Go directly to the rtc for persistent wall clock time and print. Useful if REALTIME is required to be logged in a low level power management function or when clock activities are suspended. An aid to permit user space alignment of kernel activities.
Feature activated by CONFIG_RTC_SHOW_TIME. Signed-off-by: Mark Salyzyn <[email protected]> --- drivers/rtc/Kconfig | 11 +++++++++++ drivers/rtc/rtc-lib.c | 16 ++++++++++++++++ include/linux/rtc.h | 5 +++++ 3 files changed, 32 insertions(+) diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 72419ac2c52a..7c308605bf42 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -5,6 +5,17 @@ config RTC_LIB bool +config RTC_SHOW_TIME + bool "rtc_show_time instrumentation" + select RTC_LIB + help + Activate rtc_show_time(const char *msg) wall clock time + instrumentation. + + The instrumentation is used to help triage and synchronize + kernel logs using CLOCK_MONOTONIC and user space activity + logs utilizing CLOCK_REALTIME references. + config RTC_MC146818_LIB bool select RTC_LIB diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c index 1ae7da5cfc60..676d6a83e843 100644 --- a/drivers/rtc/rtc-lib.c +++ b/drivers/rtc/rtc-lib.c @@ -94,6 +94,22 @@ void rtc_time64_to_tm(time64_t time, struct rtc_time *tm) } EXPORT_SYMBOL(rtc_time64_to_tm); +#ifdef CONFIG_RTC_SHOW_TIME +void rtc_show_time(const char *prefix_msg) +{ + struct timespec ts; + struct rtc_time tm; + + getnstimeofday(&ts); + rtc_time_to_tm(ts.tv_sec, &tm); + pr_info("%s %d-%02d-%02d %02d:%02d:%02d.%09lu UTC\n", + prefix_msg ? prefix_msg : "Time:", + tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec); +} +EXPORT_SYMBOL(rtc_show_time); +#endif + /* * Does the rtc_time represent a valid date/time? */ diff --git a/include/linux/rtc.h b/include/linux/rtc.h index 0a0f0d14a5fb..bf625e023799 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -22,6 +22,11 @@ extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year extern int rtc_valid_tm(struct rtc_time *tm); extern time64_t rtc_tm_to_time64(struct rtc_time *tm); extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm); +#ifdef CONFIG_RTC_SHOW_TIME +extern void rtc_show_time(const char *prefix_msg); +#else +#define rtc_show_time(prefix_msg) +#endif ktime_t rtc_tm_to_ktime(struct rtc_time tm); struct rtc_time rtc_ktime_to_tm(ktime_t kt); -- 2.13.2.932.g7449e964c-goog
