drm/i915/guc: Create common entry points for log register/unregister

We have many functions responsible for allocating different parts of
GuC log runtime called from multiple places. Let's stick with keeping
everything in guc_log_register instead.

v2: Use more generic intel_uc_register name, keep using "misc" suffix (Michał)
    s/dev_priv/i915 (Sagar)
    Make guc_log_relay_* static (sparse)
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180308154707.21716-2-michal.winiarski@intel.com

drivers/gpu/drm/i915/i915_drv.c

@@ -1238,9 +1238,11 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
 	/* Reveal our presence to userspace */
 	if (drm_dev_register(dev, 0) == 0) {
 		i915_debugfs_register(dev_priv);
-		i915_guc_log_register(dev_priv);
 		i915_setup_sysfs(dev_priv);
 
+		/* Depends on debugfs having been initialized */
+		intel_uc_register(dev_priv);
+
 		/* Depends on sysfs having been initialized */
 		i915_perf_register(dev_priv);
 	} else
@@ -1298,7 +1300,7 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv)
 	i915_pmu_unregister(dev_priv);
 
 	i915_teardown_sysfs(dev_priv);
-	i915_guc_log_unregister(dev_priv);
+	intel_uc_unregister(dev_priv);
 	drm_dev_unregister(&dev_priv->drm);
 
 	i915_gem_shrinker_unregister(dev_priv);

drivers/gpu/drm/i915/intel_guc_log.c

@@ -443,7 +443,7 @@ void intel_guc_log_init_early(struct intel_guc *guc)
 	INIT_WORK(&guc->log.runtime.flush_work, capture_logs_work);
 }
 
-int intel_guc_log_relay_create(struct intel_guc *guc)
+static int guc_log_relay_create(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 	struct rchan *guc_log_relay_chan;
@@ -496,7 +496,7 @@ int intel_guc_log_relay_create(struct intel_guc *guc)
 	return ret;
 }
 
-void intel_guc_log_relay_destroy(struct intel_guc *guc)
+static void guc_log_relay_destroy(struct intel_guc *guc)
 {
 	mutex_lock(&guc->log.runtime.relay_lock);
 
@@ -514,49 +514,6 @@ void intel_guc_log_relay_destroy(struct intel_guc *guc)
 	mutex_unlock(&guc->log.runtime.relay_lock);
 }
 
-static int guc_log_late_setup(struct intel_guc *guc)
-{
-	struct drm_i915_private *dev_priv = guc_to_i915(guc);
-	int ret;
-
-	if (!guc_log_has_runtime(guc)) {
-		/*
-		 * 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 = intel_guc_log_relay_create(guc);
-		if (ret)
-			goto err;
-
-		mutex_lock(&dev_priv->drm.struct_mutex);
-		intel_runtime_pm_get(dev_priv);
-		ret = guc_log_runtime_create(guc);
-		intel_runtime_pm_put(dev_priv);
-		mutex_unlock(&dev_priv->drm.struct_mutex);
-
-		if (ret)
-			goto err_relay;
-	}
-
-	ret = guc_log_relay_file_create(guc);
-	if (ret)
-		goto err_runtime;
-
-	return 0;
-
-err_runtime:
-	mutex_lock(&dev_priv->drm.struct_mutex);
-	guc_log_runtime_destroy(guc);
-	mutex_unlock(&dev_priv->drm.struct_mutex);
-err_relay:
-	intel_guc_log_relay_destroy(guc);
-err:
-	/* logging will remain off */
-	i915_modparams.guc_log_level = 0;
-	return ret;
-}
-
 static void guc_log_capture_logs(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
@@ -576,16 +533,6 @@ 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)
-		return;
-
-	/* First disable the interrupts, will be renabled afterwards */
-	mutex_lock(&dev_priv->drm.struct_mutex);
-	intel_runtime_pm_get(dev_priv);
-	gen9_disable_guc_interrupts(dev_priv);
-	intel_runtime_pm_put(dev_priv);
-	mutex_unlock(&dev_priv->drm.struct_mutex);
-
 	/*
 	 * Before initiating the forceful flush, wait for any pending/ongoing
 	 * flush to complete otherwise forceful flush may not actually happen.
@@ -628,12 +575,6 @@ int intel_guc_log_create(struct intel_guc *guc)
 
 	guc->log.vma = vma;
 
