kern_intr.c revision 165125
1139804Simp/*- 226156Sse * Copyright (c) 1997, Stefan Esser <se@freebsd.org> 326156Sse * All rights reserved. 426156Sse * 526156Sse * Redistribution and use in source and binary forms, with or without 626156Sse * modification, are permitted provided that the following conditions 726156Sse * are met: 826156Sse * 1. Redistributions of source code must retain the above copyright 926156Sse * notice unmodified, this list of conditions, and the following 1026156Sse * disclaimer. 1126156Sse * 2. Redistributions in binary form must reproduce the above copyright 1226156Sse * notice, this list of conditions and the following disclaimer in the 1326156Sse * documentation and/or other materials provided with the distribution. 1426156Sse * 1526156Sse * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1626156Sse * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1726156Sse * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1826156Sse * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1926156Sse * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2026156Sse * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2126156Sse * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2226156Sse * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2326156Sse * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2426156Sse * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2526156Sse */ 2626156Sse 27116182Sobrien#include <sys/cdefs.h> 28116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_intr.c 165125 2006-12-12 19:20:19Z jhb $"); 2936887Sdfr 30121482Sjhb#include "opt_ddb.h" 31121482Sjhb 3241059Speter#include <sys/param.h> 3365822Sjhb#include <sys/bus.h> 34110860Salfred#include <sys/conf.h> 3565822Sjhb#include <sys/rtprio.h> 3641059Speter#include <sys/systm.h> 3766698Sjhb#include <sys/interrupt.h> 3866698Sjhb#include <sys/kernel.h> 3966698Sjhb#include <sys/kthread.h> 4066698Sjhb#include <sys/ktr.h> 41130128Sbde#include <sys/limits.h> 4274914Sjhb#include <sys/lock.h> 4326156Sse#include <sys/malloc.h> 4467365Sjhb#include <sys/mutex.h> 4566698Sjhb#include <sys/proc.h> 4672759Sjhb#include <sys/random.h> 4772237Sjhb#include <sys/resourcevar.h> 48139451Sjhb#include <sys/sched.h> 4977582Stmm#include <sys/sysctl.h> 5066698Sjhb#include <sys/unistd.h> 5166698Sjhb#include <sys/vmmeter.h> 5266698Sjhb#include <machine/atomic.h> 5366698Sjhb#include <machine/cpu.h> 5467551Sjhb#include <machine/md_var.h> 5572237Sjhb#include <machine/stdarg.h> 56121482Sjhb#ifdef DDB 57121482Sjhb#include <ddb/ddb.h> 58121482Sjhb#include <ddb/db_sym.h> 59121482Sjhb#endif 6026156Sse 61151658Sjhb/* 62151658Sjhb * Describe an interrupt thread. There is one of these per interrupt event. 63151658Sjhb */ 64151658Sjhbstruct intr_thread { 65151658Sjhb struct intr_event *it_event; 66151658Sjhb struct thread *it_thread; /* Kernel thread. */ 67151658Sjhb int it_flags; /* (j) IT_* flags. */ 68151658Sjhb int it_need; /* Needs service. */ 6972759Sjhb}; 7072759Sjhb 71151658Sjhb/* Interrupt thread flags kept in it_flags */ 72151658Sjhb#define IT_DEAD 0x000001 /* Thread is waiting to exit. */ 73151658Sjhb 74151658Sjhbstruct intr_entropy { 75151658Sjhb struct thread *td; 76151658Sjhb uintptr_t event; 77151658Sjhb}; 78151658Sjhb 79151658Sjhbstruct intr_event *clk_intr_event; 80151658Sjhbstruct intr_event *tty_intr_event; 81128339Sbdevoid *softclock_ih; 82128339Sbdevoid *vm_ih; 8338244Sbde 8472237Sjhbstatic MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads"); 