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cbc134ad03
existing uses. Rename sysctl_handle_quad() to sysctl_handle_64().
957 lines
24 KiB
C
957 lines
24 KiB
C
/*-
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ntp.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/timepps.h>
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#include <sys/timetc.h>
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#include <sys/timex.h>
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/*
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* A large step happens on boot. This constant detects such steps.
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* It is relatively small so that ntp_update_second gets called enough
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* in the typical 'missed a couple of seconds' case, but doesn't loop
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* forever when the time step is large.
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*/
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#define LARGE_STEP 200
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/*
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* Implement a dummy timecounter which we can use until we get a real one
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* in the air. This allows the console and other early stuff to use
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* time services.
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*/
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static u_int
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dummy_get_timecount(struct timecounter *tc)
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{
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static u_int now;
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return (++now);
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}
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static struct timecounter dummy_timecounter = {
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dummy_get_timecount, 0, ~0u, 1000000, "dummy", -1000000
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};
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struct timehands {
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/* These fields must be initialized by the driver. */
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struct timecounter *th_counter;
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int64_t th_adjustment;
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uint64_t th_scale;
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u_int th_offset_count;
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struct bintime th_offset;
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struct timeval th_microtime;
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struct timespec th_nanotime;
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/* Fields not to be copied in tc_windup start with th_generation. */
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volatile u_int th_generation;
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struct timehands *th_next;
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};
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static struct timehands th0;
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static struct timehands th9 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th0};
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static struct timehands th8 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th9};
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static struct timehands th7 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th8};
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static struct timehands th6 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th7};
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static struct timehands th5 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th6};
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static struct timehands th4 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th5};
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static struct timehands th3 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th4};
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static struct timehands th2 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th3};
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static struct timehands th1 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th2};
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static struct timehands th0 = {
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&dummy_timecounter,
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0,
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(uint64_t)-1 / 1000000,
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0,
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{1, 0},
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{0, 0},
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{0, 0},
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1,
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&th1
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};
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static struct timehands *volatile timehands = &th0;
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struct timecounter *timecounter = &dummy_timecounter;
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static struct timecounter *timecounters = &dummy_timecounter;
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int tc_min_ticktock_freq = 1;
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time_t time_second = 1;
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time_t time_uptime = 1;
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struct bintime boottimebin;
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struct timeval boottime;
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static int sysctl_kern_boottime(SYSCTL_HANDLER_ARGS);
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SYSCTL_PROC(_kern, KERN_BOOTTIME, boottime, CTLTYPE_STRUCT|CTLFLAG_RD,
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NULL, 0, sysctl_kern_boottime, "S,timeval", "System boottime");
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SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, "");
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SYSCTL_NODE(_kern_timecounter, OID_AUTO, tc, CTLFLAG_RW, 0, "");
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static int timestepwarnings;
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SYSCTL_INT(_kern_timecounter, OID_AUTO, stepwarnings, CTLFLAG_RW,
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×tepwarnings, 0, "Log time steps");
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static void tc_windup(void);
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static void cpu_tick_calibrate(int);
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static int
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sysctl_kern_boottime(SYSCTL_HANDLER_ARGS)
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{
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#ifdef SCTL_MASK32
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int tv[2];
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if (req->flags & SCTL_MASK32) {
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tv[0] = boottime.tv_sec;
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tv[1] = boottime.tv_usec;
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return SYSCTL_OUT(req, tv, sizeof(tv));
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} else
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#endif
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return SYSCTL_OUT(req, &boottime, sizeof(boottime));
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}
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static int
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sysctl_kern_timecounter_get(SYSCTL_HANDLER_ARGS)
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{
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u_int ncount;
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struct timecounter *tc = arg1;
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ncount = tc->tc_get_timecount(tc);
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return sysctl_handle_int(oidp, &ncount, 0, req);
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}
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static int
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sysctl_kern_timecounter_freq(SYSCTL_HANDLER_ARGS)
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{
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uint64_t freq;
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struct timecounter *tc = arg1;
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freq = tc->tc_frequency;
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return sysctl_handle_64(oidp, &freq, 0, req);
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}
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/*
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* Return the difference between the timehands' counter value now and what
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* was when we copied it to the timehands' offset_count.
