Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_intr.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> 5 * All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/12.0/sys/kern/kern_intr.c 338324 2018-08-26 12:51:46Z markm $"); 31 32 #include "opt_ddb.h" 33 #include "opt_kstack_usage_prof.h" 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/conf.h> 38 #include <sys/cpuset.h> 39 #include <sys/rtprio.h> 40 #include <sys/systm.h> 41 #include <sys/interrupt.h> 42 #include <sys/kernel.h> 43 #include <sys/kthread.h> 44 #include <sys/ktr.h> 45 #include <sys/limits.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mutex.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/random.h> 52 #include <sys/resourcevar.h> 53 #include <sys/sched.h> 54 #include <sys/smp.h> 55 #include <sys/sysctl.h> 56 #include <sys/syslog.h> 57 #include <sys/unistd.h> 58 #include <sys/vmmeter.h> 59 #include <machine/atomic.h> 60 #include <machine/cpu.h> 61 #include <machine/md_var.h> 62 #include <machine/stdarg.h> 63 #ifdef DDB 64 #include <ddb/ddb.h> 65 #include <ddb/db_sym.h> 66 #endif 67 68 /* 69 * Describe an interrupt thread. There is one of these per interrupt event. 70 */ 71 struct intr_thread { 72 struct intr_event *it_event; 73 struct thread *it_thread; /* Kernel thread. */ 74 int it_flags; /* (j) IT_* flags. */ 75 int it_need; /* Needs service. */ 76 }; 77 78 /* Interrupt thread flags kept in it_flags */ 79 #define IT_DEAD 0x000001 /* Thread is waiting to exit. */ 80 #define IT_WAIT 0x000002 /* Thread is waiting for completion. */ 81 82 struct intr_entropy { 83 struct thread *td; 84 uintptr_t event; 85 }; 86 87 struct intr_event *clk_intr_event; 88 struct intr_event *tty_intr_event; 89 void *vm_ih; 90 struct proc *intrproc; 91 92 static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads"); 93 94 static int intr_storm_threshold = 1000; 95 SYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RWTUN, 96 &intr_storm_threshold, 0, 97 "Number of consecutive interrupts before storm protection is enabled"); 98 static TAILQ_HEAD(, intr_event) event_list = 99 TAILQ_HEAD_INITIALIZER(event_list); 100 static struct mtx event_lock; 101 MTX_SYSINIT(intr_event_list, &event_lock, "intr event list", MTX_DEF); 102 103 static void intr_event_update(struct intr_event *ie); 104 static int intr_event_schedule_thread(struct intr_event *ie); 105 static struct intr_thread *ithread_create(const char *name); 106 static void ithread_destroy(struct intr_thread *ithread); 107 static void ithread_execute_handlers(struct proc *p, 108 struct intr_event *ie); 109 static void ithread_loop(void *); 110 static void ithread_update(struct intr_thread *ithd); 111 static void start_softintr(void *); 112 113 /* Map an interrupt type to an ithread priority. */ 114 u_char 115 intr_priority(enum intr_type flags) 116 { 117 u_char pri; 118 119 flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET | 120 INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV); 121 switch (flags) { 122 case INTR_TYPE_TTY: 123 pri = PI_TTY; 124 break; 125 case INTR_TYPE_BIO: 126 pri = PI_DISK; 127 break; 128 case INTR_TYPE_NET: 129 pri = PI_NET; 130 break; 131 case INTR_TYPE_CAM: 132 pri = PI_DISK; 133 break; 134 case INTR_TYPE_AV: 135 pri = PI_AV; 136 break; 137 case INTR_TYPE_CLK: 138 pri = PI_REALTIME; 139 break; 140 case INTR_TYPE_MISC: 141 pri = PI_DULL; /* don't care */ 142 break; 143 default: 144 /* We didn't specify an interrupt level. */ 145 panic("intr_priority: no interrupt type in flags"); 146 } 147 148 return pri; 149 } 150 151 /* 152 * Update an ithread based on the associated intr_event. 153 */ 154 static void 155 ithread_update(struct intr_thread *ithd) 156 { 157 struct intr_event *ie; 158 struct thread *td; 159 u_char pri; 160 161 ie = ithd->it_event; 162 td = ithd->it_thread; 163 mtx_assert(&ie->ie_lock, MA_OWNED); 164 165 /* Determine the overall priority of this event. */ 166 if (CK_SLIST_EMPTY(&ie->ie_handlers)) 167 pri = PRI_MAX_ITHD; 168 else 169 pri = CK_SLIST_FIRST(&ie->ie_handlers)->ih_pri; 170 171 /* Update name and priority. */ 172 strlcpy(td->td_name, ie->ie_fullname, sizeof(td->td_name)); 173 #ifdef KTR 174 sched_clear_tdname(td); 175 #endif 176 thread_lock(td); 177 sched_prio(td, pri); 178 thread_unlock(td); 179 } 180 181 /* 182 * Regenerate the full name of an interrupt event and update its priority. 183 */ 184 static void 185 intr_event_update(struct intr_event *ie) 186 { 187 struct intr_handler *ih; 188 char *last; 189 int missed, space; 190 191 /* Start off with no entropy and just the name of the event. */ 192 mtx_assert(&ie->ie_lock, MA_OWNED); 193 strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 194 ie->ie_flags &= ~IE_ENTROPY; 195 missed = 0; 196 space = 1; 197 198 /* Run through all the handlers updating values. */ 199 CK_SLIST_FOREACH(ih, &ie->ie_handlers, ih_next) { 200 if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 < 201 sizeof(ie->ie_fullname)) { 202 strcat(ie->ie_fullname, " "); 203 strcat(ie->ie_fullname, ih->ih_name); 204 space = 0; 205 } else 206 missed++; 207 if (ih->ih_flags & IH_ENTROPY) 208 ie->ie_flags |= IE_ENTROPY; 209 } 210 211 /* 212 * If the handler names were too long, add +'s to indicate missing 213 * names. If we run out of room and still have +'s to add, change 214 * the last character from a + to a *. 