linux-kernel - Re: [PATCH 3/12] PCI PM: PCIe PME root port service driver (rev. 5)

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Date:	Wed, 6 Jan 2010 13:53:30 -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 3/12] PCI PM: PCIe PME root port service driver (rev. 5)

On Sun, 27 Dec 2009 21:01:24 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> PCIe native PME detection mechanism is based on interrupts generated
> by root ports or event collectors every time a PCIe device sends a
> PME message upstream.
> 
> Once a PME message has been sent by an endpoint device and received
> by its root port (or event collector in the case of root complex
> integrated endpoints), the Requester ID from the message header is
> registered in the root port's Root Status register.  At the same
> time, the PME Status bit of the Root Status register is set to
> indicate that there's a PME to handle.  If PCIe PME interrupt is
> enabled for the root port, it generates an interrupt once the PME
> Status has been set.  After receiving the interrupt, the kernel can
> identify the PCIe device that generated the PME using the Requester
> ID from the root port's Root Status register. [For details, see PCI
> Express Base Specification, Rev. 2.0.]
> 
> Implement a driver for the PCIe PME root port service working in
> accordance with the above description.
> 
> Based on a patch from Shaohua Li <shaohua.li@...el.com>.

This one looks pretty nice.

-- 
Jesse Barnes, Intel Open Source Technology Center
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