[PATCH 12/20] drm/i915/uc: Introduce intel_uc_sanitize to initialize GuC/HuC reset state

[Sagar Arun Kamble]

In i915_reset/gem_sanitize, GPU will be reset and driver state about
GuC/HuC load status will be invalid. Hence, we mark both GuC/HuC as not
loaded/NONE.

v2: Rebase. This patch is moved earlier in the series to facilitate
handling suspend/resume changes for GuC in details.

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c |  4 ++++
 drivers/gpu/drm/i915/intel_uc.c | 18 ++++++++++++++++++
 drivers/gpu/drm/i915/intel_uc.h |  1 +
 3 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 4301d50..3f87bf1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2932,6 +2932,8 @@ int i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
 
 	i915_gem_revoke_fences(dev_priv);
 
+	intel_uc_sanitize(dev_priv);
+
 	return err;
 }
 
@@ -4614,6 +4616,8 @@ void i915_gem_sanitize(struct drm_i915_private *i915)
 		mutex_unlock(&i915->drm.struct_mutex);
 	}
 
+	intel_uc_sanitize(i915);
+
 	/*
 	 * If we inherit context state from the BIOS or earlier occupants
 	 * of the GPU, the GPU may be in an inconsistent state when we
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index fe62aa7..54fd324 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -315,3 +315,21 @@ void intel_uc_runtime_resume(struct drm_i915_private *dev_priv)
 {
 	intel_guc_resume(&dev_priv->guc);
 }
+
+/**
+ * intel_uc_sanitize() - Sanitize uC state.
+ * @dev_priv: i915 device private
+ *
+ * This function marks load_status as FIRMWARE_NONE and sanitizes state of
+ * other GuC tasks.
+ */
+void intel_uc_sanitize(struct drm_i915_private *dev_priv)
+{
+	struct intel_uc_fw *guc_fw = &dev_priv->guc.fw;
+	struct intel_uc_fw *huc_fw = &dev_priv->huc.fw;
+
+	if (i915_modparams.enable_guc_loading) {
+		guc_fw->load_status = INTEL_UC_FIRMWARE_NONE;
+		huc_fw->load_status = INTEL_UC_FIRMWARE_NONE;
+	}
+}
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index adec2c7..f45d619 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -38,5 +38,6 @@
 void intel_uc_resume(struct drm_i915_private *dev_priv);
 int intel_uc_runtime_suspend(struct drm_i915_private *dev_priv);
 void intel_uc_runtime_resume(struct drm_i915_private *dev_priv);
+void intel_uc_sanitize(struct drm_i915_private *dev_priv);
 
 #endif
-- 
1.9.1