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9bce0f05fe
- Wrap [get]{bin,nano,micro}[up]time() functions of sys/time.h to allow
requesting time from either the feedback or the feed-forward clock. If a
feedback (e.g. ntpd) and feed-forward (e.g. radclock) daemon are both running
on the system, both kernel clocks are updated but only one serves time.
- Add similar wrappers for the feed-forward difference clock.
Committed on behalf of Julien Ridoux and Darryl Veitch from the University of
Melbourne, Australia, as part of the FreeBSD Foundation funded "Feed-Forward
Clock Synchronization Algorithms" project.
For more information, see http://www.synclab.org/radclock/
Submitted by: Julien Ridoux (jridoux at unimelb edu au)
344 lines
9.0 KiB
C
344 lines
9.0 KiB
C
/*-
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* Copyright (c) 2011 The University of Melbourne
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* All rights reserved.
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*
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* This software was developed by Julien Ridoux at the University of Melbourne
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/timeffc.h>
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extern struct ffclock_estimate ffclock_estimate;
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extern struct bintime ffclock_boottime;
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/*
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* Feed-forward clock absolute time. This should be the preferred way to read
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* the feed-forward clock for "wall-clock" type time. The flags allow to compose
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* various flavours of absolute time (e.g. with or without leap seconds taken
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* into account). If valid pointers are provided, the ffcounter value and an
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* upper bound on clock error associated with the bintime are provided.
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* NOTE: use ffclock_convert_abs() to differ the conversion of a ffcounter value
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* read earlier.
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*/
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void
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ffclock_abstime(ffcounter *ffcount, struct bintime *bt,
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struct bintime *error_bound, uint32_t flags)
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{
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struct ffclock_estimate cest;
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ffcounter ffc;
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ffcounter update_ffcount;
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ffcounter ffdelta_error;
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/* Get counter and corresponding time. */
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if ((flags & FFCLOCK_FAST) == FFCLOCK_FAST)
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ffclock_last_tick(&ffc, bt, flags);
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else {
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ffclock_read_counter(&ffc);
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ffclock_convert_abs(ffc, bt, flags);
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}
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/* Current ffclock estimate, use update_ffcount as generation number. */
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do {
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update_ffcount = ffclock_estimate.update_ffcount;
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bcopy(&ffclock_estimate, &cest, sizeof(struct ffclock_estimate));
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} while (update_ffcount != ffclock_estimate.update_ffcount);
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/*
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* Leap second adjustment. Total as seen by synchronisation algorithm
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* since it started. cest.leapsec_next is the ffcounter prediction of
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* when the next leapsecond occurs.
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*/
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if ((flags & FFCLOCK_LEAPSEC) == FFCLOCK_LEAPSEC) {
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bt->sec -= cest.leapsec_total;
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if (ffc > cest.leapsec_next)
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bt->sec -= cest.leapsec;
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}
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/* Boot time adjustment, for uptime/monotonic clocks. */
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if ((flags & FFCLOCK_UPTIME) == FFCLOCK_UPTIME) {
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bintime_sub(bt, &ffclock_boottime);
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}
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/* Compute error bound if a valid pointer has been passed. */
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if (error_bound) {
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ffdelta_error = ffc - cest.update_ffcount;
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ffclock_convert_diff(ffdelta_error, error_bound);
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/* 18446744073709 = int(2^64/1e12), err_bound_rate in [ps/s] */
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bintime_mul(error_bound, cest.errb_rate *
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(uint64_t)18446744073709LL);
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/* 18446744073 = int(2^64 / 1e9), since err_abs in [ns] */
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bintime_addx(error_bound, cest.errb_abs *
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(uint64_t)18446744073LL);
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}
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if (ffcount)
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*ffcount = ffc;
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}
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/*
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* Feed-forward difference clock. This should be the preferred way to convert a
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* time interval in ffcounter values into a time interval in seconds. If a valid
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* pointer is passed, an upper bound on the error in computing the time interval
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* in seconds is provided.
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*/
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void
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ffclock_difftime(ffcounter ffdelta, struct bintime *bt,
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struct bintime *error_bound)
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{
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ffcounter update_ffcount;
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uint32_t err_rate;
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ffclock_convert_diff(ffdelta, bt);
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if (error_bound) {
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do {
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update_ffcount = ffclock_estimate.update_ffcount;
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err_rate = ffclock_estimate.errb_rate;
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} while (update_ffcount != ffclock_estimate.update_ffcount);
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ffclock_convert_diff(ffdelta, error_bound);
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/* 18446744073709 = int(2^64/1e12), err_bound_rate in [ps/s] */
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bintime_mul(error_bound, err_rate * (uint64_t)18446744073709LL);
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}
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}
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/*
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* Sysctl for the Feed-Forward Clock.
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*/
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static int ffclock_version = 2;
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SYSCTL_NODE(_kern, OID_AUTO, ffclock, CTLFLAG_RW, 0,
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"Feed-Forward Clock Support");
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SYSCTL_INT(_kern_ffclock, OID_AUTO, version, CTLFLAG_RD, &ffclock_version, 0,
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"Version of Feed-Forward Clock Support");
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/*
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* Sysctl to select which clock is read when calling any of the
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* [get]{bin,nano,micro}[up]time() functions.
