[Bug 67600] New: gen7_queue_flip doesn't work on RCS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67600

          Priority: medium
            Bug ID: 67600
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: gen7_queue_flip doesn't work on RCS
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: marchesin at icps.u-strasbg.fr
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 83409
  --> https://bugs.freedesktop.org/attachment.cgi?id=83409&action=edit
i915_error_state

I noticed that on IVB, page flips ioctls end up blocking when the GPU is busy.
Specifically the RCS -> BCS ring switch seems to be what's taking time (this
time is spent in i915_gem_object_pin_to_display_plane).

When I try to use the RCS instead of the BCS ring (by changing gen7_queue_flip)
on my IVB chromebook (8086:0166) I get GPU lockups. Attached is the
i915_error_state (undecoded).

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