Re: [Xen-devel] [PATCH v1 1/2] genirq: Fix error path for resuming irqs

["dbasehore ." <dbasehore@xxxxxxxxxxxx>]

Adding maintainers for affected systems to this CL for review.

On Mon, Jul 7, 2014 at 8:33 AM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Fri, Jun 27, 2014 at 05:04:24PM -0700, Derek Basehore wrote:
>> In the case of a late abort to suspend/hibernate, irqs marked with
>> IRQF_EARLY_RESUME will not be enabled. This is due to syscore_resume not 
>> getting
>> called on these paths.
>>
>> This can happen with a pm test for platform, a late wakeup irq, and other
>> instances. This change removes the function from syscore and calls it 
>> explicitly
>> in suspend, hibernate, etc.
>>
>> This regression was introduced in 9bab0b7f "genirq: Add IRQF_RESUME_EARLY"
>>
>> Signed-off-by: Derek Basehore <dbasehore@xxxxxxxxxxxx>
>
> Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>
> on the Xen side.
>> ---
>>  drivers/base/power/main.c |  5 ++++-
>>  drivers/xen/manage.c      |  5 ++++-
>>  include/linux/interrupt.h |  1 +
>>  include/linux/pm.h        |  2 +-
>>  kernel/irq/pm.c           | 17 +++--------------
>>  kernel/kexec.c            |  2 +-
>>  kernel/power/hibernate.c  |  6 +++---
>>  kernel/power/suspend.c    |  2 +-
>>  8 files changed, 18 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
>> index bf41296..a087473 100644
>> --- a/drivers/base/power/main.c
>> +++ b/drivers/base/power/main.c
>> @@ -712,8 +712,10 @@ static void dpm_resume_early(pm_message_t state)
>>   * dpm_resume_start - Execute "noirq" and "early" device callbacks.
>>   * @state: PM transition of the system being carried out.
>>   */
>> -void dpm_resume_start(pm_message_t state)
>> +void dpm_resume_start(pm_message_t state, bool enable_early_irqs)
>>  {
>> +     if (enable_early_irqs)
>> +             early_resume_device_irqs();
>>       dpm_resume_noirq(state);
>>       dpm_resume_early(state);
>>  }
>> @@ -1132,6 +1134,7 @@ static int dpm_suspend_noirq(pm_message_t state)
>>       if (error) {
>>               suspend_stats.failed_suspend_noirq++;
>>               dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
>> +             early_resume_device_irqs();
>>               dpm_resume_noirq(resume_event(state));
>>       } else {
>>               dpm_show_time(starttime, state, "noirq");
>> diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
>> index c3667b2..d387cdf 100644
>> --- a/drivers/xen/manage.c
>> +++ b/drivers/xen/manage.c
>> @@ -68,6 +68,7 @@ static int xen_suspend(void *data)
>>       err = syscore_suspend();
>>       if (err) {
>>               pr_err("%s: system core suspend failed: %d\n", __func__, err);
>> +             early_resume_device_irqs();
>>               return err;
>>       }
>>
>> @@ -92,6 +93,8 @@ static int xen_suspend(void *data)
>>               xen_timer_resume();
>>       }
>>
>> +     early_resume_device_irqs();
>> +
>>       syscore_resume();
>>
>>       return 0;
>> @@ -137,7 +140,7 @@ static void do_suspend(void)
>>
>>       raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);
>>
>> -     dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
>> +     dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE, false);
>>
>>       if (err) {
>>               pr_err("failed to start xen_suspend: %d\n", err);
>> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
>> index 698ad05..7f390e3 100644
>> --- a/include/linux/interrupt.h
>> +++ b/include/linux/interrupt.h
>> @@ -193,6 +193,7 @@ extern void irq_wake_thread(unsigned int irq, void 
>> *dev_id);
>>  /* The following three functions are for the core kernel use only. */
>>  extern void suspend_device_irqs(void);
>>  extern void resume_device_irqs(void);
>> +extern void early_resume_device_irqs(void);
