected the battery,
>>> I need to wait for it to be charged somewhat to be able to reproduce
>>> losing the network chip.
>>>
>>>> Also, you could try diffing lspci -vvxxx -s.... output
>>>> of working vs. "distorting" kernel version - perhaps some register setup
>>>> has been changed (e.g. due to power management improvements or some such),
>>>> which may encourage the card
>>>> to get a problematic/corrupt state.
>>> I attached a tarball that contains lspci -vvxxx for
>>> - all devices / only the network chip
>>> - before / after "modprobe r8169"
>>> - for all 3 kernel versions tested.
>>>
>>> I figured out that if I type the modprobe and lspci in the same command line,
>>> I can get diagnostics out of the machine, after all.
>>>
>>> It's not just the Realtek chip that has changed parameters.
>>>
>>> (Vague idea) I noticed that some devices have changed like this:
>>>
>>> -       Memory behind bridge: 80000000-801fffff
>>> -       Prefetchable memory behind bridge: 0000000080200000-00000000803fffff
>>> +       Memory behind bridge: ff000000-ff1fffff
>>> +       Prefetchable memory behind bridge: 00000000ff200000-00000000ff3fffff
>>>
>>> Can't this cause a problem? E.g. programming the bridge with an address range
>>> that the bridge doesn't actually support?
>> This worked in v3.18.16, but not in v4.0.5 or v4.1.0-rc8.  You
>> attached a v4.1.0-rc8 dmesg log earlier.  Would you mind collecting a
>> v3.18.16 dmesg log, so we can compare them?
> 
> I collected all 3 for you to compare them, compressed, attached.
> 
> BTW, I browsed git log and found 2ea3d266bab3b497238113b20136f7c3f69ad9c0
> as suspicious. I will try the 4.0/4.1 kernels with this one reverted.
> 
>>
>> These (from the v4.1.0-rc8 dmesg) look wrong, but I'll have to look at
>> the code to see what might be going on:
>>
>>   acpi PNP0A08:00: host bridge window expanded to [mem
>> 0x00000000-0xffffffff window]; [mem 0x00000000-0xffffffff window]
>> ignored
>>   pci 0000:00:1c.1: can't claim BAR 15 [mem 0xfdf00000-0xfdffffff
>> 64bit pref]: address conflict with PCI Bus 0000:00 [mem
>> 0xf0000000-0xfed8ffff window]
>>
>> Bjorn
Hi Bjorn and Boszormenyi,
	From the 3.18 kernel, we got a message:
[    0.126248] acpi PNP0A08:00: host bridge window
[0x400000000-0xfffffffff] (ignored, not CPU addressable)
	And from 4.1.-rc8, we got another message:
[    0.127051] acpi PNP0A08:00: host bridge window expanded to [mem
0x00000000-0xffffffff window]; [mem 0x00000000-0xffffffff window] ignored

That smells like a 32bit overflow or 64bit cut-off issue.

Hi Boszormenyi, could you please help to provide acpidump from the
machine?
Thanks!
Gerry

	

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