1 /* 2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * Copyright (c) 1997, 1998 Poul-Henning Kamp <phk@FreeBSD.org> 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * (c) UNIX System Laboratories, Inc. 38 * All or some portions of this file are derived from material licensed 39 * to the University of California by American Telephone and Telegraph 40 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 41 * the permission of UNIX System Laboratories, Inc. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94 72 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $ 73 * $DragonFly: src/sys/kern/kern_clock.c,v 1.29 2004/12/22 11:01:49 joerg Exp $ 74 */ 75 76 #include "opt_ntp.h" 77 78 #include <sys/param.h> 79 #include <sys/systm.h> 80 #include <sys/dkstat.h> 81 #include <sys/callout.h> 82 #include <sys/kernel.h> 83 #include <sys/kinfo.h> 84 #include <sys/proc.h> 85 #include <sys/malloc.h> 86 #include <sys/resourcevar.h> 87 #include <sys/signalvar.h> 88 #include <sys/timex.h> 89 #include <sys/timepps.h> 90 #include <vm/vm.h> 91 #include <sys/lock.h> 92 #include <vm/pmap.h> 93 #include <vm/vm_map.h> 94 #include <sys/sysctl.h> 95 #include <sys/thread2.h> 96 97 #include <machine/cpu.h> 98 #include <machine/limits.h> 99 #include <machine/smp.h> 100 101 #ifdef GPROF 102 #include <sys/gmon.h> 103 #endif 104 105 #ifdef DEVICE_POLLING 106 extern void init_device_poll(void); 107 extern void hardclock_device_poll(void); 108 #endif /* DEVICE_POLLING */ 109 110 static void initclocks (void *dummy); 111 SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL) 112 113 /* 114 * Some of these don't belong here, but it's easiest to concentrate them. 115 * Note that cp_time counts in microseconds, but most userland programs 116 * just compare relative times against the total by delta. 117 */ 118 struct cp_time cp_time; 119 120 SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time), 121 "LU", "CPU time statistics"); 122 123 /* 124 * boottime is used to calculate the 'real' uptime. Do not confuse this with 125 * microuptime(). microtime() is not drift compensated. The real uptime 126 * with compensation is nanotime() - bootime. boottime is recalculated 127 * whenever the real time is set based on the compensated elapsed time 128 * in seconds (gd->gd_time_seconds). 129 * 130 * basetime is used to calculate the compensated real time of day. Chunky 131 * changes to the time, aka settimeofday(), are made by modifying basetime. 132 * 133 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic. 134 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to 135 * the real time. 136 */ 137 struct timespec boottime; /* boot time (realtime) for reference only */ 138 struct timespec basetime; /* base time adjusts uptime -> realtime */ 139 time_t time_second; /* read-only 'passive' uptime in seconds */ 140 141 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD, 142 &boottime, timeval, "System boottime"); 143 SYSCTL_STRUCT(_kern, OID_AUTO, basetime, CTLFLAG_RD, 144 &basetime, timeval, "System basetime"); 145 146 static void hardclock(systimer_t info, struct intrframe *frame); 147 static void statclock(systimer_t info, struct intrframe *frame); 148 static void schedclock(systimer_t info, struct intrframe *frame); 149 150 int ticks; /* system master ticks at hz */ 151 int clocks_running; /* tsleep/timeout clocks operational */ 152 int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */ 153 int64_t nsec_acc; /* accumulator */ 154 155 /* 156 * Finish initializing clock frequencies and start all clocks running. 