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*/
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static __inline u_int
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tc_delta(struct timehands *th)
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{
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struct timecounter *tc;
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tc = th->th_counter;
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return ((tc->tc_get_timecount(tc) - th->th_offset_count) &
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tc->tc_counter_mask);
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}
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/*
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* Functions for reading the time. We have to loop until we are sure that
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* the timehands that we operated on was not updated under our feet. See
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* the comment in <sys/time.h> for a description of these 12 functions.
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*/
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void
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binuptime(struct bintime *bt)
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{
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struct timehands *th;
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u_int gen;
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do {
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th = timehands;
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gen = th->th_generation;
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*bt = th->th_offset;
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bintime_addx(bt, th->th_scale * tc_delta(th));
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} while (gen == 0 || gen != th->th_generation);
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}
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void
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nanouptime(struct timespec *tsp)
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{
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struct bintime bt;
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binuptime(&bt);
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bintime2timespec(&bt, tsp);
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}
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void
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microuptime(struct timeval *tvp)
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{
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struct bintime bt;
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binuptime(&bt);
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bintime2timeval(&bt, tvp);
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}
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void
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bintime(struct bintime *bt)
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{
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binuptime(bt);
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bintime_add(bt, &boottimebin);
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}
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void
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nanotime(struct timespec *tsp)
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{
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struct bintime bt;
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bintime(&bt);
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bintime2timespec(&bt, tsp);
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}
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void
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microtime(struct timeval *tvp)
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{
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struct bintime bt;
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bintime(&bt);
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bintime2timeval(&bt, tvp);
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}
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void
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getbinuptime(struct bintime *bt)
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{
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struct timehands *th;
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u_int gen;
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do {
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th = timehands;
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gen = th->th_generation;
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*bt = th->th_offset;
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} while (gen == 0 || gen != th->th_generation);
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}
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void
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getnanouptime(struct timespec *tsp)
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{
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struct timehands *th;
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u_int gen;
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do {
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th = timehands;
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gen = th->th_generation;
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bintime2timespec(&th->th_offset, tsp);
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} while (gen == 0 || gen != th->th_generation);
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}
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void
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getmicrouptime(struct timeval *tvp)
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{
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struct timehands *th;
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u_int gen;
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do {
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th = timehands;
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gen = th->th_generation;
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bintime2timeval(&th->th_offset, tvp);
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} while (gen == 0 || gen != th->th_generation);
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}
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void
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getbintime(struct bintime *bt)
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{
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struct timehands *th;
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u_int gen;
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do {
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th = timehands;
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gen = th->th_generation;
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*bt = th->th_offset;
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} while (gen == 0 || gen != th->th_generation);
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bintime_add(bt, &boottimebin);
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}
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void
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getnanotime(struct timespec *tsp)
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{
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struct timehands *th;
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u_int gen;
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do {
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th = timehands;
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gen = th->th_generation;
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*tsp = th->th_nanotime;
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} while (gen == 0 || gen != th->th_generation);
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}
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void
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getmicrotime(struct timeval *tvp)
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{
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struct timehands *th;
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u_int gen;
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do {
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th = timehands;
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gen = th->th_generation;
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*tvp = th->th_microtime;
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} while (gen == 0 || gen != th->th_generation);
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}
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/*
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* Initialize a new timecounter and possibly use it.
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*/
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void
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tc_init(struct timecounter *tc)
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{
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u_int u;
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struct sysctl_oid *tc_root;
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u = tc->tc_frequency / tc->tc_counter_mask;
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/* XXX: We need some margin here, 10% is a guess */
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u *= 11;
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u /= 10;
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if (u > hz && tc->tc_quality >= 0) {
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tc->tc_quality = -2000;
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if (bootverbose) {
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printf("Timecounter \"%s\" frequency %ju Hz",
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tc->tc_name, (uintmax_t)tc->tc_frequency);
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printf(" -- Insufficient hz, needs at least %u\n", u);
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}
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} else if (tc->tc_quality >= 0 || bootverbose) {
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printf("Timecounter \"%s\" frequency %ju Hz quality %d\n",
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tc->tc_name, (uintmax_t)tc->tc_frequency,
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tc->tc_quality);
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}
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tc->tc_next = timecounters;
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timecounters = tc;
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/*
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* Set up sysctl tree for this counter.
