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. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94 68 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $ 69 */ 70 71 #include "opt_ntp.h" 72 #include "opt_ifpoll.h" 73 #include "opt_pctrack.h" 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/callout.h> 78 #include <sys/kernel.h> 79 #include <sys/kinfo.h> 80 #include <sys/proc.h> 81 #include <sys/malloc.h> 82 #include <sys/resource.h> 83 #include <sys/resourcevar.h> 84 #include <sys/signalvar.h> 85 #include <sys/timex.h> 86 #include <sys/timepps.h> 87 #include <vm/vm.h> 88 #include <sys/lock.h> 89 #include <vm/pmap.h> 90 #include <vm/vm_map.h> 91 #include <vm/vm_extern.h> 92 #include <sys/sysctl.h> 93 94 #include <sys/thread2.h> 95 96 #include <machine/cpu.h> 97 #include <machine/limits.h> 98 #include <machine/smp.h> 99 #include <machine/cpufunc.h> 100 #include <machine/specialreg.h> 101 #include <machine/clock.h> 102 103 #ifdef GPROF 104 #include <sys/gmon.h> 105 #endif 106 107 #ifdef IFPOLL_ENABLE 108 extern void ifpoll_init_pcpu(int); 109 #endif 110 111 #ifdef DEBUG_PCTRACK 112 static void do_pctrack(struct intrframe *frame, int which); 113 #endif 114 115 static void initclocks (void *dummy); 116 SYSINIT(clocks, SI_BOOT2_CLOCKS, SI_ORDER_FIRST, initclocks, NULL) 117 118 /* 119 * Some of these don't belong here, but it's easiest to concentrate them. 120 * Note that cpu_time counts in microseconds, but most userland programs 121 * just compare relative times against the total by delta. 122 */ 123 struct kinfo_cputime cputime_percpu[MAXCPU]; 124 #ifdef DEBUG_PCTRACK 125 struct kinfo_pcheader cputime_pcheader = { PCTRACK_SIZE, PCTRACK_ARYSIZE }; 126 struct kinfo_pctrack cputime_pctrack[MAXCPU][PCTRACK_SIZE]; 127 #endif 128 129 static int 130 sysctl_cputime(SYSCTL_HANDLER_ARGS) 131 { 132 int cpu, error = 0; 133 size_t size = sizeof(struct kinfo_cputime); 134 135 for (cpu = 0; cpu < ncpus; ++cpu) { 136 if ((error = SYSCTL_OUT(req, &cputime_percpu[cpu], size))) 137 break; 138 } 139 140 return (error); 141 } 142 SYSCTL_PROC(_kern, OID_AUTO, cputime, (CTLTYPE_OPAQUE|CTLFLAG_RD), 0, 0, 143 sysctl_cputime, "S,kinfo_cputime", "CPU time statistics"); 144 145 static int 146 sysctl_cp_time(SYSCTL_HANDLER_ARGS) 147 { 148 long cpu_states[5] = {0}; 149 int cpu, error = 0; 150 size_t size = sizeof(cpu_states); 151 152 for (cpu = 0; cpu < ncpus; ++cpu) { 153 cpu_states[CP_USER] += cputime_percpu[cpu].cp_user; 154 cpu_states[CP_NICE] += cputime_percpu[cpu].cp_nice; 155 cpu_states[CP_SYS] += cputime_percpu[cpu].cp_sys; 156 cpu_states[CP_INTR] += cputime_percpu[cpu].cp_intr; 157 cpu_states[CP_IDLE] += cputime_percpu[cpu].cp_idle; 158 } 159 160 error = SYSCTL_OUT(req, cpu_states, size); 161 162 return (error); 163 } 164 165 SYSCTL_PROC(_kern, OID_AUTO, cp_time, (CTLTYPE_LONG|CTLFLAG_RD), 0, 0, 166 sysctl_cp_time, "LU", "CPU time statistics"); 167 168 /* 169 * boottime is used to calculate the 'real' uptime. Do not confuse this with 170 * microuptime(). microtime() is not drift compensated. The real uptime 171 * with compensation is nanotime() - bootime. boottime is recalculated 172 * whenever the real time is set based on the compensated elapsed time 173 * in seconds (gd->gd_time_seconds). 174 * 175 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic. 176 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to 177 * the real time. 178 */ 179 struct timespec boottime; /* boot time (realtime) for reference only */ 180 time_t time_second; /* read-only 'passive' uptime in seconds */ 181 time_t time_uptime; /* read-only 'passive' uptime in seconds */ 182 183 /* 184 * basetime is used to calculate the compensated real time of day. The 185 * basetime can be modified on a per-tick basis by the adjtime(), 186 * ntp_adjtime(), and sysctl-based time correction APIs. 187 * 188 * Note that frequency corrections can also be made by adjusting 189 * gd_cpuclock_base. 190 * 191 * basetime is a tail-chasing FIFO, updated only by cpu #0. The FIFO is 192 * used on both SMP and UP systems to avoid MP races between cpu's and 193 * interrupt races on UP systems. 194 */ 195 #define BASETIME_ARYSIZE 16 196 #define BASETIME_ARYMASK (BASETIME_ARYSIZE - 1) 197 static struct timespec basetime[BASETIME_ARYSIZE]; 198 static volatile int basetime_index; 199 200 static int 201 sysctl_get_basetime(SYSCTL_HANDLER_ARGS) 202 { 203 struct timespec *bt; 204 int error; 205 int index; 206 207 /* 208 * Because basetime data and index may be updated by another cpu, 209 * a load fence is required to ensure that the data we read has 210 * not been speculatively read relative to a possibly updated index. 