[PATCH 04/49] drm/i915/gt: Move the defer_request waiter active assertion

[Chris Wilson]

In defer_request() we start with the request we just unsubmitted (that
should be the active request on the gpu) and then defer all of its
waiters. No waiter should be ahead of the active request, so none should
be marked as active. That assert failed.

Of particular note this machine was undergoing persistent GPU result due
to underlying HW issues, so that may be a clue. A request is also marked
as active when it is retired, regardless of current queue status, and so
this assertion failure may be a result of the queue being completed by
the reset and then subsequently processed by the tasklet.

We can filter out retired requests here by doing the assertion check
after the is-ready check (active is a subset of being ready).

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2978
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_execlists_submission.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 24731be6e462..56e36d938851 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -1061,7 +1061,6 @@ static void defer_request(struct i915_request *rq, struct list_head * const pl)
 				   __i915_request_has_started(w) &&
 				   !__i915_request_is_complete(rq));
 
-			GEM_BUG_ON(i915_request_is_active(w));
 			if (!i915_request_is_ready(w))
 				continue;
 
@@ -1069,6 +1068,7 @@ static void defer_request(struct i915_request *rq, struct list_head * const pl)
 				continue;
 
 			GEM_BUG_ON(rq_prio(w) > rq_prio(rq));
+			GEM_BUG_ON(i915_request_is_active(w));
 			list_move_tail(&w->sched.link, &list);
 		}
 
-- 
2.20.1