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*/
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tc_root = SYSCTL_ADD_NODE(NULL,
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SYSCTL_STATIC_CHILDREN(_kern_timecounter_tc), OID_AUTO, tc->tc_name,
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CTLFLAG_RW, 0, "timecounter description");
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SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
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"mask", CTLFLAG_RD, &(tc->tc_counter_mask), 0,
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"mask for implemented bits");
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SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
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"counter", CTLTYPE_UINT | CTLFLAG_RD, tc, sizeof(*tc),
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sysctl_kern_timecounter_get, "IU", "current timecounter value");
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SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
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"frequency", CTLTYPE_U64 | CTLFLAG_RD, tc, sizeof(*tc),
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sysctl_kern_timecounter_freq, "QU", "timecounter frequency");
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
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"quality", CTLFLAG_RD, &(tc->tc_quality), 0,
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"goodness of time counter");
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/*
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* Never automatically use a timecounter with negative quality.
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* Even though we run on the dummy counter, switching here may be
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* worse since this timecounter may not be monotonous.
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*/
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if (tc->tc_quality < 0)
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return;
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if (tc->tc_quality < timecounter->tc_quality)
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return;
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if (tc->tc_quality == timecounter->tc_quality &&
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tc->tc_frequency < timecounter->tc_frequency)
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return;
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(void)tc->tc_get_timecount(tc);
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(void)tc->tc_get_timecount(tc);
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timecounter = tc;
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}
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/* Report the frequency of the current timecounter. */
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uint64_t
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tc_getfrequency(void)
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{
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return (timehands->th_counter->tc_frequency);
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}
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/*
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* Step our concept of UTC. This is done by modifying our estimate of
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* when we booted.
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* XXX: not locked.
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*/
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void
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tc_setclock(struct timespec *ts)
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{
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struct timespec tbef, taft;
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struct bintime bt, bt2;
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cpu_tick_calibrate(1);
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nanotime(&tbef);
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timespec2bintime(ts, &bt);
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binuptime(&bt2);
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bintime_sub(&bt, &bt2);
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bintime_add(&bt2, &boottimebin);
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boottimebin = bt;
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bintime2timeval(&bt, &boottime);
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/* XXX fiddle all the little crinkly bits around the fiords... */
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tc_windup();
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nanotime(&taft);
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if (timestepwarnings) {
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log(LOG_INFO,
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"Time stepped from %jd.%09ld to %jd.%09ld (%jd.%09ld)\n",
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(intmax_t)tbef.tv_sec, tbef.tv_nsec,
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(intmax_t)taft.tv_sec, taft.tv_nsec,
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(intmax_t)ts->tv_sec, ts->tv_nsec);
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}
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cpu_tick_calibrate(1);
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}
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/*
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* Initialize the next struct timehands in the ring and make
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* it the active timehands. Along the way we might switch to a different
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* timecounter and/or do seconds processing in NTP. Slightly magic.
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*/
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static void
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tc_windup(void)
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{
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struct bintime bt;
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struct timehands *th, *tho;
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uint64_t scale;
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u_int delta, ncount, ogen;
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int i;
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time_t t;
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/*
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* Make the next timehands a copy of the current one, but do not
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* overwrite the generation or next pointer. While we update
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* the contents, the generation must be zero.
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*/
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tho = timehands;
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th = tho->th_next;
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ogen = th->th_generation;
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th->th_generation = 0;
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bcopy(tho, th, offsetof(struct timehands, th_generation));
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/*
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* Capture a timecounter delta on the current timecounter and if
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* changing timecounters, a counter value from the new timecounter.
