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 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_ddb.h" 31 #include "opt_kstack_usage_prof.h" 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/cpuset.h> 37 #include <sys/rtprio.h> 38 #include <sys/systm.h> 39 #include <sys/interrupt.h> 40 #include <sys/kernel.h> 41 #include <sys/kthread.h> 42 #include <sys/ktr.h> 43 #include <sys/limits.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mutex.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/random.h> 50 #include <sys/resourcevar.h> 51 #include <sys/sched.h> 52 #include <sys/smp.h> 53 #include <sys/sysctl.h> 54 #include <sys/syslog.h> 55 #include <sys/unistd.h> 56 #include <sys/vmmeter.h> 57 #include <machine/atomic.h> 58 #include <machine/cpu.h> 59 #include <machine/md_var.h> 60 #include <machine/stdarg.h> 61 #ifdef DDB 62 #include <ddb/ddb.h> 63 #include <ddb/db_sym.h> 64 #endif 65 66 /* 67 * Describe an interrupt thread. There is one of these per interrupt event. 68 */ 69 struct intr_thread { 70 struct intr_event *it_event; 71 struct thread *it_thread; /* Kernel thread. */ 72 int it_flags; /* (j) IT_* flags. */ 73 int it_need; /* Needs service. */ 74 }; 75 76 /* Interrupt thread flags kept in it_flags */ 77 #define IT_DEAD 0x000001 /* Thread is waiting to exit. */ 78 #define IT_WAIT 0x000002 /* Thread is waiting for completion. */ 79 80 struct intr_entropy { 81 struct thread *td; 82 uintptr_t event; 83 }; 84 85 struct intr_event *clk_intr_event; 86 struct intr_event *tty_intr_event; 87 void *vm_ih; 88 struct proc *intrproc; 89 90 static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads"); 91 92 static int intr_storm_threshold = 1000; 93 SYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RWTUN, 94 &intr_storm_threshold, 0, 95 "Number of consecutive interrupts before storm protection is enabled"); 96 static TAILQ_HEAD(, intr_event) event_list = 97 TAILQ_HEAD_INITIALIZER(event_list); 98 static struct mtx event_lock; 99 MTX_SYSINIT(intr_event_list, &event_lock, "intr event list", MTX_DEF); 100 101 static void intr_event_update(struct intr_event *ie); 102 #ifdef INTR_FILTER 103 static int intr_event_schedule_thread(struct intr_event *ie, 104 struct intr_thread *ithd); 105 static int intr_filter_loop(struct intr_event *ie, 106 struct trapframe *frame, struct intr_thread **ithd); 107 static struct intr_thread *ithread_create(const char *name, 108 struct intr_handler *ih); 109 #else 110 static int intr_event_schedule_thread(struct intr_event *ie); 111 static struct intr_thread *ithread_create(const char *name); 112 #endif 113 static void ithread_destroy(struct intr_thread *ithread); 114 static void ithread_execute_handlers(struct proc *p, 115 struct intr_event *ie); 116 #ifdef INTR_FILTER 117 static void priv_ithread_execute_handler(struct proc *p, 118 struct intr_handler *ih); 119 #endif 120 static void ithread_loop(void *); 121 static void ithread_update(struct intr_thread *ithd); 122 static void start_softintr(void *); 123 124 /* Map an interrupt type to an ithread priority. */ 125 u_char 126 intr_priority(enum intr_type flags) 127 { 128 u_char pri; 129 130 flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET | 131 INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV); 132 switch (flags) { 133 case INTR_TYPE_TTY: 134 pri = PI_TTY; 135 break; 136 case INTR_TYPE_BIO: 137 pri = PI_DISK; 138 break; 139 case INTR_TYPE_NET: 140 pri = PI_NET; 141 break; 142 case INTR_TYPE_CAM: 143 pri = PI_DISK; 144 break; 145 case INTR_TYPE_AV: 146 pri = PI_AV; 147 break; 148 case INTR_TYPE_CLK: 149 pri = PI_REALTIME; 150 break; 151 case INTR_TYPE_MISC: 152 pri = PI_DULL; /* don't care */ 153 break; 154 default: 155 /* We didn't specify an interrupt level. */ 156 panic("intr_priority: no interrupt type in flags"); 157 } 158 159 return pri; 160 } 161 162 /* 163 * Update an ithread based on the associated intr_event. 164 */ 165 static void 166 ithread_update(struct intr_thread *ithd) 167 { 168 struct intr_event *ie; 169 struct thread *td; 170 u_char pri; 171 172 ie = ithd->it_event; 173 td = ithd->it_thread; 174 175 /* Determine the overall priority of this event. */ 176 if (TAILQ_EMPTY(&ie->ie_handlers)) 177 pri = PRI_MAX_ITHD; 178 else 179 pri = TAILQ_FIRST(&ie->ie_handlers)->ih_pri; 180 181 /* Update name and priority. */ 182 strlcpy(td->td_name, ie->ie_fullname, sizeof(td->td_name)); 183 #ifdef KTR 184 sched_clear_tdname(td); 185 #endif 186 thread_lock(td); 187 sched_prio(td, pri); 188 thread_unlock(td); 189 } 190 191 /* 192 * Regenerate the full name of an interrupt event and update its priority. 193 */ 194 static void 195 intr_event_update(struct intr_event *ie) 196 { 197 struct intr_handler *ih; 198 char *last; 199 int missed, space; 200 201 /* Start off with no entropy and just the name of the event. */ 202 mtx_assert(&ie->ie_lock, MA_OWNED); 203 strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 204 ie->ie_flags &= ~IE_ENTROPY; 205 missed = 0; 206 space = 1; 207 208 /* Run through all the handlers updating values. */ 209 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 210 if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 < 211 sizeof(ie->ie_fullname)) { 212 strcat(ie->ie_fullname, " "); 213 strcat(ie->ie_fullname, ih->ih_name); 214 space = 0; 215 } else 216 missed++; 217 if (ih->ih_flags & IH_ENTROPY) 218 ie->ie_flags |= IE_ENTROPY; 219 } 220 221 /* 222 * If there is only one handler and its name is too long, just copy in 223 * as much of the end of the name (includes the unit number) as will 224 * fit. Otherwise, we have multiple handlers and not all of the names 225 * will fit. Add +'s to indicate missing names. If we run out of room 226 * and still have +'s to add, change the last character from a + to a *. 227 */ 228 if (missed == 1 && space == 1) { 229 ih = TAILQ_FIRST(&ie->ie_handlers); 230 missed = strlen(ie->ie_fullname) + strlen(ih->ih_name) + 2 - 231 sizeof(ie->ie_fullname); 232 strcat(ie->ie_fullname, (missed == 0) ? " " : "-"); 233 strcat(ie->ie_fullname, &ih->ih_name[missed]); 234 missed = 0; 235 } 236 last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2]; 237 while (missed-- > 0) { 238 if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) { 239 if (*last == '+') { 240 *last = '*'; 241 break; 242 } else 243 *last = '+'; 244 } else if (space) { 245 strcat(ie->ie_fullname, " +"); 246 space = 0; 247 } else 248 strcat(ie->ie_fullname, "+"); 249 } 250 251 /* 252 * If this event has an ithread, update it's priority and 253 * name. 254 */ 255 if (ie->ie_thread != NULL) 256 ithread_update(ie->ie_thread); 257 CTR2(KTR_INTR, "%s: updated %s", __func__, ie->ie_fullname); 258 } 259 260 int 261 intr_event_create(struct intr_event **event, void *source, int flags, int irq, 262 void (*pre_ithread)(void *), void (*post_ithread)(void *), 263 void (*post_filter)(void *), int (*assign_cpu)(void *, int), 264 const char *fmt, ...) 