linux-kernel - [PATCH v2 3/3] interconnect: Add basic tracepoints

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Date:   Fri,  1 Nov 2019 15:00:31 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     linux-pm@...r.kernel.org, rostedt@...dmis.org, mingo@...hat.com
Cc:     bjorn.andersson@...aro.org, vincent.guittot@...aro.org,
        daidavid1@...eaurora.org, okukatla@...eaurora.org,
        evgreen@...omium.org, mka@...omium.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Georgi Djakov <georgi.djakov@...aro.org>
Subject: [PATCH v2 3/3] interconnect: Add basic tracepoints

The tracepoints can help with understanding the system behavior of a
given interconnect path when the consumer drivers change their bandwidth
demands. This might be interesting when we want to monitor the requested
interconnect bandwidth for each client driver. The paths may share the
same nodes and this will help to understand "who and when is requesting
what". All this is useful for subsystem drivers developers and may also
provide hints when optimizing the power and performance profile of the
system.

Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
---
 MAINTAINERS                         |  1 +
 drivers/interconnect/core.c         |  7 +++
 include/trace/events/interconnect.h | 81 +++++++++++++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 include/trace/events/interconnect.h

diff --git a/MAINTAINERS b/MAINTAINERS
index a69e6db80c79..16f28fa515f2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8522,6 +8522,7 @@ F:	drivers/interconnect/
 F:	include/dt-bindings/interconnect/
 F:	include/linux/interconnect-provider.h
 F:	include/linux/interconnect.h
+F:	include/trace/events/interconnect.h
 
 INVENSENSE MPU-3050 GYROSCOPE DRIVER
 M:	Linus Walleij <linus.walleij@...aro.org>
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index df44ef713db5..15e11e22ddf7 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -26,6 +26,9 @@ static LIST_HEAD(icc_providers);
 static DEFINE_MUTEX(icc_lock);
 static struct dentry *icc_debugfs_dir;
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/interconnect.h>
+
 static void icc_summary_show_one(struct seq_file *s, struct icc_node *n)
 {
 	if (!n)
@@ -435,6 +438,8 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
 
 		/* aggregate requests for this node */
 		aggregate_requests(node);
+
+		trace_icc_set_bw(path, node, i, avg_bw, peak_bw);
 	}
 
 	ret = apply_constraints(path);
@@ -453,6 +458,8 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
 
 	mutex_unlock(&icc_lock);
 
+	trace_icc_set_bw_end(path, ret);
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(icc_set_bw);
diff --git a/include/trace/events/interconnect.h b/include/trace/events/interconnect.h
new file mode 100644
index 000000000000..64b646aa7bd3
--- /dev/null
+++ b/include/trace/events/interconnect.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019, Linaro Ltd.
+ * Author: Georgi Djakov <georgi.djakov@...aro.org>
+ */
+
+#if !defined(_TRACE_INTERCONNECT_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_INTERCONNECT_H
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM interconnect
+
+#include "../../../drivers/interconnect/internal.h"
+
+TRACE_EVENT(icc_set_bw,
+
+	TP_PROTO(struct icc_path *p, struct icc_node *n, int i,
+		 u32 avg_bw, u32 peak_bw),
+
+	TP_ARGS(p, n, i, avg_bw, peak_bw),
+
+	TP_STRUCT__entry(
+		__string(path_name, p->name)
+		__string(dev, dev_name(p->reqs[i].dev))
+		__string(node_name, n->name)
+		__field(u32, avg_bw)
+		__field(u32, peak_bw)
+		__field(u32, node_avg_bw)
+		__field(u32, node_peak_bw)
+	),
+
+	TP_fast_assign(
+		__assign_str(path_name, p->name);
+		__assign_str(dev, dev_name(p->reqs[i].dev));
+		__assign_str(node_name, n->name);
+		__entry->avg_bw = avg_bw;
+		__entry->peak_bw = peak_bw;
+		__entry->node_avg_bw = n->avg_bw;
+		__entry->node_peak_bw = n->peak_bw;
+	),
+
+	TP_printk("path=%s dev=%s node=%s avg_bw=%u peak_bw=%u agg_avg=%u agg_peak=%u",
+		  __get_str(path_name),
+		  __get_str(dev),
+		  __get_str(node_name),
+		  __entry->avg_bw,
+		  __entry->peak_bw,
+		  __entry->node_avg_bw,
+		  __entry->node_peak_bw)
+);
+
+TRACE_EVENT(icc_set_bw_end,
+
+	TP_PROTO(struct icc_path *p, int ret),
+
+	TP_ARGS(p, ret),
+
+	TP_STRUCT__entry(
+		__string(path_name, p->name)
+		__string(dev, dev_name(p->reqs[0].dev))
+		__field(int, ret)
+	),
+
+	TP_fast_assign(
+		__assign_str(path_name, p->name);
+		__assign_str(dev, dev_name(p->reqs[0].dev));
+		__entry->ret = ret;
+	),
+
+	TP_printk("path=%s dev=%s ret=%d",
+		  __get_str(path_name),
+		  __get_str(dev),
+		  __entry->ret)
+);
+
+#endif /* _TRACE_INTERCONNECT_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>