1 /*- 2 * Copyright (c) 1997, 1998 Poul-Henning Kamp <phk@FreeBSD.org> 3 * Copyright (c) 1982, 1986, 1991, 1993 4 * The Regents of the University of California. All rights reserved. 5 * (c) UNIX System Laboratories, Inc. 6 * All or some portions of this file are derived from material licensed 7 * to the University of California by American Telephone and Telegraph 8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9 * the permission of UNIX System Laboratories, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94 40 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $ 41 * $DragonFly: src/sys/kern/kern_clock.c,v 1.14 2004/01/07 20:21:46 dillon Exp $ 42 */ 43 44 #include "opt_ntp.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/dkstat.h> 49 #include <sys/callout.h> 50 #include <sys/kernel.h> 51 #include <sys/proc.h> 52 #include <sys/malloc.h> 53 #include <sys/resourcevar.h> 54 #include <sys/signalvar.h> 55 #include <sys/timex.h> 56 #include <sys/timepps.h> 57 #include <vm/vm.h> 58 #include <sys/lock.h> 59 #include <vm/pmap.h> 60 #include <vm/vm_map.h> 61 #include <sys/sysctl.h> 62 #include <sys/thread2.h> 63 64 #include <machine/cpu.h> 65 #include <machine/limits.h> 66 #include <machine/smp.h> 67 68 #ifdef GPROF 69 #include <sys/gmon.h> 70 #endif 71 72 #ifdef DEVICE_POLLING 73 extern void init_device_poll(void); 74 extern void hardclock_device_poll(void); 75 #endif /* DEVICE_POLLING */ 76 77 /* 78 * Number of timecounters used to implement stable storage 79 */ 80 #ifndef NTIMECOUNTER 81 #define NTIMECOUNTER 5 82 #endif 83 84 static MALLOC_DEFINE(M_TIMECOUNTER, "timecounter", 85 "Timecounter stable storage"); 86 87 static void initclocks (void *dummy); 88 SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL) 89 90 static void tco_forward (int force); 91 static void tco_setscales (struct timecounter *tc); 92 static __inline unsigned tco_delta (struct timecounter *tc); 93 94 /* 95 * Some of these don't belong here, but it's easiest to concentrate them. 96 * Note that cp_time[] counts in microseconds, but most userland programs 97 * just compare relative times against the total by delta. 98 */ 99 long cp_time[CPUSTATES]; 100 101 SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time), 102 "LU", "CPU time statistics"); 103 104 long tk_cancc; 105 long tk_nin; 106 long tk_nout; 107 long tk_rawcc; 108 109 time_t time_second; 110 111 struct timeval boottime; 112 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD, 113 &boottime, timeval, "System boottime"); 114 115 /* 116 * Which update policy to use. 117 * 0 - every tick, bad hardware may fail with "calcru negative..." 118 * 1 - more resistent to the above hardware, but less efficient. 119 */ 120 static int tco_method; 121 122 /* 123 * Implement a dummy timecounter which we can use until we get a real one 124 * in the air. This allows the console and other early stuff to use 125 * timeservices. 126 */ 127 128 static unsigned 129 dummy_get_timecount(struct timecounter *tc) 130 { 131 static unsigned now; 132 return (++now); 133 } 134 135 static struct timecounter dummy_timecounter = { 136 dummy_get_timecount, 137 0, 138 ~0u, 139 1000000, 140 "dummy" 141 }; 142 143 struct timecounter *timecounter = &dummy_timecounter; 144 145 /* 146 * Clock handling routines. 147 * 148 * This code is written to operate with two timers that run independently of 149 * each other. 150 * 151 * The main timer, running hz times per second, is used to trigger interval 152 * timers, timeouts and rescheduling as needed. 