211 */ 212 index = basetime_index; 213 cpu_lfence(); 214 bt = &basetime[index]; 215 error = SYSCTL_OUT(req, bt, sizeof(*bt)); 216 return (error); 217 } 218 219 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD, 220 &boottime, timespec, "System boottime"); 221 SYSCTL_PROC(_kern, OID_AUTO, basetime, CTLTYPE_STRUCT|CTLFLAG_RD, 0, 0, 222 sysctl_get_basetime, "S,timespec", "System basetime"); 223 224 static void hardclock(systimer_t info, int, struct intrframe *frame); 225 static void statclock(systimer_t info, int, struct intrframe *frame); 226 static void schedclock(systimer_t info, int, struct intrframe *frame); 227 static void getnanotime_nbt(struct timespec *nbt, struct timespec *tsp); 228 229 int ticks; /* system master ticks at hz */ 230 int clocks_running; /* tsleep/timeout clocks operational */ 231 int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */ 232 int64_t nsec_acc; /* accumulator */ 233 int sched_ticks; /* global schedule clock ticks */ 234 235 /* NTPD time correction fields */ 236 int64_t ntp_tick_permanent; /* per-tick adjustment in nsec << 32 */ 237 int64_t ntp_tick_acc; /* accumulator for per-tick adjustment */ 238 int64_t ntp_delta; /* one-time correction in nsec */ 239 int64_t ntp_big_delta = 1000000000; 240 int32_t ntp_tick_delta; /* current adjustment rate */ 241 int32_t ntp_default_tick_delta; /* adjustment rate for ntp_delta */ 242 time_t ntp_leap_second; /* time of next leap second */ 243 int ntp_leap_insert; /* whether to insert or remove a second */ 244 245 /* 246 * Finish initializing clock frequencies and start all clocks running. 247 */ 248 /* ARGSUSED*/ 249 static void 250 initclocks(void *dummy) 251 { 252 /*psratio = profhz / stathz;*/ 253 initclocks_pcpu(); 254 clocks_running = 1; 255 } 256 257 /* 258 * Called on a per-cpu basis 259 */ 260 void 261 initclocks_pcpu(void) 262 { 263 struct globaldata *gd = mycpu; 264 265 crit_enter(); 266 if (gd->gd_cpuid == 0) { 267 gd->gd_time_seconds = 1; 268 gd->gd_cpuclock_base = sys_cputimer->count(); 269 } else { 270 /* XXX */ 271 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds; 272 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base; 273 } 274 275 systimer_intr_enable(); 276 277 #ifdef IFPOLL_ENABLE 278 ifpoll_init_pcpu(gd->gd_cpuid); 279 #endif 280 281 /* 282 * Use a non-queued periodic systimer to prevent multiple ticks from 283 * building up if the sysclock jumps forward (8254 gets reset). The 284 * sysclock will never jump backwards. Our time sync is based on 285 * the actual sysclock, not the ticks count. 286 */ 287 systimer_init_periodic_nq(&gd->gd_hardclock, hardclock, NULL, hz); 288 systimer_init_periodic_nq(&gd->gd_statclock, statclock, NULL, stathz); 289 /* XXX correct the frequency for scheduler / estcpu tests */ 290 systimer_init_periodic_nq(&gd->gd_schedclock, schedclock, 291 NULL, ESTCPUFREQ); 292 crit_exit(); 293 } 294 295 /* 296 * This sets the current real time of day. Timespecs are in seconds and 297 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base, 298 * instead we adjust basetime so basetime + gd_* results in the current 299 * time of day. This way the gd_* fields are guarenteed to represent 300 * a monotonically increasing 'uptime' value. 301 * 302 * When set_timeofday() is called from userland, the system call forces it 303 * onto cpu #0 since only cpu #0 can update basetime_index. 304 */ 305 void 306 set_timeofday(struct timespec *ts) 307 { 308 struct timespec *nbt; 309 int ni; 310 311 /* 312 * XXX SMP / non-atomic basetime updates 313 */ 314 crit_enter(); 315 ni = (basetime_index + 1) & BASETIME_ARYMASK; 316 nbt = &basetime[ni]; 317 nanouptime(nbt); 318 nbt->tv_sec = ts->tv_sec - nbt->tv_sec; 319 nbt->tv_nsec = ts->tv_nsec - nbt->tv_nsec; 320 if (nbt->tv_nsec < 0) { 321 nbt->tv_nsec += 1000000000; 322 --nbt->tv_sec; 323 } 324 325 /* 326 * Note that basetime diverges from boottime as the clock drift is 327 * compensated for, so we cannot do away with boottime. When setting 328 * the absolute time of day the drift is 0 (for an instant) and we 329 * can simply assign boottime to basetime. 330 * 331 * Note that nanouptime() is based on gd_time_seconds which is drift 332 * compensated up to a point (it is guarenteed to remain monotonically 333 * increasing). gd_time_seconds is thus our best uptime guess and 334 * suitable for use in the boottime calculation. It is already taken 335 * into account in the basetime calculation above. 336 */ 337 boottime.tv_sec = nbt->tv_sec; 338 ntp_delta = 0; 339 340 /* 341 * We now have a new basetime, make sure all other cpus have it, 342 * then update the index. 343 */ 344 cpu_sfence(); 345 basetime_index = ni; 346 347 crit_exit(); 348 } 349 350 /* 351 * Each cpu has its own hardclock, but we only increments ticks and softticks 352 * on cpu #0. 353 * 354 * NOTE! systimer! the MP lock might not be held here. We can only safely 355 * manipulate objects owned by the current cpu. 356 */ 357 static void 358 hardclock(systimer_t info, int in_ipi __unused, struct intrframe *frame) 359 { 360 sysclock_t cputicks; 361 struct proc *p; 362 struct globaldata *gd = mycpu; 363 364 /* 365 * Realtime updates are per-cpu. Note that timer corrections as 366 * returned by microtime() and friends make an additional adjustment 367 * using a system-wise 'basetime', but the running time is always 368 * taken from the per-cpu globaldata area. Since the same clock 369 * is distributing (XXX SMP) to all cpus, the per-cpu timebases 370 * stay in synch. 