[PATCH v3 1/2] drm/i915/uc: Start preparing GuC/HuC for reset

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

Right after GPU reset there will be a small window of time during which
some of GuC/HuC fields will still show state before reset. Let's start
to fix that by sanitizing firmware status as we will use it shortly.

v2: s/reset_prepare/prepare_to_reset (Michel)
    don't forget about gem_sanitize path (Daniele)
v3: rebased

Suggested-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c    |  5 ++++-
 drivers/gpu/drm/i915/intel_guc.h   |  5 +++++
 drivers/gpu/drm/i915/intel_huc.h   |  5 +++++
 drivers/gpu/drm/i915/intel_uc.c    | 14 ++++++++++++++
 drivers/gpu/drm/i915/intel_uc.h    |  1 +
 drivers/gpu/drm/i915/intel_uc_fw.h |  6 ++++++
 6 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a5bd073..aedb17d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2981,6 +2981,7 @@ int i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
 	}
 
 	i915_gem_revoke_fences(dev_priv);
+	intel_uc_prepare_to_reset(dev_priv);
 
 	return err;
 }
@@ -4882,8 +4883,10 @@ void i915_gem_sanitize(struct drm_i915_private *i915)
 	 * it may impact the display and we are uncertain about the stability
 	 * of the reset, so this could be applied to even earlier gen.
 	 */
-	if (INTEL_GEN(i915) >= 5 && intel_has_gpu_reset(i915))
+	if (INTEL_GEN(i915) >= 5 && intel_has_gpu_reset(i915)) {
+		intel_uc_prepare_to_reset(i915);
 		WARN_ON(intel_gpu_reset(i915, ALL_ENGINES));
+	}
 }
 
 int i915_gem_suspend(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index b9424ac..bdb0777 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -132,4 +132,9 @@ static inline u32 guc_ggtt_offset(struct i915_vma *vma)
 struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size);
 u32 intel_guc_wopcm_size(struct drm_i915_private *dev_priv);
 
+static inline void intel_guc_prepare_to_reset(struct intel_guc *guc)
+{
+	intel_uc_fw_prepare_to_reset(&guc->fw);
+}
+
 #endif
diff --git a/drivers/gpu/drm/i915/intel_huc.h b/drivers/gpu/drm/i915/intel_huc.h
index 5d6e804..6f21424 100644
--- a/drivers/gpu/drm/i915/intel_huc.h
+++ b/drivers/gpu/drm/i915/intel_huc.h
@@ -38,4 +38,9 @@ struct intel_huc {
 void intel_huc_init_early(struct intel_huc *huc);
 int intel_huc_auth(struct intel_huc *huc);
 
+static inline void intel_huc_prepare_to_reset(struct intel_huc *huc)
+{
+	intel_uc_fw_prepare_to_reset(&huc->fw);
+}
+
 #endif
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index e5bf0d3..8a64ff5 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -490,3 +490,17 @@ int intel_uc_resume(struct drm_i915_private *i915)
 
 	return 0;
 }
+
+void intel_uc_prepare_to_reset(struct drm_i915_private *i915)
+{
+	struct intel_huc *huc = &i915->huc;
+	struct intel_guc *guc = &i915->guc;
+
+	if (!USES_GUC(i915))
+		return;
+
+	GEM_BUG_ON(!HAS_GUC(i915));
+
+	intel_huc_prepare_to_reset(huc);
+	intel_guc_prepare_to_reset(guc);
+}
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index f76d51d..182a2de 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -41,6 +41,7 @@
 void intel_uc_fini(struct drm_i915_private *dev_priv);
 int intel_uc_suspend(struct drm_i915_private *dev_priv);
 int intel_uc_resume(struct drm_i915_private *dev_priv);
+void intel_uc_prepare_to_reset(struct drm_i915_private *dev_priv);
 
 static inline bool intel_uc_is_using_guc(void)
 {
diff --git a/drivers/gpu/drm/i915/intel_uc_fw.h b/drivers/gpu/drm/i915/intel_uc_fw.h
index d5fd460..f1ee653 100644
--- a/drivers/gpu/drm/i915/intel_uc_fw.h
+++ b/drivers/gpu/drm/i915/intel_uc_fw.h
@@ -115,6 +115,12 @@ static inline bool intel_uc_fw_is_selected(struct intel_uc_fw *uc_fw)
 	return uc_fw->path != NULL;
 }
 
+static inline void intel_uc_fw_prepare_to_reset(struct intel_uc_fw *uc_fw)
+{
+	if (uc_fw->load_status == INTEL_UC_FIRMWARE_SUCCESS)
+		uc_fw->load_status = INTEL_UC_FIRMWARE_PENDING;
+}
+
 void intel_uc_fw_fetch(struct drm_i915_private *dev_priv,
 		       struct intel_uc_fw *uc_fw);
 int intel_uc_fw_upload(struct intel_uc_fw *uc_fw,
-- 
1.9.1

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