drm/i915/guc: Redefine guc_log_level modparam values

We used value -1 to indicate "disabled" and values 0..3 to
indicate "enabled", but most of our other modparams are using
-1 for "auto" mode and 0 for "disable". For consistency let's
change our log level values to:

-1: auto (depends on platform and Kconfig.debug settings)
 0: disabled
 1: enabled (severity level 0 = min)
 2: enabled (severity level 1)
 3: enabled (severity level 2)
 4: enabled (severity level 3 = max)

v2: fix commit message (Sagar)
    display sanitized modparam value (Sagar)
    unify sanitize messages (Sagar/Michal)

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180111152441.21676-1-michal.wajdeczko@intel.com
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 22 insertions, 25 deletions

diff --git a/drivers/gpu/drm/i915/intel_guc_log.c b/drivers/gpu/drm/i915/intel_guc_log.c
index eaedd63e3819..e6d59bf9dae1 100644
--- a/drivers/gpu/drm/i915/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/intel_guc_log.c
@@ -33,11 +33,10 @@ static void guc_log_capture_logs(struct intel_guc *guc);
 /**
  * DOC: GuC firmware log
  *
- * Firmware log is enabled by setting i915.guc_log_level to non-negative level.
+ * Firmware log is enabled by setting i915.guc_log_level to the positive level.
  * Log data is printed out via reading debugfs i915_guc_log_dump. Reading from
  * i915_guc_load_status will print out firmware loading status and scratch
  * registers value.
- *
  */
 
 static int guc_log_flush_complete(struct intel_guc *guc)
@@ -147,7 +146,7 @@ static int guc_log_relay_file_create(struct intel_guc *guc)
 	struct dentry *log_dir;
 	int ret;
 
-	if (i915_modparams.guc_log_level < 0)
+	if (!i915_modparams.guc_log_level)
 		return 0;
 
 	/* For now create the log file in /sys/kernel/debug/dri/0 dir */
@@ -423,8 +422,8 @@ static void guc_log_runtime_destroy(struct intel_guc *guc)
 {
 	/*
 	 * It's possible that the runtime stuff was never allocated because
-	 * guc_log_level was < 0 at the time
-	 **/
+	 * GuC log was disabled at the boot time.
+	 */
 	if (!guc_log_has_runtime(guc))
 		return;
 
@@ -441,9 +440,10 @@ static int guc_log_late_setup(struct intel_guc *guc)
 	lockdep_assert_held(&dev_priv->drm.struct_mutex);
 
 	if (!guc_log_has_runtime(guc)) {
-		/* If log_level was set as -1 at boot time, then setup needed to
-		 * handle log buffer flush interrupts would not have been done yet,
-		 * so do that now.
+		/*
+		 * If log was disabled at boot time, then setup needed to handle
+		 * log buffer flush interrupts would not have been done yet, so
+		 * do that now.
 		 */
 		ret = guc_log_runtime_create(guc);
 		if (ret)
@@ -460,7 +460,7 @@ err_runtime:
 	guc_log_runtime_destroy(guc);
 err:
 	/* logging will remain off */
-	i915_modparams.guc_log_level = -1;
+	i915_modparams.guc_log_level = 0;
 	return ret;
 }
 
@@ -482,8 +482,7 @@ static void guc_flush_logs(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 
-	if (!USES_GUC_SUBMISSION(dev_priv) ||
-	    (i915_modparams.guc_log_level < 0))
+	if (!USES_GUC_SUBMISSION(dev_priv) || !i915_modparams.guc_log_level)
 		return;
 
 	/* First disable the interrupts, will be renabled afterwards */
@@ -511,9 +510,6 @@ int intel_guc_log_create(struct intel_guc *guc)
 
 	GEM_BUG_ON(guc->log.vma);
 
-	if (i915_modparams.guc_log_level > GUC_LOG_VERBOSITY_MAX)
-		i915_modparams.guc_log_level = GUC_LOG_VERBOSITY_MAX;
-
 	/* The first page is to save log buffer state. Allocate one
 	 * extra page for others in case for overlap */
 	size = (1 + GUC_LOG_DPC_PAGES + 1 +
@@ -537,7 +533,7 @@ int intel_guc_log_create(struct intel_guc *guc)
 
 	guc->log.vma = vma;
 
-	if (i915_modparams.guc_log_level >= 0) {
+	if (i915_modparams.guc_log_level) {
 		ret = guc_log_runtime_create(guc);
 		if (ret < 0)
 			goto err_vma;
@@ -558,7 +554,7 @@ err_vma:
 	i915_vma_unpin_and_release(&guc->log.vma);
 err:
 	/* logging will be off */
-	i915_modparams.guc_log_level = -1;
+	i915_modparams.guc_log_level = 0;
 	return ret;
 }
 
@@ -582,7 +578,7 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 		return -EINVAL;
 
 	/* This combination doesn't make sense & won't have any effect */
-	if (!log_param.logging_enabled && (i915_modparams.guc_log_level < 0))
+	if (!log_param.logging_enabled && !i915_modparams.guc_log_level)
 		return 0;
 
 	ret = guc_log_control(guc, log_param.value);
@@ -592,11 +588,12 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 	}
 
 	if (log_param.logging_enabled) {
-		i915_modparams.guc_log_level = log_param.verbosity;
+		i915_modparams.guc_log_level = 1 + log_param.verbosity;
 
-		/* If log_level was set as -1 at boot time, then the relay channel file
-		 * wouldn't have been created by now and interrupts also would not have
-		 * been enabled. Try again now, just in case.
+		/*
+		 * If log was disabled at boot time, then the relay channel file
+		 * wouldn't have been created by now and interrupts also would
+		 * not have been enabled. Try again now, just in case.
 		 */
 		ret = guc_log_late_setup(guc);
 		if (ret < 0) {
@@ -607,7 +604,8 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 		/* GuC logging is currently the only user of Guc2Host interrupts */
 		gen9_enable_guc_interrupts(dev_priv);
 	} else {
-		/* Once logging is disabled, GuC won't generate logs & send an
+		/*
+		 * Once logging is disabled, GuC won't generate logs & send an
 		 * interrupt. But there could be some data in the log buffer
 		 * which is yet to be captured. So request GuC to update the log
 		 * buffer state and then collect the left over logs.
@@ -615,7 +613,7 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 		guc_flush_logs(guc);
 
 		/* As logging is disabled, update log level to reflect that */
-		i915_modparams.guc_log_level = -1;
+		i915_modparams.guc_log_level = 0;
 	}
 
 	return ret;
@@ -623,8 +621,7 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 
 void i915_guc_log_register(struct drm_i915_private *dev_priv)
 {
-	if (!USES_GUC_SUBMISSION(dev_priv) ||
-	    (i915_modparams.guc_log_level < 0))
+	if (!USES_GUC_SUBMISSION(dev_priv) || !i915_modparams.guc_log_level)
 		return;
 
 	mutex_lock(&dev_priv->drm.struct_mutex);