drm/i915/uc: Log fw status changes only under debug config

We don't care about internal firmware status changes unless
we are doing some real debugging. Note that our CI is not
using DRM_I915_DEBUG_GUC config by default so use it.

v2: protect against accidental overwrites (Chris)
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190813081559.23936-1-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c

@@ -157,10 +157,10 @@ int intel_guc_fw_upload(struct intel_guc *guc)
 	if (ret)
 		goto out;
 
-	guc->fw.status = INTEL_UC_FIRMWARE_RUNNING;
+	intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_RUNNING);
 	return 0;
 
 out:
-	guc->fw.status = INTEL_UC_FIRMWARE_FAIL;
+	intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_FAIL);
 	return ret;
 }

drivers/gpu/drm/i915/gt/uc/intel_huc.c

@@ -147,12 +147,12 @@ int intel_huc_auth(struct intel_huc *huc)
 		goto fail;
 	}
 
-	huc->fw.status = INTEL_UC_FIRMWARE_RUNNING;
+	intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_RUNNING);
 	return 0;
 
 fail:
 	i915_probe_error(gt->i915, "HuC: Authentication failed %d\n", ret);
-	huc->fw.status = INTEL_UC_FIRMWARE_FAIL;
+	intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_FAIL);
 	return ret;
 }
 

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c

@@ -11,6 +11,29 @@
 #include "intel_uc_fw_abi.h"
 #include "i915_drv.h"
 
+#ifdef CONFIG_DRM_I915_DEBUG_GUC
+static inline struct intel_gt *__uc_fw_to_gt(struct intel_uc_fw *uc_fw)
+{
+	GEM_BUG_ON(uc_fw->status == INTEL_UC_FIRMWARE_UNINITIALIZED);
+	if (uc_fw->type == INTEL_UC_FW_TYPE_GUC)
+		return container_of(uc_fw, struct intel_gt, uc.guc.fw);
+
+	GEM_BUG_ON(uc_fw->type != INTEL_UC_FW_TYPE_HUC);
+	return container_of(uc_fw, struct intel_gt, uc.huc.fw);
+}
+
+void intel_uc_fw_change_status(struct intel_uc_fw *uc_fw,
+			       enum intel_uc_fw_status status)
+{
+	uc_fw->__status =  status;
+	DRM_DEV_DEBUG_DRIVER(__uc_fw_to_gt(uc_fw)->i915->drm.dev,
+			     "%s firmware -> %s\n",
+			     intel_uc_fw_type_repr(uc_fw->type),
+			     status == INTEL_UC_FIRMWARE_SELECTED ?
+			     uc_fw->path : intel_uc_fw_status_repr(status));
+}
+#endif
+
 /*
  * List of required GuC and HuC binaries per-platform.
  * Must be ordered based on platform + revid, from newer to older.
@@ -183,10 +206,9 @@ void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
 		__uc_fw_user_override(uc_fw);
 	}
 
-	if (uc_fw->path && *uc_fw->path)
-		uc_fw->status = INTEL_UC_FIRMWARE_SELECTED;
-	else
-		uc_fw->status = INTEL_UC_FIRMWARE_NOT_SUPPORTED;
+	intel_uc_fw_change_status(uc_fw, uc_fw->path && *uc_fw->path ?
+				  INTEL_UC_FIRMWARE_SELECTED :
+				  INTEL_UC_FIRMWARE_NOT_SUPPORTED);
 }
 
 static void __force_fw_fetch_failures(struct intel_uc_fw *uc_fw,
@@ -343,20 +365,15 @@ int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 
 	uc_fw->obj = obj;
 	uc_fw->size = fw->size;
-	uc_fw->status = INTEL_UC_FIRMWARE_AVAILABLE;
-
-	DRM_DEV_DEBUG_DRIVER(dev, "%s firmware %s: %s\n",
-			     intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
-			     intel_uc_fw_status_repr(uc_fw->status));
+	intel_uc_fw_change_status(uc_fw, INTEL_UC_FIRMWARE_AVAILABLE);
 
