linux-kernel - [PATCH 2/4] ptp: add ptp

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Message-ID: <20230929023740.1611161-1-maheshb@google.com>
Date:   Thu, 28 Sep 2023 19:37:40 -0700
From:   Mahesh Bandewar <maheshb@...gle.com>
To:     Netdev <netdev@...r.kernel.org>,
        Linux <linux-kernel@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Jonathan Corbet <corbet@....net>, Don Hatchett <hatch@...gle.com>,
        Yuliang Li <yuliangli@...gle.com>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Richard Cochran <richardcochran@...il.com>
Subject: [PATCH 2/4] ptp: add ptp_gettimex64any() support

add support for TS sandwich of the user preferred timebase. The options
supported are PTP_TS_REAL (CLOCK_REALTIME), PTP_TS_MONO (CLOCK_MONOTONIC),
PTP_TS_RAW (CLOCK_MONOTONIC_RAW), PTP_TS_CYCLES (raw-cycles)

The option PTP_TS_CYCLES will return the cycles in 'struct timespec64'
format so something equivalent of timespec64_to_ns() need to be applied to
covert back into cycles.

Option of PTP_TS_REAL is equivalent of using ptp_gettimex64().

Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
CC: Richard Cochran <richardcochran@...il.com>
CC: "David S. Miller" <davem@...emloft.net>
CC: netdev@...r.kernel.org
---
 include/linux/ptp_clock_kernel.h | 57 ++++++++++++++++++++++++++++++++
 include/uapi/linux/ptp_clock.h   |  8 +++++
 2 files changed, 65 insertions(+)

diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 1ef4e0f9bd2a..87e75354d687 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -102,6 +102,15 @@ struct ptp_system_timestamp {
  *               reading the lowest bits of the PHC timestamp and the second
  *               reading immediately follows that.
  *
+ * @gettimex64any:  Reads the current time from the hardware clock and
+                 optionally also any of the MONO, MONO_RAW, or SYS clock.
+ *               parameter ts: Holds the PHC timestamp.
+ *               parameter sts: If not NULL, it holds a pair of timestamps from
+ *               the clock of choice. The first reading is made right before
+ *               reading the lowest bits of the PHC timestamp and the second
+ *               reading immediately follows that.
+ *               parameter type: any one of the TS opt from ptp_timestamp_types.
+ *
  * @getcrosststamp:  Reads the current time from the hardware clock and
  *                   system clock simultaneously.
  *                   parameter cts: Contains timestamp (device,system) pair,
@@ -180,6 +189,9 @@ struct ptp_clock_info {
 	int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
 	int (*gettimex64)(struct ptp_clock_info *ptp, struct timespec64 *ts,
 			  struct ptp_system_timestamp *sts);
+	int (*gettimex64any)(struct ptp_clock_info *ptp, struct timespec64 *ts,
+			     struct ptp_system_timestamp *sts,
+			     enum ptp_ts_types type);
 	int (*getcrosststamp)(struct ptp_clock_info *ptp,
 			      struct system_device_crosststamp *cts);
 	int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
@@ -464,4 +476,49 @@ static inline void ptp_read_system_postts(struct ptp_system_timestamp *sts)
 		ktime_get_real_ts64(&sts->post_ts);
 }
 
+static inline void ptp_read_any_prets(struct ptp_system_timestamp *sts,
+				      enum ptp_ts_types type)
+{
+	if (sts) {
+		switch (type) {
+		case PTP_TS_CYCLES:
+			ktime_get_cycles64(&sts->pre_ts);
+			break;
+		case PTP_TS_REAL:
+			ktime_get_real_ts64(&sts->pre_ts);
+			break;
+		case PTP_TS_MONO:
+			ktime_get_ts64(&sts->pre_ts);
+			break;
+		case PTP_TS_RAW:
+			ktime_get_raw_ts64(&sts->pre_ts);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+static inline void ptp_read_any_postts(struct ptp_system_timestamp *sts,
+				       enum ptp_ts_types type)
+{
+	if (sts) {
+		switch (type) {
+		case PTP_TS_CYCLES:
+			ktime_get_cycles64(&sts->post_ts);
+			break;
+		case PTP_TS_REAL:
+			ktime_get_real_ts64(&sts->post_ts);
+			break;
+		case PTP_TS_MONO:
+			ktime_get_ts64(&sts->post_ts);
+			break;
+		case PTP_TS_RAW:
+			ktime_get_raw_ts64(&sts->post_ts);
+			break;
+		default:
+			break;
+		}
+	}
+}
 #endif
diff --git a/include/uapi/linux/ptp_clock.h b/include/uapi/linux/ptp_clock.h
index 05cc35fc94ac..1f1e98966cff 100644
--- a/include/uapi/linux/ptp_clock.h
+++ b/include/uapi/linux/ptp_clock.h
@@ -69,6 +69,14 @@
  */
 #define PTP_PEROUT_V1_VALID_FLAGS	(0)
 
+enum ptp_ts_types {
+	PTP_TS_CYCLES = 0,
+	PTP_TS_REAL,
+	PTP_TS_MONO,
+	PTP_TS_RAW,
+	PTP_TS_MAX,
+};
+
 /*
  * struct ptp_clock_time - represents a time value
  *
-- 
2.42.0.582.g8ccd20d70d-goog