[Intel-gfx] [PATCH] drm/i915: Serialise the bound vma prior to suspend

[Chris Wilson]

Make sure that all the vma are bound and PTE writes are finished before
we zap them for suspend.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_ggtt.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 79096722ce16..4597f6010c3a 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -106,20 +106,15 @@ static bool needs_idle_maps(struct drm_i915_private *i915)
 
 static void ggtt_suspend_mappings(struct i915_ggtt *ggtt)
 {
-	struct drm_i915_private *i915 = ggtt->vm.i915;
-
-	/*
-	 * Don't bother messing with faults pre GEN6 as we have little
-	 * documentation supporting that it's a good idea.
-	 */
-	if (INTEL_GEN(i915) < 6)
-		return;
+	struct i915_vma *vma;
 
-	intel_gt_check_and_clear_faults(ggtt->vm.gt);
+	list_for_each_entry(vma, &ggtt->vm.bound_list, vm_link)
+		i915_vma_sync(vma);
 
 	ggtt->vm.clear_range(&ggtt->vm, 0, ggtt->vm.total);
-
 	ggtt->invalidate(ggtt);
+
+	intel_gt_check_and_clear_faults(ggtt->vm.gt);
 }
 
 void i915_gem_suspend_gtt_mappings(struct drm_i915_private *i915)
@@ -1188,8 +1183,6 @@ static void ggtt_restore_mappings(struct i915_ggtt *ggtt)
 
 	intel_gt_check_and_clear_faults(ggtt->vm.gt);
 
-	mutex_lock(&ggtt->vm.mutex);
-
 	/* First fill our portion of the GTT with scratch pages */
 	ggtt->vm.clear_range(&ggtt->vm, 0, ggtt->vm.total);
 
@@ -1216,8 +1209,6 @@ static void ggtt_restore_mappings(struct i915_ggtt *ggtt)
 	atomic_set(&ggtt->vm.open, open);
 	ggtt->invalidate(ggtt);
 
-	mutex_unlock(&ggtt->vm.mutex);
-
 	if (flush)
 		wbinvd_on_all_cpus();
 }
-- 
2.25.0