>>  #ifdef CONFIG_PM_SLEEP
>>  extern int check_wakeup_irqs(void);
>>  #else
>> diff --git a/include/linux/pm.h b/include/linux/pm.h
>> index 72c0fe0..ae5b26a 100644
>> --- a/include/linux/pm.h
>> +++ b/include/linux/pm.h
>> @@ -677,7 +677,7 @@ struct dev_pm_domain {
>>
>>  #ifdef CONFIG_PM_SLEEP
>>  extern void device_pm_lock(void);
>> -extern void dpm_resume_start(pm_message_t state);
>> +extern void dpm_resume_start(pm_message_t state, bool enable_early_irqs);
>>  extern void dpm_resume_end(pm_message_t state);
>>  extern void dpm_resume(pm_message_t state);
>>  extern void dpm_complete(pm_message_t state);
>> diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
>> index abcd6ca..b07dc9c 100644
>> --- a/kernel/irq/pm.c
>> +++ b/kernel/irq/pm.c
>> @@ -60,26 +60,15 @@ static void resume_irqs(bool want_early)
>>  }
>>
>>  /**
>> - * irq_pm_syscore_ops - enable interrupt lines early
>> + * early_resume_device_irqs - enable interrupt lines early
>>   *
>>   * Enable all interrupt lines with %IRQF_EARLY_RESUME set.
>>   */
>> -static void irq_pm_syscore_resume(void)
>> +void early_resume_device_irqs(void)
>>  {
>>       resume_irqs(true);
>>  }
>> -
>> -static struct syscore_ops irq_pm_syscore_ops = {
>> -     .resume         = irq_pm_syscore_resume,
>> -};
>> -
>> -static int __init irq_pm_init_ops(void)
>> -{
>> -     register_syscore_ops(&irq_pm_syscore_ops);
>> -     return 0;
>> -}
>> -
>> -device_initcall(irq_pm_init_ops);
>> +EXPORT_SYMBOL_GPL(early_resume_device_irqs);
>>
>>  /**
>>   * resume_device_irqs - enable interrupt lines disabled by 
>> suspend_device_irqs()
>> diff --git a/kernel/kexec.c b/kernel/kexec.c
>> index 369f41a..272853b 100644
>> --- a/kernel/kexec.c
>> +++ b/kernel/kexec.c
>> @@ -1700,7 +1700,7 @@ int kernel_kexec(void)
>>               local_irq_enable();
>>   Enable_cpus:
>>               enable_nonboot_cpus();
>> -             dpm_resume_start(PMSG_RESTORE);
>> +             dpm_resume_start(PMSG_RESTORE, true);
>>   Resume_devices:
>>               dpm_resume_end(PMSG_RESTORE);
>>   Resume_console:
>> diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
>> index fcc2611..1d6dd56 100644
>> --- a/kernel/power/hibernate.c
>> +++ b/kernel/power/hibernate.c
>> @@ -325,7 +325,7 @@ static int create_image(int platform_mode)
>>       platform_finish(platform_mode);
>>
>>       dpm_resume_start(in_suspend ?
>> -             (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
>> +             (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE, true);
>>
>>       return error;
>>  }
>> @@ -482,7 +482,7 @@ static int resume_target_kernel(bool platform_mode)
>>   Cleanup:
>>       platform_restore_cleanup(platform_mode);
>>
>> -     dpm_resume_start(PMSG_RECOVER);
>> +     dpm_resume_start(PMSG_RECOVER, true);
>>
>>       return error;
>>  }
>> @@ -574,7 +574,7 @@ int hibernation_platform_enter(void)
>>   Platform_finish:
>>       hibernation_ops->finish();
>>
>> -     dpm_resume_start(PMSG_RESTORE);
>> +     dpm_resume_start(PMSG_RESTORE, true);
>>
>>   Resume_devices:
>>       entering_platform_hibernation = false;
>> diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
>> index 4dd8822..3597c72 100644
>> --- a/kernel/power/suspend.c
>> +++ b/kernel/power/suspend.c
>> @@ -281,7 +281,7 @@ static int suspend_enter(suspend_state_t state, bool 
>> *wakeup)
>>       if (need_suspend_ops(state) && suspend_ops->wake)
>>               suspend_ops->wake();
>>
>> -     dpm_resume_start(PMSG_RESUME);
>> +     dpm_resume_start(PMSG_RESUME, true);
>>
>>   Platform_finish:
>>       if (need_suspend_ops(state) && suspend_ops->finish)
>> --
>> 2.0.0.526.g5318336
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-devel

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