[PATCH 01/28] drm/i915/guc: Don't allow GuC submission on pre-Gen11

[Michal Wajdeczko]

Due to the GuC interface changes, new firmware releases will
stop support GuC submission mode for pre-Gen11 platforms.
Sanitize the enable_guc option so that only HuC authentication
would be possible.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: John Spotswood <john.a.spotswood at intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
Cc: Tony Ye <tony.ye at intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Cc: Jeff Mcgee <jeff.mcgee at intel.com>
Cc: Antonio Argenziano <antonio.argenziano at intel.com>
Cc: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
---
 drivers/gpu/drm/i915/intel_uc.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 2d360d53757f..61d2a2910ef1 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -63,7 +63,9 @@ static int __get_platform_enable_guc(struct drm_i915_private *i915)
 	if (intel_uc_fw_is_selected(huc_fw))
 		enable_guc |= ENABLE_GUC_LOAD_HUC;
 
-	/* Any platform specific fine-tuning can be done here */
+	/* Don't allow GuC submission on pre-Gen11 */
+	if (INTEL_GEN(i915) < 11)
+		enable_guc &= ~ENABLE_GUC_SUBMISSION;
 
 	return enable_guc;
 }
@@ -116,6 +118,13 @@ static void sanitize_options_early(struct drm_i915_private *i915)
 			 yesno(intel_uc_is_using_guc_submission(i915)),
 			 yesno(intel_uc_is_using_huc(i915)));
 
+	/* Verify GuC submission support */
+	if (intel_uc_is_using_guc_submission(i915) && INTEL_GEN(i915) < 11) {
+		DRM_WARN("Incompatible option detected: %s=%d, %s!\n",
+			 "enable_guc", i915_modparams.enable_guc,
+			 "submission not supported");
+	}
+
 	/* Verify GuC firmware availability */
 	if (intel_uc_is_using_guc(i915) && !intel_uc_fw_is_selected(guc_fw)) {
 		DRM_WARN("Incompatible option detected: %s=%d, %s!\n",
@@ -288,6 +297,10 @@ int intel_uc_init(struct drm_i915_private *i915)
 	if (!HAS_GUC(i915))
 		return -ENODEV;
 
+	/* Don't allow GuC submission on pre-Gen11 */
+	if (USES_GUC_SUBMISSION(i915) && INTEL_GEN(i915) < 11)
+		return -EIO;
+
 	ret = intel_guc_init(guc);
 	if (ret)
 		return ret;
-- 
2.19.2