drm/i915/xehp: Don't support parallel submission on compute / render

A different emit breadcrumbs ring programming is required for compute /
render and we don't have UMD user so just reject parallel submission for
these engine classes.
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220301231549.1817978-11-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gem/i915_gem_context.c

@@ -670,6 +670,16 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base,
 				goto out_err;
 			}
 
+			/*
+			 * We don't support breadcrumb handshake on these
+			 * classes
+			 */
+			if (siblings[n]->class == RENDER_CLASS ||
+			    siblings[n]->class == COMPUTE_CLASS) {
+				err = -EINVAL;
+				goto out_err;
+			}
+
 			if (n) {
 				if (prev_engine.engine_class !=
 				    ci.engine_class) {

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

@@ -154,6 +154,10 @@ static int intel_guc_multi_lrc_basic(void *arg)
 	int ret;
 
 	for (class = 0; class < MAX_ENGINE_CLASS + 1; ++class) {
+		/* We don't support breadcrumb handshake on these classes */
+		if (class == COMPUTE_CLASS || class == RENDER_CLASS)
+			continue;
+
 		ret = __intel_guc_multi_lrc_basic(gt, class);
 		if (ret)
 			return ret;