linux-kernel - Re: [PATCH 1/2] pci: release that leaf bridge' resource that is not big -v11

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Date:	Fri, 27 Nov 2009 15:13:50 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alex Chiang <achiang@...com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH 1/2] pci: release that leaf bridge' resource that is not
 big -v11

Kenji Kaneshige wrote:
> Yinghai Lu wrote:
>>> Bad news...
>>>
>>> My system doesn't boot (hangup) with your latest set of patches.
>>> Fusion MPT SAS driver initialization failed on some devices.
>>> Please see below
>>>
>>> ...
>>> Fusion MPT SAS Host driver 3.04.12
>>> mptsas 0000:09:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
>>> mptsas 0000:09:00.0: BAR 1: can't reserve [mem 0x00510000-0x00513fff
>>> 64bit]
>>> mptbase: ioc0: ERROR - pci_request_selected_regions() with MEM failed
>>> mptsas 0000:0a:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
>>> mptsas 0000:0a:00.0: BAR 1: can't reserve [mem 0x00610000-0x00613fff
>>> 64bit]
>>> mptbase: ioc1: ERROR - pci_request_selected_regions() with MEM failed
>>> ...
>>>
>>>
>>> This problem disappear when I revert the patch 6/9, and my system
>>> can boot. But I found igb driver initialization failed on some
>>> devices even in this case. Please see below
>>>
>>> ...
>>> igb 0000:08:00.0: BAR 0: can't reserve [mem 0x00100000-0x0011ffff]
>>> igb 0000:08:00.0: PCI INT A disabled
>>> igb: probe of 0000:08:00.0 failed with error -16
>>> igb 0000:08:00.1: PCI INT B -> GSI 18 (level, low) -> IRQ 18
>>> igb 0000:08:00.1: BAR 0: can't reserve [mem 0x00140000-0x0015ffff]
>>> igb 0000:08:00.1: PCI INT B disabled
>>> igb: probe of 0000:08:00.1 failed with error -16
>>> ...
>>
>> that looks werid, without patch 6/9 should only have pci bridge res
>> shrink problem with your last test?
>>
> 
> I don't know why. I might have overlooked it at the previous
> test.
> 
>> maybe we need keep that feature default to be disabled.
> 
> Will do it next week.


> 
> Thanks,
> Kenji Kaneshige
> 
> 
>>
>> please try
>>
>> ---
>>  drivers/pci/setup-bus.c |    3 +--
>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> Index: linux-2.6/drivers/pci/setup-bus.c
>> ===================================================================
>> --- linux-2.6.orig/drivers/pci/setup-bus.c
>> +++ linux-2.6/drivers/pci/setup-bus.c
>> @@ -918,8 +918,7 @@ static void pci_bus_dump_resources(struc
>>   * second try will clear small leaf bridge res
>>   * third try will clear related bridge: some aggressive
>>   */
>> -/* assume we only have 4 level bridges, so only try 5 times */
>> -int pci_try_num = 5;
>> +int pci_try_num = 1;
>>  void __init
>>  pci_assign_unassigned_resources(void)
>>  {
>>
>>
> 

don't try it. found the cause.

even change pci_try_num = 1 will not help.

...

will have another patch.

Thanks

Yinghai 
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