coresight: config: Add preloaded configurations

Preload set of configurations.

This patch creates a small set of preloaded configurations and features
that are available immediately after coresight has been initialised.

The current set provides a strobing feature for ETMv4, that creates a
periodic sampling of trace by switching trace generation on and off
using counters in the ETM.

A configuration called "autofdo" is also provided that uses the 'strobing'
feature and provides a couple of preset values, selectable on the perf
command line.

Link: https://lore.kernel.org/r/20210723165444.1048-9-mike.leach@linaro.org
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210818194022.379573-9-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/hwtracing/coresight/coresight-cfg-preload.c b/drivers/hwtracing/coresight/coresight-cfg-preload.c
new file mode 100644
index 000000000000..751af3710d56
--- /dev/null
+++ b/drivers/hwtracing/coresight/coresight-cfg-preload.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(C) 2020 Linaro Limited. All rights reserved.
+ * Author: Mike Leach <mike.leach@linaro.org>
+ */
+
+#include "coresight-cfg-preload.h"
+#include "coresight-config.h"
+#include "coresight-syscfg.h"
+
+/* Basic features and configurations pre-loaded on initialisation */
+
+static struct cscfg_feature_desc *preload_feats[] = {
+#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
+	&strobe_etm4x,
+#endif
+	NULL
+};
+
+static struct cscfg_config_desc *preload_cfgs[] = {
+#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM4X)
+	&afdo_etm4x,
+#endif
+	NULL
+};
+
+/* preload called on initialisation */
+int cscfg_preload(void)
+{
+	return cscfg_load_config_sets(preload_cfgs, preload_feats);
+}