215 */ 216 last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2]; 217 while (missed-- > 0) { 218 if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) { 219 if (*last == '+') { 220 *last = '*'; 221 break; 222 } else 223 *last = '+'; 224 } else if (space) { 225 strcat(ie->ie_fullname, " +"); 226 space = 0; 227 } else 228 strcat(ie->ie_fullname, "+"); 229 } 230 231 /* 232 * If this event has an ithread, update it's priority and 233 * name. 234 */ 235 if (ie->ie_thread != NULL) 236 ithread_update(ie->ie_thread); 237 CTR2(KTR_INTR, "%s: updated %s", __func__, ie->ie_fullname); 238 } 239 240 int 241 intr_event_create(struct intr_event **event, void *source, int flags, int irq, 242 void (*pre_ithread)(void *), void (*post_ithread)(void *), 243 void (*post_filter)(void *), int (*assign_cpu)(void *, int), 244 const char *fmt, ...) 245 { 246 struct intr_event *ie; 247 va_list ap; 248 249 /* The only valid flag during creation is IE_SOFT. */ 250 if ((flags & ~IE_SOFT) != 0) 251 return (EINVAL); 252 ie = malloc(sizeof(struct intr_event), M_ITHREAD, M_WAITOK | M_ZERO); 253 ie->ie_source = source; 254 ie->ie_pre_ithread = pre_ithread; 255 ie->ie_post_ithread = post_ithread; 256 ie->ie_post_filter = post_filter; 257 ie->ie_assign_cpu = assign_cpu; 258 ie->ie_flags = flags; 259 ie->ie_irq = irq; 260 ie->ie_cpu = NOCPU; 261 CK_SLIST_INIT(&ie->ie_handlers); 262 mtx_init(&ie->ie_lock, "intr event", NULL, MTX_DEF); 263 264 va_start(ap, fmt); 265 vsnprintf(ie->ie_name, sizeof(ie->ie_name), fmt, ap); 266 va_end(ap); 267 strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 268 mtx_lock(&event_lock); 269 TAILQ_INSERT_TAIL(&event_list, ie, ie_list); 270 mtx_unlock(&event_lock); 271 if (event != NULL) 272 *event = ie; 273 CTR2(KTR_INTR, "%s: created %s", __func__, ie->ie_name); 274 return (0); 275 } 276 277 /* 278 * Bind an interrupt event to the specified CPU. Note that not all 279 * platforms support binding an interrupt to a CPU. For those 280 * platforms this request will fail. Using a cpu id of NOCPU unbinds 281 * the interrupt event. 282 */ 283 static int 284 _intr_event_bind(struct intr_event *ie, int cpu, bool bindirq, bool bindithread) 285 { 286 lwpid_t id; 287 int error; 288 289 /* Need a CPU to bind to. */ 290 if (cpu != NOCPU && CPU_ABSENT(cpu)) 291 return (EINVAL); 292 293 if (ie->ie_assign_cpu == NULL) 294 return (EOPNOTSUPP); 295 296 error = priv_check(curthread, PRIV_SCHED_CPUSET_INTR); 297 if (error) 298 return (error); 299 300 /* 301 * If we have any ithreads try to set their mask first to verify 302 * permissions, etc. 303 */ 304 if (bindithread) { 305 mtx_lock(&ie->ie_lock); 306 if (ie->ie_thread != NULL) { 307 id = ie->ie_thread->it_thread->td_tid; 308 mtx_unlock(&ie->ie_lock); 309 error = cpuset_setithread(id, cpu); 310 if (error) 311 return (error); 312 } else 313 mtx_unlock(&ie->ie_lock); 314 } 315 if (bindirq) 316 error = ie->ie_assign_cpu(ie->ie_source, cpu); 317 if (error) { 318 if (bindithread) { 319 mtx_lock(&ie->ie_lock); 320 if (ie->ie_thread != NULL) { 321 cpu = ie->ie_cpu; 322 id = ie->ie_thread->it_thread->td_tid; 323 mtx_unlock(&ie->ie_lock); 324 (void)cpuset_setithread(id, cpu); 325 } else 326 mtx_unlock(&ie->ie_lock); 327 } 328 return (error); 329 } 330 331 if (bindirq) { 332 mtx_lock(&ie->ie_lock); 333 ie->ie_cpu = cpu; 334 mtx_unlock(&ie->ie_lock); 335 } 336 337 return (error); 338 } 339 340 /* 341 * Bind an interrupt event to the specified CPU. For supported platforms, any 342 * associated ithreads as well as the primary interrupt context will be bound 343 * to the specificed CPU. 344 */ 345 int 346 intr_event_bind(struct intr_event *ie, int cpu) 347 { 348 349 return (_intr_event_bind(ie, cpu, true, true)); 350 } 351 352 /* 353 * Bind an interrupt event to the specified CPU, but do not bind associated 354 * ithreads. 355 */ 356 int 357 intr_event_bind_irqonly(struct intr_event *ie, int cpu) 358 { 359 360 return (_intr_event_bind(ie, cpu, true, false)); 361 } 362 363 /* 364 * Bind an interrupt event's ithread to the specified CPU. 365 */ 366 int 367 intr_event_bind_ithread(struct intr_event *ie, int cpu) 368 { 369 370 return (_intr_event_bind(ie, cpu, false, true)); 371 } 372 373 static struct intr_event * 374 intr_lookup(int irq) 375 { 376 struct intr_event *ie; 377 378 mtx_lock(&event_lock); 379 TAILQ_FOREACH(ie, &event_list, ie_list) 380 if (ie->ie_irq == irq && 381 (ie->ie_flags & IE_SOFT) == 0 && 382 CK_SLIST_FIRST(&ie->ie_handlers) != NULL) 383 break; 384 mtx_unlock(&event_lock); 385 return (ie); 386 } 387 388 int 389 intr_setaffinity(int irq, int mode, void *m) 390 { 391 struct intr_event *ie; 392 cpuset_t *mask; 393 int cpu, n; 394 395 mask = m; 396 cpu = NOCPU; 397 /* 398 * If we're setting