153 * 154 * The second timer handles kernel and user profiling, 155 * and does resource use estimation. If the second timer is programmable, 156 * it is randomized to avoid aliasing between the two clocks. For example, 157 * the randomization prevents an adversary from always giving up the cpu 158 * just before its quantum expires. Otherwise, it would never accumulate 159 * cpu ticks. The mean frequency of the second timer is stathz. 160 * 161 * If no second timer exists, stathz will be zero; in this case we drive 162 * profiling and statistics off the main clock. This WILL NOT be accurate; 163 * do not do it unless absolutely necessary. 164 * 165 * The statistics clock may (or may not) be run at a higher rate while 166 * profiling. This profile clock runs at profhz. We require that profhz 167 * be an integral multiple of stathz. 168 * 169 * If the statistics clock is running fast, it must be divided by the ratio 170 * profhz/stathz for statistics. (For profiling, every tick counts.) 171 * 172 * Time-of-day is maintained using a "timecounter", which may or may 173 * not be related to the hardware generating the above mentioned 174 * interrupts. 175 */ 176 177 int stathz; 178 int profhz; 179 static int profprocs; 180 int ticks; 181 static int psticks; /* profiler ticks */ 182 static int psdiv; /* prof / stat divider */ 183 int psratio; /* ratio: prof * 100 / stat */ 184 185 /* 186 * Initialize clock frequencies and start both clocks running. 187 */ 188 /* ARGSUSED*/ 189 static void 190 initclocks(dummy) 191 void *dummy; 192 { 193 int i; 194 195 /* 196 * Set divisors to 1 (normal case) and let the machine-specific 197 * code do its bit. 198 */ 199 psdiv = 1; 200 cpu_initclocks(); 201 202 #ifdef DEVICE_POLLING 203 init_device_poll(); 204 #endif 205 206 /* 207 * Compute profhz/stathz, and fix profhz if needed. 208 */ 209 i = stathz ? stathz : hz; 210 if (profhz == 0) 211 profhz = i; 212 psratio = profhz / i; 213 } 214 215 /* 216 * The real-time timer, interrupting hz times per second. This is implemented 217 * as a FAST interrupt so it is in the context of the thread it interrupted, 218 * and not in an interrupt thread. YYY needs help. 219 */ 220 void 221 hardclock(frame) 222 struct clockframe *frame; 223 { 224 struct proc *p; 225 226 p = curproc; 227 if (p) { 228 struct pstats *pstats; 229 230 /* 231 * Run current process's virtual and profile time, as needed. 232 */ 233 pstats = p->p_stats; 234 if (CLKF_USERMODE(frame) && 235 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) && 236 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0) 237 psignal(p, SIGVTALRM); 238 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) && 239 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0) 240 psignal(p, SIGPROF); 241 } 242 243 #if 0 /* SMP and BETTER_CLOCK */ 244 forward_hardclock(pscnt); 245 #endif 246 247 /* 248 * If no separate statistics clock is available, run it from here. 249 */ 250 if (stathz == 0) 251 statclock(frame); 252 253 tco_forward(0); 254 ticks++; 255 256 #ifdef DEVICE_POLLING 257 hardclock_device_poll(); /* this is very short and quick */ 258 #endif /* DEVICE_POLLING */ 259 260 /* 261 * Process callouts at a very low cpu priority, so we don't keep the 262 * relatively high clock interrupt priority any longer than necessary. 263 */ 264 if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) { 265 setsoftclock(); 266 } else if (softticks + 1 == ticks) { 267 ++softticks; 268 } 269 } 270 271 /* 272 * Compute number of ticks for the specified amount of time. The 273 * return value is intended to be used in a clock interrupt timed 274 * operation and guarenteed to meet or exceed the requested time. 275 * If the representation overflows, return INT_MAX. The minimum return 276 * value is 1 ticks and the function will average the calculation up. 277 * If any value greater then 0 microseconds is supplied, a value 278 * of at least 2 will be returned to ensure that a near-term clock 279 * interrupt does not cause the timeout to occur (degenerately) early. 