[Intel-gfx] [PATCH] drm/i915/uc: Add function to define defaults for GuC/HuC enable

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

There is a module parameter for controlling what GuC/HuC features are
enabled. Setting to -1 means 'use the default'. However, the default
is not well defined, out of date and needs to be different across
platforms.

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
CC: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_uc.c    | 28 ++++++++++++++++++++++--
 drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c |  7 +-----
 drivers/gpu/drm/i915/i915_params.h       |  1 +
 3 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 6a0452815c41..2c08db58cf12 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -15,6 +15,29 @@
 static const struct intel_uc_ops uc_ops_off;
 static const struct intel_uc_ops uc_ops_on;
 
+static void uc_expand_default_options(struct intel_uc *uc)
+{
+	struct drm_i915_private *i915 = uc_to_gt(uc)->i915;
+
+	if (i915->params.enable_guc != -1)
+		return;
+
+	/* Don't enable GuC/HuC on pre-Gen12 */
+	if (INTEL_GEN(i915) < 12) {
+		i915->params.enable_guc = 0;
+		return;
+	}
+
+	/* Don't enable GuC/HuC on older Gen12 platforms */
+	if (IS_TIGERLAKE(i915) || IS_ROCKETLAKE(i915)) {
+		i915->params.enable_guc = 0;
+		return;
+	}
+
+	/* Default: enable HuC authentication only */
+	i915->params.enable_guc = ENABLE_GUC_LOAD_HUC;
+}
+
 /* Reset GuC providing us with fresh state for both GuC and HuC.
  */
 static int __intel_uc_reset_hw(struct intel_uc *uc)
@@ -79,8 +102,7 @@ static void __confirm_options(struct intel_uc *uc)
 			 "Incompatible option enable_guc=%d - %s\n",
 			 i915->params.enable_guc, "GuC submission is N/A");
 
-	if (i915->params.enable_guc & ~(ENABLE_GUC_SUBMISSION |
-					  ENABLE_GUC_LOAD_HUC))
+	if (i915->params.enable_guc & ~ENABLE_GUC_MASK)
 		drm_info(&i915->drm,
 			 "Incompatible option enable_guc=%d - %s\n",
 			 i915->params.enable_guc, "undocumented flag");
@@ -88,6 +110,8 @@ static void __confirm_options(struct intel_uc *uc)
 
 void intel_uc_init_early(struct intel_uc *uc)
 {
+	uc_expand_default_options(uc);
+
 	intel_guc_init_early(&uc->guc);
 	intel_huc_init_early(&uc->huc);
 
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index 602f1a0bc587..67b06fde1225 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -152,16 +152,11 @@ __uc_fw_auto_select(struct drm_i915_private *i915, struct intel_uc_fw *uc_fw)
 			uc_fw->path = NULL;
 		}
 	}
-
-	/* We don't want to enable GuC/HuC on pre-Gen11 by default */
-	if (i915->params.enable_guc == -1 && p < INTEL_ICELAKE)
-		uc_fw->path = NULL;
 }
 
 static const char *__override_guc_firmware_path(struct drm_i915_private *i915)
 {
-	if (i915->params.enable_guc & (ENABLE_GUC_SUBMISSION |
-				       ENABLE_GUC_LOAD_HUC))
+	if (i915->params.enable_guc & ENABLE_GUC_MASK)
 		return i915->params.guc_firmware_path;
 	return "";
 }
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 330c03e2b4f7..f031966af5b7 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -32,6 +32,7 @@ struct drm_printer;
 
 #define ENABLE_GUC_SUBMISSION		BIT(0)
 #define ENABLE_GUC_LOAD_HUC		BIT(1)
+#define ENABLE_GUC_MASK			GENMASK(1, 0)
 
 /*
  * Invoke param, a function-like macro, for each i915 param, with arguments:
-- 
2.25.1