[Bug 93865] New: debugfs: expose fifo pipe underrun, overrun counts

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93865

            Bug ID: 93865
           Summary: debugfs: expose fifo pipe underrun, overrun counts
           Product: DRI
           Version: DRI git
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: joe.konno at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I believe a mechanism for counting pipe [under,over]runs would be useful during
debug.

If, during a particular workload, you consistently see X pipe underruns, and
then apply a patch and see "10% less" pipe underruns, you can say you've
progressed or regressed.

Propose adding a quick counter every vsync. I'll post an RFC patch today or
tomorrow.

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