8572237Sjhb 86128331Sjhbstatic int intr_storm_threshold = 500; 87128331SjhbTUNABLE_INT("hw.intr_storm_threshold", &intr_storm_threshold); 88128331SjhbSYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RW, 89128331Sjhb &intr_storm_threshold, 0, 90128339Sbde "Number of consecutive interrupts before storm protection is enabled"); 91151658Sjhbstatic TAILQ_HEAD(, intr_event) event_list = 92151658Sjhb TAILQ_HEAD_INITIALIZER(event_list); 93128331Sjhb 94151658Sjhbstatic void intr_event_update(struct intr_event *ie); 95151658Sjhbstatic struct intr_thread *ithread_create(const char *name); 96151658Sjhbstatic void ithread_destroy(struct intr_thread *ithread); 97151658Sjhbstatic void ithread_execute_handlers(struct proc *p, struct intr_event *ie); 98128339Sbdestatic void ithread_loop(void *); 99151658Sjhbstatic void ithread_update(struct intr_thread *ithd); 100128339Sbdestatic void start_softintr(void *); 101128339Sbde 102165124Sjhb/* Map an interrupt type to an ithread priority. */ 10372237Sjhbu_char 104151658Sjhbintr_priority(enum intr_type flags) 10565822Sjhb{ 10672237Sjhb u_char pri; 10765822Sjhb 10872237Sjhb flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET | 10978365Speter INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV); 11065822Sjhb switch (flags) { 11172237Sjhb case INTR_TYPE_TTY: 11265822Sjhb pri = PI_TTYLOW; 11365822Sjhb break; 11465822Sjhb case INTR_TYPE_BIO: 11565822Sjhb /* 11665822Sjhb * XXX We need to refine this. BSD/OS distinguishes 11765822Sjhb * between tape and disk priorities. 11865822Sjhb */ 11965822Sjhb pri = PI_DISK; 12065822Sjhb break; 12165822Sjhb case INTR_TYPE_NET: 12265822Sjhb pri = PI_NET; 12365822Sjhb break; 12465822Sjhb case INTR_TYPE_CAM: 12565822Sjhb pri = PI_DISK; /* XXX or PI_CAM? */ 12665822Sjhb break; 12778365Speter case INTR_TYPE_AV: /* Audio/video */ 12878365Speter pri = PI_AV; 12978365Speter break; 13072237Sjhb case INTR_TYPE_CLK: 13172237Sjhb pri = PI_REALTIME; 13272237Sjhb break; 13365822Sjhb case INTR_TYPE_MISC: 13465822Sjhb pri = PI_DULL; /* don't care */ 13565822Sjhb break; 13665822Sjhb default: 13772237Sjhb /* We didn't specify an interrupt level. */ 138151658Sjhb panic("intr_priority: no interrupt type in flags"); 13965822Sjhb } 14065822Sjhb 14165822Sjhb return pri; 14265822Sjhb} 14365822Sjhb 14472237Sjhb/* 145151658Sjhb * Update an ithread based on the associated intr_event. 14672237Sjhb */ 14772237Sjhbstatic void 148151658Sjhbithread_update(struct intr_thread *ithd) 14972237Sjhb{ 150151658Sjhb struct intr_event *ie; 15183366Sjulian struct thread *td; 152151658Sjhb u_char pri; 15367551Sjhb 154151658Sjhb ie = ithd->it_event; 155151658Sjhb td = ithd->it_thread; 15672237Sjhb 157151658Sjhb /* Determine the overall priority of this event. */ 158151658Sjhb if (TAILQ_EMPTY(&ie->ie_handlers)) 159151658Sjhb pri = PRI_MAX_ITHD; 160151658Sjhb else 161151658Sjhb pri = TAILQ_FIRST(&ie->ie_handlers)->ih_pri; 162105354Srobert 163151658Sjhb /* Update name and priority. */ 164151658Sjhb strlcpy(td->td_proc->p_comm, ie->ie_fullname, 165151658Sjhb sizeof(td->td_proc->p_comm)); 16694457Sjhb mtx_lock_spin(&sched_lock); 167151658Sjhb sched_prio(td, pri); 16894457Sjhb mtx_unlock_spin(&sched_lock); 169151658Sjhb} 170151658Sjhb 171151658Sjhb/* 172151658Sjhb * Regenerate the full name of an interrupt event and update its priority. 