265 { 266 struct intr_event *ie; 267 va_list ap; 268 269 /* The only valid flag during creation is IE_SOFT. */ 270 if ((flags & ~IE_SOFT) != 0) 271 return (EINVAL); 272 ie = malloc(sizeof(struct intr_event), M_ITHREAD, M_WAITOK | M_ZERO); 273 ie->ie_source = source; 274 ie->ie_pre_ithread = pre_ithread; 275 ie->ie_post_ithread = post_ithread; 276 ie->ie_post_filter = post_filter; 277 ie->ie_assign_cpu = assign_cpu; 278 ie->ie_flags = flags; 279 ie->ie_irq = irq; 280 ie->ie_cpu = NOCPU; 281 TAILQ_INIT(&ie->ie_handlers); 282 mtx_init(&ie->ie_lock, "intr event", NULL, MTX_DEF); 283 284 va_start(ap, fmt); 285 vsnprintf(ie->ie_name, sizeof(ie->ie_name), fmt, ap); 286 va_end(ap); 287 strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 288 mtx_lock(&event_lock); 289 TAILQ_INSERT_TAIL(&event_list, ie, ie_list); 290 mtx_unlock(&event_lock); 291 if (event != NULL) 292 *event = ie; 293 CTR2(KTR_INTR, "%s: created %s", __func__, ie->ie_name); 294 return (0); 295 } 296 297 /* 298 * Bind an interrupt event to the specified CPU. Note that not all 299 * platforms support binding an interrupt to a CPU. For those 300 * platforms this request will fail. Using a cpu id of NOCPU unbinds 301 * the interrupt event. 302 */ 303 static int 304 _intr_event_bind(struct intr_event *ie, int cpu, bool bindirq, bool bindithread) 305 { 306 lwpid_t id; 307 int error; 308 309 /* Need a CPU to bind to. */ 310 if (cpu != NOCPU && CPU_ABSENT(cpu)) 311 return (EINVAL); 312 313 if (ie->ie_assign_cpu == NULL) 314 return (EOPNOTSUPP); 315 316 error = priv_check(curthread, PRIV_SCHED_CPUSET_INTR); 317 if (error) 318 return (error); 319 320 /* 321 * If we have any ithreads try to set their mask first to verify 322 * permissions, etc. 323 */ 324 if (bindithread) { 325 mtx_lock(&ie->ie_lock); 326 if (ie->ie_thread != NULL) { 327 id = ie->ie_thread->it_thread->td_tid; 328 mtx_unlock(&ie->ie_lock); 329 error = cpuset_setithread(id, cpu); 330 if (error) 331 return (error); 332 } else 333 mtx_unlock(&ie->ie_lock); 334 } 335 if (bindirq) 336 error = ie->ie_assign_cpu(ie->ie_source, cpu); 337 if (error) { 338 if (bindithread) { 339 mtx_lock(&ie->ie_lock); 340 if (ie->ie_thread != NULL) { 341 cpu = ie->ie_cpu; 342 id = ie->ie_thread->it_thread->td_tid; 343 mtx_unlock(&ie->ie_lock); 344 (void)cpuset_setithread(id, cpu); 345 } else 346 mtx_unlock(&ie->ie_lock); 347 } 348 return (error); 349 } 350 351 if (bindirq) { 352 mtx_lock(&ie->ie_lock); 353 ie->ie_cpu = cpu; 354 mtx_unlock(&ie->ie_lock); 355 } 356 357 return (error); 358 } 359 360 /* 361 * Bind an interrupt event to the specified CPU. For supported platforms, any 362 * associated ithreads as well as the primary interrupt context will be bound 363 * to the specificed CPU. 364 */ 365 int 366 intr_event_bind(struct intr_event *ie, int cpu) 367 { 368 369 return (_intr_event_bind(ie, cpu, true, true)); 370 } 371 372 /* 373 * Bind an interrupt event to the specified CPU, but do not bind associated 374 * ithreads. 375 */ 376 int 377 intr_event_bind_irqonly(struct intr_event *ie, int cpu) 378 { 379 380 return (_intr_event_bind(ie, cpu, true, false)); 381 } 382 383 /* 384 * Bind an interrupt event's ithread to the specified CPU. 385 */ 386 int 387 intr_event_bind_ithread(struct intr_event *ie, int cpu) 388 { 389 390 return (_intr_event_bind(ie, cpu, false, true)); 391 } 392 393 static struct intr_event * 394 intr_lookup(int irq) 395 { 396 struct intr_event *ie; 397 398 mtx_lock(&event_lock); 399 TAILQ_FOREACH(ie, &event_list, ie_list) 400 if (ie->ie_irq == irq && 401 (ie->ie_flags & IE_SOFT) == 0 && 402 TAILQ_FIRST(&ie->ie_handlers) != NULL) 403 break; 404 mtx_unlock(&event_lock); 405 return (ie); 406 } 407 408 int 409 intr_setaffinity(int irq, int mode, void *m) 410 { 411 struct intr_event *ie; 412 cpuset_t *mask; 413 int cpu, n; 414 415 mask = m; 416 cpu = NOCPU; 417 /* 418 * If we're setting all cpus we can unbind. Otherwise make sure 419 * only one cpu is in the set. 420 */ 421 if (CPU_CMP(cpuset_root, mask)) { 422 for (n = 0; n < CPU_SETSIZE; n++) { 423 if (!CPU_ISSET(n, mask)) 424 continue; 425 if (cpu != NOCPU) 426 return (EINVAL); 427 cpu = n; 428 } 429 } 430 ie = intr_lookup(irq); 431 if (ie == NULL) 432 return (ESRCH); 433 switch (mode) { 434 case CPU_WHICH_IRQ: 435 return (intr_event_bind(ie, cpu)); 436 case CPU_WHICH_INTRHANDLER: 437 return (intr_event_bind_irqonly(ie, cpu)); 438 case CPU_WHICH_ITHREAD: 439 return (intr_event_bind_ithread(ie, cpu)); 440 default: 441 return (EINVAL); 442 } 443 } 444 445 int 446 intr_getaffinity(int irq, int mode, void *m) 447 { 448 struct intr_event *ie; 449 struct thread *td; 450 struct proc *p; 451 cpuset_t *mask; 452 lwpid_t id; 453 int error; 454 455 mask = m; 456 ie = intr_lookup(irq); 457 if (ie == NULL) 458 return (ESRCH); 459 460 error = 0; 461 CPU_ZERO(mask); 462 switch (mode) { 463 case CPU_WHICH_IRQ: 464 case CPU_WHICH_INTRHANDLER: 465 mtx_lock(&ie->ie_lock); 466 if (ie->ie_cpu == NOCPU) 467 CPU_COPY(cpuset_root, mask); 468 else 469 CPU_SET(ie->ie_cpu, mask); 470 mtx_unlock(&ie->ie_lock); 471 break; 472 case CPU_WHICH_ITHREAD: 473 mtx_lock(&ie->ie_lock); 474 if (ie->ie_thread == NULL) { 475 mtx_unlock(&ie->ie_lock); 476 CPU_COPY(cpuset_root, mask); 477 } else { 478 id = ie->ie_thread->it_thread->td_tid; 479 mtx_unlock(&ie->ie_lock); 480 error = cpuset_which(CPU_WHICH_TID, id, &p, &td, NULL); 481 if (error != 0) 482 return (error); 483 CPU_COPY(&td->td_cpuset->cs_mask, mask); 484 PROC_UNLOCK(p); 485 } 486 default: 487 return (EINVAL); 488 } 489 return (0); 490 } 491 492 int 493 intr_event_destroy(struct intr_event *ie) 494 { 495 496 mtx_lock(&event_lock); 497 mtx_lock(&ie->ie_lock); 498 if (!TAILQ_EMPTY(&ie->ie_handlers)) { 499 mtx_unlock(&ie->ie_lock); 500 mtx_unlock(&event_lock); 501 return (EBUSY); 502 } 503 TAILQ_REMOVE(&event_list, ie, ie_list); 504 #ifndef notyet 505 if (ie->ie_thread != NULL) { 506 ithread_destroy(ie->ie_thread); 507 ie->ie_thread = NULL; 508 } 509 #endif 510 mtx_unlock(&ie->ie_lock); 511 mtx_unlock(&event_lock); 512 mtx_destroy(&ie->ie_lock); 513 free(ie, M_ITHREAD); 514 return (0); 515 } 516 517 #ifndef INTR_FILTER 518 static struct intr_thread * 519 ithread_create(const char *name) 520 { 521 struct intr_thread *ithd; 522 struct thread *td; 523 int error; 524 525 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); 526 527 error = kproc_kthread_add(ithread_loop, ithd, &intrproc, 528 &td, RFSTOPPED | RFHIGHPID, 529 0, "intr", "%s", name); 530 if (error) 531 panic("kproc_create() failed with %d", error); 532 thread_lock(td); 533 sched_class(td, PRI_ITHD); 534 TD_SET_IWAIT(td); 535 thread_unlock(td); 536 td->td_pflags |= TDP_ITHREAD; 537 ithd->it_thread = td; 538 CTR2(KTR_INTR, "%s: created %s", __func__, name); 539 return (ithd); 540 } 541 #else 542 static struct intr_thread * 543 ithread_create(const char *name, struct intr_handler *ih) 544 { 545 struct intr_thread *ithd; 546 struct thread *td; 547 int error; 548 549 ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); 