280 * 281 * Note that limit checks must take into account microseconds, which is 282 * done simply by using the smaller signed long maximum instead of 283 * the unsigned long maximum. 284 * 285 * If ints have 32 bits, then the maximum value for any timeout in 286 * 10ms ticks is 248 days. 287 */ 288 int 289 tvtohz_high(struct timeval *tv) 290 { 291 int ticks; 292 long sec, usec; 293 294 sec = tv->tv_sec; 295 usec = tv->tv_usec; 296 if (usec < 0) { 297 sec--; 298 usec += 1000000; 299 } 300 if (sec < 0) { 301 #ifdef DIAGNOSTIC 302 if (usec > 0) { 303 sec++; 304 usec -= 1000000; 305 } 306 printf("tvotohz: negative time difference %ld sec %ld usec\n", 307 sec, usec); 308 #endif 309 ticks = 1; 310 } else if (sec <= INT_MAX / hz) { 311 ticks = (int)(sec * hz + 312 ((u_long)usec + (tick - 1)) / tick) + 1; 313 } else { 314 ticks = INT_MAX; 315 } 316 return (ticks); 317 } 318 319 /* 320 * Compute number of ticks for the specified amount of time, erroring on 321 * the side of it being too low to ensure that sleeping the returned number 322 * of ticks will not result in a late return. 323 * 324 * The supplied timeval may not be negative and should be normalized. A 325 * return value of 0 is possible if the timeval converts to less then 326 * 1 tick. 327 * 328 * If ints have 32 bits, then the maximum value for any timeout in 329 * 10ms ticks is 248 days. 330 */ 331 int 332 tvtohz_low(struct timeval *tv) 333 { 334 int ticks; 335 long sec; 336 337 sec = tv->tv_sec; 338 if (sec <= INT_MAX / hz) 339 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick); 340 else 341 ticks = INT_MAX; 342 return (ticks); 343 } 344 345 346 /* 347 * Start profiling on a process. 348 * 349 * Kernel profiling passes proc0 which never exits and hence 350 * keeps the profile clock running constantly. 351 */ 352 void 353 startprofclock(p) 354 struct proc *p; 355 { 356 int s; 357 358 if ((p->p_flag & P_PROFIL) == 0) { 359 p->p_flag |= P_PROFIL; 360 if (++profprocs == 1 && stathz != 0) { 361 s = splstatclock(); 362 psdiv = psratio; 363 setstatclockrate(profhz); 364 splx(s); 365 } 366 } 367 } 368 369 /* 370 * Stop profiling on a process. 371 */ 372 void 373 stopprofclock(p) 374 struct proc *p; 375 { 376 int s; 377 378 if (p->p_flag & P_PROFIL) { 379 p->p_flag &= ~P_PROFIL; 380 if (--profprocs == 0 && stathz != 0) { 381 s = splstatclock(); 382 psdiv = 1; 383 setstatclockrate(stathz); 384 splx(s); 385 } 386 } 387 } 388 389 /* 390 * Statistics clock. Grab profile sample, and if divider reaches 0, 391 * do process and kernel statistics. Most of the statistics are only 392 * used by user-level statistics programs. The main exceptions are 393 * p->p_uticks, p->p_sticks, p->p_iticks, and p->p_estcpu. 394 * 395 * The statclock should be called from an exclusive, fast interrupt, 396 * so the context should be the thread/process that got interrupted and 397 * not an interrupt thread. 398 */ 399 void 400 statclock(frame) 401 struct clockframe *frame; 402 { 403 #ifdef GPROF 404 struct gmonparam *g; 405 int i; 406 #endif 407 thread_t td; 408 struct pstats *pstats; 409 long rss; 410 struct rusage *ru; 411 struct vmspace *vm; 412 struct proc *p; 413 int bump; 414 struct timeval tv; 415 struct timeval *stv; 416 417 /* 418 * How big was our timeslice relative to the last time 419 */ 420 microuptime(&tv); 421 stv = &mycpu->gd_stattv; 422 if (stv->tv_sec == 0) { 423 bump = 1; 424 } else { 425 bump = tv.tv_usec - stv->tv_usec + 426 (tv.tv_sec - stv->tv_sec) * 1000000; 427 if (bump < 0) 428 bump = 0; 429 if (bump > 1000000) 430 bump = 1000000; 431 } 432 *stv = tv; 433 434 td = curthread; 435 p = td->td_proc; 436 437 if (CLKF_USERMODE(frame)) { 438 /* 439 * Came from userland, handle user time and deal with 440 * possible process. 