371 * 372 * Note that we never allow info->time (aka gd->gd_hardclock.time) 373 * to reverse index gd_cpuclock_base, but that it is possible for 374 * it to temporarily get behind in the seconds if something in the 375 * system locks interrupts for a long period of time. Since periodic 376 * timers count events, though everything should resynch again 377 * immediately. 378 */ 379 cputicks = info->time - gd->gd_cpuclock_base; 380 if (cputicks >= sys_cputimer->freq) { 381 ++gd->gd_time_seconds; 382 gd->gd_cpuclock_base += sys_cputimer->freq; 383 if (gd->gd_cpuid == 0) 384 ++time_uptime; /* uncorrected monotonic 1-sec gran */ 385 } 386 387 /* 388 * The system-wide ticks counter and NTP related timedelta/tickdelta 389 * adjustments only occur on cpu #0. NTP adjustments are accomplished 390 * by updating basetime. 391 */ 392 if (gd->gd_cpuid == 0) { 393 struct timespec *nbt; 394 struct timespec nts; 395 int leap; 396 int ni; 397 398 ++ticks; 399 400 #if 0 401 if (tco->tc_poll_pps) 402 tco->tc_poll_pps(tco); 403 #endif 404 405 /* 406 * Calculate the new basetime index. We are in a critical section 407 * on cpu #0 and can safely play with basetime_index. Start 408 * with the current basetime and then make adjustments. 409 */ 410 ni = (basetime_index + 1) & BASETIME_ARYMASK; 411 nbt = &basetime[ni]; 412 *nbt = basetime[basetime_index]; 413 414 /* 415 * Apply adjtime corrections. (adjtime() API) 416 * 417 * adjtime() only runs on cpu #0 so our critical section is 418 * sufficient to access these variables. 419 */ 420 if (ntp_delta != 0) { 421 nbt->tv_nsec += ntp_tick_delta; 422 ntp_delta -= ntp_tick_delta; 423 if ((ntp_delta > 0 && ntp_delta < ntp_tick_delta) || 424 (ntp_delta < 0 && ntp_delta > ntp_tick_delta)) { 425 ntp_tick_delta = ntp_delta; 426 } 427 } 428 429 /* 430 * Apply permanent frequency corrections. (sysctl API) 431 */ 432 if (ntp_tick_permanent != 0) { 433 ntp_tick_acc += ntp_tick_permanent; 434 if (ntp_tick_acc >= (1LL << 32)) { 435 nbt->tv_nsec += ntp_tick_acc >> 32; 436 ntp_tick_acc -= (ntp_tick_acc >> 32) << 32; 437 } else if (ntp_tick_acc <= -(1LL << 32)) { 438 /* Negate ntp_tick_acc to avoid shifting the sign bit. */ 439 nbt->tv_nsec -= (-ntp_tick_acc) >> 32; 440 ntp_tick_acc += ((-ntp_tick_acc) >> 32) << 32; 441 } 442 } 443 444 if (nbt->tv_nsec >= 1000000000) { 445 nbt->tv_sec++; 446 nbt->tv_nsec -= 1000000000; 447 } else if (nbt->tv_nsec < 0) { 448 nbt->tv_sec--; 449 nbt->tv_nsec += 1000000000; 450 } 451 452 /* 453 * Another per-tick compensation. (for ntp_adjtime() API) 454 */ 455 if (nsec_adj != 0) { 456 nsec_acc += nsec_adj; 457 if (nsec_acc >= 0x100000000LL) { 458 nbt->tv_nsec += nsec_acc >> 32; 459 nsec_acc = (nsec_acc & 0xFFFFFFFFLL); 460 } else if (nsec_acc <= -0x100000000LL) { 461 nbt->tv_nsec -= -nsec_acc >> 32; 462 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL); 463 } 464 if (nbt->tv_nsec >= 1000000000) { 465 nbt->tv_nsec -= 1000000000; 466 ++nbt->tv_sec; 467 } else if (nbt->tv_nsec < 0) { 468 nbt->tv_nsec += 1000000000; 469 --nbt->tv_sec; 470 } 471 } 472 473 /************************************************************ 474 * LEAP SECOND CORRECTION * 475 ************************************************************ 476 * 477 * Taking into account all the corrections made above, figure 478 * out the new real time. If the seconds field has changed 479 * then apply any pending leap-second corrections. 480 */ 481 getnanotime_nbt(nbt, &nts); 482 483 if (time_second != nts.tv_sec) { 484 /* 485 * Apply leap second (sysctl API). Adjust nts for changes 486 * so we do not have to call getnanotime_nbt again. 487 */ 488 if (ntp_leap_second) { 489 if (ntp_leap_second == nts.tv_sec) { 490 if (ntp_leap_insert) { 491 nbt->tv_sec++; 492 nts.tv_sec++; 493 } else { 494 nbt->tv_sec--; 495 nts.tv_sec--; 496 } 497 ntp_leap_second--; 498 } 499 } 500 501 /* 502 * Apply leap second (ntp_adjtime() API), calculate a new 503 * nsec_adj field. ntp_update_second() returns nsec_adj 504 * as a per-second value but we need it as a per-tick value. 505 */ 506 leap = ntp_update_second(time_second, &nsec_adj); 507 nsec_adj /= hz; 508 nbt->tv_sec += leap; 509 nts.tv_sec += leap; 510 511 /* 512 * Update the time_second 'approximate time' global. 513 */ 514 time_second = nts.tv_sec; 515 } 516 517 /* 518 * Finally, our new basetime is ready to go live! 519 */ 520 cpu_sfence(); 521 basetime_index = ni; 522 } 523 524 /* 525 * lwkt thread scheduler fair queueing 526 */ 527 lwkt_schedulerclock(curthread); 528 529 /* 530 * softticks are handled for all cpus 531 */ 532 hardclock_softtick(gd); 533 534 /* 535 * ITimer handling is per-tick, per-cpu. 536 * 537 * We must acquire the per-process token in order for ksignal() 538 * to be non-blocking. For the moment this requires an AST fault, 539 * the ksignal() cannot be safely issued from this hard interrupt. 