550 551 error = kproc_kthread_add(ithread_loop, ih, &intrproc, 552 &td, RFSTOPPED | RFHIGHPID, 553 0, "intr", "%s", name); 554 if (error) 555 panic("kproc_create() failed with %d", error); 556 thread_lock(td); 557 sched_class(td, PRI_ITHD); 558 TD_SET_IWAIT(td); 559 thread_unlock(td); 560 td->td_pflags |= TDP_ITHREAD; 561 ithd->it_thread = td; 562 CTR2(KTR_INTR, "%s: created %s", __func__, name); 563 return (ithd); 564 } 565 #endif 566 567 static void 568 ithread_destroy(struct intr_thread *ithread) 569 { 570 struct thread *td; 571 572 CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name); 573 td = ithread->it_thread; 574 thread_lock(td); 575 ithread->it_flags |= IT_DEAD; 576 if (TD_AWAITING_INTR(td)) { 577 TD_CLR_IWAIT(td); 578 sched_add(td, SRQ_INTR); 579 } 580 thread_unlock(td); 581 } 582 583 #ifndef INTR_FILTER 584 int 585 intr_event_add_handler(struct intr_event *ie, const char *name, 586 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri, 587 enum intr_type flags, void **cookiep) 588 { 589 struct intr_handler *ih, *temp_ih; 590 struct intr_thread *it; 591 592 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL)) 593 return (EINVAL); 594 595 /* Allocate and populate an interrupt handler structure. */ 596 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); 597 ih->ih_filter = filter; 598 ih->ih_handler = handler; 599 ih->ih_argument = arg; 600 strlcpy(ih->ih_name, name, sizeof(ih->ih_name)); 601 ih->ih_event = ie; 602 ih->ih_pri = pri; 603 if (flags & INTR_EXCL) 604 ih->ih_flags = IH_EXCLUSIVE; 605 if (flags & INTR_MPSAFE) 606 ih->ih_flags |= IH_MPSAFE; 607 if (flags & INTR_ENTROPY) 608 ih->ih_flags |= IH_ENTROPY; 609 610 /* We can only have one exclusive handler in a event. */ 611 mtx_lock(&ie->ie_lock); 612 if (!TAILQ_EMPTY(&ie->ie_handlers)) { 613 if ((flags & INTR_EXCL) || 614 (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { 615 mtx_unlock(&ie->ie_lock); 616 free(ih, M_ITHREAD); 617 return (EINVAL); 618 } 619 } 620 621 /* Create a thread if we need one. */ 622 while (ie->ie_thread == NULL && handler != NULL) { 623 if (ie->ie_flags & IE_ADDING_THREAD) 624 msleep(ie, &ie->ie_lock, 0, "ithread", 0); 625 else { 626 ie->ie_flags |= IE_ADDING_THREAD; 627 mtx_unlock(&ie->ie_lock); 628 it = ithread_create("intr: newborn"); 629 mtx_lock(&ie->ie_lock); 630 ie->ie_flags &= ~IE_ADDING_THREAD; 631 ie->ie_thread = it; 632 it->it_event = ie; 633 ithread_update(it); 634 wakeup(ie); 635 } 636 } 637 638 /* Add the new handler to the event in priority order. */ 639 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { 640 if (temp_ih->ih_pri > ih->ih_pri) 641 break; 642 } 643 if (temp_ih == NULL) 644 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); 645 else 646 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); 647 intr_event_update(ie); 648 649 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, 650 ie->ie_name); 651 mtx_unlock(&ie->ie_lock); 652 653 if (cookiep != NULL) 654 *cookiep = ih; 655 return (0); 656 } 657 #else 658 int 659 intr_event_add_handler(struct intr_event *ie, const char *name, 660 driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri, 661 enum intr_type flags, void **cookiep) 662 { 663 struct intr_handler *ih, *temp_ih; 664 struct intr_thread *it; 665 666 if (ie == NULL || name == NULL || (handler == NULL && filter == NULL)) 667 return (EINVAL); 668 669 /* Allocate and populate an interrupt handler structure. */ 670 ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); 671 ih->ih_filter = filter; 672 ih->ih_handler = handler; 673 ih->ih_argument = arg; 674 strlcpy(ih->ih_name, name, sizeof(ih->ih_name)); 675 ih->ih_event = ie; 676 ih->ih_pri = pri; 677 if (flags & INTR_EXCL) 678 ih->ih_flags = IH_EXCLUSIVE; 679 if (flags & INTR_MPSAFE) 680 ih->ih_flags |= IH_MPSAFE; 681 if (flags & INTR_ENTROPY) 682 ih->ih_flags |= IH_ENTROPY; 683 684 /* We can only have one exclusive handler in a event. */ 685 mtx_lock(&ie->ie_lock); 686 if (!TAILQ_EMPTY(&ie->ie_handlers)) { 687 if ((flags & INTR_EXCL) || 688 (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { 689 mtx_unlock(&ie->ie_lock); 690 free(ih, M_ITHREAD); 691 return (EINVAL); 692 } 693 } 694 695 /* For filtered handlers, create a private ithread to run on. */ 696 if (filter != NULL && handler != NULL) { 697 mtx_unlock(&ie->ie_lock); 698 it = ithread_create("intr: newborn", ih); 699 mtx_lock(&ie->ie_lock); 700 it->it_event = ie; 701 ih->ih_thread = it; 702 ithread_update(it); /* XXX - do we really need this?!?!? */ 703 } else { /* Create the global per-event thread if we need one. */ 704 while (ie->ie_thread == NULL && handler != NULL) { 705 if (ie->ie_flags & IE_ADDING_THREAD) 706 msleep(ie, &ie->ie_lock, 0, "ithread", 0); 707 else { 708 ie->ie_flags |= IE_ADDING_THREAD; 709 mtx_unlock(&ie->ie_lock); 710 it = ithread_create("intr: newborn", ih); 711 mtx_lock(&ie->ie_lock); 712 ie->ie_flags &= ~IE_ADDING_THREAD; 713 ie->ie_thread = it; 714 it->it_event = ie; 715 ithread_update(it); 716 wakeup(ie); 717 } 718 } 719 } 720 721 /* Add the new handler to the event in priority order. */ 722 TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { 723 if (temp_ih->ih_pri > ih->ih_pri) 724 break; 725 } 726 if (temp_ih == NULL) 727 TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); 728 else 729 TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); 730 intr_event_update(ie); 731 732 CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, 733 ie->ie_name); 734 mtx_unlock(&ie->ie_lock); 735 736 if (cookiep != NULL) 737 *cookiep = ih; 738 return (0); 739 } 740 #endif 741 742 /* 743 * Append a description preceded by a ':' to the name of the specified 744 * interrupt handler. 745 */ 746 int 747 intr_event_describe_handler(struct intr_event *ie, void *cookie, 748 const char *descr) 749 { 750 struct intr_handler *ih; 751 size_t space; 752 char *start; 753 754 mtx_lock(&ie->ie_lock); 755 #ifdef INVARIANTS 756 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 757 if (ih == cookie) 758 break; 759 } 760 if (ih == NULL) { 761 mtx_unlock(&ie->ie_lock); 762 panic("handler %p not found in interrupt event %p", cookie, ie); 763 } 764 #endif 765 ih = cookie; 766 767 /* 768 * Look for an existing description by checking for an 769 * existing ":". This assumes device names do not include 770 * colons. If one is found, prepare to insert the new 771 * description at that point. If one is not found, find the 772 * end of the name to use as the insertion point. 773 */ 774 start = strchr(ih->ih_name, ':'); 775 if (start == NULL) 776 start = strchr(ih->ih_name, 0); 777 778 /* 779 * See if there is enough remaining room in the string for the 780 * description + ":". The "- 1" leaves room for the trailing 781 * '\0'. The "+ 1" accounts for the colon. 