PM / Runtime: Introduce trace points for tracing rpm_* functions

This patch introduces 3 trace points to prepare for tracing
rpm_idle/rpm_suspend/rpm_resume functions, so we can use these
trace points to replace the current dev_dbg().

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

3 files changed, 120 insertions, 0 deletions

diff --git a/include/trace/events/rpm.h b/include/trace/events/rpm.h
new file mode 100644
index 000000000000..d62c558bf64b
--- /dev/null
+++ b/include/trace/events/rpm.h
@@ -0,0 +1,99 @@
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM rpm
+
+#if !defined(_TRACE_RUNTIME_POWER_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_RUNTIME_POWER_H
+
+#include <linux/ktime.h>
+#include <linux/tracepoint.h>
+#include <linux/device.h>
+
+/*
+ * The rpm_internal events are used for tracing some important
+ * runtime pm internal functions.
+ */
+DECLARE_EVENT_CLASS(rpm_internal,
+
+        TP_PROTO(struct device *dev, int flags),
+
+        TP_ARGS(dev, flags),
+
+        TP_STRUCT__entry(
+                __string(       name,           dev_name(dev)   )
+                __field(        int,            flags           )
+                __field(        int ,           usage_count     )
+                __field(        int ,           disable_depth   )
+                __field(        int ,           runtime_auto    )
+                __field(        int ,           request_pending )
+                __field(        int ,           irq_safe        )
+                __field(        int ,           child_count     )
+        ),
+
+        TP_fast_assign(
+                __assign_str(name, dev_name(dev));
+                __entry->flags = flags;
+                __entry->usage_count = atomic_read(
+                        &dev->power.usage_count);
+                __entry->disable_depth = dev->power.disable_depth;
+                __entry->runtime_auto = dev->power.runtime_auto;
+                __entry->request_pending = dev->power.request_pending;
+                __entry->irq_safe = dev->power.irq_safe;
+                __entry->child_count = atomic_read(
+                        &dev->power.child_count);
+        ),
+
+        TP_printk("%s flags-%x cnt-%-2d dep-%-2d auto-%-1d p-%-1d"
+                        " irq-%-1d child-%d",
+                        __get_str(name), __entry->flags,
+                        __entry->usage_count,
+                        __entry->disable_depth,
+                        __entry->runtime_auto,
+                        __entry->request_pending,
+                        __entry->irq_safe,
+                        __entry->child_count
+                 )
+);
+DEFINE_EVENT(rpm_internal, rpm_suspend,
+
+        TP_PROTO(struct device *dev, int flags),
+
+        TP_ARGS(dev, flags)
+);
+DEFINE_EVENT(rpm_internal, rpm_resume,
+
+        TP_PROTO(struct device *dev, int flags),
+
+        TP_ARGS(dev, flags)
+);
+DEFINE_EVENT(rpm_internal, rpm_idle,
+
+        TP_PROTO(struct device *dev, int flags),
+
+        TP_ARGS(dev, flags)
+);
+
+TRACE_EVENT(rpm_return_int,
+        TP_PROTO(struct device *dev, unsigned long ip, int ret),
+        TP_ARGS(dev, ip, ret),
+
+        TP_STRUCT__entry(
+                __string(       name,           dev_name(dev))
+                __field(        unsigned long,          ip      )
+                __field(        int,                    ret     )
+        ),
+
+        TP_fast_assign(
+                __assign_str(name, dev_name(dev));
+                __entry->ip = ip;
+                __entry->ret = ret;
+        ),
+
+        TP_printk("%pS:%s ret=%d", (void *)__entry->ip, __get_str(name),
+                __entry->ret)
+);
+
+#endif /* _TRACE_RUNTIME_POWER_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 761c510a06c5..56bdab5b3793 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -53,6 +53,7 @@ endif
 obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
 obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
 obj-$(CONFIG_TRACEPOINTS) += power-traces.o
+obj-$(CONFIG_TRACEPOINTS) += rpm-traces.o
 ifeq ($(CONFIG_TRACING),y)
 obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
 endif
diff --git a/kernel/trace/rpm-traces.c b/kernel/trace/rpm-traces.c
new file mode 100644
index 000000000000..4b3b5eaf94d1
--- /dev/null
+++ b/kernel/trace/rpm-traces.c
@@ -0,0 +1,20 @@
+/*
+ * Power trace points
+ *
+ * Copyright (C) 2009 Ming Lei <ming.lei@canonical.com>
+ */
+
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/rpm.h>
+
+EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_return_int);
+EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_idle);
+EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_suspend);
+EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_resume);