441 */ 442 if (p && (p->p_flag & P_PROFIL)) 443 addupc_intr(p, CLKF_PC(frame), 1); 444 #if 0 /* SMP and BETTER_CLOCK */ 445 if (stathz != 0) 446 forward_statclock(pscnt); 447 #endif 448 td->td_uticks += bump; 449 450 /* 451 * Charge the time as appropriate 452 */ 453 if (p && p->p_nice > NZERO) 454 cp_time[CP_NICE] += bump; 455 else 456 cp_time[CP_USER] += bump; 457 } else { 458 #ifdef GPROF 459 /* 460 * Kernel statistics are just like addupc_intr, only easier. 461 */ 462 g = &_gmonparam; 463 if (g->state == GMON_PROF_ON) { 464 i = CLKF_PC(frame) - g->lowpc; 465 if (i < g->textsize) { 466 i /= HISTFRACTION * sizeof(*g->kcount); 467 g->kcount[i]++; 468 } 469 } 470 #endif 471 #if 0 /* SMP and BETTER_CLOCK */ 472 if (stathz != 0) 473 forward_statclock(pscnt); 474 #endif 475 /* 476 * Came from kernel mode, so we were: 477 * - handling an interrupt, 478 * - doing syscall or trap work on behalf of the current 479 * user process, or 480 * - spinning in the idle loop. 481 * Whichever it is, charge the time as appropriate. 482 * Note that we charge interrupts to the current process, 483 * regardless of whether they are ``for'' that process, 484 * so that we know how much of its real time was spent 485 * in ``non-process'' (i.e., interrupt) work. 486 */ 487 if (CLKF_INTR(frame)) 488 td->td_iticks += bump; 489 else 490 td->td_sticks += bump; 491 492 if (CLKF_INTR(frame)) { 493 cp_time[CP_INTR] += bump; 494 } else { 495 if (td == &mycpu->gd_idlethread) 496 cp_time[CP_IDLE] += bump; 497 else 498 cp_time[CP_SYS] += bump; 499 } 500 } 501 502 /* 503 * bump psticks and check against gd_psticks. When we hit the 504 * 1*hz mark (psdiv ticks) we do the more expensive stuff. If 505 * psdiv changes we reset everything to avoid confusion. 506 */ 507 ++psticks; 508 if (psticks < mycpu->gd_psticks && psdiv == mycpu->gd_psdiv) 509 return; 510 511 mycpu->gd_psdiv = psdiv; 512 mycpu->gd_psticks = psticks + psdiv; 513 514 /* 515 * XXX YYY DragonFly... need to rewrite all of this, 516 * only schedclock is distributed at the moment 517 */ 518 schedclock(NULL); 519 #ifdef SMP 520 if (smp_started && invltlb_ok && !cold && !panicstr) /* YYY */ 521 lwkt_send_ipiq_mask(mycpu->gd_other_cpus, schedclock, NULL); 522 #endif 523 524 if (p != NULL) { 525 /* Update resource usage integrals and maximums. */ 526 if ((pstats = p->p_stats) != NULL && 527 (ru = &pstats->p_ru) != NULL && 528 (vm = p->p_vmspace) != NULL) { 529 ru->ru_ixrss += pgtok(vm->vm_tsize); 530 ru->ru_idrss += pgtok(vm->vm_dsize); 531 ru->ru_isrss += pgtok(vm->vm_ssize); 532 rss = pgtok(vmspace_resident_count(vm)); 533 if (ru->ru_maxrss < rss) 534 ru->ru_maxrss = rss; 535 } 536 } 537 } 538 539 /* 540 * Return information about system clocks. 541 */ 542 static int 543 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS) 544 { 545 struct clockinfo clkinfo; 546 /* 547 * Construct clockinfo structure. 