linux-kernel - Re: [PATCH v1] PM: runtime: add tracepoint for runtime

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Message-ID: <20240221121420.2e32fd00@gandalf.local.home>
Date: Wed, 21 Feb 2024 12:14:20 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Vilas Bhat <vilasbhat@...gle.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>,
 Len Brown <len.brown@...el.com>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Saravana Kannan
 <saravanak@...gle.com>, kernel-team@...roid.com, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v1] PM: runtime: add tracepoint for runtime_status
 changes

On Wed, 21 Feb 2024 16:41:10 +0000
Vilas Bhat <vilasbhat@...gle.com> wrote:


> diff --git a/include/trace/events/rpm.h b/include/trace/events/rpm.h
> index 3c716214dab1..f1dc4e95dbce 100644
> --- a/include/trace/events/rpm.h
> +++ b/include/trace/events/rpm.h
> @@ -101,6 +101,42 @@ TRACE_EVENT(rpm_return_int,
>  		__entry->ret)
>  );
>  
> +#define RPM_STATUS_STRINGS \
> +	{ RPM_INVALID, "RPM_INVALID" }, \
> +	{ RPM_ACTIVE, "RPM_ACTIVE" }, \
> +	{ RPM_RESUMING, "RPM_RESUMING" }, \
> +	{ RPM_SUSPENDED, "RPM_SUSPENDED" }, \
> +	{ RPM_SUSPENDING, "RPM_SUSPENDING" }
> +
> +/*
> + * ftrace's __print_symbolic requires that all enum values be wrapped in the
> + * TRACE_DEFINE_ENUM macro so that the enum value can be encoded in the ftrace
> + * ring buffer.
> + */
> +TRACE_DEFINE_ENUM(RPM_INVALID);
> +TRACE_DEFINE_ENUM(RPM_ACTIVE);
> +TRACE_DEFINE_ENUM(RPM_RESUMING);
> +TRACE_DEFINE_ENUM(RPM_SUSPENDED);
> +TRACE_DEFINE_ENUM(RPM_SUSPENDING);

You could do what everyone else does:

#define RPM_STATUS_STRINGS			\
	EM( RPM_INVALID, "RPM_INVALID" )	\
	EM( RPM_ACTIVE, "RPM_ACTIVE" )		\
	EM( RPM_RESUMING, "RPM_RESUMING" )	\
	EM( RPM_SUSPENDED, "RPM_SUSPENDED" )	\
	EMe( RPM_SUSPENDING, "RPM_SUSPENDING" )

#undef EM
#undef EMe
#define EM(a, b)	TRACE_DEFINE_ENUM(a);
#define EMe(a, b)	TRACE_DEFINE_ENUM(a);

RPM_STATUS_STRINGS

#undef EM
#undef EMe
#define EM(a, b)	{ a, b },
#define EMe(a, b)	{ a, b }

> +
> +TRACE_EVENT(rpm_status,
> +	TP_PROTO(struct device *dev, enum rpm_status status),
> +	TP_ARGS(dev, status),
> +
> +	TP_STRUCT__entry(
> +		__string(name,	dev_name(dev))
> +		__field(int,	status)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(name, dev_name(dev));
> +		__entry->status = status;
> +	),
> +
> +	TP_printk("%s status=%s", __get_str(name),
> +		__print_symbolic(__entry->status, RPM_STATUS_STRINGS))

This will be what you want with that last redefine of EM*()

-- Steve


> +);
> +
>  #endif /* _TRACE_RUNTIME_POWER_H */
>  
>  /* This part must be outside protection */