drm/i915/guc: Don't allow GuC submission

Due to the upcoming changes to the GuC ABI interface, we must
disable GuC submission mode until final ABI will be available
on all GuC firmwares.

To avoid regressions on systems configured to run with no longer
supported configuration "enable_guc=3" or "enable_guc=1" clear
GuC submission bit.

v2: force switch to non-GuC submission mode
v3: use GEM_BUG_ON (Joonas)
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: John Spotswood <john.a.spotswood@intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Cc: Tony Ye <tony.ye@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Jeff Mcgee <jeff.mcgee@intel.com>
Cc: Antonio Argenziano <antonio.argenziano@intel.com>
Cc: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Cc: Martin Peres <martin.peres@linux.intel.com>
Acked-by: Martin Peres <martin.peres@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190527183613.17076-3-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/intel_uc.c

@@ -130,6 +130,15 @@ static void sanitize_options_early(struct drm_i915_private *i915)
 					  "no HuC firmware");
 	}
 
+	/* XXX: GuC submission is unavailable for now */
+	if (intel_uc_is_using_guc_submission(i915)) {
+		DRM_INFO("Incompatible option detected: %s=%d, %s!\n",
+			 "enable_guc", i915_modparams.enable_guc,
+			 "GuC submission not supported");
+		DRM_INFO("Switching to non-GuC submission mode!\n");
+		i915_modparams.enable_guc &= ~ENABLE_GUC_SUBMISSION;
+	}
+
 	/* A negative value means "use platform/config default" */
 	if (i915_modparams.guc_log_level < 0)
 		i915_modparams.guc_log_level =
@@ -298,6 +307,9 @@ int intel_uc_init(struct drm_i915_private *i915)
 	if (!HAS_GUC(i915))
 		return -ENODEV;
 
+	/* XXX: GuC submission is unavailable for now */
+	GEM_BUG_ON(USES_GUC_SUBMISSION(i915));
+
 	ret = intel_guc_init(guc);
 	if (ret)
 		return ret;