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Diffstat (limited to 'kernel/time/ntp.c')
-rw-r--r--kernel/time/ntp.c105
1 files changed, 32 insertions, 73 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 072bb066bb7d..12ff13a838c6 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -18,13 +18,14 @@
#include <linux/rtc.h>
#include "tick-internal.h"
+#include "ntp_internal.h"
/*
* NTP timekeeping variables:
+ *
+ * Note: All of the NTP state is protected by the timekeeping locks.
*/
-DEFINE_RAW_SPINLOCK(ntp_lock);
-
/* USER_HZ period (usecs): */
unsigned long tick_usec = TICK_USEC;
@@ -53,9 +54,6 @@ static int time_state = TIME_OK;
/* clock status bits: */
static int time_status = STA_UNSYNC;
-/* TAI offset (secs): */
-static long time_tai;
-
/* time adjustment (nsecs): */
static s64 time_offset;
@@ -134,8 +132,6 @@ static inline void pps_reset_freq_interval(void)
/**
* pps_clear - Clears the PPS state variables
- *
- * Must be called while holding a write on the ntp_lock
*/
static inline void pps_clear(void)
{
@@ -150,8 +146,6 @@ static inline void pps_clear(void)
/* Decrease pps_valid to indicate that another second has passed since
* the last PPS signal. When it reaches 0, indicate that PPS signal is
* missing.
- *
- * Must be called while holding a write on the ntp_lock
*/
static inline void pps_dec_valid(void)
{
@@ -346,10 +340,6 @@ static void ntp_update_offset(long offset)
*/
void ntp_clear(void)
{
- unsigned long flags;
-
- raw_spin_lock_irqsave(&ntp_lock, flags);
-
time_adjust = 0; /* stop active adjtime() */
time_status |= STA_UNSYNC;
time_maxerror = NTP_PHASE_LIMIT;
@@ -362,20 +352,12 @@ void ntp_clear(void)
/* Clear PPS state variables */
pps_clear();
- raw_spin_unlock_irqrestore(&ntp_lock, flags);
-
}
u64 ntp_tick_length(void)
{
- unsigned long flags;
- s64 ret;
-
- raw_spin_lock_irqsave(&ntp_lock, flags);
- ret = tick_length;
- raw_spin_unlock_irqrestore(&ntp_lock, flags);
- return ret;
+ return tick_length;
}
@@ -393,9 +375,6 @@ int second_overflow(unsigned long secs)
{
s64 delta;
int leap = 0;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&ntp_lock, flags);
/*
* Leap second processing. If in leap-insert state at the end of the
@@ -415,7 +394,6 @@ int second_overflow(unsigned long secs)
else if (secs % 86400 == 0) {
leap = -1;
time_state = TIME_OOP;
- time_tai++;
printk(KERN_NOTICE
"Clock: inserting leap second 23:59:60 UTC\n");
}
@@ -425,7 +403,6 @@ int second_overflow(unsigned long secs)
time_state = TIME_OK;
else if ((secs + 1) % 86400 == 0) {
leap = 1;
- time_tai--;
time_state = TIME_WAIT;
printk(KERN_NOTICE
"Clock: deleting leap second 23:59:59 UTC\n");
@@ -479,8 +456,6 @@ int second_overflow(unsigned long secs)
time_adjust = 0;
out:
- raw_spin_unlock_irqrestore(&ntp_lock, flags);
-
return leap;
}
@@ -575,11 +550,10 @@ static inline void process_adj_status(struct timex *txc, struct timespec *ts)
time_status |= txc->status & ~STA_RONLY;
}
-/*
- * Called with ntp_lock held, so we can access and modify
- * all the global NTP state:
- */
-static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts)
+
+static inline void process_adjtimex_modes(struct timex *txc,
+ struct timespec *ts,
+ s32 *time_tai)
{
if (txc->modes & ADJ_STATUS)
process_adj_status(txc, ts);
@@ -613,7 +587,7 @@ static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts
}
if (txc->modes & ADJ_TAI && txc->constant > 0)
- time_tai = txc->constant;
+ *time_tai = txc->constant;
if (txc->modes & ADJ_OFFSET)
ntp_update_offset(txc->offset);
@@ -625,16 +599,13 @@ static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts
ntp_update_frequency();
}
-/*
- * adjtimex mainly allows reading (and writing, if superuser) of
- * kernel time-keeping variables. used by xntpd.