-	if (i915_modparams.guc_log_level) {
-		ret = guc_log_runtime_create(guc);
-		if (ret < 0)
-			goto err_vma;
-	}
-
 	/* each allocated unit is a page */
 	flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL |
 		(GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) |
@@ -645,8 +586,6 @@ int intel_guc_log_create(struct intel_guc *guc)
 
 	return 0;
 
-err_vma:
-	i915_vma_unpin_and_release(&guc->log.vma);
 err:
 	/* logging will be off */
 	i915_modparams.guc_log_level = 0;
@@ -712,26 +651,14 @@ int intel_guc_log_control_set(struct intel_guc *guc, u64 val)
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 
 	if (enabled && !guc_log_has_runtime(guc)) {
-		ret = guc_log_late_setup(guc);
+		ret = intel_guc_log_register(guc);
 		if (ret) {
-			DRM_DEBUG_DRIVER("GuC log late setup failed %d\n", ret);
+			/* logging will remain off */
+			i915_modparams.guc_log_level = 0;
 			goto out;
 		}
-
-		/* GuC logging is currently the only user of Guc2Host interrupts */
-		mutex_lock(&dev_priv->drm.struct_mutex);
-		intel_runtime_pm_get(dev_priv);
-		gen9_enable_guc_interrupts(dev_priv);
-		intel_runtime_pm_put(dev_priv);
-		mutex_unlock(&dev_priv->drm.struct_mutex);
 	} else if (!enabled && guc_log_has_runtime(guc)) {
-		/*
-		 * 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.
-		 */
-		guc_flush_logs(guc);
+		intel_guc_log_unregister(guc);
 	}
 
 	return 0;
@@ -742,29 +669,72 @@ int intel_guc_log_control_set(struct intel_guc *guc, u64 val)
 	return ret;
 }
 
-void i915_guc_log_register(struct drm_i915_private *dev_priv)
+int intel_guc_log_register(struct intel_guc *guc)
 {
-	if (!USES_GUC_SUBMISSION(dev_priv) || !i915_modparams.guc_log_level)
-		return;
+	struct drm_i915_private *i915 = guc_to_i915(guc);
+	int ret;
 
-	guc_log_late_setup(&dev_priv->guc);
+	GEM_BUG_ON(guc_log_has_runtime(guc));
+
+	/*
+	 * 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_relay_create(guc);
+	if (ret)
+		goto err;
+
+	mutex_lock(&i915->drm.struct_mutex);
+	ret = guc_log_runtime_create(guc);
+	mutex_unlock(&i915->drm.struct_mutex);
+
+	if (ret)
+		goto err_relay;
+
+	ret = guc_log_relay_file_create(guc);
+	if (ret)
+		goto err_runtime;
+
+	/* GuC logging is currently the only user of Guc2Host interrupts */
+	mutex_lock(&i915->drm.struct_mutex);
+	intel_runtime_pm_get(i915);
+	gen9_enable_guc_interrupts(i915);
+	intel_runtime_pm_put(i915);
+	mutex_unlock(&i915->drm.struct_mutex);
+
+	return 0;
+
+err_runtime:
+	mutex_lock(&i915->drm.struct_mutex);
+	guc_log_runtime_destroy(guc);
+	mutex_unlock(&i915->drm.struct_mutex);
+err_relay:
+	guc_log_relay_destroy(guc);
+err:
+	return ret;
 }
 
-void i915_guc_log_unregister(struct drm_i915_private *dev_priv)
+void intel_guc_log_unregister(struct intel_guc *guc)
 {
-	struct intel_guc *guc = &dev_priv->guc;
+	struct drm_i915_private *i915 = guc_to_i915(guc);
 
-	if (!USES_GUC_SUBMISSION(dev_priv))
-		return;
+	/*
+	 * 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.
+	 */
+	guc_flush_logs(guc);
 
