linux-kernel - [PATCH 4.10 81/81] drm/i915: A hotfix for making aliasing PPGTT work for GVT-g

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Date:   Thu,  6 Apr 2017 10:39:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Michal Winiarski <michal.winiarski@...el.com>,
        Michel Thierry <michel.thierry@...el.com>,
        Mika Kuoppala <mika.kuoppala@...el.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhiyuan Lv <zhiyuan.lv@...el.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH 4.10 81/81] drm/i915: A hotfix for making aliasing PPGTT work for GVT-g

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhi Wang <zhi.a.wang@...el.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@...ux.intel.com>
Cc: Michal Winiarski <michal.winiarski@...el.com>
Cc: Michel Thierry <michel.thierry@...el.com>
Cc: Mika Kuoppala <mika.kuoppala@...el.com>
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@...el.com>
Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc: Zhiyuan Lv <zhiyuan.lv@...el.com>
Signed-off-by: Zhi Wang <zhi.a.wang@...el.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1486559013-25251-2-git-send-email-zhi.a.wang@intel.com
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
(cherry picked from commit e81ecb5e31db6c2a259d694738cf620d9fa70861)
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);