The patch titled
pps: capture MONOTONIC_RAW timestamps as well
has been added to the -mm tree. Its filename is
pps-capture-monotonic_raw-timestamps-as-well.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: pps: capture MONOTONIC_RAW timestamps as well
From: Alexander Gordeev <lasaine@xxxxxxxxxxxxx>
MONOTONIC_RAW clock timestamps are ideally suited for frequency
calculation and also fit well into the original NTP hardpps design. Now
phase and frequency can be adjusted separately: the former based on
REALTIME clock and the latter based on MONOTONIC_RAW clock. A new
function getnstime_raw_and_real is added to timekeeping subsystem to
capture both timestamps at the same time and atomically.
Signed-off-by: Alexander Gordeev <lasaine@xxxxxxxxxxxxx>
Cc: "Nikita V. Youshchenko" <yoush@xxxxxxxxx>
Cc: Rodolfo Giometti <giometti@xxxxxxxxxxxx>
Cc: john stultz <johnstul@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Joonwoo Park <joonwpark81@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pps_kernel.h | 3 ++-
include/linux/time.h | 2 ++
kernel/time/timekeeping.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 38 insertions(+), 1 deletion(-)
diff -puN include/linux/pps_kernel.h~pps-capture-monotonic_raw-timestamps-as-well include/linux/pps_kernel.h
--- a/include/linux/pps_kernel.h~pps-capture-monotonic_raw-timestamps-as-well
+++ a/include/linux/pps_kernel.h
@@ -48,6 +48,7 @@ struct pps_source_info {
};
struct pps_event_time {
+ struct timespec ts_raw;
struct timespec ts_real;
};
@@ -111,7 +112,7 @@ static inline void timespec_to_pps_ktime
static inline void pps_get_ts(struct pps_event_time *ts)
{
- getnstimeofday(&ts->ts_real);
+ getnstime_raw_and_real(&ts->ts_raw, &ts->ts_real);
}
#endif /* LINUX_PPS_KERNEL_H */
diff -puN include/linux/time.h~pps-capture-monotonic_raw-timestamps-as-well include/linux/time.h
--- a/include/linux/time.h~pps-capture-monotonic_raw-timestamps-as-well
+++ a/include/linux/time.h
@@ -158,6 +158,8 @@ extern unsigned int alarm_setitimer(unsi
extern int do_getitimer(int which, struct itimerval *value);
extern void getnstimeofday(struct timespec *tv);
extern void getrawmonotonic(struct timespec *ts);
+extern void getnstime_raw_and_real(struct timespec *ts_raw,
+ struct timespec *ts_real);
extern void getboottime(struct timespec *ts);
extern void monotonic_to_bootbased(struct timespec *ts);
diff -puN kernel/time/timekeeping.c~pps-capture-monotonic_raw-timestamps-as-well kernel/time/timekeeping.c
--- a/kernel/time/timekeeping.c~pps-capture-monotonic_raw-timestamps-as-well
+++ a/kernel/time/timekeeping.c
@@ -285,6 +285,40 @@ void ktime_get_ts(struct timespec *ts)
EXPORT_SYMBOL_GPL(ktime_get_ts);
/**
+ * getnstime_raw_and_real - Returns both the time of day an raw
+ * monotonic time in a timespec format
+ * @ts_mono_raw: pointer to the timespec to be set to raw
+ * monotonic time
+ * @ts_real: pointer to the timespec to be set to the time
+ * of day
+ */
+void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
+{
+ unsigned long seq;
+ s64 nsecs_raw, nsecs_real;
+
+ WARN_ON(timekeeping_suspended);
+
+ do {
+ seq = read_seqbegin(&xtime_lock);
+
+ *ts_raw = raw_time;
+ *ts_real = xtime;
+
+ nsecs_raw = timekeeping_get_ns_raw();
+ nsecs_real = timekeeping_get_ns();
+
+ /* If arch requires, add in gettimeoffset() */
+ nsecs_real += arch_gettimeoffset();
+
+ } while (read_seqretry(&xtime_lock, seq));
+
+ timespec_add_ns(ts_raw, nsecs_raw);
+ timespec_add_ns(ts_real, nsecs_real);
+}
+EXPORT_SYMBOL(getnstime_raw_and_real);
+
+/**
* do_gettimeofday - Returns the time of day in a timeval
* @tv: pointer to the timeval to be set
*
_
Patches currently in -mm which might be from lasaine@xxxxxxxxxxxxx are
pps-trivial-fixes.patch
pps-declare-variables-where-they-are-used-in-switch.patch
pps-fix-race-in-pps_fetch-handler.patch
pps-unify-timestamp-gathering.patch
pps-access-pps-device-by-direct-pointer.patch
pps-convert-printk-pr_-to-dev_.patch
pps-move-idr-stuff-to-ppsc.patch
pps-add-async-pps-event-handler.patch
pps-dont-disable-interrupts-when-using-spin-locks.patch
pps-use-bug_on-for-kernel-api-safety-checks.patch
pps-simplify-conditions-a-bit.patch
ntp-add-hardpps-implementation.patch
pps-capture-monotonic_raw-timestamps-as-well.patch
pps-add-kernel-consumer-support.patch
pps-add-parallel-port-pps-client.patch
pps-add-parallel-port-pps-signal-generator.patch
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