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@c... (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").