netdev - Re: [PATCH] igb: fix kexec with igb

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Date:	Sun, 08 Mar 2009 14:18:26 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Jesse Brandeburg <jesse.brandeburg@...il.com>,
	David Miller <davem@...emloft.net>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	NetDev <netdev@...r.kernel.org>
Subject: Re: [PATCH] igb: fix kexec with igb

Rafael J. Wysocki wrote:
> On Sunday 08 March 2009, Yinghai Lu wrote:
>> Rafael J. Wysocki wrote:
>>> On Saturday 07 March 2009, Yinghai Lu wrote:
>>>> On Fri, Mar 6, 2009 at 11:18 PM, Jesse Brandeburg
>>>> <jesse.brandeburg@...il.com> wrote:
>>>>> On Fri, Mar 6, 2009 at 8:33 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>>>>> Impact: could probe igb
>>>>>>
>>>>>> Found one system with 82575EB, in the kernel that is kexeced, probe igb
>>>>>> failed with -2.
>>>>>>
>>>>>> it looks like the same behavior happened on forcedeth.
>>>>>>
>>>>>> try to check system_state to make sure if put it on D3
>>>>>>
>>>>>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>>>>>>
>>>>>> ---
>>>>>>  drivers/net/igb/igb_main.c |   19 ++++++++++++++-----
>>>>>>  1 file changed, 14 insertions(+), 5 deletions(-)
>>>>> I see the point of the patch, but I know for a fact that ixgbe when
>>>>> enabled for MSI-X also doesn't work with kexec.
>>>>>
>>>>> so my questions are:
>>>>> are you going to change every driver?
>>>> i tend to only change driver that i have related HW.
>>>>
>>>>> why can't this be fixed in core kernel code instead?
>>>> will check it.
>>>>
>>>>> Shouldn't pci_enable_device take it out of D3?
>>>>> Or maybe it should be taken out of D3 immediately if someone tries to
>>>>> ioremap any of the BARx registers?
>>>> looks like second kernel can not detect the state any more.
>>> In fact pci_enable_device() calls pci_set_power_state(dev, PCI_D0) as the first
>>> thing.  The question is why it doesn't work as expected.
>> not sure... please check the version for forcedeth that you made.
>>
>> commit 3cb5599a84c557c0dd9a19feb63a3788268cf249
>> Author: Rafael J. Wysocki <rjw@...k.pl>
>> Date:   Fri Sep 5 14:00:19 2008 -0700
>>
>>     forcedeth: fix kexec regression
>>     
>>     Fix regression tracked as http://bugzilla.kernel.org/show_bug.cgi?id=11361
>>     and caused by commit f735a2a1a4f2a0f5cd823ce323e82675990469e2 ("[netdrvr]
>>     forcedeth: setup wake-on-lan before shutting down") that makes network
>>     adapters integrated into the NVidia MCP55 chipsets fail to work in kexeced
>>     kernels.  The problem appears to be that if the adapter is put into D3_hot
>>     during ->shutdown(), it cannot be brought back into D0 after kexec (ref.
>>     http://marc.info/?l=linux-kernel&m=121900062814967&w=4).  Therefore, only
>>     put forcedeth into D3 during ->shutdown() if the system is to be powered
>>     off.
> 
> Thanks, I remember now.
> 
> This appears to be quirky hardware, doesn't it?
> 
all my systems with ck804 and mcp55 need this trick.

for igb: one system need this trick, and other doesn't need this trick.
could BIOS/ACPI difference or the nic option rom difference.

but for kexec path, we really don't need put pci devices to D3.

YH

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