drm/i915/uc: Fail early if there is no GuC fw available

We don't want to rely on misleading WOPCM partitioning error.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190811195132.9660-2-michal.wajdeczko@intel.com

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

@@ -436,6 +436,11 @@ int intel_uc_init_hw(struct intel_uc *uc)
 	if (!intel_uc_supports_guc(uc))
 		return 0;
 
+	if (!intel_uc_fw_is_available(&guc->fw)) {
+		ret = intel_uc_fw_status_to_error(guc->fw.status);
+		goto err_out;
+	}
+
 	ret = uc_init_wopcm(uc);
 	if (ret)
 		goto err_out;

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h

@@ -107,6 +107,27 @@ const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status)
 	return "<invalid>";
 }
 
+static inline int intel_uc_fw_status_to_error(enum intel_uc_fw_status status)
+{
+	switch (status) {
+	case INTEL_UC_FIRMWARE_NOT_SUPPORTED:
+	case INTEL_UC_FIRMWARE_UNINITIALIZED:
+		return -EPERM;
+	case INTEL_UC_FIRMWARE_MISSING:
+		return -ENOENT;
+	case INTEL_UC_FIRMWARE_ERROR:
+		return -ENOEXEC;
+	case INTEL_UC_FIRMWARE_FAIL:
+		return -EIO;
+	case INTEL_UC_FIRMWARE_SELECTED:
+	case INTEL_UC_FIRMWARE_AVAILABLE:
+	case INTEL_UC_FIRMWARE_TRANSFERRED:
+	case INTEL_UC_FIRMWARE_RUNNING:
+		return 0;
+	}
+	return -EINVAL;
+}
+
 static inline const char *intel_uc_fw_type_repr(enum intel_uc_fw_type type)
 {
 	switch (type) {