all cpus we can unbind. Otherwise make sure 399 * only one cpu is in the set. 400 */ 401 if (CPU_CMP(cpuset_root, mask)) { 402 for (n = 0; n < CPU_SETSIZE; n++) { 403 if (!CPU_ISSET(n, mask)) 404 continue; 405 if (cpu != NOCPU) 406 return (EINVAL); 407 cpu = n; 408 } 409 } 410 ie = intr_lookup(irq); 411 if (ie == NULL) 412 return (ESRCH); 413 switch (mode) { 414 case CPU_WHICH_IRQ: 415 return (intr_event_bind(ie, cpu)); 416 case CPU_WHICH_INTRHANDLER: 417 return (intr_event_bind_irqonly(ie, cpu)); 418 case CPU_WHICH_ITHREAD: 419 return (intr_event_bind_ithread(ie, cpu)); 420 default: 421 return (EINVAL); 422 } 423 } 424 425 int 426 intr_getaffinity(int irq, int mode, void *m) 427 { 428 struct intr_event *ie; 429 struct thread *td; 430 struct proc *p; 431 cpuset_t *mask; 432 lwpid_t id; 433 int error; 434 435 mask = m; 436 ie = intr_lookup(irq); 437 if (ie == NULL) 438 return (ESRCH); 439 440 error = 0; 441 CPU_ZERO(mask); 442 switch (mode) { 443 case CPU_WHICH_IRQ: 444 case CPU_WHICH_INTRHANDLER: 445 mtx_lock(&ie->ie_lock); 446 if (ie->ie_cpu == NOCPU) 447 CPU_COPY(cpuset_root, mask); 448 else 449 CPU_SET(ie->ie_cpu, mask); 450 mtx_unlock(&ie->ie_lock); 451 break; 452 case CPU_WHICH_ITHREAD: 453 mtx_lock(&ie->ie_lock); 454 if (ie->ie_thread == NULL) { 455 mtx_unlock(&ie->ie_lock); 456 CPU_COPY(cpuset_root, mask); 457 } else { 458 id = ie->ie_thread->it_thread->td_tid; 459 mtx_unlock(&ie->ie_lock); 460 error = cpuset_which(CPU_WHICH_TID, id, &p, &td, NULL); 461 if (error != 0) 462 return (error); 463 CPU_COPY(&td->td_cpuset->cs_mask, mask); 464 PROC_UNLOCK(p); 465 } 466 default: 467 return (EINVAL); 468 } 469 return (0); 470 } 471 472 int 473 intr_event_destroy(struct intr_event *ie) 474 { 475 476 mtx_lock(&event_lock); 477 mtx_lock(&ie->ie_lock); 478 if (!CK_SLIST_EMPTY(&ie->ie_handlers)) { 479 mtx_unlock(&ie->ie_lock); 480 mtx_unlock(&event_lock); 481 return (EBUSY); 482 } 483 TAILQ_REMOVE(&event_list, ie, ie_list); 484 #ifndef notyet 485 if (ie->ie_thread != NULL) { 486 ithread_destroy(ie->ie_thread); 487 ie->ie_thread = NULL; 488 } 489 #endif 490 mtx_unlock(&ie->ie_lock); 491 mtx_unlock(&event_lock); 492 mtx_destroy(&ie->ie_lock); 493 free(ie, M_ITHREAD); 494 return (0); 495 } 496 497 static struct intr_thread * 498 ithread_create(const char *name) 499 { 500 struct intr_thread *ithd; 501 struct thread *td; 502 int error; 503 504 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); 505 506 error = kproc_kthread_add(ithread_loop, ithd, &intrproc, 507 &td, RFSTOPPED | RFHIGHPID, 508 0, "intr", "%s", name); 509 if (error) 510 panic("kproc_create() failed with %d", error); 511 thread_lock(td); 512 sched_class(td, PRI_ITHD); 513 TD_SET_IWAIT(td); 514 thread_unlock(td); 515 td->td_pflags |= TDP_ITHREAD; 516 ithd->it_thread = td; 517 CTR2(KTR_INTR, "%s: created %s", __func__, name); 518 return (ithd); 519 } 520 521 static void 522 ithread_destroy(struct intr_thread *ithread) 523 { 524 struct thread *td; 525 526 CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name); 527 td = ithread->it_thread; 528 thread_lock(td); 529 ithread->it_flags |= IT_DEAD; 530 if (TD_AWAITING_INTR(td)) { 531 TD_CLR_IWAIT(td); 532 sched_add(td, SRQ_INTR); 533 } 534 thread_unlock(td); 535 } 536 537 int 538 intr_event_add_handler(struct intr_event *ie, const char *name, 539 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri, 540 enum intr_type flags, void **cookiep) 541 { 542 struct intr_handler *ih, *temp_ih; 543 struct intr_handler **prevptr; 544 struct intr_thread *it; 545 546 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL)) 547 return (EINVAL); 548 549 /* Allocate and populate an interrupt handler structure. */ 550 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); 551 ih->ih_filter = filter; 552 ih->ih_handler = handler; 553 ih->ih_argument = arg; 554 strlcpy(ih->ih_name, name, sizeof(ih->ih_name)); 555 ih->ih_event = ie; 556 ih->ih_pri = pri; 557 if (flags & INTR_EXCL) 558 ih->ih_flags = IH_EXCLUSIVE; 559 if (flags & INTR_MPSAFE) 560 ih->ih_flags |= IH_MPSAFE; 561 if (flags & INTR_ENTROPY) 562 ih->ih_flags |= IH_ENTROPY; 563 564 /* We can only have one exclusive handler in a event. */ 565 mtx_lock(&ie->ie_lock); 566 if (!CK_SLIST_EMPTY(&ie->ie_handlers)) { 567 if ((flags & INTR_EXCL) || 568 (CK_SLIST_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { 569 mtx_unlock(&ie->ie_lock); 570 free(ih, M_ITHREAD); 571 return (EINVAL); 572 } 573 } 574 575 /* Create a thread if we need one. */ 576 while (ie->ie_thread == NULL && handler != NULL) { 577 if (ie->ie_flags & IE_ADDING_THREAD) 578 msleep(ie, &ie->ie_lock, 0, "ithread", 0); 579 else { 580 ie->ie_flags |= IE_ADDING_THREAD; 581 mtx_unlock(&ie->ie_lock); 582 it = ithread_create("intr: newborn"); 583 mtx_lock(&ie->ie_lock); 584 ie->ie_flags &= ~IE_ADDING_THREAD; 585 ie->ie_thread = it; 586 it->it_event = ie; 587 ithread_update(it); 588 wakeup(ie); 589 } 590 } 591 592 /* Add the new handler to the event in priority order. */ 593 CK_SLIST_FOREACH_PREVPTR(temp_ih, prevptr, &ie->ie_handlers, ih_next) { 594 if (temp_ih->ih_pri > ih->ih_pri) 595 break; 596 } 597 CK_SLIST_INSERT_PREVPTR(prevptr, temp_ih, ih, ih_next); 598 599 intr_event_update(ie); 600 601 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, 602 ie->ie_name); 603 mtx_unlock(&ie->ie_lock); 604 605 if (cookiep != NULL) 606 *cookiep = ih; 607 return (0); 608 } 609 610 /* 611 * Append a description preceded by a ':' to the name of the specified 612 * interrupt handler. 