173151658Sjhb */ 174151658Sjhbstatic void 175151658Sjhbintr_event_update(struct intr_event *ie) 176151658Sjhb{ 177151658Sjhb struct intr_handler *ih; 178151658Sjhb char *last; 179151658Sjhb int missed, space; 180151658Sjhb 181151658Sjhb /* Start off with no entropy and just the name of the event. */ 182151658Sjhb mtx_assert(&ie->ie_lock, MA_OWNED); 183151658Sjhb strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 184151658Sjhb ie->ie_flags &= ~IE_ENTROPY; 185137267Sjhb missed = 0; 186151658Sjhb space = 1; 187151658Sjhb 188151658Sjhb /* Run through all the handlers updating values. */ 189151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 190151658Sjhb if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 < 191151658Sjhb sizeof(ie->ie_fullname)) { 192151658Sjhb strcat(ie->ie_fullname, " "); 193151658Sjhb strcat(ie->ie_fullname, ih->ih_name); 194151658Sjhb space = 0; 195137267Sjhb } else 196137267Sjhb missed++; 197137267Sjhb if (ih->ih_flags & IH_ENTROPY) 198151658Sjhb ie->ie_flags |= IE_ENTROPY; 199137267Sjhb } 200151658Sjhb 201151658Sjhb /* 202151658Sjhb * If the handler names were too long, add +'s to indicate missing 203151658Sjhb * names. If we run out of room and still have +'s to add, change 204151658Sjhb * the last character from a + to a *. 205151658Sjhb */ 206151658Sjhb last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2]; 207137267Sjhb while (missed-- > 0) { 208151658Sjhb if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) { 209151658Sjhb if (*last == '+') { 210151658Sjhb *last = '*'; 211151658Sjhb break; 212151658Sjhb } else 213151658Sjhb *last = '+'; 214151658Sjhb } else if (space) { 215151658Sjhb strcat(ie->ie_fullname, " +"); 216151658Sjhb space = 0; 21772237Sjhb } else 218151658Sjhb strcat(ie->ie_fullname, "+"); 21972237Sjhb } 220151658Sjhb 221151658Sjhb /* 222151658Sjhb * If this event has an ithread, update it's priority and 223151658Sjhb * name. 224151658Sjhb */ 225151658Sjhb if (ie->ie_thread != NULL) 226151658Sjhb ithread_update(ie->ie_thread); 227151658Sjhb CTR2(KTR_INTR, "%s: updated %s", __func__, ie->ie_fullname); 22872237Sjhb} 22972237Sjhb 23072237Sjhbint 231151658Sjhbintr_event_create(struct intr_event **event, void *source, int flags, 232151658Sjhb void (*enable)(void *), const char *fmt, ...) 23366698Sjhb{ 234151658Sjhb struct intr_event *ie; 23572237Sjhb va_list ap; 23672237Sjhb 237151658Sjhb /* The only valid flag during creation is IE_SOFT. */ 238151658Sjhb if ((flags & ~IE_SOFT) != 0) 23972759Sjhb return (EINVAL); 240151658Sjhb ie = malloc(sizeof(struct intr_event), M_ITHREAD, M_WAITOK | M_ZERO); 241151658Sjhb ie->ie_source = source; 242151658Sjhb ie->ie_enable = enable; 243151658Sjhb ie->ie_flags = flags; 244151658Sjhb TAILQ_INIT(&ie->ie_handlers); 245151658Sjhb mtx_init(&ie->ie_lock, "intr event", NULL, MTX_DEF); 24672759Sjhb 24772237Sjhb va_start(ap, fmt); 248151658Sjhb vsnprintf(ie->ie_name, sizeof(ie->ie_name), fmt, ap); 24972237Sjhb va_end(ap); 250151658Sjhb strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 251151658Sjhb mtx_pool_lock(mtxpool_sleep, &event_list); 252151658Sjhb TAILQ_INSERT_TAIL(&event_list, ie, ie_list); 253151658Sjhb mtx_pool_unlock(mtxpool_sleep, &event_list); 254151658Sjhb if (event != NULL) 255151658Sjhb *event = ie; 256151658Sjhb CTR2(KTR_INTR, "%s: created %s", __func__, ie->ie_name); 257151658Sjhb return (0); 258151658Sjhb} 25972237Sjhb 260151658Sjhbint 261151658Sjhbintr_event_destroy(struct intr_event *ie) 262151658Sjhb{ 263151658Sjhb 264151658Sjhb mtx_lock(&ie->ie_lock); 265151658Sjhb if (!TAILQ_EMPTY(&ie->ie_handlers)) { 266151658Sjhb mtx_unlock(&ie->ie_lock); 267151658Sjhb return (EBUSY); 268151658Sjhb } 269151658Sjhb mtx_pool_lock(mtxpool_sleep, &event_list); 270151658Sjhb TAILQ_REMOVE(&event_list, ie, ie_list); 271151658Sjhb mtx_pool_unlock(mtxpool_sleep, &event_list); 272157728Sjhb#ifndef notyet 273157728Sjhb if (ie->ie_thread != NULL) { 274157728Sjhb ithread_destroy(ie->ie_thread); 275157728Sjhb ie->ie_thread = NULL; 276157728Sjhb } 277157728Sjhb#endif 278151658Sjhb mtx_unlock(&ie->ie_lock); 279151658Sjhb mtx_destroy(&ie->ie_lock); 280151658Sjhb free(ie, M_ITHREAD); 281151658Sjhb return (0); 282151658Sjhb} 283151658Sjhb 284151658Sjhbstatic struct intr_thread * 285151658Sjhbithread_create(const char *name) 286151658Sjhb{ 287151658Sjhb struct intr_thread *ithd; 288151658Sjhb struct thread *td; 289151658Sjhb struct proc *p; 290151658Sjhb int error; 291151658Sjhb 292151658Sjhb ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); 293151658Sjhb 29472237Sjhb error = kthread_create(ithread_loop, ithd, &p, RFSTOPPED | RFHIGHPID, 295151658Sjhb 0, "%s", name); 296151658Sjhb if (error) 297151658Sjhb panic("kthread_create() failed with %d", error); 29890361Sjulian td = FIRST_THREAD_IN_PROC(p); /* XXXKSE */ 299113629Sjhb mtx_lock_spin(&sched_lock); 300164936Sjulian sched_class(td, PRI_ITHD); 301103216Sjulian TD_SET_IWAIT(td); 302113629Sjhb mtx_unlock_spin(&sched_lock); 303151658Sjhb td->td_pflags |= TDP_ITHREAD; 304151658Sjhb ithd->it_thread = td; 305151658Sjhb CTR2(KTR_INTR, "%s: created %s", __func__, name); 306151658Sjhb return (ithd); 30772237Sjhb} 30872237Sjhb 309151658Sjhbstatic void 310151658Sjhbithread_destroy(struct intr_thread *ithread) 31172237Sjhb{ 31283366Sjulian struct thread *td; 31372237Sjhb 314157784Sscottl CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name); 315151658Sjhb td = ithread->it_thread; 316151658Sjhb mtx_lock_spin(&sched_lock); 31776771Sjhb ithread->it_flags |= IT_DEAD; 318103216Sjulian if (TD_AWAITING_INTR(td)) { 319103216Sjulian TD_CLR_IWAIT(td); 320134586Sjulian setrunqueue(td, SRQ_INTR); 32172237Sjhb } 32272237Sjhb mtx_unlock_spin(&sched_lock); 32372237Sjhb} 32472237Sjhb 32572237Sjhbint 326151658Sjhbintr_event_add_handler(struct intr_event *ie, const char *name, 32772237Sjhb driver_intr_t handler, void *arg, u_char pri, enum intr_type flags, 32872237Sjhb void **cookiep) 32972237Sjhb{ 330151658Sjhb struct intr_handler *ih, *temp_ih; 331151658Sjhb struct intr_thread *it; 33272237Sjhb 333151658Sjhb if (ie == NULL || name == NULL || handler == NULL) 33472237Sjhb return (EINVAL); 33572237Sjhb 336151658Sjhb /* Allocate and populate an interrupt handler structure. */ 337151658Sjhb ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); 33872237Sjhb ih->ih_handler = handler; 33972237Sjhb ih->ih_argument = arg; 34072237Sjhb ih->ih_name = name; 341151658Sjhb ih->ih_event = ie; 34272237Sjhb ih->ih_pri = pri; 34372237Sjhb if (flags & INTR_FAST) 344122002Sjhb ih->ih_flags = IH_FAST; 34572237Sjhb else if (flags & INTR_EXCL) 34672237Sjhb ih->ih_flags = IH_EXCLUSIVE; 34772237Sjhb if (flags & INTR_MPSAFE) 34872237Sjhb ih->ih_flags |= IH_MPSAFE; 34972237Sjhb if (flags & INTR_ENTROPY) 35072237Sjhb ih->ih_flags |= IH_ENTROPY; 35172237Sjhb 352151658Sjhb /* We can only have one exclusive handler in a event. */ 353151658Sjhb mtx_lock(&ie->ie_lock); 354151658Sjhb if (!TAILQ_EMPTY(&ie->ie_handlers)) { 355151658Sjhb if ((flags & INTR_EXCL) || 356151658Sjhb (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { 357151658Sjhb mtx_unlock(&ie->ie_lock); 358151658Sjhb free(ih, M_ITHREAD); 359151658Sjhb return (EINVAL); 