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[Vincent Cheng <vcheng@xxxxxxxxxx>]

/usr/bin/intel_l3_parity now shipped in intel-gpu-tools 1.7-1 (utopic)

** Changed in: intel-gpu-tools (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1234260

Title:
  Package and use 'intel_l3_parity' binary

Status in intel:
  Confirmed
Status in “intel-gpu-tools” package in Ubuntu:
  Fix Released
Status in “udev” package in Ubuntu:
  New

Bug description:
  For Haswell systems, Intel has created a new tool called
  'intel_l3_parity'. They have requested that we use this so that we can
  make use of the l3 parity feature on these cards. Quote:

    DPF (L3 Parity): Haswell has extra cache which can be dynamically (during run time) 
    used to replace cachelines which are exhibiting faulty behavior.

    It follows that Haswell also has the ability to detect the errors.

    Kernel driver receives the error interrupts and reports them to userspace via udev. 
    The event is a parity error.

    Userspace should be listening for the udev events, and handling them in whatever way 
    they see fit.

    We expected OSVs to add such hooks to their distributions, and use the intel_l3_parity 
    tool to be invoked by their udev rules as needed.

  The code for the binary can be found here, it looks like they're
  planning on adding it to the linux kernel tree but afact it's not in
  Linus' tree yet:

  http://article.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/10847/match=intel_l3_parity

  Also I haven't seen a udev script from them as yet. According to Intel
  the way it works is that udev has to catch the party check and then do
  the right thing by calling intel_l3_parity the right way.

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