613 */ 614 int 615 intr_event_describe_handler(struct intr_event *ie, void *cookie, 616 const char *descr) 617 { 618 struct intr_handler *ih; 619 size_t space; 620 char *start; 621 622 mtx_lock(&ie->ie_lock); 623 #ifdef INVARIANTS 624 CK_SLIST_FOREACH(ih, &ie->ie_handlers, ih_next) { 625 if (ih == cookie) 626 break; 627 } 628 if (ih == NULL) { 629 mtx_unlock(&ie->ie_lock); 630 panic("handler %p not found in interrupt event %p", cookie, ie); 631 } 632 #endif 633 ih = cookie; 634 635 /* 636 * Look for an existing description by checking for an 637 * existing ":". This assumes device names do not include 638 * colons. If one is found, prepare to insert the new 639 * description at that point. If one is not found, find the 640 * end of the name to use as the insertion point. 641 */ 642 start = strchr(ih->ih_name, ':'); 643 if (start == NULL) 644 start = strchr(ih->ih_name, 0); 645 646 /* 647 * See if there is enough remaining room in the string for the 648 * description + ":". The "- 1" leaves room for the trailing 649 * '\0'. The "+ 1" accounts for the colon. 650 */ 651 space = sizeof(ih->ih_name) - (start - ih->ih_name) - 1; 652 if (strlen(descr) + 1 > space) { 653 mtx_unlock(&ie->ie_lock); 654 return (ENOSPC); 655 } 656 657 /* Append a colon followed by the description. */ 658 *start = ':'; 659 strcpy(start + 1, descr); 660 intr_event_update(ie); 661 mtx_unlock(&ie->ie_lock); 662 return (0); 663 } 664 665 /* 666 * Return the ie_source field from the intr_event an intr_handler is 667 * associated with. 668 */ 669 void * 670 intr_handler_source(void *cookie) 671 { 672 struct intr_handler *ih; 673 struct intr_event *ie; 674 675 ih = (struct intr_handler *)cookie; 676 if (ih == NULL) 677 return (NULL); 678 ie = ih->ih_event; 679 KASSERT(ie != NULL, 680 ("interrupt handler \"%s\" has a NULL interrupt event", 681 ih->ih_name)); 682 return (ie->ie_source); 683 } 684 685 /* 686 * If intr_event_handle() is running in the ISR context at the time of the call, 687 * then wait for it to complete. 688 */ 689 static void 690 intr_event_barrier(struct intr_event *ie) 691 { 692 int phase; 693 694 mtx_assert(&ie->ie_lock, MA_OWNED); 695 phase = ie->ie_phase; 696 697 /* 698 * Switch phase to direct future interrupts to the other active counter. 699 * Make sure that any preceding stores are visible before the switch. 700 */ 701 KASSERT(ie->ie_active[!phase] == 0, ("idle phase has activity")); 702 atomic_store_rel_int(&ie->ie_phase, !phase); 703 704 /* 705 * This code cooperates with wait-free iteration of ie_handlers 706 * in intr_event_handle. 707 * Make sure that the removal and the phase update are not reordered 708 * with the active count check. 709 * Note that no combination of acquire and release fences can provide 710 * that guarantee as Store->Load sequences can always be reordered. 711 */ 712 atomic_thread_fence_seq_cst(); 713 714 /* 715 * Now wait on the inactive phase. 716 * The acquire fence is needed so that that all post-barrier accesses 717 * are after the check. 718 */ 719 while (ie->ie_active[phase] > 0) 720 cpu_spinwait(); 721 atomic_thread_fence_acq(); 722 } 723 724 /* 725 * Sleep until an ithread finishes executing an interrupt handler. 726 * 727 * XXX Doesn't currently handle interrupt filters or fast interrupt 728 * handlers. This is intended for compatibility with linux drivers 729 * only. Do not use in BSD code. 730 */ 731 void 732 _intr_drain(int irq) 733 { 734 struct intr_event *ie; 735 struct intr_thread *ithd; 736 struct thread *td; 737 738 ie = intr_lookup(irq); 739 if (ie == NULL) 740 return; 741 if (ie->ie_thread == NULL) 742 return; 743 ithd = ie->ie_thread; 744 td = ithd->it_thread; 745 /* 746 * We set the flag and wait for it to be cleared to avoid 747 * long delays with potentially busy interrupt handlers 748 * were we to only sample TD_AWAITING_INTR() every tick. 749 */ 750 thread_lock(td); 751 if (!TD_AWAITING_INTR(td)) { 752 ithd->it_flags |= IT_WAIT; 753 while (ithd->it_flags & IT_WAIT) { 754 thread_unlock(td); 755 pause("idrain", 1); 756 thread_lock(td); 757 } 758 } 759 thread_unlock(td); 760 return; 761 } 762 763 int 764 intr_event_remove_handler(void *cookie) 765 { 766 struct intr_handler *handler = (struct intr_handler *)cookie; 767 struct intr_event *ie; 768 struct intr_handler *ih; 769 struct intr_handler **prevptr; 770 #ifdef notyet 771 int dead; 772 #endif 773 774 if (handler == NULL) 775 return (EINVAL); 776 ie = handler->ih_event; 777 KASSERT(ie != NULL, 778 ("interrupt handler \"%s\" has a NULL interrupt event", 779 handler->ih_name)); 780 781 mtx_lock(&ie->ie_lock); 782 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, 783 ie->ie_name); 784 CK_SLIST_FOREACH_PREVPTR(ih, prevptr, &ie->ie_handlers, ih_next) { 785 if (ih == handler) 786 break; 787 } 788 if (ih == NULL) { 789 panic("interrupt handler \"%s\" not found in " 790 "interrupt event \"%s\"", handler->ih_name, ie->ie_name); 791 } 792 793 /* 794 * If there is no ithread, then directly remove the handler. Note that 795 * intr_event_handle() iterates ie_handlers in a lock-less fashion, so 796 * care needs to be taken to keep ie_handlers consistent and to free 797 * the removed handler only when ie_handlers is quiescent. 