linux-kernel - [patch 25/26] timekeeping: Provide update for PTP timekeepers

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Message-ID: <20250513145138.154416598@linutronix.de>
Date: Tue, 13 May 2025 17:13:42 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: netdev@...r.kernel.org,
 Richard Cochran <richardcochran@...il.com>,
 Christopher Hall <christopher.s.hall@...el.com>,
 David Zage <david.zage@...el.com>,
 John Stultz <jstultz@...gle.com>,
 Frederic Weisbecker <frederic@...nel.org>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Miroslav Lichvar <mlichvar@...hat.com>,
 Werner Abt <werner.abt@...nberg-usa.com>,
 David Woodhouse <dwmw2@...radead.org>,
 Stephen Boyd <sboyd@...nel.org>,
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 Kurt Kanzenbach <kurt@...utronix.de>,
 Nam Cao <namcao@...utronix.de>,
 Alex Gieringer <gieri@...utronix.de>
Subject: [patch 25/26] timekeeping: Provide update for PTP timekeepers

Update the PTP timekeepers periodically. For now this is tied to the system
timekeeper update from the tick. This might be revisited.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/timekeeping.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
---
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -130,9 +130,11 @@ static struct tk_fast tk_fast_raw  ____c
 
 #ifdef CONFIG_POSIX_PTP_CLOCKS
 static __init void tk_ptp_setup(void);
+static void tk_ptp_advance(void);
 static void tk_ptp_update_clocksource(void);
 #else
 static inline void tk_ptp_setup(void) { }
+static inline void tk_ptp_advance(void) { }
 static inline void tk_ptp_update_clocksource(void) { }
 #endif
 
@@ -2312,11 +2314,13 @@ static bool timekeeping_advance(enum tim
 /**
  * update_wall_time - Uses the current clocksource to increment the wall time
  *
+ * It also updates eventually installed PTP clock timekeepers
  */
 void update_wall_time(void)
 {
 	if (timekeeping_advance(TK_ADV_TICK))
 		clock_was_set_delayed();
+	tk_ptp_advance();
 }
 
 /**
@@ -2762,6 +2766,20 @@ static void tk_ptp_update_clocksource(vo
 	}
 }
 
+static void tk_ptp_advance(void)
+{
+	unsigned long active = READ_ONCE(ptp_timekeepers);
+	unsigned int id;
+
+	for_each_set_bit(id, &active, BITS_PER_LONG) {
+		struct tk_data *tkd = &timekeeper_data[id + TIMEKEEPER_PTP];
+
+		guard(raw_spinlock)(&tkd->lock);
+		if (tkd->shadow_timekeeper.clock_valid)
+			__timekeeping_advance(tkd, TK_ADV_TICK);
+	}
+}
+
 /**
  * ktime_get_ptp - Get TAI time for a PTP clock
  * @id:	ID of the clock to read (CLOCK_PTP...)