-	mutex_lock(&dev_priv->drm.struct_mutex);
+	mutex_lock(&i915->drm.struct_mutex);
 	/* GuC logging is currently the only user of Guc2Host interrupts */
-	intel_runtime_pm_get(dev_priv);
-	gen9_disable_guc_interrupts(dev_priv);
-	intel_runtime_pm_put(dev_priv);
+	intel_runtime_pm_get(i915);
+	gen9_disable_guc_interrupts(i915);
+	intel_runtime_pm_put(i915);
 
 	guc_log_runtime_destroy(guc);
-	mutex_unlock(&dev_priv->drm.struct_mutex);
+	mutex_unlock(&i915->drm.struct_mutex);
 
-	intel_guc_log_relay_destroy(guc);
+	guc_log_relay_destroy(guc);
 }

drivers/gpu/drm/i915/intel_guc_log.h

@@ -62,11 +62,9 @@ struct intel_guc_log {
 int intel_guc_log_create(struct intel_guc *guc);
 void intel_guc_log_destroy(struct intel_guc *guc);
 void intel_guc_log_init_early(struct intel_guc *guc);
-int intel_guc_log_relay_create(struct intel_guc *guc);
-void intel_guc_log_relay_destroy(struct intel_guc *guc);
 int intel_guc_log_control_get(struct intel_guc *guc);
 int intel_guc_log_control_set(struct intel_guc *guc, u64 control_val);
-void i915_guc_log_register(struct drm_i915_private *dev_priv);
-void i915_guc_log_unregister(struct drm_i915_private *dev_priv);
+int intel_guc_log_register(struct intel_guc *guc);
+void intel_guc_log_unregister(struct intel_guc *guc);
 
 #endif

drivers/gpu/drm/i915/intel_uc.c

@@ -219,6 +219,28 @@ static void guc_free_load_err_log(struct intel_guc *guc)
 		i915_gem_object_put(guc->load_err_log);
 }
 
+int intel_uc_register(struct drm_i915_private *i915)
+{
+	int ret = 0;
+
+	if (!USES_GUC(i915))
+		return 0;
+
+	if (i915_modparams.guc_log_level)
+		ret = intel_guc_log_register(&i915->guc);
+
+	return ret;
+}
+
+void intel_uc_unregister(struct drm_i915_private *i915)
+{
+	if (!USES_GUC(i915))
+		return;
+
+	if (i915_modparams.guc_log_level)
+		intel_guc_log_unregister(&i915->guc);
+}
+
 static int guc_enable_communication(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
@@ -249,23 +271,10 @@ int intel_uc_init_misc(struct drm_i915_private *dev_priv)
 		return 0;
 
 	ret = intel_guc_init_wq(guc);
-	if (ret) {
-		DRM_ERROR("Couldn't allocate workqueues for GuC\n");
-		goto err;
-	}
-
-	ret = intel_guc_log_relay_create(guc);
-	if (ret) {
-		DRM_ERROR("Couldn't allocate relay for GuC log\n");
-		goto err_relay;
-	}
+	if (ret)
+		return ret;
 
 	return 0;
-
-err_relay:
-	intel_guc_fini_wq(guc);
-err:
-	return ret;
 }
 
 void intel_uc_fini_misc(struct drm_i915_private *dev_priv)
@@ -276,8 +285,6 @@ void intel_uc_fini_misc(struct drm_i915_private *dev_priv)
 		return;
 
 	intel_guc_fini_wq(guc);
-
-	intel_guc_log_relay_destroy(guc);
 }
 
 int intel_uc_init(struct drm_i915_private *dev_priv)

drivers/gpu/drm/i915/intel_uc.h

@@ -31,6 +31,8 @@
 void intel_uc_sanitize_options(struct drm_i915_private *dev_priv);
 void intel_uc_init_early(struct drm_i915_private *dev_priv);
 void intel_uc_init_mmio(struct drm_i915_private *dev_priv);
+int intel_uc_register(struct drm_i915_private *dev_priv);
+void intel_uc_unregister(struct drm_i915_private *dev_priv);
 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);