360151658Sjhb } 361122002Sjhb } 36272237Sjhb 363151658Sjhb /* Add the new handler to the event in priority order. */ 364151658Sjhb TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { 365151658Sjhb if (temp_ih->ih_pri > ih->ih_pri) 366151658Sjhb break; 367151658Sjhb } 36872237Sjhb if (temp_ih == NULL) 369151658Sjhb TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); 37072237Sjhb else 37172237Sjhb TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); 372151658Sjhb intr_event_update(ie); 37372237Sjhb 374151658Sjhb /* Create a thread if we need one. */ 375151658Sjhb while (ie->ie_thread == NULL && !(flags & INTR_FAST)) { 376151658Sjhb if (ie->ie_flags & IE_ADDING_THREAD) 377157815Sjhb msleep(ie, &ie->ie_lock, 0, "ithread", 0); 378151658Sjhb else { 379151658Sjhb ie->ie_flags |= IE_ADDING_THREAD; 380151658Sjhb mtx_unlock(&ie->ie_lock); 381151658Sjhb it = ithread_create("intr: newborn"); 382151658Sjhb mtx_lock(&ie->ie_lock); 383151658Sjhb ie->ie_flags &= ~IE_ADDING_THREAD; 384151658Sjhb ie->ie_thread = it; 385151658Sjhb it->it_event = ie; 386151658Sjhb ithread_update(it); 387151658Sjhb wakeup(ie); 388151658Sjhb } 389151658Sjhb } 390151658Sjhb CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, 391151658Sjhb ie->ie_name); 392151658Sjhb mtx_unlock(&ie->ie_lock); 393151658Sjhb 39472237Sjhb if (cookiep != NULL) 39572237Sjhb *cookiep = ih; 39672237Sjhb return (0); 39772237Sjhb} 39872237Sjhb 399165125Sjhb/* 400165125Sjhb * Return the ie_source field from the intr_event an intr_handler is 401165125Sjhb * associated with. 402165125Sjhb */ 403165125Sjhbvoid * 404165125Sjhbintr_handler_source(void *cookie) 405165125Sjhb{ 406165125Sjhb struct intr_handler *ih; 407165125Sjhb struct intr_event *ie; 408165125Sjhb 409165125Sjhb ih = (struct intr_handler *)cookie; 410165125Sjhb if (ih == NULL) 411165125Sjhb return (NULL); 412165125Sjhb ie = ih->ih_event; 413165125Sjhb KASSERT(ie != NULL, 414165125Sjhb ("interrupt handler \"%s\" has a NULL interrupt event", 415165125Sjhb ih->ih_name)); 416165125Sjhb return (ie->ie_source); 417165125Sjhb} 418165125Sjhb 41972237Sjhbint 420151658Sjhbintr_event_remove_handler(void *cookie) 42172237Sjhb{ 422151658Sjhb struct intr_handler *handler = (struct intr_handler *)cookie; 423151658Sjhb struct intr_event *ie; 42472237Sjhb#ifdef INVARIANTS 425151658Sjhb struct intr_handler *ih; 42672237Sjhb#endif 427151658Sjhb#ifdef notyet 428151658Sjhb int dead; 429151658Sjhb#endif 43072237Sjhb 43172759Sjhb if (handler == NULL) 43272237Sjhb return (EINVAL); 433151658Sjhb ie = handler->ih_event; 434151658Sjhb KASSERT(ie != NULL, 435151658Sjhb ("interrupt handler \"%s\" has a NULL interrupt event", 436165124Sjhb handler->ih_name)); 437151658Sjhb mtx_lock(&ie->ie_lock); 43887593Sobrien CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, 439151658Sjhb ie->ie_name); 44072237Sjhb#ifdef INVARIANTS 441151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 44272759Sjhb if (ih == handler) 44372759Sjhb goto ok; 444151658Sjhb mtx_unlock(&ie->ie_lock); 445151658Sjhb panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", 446151658Sjhb ih->ih_name, ie->ie_name); 44772759Sjhbok: 44872237Sjhb#endif 44972839Sjhb /* 450151658Sjhb * If there is no ithread, then just remove the handler and return. 