drm/i915/breadcrumbs: Assert all missed breadcrumbs were signaled

When parking the engines and their breadcrumbs, if we have waiters left
then they missed their wakeup. Verify that each waiter's seqno did
complete.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180222092545.17216-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 03bbc1d..6a74061 100644 (file)
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -247,6 +247,8 @@ void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine)
        spin_unlock(&b->irq_lock);
 
        rbtree_postorder_for_each_entry_safe(wait, n, &b->waiters, node) {
+               GEM_BUG_ON(!i915_seqno_passed(intel_engine_get_seqno(engine),
+                                             wait->seqno));
                RB_CLEAR_NODE(&wait->node);
                wake_up_process(wait->tsk);
        }