[Bug 96291] [BDW/SKL] GPU hangs with programs using compute shaders

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96291

            Bug ID: 96291
           Summary: [BDW/SKL] GPU hangs with programs using compute
                    shaders
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Setup:
- SKL GT2
- Ubuntu 16.04:
  - latest Ubuntu kernel 4.4.0-22 (upstream v4.4.8 + i915 driver from v4.6-rc3)
- GfxBench v4: https://gfxbench.com/linux-download/
- Mesa from today (f87352d76966b6e4b0ab5fa9129ccd1ade0c2e7a)

Use-case:
- Start GfxBench
- Run Manhattan v3.1 test
- Run Car Chase test

Expected outcome:
- No hangs

Actual outcome:
- recovered GPU hangs and long pauses in Manhattan v3.1 output
- recovered GPU hangs and no output from Car Chase

Notes:
- I remember running these tests early this year using Mesa GL/GLSL overrides,
after CS was added for GLES, with *no* hangs i.e. this seems regression
- I get hangs also with Ubuntu's Mesa 11.2
- Hangs are compute shading related as I get hangs only with tests using CS
- SynMark CSDof tests has similar hangs, but CSCloth doesn't.  CSDof requires
SIMD32 for CS, but GfxBench tests and CSCloth don't

I tested also these kernels, but they didn't help:
- Ubuntu kernel 4.4.0-2 (Upstream 4.4 with i915 from same version)
- drm-intel-nightly kernel 4.6-rc4 (right after SKL PIPE_CONTROL fix)
- yesterday's drm-intel-nightly (4.7.0-pre)

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