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* Update the offset fields accordingly.
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*/
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delta = tc_delta(th);
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if (th->th_counter != timecounter)
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ncount = timecounter->tc_get_timecount(timecounter);
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else
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ncount = 0;
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th->th_offset_count += delta;
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th->th_offset_count &= th->th_counter->tc_counter_mask;
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while (delta > th->th_counter->tc_frequency) {
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/* Eat complete unadjusted seconds. */
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delta -= th->th_counter->tc_frequency;
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th->th_offset.sec++;
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}
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if ((delta > th->th_counter->tc_frequency / 2) &&
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(th->th_scale * delta < ((uint64_t)1 << 63))) {
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/* The product th_scale * delta just barely overflows. */
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th->th_offset.sec++;
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}
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bintime_addx(&th->th_offset, th->th_scale * delta);
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/*
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* Hardware latching timecounters may not generate interrupts on
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* PPS events, so instead we poll them. There is a finite risk that
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* the hardware might capture a count which is later than the one we
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* got above, and therefore possibly in the next NTP second which might
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* have a different rate than the current NTP second. It doesn't
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* matter in practice.
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*/
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if (tho->th_counter->tc_poll_pps)
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tho->th_counter->tc_poll_pps(tho->th_counter);
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/*
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* Deal with NTP second processing. The for loop normally
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* iterates at most once, but in extreme situations it might
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* keep NTP sane if timeouts are not run for several seconds.
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* At boot, the time step can be large when the TOD hardware
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* has been read, so on really large steps, we call
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* ntp_update_second only twice. We need to call it twice in
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* case we missed a leap second.
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*/
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bt = th->th_offset;
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bintime_add(&bt, &boottimebin);
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i = bt.sec - tho->th_microtime.tv_sec;
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if (i > LARGE_STEP)
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i = 2;
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for (; i > 0; i--) {
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t = bt.sec;
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ntp_update_second(&th->th_adjustment, &bt.sec);
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if (bt.sec != t)
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boottimebin.sec += bt.sec - t;
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}
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/* Update the UTC timestamps used by the get*() functions. */
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/* XXX shouldn't do this here. Should force non-`get' versions. */
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bintime2timeval(&bt, &th->th_microtime);
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bintime2timespec(&bt, &th->th_nanotime);
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/* Now is a good time to change timecounters. */
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if (th->th_counter != timecounter) {
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th->th_counter = timecounter;
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th->th_offset_count = ncount;
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tc_min_ticktock_freq = max(1, timecounter->tc_frequency /
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(((uint64_t)timecounter->tc_counter_mask + 1) / 3));
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}
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/*-
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* Recalculate the scaling factor. We want the number of 1/2^64
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* fractions of a second per period of the hardware counter, taking
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* into account the th_adjustment factor which the NTP PLL/adjtime(2)
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* processing provides us with.
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*
|
|
* The th_adjustment is nanoseconds per second with 32 bit binary
|
|
* fraction and we want 64 bit binary fraction of second:
|
|
*
|
|
* x = a * 2^32 / 10^9 = a * 4.294967296
|
|
*
|
|
* The range of th_adjustment is +/- 5000PPM so inside a 64bit int
|
|
* we can only multiply by about 850 without overflowing, that
|
|
* leaves no suitably precise fractions for multiply before divide.
|
|
*
|
|
* Divide before multiply with a fraction of 2199/512 results in a
|
|
* systematic undercompensation of 10PPM of th_adjustment. On a
|
|
* 5000PPM adjustment this is a 0.05PPM error. This is acceptable.
|
|
*
|
|
* We happily sacrifice the lowest of the 64 bits of our result
|
|
* to the goddess of code clarity.
|
|
*
|
|
*/
|
|
scale = (uint64_t)1 << 63;
|
|
scale += (th->th_adjustment / 1024) * 2199;
|
|
scale /= th->th_counter->tc_frequency;
|
|
th->th_scale = scale * 2;
|
|
|
|
/*
|
|
* Now that the struct timehands is again consistent, set the new
|
|
* generation number, making sure to not make it zero.
