Bay Trail PTE fixes

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Subject: Bay Trail PTE fixes
From: kenneth at whitecape.org (Kenneth Graunke)
Date: Thu, 18 Apr 2013 13:28:33 -0700

This refactors our PTE encoding functions, splitting them out into
per-generation functions.  Patch 2 fixes the page table entries for
the latest revision of Bay Trail, which is necessary to avoid GPU hangs.

I've tested these patches on Bay Trail and Haswell.  Not SNB/IVB.

Follow-Ups:
- Bay Trail PTE fixes
  - From: Ben Widawsky
- [PATCH 3/3] drm/i915: Split out Haswell code from gen6_pte_encode.
  - From: Kenneth Graunke
- [PATCH 2/3] drm/i915: Fix page table entries for Bay Trail.
  - From: Kenneth Graunke
- [PATCH 1/3] drm/i915: Add PTE encoding function to the gtt/ppgtt vtables.
  - From: Kenneth Graunke

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