540 * 541 * XXX Even the trytoken here isn't right, and itimer operation in 542 * a multi threaded environment is going to be weird at the 543 * very least. 544 */ 545 if ((p = curproc) != NULL && lwkt_trytoken(&p->p_token)) { 546 crit_enter_hard(); 547 if (frame && CLKF_USERMODE(frame) && 548 timevalisset(&p->p_timer[ITIMER_VIRTUAL].it_value) && 549 itimerdecr(&p->p_timer[ITIMER_VIRTUAL], ustick) == 0) { 550 p->p_flags |= P_SIGVTALRM; 551 need_user_resched(); 552 } 553 if (timevalisset(&p->p_timer[ITIMER_PROF].it_value) && 554 itimerdecr(&p->p_timer[ITIMER_PROF], ustick) == 0) { 555 p->p_flags |= P_SIGPROF; 556 need_user_resched(); 557 } 558 crit_exit_hard(); 559 lwkt_reltoken(&p->p_token); 560 } 561 setdelayed(); 562 } 563 564 /* 565 * The statistics clock typically runs at a 125Hz rate, and is intended 566 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu. 567 * 568 * NOTE! systimer! the MP lock might not be held here. We can only safely 569 * manipulate objects owned by the current cpu. 570 * 571 * The stats clock is responsible for grabbing a profiling sample. 572 * Most of the statistics are only used by user-level statistics programs. 573 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and 574 * p->p_estcpu. 575 * 576 * Like the other clocks, the stat clock is called from what is effectively 577 * a fast interrupt, so the context should be the thread/process that got 578 * interrupted. 579 */ 580 static void 581 statclock(systimer_t info, int in_ipi, struct intrframe *frame) 582 { 583 #ifdef GPROF 584 struct gmonparam *g; 585 int i; 586 #endif 587 thread_t td; 588 struct proc *p; 589 int bump; 590 struct timeval tv; 591 struct timeval *stv; 592 593 /* 594 * How big was our timeslice relative to the last time? 595 */ 596 microuptime(&tv); /* mpsafe */ 597 stv = &mycpu->gd_stattv; 598 if (stv->tv_sec == 0) { 599 bump = 1; 600 } else { 601 bump = tv.tv_usec - stv->tv_usec + 602 (tv.tv_sec - stv->tv_sec) * 1000000; 603 if (bump < 0) 604 bump = 0; 605 if (bump > 1000000) 606 bump = 1000000; 607 } 608 *stv = tv; 609 610 td = curthread; 611 p = td->td_proc; 612 613 if (frame && CLKF_USERMODE(frame)) { 614 /* 615 * Came from userland, handle user time and deal with 616 * possible process. 617 */ 618 if (p && (p->p_flags & P_PROFIL)) 619 addupc_intr(p, CLKF_PC(frame), 1); 620 td->td_uticks += bump; 621 622 /* 623 * Charge the time as appropriate 624 */ 625 if (p && p->p_nice > NZERO) 626 cpu_time.cp_nice += bump; 627 else 628 cpu_time.cp_user += bump; 629 } else { 630 int intr_nest = mycpu->gd_intr_nesting_level; 631 632 if (in_ipi) { 633 /* 634 * IPI processing code will bump gd_intr_nesting_level 635 * up by one, which breaks following CLKF_INTR testing, 636 * so we substract it by one here. 637 */ 638 --intr_nest; 639 } 640 #ifdef GPROF 641 /* 642 * Kernel statistics are just like addupc_intr, only easier. 643 */ 644 g = &_gmonparam; 645 if (g->state == GMON_PROF_ON && frame) { 646 i = CLKF_PC(frame) - g->lowpc; 647 if (i < g->textsize) { 648 i /= HISTFRACTION * sizeof(*g->kcount); 649 g->kcount[i]++; 650 } 651 } 652 #endif 653 654 #define IS_INTR_RUNNING ((frame && CLKF_INTR(intr_nest)) || CLKF_INTR_TD(td)) 655 656 /* 657 * Came from kernel mode, so we were: 658 * - handling an interrupt, 659 * - doing syscall or trap work on behalf of the current 660 * user process, or 661 * - spinning in the idle loop. 662 * Whichever it is, charge the time as appropriate. 663 * Note that we charge interrupts to the current process, 664 * regardless of whether they are ``for'' that process, 665 * so that we know how much of its real time was spent 666 * in ``non-process'' (i.e., interrupt) work. 667 * 668 * XXX assume system if frame is NULL. A NULL frame 669 * can occur if ipi processing is done from a crit_exit(). 670 */ 671 if (IS_INTR_RUNNING) 672 td->td_iticks += bump; 673 else 674 td->td_sticks += bump; 675 676 if (IS_INTR_RUNNING) { 677 /* 678 * If we interrupted an interrupt thread, well, 679 * count it as interrupt time. 680 */ 681 #ifdef DEBUG_PCTRACK 682 if (frame) 683 do_pctrack(frame, PCTRACK_INT); 684 #endif 685 cpu_time.cp_intr += bump; 686 } else { 687 if (td == &mycpu->gd_idlethread) { 688 /* 689 * Even if the current thread is the idle 690 * thread it could be due to token contention 691 * in the LWKT scheduler. Count such as 692 * system time. 693 */ 694 if (mycpu->gd_reqflags & RQF_AST_LWKT_RESCHED) 695 cpu_time.cp_sys += bump; 696 else 697 cpu_time.cp_idle += bump; 698 } else { 699 /* 700 * System thread was running. 701 */ 702 #ifdef DEBUG_PCTRACK 703 if (frame) 704 do_pctrack(frame, PCTRACK_SYS); 705 #endif 706 cpu_time.cp_sys += bump; 707 } 708 } 709 710 #undef IS_INTR_RUNNING 711 } 712 } 713 714 #ifdef DEBUG_PCTRACK 715 /* 716 * Sample the PC when in the kernel or in an interrupt. User code can 717 * retrieve the information and generate a histogram or other output. 