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

Boszormenyi Zoltan
2015-06-21T18:28:20Z

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2015-06-21 19:25 keltezéssel, Jiang Liu írta:
> On 2015/6/21 22:19, Boszormenyi Zoltan wrote:
>> 2015-06-21 16:03 keltezéssel, Bjorn Helgaas írta:
>>> [+cc linux-pci]
>>>
>>> Hi Boszormenyi,
>>>
>>> On Sun, Jun 21, 2015 at 5:34 AM, Boszormenyi Zoltan <zboszor@pr.hu> 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?

I already did in a previous mail which was only sent to LKML, but here it is again.

Thanks,
Zoltán

> Thanks!
> Gerry
>
>
>
>

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