From 2797c4a11f373b2545c2398ccb02e362ee66a142 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 4 Dec 2017 13:25:13 +0000
Subject: [PATCH] drm/i915: Flush pending GTT writes before unbinding
Git-commit: 2797c4a11f373b2545c2398ccb02e362ee66a142
Patch-mainline: v4.15-rc5
References: FATE#322643 bsc#1055900
No-fix: 5888fc9eac3c2ff96e76aeeb865fdb46ab2d711e
From the shrinker paths, we want to relinquish the GPU and GGTT access to
the object, releasing the backing storage back to the system for
swapout. As a part of that process we would unpin the pages, marking
them for access by the CPU (for the swapout/swapin). However, if that
process was interrupted after unbind the vma, we missed a flush of the
inflight GGTT writes before we made that GTT space available again for
reuse, with the prospect that we would redirect them to another page.
The bug dates back to the introduction of multiple GGTT vma, but the
code itself dates to commit 02bef8f98d26 ("drm/i915: Unbind closed vma
for i915_gem_object_unbind()").
Fixes: 02bef8f98d26 ("drm/i915: Unbind closed vma for i915_gem_object_unbind()")
Fixes: c5ad54cf7dd8 ("drm/i915: Use partial view in mmap fault handler")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171204132513.7303-1-chris@chris-wilson.co.uk
(cherry picked from commit 5888fc9eac3c2ff96e76aeeb865fdb46ab2d711e)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/i915_gem.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -330,17 +330,10 @@ int i915_gem_object_unbind(struct drm_i9
* must wait for all rendering to complete to the object (as unbinding
* must anyway), and retire the requests.
*/
- ret = i915_gem_object_wait(obj,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED |
- I915_WAIT_ALL,
- MAX_SCHEDULE_TIMEOUT,
- NULL);
+ ret = i915_gem_object_set_to_cpu_domain(obj, false);
if (ret)
return ret;
- i915_gem_retire_requests(to_i915(obj->base.dev));
-
while ((vma = list_first_entry_or_null(&obj->vma_list,
struct i915_vma,
obj_link))) {