drm/i915/guc: Don't try to enable GuC logging when we're not using GuC

When changing the default values for guc_log_level, we accidentally left
the log enabled on non-guc platforms. Let's fix that.

v2: Define the levels used and remove (now obsolete) comments (Chris)
v3: Use "IS" rather than "TO" for booleans (Chris)

Fixes: 9605d1ce ("drm/i915/guc: Default to non-verbose GuC logging")
Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
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/20180320115517.20423-1-michal.winiarski@intel.com

drivers/gpu/drm/i915/intel_guc.c

@@ -229,10 +229,10 @@ static u32 get_log_control_flags(void)
 
 	GEM_BUG_ON(level < 0);
 
-	if (!GUC_LOG_LEVEL_TO_ENABLED(level))
+	if (!GUC_LOG_LEVEL_IS_ENABLED(level))
 		flags |= GUC_LOG_DEFAULT_DISABLED;
 
-	if (!GUC_LOG_LEVEL_TO_VERBOSE(level))
+	if (!GUC_LOG_LEVEL_IS_VERBOSE(level))
 		flags |= GUC_LOG_DISABLED;
 	else
 		flags |= GUC_LOG_LEVEL_TO_VERBOSITY(level) <<

drivers/gpu/drm/i915/intel_guc_log.c

@@ -515,8 +515,7 @@ int intel_guc_log_level_set(struct intel_guc_log *log, u64 val)
 	 * GuC is recognizing log levels starting from 0 to max, we're using 0
 	 * as indication that logging should be disabled.
 	 */
-	if (val < GUC_LOG_LEVEL_DISABLED ||
-	    val > GUC_VERBOSITY_TO_LOG_LEVEL(GUC_LOG_VERBOSITY_MAX))
+	if (val < GUC_LOG_LEVEL_DISABLED || val > GUC_LOG_LEVEL_MAX)
 		return -EINVAL;
 
 	mutex_lock(&dev_priv->drm.struct_mutex);
@@ -527,8 +526,8 @@ int intel_guc_log_level_set(struct intel_guc_log *log, u64 val)
 	}
 
 	intel_runtime_pm_get(dev_priv);
-	ret = guc_log_control(guc, GUC_LOG_LEVEL_TO_VERBOSE(val),
-			      GUC_LOG_LEVEL_TO_ENABLED(val),
+	ret = guc_log_control(guc, GUC_LOG_LEVEL_IS_VERBOSE(val),
+			      GUC_LOG_LEVEL_IS_ENABLED(val),
 			      GUC_LOG_LEVEL_TO_VERBOSITY(val));
 	intel_runtime_pm_put(dev_priv);
 	if (ret) {

drivers/gpu/drm/i915/intel_guc_log.h

@@ -46,14 +46,16 @@ struct intel_guc;
  * log enabling, and separate bit for default logging - which "conveniently"
  * ignores the enable bit.
  */
-#define GUC_LOG_LEVEL_DISABLED			0
-#define GUC_LOG_LEVEL_TO_ENABLED(x)		((x) > 0)
-#define GUC_LOG_LEVEL_TO_VERBOSE(x)		((x) > 1)
+#define GUC_LOG_LEVEL_DISABLED		0
+#define GUC_LOG_LEVEL_NON_VERBOSE	1
+#define GUC_LOG_LEVEL_IS_ENABLED(x)	((x) > GUC_LOG_LEVEL_DISABLED)
+#define GUC_LOG_LEVEL_IS_VERBOSE(x)	((x) > GUC_LOG_LEVEL_NON_VERBOSE)
 #define GUC_LOG_LEVEL_TO_VERBOSITY(x) ({		\
 	typeof(x) _x = (x);				\
-	GUC_LOG_LEVEL_TO_VERBOSE(_x) ? _x - 2 : 0;	\
+	GUC_LOG_LEVEL_IS_VERBOSE(_x) ? _x - 2 : 0;	\
 })
-#define GUC_VERBOSITY_TO_LOG_LEVEL(x)		((x) + 2)
+#define GUC_VERBOSITY_TO_LOG_LEVEL(x)	((x) + 2)
+#define GUC_LOG_LEVEL_MAX GUC_VERBOSITY_TO_LOG_LEVEL(GUC_LOG_VERBOSITY_MAX)
 
 struct intel_guc_log {
 	u32 flags;

drivers/gpu/drm/i915/intel_uc.c

@@ -69,14 +69,15 @@ static int __get_platform_enable_guc(struct drm_i915_private *dev_priv)
 
 static int __get_default_guc_log_level(struct drm_i915_private *dev_priv)
 {
-	int guc_log_level = 1; /* non-verbose */
+	int guc_log_level;
 
-	/* Enable if we're running on platform with GuC and debug config */
-	if (HAS_GUC(dev_priv) && intel_uc_is_using_guc() &&
-	    (IS_ENABLED(CONFIG_DRM_I915_DEBUG) ||
-	     IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)))
-		guc_log_level =
-			GUC_VERBOSITY_TO_LOG_LEVEL(GUC_LOG_VERBOSITY_MAX);
+	if (!HAS_GUC(dev_priv) || !intel_uc_is_using_guc())
+		guc_log_level = GUC_LOG_LEVEL_DISABLED;
+	else if (IS_ENABLED(CONFIG_DRM_I915_DEBUG) ||
+		 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
+		guc_log_level = GUC_LOG_LEVEL_MAX;
+	else
+		guc_log_level = GUC_LOG_LEVEL_NON_VERBOSE;
 
 	/* Any platform specific fine-tuning can be done here */
 
@@ -143,19 +144,17 @@ static void sanitize_options_early(struct drm_i915_private *dev_priv)
 		i915_modparams.guc_log_level = 0;
 	}
 
-	if (i915_modparams.guc_log_level >
-	    GUC_VERBOSITY_TO_LOG_LEVEL(GUC_LOG_VERBOSITY_MAX)) {
+	if (i915_modparams.guc_log_level > GUC_LOG_LEVEL_MAX) {
 		DRM_WARN("Incompatible option detected: %s=%d, %s!\n",
 			 "guc_log_level", i915_modparams.guc_log_level,
 			 "verbosity too high");
-		i915_modparams.guc_log_level =
-			GUC_VERBOSITY_TO_LOG_LEVEL(GUC_LOG_VERBOSITY_MAX);
+		i915_modparams.guc_log_level = GUC_LOG_LEVEL_MAX;
 	}
 
 	DRM_DEBUG_DRIVER("guc_log_level=%d (enabled:%s, verbose:%s, verbosity:%d)\n",
 			 i915_modparams.guc_log_level,
 			 yesno(i915_modparams.guc_log_level),
-			 yesno(GUC_LOG_LEVEL_TO_VERBOSE(i915_modparams.guc_log_level)),
+			 yesno(GUC_LOG_LEVEL_IS_VERBOSE(i915_modparams.guc_log_level)),
 			 GUC_LOG_LEVEL_TO_VERBOSITY(i915_modparams.guc_log_level));
 
 	/* Make sure that sanitization was done */