798 */ 799 if (ie->ie_thread == NULL) { 800 CK_SLIST_REMOVE_PREVPTR(prevptr, ih, ih_next); 801 intr_event_barrier(ie); 802 intr_event_update(ie); 803 mtx_unlock(&ie->ie_lock); 804 free(handler, M_ITHREAD); 805 return (0); 806 } 807 808 /* 809 * Let the interrupt thread do the job. 810 * The interrupt source is disabled when the interrupt thread is 811 * running, so it does not have to worry about interaction with 812 * intr_event_handle(). 813 */ 814 KASSERT((handler->ih_flags & IH_DEAD) == 0, 815 ("duplicate handle remove")); 816 handler->ih_flags |= IH_DEAD; 817 intr_event_schedule_thread(ie); 818 while (handler->ih_flags & IH_DEAD) 819 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); 820 intr_event_update(ie); 821 822 #ifdef notyet 823 /* 824 * XXX: This could be bad in the case of ppbus(8). Also, I think 825 * this could lead to races of stale data when servicing an 826 * interrupt. 827 */ 828 dead = 1; 829 CK_SLIST_FOREACH(ih, &ie->ie_handlers, ih_next) { 830 if (ih->ih_handler != NULL) { 831 dead = 0; 832 break; 833 } 834 } 835 if (dead) { 836 ithread_destroy(ie->ie_thread); 837 ie->ie_thread = NULL; 838 } 839 #endif 840 mtx_unlock(&ie->ie_lock); 841 free(handler, M_ITHREAD); 842 return (0); 843 } 844 845 static int 846 intr_event_schedule_thread(struct intr_event *ie) 847 { 848 struct intr_entropy entropy; 849 struct intr_thread *it; 850 struct thread *td; 851 struct thread *ctd; 852 853 /* 854 * If no ithread or no handlers, then we have a stray interrupt. 855 */ 856 if (ie == NULL || CK_SLIST_EMPTY(&ie->ie_handlers) || 857 ie->ie_thread == NULL) 858 return (EINVAL); 859 860 ctd = curthread; 861 it = ie->ie_thread; 862 td = it->it_thread; 863 864 /* 865 * If any of the handlers for this ithread claim to be good 866 * sources of entropy, then gather some. 867 */ 868 if (ie->ie_flags & IE_ENTROPY) { 869 entropy.event = (uintptr_t)ie; 870 entropy.td = ctd; 871 random_harvest_queue(&entropy, sizeof(entropy), RANDOM_INTERRUPT); 872 } 873 874 KASSERT(td->td_proc != NULL, ("ithread %s has no process", ie->ie_name)); 875 876 /* 877 * Set it_need to tell the thread to keep running if it is already 878 * running. Then, lock the thread and see if we actually need to 879 * put it on the runqueue. 880 * 881 * Use store_rel to arrange that the store to ih_need in 882 * swi_sched() is before the store to it_need and prepare for 883 * transfer of this order to loads in the ithread. 884 */ 885 atomic_store_rel_int(&it->it_need, 1); 886 thread_lock(td); 887 if (TD_AWAITING_INTR(td)) { 888 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, td->td_proc->p_pid, 889 td->td_name); 890 TD_CLR_IWAIT(td); 891 sched_add(td, SRQ_INTR); 892 } else { 893 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", 894 __func__, td->td_proc->p_pid, td->td_name, it->it_need, td->td_state); 895 } 896 thread_unlock(td); 897 898 return (0); 899 } 900 901 /* 902 * Allow interrupt event binding for software interrupt handlers -- a no-op, 903 * since interrupts are generated in software rather than being directed by 904 * a PIC. 905 */ 906 static int 907 swi_assign_cpu(void *arg, int cpu) 908 { 909 910 return (0); 911 } 912 913 /* 914 * Add a software interrupt handler to a specified event. If a given event 915 * is not specified, then a new event is created. 916 */ 917 int 918 swi_add(struct intr_event **eventp, const char *name, driver_intr_t handler, 919 void *arg, int pri, enum intr_type flags, void **cookiep) 920 { 921 struct intr_event *ie; 922 int error; 923 924 if (flags & INTR_ENTROPY) 925 return (EINVAL); 926 927 ie = (eventp != NULL) ? *eventp : NULL; 928 929 if (ie != NULL) { 930 if (!(ie->ie_flags & IE_SOFT)) 931 return (EINVAL); 932 } else { 933 error = intr_event_create(&ie, NULL, IE_SOFT, 0, 934 NULL, NULL, NULL, swi_assign_cpu, "swi%d:", pri); 935 if (error) 936 return (error); 937 if (eventp != NULL) 938 *eventp = ie; 939 } 940 error = intr_event_add_handler(ie, name, NULL, handler, arg, 941 PI_SWI(pri), flags, cookiep); 942 return (error); 943 } 944 945 /* 946 * Schedule a software interrupt thread. 