linux-kernel - PME_Turn

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Message-ID: <E717642AF17E744CA95C070CA815AE550116B7C8@cceexc23.americas.cpqcorp.net>
Date:	Wed, 17 Jan 2007 10:43:14 -0600
From:	"Miller, Mike (OS Dev)" <Mike.Miller@...com>
To:	"LKML" <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Cc:	"Nguyen, Tom L" <tom.l.nguyen@...el.com>,
	"Brainard, Jim" <jim.brainard@...com>,
	"Patterson, Andrew D (Linux R&D)" <andrew.patterson@...com>
Subject: PME_Turn_Off in Linux

Hello,
We've been seeing some nasty data corruption issues on some platforms.
We've been capturing PCI-E traces looking for something nasty but we
haven't found anything yet. One of the hardware guys if asking if there
is a call in Linux to issue a PME_Turn_Off broadcast message.

PME_Turn_Off Broadcast Message
Before main component power and reference clocks are turned off, the
Root Complex or Switch Downstream Port must issue a broadcast Message
that instructs all agents downstream of that point within the hierarchy
to cease initiation of any subsequent PM_PME Messages, effective
immediately upon receipt of the PME_Turn_Off Message.

This must be initiated from the root complex. Is there such a call in
linux?

Thanks,
mikem

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