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Date: Wed, 26 Jun 2013 08:12:34 +0800
From: Gavin Shan <shangw@linux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH 1/6] powerpc/eeh: Don't collect PCI-CFG data on PHB
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Cc: linuxppc-dev@lists.ozlabs.org, Gavin Shan <shangw@linux.vnet.ibm.com>
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On Wed, Jun 26, 2013 at 09:57:26AM +1000, Benjamin Herrenschmidt wrote:
>On Wed, 2013-06-26 at 07:49 +0800, Gavin Shan wrote:
>> It's something like the followings. For ER on PE#0, we will have
>> PE with type of EEH_PE_BUS marked as isolated, instead of the
>> one with EEH_PE_PHB.
>> 
>> 
>>         [ EEH_PE_PHB] <---> [ EEH_PE_PHB] <---> [ EEH_PE_PHB]
>>                                   |
>>                             [ EEH_PE_BUS ] PE#0
>>                                   |
>
>So we actually have two PEs here ? One real (PE#0) and one imaginary
>(PHB PE) with no PE# associated ?
>

Yes, The (PHB PE) is actually a container to all PEs under the
PHB ;-)

>>                         -------------------------
>>                         |                       |
>>                    [ EEH_PE_BUS ] PE#1     [ EEH_PE_BUS] PE#2
>> 
>> >I would either not bother and collect the FF's, or make this specific
>> >to fence and only fence.
>> >
>> 
>> I'd like to keep it specific to fenced PHB and it's already be
>> that :-)

Thanks,
Gavin