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Message-Id: <200808172134.20230.rjw@sisk.pl>
Date: Sun, 17 Aug 2008 21:34:19 +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, 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
--
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