drm/i915/uc: Sanitize uC together with GEM

Instead of dancing around uC on reset/suspend/resume scenarios,
explicitly sanitize uC when we sanitize GEM to force uC reload
and start from known beginning.

v2: don't forget about reset path (Daniele)
    sanitize uc before gem initiated full reset (Daniele)
v3: drop redundant disable_communication in init_hw (Daniele)

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>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180312130308.22952-3-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/i915_gem.c

@@ -2998,6 +2998,7 @@ int i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
 	}
 
 	i915_gem_revoke_fences(dev_priv);
+	intel_uc_sanitize(dev_priv);
 
 	return err;
 }
@@ -4978,6 +4979,7 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 	 * machines is a good idea, we don't - just in case it leaves the
 	 * machine in an unusable condition.
 	 */
+	intel_uc_sanitize(dev_priv);
 	i915_gem_sanitize(dev_priv);
 
 	intel_runtime_pm_put(dev_priv);

drivers/gpu/drm/i915/intel_guc.h

@@ -133,4 +133,10 @@ int intel_guc_resume(struct intel_guc *guc);
 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 int intel_guc_sanitize(struct intel_guc *guc)
+{
+	intel_uc_fw_sanitize(&guc->fw);
+	return 0;
+}
+
 #endif

drivers/gpu/drm/i915/intel_huc.h

@@ -38,4 +38,10 @@ struct intel_huc {
 void intel_huc_init_early(struct intel_huc *huc);
 int intel_huc_auth(struct intel_huc *huc);
 
+static inline int intel_huc_sanitize(struct intel_huc *huc)
+{
+	intel_uc_fw_sanitize(&huc->fw);
+	return 0;
+}
+
 #endif

drivers/gpu/drm/i915/intel_uc.c

@@ -334,6 +334,24 @@ void intel_uc_fini(struct drm_i915_private *dev_priv)
 	intel_guc_fini(guc);
 }
 
+void intel_uc_sanitize(struct drm_i915_private *i915)
+{
+	struct intel_guc *guc = &i915->guc;
+	struct intel_huc *huc = &i915->huc;
+
+	if (!USES_GUC(i915))
+		return;
+
+	GEM_BUG_ON(!HAS_GUC(i915));
+
+	guc_disable_communication(guc);
+
+	intel_huc_sanitize(huc);
+	intel_guc_sanitize(guc);
+
+	__intel_uc_reset_hw(i915);
+}
+
 int intel_uc_init_hw(struct drm_i915_private *dev_priv)
 {
 	struct intel_guc *guc = &dev_priv->guc;
@@ -345,7 +363,6 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
 
 	GEM_BUG_ON(!HAS_GUC(dev_priv));
 
-	guc_disable_communication(guc);
 	gen9_reset_guc_interrupts(dev_priv);
 
 	/* init WOPCM */

drivers/gpu/drm/i915/intel_uc.h

@@ -36,6 +36,7 @@ void intel_uc_init_fw(struct drm_i915_private *dev_priv);
 void intel_uc_fini_fw(struct drm_i915_private *dev_priv);
 int intel_uc_init_misc(struct drm_i915_private *dev_priv);
 void intel_uc_fini_misc(struct drm_i915_private *dev_priv);
+void intel_uc_sanitize(struct drm_i915_private *dev_priv);
 int intel_uc_init_hw(struct drm_i915_private *dev_priv);
 void intel_uc_fini_hw(struct drm_i915_private *dev_priv);
 int intel_uc_init(struct drm_i915_private *dev_priv);

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_sanitize(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,