Re: FAILED: patch "[PATCH] drm/i915/gt: Fill all the unused space in the GGTT" failed to apply to 5.6-stable tree

[Sasha Levin <sashal@kernel.org>]

On Wed, Apr 15, 2020 at 01:35:39PM +0200, gregkh@linuxfoundation.org wrote:
>
>The patch below does not apply to the 5.6-stable tree.
>If someone wants it applied there, or to any other stable or longterm
>tree, then please email the backport, including the original git commit
>id to <stable@vger.kernel.org>.
>
>thanks,
>
>greg k-h
>
>------------------ original commit in Linus's tree ------------------
>
>From 0b72a251bf92ca2378530fa1f9b35a71830ab51c Mon Sep 17 00:00:00 2001
>From: Chris Wilson <chris@chris-wilson.co.uk>
>Date: Tue, 31 Mar 2020 16:23:48 +0100
>Subject: [PATCH] drm/i915/gt: Fill all the unused space in the GGTT
>
>When we allocate space in the GGTT we may have to allocate a larger
>region than will be populated by the object to accommodate fencing. Make
>sure that this space beyond the end of the buffer points safely into
>scratch space, in case the HW tries to access it anyway (e.g. fenced
>access to the last tile row).
>
>v2: Preemptively / conservatively guard gen6 ggtt as well.
>
>Reported-by: Imre Deak <imre.deak@intel.com>
>References: https://gitlab.freedesktop.org/drm/intel/-/issues/1554
>Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
>Cc: Matthew Auld <matthew.auld@intel.com>
>Cc: Imre Deak <imre.deak@intel.com>
>Cc: stable@vger.kernel.org
>Reviewed-by: Matthew Auld <matthew.auld@intel.com>
>Reviewed-by: Imre Deak <imre.deak@intel.com>
>Link: https://patchwork.freedesktop.org/patch/msgid/20200331152348.26946-1-chris@chris-wilson.co.uk
>(cherry picked from commit 4d6c18590870fbac1e65dde5e01e621c8e0ca096)
>Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

I've also grabbed 69edc390a542 ("drm/i915/ggtt: do not set bits 1-11 in
gen12 ptes").

-- 
Thanks,
Sasha