548 */ 549 clkinfo.hz = hz; 550 clkinfo.tick = tick; 551 clkinfo.tickadj = tickadj; 552 clkinfo.profhz = profhz; 553 clkinfo.stathz = stathz ? stathz : hz; 554 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req)); 555 } 556 557 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD, 558 0, 0, sysctl_kern_clockrate, "S,clockinfo",""); 559 560 static __inline unsigned 561 tco_delta(struct timecounter *tc) 562 { 563 564 return ((tc->tc_get_timecount(tc) - tc->tc_offset_count) & 565 tc->tc_counter_mask); 566 } 567 568 /* 569 * We have eight functions for looking at the clock, four for 570 * microseconds and four for nanoseconds. For each there is fast 571 * but less precise version "get{nano|micro}[up]time" which will 572 * return a time which is up to 1/HZ previous to the call, whereas 573 * the raw version "{nano|micro}[up]time" will return a timestamp 574 * which is as precise as possible. The "up" variants return the 575 * time relative to system boot, these are well suited for time 576 * interval measurements. 577 */ 578 579 void 580 getmicrotime(struct timeval *tvp) 581 { 582 struct timecounter *tc; 583 584 if (!tco_method) { 585 tc = timecounter; 586 *tvp = tc->tc_microtime; 587 } else { 588 microtime(tvp); 589 } 590 } 591 592 void 593 getnanotime(struct timespec *tsp) 594 { 595 struct timecounter *tc; 596 597 if (!tco_method) { 598 tc = timecounter; 599 *tsp = tc->tc_nanotime; 600 } else { 601 nanotime(tsp); 602 } 603 } 604 605 void 606 microtime(struct timeval *tv) 607 { 608 struct timecounter *tc; 609 int delta; 610 611 tc = timecounter; 612 crit_enter(); 613 delta = tco_delta(tc); 614 tv->tv_sec = tc->tc_offset_sec; 615 tv->tv_usec = tc->tc_offset_micro; 616 tv->tv_usec += ((u_int64_t)delta * tc->tc_scale_micro) >> 32; 617 crit_exit(); 618 tv->tv_usec += boottime.tv_usec; 619 tv->tv_sec += boottime.tv_sec; 620 while (tv->tv_usec < 0) { 621 tv->tv_usec += 1000000; 622 if (tv->tv_sec > 0) 623 tv->tv_sec--; 624 } 625 while (tv->tv_usec >= 1000000) { 626 tv->tv_usec -= 1000000; 627 tv->tv_sec++; 628 } 629 } 630 631 void 632 nanotime(struct timespec *ts) 633 { 634 unsigned count; 635 u_int64_t delta; 636 struct timecounter *tc; 637 638 tc = timecounter; 639 crit_enter(); 640 ts->tv_sec = tc->tc_offset_sec; 641 count = tco_delta(tc); 642 delta = tc->tc_offset_nano; 643 crit_exit(); 644 delta += ((u_int64_t)count * tc->tc_scale_nano_f); 645 delta >>= 32; 646 delta += ((u_int64_t)count * tc->tc_scale_nano_i); 647 delta += boottime.tv_usec * 1000; 648 ts->tv_sec += boottime.tv_sec; 649 while (delta < 0) { 650 delta += 1000000000; 651 if (ts->tv_sec > 0) 652 ts->tv_sec--; 653 } 654 while (delta >= 1000000000) { 655 delta -= 1000000000; 656 ts->tv_sec++; 657 } 658 ts->tv_nsec = delta; 659 } 660 661 void 662 getmicrouptime(struct timeval *tvp) 663 { 664 struct timecounter *tc; 665 666 if (!tco_method) { 667 tc = timecounter; 668 tvp->tv_sec = tc->tc_offset_sec; 669 tvp->tv_usec = tc->tc_offset_micro; 670 } else { 671 microuptime(tvp); 672 } 673 } 674 675 void 676 getnanouptime(struct timespec *tsp) 677 { 678 struct timecounter *tc; 679 680 if (!tco_method) { 681 tc = timecounter; 682 tsp->tv_sec = tc->tc_offset_sec; 683 tsp->tv_nsec = tc->tc_offset_nano >> 32; 684 } else { 685 nanouptime(tsp); 686 } 687 } 688 689 void 690 microuptime(struct timeval *tv) 691 { 692 struct timecounter *tc; 693 694 tc = timecounter; 695 tv->tv_sec = tc->tc_offset_sec; 696 tv->tv_usec = tc->tc_offset_micro; 697 tv->tv_usec += ((u_int64_t)tco_delta(tc) * tc->tc_scale_micro) >> 32; 698 while (tv->tv_usec < 0) { 699 tv->tv_usec += 1000000; 700 if (tv->tv_sec > 0) 701 tv->tv_sec--; 702 } 703 while (tv->tv_usec >= 1000000) { 704 tv->tv_usec -= 1000000; 705 tv->tv_sec++; 706 } 707 } 708 709 void 710 nanouptime(struct timespec *ts) 711 { 712 unsigned count; 713 u_int64_t delta; 714 struct timecounter *tc; 715 716 tc = timecounter; 717 ts->tv_sec = tc->tc_offset_sec; 718 count = tco_delta(tc); 719 delta = tc->tc_offset_nano; 