157 */ 158 /* ARGSUSED*/ 159 static void 160 initclocks(void *dummy) 161 { 162 cpu_initclocks(); 163 #ifdef DEVICE_POLLING 164 init_device_poll(); 165 #endif 166 /*psratio = profhz / stathz;*/ 167 initclocks_pcpu(); 168 clocks_running = 1; 169 } 170 171 /* 172 * Called on a per-cpu basis 173 */ 174 void 175 initclocks_pcpu(void) 176 { 177 struct globaldata *gd = mycpu; 178 179 crit_enter(); 180 if (gd->gd_cpuid == 0) { 181 gd->gd_time_seconds = 1; 182 gd->gd_cpuclock_base = cputimer_count(); 183 } else { 184 /* XXX */ 185 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds; 186 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base; 187 } 188 189 /* 190 * Use a non-queued periodic systimer to prevent multiple ticks from 191 * building up if the sysclock jumps forward (8254 gets reset). The 192 * sysclock will never jump backwards. Our time sync is based on 193 * the actual sysclock, not the ticks count. 194 */ 195 systimer_init_periodic_nq(&gd->gd_hardclock, hardclock, NULL, hz); 196 systimer_init_periodic_nq(&gd->gd_statclock, statclock, NULL, stathz); 197 /* XXX correct the frequency for scheduler / estcpu tests */ 198 systimer_init_periodic_nq(&gd->gd_schedclock, schedclock, 199 NULL, ESTCPUFREQ); 200 crit_exit(); 201 } 202 203 /* 204 * This sets the current real time of day. Timespecs are in seconds and 205 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base, 206 * instead we adjust basetime so basetime + gd_* results in the current 207 * time of day. This way the gd_* fields are guarenteed to represent 208 * a monotonically increasing 'uptime' value. 209 */ 210 void 211 set_timeofday(struct timespec *ts) 212 { 213 struct timespec ts2; 214 215 /* 216 * XXX SMP / non-atomic basetime updates 217 */ 218 crit_enter(); 219 nanouptime(&ts2); 220 basetime.tv_sec = ts->tv_sec - ts2.tv_sec; 221 basetime.tv_nsec = ts->tv_nsec - ts2.tv_nsec; 222 if (basetime.tv_nsec < 0) { 223 basetime.tv_nsec += 1000000000; 224 --basetime.tv_sec; 225 } 226 227 /* 228 * Note that basetime diverges from boottime as the clock drift is 229 * compensated for, so we cannot do away with boottime. When setting 230 * the absolute time of day the drift is 0 (for an instant) and we 231 * can simply assign boottime to basetime. 232 * 233 * Note that nanouptime() is based on gd_time_seconds which is drift 234 * compensated up to a point (it is guarenteed to remain monotonically 235 * increasing). gd_time_seconds is thus our best uptime guess and 236 * suitable for use in the boottime calculation. It is already taken 237 * into account in the basetime calculation above. 238 */ 239 boottime.tv_sec = basetime.tv_sec; 240 timedelta = 0; 241 crit_exit(); 242 } 243 244 /* 245 * Each cpu has its own hardclock, but we only increments ticks and softticks 246 * on cpu #0. 247 * 248 * NOTE! systimer! the MP lock might not be held here. We can only safely 249 * manipulate objects owned by the current cpu. 250 */ 251 static void 252 hardclock(systimer_t info, struct intrframe *frame) 253 { 254 sysclock_t cputicks; 255 struct proc *p; 256 struct pstats *pstats; 257 struct globaldata *gd = mycpu; 258 259 /* 260 * Realtime updates are per-cpu. Note that timer corrections as 261 * returned by microtime() and friends make an additional adjustment 262 * using a system-wise 'basetime', but the running time is always 263 * taken from the per-cpu globaldata area. Since the same clock 264 * is distributing (XXX SMP) to all cpus, the per-cpu timebases 265 * stay in synch. 