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 17:26:53 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
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

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)
>  {
> 
> 


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