netdev - Re: [PATCH] net: forcedeth use pci_choose_state instead of PCI_D3hot

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Date:	Sun, 17 Aug 2008 13:58:27 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Jeff Garzik" <jgarzik@...hat.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: forcedeth use pci_choose_state instead of PCI_D3hot - v2

On Sun, Aug 17, 2008 at 12:34 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Sunday, 17 of August 2008, Rafael J. Wysocki wrote:
>> On Sunday, 17 of August 2008, Yinghai Lu wrote:
>> > On Sun, Aug 17, 2008 at 9:55 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> > > On Sunday, 17 of August 2008, Rafael J. Wysocki wrote:
>> > >> On Sunday, 17 of August 2008, Yinghai Lu wrote:
>> > >> > after
>> > >> >
>> > >> > | commit f735a2a1a4f2a0f5cd823ce323e82675990469e2
>> > >> > | Author: Tobias Diedrich <ranma+kernel@...edrich.de>
>> > >> > | Date:   Sun May 18 15:02:37 2008 +0200
>> > >> > |
>> > >> > |    [netdrvr] forcedeth: setup wake-on-lan before shutting down
>> > >> > |
>> > >> > |    When hibernating in 'shutdown' mode, after saving the image the suspend hook
>> > >> > |    is not called again.
>> > >> > |    However, if the device is in promiscous mode, wake-on-lan will not work.
>> > >> > |    This adds a shutdown hook to setup wake-on-lan before the final shutdown.
>> > >> > |
>> > >> > |    Signed-off-by: Tobias Diedrich <ranma+kernel@...edrich.de>
>> > >> > |    Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
>> > >> >
>> > >> > my servers with nvidia mcp55 nic doesn't work with msi in second kernel by kexec
>> > >> >
>> > >> > after remove pci_set_power_state(, PCI_D3hot) that nic/msi will work again.
>> > >> >
>> > >> > check with e1000 is using pci_choose_state in _shutdown.
>> > >
>> > > This is wrong.
>> > >
>> > >> > So change that pci_choose_state(pdev, ...), and it works.
>> > >>
>> > >> Well, this doesn't look like a good solution to me, because you're putting
>> > >> PMSG_SUSPEND in there, which is not correct for shutdown.  The right thing to
>> > >> do would be to avoid changing the device power state if nv_shutdown() is
>> > >> used for kexec or to rework the initialization of the adapter to handle the
>> > >> case when it's initially in D3.
>> > >>
>> > >> Does it help if you just remove the pci_set_power_state(pdev, PCI_D3hot)
>> > >> altogether?
>> > >
>> > > Ah, sorry.  I see it does.
>> > >
>> > > Actually, I think you can use pci_prepare_to_sleep() instead of
>> > > pci_enable_wake() / pci_set_power_state() combo.  It wasn't designed for this
>> > > purpose, but should work nevertheless.
>> > >
>> > > Can you please check if the appended patch works instead of your one?
>> > >
>> > > Rafael
>> > >
>> > > ---
>> > > Fix the problem that boxes with NVidia MCP55 don't work with MSI
>> > > in a kexeced kernel.
>> > >
>> > > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
>> > > ---
>> > >  drivers/net/forcedeth.c |    4 +---
>> > >  1 file changed, 1 insertion(+), 3 deletions(-)
>> > >
>> > > Index: linux-2.6/drivers/net/forcedeth.c
>> > > ===================================================================
>> > > --- linux-2.6.orig/drivers/net/forcedeth.c
>> > > +++ linux-2.6/drivers/net/forcedeth.c
>> > > @@ -5975,10 +5975,8 @@ static void nv_shutdown(struct pci_dev *
>> > >        if (netif_running(dev))
>> > >                nv_close(dev);
>> > >
>> > > -       pci_enable_wake(pdev, PCI_D3hot, np->wolenabled);
>> > > -       pci_enable_wake(pdev, PCI_D3cold, np->wolenabled);
>> > >        pci_disable_device(pdev);
>> > > -       pci_set_power_state(pdev, PCI_D3hot);
>> > > +       pci_prepare_to_sleep(pdev);
>> > >  }
>> > >  #else
>> > >  #define nv_suspend NULL
>> > >
>> > >
>> >
>> > your patch doesn't work...  it seems that silicon has problem with D3Hot
>>
>> Okay, so perhaps it's better to do something like this:
>>
>> ---
>>  drivers/net/forcedeth.c |    8 +++++---
>>  1 file changed, 5 insertions(+), 3 deletions(-)
>>
>> Index: linux-2.6/drivers/net/forcedeth.c
>> ===================================================================
>> --- linux-2.6.orig/drivers/net/forcedeth.c
>> +++ linux-2.6/drivers/net/forcedeth.c
>> @@ -5975,10 +5975,12 @@ static void nv_shutdown(struct pci_dev *
>>       if (netif_running(dev))
>>               nv_close(dev);
>>
>> -     pci_enable_wake(pdev, PCI_D3hot, np->wolenabled);
>> -     pci_enable_wake(pdev, PCI_D3cold, np->wolenabled);
>>       pci_disable_device(pdev);
>> -     pci_set_power_state(pdev, PCI_D3hot);
>> +     if (system_state == SYS_POWER_OFF) {
>
> Sorry, it should be SYSTEM_POWER_OFF here.  Corrected patch is appended.
>
>> +             if (pci_enable_wake(pdev, PCI_D3cold, np->wolenabled))
>> +                     pci_enable_wake(pdev, PCI_D3hot, np->wolenabled);
>> +             pci_set_power_state(pdev, PCI_D3hot);
>> +     }
>>  }
>>  #else
>>  #define nv_suspend NULL
>> --
>
> ---
>  drivers/net/forcedeth.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> Index: linux-2.6/drivers/net/forcedeth.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/forcedeth.c
> +++ linux-2.6/drivers/net/forcedeth.c
> @@ -5975,10 +5975,12 @@ static void nv_shutdown(struct pci_dev *
>        if (netif_running(dev))
>                nv_close(dev);
>
> -       pci_enable_wake(pdev, PCI_D3hot, np->wolenabled);
> -       pci_enable_wake(pdev, PCI_D3cold, np->wolenabled);
>        pci_disable_device(pdev);
> -       pci_set_power_state(pdev, PCI_D3hot);
> +       if (system_state == SYSTEM_POWER_OFF) {
> +               if (pci_enable_wake(pdev, PCI_D3cold, np->wolenabled))
> +                       pci_enable_wake(pdev, PCI_D3hot, np->wolenabled);
> +               pci_set_power_state(pdev, PCI_D3hot);
> +       }
>  }
>  #else
>  #define nv_suspend NULL
>

why not like e1000 to
pci_set_power_state(pdev, pci_choose_state(pdev, PMSG_SUSPEND));

pci_choose_state would check if platform support those state...

YH
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