[Intel-gfx] [PATCH 2/4] drm/i915: Only apply the mb() when flushing the GTT domain during a finish

[Chris Wilson]

Now that we seem to have brought order to the GTT barriers, the last one
to review is the terminal barrier before we unbind the buffer from the
GTT. This needs to only be performed if the buffer still resides in the
GTT domain, and so we can skip some needless barriers otherwise.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3c4577b..ed8d21a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2526,15 +2526,15 @@ static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
 {
 	u32 old_write_domain, old_read_domains;
 
-	/* Act a barrier for all accesses through the GTT */
-	mb();
-
 	/* Force a pagefault for domain tracking on next user access */
 	i915_gem_release_mmap(obj);
 
 	if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
 		return;
 
+	/* Wait for any direct GTT access to complete */
+	mb();
+
 	old_read_domains = obj->base.read_domains;
 	old_write_domain = obj->base.write_domain;
 
-- 
1.7.10.4