451151658Sjhb * XXX: Note that an INTR_FAST handler might be running on another 452151658Sjhb * CPU! 453151658Sjhb */ 454151658Sjhb if (ie->ie_thread == NULL) { 455151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 456151658Sjhb mtx_unlock(&ie->ie_lock); 457151658Sjhb free(handler, M_ITHREAD); 458151658Sjhb return (0); 459151658Sjhb } 460151658Sjhb 461151658Sjhb /* 46272839Sjhb * If the interrupt thread is already running, then just mark this 46372839Sjhb * handler as being dead and let the ithread do the actual removal. 464124505Struckman * 465124505Struckman * During a cold boot while cold is set, msleep() does not sleep, 466124505Struckman * so we have to remove the handler here rather than letting the 467124505Struckman * thread do it. 46872839Sjhb */ 46972839Sjhb mtx_lock_spin(&sched_lock); 470151658Sjhb if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) { 47172839Sjhb handler->ih_flags |= IH_DEAD; 47272839Sjhb 47372839Sjhb /* 47472839Sjhb * Ensure that the thread will process the handler list 47572839Sjhb * again and remove this handler if it has already passed 47672839Sjhb * it on the list. 47772839Sjhb */ 478151658Sjhb ie->ie_thread->it_need = 1; 479151658Sjhb } else 480151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 48172839Sjhb mtx_unlock_spin(&sched_lock); 482151658Sjhb while (handler->ih_flags & IH_DEAD) 483157815Sjhb msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); 484151658Sjhb intr_event_update(ie); 485151658Sjhb#ifdef notyet 486151658Sjhb /* 487151658Sjhb * XXX: This could be bad in the case of ppbus(8). Also, I think 488151658Sjhb * this could lead to races of stale data when servicing an 489151658Sjhb * interrupt. 490151658Sjhb */ 491151658Sjhb dead = 1; 492151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 493151658Sjhb if (!(ih->ih_flags & IH_FAST)) { 494151658Sjhb dead = 0; 495151658Sjhb break; 496151658Sjhb } 497151658Sjhb } 498151658Sjhb if (dead) { 499151658Sjhb ithread_destroy(ie->ie_thread); 500151658Sjhb ie->ie_thread = NULL; 501151658Sjhb } 502151658Sjhb#endif 503151658Sjhb mtx_unlock(&ie->ie_lock); 50476771Sjhb free(handler, M_ITHREAD); 50572237Sjhb return (0); 50672237Sjhb} 50772237Sjhb 50872237Sjhbint 509151658Sjhbintr_event_schedule_thread(struct intr_event *ie) 51072759Sjhb{ 511151658Sjhb struct intr_entropy entropy; 512151658Sjhb struct intr_thread *it; 51383366Sjulian struct thread *td; 514101176Sjulian struct thread *ctd; 51572759Sjhb struct proc *p; 51672759Sjhb 51772759Sjhb /* 51872759Sjhb * If no ithread or no handlers, then we have a stray interrupt. 51972759Sjhb */ 520151658Sjhb if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || 521151658Sjhb ie->ie_thread == NULL) 52272759Sjhb return (EINVAL); 52372759Sjhb 524101176Sjulian ctd = curthread; 525151658Sjhb it = ie->ie_thread; 526151658Sjhb td = it->it_thread; 527133191Srwatson p = td->td_proc; 528151658Sjhb 52972759Sjhb /* 53072759Sjhb * If any of the handlers for this ithread claim to be good 53172759Sjhb * sources of entropy, then gather some. 53272759Sjhb */ 533151658Sjhb if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) { 534133191Srwatson CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__, 535133191Srwatson p->p_pid, p->p_comm); 536151658Sjhb entropy.event = (uintptr_t)ie; 537151658Sjhb entropy.td = ctd; 53872759Sjhb random_harvest(&entropy, sizeof(entropy), 2, 0, 53972759Sjhb RANDOM_INTERRUPT); 54072759Sjhb } 54172759Sjhb 542151658Sjhb KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); 54372759Sjhb 54472759Sjhb /* 54572759Sjhb * Set it_need to tell the thread to keep running if it is already 54672759Sjhb * running. Then, grab sched_lock and see if we actually need to 547131481Sjhb * put this thread on the runqueue. 