From: Georgi Djakov <georgi.djakov@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
Georgi Djakov <georgi.djakov@linaro.org>,
Steven Rostedt <rostedt@goodmis.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>
Subject: [PATCH 05/12] interconnect: Add basic tracepoints
Date: Fri, 17 Jan 2020 11:58:09 +0200 [thread overview]
Message-ID: <20200117095816.23575-6-georgi.djakov@linaro.org> (raw)
In-Reply-To: <20200117095816.23575-1-georgi.djakov@linaro.org>
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.
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
---
drivers/interconnect/Makefile | 1 +
drivers/interconnect/core.c | 7 +++
drivers/interconnect/trace.h | 88 +++++++++++++++++++++++++++++++++++
3 files changed, 96 insertions(+)
create mode 100644 drivers/interconnect/trace.h
diff --git a/drivers/interconnect/Makefile b/drivers/interconnect/Makefile
index 28f2ab0824d5..725029ae7a2c 100644
--- a/drivers/interconnect/Makefile
+++ b/drivers/interconnect/Makefile
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
+CFLAGS_core.o := -I$(src)
icc-core-objs := core.o
obj-$(CONFIG_INTERCONNECT) += icc-core.o
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 4f9bdb7f9165..fbec2e4fdfeb 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -21,6 +21,9 @@
#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
static DEFINE_IDR(icc_idr);
static LIST_HEAD(icc_providers);
static DEFINE_MUTEX(icc_lock);
@@ -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/drivers/interconnect/trace.h b/drivers/interconnect/trace.h
new file mode 100644
index 000000000000..3d668ff566bf
--- /dev/null
+++ b/drivers/interconnect/trace.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Interconnect framework tracepoints
+ * Copyright (c) 2019, Linaro Ltd.
+ * Author: Georgi Djakov <georgi.djakov@linaro.org>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM interconnect
+
+#if !defined(_TRACE_INTERCONNECT_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_INTERCONNECT_H
+
+#include <linux/interconnect.h>
+#include <linux/tracepoint.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 */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+#include <trace/define_trace.h>
next prev parent reply other threads:[~2020-01-17 9:58 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 9:58 [GIT PULL 00/12] interconnect changes for 5.6 Georgi Djakov
2020-01-17 9:58 ` [PATCH 01/12] interconnect: Add a common helper for removing all nodes Georgi Djakov
2020-01-17 9:58 ` [PATCH 02/12] interconnect: qcom: Use the new common helper for node removal Georgi Djakov
2020-01-17 9:58 ` [PATCH 03/12] interconnect: Move internal structs into a separate file Georgi Djakov
2020-01-17 9:58 ` [PATCH 04/12] interconnect: Add a name to struct icc_path Georgi Djakov
2020-01-17 9:58 ` Georgi Djakov [this message]
2020-01-17 9:58 ` [PATCH 06/12] interconnect: Add a common standard aggregate function Georgi Djakov
2020-01-17 9:58 ` [PATCH 07/12] interconnect: qcom: Use the " Georgi Djakov
2020-01-17 9:58 ` [PATCH 08/12] interconnect: Add interconnect_graph file to debugfs Georgi Djakov
2020-01-17 9:58 ` [PATCH 09/12] interconnect: Print the tag in the debugfs summary Georgi Djakov
2020-01-17 9:58 ` [PATCH 10/12] interconnect: Check for valid path in icc_set_bw() Georgi Djakov
2020-01-17 9:58 ` [PATCH 11/12] dt-bindings: interconnect: Add Qualcomm MSM8916 DT bindings Georgi Djakov
2020-01-17 9:58 ` [PATCH 12/12] interconnect: qcom: Add MSM8916 interconnect provider driver Georgi Djakov
2020-01-22 9:05 ` [GIT PULL 00/12] interconnect changes for 5.6 Greg KH
2020-01-22 9:15 ` Georgi Djakov
2020-01-22 9:07 ` Georgi Djakov
2020-01-22 9:15 ` Greg KH
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