782 */ 783 space = sizeof(ih->ih_name) - (start - ih->ih_name) - 1; 784 if (strlen(descr) + 1 > space) { 785 mtx_unlock(&ie->ie_lock); 786 return (ENOSPC); 787 } 788 789 /* Append a colon followed by the description. */ 790 *start = ':'; 791 strcpy(start + 1, descr); 792 intr_event_update(ie); 793 mtx_unlock(&ie->ie_lock); 794 return (0); 795 } 796 797 /* 798 * Return the ie_source field from the intr_event an intr_handler is 799 * associated with. 800 */ 801 void * 802 intr_handler_source(void *cookie) 803 { 804 struct intr_handler *ih; 805 struct intr_event *ie; 806 807 ih = (struct intr_handler *)cookie; 808 if (ih == NULL) 809 return (NULL); 810 ie = ih->ih_event; 811 KASSERT(ie != NULL, 812 ("interrupt handler \"%s\" has a NULL interrupt event", 813 ih->ih_name)); 814 return (ie->ie_source); 815 } 816 817 /* 818 * Sleep until an ithread finishes executing an interrupt handler. 819 * 820 * XXX Doesn't currently handle interrupt filters or fast interrupt 821 * handlers. This is intended for compatibility with linux drivers 822 * only. Do not use in BSD code. 823 */ 824 void 825 _intr_drain(int irq) 826 { 827 struct intr_event *ie; 828 struct intr_thread *ithd; 829 struct thread *td; 830 831 ie = intr_lookup(irq); 832 if (ie == NULL) 833 return; 834 if (ie->ie_thread == NULL) 835 return; 836 ithd = ie->ie_thread; 837 td = ithd->it_thread; 838 /* 839 * We set the flag and wait for it to be cleared to avoid 840 * long delays with potentially busy interrupt handlers 841 * were we to only sample TD_AWAITING_INTR() every tick. 842 */ 843 thread_lock(td); 844 if (!TD_AWAITING_INTR(td)) { 845 ithd->it_flags |= IT_WAIT; 846 while (ithd->it_flags & IT_WAIT) { 847 thread_unlock(td); 848 pause("idrain", 1); 849 thread_lock(td); 850 } 851 } 852 thread_unlock(td); 853 return; 854 } 855 856 857 #ifndef INTR_FILTER 858 int 859 intr_event_remove_handler(void *cookie) 860 { 861 struct intr_handler *handler = (struct intr_handler *)cookie; 862 struct intr_event *ie; 863 #ifdef INVARIANTS 864 struct intr_handler *ih; 865 #endif 866 #ifdef notyet 867 int dead; 868 #endif 869 870 if (handler == NULL) 871 return (EINVAL); 872 ie = handler->ih_event; 873 KASSERT(ie != NULL, 874 ("interrupt handler \"%s\" has a NULL interrupt event", 875 handler->ih_name)); 876 mtx_lock(&ie->ie_lock); 877 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, 878 ie->ie_name); 879 #ifdef INVARIANTS 880 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 881 if (ih == handler) 882 goto ok; 883 mtx_unlock(&ie->ie_lock); 884 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", 885 ih->ih_name, ie->ie_name); 886 ok: 887 #endif 888 /* 889 * If there is no ithread, then just remove the handler and return. 890 * XXX: Note that an INTR_FAST handler might be running on another 891 * CPU! 892 */ 893 if (ie->ie_thread == NULL) { 894 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 895 mtx_unlock(&ie->ie_lock); 896 free(handler, M_ITHREAD); 897 return (0); 898 } 899 900 /* 901 * If the interrupt thread is already running, then just mark this 902 * handler as being dead and let the ithread do the actual removal. 903 * 904 * During a cold boot while cold is set, msleep() does not sleep, 905 * so we have to remove the handler here rather than letting the 906 * thread do it. 907 */ 908 thread_lock(ie->ie_thread->it_thread); 909 if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) { 910 handler->ih_flags |= IH_DEAD; 911 912 /* 913 * Ensure that the thread will process the handler list 914 * again and remove this handler if it has already passed 915 * it on the list. 916 * 917 * The release part of the following store ensures 918 * that the update of ih_flags is ordered before the 919 * it_need setting. See the comment before 920 * atomic_cmpset_acq(&ithd->it_need, ...) operation in 921 * the ithread_execute_handlers(). 922 */ 923 atomic_store_rel_int(&ie->ie_thread->it_need, 1); 924 } else 925 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 926 thread_unlock(ie->ie_thread->it_thread); 927 while (handler->ih_flags & IH_DEAD) 928 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); 929 intr_event_update(ie); 930 #ifdef notyet 931 /* 932 * XXX: This could be bad in the case of ppbus(8). Also, I think 933 * this could lead to races of stale data when servicing an 934 * interrupt. 935 */ 936 dead = 1; 937 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 938 if (!(ih->ih_flags & IH_FAST)) { 939 dead = 0; 940 break; 941 } 942 } 943 if (dead) { 944 ithread_destroy(ie->ie_thread); 945 ie->ie_thread = NULL; 946 } 947 #endif 948 mtx_unlock(&ie->ie_lock); 949 free(handler, M_ITHREAD); 950 return (0); 951 } 952 953 static int 954 intr_event_schedule_thread(struct intr_event *ie) 955 { 956 struct intr_entropy entropy; 957 struct intr_thread *it; 958 struct thread *td; 959 struct thread *ctd; 960 struct proc *p; 961 962 /* 963 * If no ithread or no handlers, then we have a stray interrupt. 964 */ 965 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || 966 ie->ie_thread == NULL) 967 return (EINVAL); 968 969 ctd = curthread; 970 it = ie->ie_thread; 971 td = it->it_thread; 972 p = td->td_proc; 973 974 /* 975 * If any of the handlers for this ithread claim to be good 976 * sources of entropy, then gather some. 977 */ 978 if (ie->ie_flags & IE_ENTROPY) { 979 entropy.event = (uintptr_t)ie; 980 entropy.td = ctd; 981 random_harvest_queue(&entropy, sizeof(entropy), 2, RANDOM_INTERRUPT); 982 } 983 984 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); 985 986 /* 987 * Set it_need to tell the thread to keep running if it is already 988 * running. Then, lock the thread and see if we actually need to 989 * put it on the runqueue. 990 * 991 * Use store_rel to arrange that the store to ih_need in 992 * swi_sched() is before the store to it_need and prepare for 993 * transfer of this order to loads in the ithread. 994 */ 995 atomic_store_rel_int(&it->it_need, 1); 996 thread_lock(td); 997 if (TD_AWAITING_INTR(td)) { 998 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, 999 td->td_name); 1000 TD_CLR_IWAIT(td); 1001 sched_add(td, SRQ_INTR); 1002 } else { 1003 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", 1004 __func__, p->p_pid, td->td_name, it->it_need, td->td_state); 1005 } 1006 thread_unlock(td); 1007 1008 return (0); 1009 } 1010 #else 1011 int 1012 intr_event_remove_handler(void *cookie) 1013 { 1014 struct intr_handler *handler = (struct intr_handler *)cookie; 1015 struct intr_event *ie; 1016 struct intr_thread *it; 1017 #ifdef INVARIANTS 1018 struct intr_handler *ih; 1019 #endif 1020 #ifdef notyet 1021 int dead; 1022 #endif 1023 1024 if (handler == NULL) 1025 return (EINVAL); 1026 ie = handler->ih_event; 1027 KASSERT(ie != NULL, 1028 ("interrupt handler \"%s\" has a NULL interrupt event", 1029 handler->ih_name)); 1030 mtx_lock(&ie->ie_lock); 1031 CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, 1032 ie->ie_name); 1033 #ifdef INVARIANTS 1034 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 1035 if (ih == handler) 1036 goto ok; 1037 mtx_unlock(&ie->ie_lock); 1038 panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", 1039 ih->ih_name, ie->ie_name); 1040 ok: 1041 #endif 1042 /* 1043 * If there are no ithreads (per event and per handler), then 1044 * just remove the handler and return. 