947 */ 948 void 949 swi_sched(void *cookie, int flags) 950 { 951 struct intr_handler *ih = (struct intr_handler *)cookie; 952 struct intr_event *ie = ih->ih_event; 953 struct intr_entropy entropy; 954 int error __unused; 955 956 CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name, 957 ih->ih_need); 958 959 entropy.event = (uintptr_t)ih; 960 entropy.td = curthread; 961 random_harvest_queue(&entropy, sizeof(entropy), RANDOM_SWI); 962 963 /* 964 * Set ih_need for this handler so that if the ithread is already 965 * running it will execute this handler on the next pass. Otherwise, 966 * it will execute it the next time it runs. 967 */ 968 ih->ih_need = 1; 969 970 if (!(flags & SWI_DELAY)) { 971 VM_CNT_INC(v_soft); 972 error = intr_event_schedule_thread(ie); 973 KASSERT(error == 0, ("stray software interrupt")); 974 } 975 } 976 977 /* 978 * Remove a software interrupt handler. Currently this code does not 979 * remove the associated interrupt event if it becomes empty. Calling code 980 * may do so manually via intr_event_destroy(), but that's not really 981 * an optimal interface. 982 */ 983 int 984 swi_remove(void *cookie) 985 { 986 987 return (intr_event_remove_handler(cookie)); 988 } 989 990 static void 991 intr_event_execute_handlers(struct proc *p, struct intr_event *ie) 992 { 993 struct intr_handler *ih, *ihn, *ihp; 994 995 ihp = NULL; 996 CK_SLIST_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) { 997 /* 998 * If this handler is marked for death, remove it from 999 * the list of handlers and wake up the sleeper. 1000 */ 1001 if (ih->ih_flags & IH_DEAD) { 1002 mtx_lock(&ie->ie_lock); 1003 if (ihp == NULL) 1004 CK_SLIST_REMOVE_HEAD(&ie->ie_handlers, ih_next); 1005 else 1006 CK_SLIST_REMOVE_AFTER(ihp, ih_next); 1007 ih->ih_flags &= ~IH_DEAD; 1008 wakeup(ih); 1009 mtx_unlock(&ie->ie_lock); 1010 continue; 1011 } 1012 1013 /* 1014 * Now that we know that the current element won't be removed 1015 * update the previous element. 1016 */ 1017 ihp = ih; 1018 1019 /* Skip filter only handlers */ 1020 if (ih->ih_handler == NULL) 1021 continue; 1022 1023 /* 1024 * For software interrupt threads, we only execute 1025 * handlers that have their need flag set. Hardware 1026 * interrupt threads always invoke all of their handlers. 1027 * 1028 * ih_need can only be 0 or 1. Failed cmpset below 1029 * means that there is no request to execute handlers, 1030 * so a retry of the cmpset is not needed. 1031 */ 1032 if ((ie->ie_flags & IE_SOFT) != 0 && 1033 atomic_cmpset_int(&ih->ih_need, 1, 0) == 0) 1034 continue; 1035 1036 /* Execute this handler. */ 1037 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", 1038 __func__, p->p_pid, (void *)ih->ih_handler, 1039 ih->ih_argument, ih->ih_name, ih->ih_flags); 1040 1041 if (!(ih->ih_flags & IH_MPSAFE)) 1042 mtx_lock(&Giant); 1043 ih->ih_handler(ih->ih_argument); 1044 if (!(ih->ih_flags & IH_MPSAFE)) 1045 mtx_unlock(&Giant); 1046 } 1047 } 1048 1049 static void 1050 ithread_execute_handlers(struct proc *p, struct intr_event *ie) 1051 { 1052 1053 /* Interrupt handlers should not sleep. */ 1054 if (!(ie->ie_flags & IE_SOFT)) 1055 THREAD_NO_SLEEPING(); 1056 intr_event_execute_handlers(p, ie); 1057 if (!(ie->ie_flags & IE_SOFT)) 1058 THREAD_SLEEPING_OK(); 1059 1060 /* 1061 * Interrupt storm handling: 1062 * 1063 * If this interrupt source is currently storming, then throttle 1064 * it to only fire the handler once per clock tick. 1065 * 1066 * If this interrupt source is not currently storming, but the 1067 * number of back to back interrupts exceeds the storm threshold, 1068 * then enter storming mode. 1069 */ 1070 if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold && 1071 !(ie->ie_flags & IE_SOFT)) { 1072 /* Report the message only once every second. */ 1073 if (ppsratecheck(&ie->ie_warntm, &ie->ie_warncnt, 1)) { 1074 printf( 1075 "interrupt storm detected on \"%s\"; throttling interrupt source\n", 1076 ie->ie_name); 1077 } 1078 pause("istorm", 1); 1079 } else 1080 ie->ie_count++; 1081 1082 /* 1083 * Now that all the handlers have had a chance to run, reenable 1084 * the interrupt source. 1085 */ 1086 if (ie->ie_post_ithread != NULL) 1087 ie->ie_post_ithread(ie->ie_source); 1088 } 1089 1090 /* 1091 * This is the main code for interrupt threads. 1092 */ 1093 static void 1094 ithread_loop(void *arg) 1095 { 1096 struct intr_thread *ithd; 1097 struct intr_event *ie; 1098 struct thread *td; 1099 struct proc *p; 1100 int wake; 1101 1102 td = curthread; 1103 p = td->td_proc; 1104 ithd = (struct intr_thread *)arg; 1105 KASSERT(ithd->it_thread == td, 1106 ("%s: ithread and proc linkage out of sync", __func__)); 1107 ie = ithd->it_event; 1108 ie->ie_count = 0; 1109 wake = 0; 1110 1111 /* 1112 * As long as we have interrupts outstanding, go through the 1113 * list of handlers, giving each one a go at it. 1114 */ 1115 for (;;) { 1116 /* 1117 * If we are an orphaned thread, then just die. 1118 */ 1119 if (ithd->it_flags & IT_DEAD) { 1120 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, 1121 p->p_pid, td->td_name); 1122 free(ithd, M_ITHREAD); 1123 kthread_exit(); 1124 } 1125 1126 /* 1127 * Service interrupts. If another interrupt arrives while 1128 * we are running, it will set it_need to note that we 1129 * should make another pass. 1130 * 1131 * The load_acq part of the following cmpset ensures 1132 * that the load of ih_need in ithread_execute_handlers() 1133 * is ordered after the load of it_need here. 1134 */ 1135 while (atomic_cmpset_acq_int(&ithd->it_need, 1, 0) != 0) 1136 ithread_execute_handlers(p, ie); 1137 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); 1138 mtx_assert(&Giant, MA_NOTOWNED); 1139 1140 /* 1141 * Processed all our interrupts. Now get the sched 1142 * lock. This may take a while and it_need may get 1143 * set again, so we have to check it again. 