266 * 267 * Note that we never allow info->time (aka gd->gd_hardclock.time) 268 * to reverse index gd_cpuclock_base, but that it is possible for 269 * it to temporarily get behind in the seconds if something in the 270 * system locks interrupts for a long period of time. Since periodic 271 * timers count events, though everything should resynch again 272 * immediately. 273 */ 274 cputicks = info->time - gd->gd_cpuclock_base; 275 if (cputicks >= cputimer_freq) { 276 ++gd->gd_time_seconds; 277 gd->gd_cpuclock_base += cputimer_freq; 278 } 279 280 /* 281 * The system-wide ticks counter and NTP related timedelta/tickdelta 282 * adjustments only occur on cpu #0. NTP adjustments are accomplished 283 * by updating basetime. 284 */ 285 if (gd->gd_cpuid == 0) { 286 struct timespec nts; 287 int leap; 288 289 ++ticks; 290 291 #ifdef DEVICE_POLLING 292 hardclock_device_poll(); /* mpsafe, short and quick */ 293 #endif /* DEVICE_POLLING */ 294 295 #if 0 296 if (tco->tc_poll_pps) 297 tco->tc_poll_pps(tco); 298 #endif 299 /* 300 * Apply adjtime corrections. At the moment only do this if 301 * we can get the MP lock to interlock with adjtime's modification 302 * of these variables. Note that basetime adjustments are not 303 * MP safe either XXX. 304 */ 305 if (timedelta != 0 && try_mplock()) { 306 basetime.tv_nsec += tickdelta * 1000; 307 if (basetime.tv_nsec >= 1000000000) { 308 basetime.tv_nsec -= 1000000000; 309 ++basetime.tv_sec; 310 } else if (basetime.tv_nsec < 0) { 311 basetime.tv_nsec += 1000000000; 312 --basetime.tv_sec; 313 } 314 timedelta -= tickdelta; 315 rel_mplock(); 316 } 317 318 /* 319 * Apply per-tick compensation. ticks_adj adjusts for both 320 * offset and frequency, and could be negative. 321 */ 322 if (nsec_adj != 0 && try_mplock()) { 323 nsec_acc += nsec_adj; 324 if (nsec_acc >= 0x100000000LL) { 325 basetime.tv_nsec += nsec_acc >> 32; 326 nsec_acc = (nsec_acc & 0xFFFFFFFFLL); 327 } else if (nsec_acc <= -0x100000000LL) { 328 basetime.tv_nsec -= -nsec_acc >> 32; 329 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL); 330 } 331 if (basetime.tv_nsec >= 1000000000) { 332 basetime.tv_nsec -= 1000000000; 333 ++basetime.tv_sec; 334 } else if (basetime.tv_nsec < 0) { 335 basetime.tv_nsec += 1000000000; 336 --basetime.tv_sec; 337 } 338 rel_mplock(); 339 } 340 341 /* 342 * If the realtime-adjusted seconds hand rolls over then tell 343 * ntp_update_second() what we did in the last second so it can 344 * calculate what to do in the next second. It may also add 345 * or subtract a leap second. 346 */ 347 getnanotime(&nts); 348 if (time_second != nts.tv_sec) { 349 leap = ntp_update_second(time_second, &nsec_adj); 350 basetime.tv_sec += leap; 351 time_second = nts.tv_sec + leap; 352 nsec_adj /= hz; 353 } 354 } 355 356 /* 357 * softticks are handled for all cpus 358 */ 359 hardclock_softtick(gd); 360 361 /* 362 * ITimer handling is per-tick, per-cpu. I don't think psignal() 363 * is mpsafe on curproc, so XXX get the mplock. 