718 */ 719 720 static void 721 do_pctrack(struct intrframe *frame, int which) 722 { 723 struct kinfo_pctrack *pctrack; 724 725 pctrack = &cputime_pctrack[mycpu->gd_cpuid][which]; 726 pctrack->pc_array[pctrack->pc_index & PCTRACK_ARYMASK] = 727 (void *)CLKF_PC(frame); 728 ++pctrack->pc_index; 729 } 730 731 static int 732 sysctl_pctrack(SYSCTL_HANDLER_ARGS) 733 { 734 struct kinfo_pcheader head; 735 int error; 736 int cpu; 737 int ntrack; 738 739 head.pc_ntrack = PCTRACK_SIZE; 740 head.pc_arysize = PCTRACK_ARYSIZE; 741 742 if ((error = SYSCTL_OUT(req, &head, sizeof(head))) != 0) 743 return (error); 744 745 for (cpu = 0; cpu < ncpus; ++cpu) { 746 for (ntrack = 0; ntrack < PCTRACK_SIZE; ++ntrack) { 747 error = SYSCTL_OUT(req, &cputime_pctrack[cpu][ntrack], 748 sizeof(struct kinfo_pctrack)); 749 if (error) 750 break; 751 } 752 if (error) 753 break; 754 } 755 return (error); 756 } 757 SYSCTL_PROC(_kern, OID_AUTO, pctrack, (CTLTYPE_OPAQUE|CTLFLAG_RD), 0, 0, 758 sysctl_pctrack, "S,kinfo_pcheader", "CPU PC tracking"); 759 760 #endif 761 762 /* 763 * The scheduler clock typically runs at a 50Hz rate. NOTE! systimer, 764 * the MP lock might not be held. We can safely manipulate parts of curproc 765 * but that's about it. 766 * 767 * Each cpu has its own scheduler clock. 768 */ 769 static void 770 schedclock(systimer_t info, int in_ipi __unused, struct intrframe *frame) 771 { 772 struct lwp *lp; 773 struct rusage *ru; 774 struct vmspace *vm; 775 long rss; 776 777 if ((lp = lwkt_preempted_proc()) != NULL) { 778 /* 779 * Account for cpu time used and hit the scheduler. Note 780 * that this call MUST BE MP SAFE, and the BGL IS NOT HELD 781 * HERE. 782 */ 783 ++lp->lwp_cpticks; 784 usched_schedulerclock(lp, info->periodic, info->time); 785 } else { 786 usched_schedulerclock(NULL, info->periodic, info->time); 787 } 788 if ((lp = curthread->td_lwp) != NULL) { 789 /* 790 * Update resource usage integrals and maximums. 791 */ 792 if ((ru = &lp->lwp_proc->p_ru) && 793 (vm = lp->lwp_proc->p_vmspace) != NULL) { 794 ru->ru_ixrss += pgtok(vm->vm_tsize); 795 ru->ru_idrss += pgtok(vm->vm_dsize); 796 ru->ru_isrss += pgtok(vm->vm_ssize); 797 if (lwkt_trytoken(&vm->vm_map.token)) { 798 rss = pgtok(vmspace_resident_count(vm)); 799 if (ru->ru_maxrss < rss) 800 ru->ru_maxrss = rss; 801 lwkt_reltoken(&vm->vm_map.token); 802 } 803 } 804 } 805 /* Increment the global sched_ticks */ 806 if (mycpu->gd_cpuid == 0) 807 ++sched_ticks; 808 } 809 810 /* 811 * Compute number of ticks for the specified amount of time. The 812 * return value is intended to be used in a clock interrupt timed 813 * operation and guarenteed to meet or exceed the requested time. 814 * If the representation overflows, return INT_MAX. The minimum return 815 * value is 1 ticks and the function will average the calculation up. 816 * If any value greater then 0 microseconds is supplied, a value 817 * of at least 2 will be returned to ensure that a near-term clock 818 * interrupt does not cause the timeout to occur (degenerately) early. 819 * 820 * Note that limit checks must take into account microseconds, which is 821 * done simply by using the smaller signed long maximum instead of 822 * the unsigned long maximum. 823 * 824 * If ints have 32 bits, then the maximum value for any timeout in 825 * 10ms ticks is 248 days. 826 */ 827 int 828 tvtohz_high(struct timeval *tv) 829 { 830 int ticks; 831 long sec, usec; 832 833 sec = tv->tv_sec; 834 usec = tv->tv_usec; 835 if (usec < 0) { 836 sec--; 837 usec += 1000000; 838 } 839 if (sec < 0) { 840 #ifdef DIAGNOSTIC 841 if (usec > 0) { 842 sec++; 843 usec -= 1000000; 844 } 845 kprintf("tvtohz_high: negative time difference " 846 "%ld sec %ld usec\n", 847 sec, usec); 848 #endif 849 ticks = 1; 850 } else if (sec <= INT_MAX / hz) { 851 ticks = (int)(sec * hz + 852 ((u_long)usec + (ustick - 1)) / ustick) + 1; 853 } else { 854 ticks = INT_MAX; 855 } 856 return (ticks); 857 } 858 859 int 860 tstohz_high(struct timespec *ts) 861 { 862 int ticks; 863 long sec, nsec; 864 865 sec = ts->tv_sec; 866 nsec = ts->tv_nsec; 867 if (nsec < 0) { 868 sec--; 869 nsec += 1000000000; 870 } 871 if (sec < 0) { 872 #ifdef DIAGNOSTIC 873 if (nsec > 0) { 874 sec++; 875 nsec -= 1000000000; 876 } 877 kprintf("tstohz_high: negative time difference " 878 "%ld sec %ld nsec\n", 879 sec, nsec); 880 #endif 881 ticks = 1; 882 } else if (sec <= INT_MAX / hz) { 883 ticks = (int)(sec * hz + 884 ((u_long)nsec + (nstick - 1)) / nstick) + 1; 885 } else { 886 ticks = INT_MAX; 887 } 888 return (ticks); 889 } 890 891 892 /* 893 * Compute number of ticks for the specified amount of time, erroring on 894 * the side of it being too low to ensure that sleeping the returned number 895 * of ticks will not result in a late return. 