1144 */ 1145 thread_lock(td); 1146 if (atomic_load_acq_int(&ithd->it_need) == 0 && 1147 (ithd->it_flags & (IT_DEAD | IT_WAIT)) == 0) { 1148 TD_SET_IWAIT(td); 1149 ie->ie_count = 0; 1150 mi_switch(SW_VOL | SWT_IWAIT, NULL); 1151 } 1152 if (ithd->it_flags & IT_WAIT) { 1153 wake = 1; 1154 ithd->it_flags &= ~IT_WAIT; 1155 } 1156 thread_unlock(td); 1157 if (wake) { 1158 wakeup(ithd); 1159 wake = 0; 1160 } 1161 } 1162 } 1163 1164 /* 1165 * Main interrupt handling body. 1166 * 1167 * Input: 1168 * o ie: the event connected to this interrupt. 1169 * o frame: some archs (i.e. i386) pass a frame to some. 1170 * handlers as their main argument. 1171 * Return value: 1172 * o 0: everything ok. 1173 * o EINVAL: stray interrupt. 1174 */ 1175 int 1176 intr_event_handle(struct intr_event *ie, struct trapframe *frame) 1177 { 1178 struct intr_handler *ih; 1179 struct trapframe *oldframe; 1180 struct thread *td; 1181 int ret, thread; 1182 int phase; 1183 1184 td = curthread; 1185 1186 #ifdef KSTACK_USAGE_PROF 1187 intr_prof_stack_use(td, frame); 1188 #endif 1189 1190 /* An interrupt with no event or handlers is a stray interrupt. */ 1191 if (ie == NULL || CK_SLIST_EMPTY(&ie->ie_handlers)) 1192 return (EINVAL); 1193 1194 /* 1195 * Execute fast interrupt handlers directly. 1196 * To support clock handlers, if a handler registers 1197 * with a NULL argument, then we pass it a pointer to 1198 * a trapframe as its argument. 1199 */ 1200 td->td_intr_nesting_level++; 1201 thread = 0; 1202 ret = 0; 1203 critical_enter(); 1204 oldframe = td->td_intr_frame; 1205 td->td_intr_frame = frame; 1206 1207 phase = ie->ie_phase; 1208 atomic_add_int(&ie->ie_active[phase], 1); 1209 1210 /* 1211 * This fence is required to ensure that no later loads are 1212 * re-ordered before the ie_active store. 1213 */ 1214 atomic_thread_fence_seq_cst(); 1215 1216 CK_SLIST_FOREACH(ih, &ie->ie_handlers, ih_next) { 1217 if (ih->ih_filter == NULL) { 1218 thread = 1; 1219 continue; 1220 } 1221 CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__, 1222 ih->ih_filter, ih->ih_argument == NULL ? frame : 1223 ih->ih_argument, ih->ih_name); 1224 if (ih->ih_argument == NULL) 1225 ret = ih->ih_filter(frame); 1226 else 1227 ret = ih->ih_filter(ih->ih_argument); 1228 KASSERT(ret == FILTER_STRAY || 1229 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 && 1230 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0), 1231 ("%s: incorrect return value %#x from %s", __func__, ret, 1232 ih->ih_name)); 1233 1234 /* 1235 * Wrapper handler special handling: 1236 * 1237 * in some particular cases (like pccard and pccbb), 1238 * the _real_ device handler is wrapped in a couple of 1239 * functions - a filter wrapper and an ithread wrapper. 1240 * In this case (and just in this case), the filter wrapper 1241 * could ask the system to schedule the ithread and mask 1242 * the interrupt source if the wrapped handler is composed 1243 * of just an ithread handler. 1244 * 1245 * TODO: write a generic wrapper to avoid people rolling 1246 * their own 1247 */ 1248 if (!thread) { 1249 if (ret == FILTER_SCHEDULE_THREAD) 1250 thread = 1; 1251 } 1252 } 1253 atomic_add_rel_int(&ie->ie_active[phase], -1); 1254 1255 td->td_intr_frame = oldframe; 1256 1257 if (thread) { 1258 if (ie->ie_pre_ithread != NULL) 1259 ie->ie_pre_ithread(ie->ie_source); 1260 } else { 1261 if (ie->ie_post_filter != NULL) 1262 ie->ie_post_filter(ie->ie_source); 1263 } 1264 1265 /* Schedule the ithread if needed. */ 1266 if (thread) { 1267 int error __unused; 1268 1269 error = intr_event_schedule_thread(ie); 1270 KASSERT(error == 0, ("bad stray interrupt")); 1271 } 1272 critical_exit(); 1273 td->td_intr_nesting_level--; 1274 return (0); 1275 } 1276 1277 #ifdef DDB 1278 /* 1279 * Dump details about an interrupt handler 1280 */ 1281 static void 1282 db_dump_intrhand(struct intr_handler *ih) 1283 { 1284 int comma; 1285 1286 db_printf("\t%-10s ", ih->ih_name); 1287 switch (ih->ih_pri) { 1288 case PI_REALTIME: 1289 db_printf("CLK "); 1290 break; 1291 case PI_AV: 1292 db_printf("AV "); 1293 break; 1294 case PI_TTY: 1295 db_printf("TTY "); 1296 break; 1297 case PI_NET: 1298 db_printf("NET "); 1299 break; 1300 case PI_DISK: 1301 db_printf("DISK"); 1302 break; 1303 case PI_DULL: 1304 db_printf("DULL"); 1305 break; 1306 default: 1307 if (ih->ih_pri >= PI_SOFT) 1308 db_printf("SWI "); 1309 else 1310 db_printf("%4u", ih->ih_pri); 1311 break; 1312 } 1313 db_printf(" "); 1314 if (ih->ih_filter != NULL) { 1315 db_printf("[F]"); 1316 