1045 * XXX: Note that an INTR_FAST handler might be running on another CPU! 1046 */ 1047 if (ie->ie_thread == NULL && handler->ih_thread == NULL) { 1048 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 1049 mtx_unlock(&ie->ie_lock); 1050 free(handler, M_ITHREAD); 1051 return (0); 1052 } 1053 1054 /* Private or global ithread? */ 1055 it = (handler->ih_thread) ? handler->ih_thread : ie->ie_thread; 1056 /* 1057 * If the interrupt thread is already running, then just mark this 1058 * handler as being dead and let the ithread do the actual removal. 1059 * 1060 * During a cold boot while cold is set, msleep() does not sleep, 1061 * so we have to remove the handler here rather than letting the 1062 * thread do it. 1063 */ 1064 thread_lock(it->it_thread); 1065 if (!TD_AWAITING_INTR(it->it_thread) && !cold) { 1066 handler->ih_flags |= IH_DEAD; 1067 1068 /* 1069 * Ensure that the thread will process the handler list 1070 * again and remove this handler if it has already passed 1071 * it on the list. 1072 * 1073 * The release part of the following store ensures 1074 * that the update of ih_flags is ordered before the 1075 * it_need setting. See the comment before 1076 * atomic_cmpset_acq(&ithd->it_need, ...) operation in 1077 * the ithread_execute_handlers(). 1078 */ 1079 atomic_store_rel_int(&it->it_need, 1); 1080 } else 1081 TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 1082 thread_unlock(it->it_thread); 1083 while (handler->ih_flags & IH_DEAD) 1084 msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); 1085 /* 1086 * At this point, the handler has been disconnected from the event, 1087 * so we can kill the private ithread if any. 1088 */ 1089 if (handler->ih_thread) { 1090 ithread_destroy(handler->ih_thread); 1091 handler->ih_thread = NULL; 1092 } 1093 intr_event_update(ie); 1094 #ifdef notyet 1095 /* 1096 * XXX: This could be bad in the case of ppbus(8). Also, I think 1097 * this could lead to races of stale data when servicing an 1098 * interrupt. 1099 */ 1100 dead = 1; 1101 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 1102 if (handler != NULL) { 1103 dead = 0; 1104 break; 1105 } 1106 } 1107 if (dead) { 1108 ithread_destroy(ie->ie_thread); 1109 ie->ie_thread = NULL; 1110 } 1111 #endif 1112 mtx_unlock(&ie->ie_lock); 1113 free(handler, M_ITHREAD); 1114 return (0); 1115 } 1116 1117 static int 1118 intr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it) 1119 { 1120 struct intr_entropy entropy; 1121 struct thread *td; 1122 struct thread *ctd; 1123 struct proc *p; 1124 1125 /* 1126 * If no ithread or no handlers, then we have a stray interrupt. 1127 */ 1128 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || it == NULL) 1129 return (EINVAL); 1130 1131 ctd = curthread; 1132 td = it->it_thread; 1133 p = td->td_proc; 1134 1135 /* 1136 * If any of the handlers for this ithread claim to be good 1137 * sources of entropy, then gather some. 1138 */ 1139 if (ie->ie_flags & IE_ENTROPY) { 1140 entropy.event = (uintptr_t)ie; 1141 entropy.td = ctd; 1142 random_harvest_queue(&entropy, sizeof(entropy), 2, RANDOM_INTERRUPT); 1143 } 1144 1145 KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); 1146 1147 /* 1148 * Set it_need to tell the thread to keep running if it is already 1149 * running. Then, lock the thread and see if we actually need to 1150 * put it on the runqueue. 1151 * 1152 * Use store_rel to arrange that the store to ih_need in 1153 * swi_sched() is before the store to it_need and prepare for 1154 * transfer of this order to loads in the ithread. 1155 */ 1156 atomic_store_rel_int(&it->it_need, 1); 1157 thread_lock(td); 1158 if (TD_AWAITING_INTR(td)) { 1159 CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, 1160 td->td_name); 1161 TD_CLR_IWAIT(td); 1162 sched_add(td, SRQ_INTR); 1163 } else { 1164 CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", 1165 __func__, p->p_pid, td->td_name, it->it_need, td->td_state); 1166 } 1167 thread_unlock(td); 1168 1169 return (0); 1170 } 1171 #endif 1172 1173 /* 1174 * Allow interrupt event binding for software interrupt handlers -- a no-op, 1175 * since interrupts are generated in software rather than being directed by 1176 * a PIC. 1177 */ 1178 static int 1179 swi_assign_cpu(void *arg, int cpu) 1180 { 1181 1182 return (0); 1183 } 1184 1185 /* 1186 * Add a software interrupt handler to a specified event. If a given event 1187 * is not specified, then a new event is created. 1188 */ 1189 int 1190 swi_add(struct intr_event **eventp, const char *name, driver_intr_t handler, 1191 void *arg, int pri, enum intr_type flags, void **cookiep) 1192 { 1193 struct intr_event *ie; 1194 int error; 1195 1196 if (flags & INTR_ENTROPY) 1197 return (EINVAL); 1198 1199 ie = (eventp != NULL) ? *eventp : NULL; 1200 1201 if (ie != NULL) { 1202 if (!(ie->ie_flags & IE_SOFT)) 1203 return (EINVAL); 1204 } else { 1205 error = intr_event_create(&ie, NULL, IE_SOFT, 0, 1206 NULL, NULL, NULL, swi_assign_cpu, "swi%d:", pri); 1207 if (error) 1208 return (error); 1209 if (eventp != NULL) 1210 *eventp = ie; 1211 } 1212 error = intr_event_add_handler(ie, name, NULL, handler, arg, 1213 PI_SWI(pri), flags, cookiep); 1214 return (error); 1215 } 1216 1217 /* 1218 * Schedule a software interrupt thread. 1219 */ 1220 void 1221 swi_sched(void *cookie, int flags) 1222 { 1223 struct intr_handler *ih = (struct intr_handler *)cookie; 1224 struct intr_event *ie = ih->ih_event; 1225 struct intr_entropy entropy; 1226 int error; 1227 1228 CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name, 1229 ih->ih_need); 1230 1231 entropy.event = (uintptr_t)ih; 1232 entropy.td = curthread; 1233 random_harvest_queue(&entropy, sizeof(entropy), 1, RANDOM_SWI); 1234 1235 /* 1236 * Set ih_need for this handler so that if the ithread is already 1237 * running it will execute this handler on the next pass. Otherwise, 1238 * it will execute it the next time it runs. 1239 */ 1240 ih->ih_need = 1; 1241 1242 if (!(flags & SWI_DELAY)) { 1243 PCPU_INC(cnt.v_soft); 1244 #ifdef INTR_FILTER 1245 error = intr_event_schedule_thread(ie, ie->ie_thread); 1246 #else 1247 error = intr_event_schedule_thread(ie); 1248 #endif 1249 KASSERT(error == 0, ("stray software interrupt")); 1250 } 1251 } 1252 1253 /* 1254 * Remove a software interrupt handler. Currently this code does not 1255 * remove the associated interrupt event if it becomes empty. Calling code 1256 * may do so manually via intr_event_destroy(), but that's not really 1257 * an optimal interface. 1258 */ 1259 int 1260 swi_remove(void *cookie) 1261 { 1262 1263 return (intr_event_remove_handler(cookie)); 1264 } 1265 1266 #ifdef INTR_FILTER 1267 static void 1268 priv_ithread_execute_handler(struct proc *p, struct intr_handler *ih) 1269 { 1270 struct intr_event *ie; 1271 1272 ie = ih->ih_event; 1273 /* 1274 * If this handler is marked for death, remove it from 1275 * the list of handlers and wake up the sleeper. 