[UR][L0] Explicitly mark timestamped events

This is a workaround for a case where L0 driver fails to retrieve a
timestamp but doesn't return an error. In such case, when event
profiling info is queried we check the timestamp value and assume the
event was not timestamped even though it was.
This scenario can happen on newer platform with not yet full driver
support.

Author: kswiecicki

unified-runtime/source/adapters/level_zero/event.cpp

@@ -531,7 +531,7 @@ ur_result_t urEventGetProfilingInfo(
   std::shared_lock<ur_shared_mutex> EventLock(Event->Mutex);
 
   // The event must either have profiling enabled or be recording timestamps.
-  bool isTimestampedEvent = Event->isTimestamped();
+  bool isTimestampedEvent = Event->IsTimestamped;
   if (!Event->isProfilingEnabled() && !isTimestampedEvent) {
     return UR_RESULT_ERROR_PROFILING_INFO_NOT_AVAILABLE;
   }
@@ -764,6 +764,9 @@ ur_result_t urEnqueueTimestampRecordingExp(
       Device, &DeviceStartTimestamp, nullptr));
   (*OutEvent)->RecordEventStartTimestamp = DeviceStartTimestamp;
 
+  // Mark this event as timestamped
+  (*OutEvent)->IsTimestamped = true;
+
   // Create a new entry in the queue's recordings.
   Queue->EndTimeRecordings[*OutEvent] = 0;
 
@@ -1141,7 +1144,7 @@ ur_result_t urEventReleaseInternal(ur_event_handle_t Event,
 
   // If the event was a timestamp recording, we try to evict its entry in the
   // queue.
-  if (Event->isTimestamped()) {
+  if (Event->IsTimestamped) {
     auto Entry = Queue->EndTimeRecordings.find(Event);
     if (Entry != Queue->EndTimeRecordings.end()) {
       auto &EndTimeRecording = Entry->second;
@@ -1435,6 +1438,7 @@ ur_result_t ur_event_handle_t_::reset() {
   CommandList = std::nullopt;
   completionBatch = std::nullopt;
   OriginAllocEvent = nullptr;
+  IsTimestamped = false;
 
   if (!isHostVisible())
     HostVisibleEvent = nullptr;
@@ -1767,12 +1771,3 @@ bool ur_event_handle_t_::isProfilingEnabled() const {
   return !UrQueue || // tentatively assume user events are profiling enabled
          (UrQueue->Properties & UR_QUEUE_FLAG_PROFILING_ENABLE) != 0;
 }
-
-// Tells if this event was created as a timestamp event, allowing profiling
-// info even if profiling is not enabled.
-bool ur_event_handle_t_::isTimestamped() const {
-  // If we are recording, the start time of the event will be non-zero. The
-  // end time might still be missing, depending on whether the corresponding
-  // enqueue is still running.
-  return RecordEventStartTimestamp != 0;
-}

unified-runtime/source/adapters/level_zero/event.hpp

@@ -200,6 +200,9 @@ struct ur_event_handle_t_ : ur_object {
   // plugin.
   bool IsDiscarded = {false};
 
+  // Indicates that this is a timestamped event.
+  bool IsTimestamped = {false};
+
   // Indicates that this event is needed to be visible by multiple devices.
   // When possible, allocate Event from single device pool for optimal
   // performance
@@ -246,10 +249,6 @@ struct ur_event_handle_t_ : ur_object {
   // Tells if this event is with profiling capabilities.
   bool isProfilingEnabled() const;
 
-  // Tells if this event was created as a timestamp event, allowing profiling
-  // info even if profiling is not enabled.
-  bool isTimestamped() const;
-
   // Get the host-visible event or create one and enqueue its signal.
   ur_result_t getOrCreateHostVisibleEvent(ze_event_handle_t &HostVisibleEvent);