364 */ 365 if ((p = curproc) != NULL && try_mplock()) { 366 pstats = p->p_stats; 367 if (frame && CLKF_USERMODE(frame) && 368 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) && 369 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0) 370 psignal(p, SIGVTALRM); 371 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) && 372 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0) 373 psignal(p, SIGPROF); 374 rel_mplock(); 375 } 376 setdelayed(); 377 } 378 379 /* 380 * The statistics clock typically runs at a 125Hz rate, and is intended 381 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu. 382 * 383 * NOTE! systimer! the MP lock might not be held here. We can only safely 384 * manipulate objects owned by the current cpu. 385 * 386 * The stats clock is responsible for grabbing a profiling sample. 387 * Most of the statistics are only used by user-level statistics programs. 388 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and 389 * p->p_estcpu. 390 * 391 * Like the other clocks, the stat clock is called from what is effectively 392 * a fast interrupt, so the context should be the thread/process that got 393 * interrupted. 394 */ 395 static void 396 statclock(systimer_t info, struct intrframe *frame) 397 { 398 #ifdef GPROF 399 struct gmonparam *g; 400 int i; 401 #endif 402 thread_t td; 403 struct proc *p; 404 int bump; 405 struct timeval tv; 406 struct timeval *stv; 407 408 /* 409 * How big was our timeslice relative to the last time? 410 */ 411 microuptime(&tv); /* mpsafe */ 412 stv = &mycpu->gd_stattv; 413 if (stv->tv_sec == 0) { 414 bump = 1; 415 } else { 416 bump = tv.tv_usec - stv->tv_usec + 417 (tv.tv_sec - stv->tv_sec) * 1000000; 418 if (bump < 0) 419 bump = 0; 420 if (bump > 1000000) 421 bump = 1000000; 422 } 423 *stv = tv; 424 425 td = curthread; 426 p = td->td_proc; 427 428 if (frame && CLKF_USERMODE(frame)) { 429 /* 430 * Came from userland, handle user time and deal with 431 * possible process. 432 */ 433 if (p && (p->p_flag & P_PROFIL)) 434 addupc_intr(p, CLKF_PC(frame), 1); 435 td->td_uticks += bump; 436 437 /* 438 * Charge the time as appropriate 439 */ 440 if (p && p->p_nice > NZERO) 441 cp_time.cp_nice += bump; 442 else 443 cp_time.cp_user += bump; 444 } else { 445 #ifdef GPROF 446 /* 447 * Kernel statistics are just like addupc_intr, only easier. 448 */ 449 g = &_gmonparam; 450 if (g->state == GMON_PROF_ON && frame) { 451 i = CLKF_PC(frame) - g->lowpc; 452 if (i < g->textsize) { 453 i /= HISTFRACTION * sizeof(*g->kcount); 454 g->kcount[i]++; 455 } 456 } 457 #endif 458 /* 459 * Came from kernel mode, so we were: 460 * - handling an interrupt, 461 * - doing syscall or trap work on behalf of the current 462 * user process, or 463 * - spinning in the idle loop. 464 * Whichever it is, charge the time as appropriate. 465 * Note that we charge interrupts to the current process, 466 * regardless of whether they are ``for'' that process, 467 * so that we know how much of its real time was spent 468 * in ``non-process'' (i.e., interrupt) work. 469 * 470 * XXX assume system if frame is NULL. A NULL frame 471 * can occur if ipi processing is done from an splx(). 