1276 */ 1277 if (ih->ih_flags & IH_DEAD) { 1278 mtx_lock(&ie->ie_lock); 1279 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); 1280 ih->ih_flags &= ~IH_DEAD; 1281 wakeup(ih); 1282 mtx_unlock(&ie->ie_lock); 1283 return; 1284 } 1285 1286 /* Execute this handler. */ 1287 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", 1288 __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument, 1289 ih->ih_name, ih->ih_flags); 1290 1291 if (!(ih->ih_flags & IH_MPSAFE)) 1292 mtx_lock(&Giant); 1293 ih->ih_handler(ih->ih_argument); 1294 if (!(ih->ih_flags & IH_MPSAFE)) 1295 mtx_unlock(&Giant); 1296 } 1297 #endif 1298 1299 /* 1300 * This is a public function for use by drivers that mux interrupt 1301 * handlers for child devices from their interrupt handler. 1302 */ 1303 void 1304 intr_event_execute_handlers(struct proc *p, struct intr_event *ie) 1305 { 1306 struct intr_handler *ih, *ihn; 1307 1308 TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) { 1309 /* 1310 * If this handler is marked for death, remove it from 1311 * the list of handlers and wake up the sleeper. 1312 */ 1313 if (ih->ih_flags & IH_DEAD) { 1314 mtx_lock(&ie->ie_lock); 1315 TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); 1316 ih->ih_flags &= ~IH_DEAD; 1317 wakeup(ih); 1318 mtx_unlock(&ie->ie_lock); 1319 continue; 1320 } 1321 1322 /* Skip filter only handlers */ 1323 if (ih->ih_handler == NULL) 1324 continue; 1325 1326 /* 1327 * For software interrupt threads, we only execute 1328 * handlers that have their need flag set. Hardware 1329 * interrupt threads always invoke all of their handlers. 1330 * 1331 * ih_need can only be 0 or 1. Failed cmpset below 1332 * means that there is no request to execute handlers, 1333 * so a retry of the cmpset is not needed. 1334 */ 1335 if ((ie->ie_flags & IE_SOFT) != 0 && 1336 atomic_cmpset_int(&ih->ih_need, 1, 0) == 0) 1337 continue; 1338 1339 /* Execute this handler. */ 1340 CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", 1341 __func__, p->p_pid, (void *)ih->ih_handler, 1342 ih->ih_argument, ih->ih_name, ih->ih_flags); 1343 1344 if (!(ih->ih_flags & IH_MPSAFE)) 1345 mtx_lock(&Giant); 1346 ih->ih_handler(ih->ih_argument); 1347 if (!(ih->ih_flags & IH_MPSAFE)) 1348 mtx_unlock(&Giant); 1349 } 1350 } 1351 1352 static void 1353 ithread_execute_handlers(struct proc *p, struct intr_event *ie) 1354 { 1355 1356 /* Interrupt handlers should not sleep. */ 1357 if (!(ie->ie_flags & IE_SOFT)) 1358 THREAD_NO_SLEEPING(); 1359 intr_event_execute_handlers(p, ie); 1360 if (!(ie->ie_flags & IE_SOFT)) 1361 THREAD_SLEEPING_OK(); 1362 1363 /* 1364 * Interrupt storm handling: 1365 * 1366 * If this interrupt source is currently storming, then throttle 1367 * it to only fire the handler once per clock tick. 1368 * 1369 * If this interrupt source is not currently storming, but the 1370 * number of back to back interrupts exceeds the storm threshold, 1371 * then enter storming mode. 1372 */ 1373 if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold && 1374 !(ie->ie_flags & IE_SOFT)) { 1375 /* Report the message only once every second. */ 1376 if (ppsratecheck(&ie->ie_warntm, &ie->ie_warncnt, 1)) { 1377 printf( 1378 "interrupt storm detected on \"%s\"; throttling interrupt source\n", 1379 ie->ie_name); 1380 } 1381 pause("istorm", 1); 1382 } else 1383 ie->ie_count++; 1384 1385 /* 1386 * Now that all the handlers have had a chance to run, reenable 1387 * the interrupt source. 1388 */ 1389 if (ie->ie_post_ithread != NULL) 1390 ie->ie_post_ithread(ie->ie_source); 1391 } 1392 1393 #ifndef INTR_FILTER 1394 /* 1395 * This is the main code for interrupt threads. 1396 */ 1397 static void 1398 ithread_loop(void *arg) 1399 { 1400 struct intr_thread *ithd; 1401 struct intr_event *ie; 1402 struct thread *td; 1403 struct proc *p; 1404 int wake; 1405 1406 td = curthread; 1407 p = td->td_proc; 1408 ithd = (struct intr_thread *)arg; 1409 KASSERT(ithd->it_thread == td, 1410 ("%s: ithread and proc linkage out of sync", __func__)); 1411 ie = ithd->it_event; 1412 ie->ie_count = 0; 1413 wake = 0; 1414 1415 /* 1416 * As long as we have interrupts outstanding, go through the 1417 * list of handlers, giving each one a go at it. 1418 */ 1419 for (;;) { 1420 /* 1421 * If we are an orphaned thread, then just die. 1422 */ 1423 if (ithd->it_flags & IT_DEAD) { 1424 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, 1425 p->p_pid, td->td_name); 1426 free(ithd, M_ITHREAD); 1427 kthread_exit(); 1428 } 1429 1430 /* 1431 * Service interrupts. If another interrupt arrives while 1432 * we are running, it will set it_need to note that we 1433 * should make another pass. 1434 * 1435 * The load_acq part of the following cmpset ensures 1436 * that the load of ih_need in ithread_execute_handlers() 1437 * is ordered after the load of it_need here. 1438 */ 1439 while (atomic_cmpset_acq_int(&ithd->it_need, 1, 0) != 0) 1440 ithread_execute_handlers(p, ie); 1441 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); 1442 mtx_assert(&Giant, MA_NOTOWNED); 1443 1444 /* 1445 * Processed all our interrupts. Now get the sched 1446 * lock. This may take a while and it_need may get 1447 * set again, so we have to check it again. 1448 */ 1449 thread_lock(td); 1450 if (atomic_load_acq_int(&ithd->it_need) == 0 && 1451 (ithd->it_flags & (IT_DEAD | IT_WAIT)) == 0) { 1452 TD_SET_IWAIT(td); 1453 ie->ie_count = 0; 1454 mi_switch(SW_VOL | SWT_IWAIT, NULL); 1455 } 1456 if (ithd->it_flags & IT_WAIT) { 1457 wake = 1; 1458 ithd->it_flags &= ~IT_WAIT; 1459 } 1460 thread_unlock(td); 1461 if (wake) { 1462 wakeup(ithd); 1463 wake = 0; 1464 } 1465 } 1466 } 1467 1468 /* 1469 * Main interrupt handling body. 1470 * 1471 * Input: 1472 * o ie: the event connected to this interrupt. 1473 * o frame: some archs (i.e. i386) pass a frame to some. 1474 * handlers as their main argument. 1475 * Return value: 1476 * o 0: everything ok. 1477 * o EINVAL: stray interrupt. 1478 */ 1479 int 1480 intr_event_handle(struct intr_event *ie, struct trapframe *frame) 1481 { 1482 struct intr_handler *ih; 1483 struct trapframe *oldframe; 1484 struct thread *td; 1485 int error, ret, thread; 1486 1487 td = curthread; 1488 1489 #ifdef KSTACK_USAGE_PROF 1490 intr_prof_stack_use(td, frame); 1491 #endif 1492 1493 /* An interrupt with no event or handlers is a stray interrupt. */ 1494 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers)) 1495 return (EINVAL); 1496 1497 /* 1498 * Execute fast interrupt handlers directly. 1499 * To support clock handlers, if a handler registers 1500 * with a NULL argument, then we pass it a pointer to 1501 * a trapframe as its argument. 