• Don Zickus's avatar
    x86, NMI: Add NMI IPI selftest · 99e8b9ca
    Don Zickus authored
    The previous patch modified the stop cpus path to use NMI
    instead of IRQ as the way to communicate to the other cpus to
    shutdown.  There were some concerns that various machines may
    have problems with using an NMI IPI.
    
    This patch creates a selftest to check if NMI is working at
    boot. The idea is to help catch any issues before the machine
    panics and we learn the hard way.
    
    Loosely based on the locking-selftest.c file, this separate file
    runs a couple of simple tests and reports the results.  The
    output looks like:
    
    ...
    Brought up 4 CPUs
    ----------------
    | NMI testsuite:
    --------------------
      remote IPI:  ok  |
       local IPI:  ok  |
    --------------------
    Good, all   2 testcases passed! |
    ---------------------------------
    Total of 4 processors activated (21330.61 BogoMIPS).
    ...
    Signed-off-by: default avatarDon Zickus <dzickus@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Robert Richter <robert.richter@amd.com>
    Cc: seiji.aguchi@hds.com
    Cc: vgoyal@redhat.com
    Cc: mjg@redhat.com
    Cc: tony.luck@intel.com
    Cc: gong.chen@intel.com
    Cc: satoru.moriya@hds.com
    Cc: avi@redhat.com
    Cc: Andi Kleen <andi@firstfloor.org>
    Link: http://lkml.kernel.org/r/1318533267-18880-3-git-send-email-dzickus@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
    99e8b9ca
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