|
|
*/
|
|
if (++ogen == 0)
|
|
ogen = 1;
|
|
th->th_generation = ogen;
|
|
|
|
/* Go live with the new struct timehands. */
|
|
time_second = th->th_microtime.tv_sec;
|
|
time_uptime = th->th_offset.sec;
|
|
timehands = th;
|
|
}
|
|
|
|
/* Report or change the active timecounter hardware. */
|
|
static int
|
|
sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char newname[32];
|
|
struct timecounter *newtc, *tc;
|
|
int error;
|
|
|
|
tc = timecounter;
|
|
strlcpy(newname, tc->tc_name, sizeof(newname));
|
|
|
|
error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req);
|
|
if (error != 0 || req->newptr == NULL ||
|
|
strcmp(newname, tc->tc_name) == 0)
|
|
return (error);
|
|
for (newtc = timecounters; newtc != NULL; newtc = newtc->tc_next) {
|
|
if (strcmp(newname, newtc->tc_name) != 0)
|
|
continue;
|
|
|
|
/* Warm up new timecounter. */
|
|
(void)newtc->tc_get_timecount(newtc);
|
|
(void)newtc->tc_get_timecount(newtc);
|
|
|
|
timecounter = newtc;
|
|
return (0);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW,
|
|
0, 0, sysctl_kern_timecounter_hardware, "A",
|
|
"Timecounter hardware selected");
|
|
|
|
|
|
/* Report or change the active timecounter hardware. */
|
|
static int
|
|
sysctl_kern_timecounter_choice(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char buf[32], *spc;
|
|
struct timecounter *tc;
|
|
int error;
|
|
|
|
spc = "";
|
|
error = 0;
|
|
for (tc = timecounters; error == 0 && tc != NULL; tc = tc->tc_next) {
|
|
sprintf(buf, "%s%s(%d)",
|
|
spc, tc->tc_name, tc->tc_quality);
|
|
error = SYSCTL_OUT(req, buf, strlen(buf));
|
|
spc = " ";
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern_timecounter, OID_AUTO, choice, CTLTYPE_STRING | CTLFLAG_RD,
|
|
0, 0, sysctl_kern_timecounter_choice, "A", "Timecounter hardware detected");
|
|
|
|
/*
|
|
* RFC 2783 PPS-API implementation.
|
|
*/
|
|
|
|
int
|
|
pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
|
|
{
|
|
pps_params_t *app;
|
|
struct pps_fetch_args *fapi;
|
|
#ifdef PPS_SYNC
|
|
struct pps_kcbind_args *kapi;
|
|
#endif
|
|
|
|
KASSERT(pps != NULL, ("NULL pps pointer in pps_ioctl"));
|
|
switch (cmd) {
|
|
case PPS_IOC_CREATE:
|
|
return (0);
|
|
case PPS_IOC_DESTROY:
|
|
return (0);
|
|
case PPS_IOC_SETPARAMS:
|
|
app = (pps_params_t *)data;
|
|
if (app->mode & ~pps->ppscap)
|
|
return (EINVAL);
|
|
pps->ppsparam = *app;
|
|
return (0);
|
|
case PPS_IOC_GETPARAMS:
|
|
app = (pps_params_t *)data;
|
|
*app = pps->ppsparam;
|
|
app->api_version = PPS_API_VERS_1;
|
|
return (0);
|
|
case PPS_IOC_GETCAP:
|
|
*(int*)data = pps->ppscap;
|
|
return (0);
|
|
case PPS_IOC_FETCH:
|
|
fapi = (struct pps_fetch_args *)data;
|
|
if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
|
|
return (EINVAL);
|
|
if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
|
|
return (EOPNOTSUPP);
|
|
pps->ppsinfo.current_mode = pps->ppsparam.mode;
|
|
fapi->pps_info_buf = pps->ppsinfo;
|
|
return (0);
|
|
case PPS_IOC_KCBIND:
|
|
#ifdef PPS_SYNC
|
|
kapi = (struct pps_kcbind_args *)data;
|
|
/* XXX Only root should be able to do this */
|
|
