[Bug 103502] GPU HANG: ecode 3:0:0x7c9bf89c, in Xorg [781], reason: Hang on rcs0, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103502

--- Comment #6 from Luka Paunovic <internetfazoni at gmail.com> ---
(In reply to Chris Wilson from comment #3)
> commit 1d033beb20d6d5885587a02a393b6598d766a382
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Tue Oct 31 10:36:07 2017 +0000
> 
>     drm/i915: Check incoming alignment for unfenced buffers (on i915gm)
>     
>     In case the object has changed tiling between calls to execbuf, we need
>     to check if the existing offset inside the GTT matches the new tiling
>     constraint. We even need to do this for "unfenced" tiled objects, where
>     the 3D commands use an implied fence and so the object still needs to
>     match the physical fence restrictions on alignment (only required for
>     gen2 and early gen3).
>     
>     In commit 2889caa92321 ("drm/i915: Eliminate lots of iterations over
>     the execobjects array"), the idea was to remove the second guessing and
>     only set the NEEDS_MAP flag when required. However, the entire check
>     for an unusable offset for fencing was removed and not just the
>     secondary check. I.e.
>     
>             /* avoid costly ping-pong once a batch bo ended up non-mappable
> */
>             if (entry->flags & __EXEC_OBJECT_NEEDS_MAP &&
>                 !i915_vma_is_map_and_fenceable(vma))
>                     return !only_mappable_for_reloc(entry->flags);
>     
>     was entirely removed as the ping-pong between execbuf passes was fixed,
>     but its primary purpose in forcing unaligned unfenced access to be
>     rebound was forgotten.
>     
>     Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103502
>     Fixes: 2889caa92321 ("drm/i915: Eliminate lots of iterations over the
> execobjects array")
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
>     Link:
> https://patchwork.freedesktop.org/patch/msgid/20171031103607.17836-1-
> chris at chris-wilson.co.uk
>     Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

This is the FIX I was asking about how to apply :D 
I clicked the wrong reply button.

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