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

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Date:	Thu, 26 Nov 2009 23:52:44 -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

>>
> 
> 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?

maybe we need keep that feature default to be disabled.

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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