From 7a90f89904afe66ff029bd784679aa293baacb72 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 13 Dec 2019 22:31:40 +0000 Subject: [PATCH] drm/i915/gem: Serialise object before changing cache-level Wait for the object to be idle before changing its cache-level and unbinding. This was dropped as supposedly superfluous from commit 8b1c78e06e61 ("drm/i915: Avoid calling i915_gem_object_unbind holding object lock"), but it turns out to prevent some cache dirt escaping. Smells like papering over a race... Closes: https://gitlab.freedesktop.org/drm/intel/issues/820 Fixes: 8b1c78e06e61 ("drm/i915: Avoid calling i915_gem_object_unbind holding object lock") Signed-off-by: Chris Wilson Cc: Andi Shyti Acked-by: Andi Shyti Link: https://patchwork.freedesktop.org/patch/msgid/20191213223140.1830738-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gem/i915_gem_domain.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c index 88ab7e71f36c..65f1851e2863 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c @@ -190,6 +190,13 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj, if (obj->cache_level == cache_level) return 0; + ret = i915_gem_object_wait(obj, + I915_WAIT_INTERRUPTIBLE | + I915_WAIT_ALL, + MAX_SCHEDULE_TIMEOUT); + if (ret) + return ret; + ret = i915_gem_object_lock_interruptible(obj); if (ret) return ret; -- 2.30.2