472 */ 473 if (frame && CLKF_INTR(frame)) 474 td->td_iticks += bump; 475 else 476 td->td_sticks += bump; 477 478 if (frame && CLKF_INTR(frame)) { 479 cp_time.cp_intr += bump; 480 } else { 481 if (td == &mycpu->gd_idlethread) 482 cp_time.cp_idle += bump; 483 else 484 cp_time.cp_sys += bump; 485 } 486 } 487 } 488 489 /* 490 * The scheduler clock typically runs at a 20Hz rate. NOTE! systimer, 491 * the MP lock might not be held. We can safely manipulate parts of curproc 492 * but that's about it. 493 */ 494 static void 495 schedclock(systimer_t info, struct intrframe *frame) 496 { 497 struct proc *p; 498 struct pstats *pstats; 499 struct rusage *ru; 500 struct vmspace *vm; 501 long rss; 502 503 schedulerclock(NULL); /* mpsafe */ 504 if ((p = curproc) != NULL) { 505 /* Update resource usage integrals and maximums. */ 506 if ((pstats = p->p_stats) != NULL && 507 (ru = &pstats->p_ru) != NULL && 508 (vm = p->p_vmspace) != NULL) { 509 ru->ru_ixrss += pgtok(vm->vm_tsize); 510 ru->ru_idrss += pgtok(vm->vm_dsize); 511 ru->ru_isrss += pgtok(vm->vm_ssize); 512 rss = pgtok(vmspace_resident_count(vm)); 513 if (ru->ru_maxrss < rss) 514 ru->ru_maxrss = rss; 515 } 516 } 517 } 518 519 /* 520 * Compute number of ticks for the specified amount of time. The 521 * return value is intended to be used in a clock interrupt timed 522 * operation and guarenteed to meet or exceed the requested time. 523 * If the representation overflows, return INT_MAX. The minimum return 524 * value is 1 ticks and the function will average the calculation up. 525 * If any value greater then 0 microseconds is supplied, a value 526 * of at least 2 will be returned to ensure that a near-term clock 527 * interrupt does not cause the timeout to occur (degenerately) early. 528 * 529 * Note that limit checks must take into account microseconds, which is 530 * done simply by using the smaller signed long maximum instead of 531 * the unsigned long maximum. 532 * 533 * If ints have 32 bits, then the maximum value for any timeout in 534 * 10ms ticks is 248 days. 535 */ 536 int 537 tvtohz_high(struct timeval *tv) 538 { 539 int ticks; 540 long sec, usec; 541 542 sec = tv->tv_sec; 543 usec = tv->tv_usec; 544 if (usec < 0) { 545 sec--; 546 usec += 1000000; 547 } 548 if (sec < 0) { 549 #ifdef DIAGNOSTIC 550 if (usec > 0) { 551 sec++; 552 usec -= 1000000; 553 } 554 printf("tvotohz: negative time difference %ld sec %ld usec\n", 555 sec, usec); 556 #endif 557 ticks = 1; 558 } else if (sec <= INT_MAX / hz) { 559 ticks = (int)(sec * hz + 560 ((u_long)usec + (tick - 1)) / tick) + 1; 561 } else { 562 ticks = INT_MAX; 563 } 564 return (ticks); 565 } 566 567 /* 568 * Compute number of ticks for the specified amount of time, erroring on 569 * the side of it being too low to ensure that sleeping the returned number 570 * of ticks will not result in a late return. 571 * 572 * The supplied timeval may not be negative and should be normalized. A 573 * return value of 0 is possible if the timeval converts to less then 574 * 1 tick. 575 * 576 * If ints have 32 bits, then the maximum value for any timeout in 577 * 10ms ticks is 248 days. 578 */ 579 int 580 tvtohz_low(struct timeval *tv) 581 { 582 int ticks; 583 long sec; 584 585 sec = tv->tv_sec; 586 if (sec <= INT_MAX / hz) 587 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick); 588 else 589 ticks = INT_MAX; 590 return (ticks); 591 } 592 593 594 /* 595 * Start profiling on a process. 596 * 597 * Kernel profiling passes proc0 which never exits and hence 598 * keeps the profile clock running constantly. 599 */ 600 void 601 startprofclock(struct proc *p) 602 { 603 if ((p->p_flag & P_PROFIL) == 0) { 604 p->p_flag |= P_PROFIL; 605 #if 0 /* XXX */ 606 if (++profprocs == 1 && stathz != 0) { 607 s = splstatclock(); 608 psdiv = psratio; 609 setstatclockrate(profhz); 610 splx(s); 611 } 612 #endif 613 } 614 } 615 616 /* 617 * Stop profiling on a process. 