linux-kernel - [patch 15/26] timekeeping: Add PTP offset to timekeeper

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Message-ID: <20250513145137.563966518@linutronix.de>
Date: Tue, 13 May 2025 17:13:22 +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 15/26] timekeeping: Add PTP offset to timekeeper

This offset will be used in the time getters of independent PTP clocks. It
is added to the "monotonic" clock readout.

As independent PTP clocks do not utilize the offset fields of the core time
keeper, this is just an alias for offs_tai, so that the cache line layout
stays the same.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/timekeeper_internal.h |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -67,6 +67,7 @@ struct tk_read_base {
  * @offs_real:			Offset clock monotonic -> clock realtime
  * @offs_boot:			Offset clock monotonic -> clock boottime
  * @offs_tai:			Offset clock monotonic -> clock tai
+ * @offs_ptp:			Offset clock monotonic -> clock PTP
  * @coarse_nsec:		The nanoseconds part for coarse time getters
  * @id:				The timekeeper ID
  * @tkr_raw:			The readout base structure for CLOCK_MONOTONIC_RAW
@@ -139,7 +140,10 @@ struct timekeeper {
 	struct timespec64	wall_to_monotonic;
 	ktime_t			offs_real;
 	ktime_t			offs_boot;
-	ktime_t			offs_tai;
+	union {
+		ktime_t		offs_tai;
+		ktime_t		offs_ptp;
+	};
 	u32			coarse_nsec;
 	enum timekeeper_ids	id;