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

[Jesse Barnes <jbarnes@virtuousgeek.org>]

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

> From: Rafael J. Wysocki <rjw@sisk.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@intel.com>.

This one looks pretty nice.

-- 
Jesse Barnes, Intel Open Source Technology Center