1502 */ 1503 td->td_intr_nesting_level++; 1504 thread = 0; 1505 ret = 0; 1506 critical_enter(); 1507 oldframe = td->td_intr_frame; 1508 td->td_intr_frame = frame; 1509 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 1510 if (ih->ih_filter == NULL) { 1511 thread = 1; 1512 continue; 1513 } 1514 CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__, 1515 ih->ih_filter, ih->ih_argument == NULL ? frame : 1516 ih->ih_argument, ih->ih_name); 1517 if (ih->ih_argument == NULL) 1518 ret = ih->ih_filter(frame); 1519 else 1520 ret = ih->ih_filter(ih->ih_argument); 1521 KASSERT(ret == FILTER_STRAY || 1522 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 && 1523 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0), 1524 ("%s: incorrect return value %#x from %s", __func__, ret, 1525 ih->ih_name)); 1526 1527 /* 1528 * Wrapper handler special handling: 1529 * 1530 * in some particular cases (like pccard and pccbb), 1531 * the _real_ device handler is wrapped in a couple of 1532 * functions - a filter wrapper and an ithread wrapper. 1533 * In this case (and just in this case), the filter wrapper 1534 * could ask the system to schedule the ithread and mask 1535 * the interrupt source if the wrapped handler is composed 1536 * of just an ithread handler. 1537 * 1538 * TODO: write a generic wrapper to avoid people rolling 1539 * their own 1540 */ 1541 if (!thread) { 1542 if (ret == FILTER_SCHEDULE_THREAD) 1543 thread = 1; 1544 } 1545 } 1546 td->td_intr_frame = oldframe; 1547 1548 if (thread) { 1549 if (ie->ie_pre_ithread != NULL) 1550 ie->ie_pre_ithread(ie->ie_source); 1551 } else { 1552 if (ie->ie_post_filter != NULL) 1553 ie->ie_post_filter(ie->ie_source); 1554 } 1555 1556 /* Schedule the ithread if needed. */ 1557 if (thread) { 1558 error = intr_event_schedule_thread(ie); 1559 KASSERT(error == 0, ("bad stray interrupt")); 1560 } 1561 critical_exit(); 1562 td->td_intr_nesting_level--; 1563 return (0); 1564 } 1565 #else 1566 /* 1567 * This is the main code for interrupt threads. 1568 */ 1569 static void 1570 ithread_loop(void *arg) 1571 { 1572 struct intr_thread *ithd; 1573 struct intr_handler *ih; 1574 struct intr_event *ie; 1575 struct thread *td; 1576 struct proc *p; 1577 int priv; 1578 int wake; 1579 1580 td = curthread; 1581 p = td->td_proc; 1582 ih = (struct intr_handler *)arg; 1583 priv = (ih->ih_thread != NULL) ? 1 : 0; 1584 ithd = (priv) ? ih->ih_thread : ih->ih_event->ie_thread; 1585 KASSERT(ithd->it_thread == td, 1586 ("%s: ithread and proc linkage out of sync", __func__)); 1587 ie = ithd->it_event; 1588 ie->ie_count = 0; 1589 wake = 0; 1590 1591 /* 1592 * As long as we have interrupts outstanding, go through the 1593 * list of handlers, giving each one a go at it. 1594 */ 1595 for (;;) { 1596 /* 1597 * If we are an orphaned thread, then just die. 1598 */ 1599 if (ithd->it_flags & IT_DEAD) { 1600 CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, 1601 p->p_pid, td->td_name); 1602 free(ithd, M_ITHREAD); 1603 kthread_exit(); 1604 } 1605 1606 /* 1607 * Service interrupts. If another interrupt arrives while 1608 * we are running, it will set it_need to note that we 1609 * should make another pass. 1610 * 1611 * The load_acq part of the following cmpset ensures 1612 * that the load of ih_need in ithread_execute_handlers() 1613 * is ordered after the load of it_need here. 1614 */ 1615 while (atomic_cmpset_acq_int(&ithd->it_need, 1, 0) != 0) { 1616 if (priv) 1617 priv_ithread_execute_handler(p, ih); 1618 else 1619 ithread_execute_handlers(p, ie); 1620 } 1621 WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); 1622 mtx_assert(&Giant, MA_NOTOWNED); 1623 1624 /* 1625 * Processed all our interrupts. Now get the sched 1626 * lock. This may take a while and it_need may get 1627 * set again, so we have to check it again. 1628 */ 1629 thread_lock(td); 1630 if (atomic_load_acq_int(&ithd->it_need) == 0 && 1631 (ithd->it_flags & (IT_DEAD | IT_WAIT)) == 0) { 1632 TD_SET_IWAIT(td); 1633 ie->ie_count = 0; 1634 mi_switch(SW_VOL | SWT_IWAIT, NULL); 1635 } 1636 if (ithd->it_flags & IT_WAIT) { 1637 wake = 1; 1638 ithd->it_flags &= ~IT_WAIT; 1639 } 1640 thread_unlock(td); 1641 if (wake) { 1642 wakeup(ithd); 1643 wake = 0; 1644 } 1645 } 1646 } 1647 1648 /* 1649 * Main loop for interrupt filter. 1650 * 1651 * Some architectures (i386, amd64 and arm) require the optional frame 1652 * parameter, and use it as the main argument for fast handler execution 1653 * when ih_argument == NULL. 1654 * 1655 * Return value: 1656 * o FILTER_STRAY: No filter recognized the event, and no 1657 * filter-less handler is registered on this 1658 * line. 1659 * o FILTER_HANDLED: A filter claimed the event and served it. 1660 * o FILTER_SCHEDULE_THREAD: No filter claimed the event, but there's at 1661 * least one filter-less handler on this line. 1662 * o FILTER_HANDLED | 1663 * FILTER_SCHEDULE_THREAD: A filter claimed the event, and asked for 1664 * scheduling the per-handler ithread. 1665 * 1666 * In case an ithread has to be scheduled, in *ithd there will be a 1667 * pointer to a struct intr_thread containing the thread to be 1668 * scheduled. 1669 */ 1670 1671 static int 1672 intr_filter_loop(struct intr_event *ie, struct trapframe *frame, 1673 struct intr_thread **ithd) 1674 { 1675 struct intr_handler *ih; 1676 void *arg; 1677 int ret, thread_only; 1678 1679 ret = 0; 1680 thread_only = 0; 1681 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 1682 /* 1683 * Execute fast interrupt handlers directly. 1684 * To support clock handlers, if a handler registers 1685 * with a NULL argument, then we pass it a pointer to 1686 * a trapframe as its argument. 1687 */ 1688 arg = ((ih->ih_argument == NULL) ? frame : ih->ih_argument); 1689 1690 CTR5(KTR_INTR, "%s: exec %p/%p(%p) for %s", __func__, 1691 ih->ih_filter, ih->ih_handler, arg, ih->ih_name); 1692 1693 if (ih->ih_filter != NULL) 1694 ret = ih->ih_filter(arg); 1695 else { 1696 thread_only = 1; 1697 continue; 1698 } 1699 KASSERT(ret == FILTER_STRAY || 1700 ((ret & (FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) != 0 && 1701 (ret & ~(FILTER_SCHEDULE_THREAD | FILTER_HANDLED)) == 0), 1702 ("%s: incorrect return value %#x from %s", __func__, ret, 1703 ih->ih_name)); 1704 if (ret & FILTER_STRAY) 1705 continue; 1706 else { 1707 *ithd = ih->ih_thread; 1708 return (ret); 1709 } 1710 } 1711 1712 /* 1713 * No filters handled the interrupt and we have at least 1714 * one handler without a filter. In this case, we schedule 1715 * all of the filter-less handlers to run in the ithread. 1716 */ 1717 if (thread_only) { 1718 *ithd = ie->ie_thread; 1719 return (FILTER_SCHEDULE_THREAD); 1720 } 1721 return (FILTER_STRAY); 1722 } 1723 1724 /* 1725 * Main interrupt handling body. 1726 * 1727 * Input: 1728 * o ie: the event connected to this interrupt. 1729 * o frame: some archs (i.e. i386) pass a frame to some. 1730 * handlers as their main argument. 1731 * Return value: 1732 * o 0: everything ok. 1733 * o EINVAL: stray interrupt. 