[Bug 107280] [DXVK] Batman: Arkham City with tessellation enabled hangs on SKL GT4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107280

            Bug ID: 107280
           Summary: [DXVK] Batman: Arkham City with tessellation enabled
                    hangs on SKL GT4
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: jason at jlekstrand.net
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net

This seems to only happen on SKL GT4.  I've tried on BDW and on SKL GT3 and
both are fine.  There are a number of different driver hacks that all make the
hang go away:

 1. Decrease the total URB size to 900 or less in gen_get_l3_config_urb_size()
 2. Increase the number of URB slots per VUE requested for vertex shaders by 2
(done in emit_urb_setup in genX_pipeline.c)
 3. Divide the number of URB entries by 2 when emitting the 3DSTATE_URB_*
packets.
 4. Disable the vertex cache in 3DSTATE_VS

There are also a number of tessellation errors that seem to have to do with the
tessellation level of detail.  Some of the above hacks not only fix the hang
but also get things tessellating at the correct LOD.  There is also a
tessellation issue in the last scene of the benchmark where the lion and the
buildings are not properly tessellated.  None of the above hacks fix that
issue.

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