 	release_firmware(fw);
 	return 0;
 
 fail:
-	if (err == -ENOENT)
-		uc_fw->status = INTEL_UC_FIRMWARE_MISSING;
-	else
-		uc_fw->status = INTEL_UC_FIRMWARE_ERROR;
+	intel_uc_fw_change_status(uc_fw, err == -ENOENT ?
+				  INTEL_UC_FIRMWARE_MISSING :
+				  INTEL_UC_FIRMWARE_ERROR);
 
 	dev_notice(dev, "%s firmware %s: fetch failed with error %d\n",
 		   intel_uc_fw_type_repr(uc_fw->type), uc_fw->path, err);
@@ -491,17 +508,14 @@ int intel_uc_fw_upload(struct intel_uc_fw *uc_fw, struct intel_gt *gt,
 	if (err)
 		goto fail;
 
-	uc_fw->status = INTEL_UC_FIRMWARE_TRANSFERRED;
-	DRM_DEV_DEBUG_DRIVER(gt->i915->drm.dev, "%s firmware %s: %s\n",
-			     intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
-			     intel_uc_fw_status_repr(uc_fw->status));
+	intel_uc_fw_change_status(uc_fw, INTEL_UC_FIRMWARE_TRANSFERRED);
 	return 0;
 
 fail:
 	i915_probe_error(gt->i915, "Failed to load %s firmware %s (%d)\n",
 			 intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
 			 err);
-	uc_fw->status = INTEL_UC_FIRMWARE_FAIL;
+	intel_uc_fw_change_status(uc_fw, INTEL_UC_FIRMWARE_FAIL);
 	return err;
 }
 
@@ -546,7 +560,7 @@ void intel_uc_fw_cleanup_fetch(struct intel_uc_fw *uc_fw)
 	if (obj)
 		i915_gem_object_put(obj);
 
-	uc_fw->status = INTEL_UC_FIRMWARE_SELECTED;
+	intel_uc_fw_change_status(uc_fw, INTEL_UC_FIRMWARE_SELECTED);
 }
 
 /**

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h

@@ -42,7 +42,10 @@ enum intel_uc_fw_type {
  */
 struct intel_uc_fw {
 	enum intel_uc_fw_type type;
-	enum intel_uc_fw_status status;
+	union {
+		const enum intel_uc_fw_status status;
+		enum intel_uc_fw_status __status; /* no accidental overwrites */
+	};
 	const char *path;
 	bool user_overridden;
 	size_t size;
@@ -62,6 +65,17 @@ struct intel_uc_fw {
 	u32 ucode_size;
 };
 
+#ifdef CONFIG_DRM_I915_DEBUG_GUC
+void intel_uc_fw_change_status(struct intel_uc_fw *uc_fw,
+			       enum intel_uc_fw_status status);
+#else
+static inline void intel_uc_fw_change_status(struct intel_uc_fw *uc_fw,
+					     enum intel_uc_fw_status status)
+{
+	uc_fw->__status = status;
+}
+#endif
+
 static inline
 const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status)
 {
@@ -156,7 +170,7 @@ static inline bool intel_uc_fw_is_overridden(const struct intel_uc_fw *uc_fw)
 static inline void intel_uc_fw_sanitize(struct intel_uc_fw *uc_fw)
 {
 	if (intel_uc_fw_is_loaded(uc_fw))
-		uc_fw->status = INTEL_UC_FIRMWARE_AVAILABLE;
+		intel_uc_fw_change_status(uc_fw, INTEL_UC_FIRMWARE_AVAILABLE);
 }
 
 /**

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -1474,8 +1474,8 @@ capture_uc_state(struct i915_gpu_state *error, struct compress *compress)
 	if (!error->device_info.has_gt_uc)
 		return;
 
-	error_uc->guc_fw = uc->guc.fw;
-	error_uc->huc_fw = uc->huc.fw;
+	memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
+	memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
 
 	/* Non-default firmware paths will be specified by the modparam.
 	 * As modparams are generally accesible from the userspace make