[Bug 78246] [IVB/HSW ULT Regression]igt/gem_cs_prefetch costs long time to execute

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78246

Guo Jinxian <jinxianx.guo at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #2 from Guo Jinxian <jinxianx.guo at intel.com> ---
9403eb1064168ea7b47c5ccd04ec17b98ca9a0de is the first bad commit
commit 9403eb1064168ea7b47c5ccd04ec17b98ca9a0de
Author:     Chris Wilson <chris at chris-wilson.co.uk>
AuthorDate: Mon Mar 17 12:21:55 2014 +0000
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Fri Apr 25 16:18:01 2014 +0200


    drm/i915: Do not call retire_requests from wait_for_rendering

    A common issue we have is that retiring requests causes recursion
    through GTT manipulation or page table manipulation which we can only
    handle at very specific points. However, to maintain internal
    consistency (enforced through our sanity checks on write_domain at
    various points in the GEM object lifecycle) we do need to retire the
    object prior to marking it with a new write_domain, and also clear the
    write_domain for the implicit flush following a batch.

    Note that this then allows the unbound objects to still be on the active
    lists, and so care must be taken when removing objects from unbound lists
    (similar to the caveats we face processing the bound lists).

    v2: Fix i915_gem_shrink_all() to handle updated object lifetime rules,
    by refactoring it to call into __i915_gem_shrink().

    v3: Missed an object-retire prior to changing cache domains in
    i915_gem_object_set_cache_leve()

    v4: Rebase

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Tested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Reviewed-by: Brad Volkin <bradley.d.volkin at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 469c92ff9c22309ca81fa43a75c249c1112b69da
a036ee8486228ba2ddc646c607595011a31cdde7 M      drivers


Revert the commit, the case works well

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