618 */ 619 void 620 stopprofclock(struct proc *p) 621 { 622 if (p->p_flag & P_PROFIL) { 623 p->p_flag &= ~P_PROFIL; 624 #if 0 /* XXX */ 625 if (--profprocs == 0 && stathz != 0) { 626 s = splstatclock(); 627 psdiv = 1; 628 setstatclockrate(stathz); 629 splx(s); 630 } 631 #endif 632 } 633 } 634 635 /* 636 * Return information about system clocks. 637 */ 638 static int 639 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS) 640 { 641 struct kinfo_clockinfo clkinfo; 642 /* 643 * Construct clockinfo structure. 644 */ 645 clkinfo.ci_hz = hz; 646 clkinfo.ci_tick = tick; 647 clkinfo.ci_tickadj = tickadj; 648 clkinfo.ci_profhz = profhz; 649 clkinfo.ci_stathz = stathz ? stathz : hz; 650 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req)); 651 } 652 653 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD, 654 0, 0, sysctl_kern_clockrate, "S,clockinfo",""); 655 656 /* 657 * We have eight functions for looking at the clock, four for 658 * microseconds and four for nanoseconds. For each there is fast 659 * but less precise version "get{nano|micro}[up]time" which will 660 * return a time which is up to 1/HZ previous to the call, whereas 661 * the raw version "{nano|micro}[up]time" will return a timestamp 662 * which is as precise as possible. The "up" variants return the 663 * time relative to system boot, these are well suited for time 664 * interval measurements. 665 * 666 * Each cpu independantly maintains the current time of day, so all 667 * we need to do to protect ourselves from changes is to do a loop 668 * check on the seconds field changing out from under us. 669 * 670 * The system timer maintains a 32 bit count and due to various issues 671 * it is possible for the calculated delta to occassionally exceed 672 * cputimer_freq. If this occurs the cputimer_freq64_nsec multiplication 673 * can easily overflow, so we deal with the case. For uniformity we deal 674 * with the case in the usec case too. 675 */ 676 void 677 getmicrouptime(struct timeval *tvp) 678 { 679 struct globaldata *gd = mycpu; 680 sysclock_t delta; 681 682 do { 683 tvp->tv_sec = gd->gd_time_seconds; 684 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 685 } while (tvp->tv_sec != gd->gd_time_seconds); 686 687 if (delta >= cputimer_freq) { 688 tvp->tv_sec += delta / cputimer_freq; 689 delta %= cputimer_freq; 690 } 691 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32; 692 if (tvp->tv_usec >= 1000000) { 693 tvp->tv_usec -= 1000000; 694 ++tvp->tv_sec; 695 } 696 } 697 698 void 699 getnanouptime(struct timespec *tsp) 700 { 701 struct globaldata *gd = mycpu; 702 sysclock_t delta; 703 704 do { 705 tsp->tv_sec = gd->gd_time_seconds; 706 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 707 } while (tsp->tv_sec != gd->gd_time_seconds); 708 709 if (delta >= cputimer_freq) { 710 tsp->tv_sec += delta / cputimer_freq; 711 delta %= cputimer_freq; 712 } 713 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32; 714 } 715 716 void 717 microuptime(struct timeval *tvp) 718 { 719 struct globaldata *gd = mycpu; 720 sysclock_t delta; 721 722 do { 723 tvp->tv_sec = gd->gd_time_seconds; 724 delta = cputimer_count() - gd->gd_cpuclock_base; 725 } while (tvp->tv_sec != gd->gd_time_seconds); 726 727 if (delta >= cputimer_freq) { 728 tvp->tv_sec += delta / cputimer_freq; 729 delta %= cputimer_freq; 730 } 731 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32; 732 } 733 734 void 735 nanouptime(struct timespec *tsp) 736 { 