Patch "drm/i915: A hotfix for making aliasing PPGTT work for GVT-g" has been added to the 4.10-stable tree

Patch "drm/i915: A hotfix for making aliasing PPGTT work for GVT-g" has been added to the 4.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/i915: A hotfix for making aliasing PPGTT work for GVT-g

to the 4.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-a-hotfix-for-making-aliasing-ppgtt-work-for-gvt-g.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 3e52d71ede206df75b56208e7c7a277ef157bb71 Mon Sep 17 00:00:00 2001
From: Zhi Wang <zhi.a.wang@intel.com>
Date: Wed, 8 Feb 2017 21:03:33 +0800
Subject: drm/i915: A hotfix for making aliasing PPGTT work for GVT-g

From: Zhi Wang <zhi.a.wang@intel.com>

commit 3e52d71ede206df75b56208e7c7a277ef157bb71 upstream.

This patch makes PPGTT page table non-shrinkable when using aliasing PPGTT
mode. It's just a temporary solution for making GVT-g work.

Fixes: 2ce5179fe826 ("drm/i915/gtt: Free unused lower-level page tables")
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhiyuan Lv <zhiyuan.lv@intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1486559013-25251-2-git-send-email-zhi.a.wang@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit e81ecb5e31db6c2a259d694738cf620d9fa70861)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/i915_gem_gtt.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -735,9 +735,10 @@ static bool gen8_ppgtt_clear_pt(struct i
 	GEM_BUG_ON(pte_end > GEN8_PTES);
 
 	bitmap_clear(pt->used_ptes, pte, num_entries);
-
-	if (bitmap_empty(pt->used_ptes, GEN8_PTES))
-		return true;
+	if (USES_FULL_PPGTT(vm->i915)) {
+		if (bitmap_empty(pt->used_ptes, GEN8_PTES))
+			return true;
+	}
 
 	pt_vaddr = kmap_px(pt);
 


Patches currently in stable-queue which might be from zhi.a.wang@intel.com are

queue-4.10/drm-i915-let-execlist_update_context-cover-full_ppgtt-mode.patch
queue-4.10/drm-i915-move-the-release-of-pt-page-to-the-upper-caller.patch
queue-4.10/drm-i915-kvmgt-hold-struct-kvm-reference.patch
queue-4.10/drm-i915-a-hotfix-for-making-aliasing-ppgtt-work-for-gvt-g.patch