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*/
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char *sysclocks[] = {"feedback", "feed-forward"};
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#define NUM_SYSCLOCKS (sizeof(sysclocks) / sizeof(*sysclocks))
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/* Report or change the active timecounter hardware. */
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static int
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sysctl_kern_ffclock_choice(SYSCTL_HANDLER_ARGS)
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{
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struct sbuf *s;
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int clk, error;
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s = sbuf_new_for_sysctl(NULL, NULL, 16 * NUM_SYSCLOCKS, req);
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if (s == NULL)
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return (ENOMEM);
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for (clk = 0; clk < NUM_SYSCLOCKS; clk++) {
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sbuf_cat(s, sysclocks[clk]);
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if (clk + 1 < NUM_SYSCLOCKS)
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sbuf_cat(s, " ");
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}
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error = sbuf_finish(s);
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sbuf_delete(s);
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return (error);
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}
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SYSCTL_PROC(_kern_ffclock, OID_AUTO, choice, CTLTYPE_STRING | CTLFLAG_RD,
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0, 0, sysctl_kern_ffclock_choice, "A", "Clock paradigms available");
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extern int sysclock_active;
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static int
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sysctl_kern_ffclock_active(SYSCTL_HANDLER_ARGS)
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{
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char newclock[32];
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int error;
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switch (sysclock_active) {
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case SYSCLOCK_FBCK:
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strlcpy(newclock, sysclocks[SYSCLOCK_FBCK], sizeof(newclock));
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break;
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case SYSCLOCK_FFWD:
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strlcpy(newclock, sysclocks[SYSCLOCK_FFWD], sizeof(newclock));
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break;
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}
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error = sysctl_handle_string(oidp, &newclock[0], sizeof(newclock), req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (strncmp(newclock, sysclocks[SYSCLOCK_FBCK],
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sizeof(sysclocks[SYSCLOCK_FBCK])) == 0)
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sysclock_active = SYSCLOCK_FBCK;
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else if (strncmp(newclock, sysclocks[SYSCLOCK_FFWD],
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sizeof(sysclocks[SYSCLOCK_FFWD])) == 0)
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sysclock_active = SYSCLOCK_FFWD;
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else
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return (EINVAL);
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return (error);
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}
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SYSCTL_PROC(_kern_ffclock, OID_AUTO, active, CTLTYPE_STRING | CTLFLAG_RW,
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0, 0, sysctl_kern_ffclock_active, "A", "Kernel clock selected");
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/*
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* High level functions to access the Feed-Forward Clock.
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*/
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void
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ffclock_bintime(struct bintime *bt)
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{
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ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC);
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}
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void
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ffclock_nanotime(struct timespec *tsp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC);
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bintime2timespec(&bt, tsp);
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}
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void
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ffclock_microtime(struct timeval *tvp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC);
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bintime2timeval(&bt, tvp);
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}
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void
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ffclock_getbintime(struct bintime *bt)
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{
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ffclock_abstime(NULL, bt, NULL,
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FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST);
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}
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void
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ffclock_getnanotime(struct timespec *tsp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL,
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FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST);
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bintime2timespec(&bt, tsp);
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}
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void
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ffclock_getmicrotime(struct timeval *tvp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL,
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FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST);
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bintime2timeval(&bt, tvp);
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}
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void
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ffclock_binuptime(struct bintime *bt)
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{
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ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME);
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}
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void
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ffclock_nanouptime(struct timespec *tsp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME);
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bintime2timespec(&bt, tsp);
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}
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void
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ffclock_microuptime(struct timeval *tvp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME);
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bintime2timeval(&bt, tvp);
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}
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void
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ffclock_getbinuptime(struct bintime *bt)
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{
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ffclock_abstime(NULL, bt, NULL,
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FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST);
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}
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void
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ffclock_getnanouptime(struct timespec *tsp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL,
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FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST);
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bintime2timespec(&bt, tsp);
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}
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void
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ffclock_getmicrouptime(struct timeval *tvp)
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{
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struct bintime bt;
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ffclock_abstime(NULL, &bt, NULL,
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FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST);
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bintime2timeval(&bt, tvp);
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}
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void
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ffclock_bindifftime(ffcounter ffdelta, struct bintime *bt)
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{
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ffclock_difftime(ffdelta, bt, NULL);
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}
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void
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ffclock_nanodifftime(ffcounter ffdelta, struct timespec *tsp)
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{
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struct bintime bt;
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ffclock_difftime(ffdelta, &bt, NULL);
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bintime2timespec(&bt, tsp);
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}
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void
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ffclock_microdifftime(ffcounter ffdelta, struct timeval *tvp)
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{
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struct bintime bt;
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ffclock_difftime(ffdelta, &bt, NULL);
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bintime2timeval(&bt, tvp);
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}
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