737 struct globaldata *gd = mycpu; 738 sysclock_t delta; 739 740 do { 741 tsp->tv_sec = gd->gd_time_seconds; 742 delta = cputimer_count() - gd->gd_cpuclock_base; 743 } while (tsp->tv_sec != gd->gd_time_seconds); 744 745 if (delta >= cputimer_freq) { 746 tsp->tv_sec += delta / cputimer_freq; 747 delta %= cputimer_freq; 748 } 749 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32; 750 } 751 752 /* 753 * realtime routines 754 */ 755 756 void 757 getmicrotime(struct timeval *tvp) 758 { 759 struct globaldata *gd = mycpu; 760 sysclock_t delta; 761 762 do { 763 tvp->tv_sec = gd->gd_time_seconds; 764 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 765 } while (tvp->tv_sec != gd->gd_time_seconds); 766 767 if (delta >= cputimer_freq) { 768 tvp->tv_sec += delta / cputimer_freq; 769 delta %= cputimer_freq; 770 } 771 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32; 772 773 tvp->tv_sec += basetime.tv_sec; 774 tvp->tv_usec += basetime.tv_nsec / 1000; 775 while (tvp->tv_usec >= 1000000) { 776 tvp->tv_usec -= 1000000; 777 ++tvp->tv_sec; 778 } 779 } 780 781 void 782 getnanotime(struct timespec *tsp) 783 { 784 struct globaldata *gd = mycpu; 785 sysclock_t delta; 786 787 do { 788 tsp->tv_sec = gd->gd_time_seconds; 789 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 790 } while (tsp->tv_sec != gd->gd_time_seconds); 791 792 if (delta >= cputimer_freq) { 793 tsp->tv_sec += delta / cputimer_freq; 794 delta %= cputimer_freq; 795 } 796 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32; 797 798 tsp->tv_sec += basetime.tv_sec; 799 tsp->tv_nsec += basetime.tv_nsec; 800 while (tsp->tv_nsec >= 1000000000) { 801 tsp->tv_nsec -= 1000000000; 802 ++tsp->tv_sec; 803 } 804 } 805 806 void 807 microtime(struct timeval *tvp) 808 { 809 struct globaldata *gd = mycpu; 810 sysclock_t delta; 811 812 do { 813 tvp->tv_sec = gd->gd_time_seconds; 814 delta = cputimer_count() - gd->gd_cpuclock_base; 815 } while (tvp->tv_sec != gd->gd_time_seconds); 816 817 if (delta >= cputimer_freq) { 818 tvp->tv_sec += delta / cputimer_freq; 819 delta %= cputimer_freq; 820 } 821 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32; 822 823 tvp->tv_sec += basetime.tv_sec; 824 tvp->tv_usec += basetime.tv_nsec / 1000; 825 while (tvp->tv_usec >= 1000000) { 826 tvp->tv_usec -= 1000000; 827 ++tvp->tv_sec; 828 } 829 } 830 831 void 832 nanotime(struct timespec *tsp) 833 { 834 struct globaldata *gd = mycpu; 835 sysclock_t delta; 836 837 do { 838 tsp->tv_sec = gd->gd_time_seconds; 839 delta = cputimer_count() - gd->gd_cpuclock_base; 840 } while (tsp->tv_sec != gd->gd_time_seconds); 841 842 if (delta >= cputimer_freq) { 843 tsp->tv_sec += delta / cputimer_freq; 844 delta %= cputimer_freq; 845 } 846 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32; 847 848 tsp->tv_sec += basetime.tv_sec; 849 tsp->tv_nsec += basetime.tv_nsec; 850 while (tsp->tv_nsec >= 1000000000) { 851 tsp->tv_nsec -= 1000000000; 852 ++tsp->tv_sec; 853 } 854 } 855 856 int 857 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps) 858 { 859 pps_params_t *app; 860 struct pps_fetch_args *fapi; 861 #ifdef PPS_SYNC 862 struct pps_kcbind_args *kapi; 863 #endif 864 865 switch (cmd) { 866 case PPS_IOC_CREATE: 867 return (0); 868 case PPS_IOC_DESTROY: 869 return (0); 870 case PPS_IOC_SETPARAMS: 871 app = (pps_params_t *)data; 872 if (app->mode & ~pps->ppscap) 873 return (EINVAL); 874 pps->ppsparam = *app; 875 return (0); 876 case