[PATCHv3,net-next,1/3] ptp: add new method ptp_gettimex64any()
Commit Message
The current method that gets pre/post timestamps for PHC-read
supports only CLOCK_REALTIME timebase while most of the systems
have their clock disciplined by NTP service. There are applications
that can benefit from pre/post timestamps that are not changing
or have different timebases.
This patch adds the new API ptp_gettimex64any() which allows user
to specify the timebase for these pre/post timestamps. The options
supported are CLOCK_REALTIME, CLOCK_MONOTONIC, and CLOCK_MONOTONIC_RAW
Option of CLOCK_REALTIME is equivalent to using ptp_gettimex64().
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
CC: Richard Cochran <richardcochran@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: John Stultz <jstultz@google.com>
CC: Jakub Kicinski <kuba@kernel.org>
CC: "Willem de Bruijn" <willemb@google.com>
CC: netdev@vger.kernel.org
---
include/linux/ptp_clock_kernel.h | 50 ++++++++++++++++++++++++++++++--
1 file changed, 48 insertions(+), 2 deletions(-)
@@ -102,6 +102,17 @@ 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 clkid: any one of the supported clockids
+ * (CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW)
+ *
* @getcrosststamp: Reads the current time from the hardware clock and
* system clock simultaneously.
* parameter cts: Contains timestamp (device,system) pair,
@@ -180,6 +191,10 @@ 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,
+ clockid_t clockid);
int (*getcrosststamp)(struct ptp_clock_info *ptp,
struct system_device_crosststamp *cts);
int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
@@ -452,16 +467,47 @@ static inline ktime_t ptp_convert_timestamp(const ktime_t *hwtstamp,
#endif
+static inline void ptp_read_any_ts64(struct timespec64 *ts,
+ clockid_t clkid)
+{
+ switch (clkid) {
+ case CLOCK_REALTIME:
+ ktime_get_real_ts64(ts);
+ break;
+ case CLOCK_MONOTONIC:
+ ktime_get_ts64(ts);
+ break;
+ case CLOCK_MONOTONIC_RAW:
+ ktime_get_raw_ts64(ts);
+ break;
+ default:
+ break;
+ }
+}
+
static inline void ptp_read_system_prets(struct ptp_system_timestamp *sts)
{
if (sts)
- ktime_get_real_ts64(&sts->pre_ts);
+ ptp_read_any_ts64(&sts->pre_ts, CLOCK_REALTIME);
}
static inline void ptp_read_system_postts(struct ptp_system_timestamp *sts)
{
if (sts)
- ktime_get_real_ts64(&sts->post_ts);
+ ptp_read_any_ts64(&sts->pre_ts, CLOCK_REALTIME);
}
+static inline void ptp_read_any_prets(struct ptp_system_timestamp *sts,
+ clockid_t clkid)
+{
+ if (sts)
+ ptp_read_any_ts64(&sts->pre_ts, clkid);
+}
+
+static inline void ptp_read_any_postts(struct ptp_system_timestamp *sts,
+ clockid_t clkid)
+{
+ if (sts)
+ ptp_read_any_ts64(&sts->post_ts, clkid);
+}
#endif