drm/i915/uc: HuC firmware can't be supported without GuC

There is no point in selecting HuC firmware if GuC is unsupported
or it was already disabled, as we need GuC to authenticate HuC.

While around, make uc_fw_init_early work without direct access
to whole i915, pass only needed platform/rev info.
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/20190807170034.8440-3-michal.wajdeczko@intel.com

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

@@ -39,7 +39,10 @@
  */
 void intel_guc_fw_init_early(struct intel_guc *guc)
 {
-	intel_uc_fw_init_early(&guc->fw, INTEL_UC_FW_TYPE_GUC, guc_to_gt(guc)->i915);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+
+	intel_uc_fw_init_early(&guc->fw, INTEL_UC_FW_TYPE_GUC, HAS_GT_UC(i915),
+			       INTEL_INFO(i915)->platform, INTEL_REVID(i915));
 }
 
 static void guc_prepare_xfer(struct intel_uncore *uncore)

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

@@ -31,7 +31,13 @@
  */
 void intel_huc_fw_init_early(struct intel_huc *huc)
 {
-	intel_uc_fw_init_early(&huc->fw, INTEL_UC_FW_TYPE_HUC, huc_to_gt(huc)->i915);
+	struct intel_gt *gt = huc_to_gt(huc);
+	struct intel_uc *uc = &gt->uc;
+	struct drm_i915_private *i915 = gt->i915;
+
+	intel_uc_fw_init_early(&huc->fw, INTEL_UC_FW_TYPE_HUC,
+			       intel_uc_supports_guc(uc),
+			       INTEL_INFO(i915)->platform, INTEL_REVID(i915));
 }
 
 /**

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

@@ -171,16 +171,18 @@ __uc_fw_override(struct intel_uc_fw *uc_fw)
 
 /**
  * intel_uc_fw_init_early - initialize the uC object and select the firmware
- * @i915: device private
  * @uc_fw: uC firmware
  * @type: type of uC
+ * @supported: is uC support possible
+ * @platform: platform identifier
+ * @rev: hardware revision
  *
  * Initialize the state of our uC object and relevant tracking and select the
  * firmware to fetch and load.
  */
 void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
-			    enum intel_uc_fw_type type,
-			    struct drm_i915_private *i915)
+			    enum intel_uc_fw_type type, bool supported,
+			    enum intel_platform platform, u8 rev)
 {
 	/*
 	 * we use FIRMWARE_UNINITIALIZED to detect checks against uc_fw->status
@@ -192,9 +194,8 @@ void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
 
 	uc_fw->type = type;
 
-	if (HAS_GT_UC(i915) && likely(!__uc_fw_override(uc_fw)))
-		__uc_fw_auto_select(uc_fw, INTEL_INFO(i915)->platform,
-				    INTEL_REVID(i915));
+	if (supported && likely(!__uc_fw_override(uc_fw)))
+		__uc_fw_auto_select(uc_fw, platform, rev);
 
 	if (uc_fw->path && *uc_fw->path)
 		uc_fw->status = INTEL_UC_FIRMWARE_SELECTED;

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

@@ -27,6 +27,7 @@
 
 #include <linux/types.h>
 #include "intel_uc_fw_abi.h"
+#include "intel_device_info.h"
 #include "i915_gem.h"
 
 struct drm_printer;
@@ -170,8 +171,8 @@ static inline u32 intel_uc_fw_get_upload_size(struct intel_uc_fw *uc_fw)
 }
 
 void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
-			    enum intel_uc_fw_type type,
-			    struct drm_i915_private *i915);
+			    enum intel_uc_fw_type type, bool supported,
+			    enum intel_platform platform, u8 rev);
 void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw,
 		       struct drm_i915_private *i915);
 void intel_uc_fw_cleanup_fetch(struct intel_uc_fw *uc_fw);