PPS_IOC_GETPARAMS: 877 app = (pps_params_t *)data; 878 *app = pps->ppsparam; 879 app->api_version = PPS_API_VERS_1; 880 return (0); 881 case PPS_IOC_GETCAP: 882 *(int*)data = pps->ppscap; 883 return (0); 884 case PPS_IOC_FETCH: 885 fapi = (struct pps_fetch_args *)data; 886 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC) 887 return (EINVAL); 888 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec) 889 return (EOPNOTSUPP); 890 pps->ppsinfo.current_mode = pps->ppsparam.mode; 891 fapi->pps_info_buf = pps->ppsinfo; 892 return (0); 893 case PPS_IOC_KCBIND: 894 #ifdef PPS_SYNC 895 kapi = (struct pps_kcbind_args *)data; 896 /* XXX Only root should be able to do this */ 897 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC) 898 return (EINVAL); 899 if (kapi->kernel_consumer != PPS_KC_HARDPPS) 900 return (EINVAL); 901 if (kapi->edge & ~pps->ppscap) 902 return (EINVAL); 903 pps->kcmode = kapi->edge; 904 return (0); 905 #else 906 return (EOPNOTSUPP); 907 #endif 908 default: 909 return (ENOTTY); 910 } 911 } 912 913 void 914 pps_init(struct pps_state *pps) 915 { 916 pps->ppscap |= PPS_TSFMT_TSPEC; 917 if (pps->ppscap & PPS_CAPTUREASSERT) 918 pps->ppscap |= PPS_OFFSETASSERT; 919 if (pps->ppscap & PPS_CAPTURECLEAR) 920 pps->ppscap |= PPS_OFFSETCLEAR; 921 } 922 923 void 924 pps_event(struct pps_state *pps, sysclock_t count, int event) 925 { 926 struct globaldata *gd; 927 struct timespec *tsp; 928 struct timespec *osp; 929 struct timespec ts; 930 sysclock_t *pcount; 931 #ifdef PPS_SYNC 932 sysclock_t tcount; 933 #endif 934 sysclock_t delta; 935 pps_seq_t *pseq; 936 int foff; 937 int fhard; 938 939 gd = mycpu; 940 941 /* Things would be easier with arrays... */ 942 if (event == PPS_CAPTUREASSERT) { 943 tsp = &pps->ppsinfo.assert_timestamp; 944 osp = &pps->ppsparam.assert_offset; 945 foff = pps->ppsparam.mode & PPS_OFFSETASSERT; 946 fhard = pps->kcmode & PPS_CAPTUREASSERT; 947 pcount = &pps->ppscount[0]; 948 pseq = &pps->ppsinfo.assert_sequence; 949 } else { 950 tsp = &pps->ppsinfo.clear_timestamp; 951 osp = &pps->ppsparam.clear_offset; 952 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR; 953 fhard = pps->kcmode & PPS_CAPTURECLEAR; 954 pcount = &pps->ppscount[1]; 955 pseq = &pps->ppsinfo.clear_sequence; 956 } 957 958 /* Nothing really happened */ 959 if (*pcount == count) 960 return; 961 962 *pcount = count; 963 964 do { 965 ts.tv_sec = gd->gd_time_seconds; 966 delta = count - gd->gd_cpuclock_base; 967 } while (ts.tv_sec != gd->gd_time_seconds); 968 969 if (delta >= cputimer_freq) { 970 ts.tv_sec += delta / cputimer_freq; 971 delta %= cputimer_freq; 972 } 973 ts.tv_nsec = (cputimer_freq64_nsec * delta) >> 32; 974 ts.tv_sec += basetime.tv_sec; 975 ts.tv_nsec += basetime.tv_nsec; 976 while (ts.tv_nsec >= 1000000000) { 977 ts.tv_nsec -= 1000000000; 978 ++ts.tv_sec; 979 } 980 981 (*pseq)++; 982 *tsp = ts; 983 984 if (foff) { 985 timespecadd(tsp, osp); 986 if (tsp->tv_nsec < 0) { 987 tsp->tv_nsec += 1000000000; 988 tsp->tv_sec -= 1; 989 } 990 } 991 #ifdef PPS_SYNC 992 if (fhard) { 993 /* magic, at its best... */ 994 tcount = count - pps->ppscount[2]; 995 pps->ppscount[2] = count; 996 if (tcount >= cputimer_freq) { 997 delta = 1000000000 * (tcount / cputimer_freq) + 998 (cputimer_freq64_nsec * 999 (tcount % cputimer_freq)) >> 32; 1000 } else { 1001 delta = (cputimer_freq64_nsec * tcount) >> 32; 1002 } 1003 hardpps(tsp, delta); 1004 } 1005 #endif 1006 } 1007 1008