720 delta += ((u_int64_t)count * tc->tc_scale_nano_f); 721 delta >>= 32; 722 delta += ((u_int64_t)count * tc->tc_scale_nano_i); 723 while (delta < 0) { 724 delta += 1000000000; 725 if (ts->tv_sec > 0) 726 ts->tv_sec--; 727 } 728 while (delta >= 1000000000) { 729 delta -= 1000000000; 730 ts->tv_sec++; 731 } 732 ts->tv_nsec = delta; 733 } 734 735 static void 736 tco_setscales(struct timecounter *tc) 737 { 738 u_int64_t scale; 739 740 scale = 1000000000LL << 32; 741 scale += tc->tc_adjustment; 742 scale /= tc->tc_tweak->tc_frequency; 743 tc->tc_scale_micro = scale / 1000; 744 tc->tc_scale_nano_f = scale & 0xffffffff; 745 tc->tc_scale_nano_i = scale >> 32; 746 } 747 748 void 749 update_timecounter(struct timecounter *tc) 750 { 751 tco_setscales(tc); 752 } 753 754 void 755 init_timecounter(struct timecounter *tc) 756 { 757 struct timespec ts1; 758 struct timecounter *t1, *t2, *t3; 759 unsigned u; 760 int i; 761 762 u = tc->tc_frequency / tc->tc_counter_mask; 763 if (u > hz) { 764 printf("Timecounter \"%s\" frequency %lu Hz" 765 " -- Insufficient hz, needs at least %u\n", 766 tc->tc_name, (u_long) tc->tc_frequency, u); 767 return; 768 } 769 770 tc->tc_adjustment = 0; 771 tc->tc_tweak = tc; 772 tco_setscales(tc); 773 tc->tc_offset_count = tc->tc_get_timecount(tc); 774 if (timecounter == &dummy_timecounter) 775 tc->tc_avail = tc; 776 else { 777 tc->tc_avail = timecounter->tc_tweak->tc_avail; 778 timecounter->tc_tweak->tc_avail = tc; 779 } 780 MALLOC(t1, struct timecounter *, sizeof *t1, M_TIMECOUNTER, M_WAITOK); 781 tc->tc_other = t1; 782 *t1 = *tc; 783 t2 = t1; 784 for (i = 1; i < NTIMECOUNTER; i++) { 785 MALLOC(t3, struct timecounter *, sizeof *t3, 786 M_TIMECOUNTER, M_WAITOK); 787 *t3 = *tc; 788 t3->tc_other = t2; 789 t2 = t3; 790 } 791 t1->tc_other = t3; 792 tc = t1; 793 794 printf("Timecounter \"%s\" frequency %lu Hz\n", 795 tc->tc_name, (u_long)tc->tc_frequency); 796 797 /* XXX: For now always start using the counter. */ 798 tc->tc_offset_count = tc->tc_get_timecount(tc); 799 nanouptime(&ts1); 800 tc->tc_offset_nano = (u_int64_t)ts1.tv_nsec << 32; 801 tc->tc_offset_micro = ts1.tv_nsec / 1000; 802 tc->tc_offset_sec = ts1.tv_sec; 803 timecounter = tc; 804 } 805 806 void 807 set_timecounter(struct timespec *ts) 808 { 809 struct timespec ts2; 810 811 nanouptime(&ts2); 812 boottime.tv_sec = ts->tv_sec - ts2.tv_sec; 813 boottime.tv_usec = (ts->tv_nsec - ts2.tv_nsec) / 1000; 814 if (boottime.tv_usec < 0) { 815 boottime.tv_usec += 1000000; 816 boottime.tv_sec--; 817 } 818 /* fiddle all the little crinkly bits around the fiords... */ 819 tco_forward(1); 820 } 821 822 static void 823 switch_timecounter(struct timecounter *newtc) 824 { 825 int s; 826 struct timecounter *tc; 827 struct timespec ts; 828 829 s = splclock(); 830 tc = timecounter; 831 if (newtc->tc_tweak == tc->tc_tweak) { 832 splx(s); 833 return; 834 } 835 newtc = newtc->tc_tweak->tc_other; 836 nanouptime(&ts); 837 newtc->tc_offset_sec = ts.tv_sec; 838 newtc->tc_offset_nano = (u_int64_t)ts.tv_nsec << 32; 839 newtc->tc_offset_micro = ts.tv_nsec / 1000; 840 newtc->tc_offset_count = newtc->tc_get_timecount(newtc); 841 tco_setscales(newtc); 842 timecounter = newtc; 843 splx(s); 844 } 845 846 static struct timecounter * 847 sync_other_counter(void) 848 { 849 struct timecounter *tc, *tcn, *tco; 850 unsigned delta; 851 852 tco = timecounter; 853 tc = tco->tc_other; 854 tcn = tc->tc_other; 855 *tc = *tco; 856 tc->tc_other = tcn; 857 delta = tco_delta(tc); 858 tc->tc_offset_count += delta; 859 tc->tc_offset_count &= tc->tc_counter_mask; 860 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_f; 861 