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

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Date:	Sun, 17 Aug 2008 21:29:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
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 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) {
+		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
--
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