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SubjectRE: [Updated patch] Re: [PATCH] igb: fix kexec with igb
Rafael J. Wysocki wrote:
> On Monday 30 March 2009, Jeff Kirsher wrote:
>> On Sun, Mar 29, 2009 at 4:19 AM, Rafael J. Wysocki <rjw@sisk.pl>
>> wrote:
>>> On Sunday 29 March 2009, Jeff Kirsher wrote:
>>>> On Sat, Mar 28, 2009 at 2:27 PM, Rafael J. Wysocki <rjw@sisk.pl>
>>>> wrote:
>>>>> 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@gmail.com> wrote:
>>>>>>>>>>>>>> On Fri, Mar 6, 2009 at 8:33 PM, Yinghai Lu
>>>>>>>>>>>>>> <yinghai@kernel.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@kernel.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@sisk.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@sisk.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@sisk.pl>
>>>>>>> Reported-by: Yinghai Lu <yinghai@kernel.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
>>>>
>>>> Let me talk with Jesse on Monday about it. I know that Jesse's
>>>> concern's were that there were more than one driver afflicted with
>>>> the same or similar issue and that it made more sense to fix this
>>>> in the core for all drivers. For instance ixgbe, IIRC, but
>>>> because Yinghai did not have any other hardware, it was unclear if
>>>> this was an issue on other drivers.
>>>
>>> I think it was, at least theoretically. We should generally avoid
>>> powering off things on shutdown when it's not really necessary.
>>> Also, the use of pci_enable_wake() in these drivers is not really
>>> correct.
>>>
>>> And in fact this is why I'm asking, because I have analogouns
>>> patches for some other drivers in the works too. If you are fine
>>> with the approach, I'll post the whole series.
>>>
>>>> After discussing this with Jesse, one of us will respond. I will
>>>> apply this patch to my tree anyway and if we are alright with the
>>>> patch, I will push it out with my other patches to Dave.
>>>
>>> Thanks!
>>>
>>> Best,
>>> Rafael
>>> --
>>
>> After talking with Jesse, we are fine with it if our testers buy off
>> on it. I have the patch in my tree and so Emil will run a barrage of
>> regression/stress tests on the patch overnight. If everything looks
>> good, I will send it out with the other igb patches I have.

The patch checks out. I tested suspend/resume (including WOL) and kexec. There is only a small issue with warning on compile when CONFIG_PM is disabled:

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 13fe162..0a4f8f4 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -135,8 +135,8 @@ static inline int igb_set_vf_rlpml(struct igb_adapter *, int, int);
static int igb_set_vf_mac(struct igb_adapter *adapter, int, unsigned char *);
static void igb_restore_vf_multicasts(struct igb_adapter *adapter);

-static int igb_suspend(struct pci_dev *, pm_message_t);
#ifdef CONFIG_PM
+static int igb_suspend(struct pci_dev *, pm_message_t);
static int igb_resume(struct pci_dev *);
#endif
static void igb_shutdown(struct pci_dev *);
Thanks,
Emil
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