lkml.org 
[lkml]   [2007]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: PME_Turn_Off in Linux
    On Wed, Jan 17, 2007 at 10:43:14AM -0600, Miller, Mike (OS Dev) wrote:
    > 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?

    This firmware that implements the PCI-E connection should do this, I
    don't think there is anything that the Operating system can do to
    control this, as PCI-E should be transparant to the OS.

    Unless this is on a PCI-E Hotplug system? What is the sequence of
    events that cause the data corruption?

    thanks,

    greg k-h
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-01-17 22:59    [W:3.094 / U:1.064 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site