linux-kernel - [PATCH] pwm: Make info in traces about affected pwm more useful

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Message-ID: <20240705211452.1157967-2-u.kleine-koenig@baylibre.com>
Date: Fri,  5 Jul 2024 23:14:51 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH] pwm: Make info in traces about affected pwm more useful

The hashed pointer isn't useful to identify the pwm device. Instead
store and emit chipid and hwpwm.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...libre.com>
---
 include/trace/events/pwm.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/pwm.h b/include/trace/events/pwm.h
index 12b35e4ff917..8022701c446d 100644
--- a/include/trace/events/pwm.h
+++ b/include/trace/events/pwm.h
@@ -15,7 +15,8 @@ DECLARE_EVENT_CLASS(pwm,
 	TP_ARGS(pwm, state, err),
 
 	TP_STRUCT__entry(
-		__field(struct pwm_device *, pwm)
+		__field(unsigned int, chipid)
+		__field(unsigned int, hwpwm)
 		__field(u64, period)
 		__field(u64, duty_cycle)
 		__field(enum pwm_polarity, polarity)
@@ -24,7 +25,8 @@ DECLARE_EVENT_CLASS(pwm,
 	),
 
 	TP_fast_assign(
-		__entry->pwm = pwm;
+		__entry->chipid = pwm->chip->id;
+		__entry->hwpwm = pwm->hwpwm;
 		__entry->period = state->period;
 		__entry->duty_cycle = state->duty_cycle;
 		__entry->polarity = state->polarity;
@@ -32,8 +34,8 @@ DECLARE_EVENT_CLASS(pwm,
 		__entry->err = err;
 	),
 
-	TP_printk("%p: period=%llu duty_cycle=%llu polarity=%d enabled=%d err=%d",
-		  __entry->pwm, __entry->period, __entry->duty_cycle,
+	TP_printk("pwmchip%u.%u: period=%llu duty_cycle=%llu polarity=%d enabled=%d err=%d",
+		  __entry->chipid, __entry->hwpwm, __entry->period, __entry->duty_cycle,
 		  __entry->polarity, __entry->enabled, __entry->err)
 
 );

base-commit: 6ba37c70795abf1d59976b3a49acafac14b72a4f
-- 
2.43.0