if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
|
|
return (EINVAL);
|
|
if (kapi->kernel_consumer != PPS_KC_HARDPPS)
|
|
return (EINVAL);
|
|
if (kapi->edge & ~pps->ppscap)
|
|
return (EINVAL);
|
|
pps->kcmode = kapi->edge;
|
|
return (0);
|
|
#else
|
|
return (EOPNOTSUPP);
|
|
#endif
|
|
default:
|
|
return (ENOIOCTL);
|
|
}
|
|
}
|
|
|
|
void
|
|
pps_init(struct pps_state *pps)
|
|
{
|
|
pps->ppscap |= PPS_TSFMT_TSPEC;
|
|
if (pps->ppscap & PPS_CAPTUREASSERT)
|
|
pps->ppscap |= PPS_OFFSETASSERT;
|
|
if (pps->ppscap & PPS_CAPTURECLEAR)
|
|
pps->ppscap |= PPS_OFFSETCLEAR;
|
|
}
|
|
|
|
void
|
|
pps_capture(struct pps_state *pps)
|
|
{
|
|
struct timehands *th;
|
|
|
|
KASSERT(pps != NULL, ("NULL pps pointer in pps_capture"));
|
|
th = timehands;
|
|
pps->capgen = th->th_generation;
|
|
pps->capth = th;
|
|
pps->capcount = th->th_counter->tc_get_timecount(th->th_counter);
|
|
if (pps->capgen != th->th_generation)
|
|
pps->capgen = 0;
|
|
}
|
|
|
|
void
|
|
pps_event(struct pps_state *pps, int event)
|
|
{
|
|
struct bintime bt;
|
|
struct timespec ts, *tsp, *osp;
|
|
u_int tcount, *pcount;
|
|
int foff, fhard;
|
|
pps_seq_t *pseq;
|
|
|
|
KASSERT(pps != NULL, ("NULL pps pointer in pps_event"));
|
|
/* If the timecounter was wound up underneath us, bail out. */
|
|
if (pps->capgen == 0 || pps->capgen != pps->capth->th_generation)
|
|
return;
|
|
|
|
/* Things would be easier with arrays. */
|
|
if (event == PPS_CAPTUREASSERT) {
|
|
tsp = &pps->ppsinfo.assert_timestamp;
|
|
osp = &pps->ppsparam.assert_offset;
|
|
foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
|
|
fhard = pps->kcmode & PPS_CAPTUREASSERT;
|
|
pcount = &pps->ppscount[0];
|
|
pseq = &pps->ppsinfo.assert_sequence;
|
|
} else {
|
|
tsp = &pps->ppsinfo.clear_timestamp;
|
|
osp = &pps->ppsparam.clear_offset;
|
|
foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
|
|
fhard = pps->kcmode & PPS_CAPTURECLEAR;
|
|
pcount = &pps->ppscount[1];
|
|
pseq = &pps->ppsinfo.clear_sequence;
|
|
}
|
|
|
|
/*
|
|
* If the timecounter changed, we cannot compare the count values, so
|
|
* we have to drop the rest of the PPS-stuff until the next event.
|
|
*/
|
|
if (pps->ppstc != pps->capth->th_counter) {
|
|
pps->ppstc = pps->capth->th_counter;
|
|
*pcount = pps->capcount;
|
|
pps->ppscount[2] = pps->capcount;
|
|
return;
|
|
}
|
|
|
|
/* Convert the count to a timespec. */
|
|
tcount = pps->capcount - pps->capth->th_offset_count;
|
|
tcount &= pps->capth->th_counter->tc_counter_mask;
|
|
bt = pps->capth->th_offset;
|
|
bintime_addx(&bt, pps->capth->th_scale * tcount);
|
|
bintime_add(&bt, &boottimebin);
|
|
bintime2timespec(&bt, &ts);
|
|
|
|
/* If the timecounter was wound up underneath us, bail out. */
|
|
if (pps->capgen != pps->capth->th_generation)
|
|
return;
|
|
|
|
*pcount = pps->capcount;
|
|
(*pseq)++;
|
|
*tsp = ts;
|
|
|
|
if (foff) {
|
|
timespecadd(tsp, osp);
|
|
if (tsp->tv_nsec < 0) {
|
|
tsp->tv_nsec += 1000000000;
|
|
tsp->tv_sec -= 1;
|
|
}
|
|
}
|
|
#ifdef PPS_SYNC
|
|
if (fhard) {
|
|
uint64_t scale;
|
|
|
|
/*
|
|
* Feed the NTP PLL/FLL.
