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Date: Fri, 22 Jun 2012 20:24:53 +0800
From: Fengguang Wu <wfg@...ux.intel.com>
To: Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: boot hang on commit "PM / ACPI: Fix suspend/resume regression
caused by cpuidle cleanup."
Hi Deepthi,
I can no longer reproduce this issue... Sorry for the noise!
Thanks,
Fengguang
On Fri, Jun 22, 2012 at 03:26:51PM +0530, Deepthi Dharwar wrote:
> Hi,
>
> This is interesting .. suspend fix breaking boot on kvm.
>
> We complied and booted fine with mainline kernels including 3.5-rc2 with
> this fix on servers and laptops.
> So wondering how different is booting on machines Vs
> from kvm ?
>
> Also, are you seeing smooth boot on kvm by reverting only this patch ?
>
> Cheers
> Deepthi
>
> On 06/22/2012 01:05 PM, wfg@...ux.intel.com wrote:
>
> > Hi Deepthi,
> >
> > It seems that commit de08622 triggers a boot hang in my kvm boot test.
> >
> > kvm -cpu kvm64 -enable-kvm \
> > -kernel ./gpxelinux.lkrn \
> > -initrd ./kvm.gpxe \
> > -m 384M \
> > -net nic,vlan=0,macaddr=00:00:00:00:00:00,model=e1000 \
> > -net user,vlan=0,hostfwd=tcp::$port-:22 \
> > -boot order=nc \
> > -no-reboot \
> > -watchdog i6300esb \
> > $(qemu_drives) \
> > -pidfile $pidfile \
> > -serial file:$dmesg
> >
> > tree: git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
> > head: de08622731417ba429fc470ab8f2d7c260cb5c72
> > commit: de08622731417ba429fc470ab8f2d7c260cb5c72 [9/9] PM / ACPI: Fix suspend/resume regression caused by cpuidle cleanup.
> > config: x86_64-allyesdebian (attached as .config)
> >
> > x86_64-allyesdebian bbbbbbbbbB
> > --
> > 8: b 0eb8c06 2012-06-19 22:23:37 +0200 PM / Sleep: Separate printing suspend times from initcall_debug
> > 9: B de08622 boot hang after [ 81.370898] usbcore: registered new interface driver dw2102
> >
> > legend: [b] boot fine [B] boot error
> >
> > commit de08622731417ba429fc470ab8f2d7c260cb5c72
> > Author: Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
> > Date: Wed Jun 13 16:28:17 2012 +0530
> >
> > PM / ACPI: Fix suspend/resume regression caused by cpuidle cleanup.
> >
> > Commit e978aa7d7d57d04eb5f88a7507c4fb98577def77 ( cpuidle: Move
> > dev->last_residency update to driver enter routine; remove dev->last_state)
> > was breaking suspend on laptops, as reported in the below link
> > - https://lkml.org/lkml/2011/11/11/164
> >
> > This was fixed in commit 3439a8da16bcad6b0982ece938c9f8299bb53584
> > (ACPI / cpuidle: Remove acpi_idle_suspend (to fix suspend regression)
> > by removing acpi_idle_suspend flag.
> > - https://lkml.org/lkml/2011/11/14/74
> >
> > But this fix did not work on all systems
> > as Suspend/resume regression was reported on Lenovo S10-3
> > recently by Dave.
> > - https://lkml.org/lkml/2012/5/27/115
> > It looked like with commit e978aa7d broke suspend and
> > with commit 3439a8da resume was not working with acpi_idle driver.
> >
> > This patch fixes the regression that caused this issue
> > in the first place. acpi_idle_suspend flag is essential on
> > some x86 systems to prevent the cpus from going to deeper C-states
> > when suspend is triggered ( commit b04e7bdb984 )
> > So reverting the commit 3439a8da is essential.
> >
> > By default, irqs are disabled in cpu_idle arch specific call
> > and re-enabled in idle state return path . As the acpi_idle_suspend
> > flag was being set during suspend, which prevented the cpus
> > going to deeper idle states, it is essential to
> > enabling the irqs in its return path too.
> >
> > To address the suspend issue,
> > we were not re-enabling the interrupts while returning from
> > acpi_idle_enter_bm() routine if acpi_idle_suspend flag is set.
> > and this was causing suspend failure.
> >
> > In addition to the above fix, a sanity check has also been added
> > in x86 arch specific cpu_idle call to ensure that the idle call
> > always returns with IRQs enabled.
> >
> > Signed-off-by: Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
> > Reported-and-Tested-by: Dav Hansen <dave@...ux.vnet.ibm.com>
> > Tested-by: Preeti Murthy <preeti@...ux.vnet.ibm.com>
> > Reviewed-by: Srivatsa S Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> >
> > diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
> > index 735279e..8ab76ad 100644
> > --- a/arch/x86/kernel/process.c
> > +++ b/arch/x86/kernel/process.c
> > @@ -460,6 +460,12 @@ void cpu_idle(void)
> > pm_idle();
> >
> > rcu_idle_exit();
> > +
> > + /*
> > + * Sanity check to ensure that idle call returns
> > + * with IRQs enabled
> > + */
> > + WARN_ON(irqs_disabled());
> > start_critical_timings();
> >
> > /* In many cases the interrupt that ended idle
> > diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> > index f3decb3..c2ffd84 100644
> > --- a/drivers/acpi/processor_idle.c
> > +++ b/drivers/acpi/processor_idle.c
> > @@ -224,6 +224,7 @@ static void lapic_timer_state_broadcast(struct acpi_processor *pr,
> > /*
> > * Suspend / resume control
> > */
> > +static int acpi_idle_suspend;
> > static u32 saved_bm_rld;
> >
> > static void acpi_idle_bm_rld_save(void)
> > @@ -242,13 +243,21 @@ static void acpi_idle_bm_rld_restore(void)
> >
> > int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
> > {
> > + if (acpi_idle_suspend == 1)
> > + return 0;
> > +
> > acpi_idle_bm_rld_save();
> > + acpi_idle_suspend = 1;
> > return 0;
> > }
> >
> > int acpi_processor_resume(struct acpi_device * device)
> > {
> > + if (acpi_idle_suspend == 0)
> > + return 0;
> > +
> > acpi_idle_bm_rld_restore();
> > + acpi_idle_suspend = 0;
> > return 0;
> > }
> >
> > @@ -754,6 +763,12 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
> >
> > local_irq_disable();
> >
> > + if (acpi_idle_suspend) {
> > + local_irq_enable();
> > + cpu_relax();
> > + return -EINVAL;
> > + }
> > +
> > lapic_timer_state_broadcast(pr, cx, 1);
> > kt1 = ktime_get_real();
> > acpi_idle_do_entry(cx);
> > @@ -823,6 +838,12 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
> >
> > local_irq_disable();
> >
> > + if (acpi_idle_suspend) {
> > + local_irq_enable();
> > + cpu_relax();
> > + return -EINVAL;
> > + }
> > +
> > if (cx->entry_method != ACPI_CSTATE_FFH) {
> > current_thread_info()->status &= ~TS_POLLING;
> > /*
> > @@ -901,6 +922,13 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
> > if (unlikely(!pr))
> > return -EINVAL;
> >
> > + if (acpi_idle_suspend) {
> > + if (irqs_disabled())
> > + local_irq_enable();
> > + cpu_relax();
> > + return -EINVAL;
> > + }
> > +
> > if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
> > if (drv->safe_state_index >= 0) {
> > return drv->states[drv->safe_state_index].enter(dev,
>
--
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