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_i << 32; 862 return (tc); 863 } 864 865 static void 866 tco_forward(int force) 867 { 868 struct timecounter *tc, *tco; 869 struct timeval tvt; 870 871 tco = timecounter; 872 tc = sync_other_counter(); 873 /* 874 * We may be inducing a tiny error here, the tc_poll_pps() may 875 * process a latched count which happens after the tco_delta() 876 * in sync_other_counter(), which would extend the previous 877 * counters parameters into the domain of this new one. 878 * Since the timewindow is very small for this, the error is 879 * going to be only a few weenieseconds (as Dave Mills would 880 * say), so lets just not talk more about it, OK ? 881 */ 882 if (tco->tc_poll_pps) 883 tco->tc_poll_pps(tco); 884 if (timedelta != 0) { 885 tvt = boottime; 886 tvt.tv_usec += tickdelta; 887 if (tvt.tv_usec >= 1000000) { 888 tvt.tv_sec++; 889 tvt.tv_usec -= 1000000; 890 } else if (tvt.tv_usec < 0) { 891 tvt.tv_sec--; 892 tvt.tv_usec += 1000000; 893 } 894 boottime = tvt; 895 timedelta -= tickdelta; 896 } 897 898 while (tc->tc_offset_nano >= 1000000000ULL << 32) { 899 tc->tc_offset_nano -= 1000000000ULL << 32; 900 tc->tc_offset_sec++; 901 ntp_update_second(tc); /* XXX only needed if xntpd runs */ 902 tco_setscales(tc); 903 force++; 904 } 905 906 if (tco_method && !force) 907 return; 908 909 tc->tc_offset_micro = (tc->tc_offset_nano / 1000) >> 32; 910 911 /* Figure out the wall-clock time */ 912 tc->tc_nanotime.tv_sec = tc->tc_offset_sec + boottime.tv_sec; 913 tc->tc_nanotime.tv_nsec = 914 (tc->tc_offset_nano >> 32) + boottime.tv_usec * 1000; 915 tc->tc_microtime.tv_usec = tc->tc_offset_micro + boottime.tv_usec; 916 while (tc->tc_nanotime.tv_nsec >= 1000000000) { 917 tc->tc_nanotime.tv_nsec -= 1000000000; 918 tc->tc_microtime.tv_usec -= 1000000; 919 tc->tc_nanotime.tv_sec++; 920 } 921 time_second = tc->tc_microtime.tv_sec = tc->tc_nanotime.tv_sec; 922 923 timecounter = tc; 924 } 925 926 SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, ""); 927 928 SYSCTL_INT(_kern_timecounter, OID_AUTO, method, CTLFLAG_RW, &tco_method, 0, 929 "This variable determines the method used for updating timecounters. " 930 "If the default algorithm (0) fails with \"calcru negative...\" messages " 931 "try the alternate algorithm (1) which handles bad hardware better." 932 933 ); 934 935 static int 936 sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS) 937 { 938 char newname[32]; 939 struct timecounter *newtc, *tc; 940 int error; 941 942 tc = timecounter->tc_tweak; 943 strncpy(newname, tc->tc_name, sizeof(newname)); 944 error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req); 945 if (error == 0 && req->newptr != NULL && 946 strcmp(newname, tc->tc_name) != 0) { 947 for (newtc = tc->tc_avail; newtc != tc; 948 newtc = newtc->tc_avail) { 949 if (strcmp(newname, newtc->tc_name) == 0) { 950 /* Warm up new timecounter. */ 951 (void)newtc->tc_get_timecount(newtc); 952 953 switch_timecounter(newtc); 954 return (0); 955 } 956 } 957 return (EINVAL); 958 } 959 return (error); 960 } 961 962 SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW, 963 0, 0, sysctl_kern_timecounter_hardware, "A", ""); 964 965 966 int 967 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps) 968 { 969 pps_params_t *app; 970 struct pps_fetch_args *fapi; 971 #ifdef PPS_SYNC 972 struct pps_kcbind_args *kapi; 973 #endif 974 975 switch (cmd) { 976 case PPS_IOC_CREATE: 977 return (0); 978 case PPS_IOC_DESTROY: 979 return (0); 980 case PPS_IOC_SETPARAMS: 981 app = (pps_params_t *)data; 982 if (app->mode & ~pps->ppscap) 983 return (EINVAL); 984 pps->ppsparam = *app; 985 return (0); 986 case PPS_IOC_GETPARAMS: 987 app = (pps_params_t *)data; 988 *app = pps->ppsparam; 989 app->api_version = PPS_API_VERS_1; 990 return (0); 991 case PPS_IOC_GETCAP: 992 *(int*)data = pps->ppscap; 993 return (0); 994 case PPS_IOC_FETCH: 995 fapi = (struct pps_fetch_args *)data; 996 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC) 997 return (EINVAL); 998 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec) 999 return (EOPNOTSUPP); 1000 pps->ppsinfo.current_mode = pps->ppsparam.mode; 1001 fapi->pps_info_buf = pps->ppsinfo; 1002 return (0); 1003 case PPS_IOC_KCBIND: 1004 #ifdef PPS_SYNC 1005 kapi = (struct pps_kcbind_args *)data; 1006 /* XXX Only root should be able to do this */ 1007 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC) 1008 return (EINVAL); 1009 if (kapi->kernel_consumer != PPS_KC_HARDPPS) 1010 return (EINVAL); 1011 if (kapi->edge & ~pps->ppscap) 1012 return (EINVAL); 1013 pps->kcmode = kapi->edge; 1014 return (0); 1015 #else 1016 return (EOPNOTSUPP); 1017 #endif 1018 default: 1019 return (ENOTTY); 1020 } 1021 } 1022 1023 void 1024 pps_init(struct pps_state *pps) 1025 { 1026 pps->ppscap |= PPS_TSFMT_TSPEC; 1027 if (pps->ppscap & PPS_CAPTUREASSERT) 1028 pps->ppscap |= PPS_OFFSETASSERT; 1029 if (pps->ppscap & PPS_CAPTURECLEAR) 1030 pps->ppscap |= PPS_OFFSETCLEAR; 1031 } 1032 1033 void 1034 pps_event(struct pps_state *pps, struct timecounter *tc, unsigned count, int event) 1035 { 1036 struct timespec ts, *tsp, *osp; 1037 u_int64_t delta; 1038 unsigned tcount, *pcount; 1039 int foff, fhard; 1040 pps_seq_t *pseq; 1041 1042 /* Things would be easier with arrays... */ 1043 if (event == PPS_CAPTUREASSERT) { 1044 tsp = &pps->ppsinfo.assert_timestamp; 1045 osp = &pps->ppsparam.assert_offset; 1046 foff = pps->ppsparam.mode & PPS_OFFSETASSERT; 1047 fhard = pps->kcmode & PPS_CAPTUREASSERT; 1048 pcount = &pps->ppscount[0]; 1049 pseq = &pps->ppsinfo.assert_sequence; 1050 } else { 1051 tsp = &pps->ppsinfo.clear_timestamp; 1052 osp = &pps->ppsparam.clear_offset; 1053 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR; 1054 fhard = pps->kcmode & PPS_CAPTURECLEAR; 1055 pcount = &pps->ppscount[1]; 1056 pseq = &pps->ppsinfo.clear_sequence; 1057 } 1058 1059 /* The timecounter changed: bail */ 1060 if (!pps->ppstc || 1061 pps->ppstc->tc_name != tc->tc_name || 1062 tc->tc_name != timecounter->tc_name) { 1063 pps->ppstc = tc; 1064 *pcount = count; 1065 return; 1066 } 1067 1068 /* Nothing really happened */ 1069 if (*pcount == count) 1070 return; 1071 1072 *pcount = count; 1073 1074 /* Convert the count to timespec */ 1075 ts.tv_sec = tc->tc_offset_sec; 1076 tcount = count - tc->tc_offset_count; 1077 tcount &= tc->tc_counter_mask; 1078 delta = tc->tc_offset_nano; 1079 delta += ((u_int64_t)tcount * tc->tc_scale_nano_f); 1080 delta >>= 32; 1081 delta += ((u_int64_t)tcount * tc->tc_scale_nano_i); 1082 delta += boottime.tv_usec * 1000; 1083 ts.tv_sec += boottime.tv_sec; 1084 while (delta >= 1000000000) { 1085 delta -= 1000000000; 1086 ts.tv_sec++; 1087 } 1088 ts.tv_nsec = delta; 1089 1090 (*pseq)++; 1091 *tsp = ts; 1092 1093 if (foff) { 1094 timespecadd(tsp, osp); 1095 if (tsp->tv_nsec < 0) { 1096 tsp->tv_nsec += 1000000000; 1097 tsp->tv_sec -= 1; 1098 } 1099 } 1100 #ifdef PPS_SYNC 1101 if (fhard) { 1102 /* magic, at its best... */ 1103 tcount = count - pps->ppscount[2]; 1104 pps->ppscount[2] = count; 1105 tcount &= tc->tc_counter_mask; 1106 delta = ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_f); 1107 delta >>= 32; 1108 delta += ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_i); 1109 hardpps(tsp, delta); 1110 } 1111 #endif 1112 } 1113