896 * 897 * The supplied timeval may not be negative and should be normalized. A 898 * return value of 0 is possible if the timeval converts to less then 899 * 1 tick. 900 * 901 * If ints have 32 bits, then the maximum value for any timeout in 902 * 10ms ticks is 248 days. 903 */ 904 int 905 tvtohz_low(struct timeval *tv) 906 { 907 int ticks; 908 long sec; 909 910 sec = tv->tv_sec; 911 if (sec <= INT_MAX / hz) 912 ticks = (int)(sec * hz + (u_long)tv->tv_usec / ustick); 913 else 914 ticks = INT_MAX; 915 return (ticks); 916 } 917 918 int 919 tstohz_low(struct timespec *ts) 920 { 921 int ticks; 922 long sec; 923 924 sec = ts->tv_sec; 925 if (sec <= INT_MAX / hz) 926 ticks = (int)(sec * hz + (u_long)ts->tv_nsec / nstick); 927 else 928 ticks = INT_MAX; 929 return (ticks); 930 } 931 932 /* 933 * Start profiling on a process. 934 * 935 * Kernel profiling passes proc0 which never exits and hence 936 * keeps the profile clock running constantly. 937 */ 938 void 939 startprofclock(struct proc *p) 940 { 941 if ((p->p_flags & P_PROFIL) == 0) { 942 p->p_flags |= P_PROFIL; 943 #if 0 /* XXX */ 944 if (++profprocs == 1 && stathz != 0) { 945 crit_enter(); 946 psdiv = psratio; 947 setstatclockrate(profhz); 948 crit_exit(); 949 } 950 #endif 951 } 952 } 953 954 /* 955 * Stop profiling on a process. 956 * 957 * caller must hold p->p_token 958 */ 959 void 960 stopprofclock(struct proc *p) 961 { 962 if (p->p_flags & P_PROFIL) { 963 p->p_flags &= ~P_PROFIL; 964 #if 0 /* XXX */ 965 if (--profprocs == 0 && stathz != 0) { 966 crit_enter(); 967 psdiv = 1; 968 setstatclockrate(stathz); 969 crit_exit(); 970 } 971 #endif 972 } 973 } 974 975 /* 976 * Return information about system clocks. 977 */ 978 static int 979 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS) 980 { 981 struct kinfo_clockinfo clkinfo; 982 /* 983 * Construct clockinfo structure. 984 */ 985 clkinfo.ci_hz = hz; 986 clkinfo.ci_tick = ustick; 987 clkinfo.ci_tickadj = ntp_default_tick_delta / 1000; 988 clkinfo.ci_profhz = profhz; 989 clkinfo.ci_stathz = stathz ? stathz : hz; 990 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req)); 991 } 992 993 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD, 994 0, 0, sysctl_kern_clockrate, "S,clockinfo",""); 995 996 /* 997 * We have eight functions for looking at the clock, four for 998 * microseconds and four for nanoseconds. For each there is fast 999 * but less precise version "get{nano|micro}[up]time" which will 1000 * return a time which is up to 1/HZ previous to the call, whereas 1001 * the raw version "{nano|micro}[up]time" will return a timestamp 1002 * which is as precise as possible. The "up" variants return the 1003 * time relative to system boot, these are well suited for time 1004 * interval measurements. 1005 * 1006 * Each cpu independantly maintains the current time of day, so all 1007 * we need to do to protect ourselves from changes is to do a loop 1008 * check on the seconds field changing out from under us. 1009 * 1010 * The system timer maintains a 32 bit count and due to various issues 1011 * it is possible for the calculated delta to occassionally exceed 1012 * sys_cputimer->freq. If this occurs the sys_cputimer->freq64_nsec 1013 * multiplication can easily overflow, so we deal with the case. For 1014 * uniformity we deal with the case in the usec case too. 1015 * 1016 * All the [get][micro,nano][time,uptime]() routines are MPSAFE. 1017 */ 1018 void 1019 getmicrouptime(struct timeval *tvp) 1020 { 1021 struct globaldata *gd = mycpu; 1022 sysclock_t delta; 1023 1024 do { 1025 tvp->tv_sec = gd->gd_time_seconds; 1026 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1027 } while (tvp->tv_sec != gd->gd_time_seconds); 1028 1029 if (delta >= sys_cputimer->freq) { 1030 tvp->tv_sec += delta / sys_cputimer->freq; 1031 delta %= sys_cputimer->freq; 1032 } 1033 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 1034 if (tvp->tv_usec >= 1000000) { 1035 tvp->tv_usec -= 1000000; 1036 ++tvp->tv_sec; 1037 } 1038 } 1039 1040 void 1041 getnanouptime(struct timespec *tsp) 1042 { 1043 struct globaldata *gd = mycpu; 1044 sysclock_t delta; 1045 1046 do { 1047 tsp->tv_sec = gd->gd_time_seconds; 1048 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1049 } while (tsp->tv_sec != gd->gd_time_seconds); 1050 1051 if (delta >= sys_cputimer->freq) { 1052 tsp->tv_sec += delta / sys_cputimer->freq; 1053 delta %= sys_cputimer->freq; 1054 } 1055 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1056 } 1057 1058 void 1059 microuptime(struct timeval *tvp) 1060 { 1061 struct globaldata *gd = mycpu; 1062 sysclock_t delta; 1063 1064 do { 1065 tvp->tv_sec = gd->gd_time_seconds; 1066 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1067 } while (tvp->tv_sec != gd->gd_time_seconds); 1068 1069 if (delta >= sys_cputimer->freq) { 1070 tvp->tv_sec += delta / sys_cputimer->freq; 1071 delta %= sys_cputimer->freq; 1072 } 1073 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 1074 } 1075 1076 void 1077 nanouptime(struct timespec *tsp) 1078 { 1079 struct globaldata *gd = mycpu; 1080 sysclock_t delta; 1081 1082 do { 1083 tsp->tv_sec = gd->gd_time_seconds; 1084 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1085 } while (tsp->tv_sec != gd->gd_time_seconds); 1086 1087 if (delta >= sys_cputimer->freq) { 1088 tsp->tv_sec += delta / sys_cputimer->freq; 1089 delta %= sys_cputimer->freq; 1090 } 1091 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1092 } 1093 1094 /* 1095 * realtime routines 1096 */ 1097 void 1098 getmicrotime(struct timeval *tvp) 1099 { 1100 struct globaldata *gd = mycpu; 1101 struct timespec *bt; 1102 sysclock_t delta; 1103 1104 do { 1105 tvp->tv_sec = gd->gd_time_seconds; 1106 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1107 } while (tvp->tv_sec != gd->gd_time_seconds); 1108 1109 if (delta >= sys_cputimer->freq) { 1110 tvp->tv_sec += delta / sys_cputimer->freq; 1111 delta %= sys_cputimer->freq; 1112 } 1113 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 1114 1115 bt = &basetime[basetime_index]; 1116 tvp->tv_sec += bt->tv_sec; 1117 tvp->tv_usec += bt->tv_nsec / 1000; 1118 while (tvp->tv_usec >= 1000000) { 1119 tvp->tv_usec -= 1000000; 1120 ++tvp->tv_sec; 1121 } 1122 } 1123 1124 void 1125 getnanotime(struct timespec *tsp) 1126 { 1127 struct globaldata *gd = mycpu; 1128 struct timespec *bt; 1129 sysclock_t delta; 1130 1131 do { 1132 tsp->tv_sec = gd->gd_time_seconds; 1133 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1134 } while (tsp->tv_sec != gd->gd_time_seconds); 1135 1136 if (delta >= sys_cputimer->freq) { 1137 tsp->tv_sec += delta / sys_cputimer->freq; 1138 delta %= sys_cputimer->freq; 1139 } 1140 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1141 1142 bt = &basetime[basetime_index]; 1143 tsp->tv_sec += bt->tv_sec; 1144 tsp->tv_nsec += bt->tv_nsec; 1145 while (tsp->tv_nsec >= 1000000000) { 1146 tsp->tv_nsec -= 1000000000; 1147 ++tsp->tv_sec; 1148 } 1149 } 1150 1151 static void 1152 getnanotime_nbt(struct timespec *nbt, struct timespec *tsp) 1153 { 1154 struct globaldata *gd = mycpu; 1155 sysclock_t delta; 1156 1157 do { 1158 tsp->tv_sec = gd->gd_time_seconds; 1159 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1160 } while (tsp->tv_sec != gd->gd_time_seconds); 1161 1162 if (delta >= sys_cputimer->freq) { 1163 tsp->tv_sec += delta / sys_cputimer->freq; 1164 delta %= sys_cputimer->freq; 1165 } 1166 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1167 1168 tsp->tv_sec += nbt->tv_sec; 1169 tsp->tv_nsec += nbt->tv_nsec; 1170 while (tsp->tv_nsec >= 1000000000) { 1171 tsp->tv_nsec -= 1000000000; 1172 ++tsp->tv_sec; 1173 } 1174 } 1175 1176 1177 void 1178 microtime(struct timeval *tvp) 1179 { 1180 struct globaldata *gd = mycpu; 1181 struct timespec *bt; 1182 sysclock_t delta; 1183 1184 do { 1185 tvp->tv_sec = gd->gd_time_seconds; 1186 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1187 } while (tvp->tv_sec != gd->gd_time_seconds); 1188 1189 if (delta >= sys_cputimer->freq) { 1190 tvp->tv_sec += delta / sys_cputimer->freq; 1191 delta %= sys_cputimer->freq; 1192 } 1193 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 1194 1195 bt = &basetime[basetime_index]; 1196 tvp->tv_sec += bt->tv_sec; 1197 tvp->tv_usec += bt->tv_nsec / 1000; 1198 while (tvp->tv_usec >= 1000000) { 1199 tvp->tv_usec -= 1000000; 1200 ++tvp->tv_sec; 1201 } 1202 } 1203 1204 void 1205 nanotime(struct timespec *tsp) 1206 { 1207 struct globaldata *gd = mycpu; 1208 struct timespec *bt; 1209 sysclock_t delta; 1210 1211 do { 1212 tsp->tv_sec = gd->gd_time_seconds; 1213 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1214 } while (tsp->tv_sec != gd->gd_time_seconds); 1215 1216 if (delta >= sys_cputimer->freq) { 1217 tsp->tv_sec += delta / sys_cputimer->freq; 1218 delta %= sys_cputimer->freq; 1219 } 1220 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1221 1222 bt = &basetime[basetime_index]; 1223 tsp->tv_sec += bt->tv_sec; 1224 tsp->tv_nsec += bt->tv_nsec; 1225 while (tsp->tv_nsec >= 1000000000) { 1226 tsp->tv_nsec -= 1000000000; 1227 ++tsp->tv_sec; 1228 } 1229 } 1230 1231 /* 1232 * note: this is not exactly synchronized with real time. To do that we 1233 * would have to do what microtime does and check for a nanoseconds overflow. 