linux-kernel - Re: Machine restart doesn't work - Intel 965G, 2.6.19-rc2 / e1000?

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Date:	Tue, 17 Oct 2006 14:17:04 -0700
From:	Auke Kok <auke-jan.h.kok@...el.com>
To:	Aleksey Gorelov <dared1st@...oo.com>
CC:	Ryan Richter <ryan@....solarneutrino.net>,
	Lukas Hejtmanek <xhejtman@...l.muni.cz>,
	linux-kernel@...r.kernel.org, auke-jan.h.kok@...el.com,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>
Subject: Re: Machine restart doesn't work - Intel 965G, 2.6.19-rc2 / e1000?

Aleksey Gorelov wrote:
> 
> --- Ryan Richter <ryan@....solarneutrino.net> wrote:
>> 2.6.19-rc1-git9 doesn't work any better for me.  I haven't tried
>> unloading the e1000 module yet.  Since I run the machine off an nfsroot,
>> it will require some creativity to test that.
>>
>> -ryan
> 
> You may try the following patch instead if it's easier for you. It'll likely break suspend stuff,
> but you won't need to play around with modules.
> 
> Aleks.
> 
> --- linux-2.6.19-rc2/drivers/net/e1000/e1000_main.c.orig	2006-10-17 13:36:06.000000000 -0700
> +++ linux-2.6.19-rc2/drivers/net/e1000/e1000_main.c	2006-10-17 13:36:50.000000000 -0700
> @@ -4847,6 +4847,7 @@
>  static void e1000_shutdown(struct pci_dev *pdev)
>  {
>  	e1000_suspend(pdev, PMSG_SUSPEND);
> +	pci_set_power_state(pdev, PCI_D0);
>  }
>  
>  #ifdef CONFIG_NET_POLL_CONTROLLER

I wouldn't do that like this, since e1000_suspend already does a pci_set_power_state() 
right before it exits, and doing two of those closely after another might result in an 
undetermined state.

I would be more interested in forcing D3 state instead of the current 
`pci_set_power_state(pdev, pci_choose_state(pdev, state));` in e1000_suspend, so can you 
try this instead?

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index ce0d35f..30ceeec 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -4793,7 +4793,7 @@ #endif

         pci_disable_device(pdev);

-       pci_set_power_state(pdev, pci_choose_state(pdev, state));
+       pci_set_power_state(pdev, PCI_D3hot);

         return 0;
  }

alternatively, you can try PCI_D3cold or PCI_D0, but setting the device to D0 is a 
no-op: the device is already in D0 at run-time, so that's silly.

In any case: this is not a driver bug, but really (unfortunately) a platform issue, so 
this fix is not suitable for general cases *at all*, and we'd have to validate this 
nasty workaround on all other chipsets that e1000 supports too, something that ain't 
going to happen I'm sure.

constructive: I've just spend some time working with e100+suspend+shutdown+netconsole, 
so I'll audit e1000 for that in the next few weeks and make sure that all works 
properly. Perhaps that yields something for you.

Cheers,

Auke
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