linux-kernel - Re: [PATCH 10/12] PCI / ACPI / PM: Platform support for PCI PME wake-up (rev. 6)

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Message-ID: <20100106140414.6d03cef1@jbarnes-piketon>
Date:	Wed, 6 Jan 2010 14:04:14 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Matthew Garrett <mjg@...hat.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Oliver Neukum <oliver@...kum.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Shaohua Li <shaohua.li@...el.com>,
	Francois Romieu <romieu@...zoreil.com>
Subject: Re: [PATCH 10/12] PCI / ACPI / PM: Platform support for PCI PME
 wake-up (rev. 6)

On Sun, 27 Dec 2009 21:07:36 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Although the majority of PCI devices can generate PMEs that in
> principle may be used to wake up devices suspended at run time,
> platform support is generally necessary to convert PMEs into wake-up
> events that can be delivered to the kernel.  If ACPI is used for this
> purpose, a PME generated by a PCI device will trigger the ACPI GPE
> associated with the device to generate an ACPI wake-up event that we
> can set up a handler for, provided that everything is configured
> correctly.
> 
> Unfortunately, the subset of PCI devices that have GPEs associated
> with them is quite limited and the other devices have to rely on
> the GPEs associated with their upstream bridges and, possibly, the
> root bridge to generate ACPI wake-up events in response to PMEs from
> them.  Moreover, ACPI-based PCI hotplug also uses ACPI notify
> handlers that in general may conflict with the PM notify handlers,
> unless this issue is specifically taken care of.
> 
> Add ACPI platform support for PCI PME wake-up:
> o Add a framework making is possible to use ACPI system notify
>   handlers for both PM and hotplug at the same time and to take the
>   wake-up GPE sharing into account.
> o Add new PCI platform callback ->run_wake() to struct
>   pci_platform_pm_ops allowing us to enable/disable the platform to
>   generate wake-up events for given device.  Implemet this callback
>   for the ACPI platform.
> o Define ACPI wake-up handlers for PCI devices and PCI buses and make
>   the PCI-ACPI binding code register wake-up notifiers for devices
>   associated with wake-up GPEs.
> o Add function pci_dev_run_wake() which can be used by PCI drivers to
>   check if given device is capable of generating wake-up events at
>   run time.
> 
> Developed in cooperation with Matthew Garrett <mjg@...hat.com>.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Looks pretty good, though my comment about the bool taking functions
applies here too.

-- 
Jesse Barnes, Intel Open Source Technology Center
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