|
|
* The FLL wants to know how many (hardware) nanoseconds
|
|
* elapsed since the previous event.
|
|
*/
|
|
tcount = pps->capcount - pps->ppscount[2];
|
|
pps->ppscount[2] = pps->capcount;
|
|
tcount &= pps->capth->th_counter->tc_counter_mask;
|
|
scale = (uint64_t)1 << 63;
|
|
scale /= pps->capth->th_counter->tc_frequency;
|
|
scale *= 2;
|
|
bt.sec = 0;
|
|
bt.frac = 0;
|
|
bintime_addx(&bt, scale * tcount);
|
|
bintime2timespec(&bt, &ts);
|
|
hardpps(tsp, ts.tv_nsec + 1000000000 * ts.tv_sec);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Timecounters need to be updated every so often to prevent the hardware
|
|
* counter from overflowing. Updating also recalculates the cached values
|
|
* used by the get*() family of functions, so their precision depends on
|
|
* the update frequency.
|
|
*/
|
|
|
|
static int tc_tick;
|
|
SYSCTL_INT(_kern_timecounter, OID_AUTO, tick, CTLFLAG_RD, &tc_tick, 0,
|
|
"Approximate number of hardclock ticks in a millisecond");
|
|
|
|
void
|
|
tc_ticktock(int cnt)
|
|
{
|
|
static int count;
|
|
|
|
count += cnt;
|
|
if (count < tc_tick)
|
|
return;
|
|
count = 0;
|
|
tc_windup();
|
|
}
|
|
|
|
static void
|
|
inittimecounter(void *dummy)
|
|
{
|
|
u_int p;
|
|
|
|
/*
|
|
* Set the initial timeout to
|
|
* max(1, <approx. number of hardclock ticks in a millisecond>).
|
|
* People should probably not use the sysctl to set the timeout
|
|
* to smaller than its inital value, since that value is the
|
|
* smallest reasonable one. If they want better timestamps they
|
|
* should use the non-"get"* functions.
|
|
*/
|
|
if (hz > 1000)
|
|
tc_tick = (hz + 500) / 1000;
|
|
else
|
|
tc_tick = 1;
|
|
p = (tc_tick * 1000000) / hz;
|
|
printf("Timecounters tick every %d.%03u msec\n", p / 1000, p % 1000);
|
|
|
|
/* warm up new timecounter (again) and get rolling. */
|
|
(void)timecounter->tc_get_timecount(timecounter);
|
|
(void)timecounter->tc_get_timecount(timecounter);
|
|
tc_windup();
|
|
}
|
|
|
|
SYSINIT(timecounter, SI_SUB_CLOCKS, SI_ORDER_SECOND, inittimecounter, NULL);
|
|
|
|
/* Cpu tick handling -------------------------------------------------*/
|
|
|
|
static int cpu_tick_variable;
|
|
static uint64_t cpu_tick_frequency;
|
|
|
|
static uint64_t
|
|
tc_cpu_ticks(void)
|
|
{
|
|
static uint64_t base;
|
|
static unsigned last;
|
|
unsigned u;
|
|
struct timecounter *tc;
|
|
|
|
tc = timehands->th_counter;
|
|
u = tc->tc_get_timecount(tc) & tc->tc_counter_mask;
|
|
if (u < last)
|
|
base += (uint64_t)tc->tc_counter_mask + 1;
|
|
last = u;
|
|
return (u + base);
|
|
}
|
|
|
|
void
|
|
cpu_tick_calibration(void)
|
|
{
|
|
static time_t last_calib;
|
|
|
|
if (time_uptime != last_calib && !(time_uptime & 0xf)) {
|
|
cpu_tick_calibrate(0);
|
|
last_calib = time_uptime;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function gets called every 16 seconds on only one designated
|
|
* CPU in the system from hardclock() via cpu_tick_calibration()().
