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Date: Sat, 28 Mar 2009 22:27:28 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Yinghai Lu <yinghai@...nel.org>,
Jesse Brandeburg <jesse.brandeburg@...il.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: 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: [Updated patch] Re: [PATCH] igb: fix kexec with igb
On Tuesday 24 March 2009, Yinghai Lu wrote:
> Rafael J. Wysocki wrote:
> > On Thursday 12 March 2009, Yinghai Lu wrote:
> >> Rafael J. Wysocki wrote:
> >>> 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).
> >> it works, David, can you picked it up
> >
> > Still, Yinghai, can you please also test the patch below? It fixes all
> > shortcomings in the driver's suspend and shutdown methods I was talking about
> > in one of the previous messages. If it works, IMO it will be a preferable fix
> > (in particular, it would be good to check if WoL still works with it,
> > but I don't have the hardware).
> >
> > Thanks,
> > Rafael
> >
> > ---
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > Subject: net/igb: Fix kexec with igb (rev. 3)
> > Impact: Fix
> >
> > Yinghai Lu found one system with 82575EB where, in the kernel that is
> > kexeced, probe igb failed with -2, the reason being that the adapter
> > could not be brought back from D3 by the kexec kernel, most probably
> > due to quirky hardware (it looks like the same behavior happened on
> > forcedeth).
> >
> > Prevent igb from putting the adapter into D3 during shutdown except
> > when we going to power off the system. For this purpose, seperate
> > igb_shutdown() from igb_suspend() and use the appropriate PCI PM
> > callbacks in both of them.
> >
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > Reported-by: Yinghai Lu <yinghai@...nel.org>
> > ---
> > drivers/net/igb/igb_main.c | 42 ++++++++++++++++++++++++++++++------------
> > 1 file changed, 30 insertions(+), 12 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
> > @@ -4277,7 +4277,7 @@ 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);
> > @@ -4336,15 +4336,9 @@ static int igb_suspend(struct pci_dev *p
> > wr32(E1000_WUFC, 0);
> > }
> >
> > - /* make sure adapter isn't asleep if manageability/wol is enabled */
> > - if (wufc || adapter->en_mng_pt) {
> > - pci_enable_wake(pdev, PCI_D3hot, 1);
> > - pci_enable_wake(pdev, PCI_D3cold, 1);
> > - } else {
> > + *enable_wake = wufc || adapter->en_mng_pt;
> > + if (!*enable_wake)
> > igb_shutdown_fiber_serdes_link_82575(hw);
> > - pci_enable_wake(pdev, PCI_D3hot, 0);
> > - pci_enable_wake(pdev, PCI_D3cold, 0);
> > - }
> >
> > /* Release control of h/w to f/w. If f/w is AMT enabled, this
> > * would have already happened in close and is redundant. */
> > @@ -4352,12 +4346,29 @@ 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;
> > + bool wake;
> > +
> > + retval = __igb_shutdown(pdev, &wake);
> > + if (retval)
> > + return retval;
> > +
> > + if (wake) {
> > + pci_prepare_to_sleep(pdev);
> > + } else {
> > + pci_wake_from_d3(pdev, false);
> > + pci_set_power_state(pdev, PCI_D3hot);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > static int igb_resume(struct pci_dev *pdev)
> > {
> > struct net_device *netdev = pci_get_drvdata(pdev);
> > @@ -4412,7 +4423,14 @@ static int igb_resume(struct pci_dev *pd
> >
> > static void igb_shutdown(struct pci_dev *pdev)
> > {
> > - igb_suspend(pdev, PMSG_SUSPEND);
> > + bool wake;
> > +
> > + __igb_shutdown(pdev, &wake);
> > +
> > + if (system_state == SYSTEM_POWER_OFF) {
> > + pci_wake_from_d3(pdev, wake);
> > + pci_set_power_state(pdev, PCI_D3hot);
> > + }
> > }
> >
> > #ifdef CONFIG_NET_POLL_CONTROLLER
>
> it works too.
Great, thanks for testing.
Jeff, Jesse, is the patch fine with you?
Rafael
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