[Bug 108712] Kernel code no longer counts EU correctly for i5-5250U (HD Graphics 6000 BroadWell U-Processor GT3)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108712

--- Comment #7 from gordon.lack at dsl.pipex.com ---
The commit I mentioned completely changed how the EUs were calculated (as far
as I can tell). It's the only change  I can see within 4.15 -> 4.18 time frame
that affects broadwell_sseu_info_init().

At 4.15 i915_sseu_status (in the debugfs file-system) reported:

SSEU Device Info
  Available Slice Mask: 0003
  Available Slice Total: 2
  Available Subslice Total: 6
  Available Subslice Mask: 0007
  Available Subslice Per Slice: 3
  Available EU Total: 48
  Available EU Per Subslice: 8
  Has Pooled EU: no
  Has Slice Power Gating: yes
  Has Subslice Power Gating: no
  Has EU Power Gating: no
SSEU Device Status
  Enabled Slice Mask: 0000
  Enabled Slice Total: 0
  Enabled Subslice Total: 0
  Enabled Subslice Mask: 0000
  Enabled Subslice Per Slice: 0
  Enabled EU Total: 0   
  Enabled EU Per Subslice: 0

whereas at 4.18 this becomes:
SSEU Device Info   
  Available Slice Mask: 0003
  Available Slice Total: 2
  Available Subslice Total: 6
  Available Slice0 subslices: 3
  Available Slice1 subslices: 3
  Available EU Total: 24
  Available EU Per Subslice: 4 
  Has Pooled EU: no
  Has Slice Power Gating: yes 
  Has Subslice Power Gating: no
  Has EU Power Gating: no
SSEU Device Status
  Enabled Slice Mask: 0003
  Enabled Slice Total: 2
  Enabled Subslice Total: 6
  Enabled Slice0 subslices: 3
  Enabled Slice1 subslices: 3
  Enabled EU Total: 24
  Enabled EU Per Subslice: 4

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