From: H. Peter Anvin on
On 07/14/2010 11:19 AM, Pan, Jacob jun wrote:
>
> I have not seen the patch yet, but there is no guarantee that
> capabilities are always laid out in ascending address. So I think
> we cannot bail out when
> pcie_cap >> 20 <= pos
>
> If that is some bug in the config space, can we fix it with some quirks?
>

I don't understand where that arithmetic comes from.

Basic config space [0-255] and extended config space [256-4095] are laid
out completely differently, and they have separate capability chains.
In theory one could have extended capabilities in basic config space,
but since the root of that chain is at 0x100, you'd have to have
extended config space available anyway in order to see it.

-hpa
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From: H. Peter Anvin on
On 07/14/2010 07:14 AM, Ben Greear wrote:
> On 07/13/2010 08:29 PM, Robert Hancock wrote:
>> On Tue, Jul 13, 2010 at 8:22 PM, Ben Greear<greearb(a)candelatech.com> wrote:
>>>> Can you print out bus->number and devfn and look that up in lspci to
>>>> find out which device it's hitting? It looks like there's a device with
>>>> a PCI Express extended capability header that has a extended capability
>>>> ID of 0000h and a next capability offset of 100h, which points to
>>>> itself, causing the infinite loop. I'm guessing that if pcie_cap>> 20
>>>> <= pos then it should give up and break out of the loop, since it means
>>>> that the next capability pointer is invalidly pointing to the same or a
>>>> previous entry..
>>>
>>> Bailing out like that does let it boot.
>>>
>>> As for the bus and devfn: bus: 0 devfn: 129 (decimal)
>>>
>>> I'm not sure what to look for in lspci, but here is the output with -n:
>>
>> That will be device 0x10 function 1, this one:
>>
>> 00:10.1 0600: 8086:25f0 (rev b1)
>>
>> Intel 5000 Series Chipset FSB Registers, apparently.. What does lspci
>> -vv show for that device?
>
> 00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev b1)
> Subsystem: Super Micro Computer Inc Unknown device 9780
> Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> Kernel modules: i5000_edac, i5k_amb
>

Could you get the output of lspci -vv -xxxx for this device? I'm
confused why this device would identify as having extended config space...

-hpa
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From: H. Peter Anvin on
On 07/14/2010 11:22 AM, Ben Greear wrote:
>
> Is there at least a maximum number of capabilities that can exist so that
> you can limit the loop by that?
>

Well, 3072 bytes and a minimum size of 4 bytes, so 768. However, a
capability ID of 0000 or FFFF means no capabilities (PCIe 2.01 sec
7.9.1-2), so we should terminate the search on finding one of those
capability ID.

[Also note: bits 21:20 are reserved and need to be masked, per PCIe 2.01
7.9.3.]

The spec seems to imply that capabilities should be sequential, but I
really don't know if that is actually the case in the field.

-hpa
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From: Ben Greear on
On 07/14/2010 11:35 AM, H. Peter Anvin wrote:
> On 07/14/2010 07:14 AM, Ben Greear wrote:
>> On 07/13/2010 08:29 PM, Robert Hancock wrote:
>>> On Tue, Jul 13, 2010 at 8:22 PM, Ben Greear<greearb(a)candelatech.com> wrote:
>>>>> Can you print out bus->number and devfn and look that up in lspci to
>>>>> find out which device it's hitting? It looks like there's a device with
>>>>> a PCI Express extended capability header that has a extended capability
>>>>> ID of 0000h and a next capability offset of 100h, which points to
>>>>> itself, causing the infinite loop. I'm guessing that if pcie_cap>> 20
>>>>> <= pos then it should give up and break out of the loop, since it means
>>>>> that the next capability pointer is invalidly pointing to the same or a
>>>>> previous entry..
>>>>
>>>> Bailing out like that does let it boot.
>>>>
>>>> As for the bus and devfn: bus: 0 devfn: 129 (decimal)
>>>>
>>>> I'm not sure what to look for in lspci, but here is the output with -n:
>>>
>>> That will be device 0x10 function 1, this one:
>>>
>>> 00:10.1 0600: 8086:25f0 (rev b1)
>>>
>>> Intel 5000 Series Chipset FSB Registers, apparently.. What does lspci
>>> -vv show for that device?
>>
>> 00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev b1)
>> Subsystem: Super Micro Computer Inc Unknown device 9780
>> Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
>> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast>TAbort-<TAbort-<MAbort->SERR-<PERR- INTx-
>> Kernel modules: i5000_edac, i5k_amb
>>
>
> Could you get the output of lspci -vv -xxxx for this device? I'm
> confused why this device would identify as having extended config space...
>
> -hpa


00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev b1)
Subsystem: Super Micro Computer Inc Unknown device 9780
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Kernel modules: i5000_edac, i5k_amb
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10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 d9 15 80 97
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
40: f0 01 34 46 00 00 00 00 37 23 54 45 42 59 03 00
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60: 00 00 00 00 00 00 00 00 00 00 00 00 00 d0 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 03 02 00 00 00 02 00 00 00 02 00 00 00 00 00 00
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Thanks,
Ben

--
Ben Greear <greearb(a)candelatech.com>
Candela Technologies Inc http://www.candelatech.com

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