linux-kernel - Re: [PATCH 1/5] ACPI: Allow handlers to be installed at the same time as methods

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Date:	Wed, 6 Oct 2010 21:30:27 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Moore, Robert" <robert.moore@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 1/5] ACPI: Allow handlers to be installed at the same time as methods

On Wednesday, October 06, 2010, Matthew Garrett wrote:
> On Wed, Oct 06, 2010 at 09:14:07AM -0700, Moore, Robert wrote:
> 
> > Although there exists a single Windows document mentions this behavior as a windows "feature", I'm not 100% convinced that this is actually true. AFAIK, we've never seen a machine that depends on an "implicit notify" on a device when a wake GPE happens.
> 
> Such behaviour would be irrelevant for system sleep/wake - the only 
> requirement is in runtime power management.
> 
> > It appears to me that the biggest issue right now is the fact that a Notify() must be performed on a Device object, and the problem is how to associate the GPE with the device object.
> 
> The other important aspect of this is that a single GPE may correspond 
> to multiple devices. The methods will generally cope with this by either 
> sending multiple notifies, executing some SMM code to identify the 
> relevant device or reading PCI configuration registers to identify the 
> source of the wakeup. We need to handle that case as well.

So, as I said, we can modify acpi_gpe_can_wake() to pass a device object to
ACPICA.  Then, the device object will be added to the list of devices to Notify()
if the GPE is signaled.  Plain and simple.

Thanks,
Rafael
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