drm/i915/guc: Don't store runtime GuC log level in modparam

Currently we are using modparam as placeholder for GuC log level.
Stop doing this and keep runtime GuC level in intel_guc_log struct.

v2:
- rename functions intel_guc_log_level_[get|set] to
intel_guc_log_[get|set]_level (Michał Wajdeczko)
- remove GEM_BUG_ON from intel_guc_log_get_level() (Michał Wajdeczko)

Signed-off-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180604141947.8299-1-piotr.piorkowski@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2536,7 +2536,7 @@ static int i915_guc_log_level_get(void *data, u64 *val)
 	if (!USES_GUC(dev_priv))
 		return -ENODEV;
 
-	*val = intel_guc_log_level_get(&dev_priv->guc.log);
+	*val = intel_guc_log_get_level(&dev_priv->guc.log);
 
 	return 0;
 }
@@ -2548,7 +2548,7 @@ static int i915_guc_log_level_set(void *data, u64 val)
 	if (!USES_GUC(dev_priv))
 		return -ENODEV;
 
-	return intel_guc_log_level_set(&dev_priv->guc.log, val);
+	return intel_guc_log_set_level(&dev_priv->guc.log, val);
 }
 
 DEFINE_SIMPLE_ATTRIBUTE(i915_guc_log_level_fops,

drivers/gpu/drm/i915/intel_guc.c

@@ -203,13 +203,11 @@ void intel_guc_fini(struct intel_guc *guc)
 	guc_shared_data_destroy(guc);
 }
 
-static u32 get_log_control_flags(void)
+static u32 guc_ctl_debug_flags(struct intel_guc *guc)
 {
-	u32 level = i915_modparams.guc_log_level;
+	u32 level = intel_guc_log_get_level(&guc->log);
 	u32 flags = 0;
 
-	GEM_BUG_ON(level < 0);
-
 	if (!GUC_LOG_LEVEL_IS_ENABLED(level))
 		flags |= GUC_LOG_DEFAULT_DISABLED;
 
@@ -250,7 +248,7 @@ void intel_guc_init_params(struct intel_guc *guc)
 
 	params[GUC_CTL_LOG_PARAMS] = guc->log.flags;
 
-	params[GUC_CTL_DEBUG] = get_log_control_flags();
+	params[GUC_CTL_DEBUG] = guc_ctl_debug_flags(guc);
 
 	/* If GuC submission is enabled, set up additional parameters here */
 	if (USES_GUC_SUBMISSION(dev_priv)) {

drivers/gpu/drm/i915/intel_guc_log.c

@@ -475,11 +475,12 @@ int intel_guc_log_create(struct intel_guc_log *log)
 	offset = intel_guc_ggtt_offset(guc, vma) >> PAGE_SHIFT;
 	log->flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags;
 
+	log->level = i915_modparams.guc_log_level;
+
 	return 0;
 
 err:
-	/* logging will be off */
-	i915_modparams.guc_log_level = 0;
+	DRM_ERROR("Failed to allocate GuC log buffer. %d\n", ret);
 	return ret;
 }
 
@@ -488,15 +489,7 @@ void intel_guc_log_destroy(struct intel_guc_log *log)
 	i915_vma_unpin_and_release(&log->vma);
 }
 
-int intel_guc_log_level_get(struct intel_guc_log *log)
-{
-	GEM_BUG_ON(!log->vma);
-	GEM_BUG_ON(i915_modparams.guc_log_level < 0);
-
-	return i915_modparams.guc_log_level;
-}
-
-int intel_guc_log_level_set(struct intel_guc_log *log, u64 val)
+int intel_guc_log_set_level(struct intel_guc_log *log, u32 level)
 {
 	struct intel_guc *guc = log_to_guc(log);
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
@@ -504,33 +497,32 @@ int intel_guc_log_level_set(struct intel_guc_log *log, u64 val)
 
 	BUILD_BUG_ON(GUC_LOG_VERBOSITY_MIN != 0);
 	GEM_BUG_ON(!log->vma);
-	GEM_BUG_ON(i915_modparams.guc_log_level < 0);
 
 	/*
 	 * 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_LOG_LEVEL_MAX)
+	if (level < GUC_LOG_LEVEL_DISABLED || level > GUC_LOG_LEVEL_MAX)
 		return -EINVAL;
 
 	mutex_lock(&dev_priv->drm.struct_mutex);
 
-	if (i915_modparams.guc_log_level == val) {
+	if (log->level == level) {
 		ret = 0;
 		goto out_unlock;
 	}
 
 	intel_runtime_pm_get(dev_priv);
-	ret = guc_action_control_log(guc, GUC_LOG_LEVEL_IS_VERBOSE(val),
-				     GUC_LOG_LEVEL_IS_ENABLED(val),
-				     GUC_LOG_LEVEL_TO_VERBOSITY(val));
+	ret = guc_action_control_log(guc, GUC_LOG_LEVEL_IS_VERBOSE(level),
+				     GUC_LOG_LEVEL_IS_ENABLED(level),
+				     GUC_LOG_LEVEL_TO_VERBOSITY(level));
 	intel_runtime_pm_put(dev_priv);
 	if (ret) {
 		DRM_DEBUG_DRIVER("guc_log_control action failed %d\n", ret);
 		goto out_unlock;
 	}
 
-	i915_modparams.guc_log_level = val;
+	log->level = level;
 
 out_unlock:
 	mutex_unlock(&dev_priv->drm.struct_mutex);

drivers/gpu/drm/i915/intel_guc_log.h

@@ -30,6 +30,7 @@
 #include <linux/workqueue.h>
 
 #include "intel_guc_fwif.h"
+#include "i915_gem.h"
 
 struct intel_guc;
 
@@ -58,6 +59,7 @@ struct intel_guc;
 #define GUC_LOG_LEVEL_MAX GUC_VERBOSITY_TO_LOG_LEVEL(GUC_LOG_VERBOSITY_MAX)
 
 struct intel_guc_log {
+	u32 level;
 	u32 flags;
 	struct i915_vma *vma;
 	struct {
@@ -80,8 +82,7 @@ void intel_guc_log_init_early(struct intel_guc_log *log);
 int intel_guc_log_create(struct intel_guc_log *log);
 void intel_guc_log_destroy(struct intel_guc_log *log);
 
-int intel_guc_log_level_get(struct intel_guc_log *log);
-int intel_guc_log_level_set(struct intel_guc_log *log, u64 control_val);
+int intel_guc_log_set_level(struct intel_guc_log *log, u32 level);
 bool intel_guc_log_relay_enabled(const struct intel_guc_log *log);
 int intel_guc_log_relay_open(struct intel_guc_log *log);
 void intel_guc_log_relay_flush(struct intel_guc_log *log);
@@ -89,4 +90,9 @@ void intel_guc_log_relay_close(struct intel_guc_log *log);
 
 void intel_guc_log_handle_flush_event(struct intel_guc_log *log);
 
+static inline u32 intel_guc_log_get_level(struct intel_guc_log *log)
+{
+	return log->level;
+}
+
 #endif

drivers/gpu/drm/i915/intel_uc.c

@@ -207,7 +207,7 @@ void intel_uc_init_mmio(struct drm_i915_private *i915)
 
 static void guc_capture_load_err_log(struct intel_guc *guc)
 {
-	if (!guc->log.vma || !i915_modparams.guc_log_level)
+	if (!guc->log.vma || !intel_guc_log_get_level(&guc->log))
 		return;
 
 	if (!guc->load_err_log)