+
+
+/**
+ * ntp_validate_timex - Ensures the timex is ok for use in do_adjtimex
*/
-int do_adjtimex(struct timex *txc)
+int ntp_validate_timex(struct timex *txc)
{
- struct timespec ts;
- int result;
-
- /* Validate the data before disabling interrupts */
if (txc->modes & ADJ_ADJTIME) {
/* singleshot must not be used with any other mode bits */
if (!(txc->modes & ADJ_OFFSET_SINGLESHOT))
@@ -646,7 +617,6 @@ int do_adjtimex(struct timex *txc)
/* In order to modify anything, you gotta be super-user! */
if (txc->modes && !capable(CAP_SYS_TIME))
return -EPERM;
-
/*
* if the quartz is off by more than 10% then
* something is VERY wrong!
@@ -657,22 +627,20 @@ int do_adjtimex(struct timex *txc)
return -EINVAL;
}
- if (txc->modes & ADJ_SETOFFSET) {
- struct timespec delta;
- delta.tv_sec = txc->time.tv_sec;
- delta.tv_nsec = txc->time.tv_usec;
- if (!capable(CAP_SYS_TIME))
- return -EPERM;
- if (!(txc->modes & ADJ_NANO))
- delta.tv_nsec *= 1000;
- result = timekeeping_inject_offset(&delta);
- if (result)
- return result;
- }
+ if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME)))
+ return -EPERM;
- getnstimeofday(&ts);
+ return 0;
+}
- raw_spin_lock_irq(&ntp_lock);
+
+/*
+ * adjtimex mainly allows reading (and writing, if superuser) of
+ * kernel time-keeping variables. used by xntpd.
+ */
+int __do_adjtimex(struct timex *txc, struct timespec *ts, s32 *time_tai)
+{
+ int result;
if (txc->modes & ADJ_ADJTIME) {
long save_adjust = time_adjust;
@@ -687,7 +655,7 @@ int do_adjtimex(struct timex *txc)
/* If there are input parameters, then process them: */
if (txc->modes)
- process_adjtimex_modes(txc, &ts);
+ process_adjtimex_modes(txc, ts, time_tai);
txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
NTP_SCALE_SHIFT);
@@ -709,15 +677,13 @@ int do_adjtimex(struct timex *txc)
txc->precision = 1;
txc->tolerance = MAXFREQ_SCALED / PPM_SCALE;
txc->tick = tick_usec;
- txc->tai = time_tai;
+ txc->tai = *time_tai;
/* fill PPS status fields */
pps_fill_timex(txc);
- raw_spin_unlock_irq(&ntp_lock);
-
- txc->time.tv_sec = ts.tv_sec;
- txc->time.tv_usec = ts.tv_nsec;
+ txc->time.tv_sec = ts->tv_sec;
+ txc->time.tv_usec = ts->tv_nsec;
if (!(time_status & STA_NANO))
txc->time.tv_usec /= NSEC_PER_USEC;
@@ -894,7 +860,7 @@ static void hardpps_update_phase(long error)
}
/*
- * hardpps() - discipline CPU clock oscillator to external PPS signal
+ * __hardpps() - discipline CPU clock oscillator to external PPS signal
*
* This routine is called at each PPS signal arrival in order to
* discipline the CPU clock oscillator to the PPS signal. It takes two
@@ -905,15 +871,13 @@ static void hardpps_update_phase(long error)
* This code is based on David Mills's reference nanokernel
* implementation. It was mostly rewritten but keeps the same idea.
*/
-void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
+void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
{
struct pps_normtime pts_norm, freq_norm;
unsigned long flags;
pts_norm = pps_normalize_ts(*phase_ts);
- raw_spin_lock_irqsave(&ntp_lock, flags);
-
/* clear the error bits, they will be set again if needed */
time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
@@ -925,7 +889,6 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
* just start the frequency interval */
if (unlikely(pps_fbase.tv_sec == 0)) {
pps_fbase = *raw_ts;
- raw_spin_unlock_irqrestore(&ntp_lock, flags);
return;
}
@@ -940,7 +903,6 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
time_status |= STA_PPSJITTER;
/* restart the frequency calibration interval */
pps_fbase = *raw_ts;
- raw_spin_unlock_irqrestore(&ntp_lock, flags);
pr_err("hardpps: PPSJITTER: bad pulse\n");
return;
}
@@ -957,10 +919,7 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
hardpps_update_phase(pts_norm.nsec);
- raw_spin_unlock_irqrestore(&ntp_lock, flags);
}
-EXPORT_SYMBOL(hardpps);
-
#endif /* CONFIG_NTP_PPS */
static int __init ntp_tick_adj_setup(char *str)
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 14:17:35 +0000