[Intel-gfx] [PATCH v2] drm/i915: add schedule out notification of preempted but completed request

[Weinan Li]

There is one corner case missing schedule out notification of the preempted
request. The preempted request is just completed when preemption happen,
then it will be canceled and won't be resubmitted later, GVT-g will lost
the schedule out notification.

Here add schedule out notification if found the preempted request has been
completed.

v2:
- refine description, add completed check and notification in
  execlists_cancel_port_requests. (Chris)

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Weinan Li <weinan.z.li at intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index e781c91..24a6e68 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -657,10 +657,16 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
 
 	while (num_ports-- && port_isset(port)) {
 		struct i915_request *rq = port_request(port);
+		unsigned int notify;
 
 		GEM_BUG_ON(!execlists->active);
 		intel_engine_context_out(rq->engine);
-		execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_PREEMPTED);
+
+		notify = INTEL_CONTEXT_SCHEDULE_PREEMPTED;
+		if (i915_request_completed(rq))
+			notify = INTEL_CONTEXT_SCHEDULE_OUT;
+		execlists_context_status_change(rq, notify);
+
 		i915_request_put(rq);
 
 		memset(port, 0, sizeof(*port));
-- 
1.9.1