54872759Sjhb */ 549151658Sjhb it->it_need = 1; 55072759Sjhb mtx_lock_spin(&sched_lock); 551103216Sjulian if (TD_AWAITING_INTR(td)) { 552151658Sjhb CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, 553151658Sjhb p->p_comm); 554103216Sjulian TD_CLR_IWAIT(td); 555134586Sjulian setrunqueue(td, SRQ_INTR); 55672759Sjhb } else { 557151658Sjhb CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", 558151658Sjhb __func__, p->p_pid, p->p_comm, it->it_need, td->td_state); 55972759Sjhb } 56072759Sjhb mtx_unlock_spin(&sched_lock); 56172759Sjhb 56272759Sjhb return (0); 56372759Sjhb} 56472759Sjhb 565151699Sjhb/* 566151699Sjhb * Add a software interrupt handler to a specified event. If a given event 567151699Sjhb * is not specified, then a new event is created. 568151699Sjhb */ 56972759Sjhbint 570151658Sjhbswi_add(struct intr_event **eventp, const char *name, driver_intr_t handler, 57172237Sjhb void *arg, int pri, enum intr_type flags, void **cookiep) 57272237Sjhb{ 573151658Sjhb struct intr_event *ie; 57472237Sjhb int error; 57566698Sjhb 57672759Sjhb if (flags & (INTR_FAST | INTR_ENTROPY)) 57772759Sjhb return (EINVAL); 57872759Sjhb 579151658Sjhb ie = (eventp != NULL) ? *eventp : NULL; 58066698Sjhb 581151658Sjhb if (ie != NULL) { 582151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 583151658Sjhb return (EINVAL); 58472759Sjhb } else { 585151658Sjhb error = intr_event_create(&ie, NULL, IE_SOFT, NULL, 58672237Sjhb "swi%d:", pri); 58767551Sjhb if (error) 58872237Sjhb return (error); 589151658Sjhb if (eventp != NULL) 590151658Sjhb *eventp = ie; 59166698Sjhb } 592151658Sjhb return (intr_event_add_handler(ie, name, handler, arg, 59372376Sjake (pri * RQ_PPQ) + PI_SOFT, flags, cookiep)); 594134791Sjulian /* XXKSE.. think of a better way to get separate queues */ 59566698Sjhb} 59666698Sjhb 59766698Sjhb/* 598151658Sjhb * Schedule a software interrupt thread. 59966698Sjhb */ 60067551Sjhbvoid 60172237Sjhbswi_sched(void *cookie, int flags) 60266698Sjhb{ 603151658Sjhb struct intr_handler *ih = (struct intr_handler *)cookie; 604151658Sjhb struct intr_event *ie = ih->ih_event; 60572759Sjhb int error; 60666698Sjhb 607151658Sjhb CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name, 608151658Sjhb ih->ih_need); 609151658Sjhb 61067551Sjhb /* 61172759Sjhb * Set ih_need for this handler so that if the ithread is already 61272759Sjhb * running it will execute this handler on the next pass. Otherwise, 61372759Sjhb * it will execute it the next time it runs. 61467551Sjhb */ 61572237Sjhb atomic_store_rel_int(&ih->ih_need, 1); 616163474Sbde 61772237Sjhb if (!(flags & SWI_DELAY)) { 618163474Sbde PCPU_LAZY_INC(cnt.v_soft); 619151658Sjhb error = intr_event_schedule_thread(ie); 62072759Sjhb KASSERT(error == 0, ("stray software interrupt")); 62166698Sjhb } 62266698Sjhb} 62366698Sjhb 624151699Sjhb/* 625151699Sjhb * Remove a software interrupt handler. Currently this code does not 626151699Sjhb * remove the associated interrupt event if it becomes empty. Calling code 627151699Sjhb * may do so manually via intr_event_destroy(), but that's not really 628151699Sjhb * an optimal interface. 