linux-kernel - [PATCH v1 5/7] thermal/debugfs: Compute maximum temperature for mitigation episode as a whole

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Message-ID: <3295271.aeNJFYEL58@kreacher>
Date: Thu, 09 May 2024 21:15:19 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Lukasz Luba <lukasz.luba@....com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>
Subject:
 [PATCH v1 5/7] thermal/debugfs: Compute maximum temperature for mitigation
 episode as a whole

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Notice that the maximum temperature above the trip point must be the
same for all of the trip points involved in a given mitigation episode,
so it need not be computerd for each of them separately.

It is sufficient to compute the maximum temperature for the mitigation
episode as a whole and print it accordingly, so do that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_debugfs.c |   30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

Index: linux-pm/drivers/thermal/thermal_debugfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_debugfs.c
+++ linux-pm/drivers/thermal/thermal_debugfs.c
@@ -92,7 +92,6 @@ struct cdev_record {
  * @timestamp: the trip crossing timestamp
  * @duration: total time when the zone temperature was above the trip point
  * @count: the number of times the zone temperature was above the trip point
- * @max: maximum recorded temperature above the trip point
  * @min: minimum recorded temperature above the trip point
  * @avg: average temperature above the trip point
  */
@@ -100,7 +99,6 @@ struct trip_stats {
 	ktime_t timestamp;
 	ktime_t duration;
 	int count;
-	int max;
 	int min;
 	int avg;
 };
@@ -115,15 +113,17 @@ struct trip_stats {
  * the way up and down if there are multiple trip described in the
  * firmware after the lowest temperature trip point.
  *
+ * @node: a list element to be added to the list of tz events
  * @timestamp: first trip point crossed the way up
  * @duration: total duration of the mitigation episode
- * @node: a list element to be added to the list of tz events
+ * @max_temp: maximum zone temperature during this episode
  * @trip_stats: per trip point statistics, flexible array
  */
 struct tz_episode {
+	struct list_head node;
 	ktime_t timestamp;
 	ktime_t duration;
-	struct list_head node;
+	int max_temp;
 	struct trip_stats trip_stats[];
 };
 
@@ -557,11 +557,10 @@ static struct tz_episode *thermal_debugf
 	INIT_LIST_HEAD(&tze->node);
 	tze->timestamp = now;
 	tze->duration = KTIME_MIN;
+	tze->max_temp = THERMAL_TEMP_INVALID;
 
-	for (i = 0; i < tz->num_trips; i++) {
+	for (i = 0; i < tz->num_trips; i++)
 		tze->trip_stats[i].min = INT_MAX;
-		tze->trip_stats[i].max = INT_MIN;
-	}
 
 	return tze;
 }
@@ -729,11 +728,13 @@ void thermal_debug_update_trip_stats(str
 
 	tze = list_first_entry(&tz_dbg->tz_episodes, struct tz_episode, node);
 
+	if (tz->temperature > tze->max_temp)
+		tze->max_temp = tz->temperature;
+
 	for (i = 0; i < tz_dbg->nr_trips; i++) {
 		int trip_id = tz_dbg->trips_crossed[i];
 		struct trip_stats *trip_stats = &tze->trip_stats[trip_id];
 
-		trip_stats->max = max(trip_stats->max, tz->temperature);
 		trip_stats->min = min(trip_stats->min, tz->temperature);
 		trip_stats->avg += (tz->temperature - trip_stats->avg) /
 					++trip_stats->count;
@@ -789,10 +790,10 @@ static int tze_seq_show(struct seq_file
 		c = '=';
 	}
 
-	seq_printf(s, ",-Mitigation at %llums, duration%c%llums\n",
-		   ktime_to_ms(tze->timestamp), c, duration_ms);
+	seq_printf(s, ",-Mitigation at %llums, duration%c%llums, max. temp=%dm°C\n",
+		   ktime_to_ms(tze->timestamp), c, duration_ms, tze->max_temp);
 
-	seq_printf(s, "| trip |     type | temp(m°C) | hyst(m°C) | duration(ms) |  avg(m°C) |  min(m°C) |  max(m°C) |\n");
+	seq_printf(s, "| trip |     type | temp(m°C) | hyst(m°C) | duration(ms) |  avg(m°C) |  min(m°C) |\n");
 
 	for_each_trip_desc(tz, td) {
 		const struct thermal_trip *trip = &td->trip;
@@ -814,7 +815,7 @@ static int tze_seq_show(struct seq_file
 		trip_stats = &tze->trip_stats[trip_id];
 
 		/* Skip trips without any stats. */
-		if (trip_stats->min > trip_stats->max)
+		if (trip_stats->min == INT_MAX)
 			continue;
 
 		if (trip->type == THERMAL_TRIP_PASSIVE)
@@ -837,15 +838,14 @@ static int tze_seq_show(struct seq_file
 			c = ' ';
 		}
 
-		seq_printf(s, "| %*d | %*s | %*d | %*d | %c%*lld | %*d | %*d | %*d |\n",
+		seq_printf(s, "| %*d | %*s | %*d | %*d | %c%*lld | %*d | %*d |\n",
 			   4 , trip_id,
 			   8, type,
 			   9, trip->temperature,
 			   9, trip->hysteresis,
 			   c, 11, duration_ms,
 			   9, trip_stats->avg,
-			   9, trip_stats->min,
-			   9, trip_stats->max);
+			   9, trip_stats->min);
 	}
 
 	return 0;