[linux-pm] [RFC 5/5] ACPI GPE based wakeup event detection

[Shaohua Li]

On Mon, Oct 20, 2008 at 04:39:47AM +0800, Rafael J. Wysocki wrote:
> On Thursday, 11 of September 2008, Shaohua Li wrote:
> > In ACPI platform, if native PME isn't enabled, GPE is used to report wakeup event.
> 
> Add more details here, please.
> 
> > ---
> >  drivers/acpi/Kconfig        |    9 ++++++
> >  drivers/acpi/bus.c          |   15 +++++++++++
> >  drivers/acpi/sleep/wakeup.c |   60 ++++++++++++++++++++++++++++++++++++++++++++
> >  include/acpi/acpi_bus.h     |    4 ++
> >  4 files changed, 88 insertions(+)
> >
> > Index: linux/drivers/acpi/Kconfig
> > ===================================================================
> > --- linux.orig/drivers/acpi/Kconfig   2008-09-11 10:56:25.000000000 +0800
> > +++ linux/drivers/acpi/Kconfig        2008-09-11 10:56:47.000000000 +0800
> > @@ -45,6 +45,15 @@ config ACPI_SLEEP
> >       depends on PM_SLEEP
> >       default y
> >
> > +config ACPI_GPE_WAKEUP
> 
> I'd call it ACPI_RUNTIME_WAKEUP
ok

> > +void unregister_acpi_bus_notifier(struct notifier_block *nb)
> > +{
> > +     blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
> > +}
> > +EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
> > +
> 
> We were talking about removing the notifier last time.  Please do that.
Did you see my comments on the issue last time? ACPI test tree already introduces
the mechanism for other purpose, and we can just use it.

> > --- linux.orig/include/acpi/acpi_bus.h        2008-09-11 10:56:25.000000000 +0800
> > +++ linux/include/acpi/acpi_bus.h     2008-09-11 10:56:47.000000000 +0800
> > @@ -327,6 +327,10 @@ int acpi_bus_get_private_data(acpi_handl
> >  extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
> >  extern int register_acpi_notifier(struct notifier_block *);
> >  extern int unregister_acpi_notifier(struct notifier_block *);
> > +
> > +extern int register_acpi_bus_notifier(struct notifier_block *nb);
> > +extern void unregister_acpi_bus_notifier(struct notifier_block *nb);
> > +
> >  /*
> >   * External Functions
> >   */
> >
> 
> I understand from the above that devices having their own wake-up GPEs will be
> handled.  However, it still is completely unclear to me what happens with
> devices that can generate PME# and for which there are no specific GPEs, like
> any devices on add-in cards.
As we discussed last time, pci bus for add-in cards will invoke a gpe, and
this new implementation will check all pci devices under a bridge to try to find
a device generating PME. This should work for add-in cards.

Thanks,
Shaohua