1234 */ 1235 time_t 1236 get_approximate_time_t(void) 1237 { 1238 struct globaldata *gd = mycpu; 1239 struct timespec *bt; 1240 1241 bt = &basetime[basetime_index]; 1242 return(gd->gd_time_seconds + bt->tv_sec); 1243 } 1244 1245 int 1246 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps) 1247 { 1248 pps_params_t *app; 1249 struct pps_fetch_args *fapi; 1250 #ifdef PPS_SYNC 1251 struct pps_kcbind_args *kapi; 1252 #endif 1253 1254 switch (cmd) { 1255 case PPS_IOC_CREATE: 1256 return (0); 1257 case PPS_IOC_DESTROY: 1258 return (0); 1259 case PPS_IOC_SETPARAMS: 1260 app = (pps_params_t *)data; 1261 if (app->mode & ~pps->ppscap) 1262 return (EINVAL); 1263 pps->ppsparam = *app; 1264 return (0); 1265 case PPS_IOC_GETPARAMS: 1266 app = (pps_params_t *)data; 1267 *app = pps->ppsparam; 1268 app->api_version = PPS_API_VERS_1; 1269 return (0); 1270 case PPS_IOC_GETCAP: 1271 *(int*)data = pps->ppscap; 1272 return (0); 1273 case PPS_IOC_FETCH: 1274 fapi = (struct pps_fetch_args *)data; 1275 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC) 1276 return (EINVAL); 1277 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec) 1278 return (EOPNOTSUPP); 1279 pps->ppsinfo.current_mode = pps->ppsparam.mode; 1280 fapi->pps_info_buf = pps->ppsinfo; 1281 return (0); 1282 case PPS_IOC_KCBIND: 1283 #ifdef PPS_SYNC 1284 kapi = (struct pps_kcbind_args *)data; 1285 /* XXX Only root should be able to do this */ 1286 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC) 1287 return (EINVAL); 1288 if (kapi->kernel_consumer != PPS_KC_HARDPPS) 1289 return (EINVAL); 1290 if (kapi->edge & ~pps->ppscap) 1291 return (EINVAL); 1292 pps->kcmode = kapi->edge; 1293 return (0); 1294 #else 1295 return (EOPNOTSUPP); 1296 #endif 1297 default: 1298 return (ENOTTY); 1299 } 1300 } 1301 1302 void 1303 pps_init(struct pps_state *pps) 1304 { 1305 pps->ppscap |= PPS_TSFMT_TSPEC; 1306 if (pps->ppscap & PPS_CAPTUREASSERT) 1307 pps->ppscap |= PPS_OFFSETASSERT; 1308 if (pps->ppscap & PPS_CAPTURECLEAR) 1309 pps->ppscap |= PPS_OFFSETCLEAR; 1310 } 1311 1312 void 1313 pps_event(struct pps_state *pps, sysclock_t count, int event) 1314 { 1315 struct globaldata *gd; 1316 struct timespec *tsp; 1317 struct timespec *osp; 1318 struct timespec *bt; 1319 struct timespec ts; 1320 sysclock_t *pcount; 1321 #ifdef PPS_SYNC 1322 sysclock_t tcount; 1323 #endif 1324 sysclock_t delta; 1325 pps_seq_t *pseq; 1326 int foff; 1327 int fhard; 1328 1329 gd = mycpu; 1330 1331 /* Things would be easier with arrays... */ 1332 if (event == PPS_CAPTUREASSERT) { 1333 tsp = &pps->ppsinfo.assert_timestamp; 1334 osp = &pps->ppsparam.assert_offset; 1335 foff = pps->ppsparam.mode & PPS_OFFSETASSERT; 1336 fhard = pps->kcmode & PPS_CAPTUREASSERT; 1337 pcount = &pps->ppscount[0]; 1338 pseq = &pps->ppsinfo.assert_sequence; 1339 } else { 1340 tsp = &pps->ppsinfo.clear_timestamp; 1341 osp = &pps->ppsparam.clear_offset; 1342 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR; 1343 fhard = pps->kcmode & PPS_CAPTURECLEAR; 1344 pcount = &pps->ppscount[1]; 1345 pseq = &pps->ppsinfo.clear_sequence; 1346 } 1347 1348 /* Nothing really happened */ 1349 if (*pcount == count) 1350 return; 1351 1352 *pcount = count; 1353 1354 do { 1355 ts.tv_sec = gd->gd_time_seconds; 1356 delta = count - gd->gd_cpuclock_base; 1357 } while (ts.tv_sec != gd->gd_time_seconds); 1358 1359 if (delta >= sys_cputimer->freq) { 1360 ts.tv_sec += delta / sys_cputimer->freq; 1361 delta %= sys_cputimer->freq; 1362 } 1363 ts.tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1364 bt = &basetime[basetime_index]; 1365 ts.tv_sec += bt->tv_sec; 1366 ts.tv_nsec += bt->tv_nsec; 1367 while (ts.tv_nsec >= 1000000000) { 1368 ts.tv_nsec -= 1000000000; 1369 ++ts.tv_sec; 1370 } 1371 1372 (*pseq)++; 1373 *tsp = ts; 1374 1375 if (foff) { 1376 timespecadd(tsp, osp); 1377 if (tsp->tv_nsec < 0) { 1378 tsp->tv_nsec += 1000000000; 1379 tsp->tv_sec -= 1; 1380 } 1381 } 1382 #ifdef PPS_SYNC 1383 if (fhard) { 1384 /* magic, at its best... */ 1385 tcount = count - pps->ppscount[2]; 1386 pps->ppscount[2] = count; 1387 if (tcount >= sys_cputimer->freq) { 1388 delta = (1000000000 * (tcount / sys_cputimer->freq) + 1389 sys_cputimer->freq64_nsec * 1390 (tcount % sys_cputimer->freq)) >> 32; 1391 } else { 1392 delta = (sys_cputimer->freq64_nsec * tcount) >> 32; 1393 } 1394 hardpps(tsp, delta); 1395 } 1396 #endif 1397 } 1398 1399 /* 1400 * Return the tsc target value for a delay of (ns). 1401 * 1402 * Returns -1 if the TSC is not supported. 1403 */ 1404 int64_t 1405 tsc_get_target(int ns) 1406 { 1407 #if defined(_RDTSC_SUPPORTED_) 1408 if (cpu_feature & CPUID_TSC) { 1409 return (rdtsc() + tsc_frequency * ns / (int64_t)1000000000); 1410 } 1411 #endif 1412 return(-1); 1413 } 1414 1415 /* 1416 * Compare the tsc against the passed target 1417 * 1418 * Returns +1 if the target has been reached 1419 * Returns 0 if the target has not yet been reached 1420 * Returns -1 if the TSC is not supported. 1421 * 1422 * Typical use: while (tsc_test_target(target) == 0) { ...poll... } 1423 */ 1424 int 1425 tsc_test_target(int64_t target) 1426 { 1427 #if defined(_RDTSC_SUPPORTED_) 1428 if (cpu_feature & CPUID_TSC) { 1429 if ((int64_t)(target - rdtsc()) <= 0) 1430 return(1); 1431 return(0); 1432 } 1433 #endif 1434 return(-1); 1435 } 1436 1437 /* 1438 * Delay the specified number of nanoseconds using the tsc. This function 1439 * returns immediately if the TSC is not supported. At least one cpu_pause() 1440 * will be issued. 1441 */ 1442 void 1443 tsc_delay(int ns) 1444 { 1445 int64_t clk; 1446 1447 clk = tsc_get_target(ns); 1448 cpu_pause(); 1449 while (tsc_test_target(clk) == 0) 1450 cpu_pause(); 1451 } 1452