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| author | Sven Schnelle <svens@linux.ibm.com> | 2020-06-17 10:58:47 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2020-09-26 15:51:21 +0200 |
| commit | 4fb53dde770cc095a6e279ca9d9c72d49488cdb3 (patch) | |
| tree | 183528a751eebf149b7b41c2ea4be03d4b137aa0 /arch/s390 | |
| parent | s390/stp: add support for leap seconds (diff) | |
| download | linux-4fb53dde770cc095a6e279ca9d9c72d49488cdb3.tar.xz linux-4fb53dde770cc095a6e279ca9d9c72d49488cdb3.zip | |
s390/stp: add sysfs file to show scheduled leap seconds
This patch introduces /sys/devices/system/stp/scheduled_leap_seconds,
which will contain either 0,0 if no leap second is scheduled, or
the UTC timestamp + leap second offset.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/time.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index 49648d574b35..da271f8ec8d6 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -790,6 +790,34 @@ static ssize_t leap_seconds_show(struct device *dev, static DEVICE_ATTR_RO(leap_seconds); +static ssize_t leap_seconds_scheduled_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct stp_stzi stzi; + ssize_t ret; + + mutex_lock(&stp_work_mutex); + if (!stpinfo_valid() || !(stp_info.vbits & 0x8000) || !stp_info.lu) { + mutex_unlock(&stp_work_mutex); + return -ENODATA; + } + + ret = chsc_stzi(stp_page, &stzi, sizeof(stzi)); + mutex_unlock(&stp_work_mutex); + if (ret < 0) + return ret; + + if (!stzi.lsoib.p) + return sprintf(buf, "0,0\n"); + + return sprintf(buf, "%llu,%d\n", + tod_to_ns(stzi.lsoib.nlsout - TOD_UNIX_EPOCH) / NSEC_PER_SEC, + stzi.lsoib.nlso - stzi.lsoib.also); +} + +static DEVICE_ATTR_RO(leap_seconds_scheduled); + static ssize_t stratum_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -906,6 +934,7 @@ static struct device_attribute *stp_attributes[] = { &dev_attr_dst_offset, &dev_attr_leap_seconds, &dev_attr_online, + &dev_attr_leap_seconds_scheduled, &dev_attr_stratum, &dev_attr_time_offset, &dev_attr_time_zone_offset, |