drm/xe: Fix xe_exec_queue_is_idle for parallel exec queues

Last little piece to support parallel exec queue is compute mode.
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_exec_queue.c

@@ -867,8 +867,17 @@ bool xe_exec_queue_ring_full(struct xe_exec_queue *q)
  */
 bool xe_exec_queue_is_idle(struct xe_exec_queue *q)
 {
-	if (XE_WARN_ON(xe_exec_queue_is_parallel(q)))
-		return false;
+	if (xe_exec_queue_is_parallel(q)) {
+		int i;
+
+		for (i = 0; i < q->width; ++i) {
+			if (xe_lrc_seqno(&q->lrc[i]) !=
+			    q->lrc[i].fence_ctx.next_seqno - 1)
+				return false;
+		}
+
+		return true;
+	}
 
 	return xe_lrc_seqno(&q->lrc[0]) ==
 		q->lrc[0].fence_ctx.next_seqno - 1;