|
|
*
|
|
* Whenever the real time clock is stepped we get called with reset=1
|
|
* to make sure we handle suspend/resume and similar events correctly.
|
|
*/
|
|
|
|
static void
|
|
cpu_tick_calibrate(int reset)
|
|
{
|
|
static uint64_t c_last;
|
|
uint64_t c_this, c_delta;
|
|
static struct bintime t_last;
|
|
struct bintime t_this, t_delta;
|
|
uint32_t divi;
|
|
|
|
if (reset) {
|
|
/* The clock was stepped, abort & reset */
|
|
t_last.sec = 0;
|
|
return;
|
|
}
|
|
|
|
/* we don't calibrate fixed rate cputicks */
|
|
if (!cpu_tick_variable)
|
|
return;
|
|
|
|
getbinuptime(&t_this);
|
|
c_this = cpu_ticks();
|
|
if (t_last.sec != 0) {
|
|
c_delta = c_this - c_last;
|
|
t_delta = t_this;
|
|
bintime_sub(&t_delta, &t_last);
|
|
/*
|
|
* Headroom:
|
|
* 2^(64-20) / 16[s] =
|
|
* 2^(44) / 16[s] =
|
|
* 17.592.186.044.416 / 16 =
|
|
* 1.099.511.627.776 [Hz]
|
|
*/
|
|
divi = t_delta.sec << 20;
|
|
divi |= t_delta.frac >> (64 - 20);
|
|
c_delta <<= 20;
|
|
c_delta /= divi;
|
|
if (c_delta > cpu_tick_frequency) {
|
|
if (0 && bootverbose)
|
|
printf("cpu_tick increased to %ju Hz\n",
|
|
c_delta);
|
|
cpu_tick_frequency = c_delta;
|
|
}
|
|
}
|
|
c_last = c_this;
|
|
t_last = t_this;
|
|
}
|
|
|
|
void
|
|
set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var)
|
|
{
|
|
|
|
if (func == NULL) {
|
|
cpu_ticks = tc_cpu_ticks;
|
|
} else {
|
|
cpu_tick_frequency = freq;
|
|
cpu_tick_variable = var;
|
|
cpu_ticks = func;
|
|
}
|
|
}
|
|
|
|
uint64_t
|
|
cpu_tickrate(void)
|
|
{
|
|
|
|
if (cpu_ticks == tc_cpu_ticks)
|
|
return (tc_getfrequency());
|
|
return (cpu_tick_frequency);
|
|
}
|
|
|
|
/*
|
|
* We need to be slightly careful converting cputicks to microseconds.
|
|
* There is plenty of margin in 64 bits of microseconds (half a million
|
|
* years) and in 64 bits at 4 GHz (146 years), but if we do a multiply
|
|
* before divide conversion (to retain precision) we find that the
|
|
* margin shrinks to 1.5 hours (one millionth of 146y).
|
|
* With a three prong approach we never lose significant bits, no
|
|
* matter what the cputick rate and length of timeinterval is.
|
|
*/
|
|
|
|
uint64_t
|
|
cputick2usec(uint64_t tick)
|
|
{
|
|
|
|
if (tick > 18446744073709551LL) /* floor(2^64 / 1000) */
|
|
return (tick / (cpu_tickrate() / 1000000LL));
|
|
else if (tick > 18446744073709LL) /* floor(2^64 / 1000000) */
|
|
return ((tick * 1000LL) / (cpu_tickrate() / 1000LL));
|
|
else
|
|
return ((tick * 1000000LL) / cpu_tickrate());
|
|
}
|
|
|
|
cpu_tick_f *cpu_ticks = tc_cpu_ticks;
|