drm/i915/dg2: setup HuC loading via GSC

The GSC will perform both the load and the authentication, so we just
need to check the auth bit after the GSC has replied.
Since we require the PXP module to load the HuC, the earliest we can
trigger the load is during the pxp_bind operation.

Note that GSC-loaded HuC survives GT reset, so we need to just mark it
as ready when we re-init the GT HW.

V2: move setting of HuC fw error state to the failure path of the HuC
auth function, so it covers both the legacy and new auth flows
V4:
1. Fix typo in the commit message
2. style fix in intel_huc_wait_for_auth_complete()

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220928004145.745803-11-daniele.ceraolospurio@intel.com

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c
index 9d6ab1e01639..4f246416db17 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c
@@ -3,9 +3,43 @@
  * Copyright © 2014-2019 Intel Corporation
  */
 
+#include "gt/intel_gsc.h"
 #include "gt/intel_gt.h"
+#include "intel_huc.h"
 #include "intel_huc_fw.h"
 #include "i915_drv.h"
+#include "pxp/intel_pxp_huc.h"
+
+int intel_huc_fw_load_and_auth_via_gsc(struct intel_huc *huc)
+{
+	int ret;
+
+	if (!intel_huc_is_loaded_by_gsc(huc))
+		return -ENODEV;
+
+	if (!intel_uc_fw_is_loadable(&huc->fw))
+		return -ENOEXEC;
+
+	/*
+	 * If we abort a suspend, HuC might still be loaded when the mei
+	 * component gets re-bound and this function called again. If so, just
+	 * mark the HuC as loaded.
+	 */
+	if (intel_huc_is_authenticated(huc)) {
+		intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_RUNNING);
+		return 0;
+	}
+
+	GEM_WARN_ON(intel_uc_fw_is_loaded(&huc->fw));
+
+	ret = intel_pxp_huc_load_and_auth(&huc_to_gt(huc)->pxp);
+	if (ret)
+		return ret;
+
+	intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_TRANSFERRED);
+
+	return intel_huc_wait_for_auth_complete(huc);
+}
 
 /**
  * intel_huc_fw_upload() - load HuC uCode to device via DMA transfer