db_printsym((uintptr_t)ih->ih_filter, DB_STGY_PROC); 1317 } 1318 if (ih->ih_handler != NULL) { 1319 if (ih->ih_filter != NULL) 1320 db_printf(","); 1321 db_printf("[H]"); 1322 db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC); 1323 } 1324 db_printf("(%p)", ih->ih_argument); 1325 if (ih->ih_need || 1326 (ih->ih_flags & (IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD | 1327 IH_MPSAFE)) != 0) { 1328 db_printf(" {"); 1329 comma = 0; 1330 if (ih->ih_flags & IH_EXCLUSIVE) { 1331 if (comma) 1332 db_printf(", "); 1333 db_printf("EXCL"); 1334 comma = 1; 1335 } 1336 if (ih->ih_flags & IH_ENTROPY) { 1337 if (comma) 1338 db_printf(", "); 1339 db_printf("ENTROPY"); 1340 comma = 1; 1341 } 1342 if (ih->ih_flags & IH_DEAD) { 1343 if (comma) 1344 db_printf(", "); 1345 db_printf("DEAD"); 1346 comma = 1; 1347 } 1348 if (ih->ih_flags & IH_MPSAFE) { 1349 if (comma) 1350 db_printf(", "); 1351 db_printf("MPSAFE"); 1352 comma = 1; 1353 } 1354 if (ih->ih_need) { 1355 if (comma) 1356 db_printf(", "); 1357 db_printf("NEED"); 1358 } 1359 db_printf("}"); 1360 } 1361 db_printf("\n"); 1362 } 1363 1364 /* 1365 * Dump details about a event. 1366 */ 1367 void 1368 db_dump_intr_event(struct intr_event *ie, int handlers) 1369 { 1370 struct intr_handler *ih; 1371 struct intr_thread *it; 1372 int comma; 1373 1374 db_printf("%s ", ie->ie_fullname); 1375 it = ie->ie_thread; 1376 if (it != NULL) 1377 db_printf("(pid %d)", it->it_thread->td_proc->p_pid); 1378 else 1379 db_printf("(no thread)"); 1380 if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 || 1381 (it != NULL && it->it_need)) { 1382 db_printf(" {"); 1383 comma = 0; 1384 if (ie->ie_flags & IE_SOFT) { 1385 db_printf("SOFT"); 1386 comma = 1; 1387 } 1388 if (ie->ie_flags & IE_ENTROPY) { 1389 if (comma) 1390 db_printf(", "); 1391 db_printf("ENTROPY"); 1392 comma = 1; 1393 } 1394 if (ie->ie_flags & IE_ADDING_THREAD) { 1395 if (comma) 1396 db_printf(", "); 1397 db_printf("ADDING_THREAD"); 1398 comma = 1; 1399 } 1400 if (it != NULL && it->it_need) { 1401 if (comma) 1402 db_printf(", "); 1403 db_printf("NEED"); 1404 } 1405 db_printf("}"); 1406 } 1407 db_printf("\n"); 1408 1409 if (handlers) 1410 CK_SLIST_FOREACH(ih, &ie->ie_handlers, ih_next) 1411 db_dump_intrhand(ih); 1412 } 1413 1414 /* 1415 * Dump data about interrupt handlers 1416 */ 1417 DB_SHOW_COMMAND(intr, db_show_intr) 1418 { 1419 struct intr_event *ie; 1420 int all, verbose; 1421 1422 verbose = strchr(modif, 'v') != NULL; 1423 all = strchr(modif, 'a') != NULL; 1424 TAILQ_FOREACH(ie, &event_list, ie_list) { 1425 if (!all && CK_SLIST_EMPTY(&ie->ie_handlers)) 1426 continue; 1427 db_dump_intr_event(ie, verbose); 1428 if (db_pager_quit) 1429 break; 1430 } 1431 } 1432 #endif /* DDB */ 1433 1434 /* 1435 * Start standard software interrupt threads 1436 */ 1437 static void 1438 start_softintr(void *dummy) 1439 { 1440 1441 if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih)) 1442 panic("died while creating vm swi ithread"); 1443 } 1444 SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, 1445 NULL); 1446 1447 /* 1448 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt. 1449 * The data for this machine dependent, and the declarations are in machine 1450 * dependent code. The layout of intrnames and intrcnt however is machine 1451 * independent. 1452 * 1453 * We do not know the length of intrcnt and intrnames at compile time, so 1454 * calculate things at run time. 1455 */ 1456 static int 1457 sysctl_intrnames(SYSCTL_HANDLER_ARGS) 1458 { 1459 return (sysctl_handle_opaque(oidp, intrnames, sintrnames, req)); 1460 } 1461 1462 SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD, 1463 NULL, 0, sysctl_intrnames, "", "Interrupt Names"); 1464 1465 static int 1466 sysctl_intrcnt(SYSCTL_HANDLER_ARGS) 1467 { 1468 #ifdef SCTL_MASK32 1469 uint32_t *intrcnt32; 1470 unsigned i; 1471 int error; 1472 1473 if (req->flags & SCTL_MASK32) { 1474 if (!req->oldptr) 1475 return (sysctl_handle_opaque(oidp, NULL, sintrcnt / 2, req)); 1476 intrcnt32 = malloc(sintrcnt / 2, M_TEMP, M_NOWAIT); 1477 if (intrcnt32 == NULL) 1478 return (ENOMEM); 1479 for (i = 0; i < sintrcnt / sizeof (u_long); i++) 1480 intrcnt32[i] = intrcnt[i]; 1481 error = sysctl_handle_opaque(oidp, intrcnt32, sintrcnt / 2, req); 1482 free(intrcnt32, M_TEMP); 1483 return (error); 1484 } 1485 #endif 1486 return (sysctl_handle_opaque(oidp, intrcnt, sintrcnt, req)); 1487 } 1488 1489 SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD, 1490 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts"); 1491 1492 #ifdef DDB 1493 /* 1494 * DDB command to dump the interrupt statistics. 1495 */ 1496 DB_SHOW_COMMAND(intrcnt, db_show_intrcnt) 1497 { 1498 u_long *i; 1499 char *cp; 1500 u_int j; 1501 1502 cp = intrnames; 1503 j = 0; 1504 for (i = intrcnt; j < (sintrcnt / sizeof(u_long)) && !db_pager_quit; 1505 i++, j++) { 1506 if (*cp == '\0') 1507 break; 1508 if (*i != 0) 1509 db_printf("%s\t%lu\n", cp, *i); 1510 cp += strlen(cp) + 1; 1511 } 1512 } 1513 #endif
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