[Bug 99947] [BDW] igt_ppgtt_lowlevel, GEM_BUG_ON(num_entries > pt->used_ptes)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99947

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit bf75d59eff679d2e2b7af5c6958a088f8a458f7a
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Feb 27 12:26:52 2017 +0000

    drm/i915: Only unwind the local pgtable layer if empty

    Only if we allocated the layer and the lower level failed should we
    remove this layer when unwinding. Otherwise we ignore the overlapping
    entries by overwriting the old layer with scratch.

    Fixes: c5d092a4293f ("drm/i915: Remove bitmap tracking for used-pml4")
    Fixes: e2b763caa6eb ("drm/i915: Remove bitmap tracking for used-pdpes")
    Reported-by: Matthew Auld <matthew.william.auld at gmail.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99947
    Testcase: igt/drv_selftest/live_gtt
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Matthew Auld <matthew.william.auld at gmail.com>
    Tested-by: Matthew Auld <matthew.auld at intel.com>
    Reviewed-by: Matthew Auld <matthew.auld at intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/20170227122654.27651-1-chris@chris-wilson.co.uk

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