drm/i915/guc: Don't send policy update for child contexts.

The GuC FW applies the parent context policy to all the children,
so individual updates to the children are not supported and we
should not send them.

Note that sending the message did not have any functional consequences,
because the GuC just drops it and logs an error; since we were trying
to set the child policy to match the parent anyway the message being
dropped was not a problem.
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: John Harrison <john.c.harrison@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220728003339.2361010-1-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

@@ -2420,7 +2420,6 @@ static int guc_context_policy_init_v70(struct intel_context *ce, bool loop)
 	struct context_policy policy;
 	u32 execution_quantum;
 	u32 preemption_timeout;
-	bool missing = false;
 	unsigned long flags;
 	int ret;
 
@@ -2438,32 +2437,9 @@ static int guc_context_policy_init_v70(struct intel_context *ce, bool loop)
 		__guc_context_policy_add_preempt_to_idle(&policy, 1);
 
 	ret = __guc_context_set_context_policies(guc, &policy, loop);
-	missing = ret != 0;
-
-	if (!missing && intel_context_is_parent(ce)) {
-		struct intel_context *child;
-
-		for_each_child(ce, child) {
-			__guc_context_policy_start_klv(&policy, child->guc_id.id);
-
-			if (engine->flags & I915_ENGINE_WANT_FORCED_PREEMPTION)
-				__guc_context_policy_add_preempt_to_idle(&policy, 1);
-
-			child->guc_state.prio = ce->guc_state.prio;
-			__guc_context_policy_add_priority(&policy, ce->guc_state.prio);
-			__guc_context_policy_add_execution_quantum(&policy, execution_quantum);
-			__guc_context_policy_add_preemption_timeout(&policy, preemption_timeout);
-
-			ret = __guc_context_set_context_policies(guc, &policy, loop);
-			if (ret) {
-				missing = true;
-				break;
-			}
-		}
-	}
 
 	spin_lock_irqsave(&ce->guc_state.lock, flags);
-	if (missing)
+	if (ret != 0)
 		set_context_policy_required(ce);
 	else
 		clr_context_policy_required(ce);