Add a couple of strategic sysctls for monitoring.
In the rather obscure case of hardpps(), use a type-II PLL if the external signal is phase locked, but a FLL if it isn't.
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7fd299cb92
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=56458
@ -146,6 +146,7 @@ static long time_reftime; /* time at last adjustment (s) */
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static long time_tick; /* nanoseconds per tick (ns) */
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static l_fp time_offset; /* time offset (ns) */
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static l_fp time_freq; /* frequency offset (ns/s) */
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static l_fp time_adj; /* resulting adjustment */
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#ifdef PPS_SYNC
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/*
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@ -173,6 +174,7 @@ static int pps_valid; /* signal watchdog counter */
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static int pps_shift = PPS_FAVG; /* interval duration (s) (shift) */
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static int pps_shiftmax = PPS_FAVGDEF; /* max interval duration (s) (shift) */
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static int pps_intcnt; /* wander counter */
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static int pps_letgo; /* PLL frequency hold-off */
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/*
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* PPS signal quality monitors
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@ -247,6 +249,10 @@ SYSCTL_PROC(_kern_ntp_pll, OID_AUTO, gettime, CTLTYPE_OPAQUE|CTLFLAG_RD,
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#ifdef PPS_SYNC
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SYSCTL_INT(_kern_ntp_pll, OID_AUTO, pps_shiftmax, CTLFLAG_RW, &pps_shiftmax, 0, "");
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SYSCTL_INT(_kern_ntp_pll, OID_AUTO, pps_shift, CTLFLAG_RW, &pps_shift, 0, "");
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SYSCTL_OPAQUE(_kern_ntp_pll, OID_AUTO, pps_freq, CTLFLAG_RD, &pps_freq, sizeof(pps_freq), "I", "");
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SYSCTL_OPAQUE(_kern_ntp_pll, OID_AUTO, time_freq, CTLFLAG_RD, &time_freq, sizeof(time_freq), "I", "");
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SYSCTL_OPAQUE(_kern_ntp_pll, OID_AUTO, pps_offset, CTLFLAG_RD, &pps_offset, sizeof(pps_offset), "I", "");
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#endif
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/*
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* ntp_adjtime() - NTP daemon application interface
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@ -402,7 +408,6 @@ void
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ntp_update_second(struct timecounter *tcp)
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{
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u_int32_t *newsec;
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l_fp time_adj; /* 32/64-bit temporaries */
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newsec = &tcp->tc_offset_sec;
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/*
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@ -647,7 +652,7 @@ hardpps(tsp, nsec)
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struct timespec *tsp; /* time at PPS */
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long nsec; /* hardware counter at PPS */
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{
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long u_sec, u_nsec, v_nsec; /* temps */
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long u_sec, u_nsec, v_nsec, w_nsec; /* temps */
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l_fp ftemp;
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/*
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@ -738,6 +743,19 @@ hardpps(tsp, nsec)
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} else if (time_status & STA_PPSTIME) {
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L_LINT(time_offset, -v_nsec);
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L_LINT(pps_offset, -v_nsec);
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if (pps_letgo >= 2) {
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L_LINT(ftemp, -v_nsec);
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L_RSHIFT(ftemp, (pps_shift * 2));
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L_ADD(ftemp, time_freq);
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w_nsec = L_GINT(ftemp);
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if (w_nsec > MAXFREQ)
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L_LINT(ftemp, MAXFREQ);
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else if (w_nsec < -MAXFREQ)
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L_LINT(ftemp, -MAXFREQ);
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time_freq = ftemp;
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}
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}
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pps_jitter += (u_nsec - pps_jitter) >> PPS_FAVG;
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u_sec = pps_tf[0].tv_sec - pps_lastsec;
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@ -794,7 +812,10 @@ hardpps(tsp, nsec)
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} else {
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pps_intcnt++;
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}
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if (pps_shift > pps_shiftmax) {
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if (!(time_status & STA_PPSFREQ)) {
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pps_intcnt = 0;
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pps_shift = PPS_FAVG;
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} else if (pps_shift > pps_shiftmax) {
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/* If we lowered pps_shiftmax */
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pps_shift = pps_shiftmax;
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pps_intcnt = 0;
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@ -826,7 +847,12 @@ hardpps(tsp, nsec)
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L_LINT(pps_freq, MAXFREQ);
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else if (u_nsec < -MAXFREQ)
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L_LINT(pps_freq, -MAXFREQ);
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if (time_status & STA_PPSFREQ)
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if ((time_status & (STA_PPSFREQ | STA_PPSTIME)) == STA_PPSFREQ) {
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pps_letgo = 0;
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time_freq = pps_freq;
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} else if (time_status & STA_PPSTIME) {
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if (pps_letgo < 2)
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pps_letgo++;
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}
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}
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#endif /* PPS_SYNC */
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