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Date: Sun, 8 Mar 2009 22:32:35 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Yinghai Lu <yinghai@...nel.org>
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
On Sunday 08 March 2009, 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.
In which case you need to rework igb_shutdown() rather than igb_suspend().
Something like the patch below, perhaps (totally untested).
Thanks,
Rafael
---
drivers/net/igb/igb_main.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)
Index: linux-2.6/drivers/net/igb/igb_main.c
===================================================================
--- linux-2.6.orig/drivers/net/igb/igb_main.c
+++ linux-2.6/drivers/net/igb/igb_main.c
@@ -4299,7 +4299,7 @@ int igb_set_spd_dplx(struct igb_adapter
}
-static int igb_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __igb_shutdown(struct pci_dev *pdev, bool enable_wake)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct igb_adapter *adapter = netdev_priv(netdev);
@@ -4359,7 +4359,7 @@ static int igb_suspend(struct pci_dev *p
}
/* make sure adapter isn't asleep if manageability/wol is enabled */
- if (wufc || adapter->en_mng_pt) {
+ if ((wufc || adapter->en_mng_pt) && enable_wake) {
pci_enable_wake(pdev, PCI_D3hot, 1);
pci_enable_wake(pdev, PCI_D3cold, 1);
} else {
@@ -4374,12 +4374,21 @@ static int igb_suspend(struct pci_dev *p
pci_disable_device(pdev);
- pci_set_power_state(pdev, pci_choose_state(pdev, state));
-
return 0;
}
#ifdef CONFIG_PM
+static int igb_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ int retval;
+
+ retval = __igb_shutdown(pdev, true);
+ if (!retval)
+ pci_set_power_state(pdev, PCI_D3hot);
+
+ return retval;
+}
+
static int igb_resume(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
@@ -4434,7 +4443,12 @@ static int igb_resume(struct pci_dev *pd
static void igb_shutdown(struct pci_dev *pdev)
{
- igb_suspend(pdev, PMSG_SUSPEND);
+ if (system_state == SYSTEM_POWER_OFF) {
+ __igb_shutdown(pdev, true);
+ pci_set_power_state(pdev, PCI_D3hot);
+ } else {
+ __igb_shutdown(pdev, false);
+ }
}
#ifdef CONFIG_NET_POLL_CONTROLLER
--
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