1734 */ 1735 int 1736 intr_event_handle(struct intr_event *ie, struct trapframe *frame) 1737 { 1738 struct intr_thread *ithd; 1739 struct trapframe *oldframe; 1740 struct thread *td; 1741 int thread; 1742 1743 ithd = NULL; 1744 td = curthread; 1745 1746 if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers)) 1747 return (EINVAL); 1748 1749 td->td_intr_nesting_level++; 1750 thread = 0; 1751 critical_enter(); 1752 oldframe = td->td_intr_frame; 1753 td->td_intr_frame = frame; 1754 thread = intr_filter_loop(ie, frame, &ithd); 1755 if (thread & FILTER_HANDLED) { 1756 if (ie->ie_post_filter != NULL) 1757 ie->ie_post_filter(ie->ie_source); 1758 } else { 1759 if (ie->ie_pre_ithread != NULL) 1760 ie->ie_pre_ithread(ie->ie_source); 1761 } 1762 td->td_intr_frame = oldframe; 1763 critical_exit(); 1764 1765 /* Interrupt storm logic */ 1766 if (thread & FILTER_STRAY) { 1767 ie->ie_count++; 1768 if (ie->ie_count < intr_storm_threshold) 1769 printf("Interrupt stray detection not present\n"); 1770 } 1771 1772 /* Schedule an ithread if needed. */ 1773 if (thread & FILTER_SCHEDULE_THREAD) { 1774 if (intr_event_schedule_thread(ie, ithd) != 0) 1775 panic("%s: impossible stray interrupt", __func__); 1776 } 1777 td->td_intr_nesting_level--; 1778 return (0); 1779 } 1780 #endif 1781 1782 #ifdef DDB 1783 /* 1784 * Dump details about an interrupt handler 1785 */ 1786 static void 1787 db_dump_intrhand(struct intr_handler *ih) 1788 { 1789 int comma; 1790 1791 db_printf("\t%-10s ", ih->ih_name); 1792 switch (ih->ih_pri) { 1793 case PI_REALTIME: 1794 db_printf("CLK "); 1795 break; 1796 case PI_AV: 1797 db_printf("AV "); 1798 break; 1799 case PI_TTY: 1800 db_printf("TTY "); 1801 break; 1802 case PI_NET: 1803 db_printf("NET "); 1804 break; 1805 case PI_DISK: 1806 db_printf("DISK"); 1807 break; 1808 case PI_DULL: 1809 db_printf("DULL"); 1810 break; 1811 default: 1812 if (ih->ih_pri >= PI_SOFT) 1813 db_printf("SWI "); 1814 else 1815 db_printf("%4u", ih->ih_pri); 1816 break; 1817 } 1818 db_printf(" "); 1819 if (ih->ih_filter != NULL) { 1820 db_printf("[F]"); 1821 db_printsym((uintptr_t)ih->ih_filter, DB_STGY_PROC); 1822 } 1823 if (ih->ih_handler != NULL) { 1824 if (ih->ih_filter != NULL) 1825 db_printf(","); 1826 db_printf("[H]"); 1827 db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC); 1828 } 1829 db_printf("(%p)", ih->ih_argument); 1830 if (ih->ih_need || 1831 (ih->ih_flags & (IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD | 1832 IH_MPSAFE)) != 0) { 1833 db_printf(" {"); 1834 comma = 0; 1835 if (ih->ih_flags & IH_EXCLUSIVE) { 1836 if (comma) 1837 db_printf(", "); 1838 db_printf("EXCL"); 1839 comma = 1; 1840 } 1841 if (ih->ih_flags & IH_ENTROPY) { 1842 if (comma) 1843 db_printf(", "); 1844 db_printf("ENTROPY"); 1845 comma = 1; 1846 } 1847 if (ih->ih_flags & IH_DEAD) { 1848 if (comma) 1849 db_printf(", "); 1850 db_printf("DEAD"); 1851 comma = 1; 1852 } 1853 if (ih->ih_flags & IH_MPSAFE) { 1854 if (comma) 1855 db_printf(", "); 1856 db_printf("MPSAFE"); 1857 comma = 1; 1858 } 1859 if (ih->ih_need) { 1860 if (comma) 1861 db_printf(", "); 1862 db_printf("NEED"); 1863 } 1864 db_printf("}"); 1865 } 1866 db_printf("\n"); 1867 } 1868 1869 /* 1870 * Dump details about a event. 1871 */ 1872 void 1873 db_dump_intr_event(struct intr_event *ie, int handlers) 1874 { 1875 struct intr_handler *ih; 1876 struct intr_thread *it; 1877 int comma; 1878 1879 db_printf("%s ", ie->ie_fullname); 1880 it = ie->ie_thread; 1881 if (it != NULL) 1882 db_printf("(pid %d)", it->it_thread->td_proc->p_pid); 1883 else 1884 db_printf("(no thread)"); 1885 if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 || 1886 (it != NULL && it->it_need)) { 1887 db_printf(" {"); 1888 comma = 0; 1889 if (ie->ie_flags & IE_SOFT) { 1890 db_printf("SOFT"); 1891 comma = 1; 1892 } 1893 if (ie->ie_flags & IE_ENTROPY) { 1894 if (comma) 1895 db_printf(", "); 1896 db_printf("ENTROPY"); 1897 comma = 1; 1898 } 1899 if (ie->ie_flags & IE_ADDING_THREAD) { 1900 if (comma) 1901 db_printf(", "); 1902 db_printf("ADDING_THREAD"); 1903 comma = 1; 1904 } 1905 if (it != NULL && it->it_need) { 1906 if (comma) 1907 db_printf(", "); 1908 db_printf("NEED"); 1909 } 1910 db_printf("}"); 1911 } 1912 db_printf("\n"); 1913 1914 if (handlers) 1915 TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 1916 db_dump_intrhand(ih); 1917 } 1918 1919 /* 1920 * Dump data about interrupt handlers 1921 */ 1922 DB_SHOW_COMMAND(intr, db_show_intr) 1923 { 1924 struct intr_event *ie; 1925 int all, verbose; 1926 1927 verbose = strchr(modif, 'v') != NULL; 1928 all = strchr(modif, 'a') != NULL; 1929 TAILQ_FOREACH(ie, &event_list, ie_list) { 1930 if (!all && TAILQ_EMPTY(&ie->ie_handlers)) 1931 continue; 1932 db_dump_intr_event(ie, verbose); 1933 if (db_pager_quit) 1934 break; 1935 } 1936 } 1937 #endif /* DDB */ 1938 1939 /* 1940 * Start standard software interrupt threads 1941 */ 1942 static void 1943 start_softintr(void *dummy) 1944 { 1945 1946 if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih)) 1947 panic("died while creating vm swi ithread"); 1948 } 1949 SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, 1950 NULL); 1951 1952 /* 1953 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt. 1954 * The data for this machine dependent, and the declarations are in machine 1955 * dependent code. The layout of intrnames and intrcnt however is machine 1956 * independent. 1957 * 1958 * We do not know the length of intrcnt and intrnames at compile time, so 1959 * calculate things at run time. 1960 */ 1961 static int 1962 sysctl_intrnames(SYSCTL_HANDLER_ARGS) 1963 { 1964 return (sysctl_handle_opaque(oidp, intrnames, sintrnames, req)); 1965 } 1966 1967 SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD, 1968 NULL, 0, sysctl_intrnames, "", "Interrupt Names"); 1969 1970 static int 1971 sysctl_intrcnt(SYSCTL_HANDLER_ARGS) 1972 { 1973 #ifdef SCTL_MASK32 1974 uint32_t *intrcnt32; 1975 unsigned i; 1976 int error; 1977 1978 if (req->flags & SCTL_MASK32) { 1979 if (!req->oldptr) 1980 return (sysctl_handle_opaque(oidp, NULL, sintrcnt / 2, req)); 1981 intrcnt32 = malloc(sintrcnt / 2, M_TEMP, M_NOWAIT); 1982 if (intrcnt32 == NULL) 1983 return (ENOMEM); 1984 for (i = 0; i < sintrcnt / sizeof (u_long); i++) 1985 intrcnt32[i] = intrcnt[i]; 1986 error = sysctl_handle_opaque(oidp, intrcnt32, sintrcnt / 2, req); 1987 free(intrcnt32, M_TEMP); 1988 return (error); 1989 } 1990 #endif 1991 return (sysctl_handle_opaque(oidp, intrcnt, sintrcnt, req)); 1992 } 1993 1994 SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD, 1995 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts"); 1996 1997 #ifdef DDB 1998 /* 1999 * DDB command to dump the interrupt statistics. 2000 */ 2001 DB_SHOW_COMMAND(intrcnt, db_show_intrcnt) 2002 { 2003 u_long *i; 2004 char *cp; 2005 u_int j; 2006 2007 cp = intrnames; 2008 j = 0; 2009 for (i = intrcnt; j < (sintrcnt / sizeof(u_long)) && !db_pager_quit; 2010 i++, j++) { 2011 if (*cp == '\0') 2012 break; 2013 if (*i != 0) 2014 db_printf("%s\t%lu\n", cp, *i); 2015 cp += strlen(cp) + 1; 2016 } 2017 } 2018 #endif
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