629151699Sjhb */ 630151699Sjhbint 631151699Sjhbswi_remove(void *cookie) 632151699Sjhb{ 633151699Sjhb 634151699Sjhb return (intr_event_remove_handler(cookie)); 635151699Sjhb} 636151699Sjhb 637151658Sjhbstatic void 638151658Sjhbithread_execute_handlers(struct proc *p, struct intr_event *ie) 639151658Sjhb{ 640151658Sjhb struct intr_handler *ih, *ihn; 641151658Sjhb 642151658Sjhb /* Interrupt handlers should not sleep. */ 643151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 644151658Sjhb THREAD_NO_SLEEPING(); 645151658Sjhb TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) { 646151658Sjhb 647151658Sjhb /* 648151658Sjhb * If this handler is marked for death, remove it from 649151658Sjhb * the list of handlers and wake up the sleeper. 650151658Sjhb */ 651151658Sjhb if (ih->ih_flags & IH_DEAD) { 652151658Sjhb mtx_lock(&ie->ie_lock); 653151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); 654151658Sjhb ih->ih_flags &= ~IH_DEAD; 655151658Sjhb wakeup(ih); 656151658Sjhb mtx_unlock(&ie->ie_lock); 657151658Sjhb continue; 658151658Sjhb } 659151658Sjhb 660151658Sjhb /* 661151658Sjhb * For software interrupt threads, we only execute 662151658Sjhb * handlers that have their need flag set. Hardware 663151658Sjhb * interrupt threads always invoke all of their handlers. 664151658Sjhb */ 665151658Sjhb if (ie->ie_flags & IE_SOFT) { 666151658Sjhb if (!ih->ih_need) 667151658Sjhb continue; 668151658Sjhb else 669151658Sjhb atomic_store_rel_int(&ih->ih_need, 0); 670151658Sjhb } 671151658Sjhb 672151658Sjhb /* Fast handlers are handled in primary interrupt context. */ 673151658Sjhb if (ih->ih_flags & IH_FAST) 674151658Sjhb continue; 675151658Sjhb 676151658Sjhb /* Execute this handler. */ 677151658Sjhb CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", 678151658Sjhb __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument, 679151658Sjhb ih->ih_name, ih->ih_flags); 680151658Sjhb 681151658Sjhb if (!(ih->ih_flags & IH_MPSAFE)) 682151658Sjhb mtx_lock(&Giant); 683151658Sjhb ih->ih_handler(ih->ih_argument); 684151658Sjhb if (!(ih->ih_flags & IH_MPSAFE)) 685151658Sjhb mtx_unlock(&Giant); 686151658Sjhb } 687151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 688151658Sjhb THREAD_SLEEPING_OK(); 689151658Sjhb 690151658Sjhb /* 691151658Sjhb * Interrupt storm handling: 692151658Sjhb * 693151658Sjhb * If this interrupt source is currently storming, then throttle 694151658Sjhb * it to only fire the handler once per clock tick. 695151658Sjhb * 696151658Sjhb * If this interrupt source is not currently storming, but the 697151658Sjhb * number of back to back interrupts exceeds the storm threshold, 698151658Sjhb * then enter storming mode. 699151658Sjhb */ 700151658Sjhb if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold) { 701151658Sjhb if (ie->ie_warned == 0) { 702151658Sjhb printf( 703151658Sjhb "Interrupt storm detected on \"%s\"; throttling interrupt source\n", 704151658Sjhb ie->ie_name); 705151658Sjhb ie->ie_warned = 1; 706151658Sjhb } 707157815Sjhb tsleep(&ie->ie_count, 0, "istorm", 1); 708151658Sjhb } else 709151658Sjhb ie->ie_count++; 710151658Sjhb 711151658Sjhb /* 712151658Sjhb * Now that all the handlers have had a chance to run, reenable 713151658Sjhb * the interrupt source. 714151658Sjhb */ 715151658Sjhb if (ie->ie_enable != NULL) 716151658Sjhb ie->ie_enable(ie->ie_source); 717151658Sjhb} 718151658Sjhb 71966698Sjhb/* 72072237Sjhb * This is the main code for interrupt threads. 72166698Sjhb */ 722104094Sphkstatic void 72372237Sjhbithread_loop(void *arg) 72466698Sjhb{ 725151658Sjhb struct intr_thread *ithd; 726151658Sjhb struct intr_event *ie; 72783366Sjulian struct thread *td; 72872237Sjhb struct proc *p; 729151658Sjhb 73083366Sjulian td = curthread; 73183366Sjulian p = td->td_proc; 732151658Sjhb ithd = (struct intr_thread *)arg; 733151658Sjhb KASSERT(ithd->it_thread == td, 73487593Sobrien ("%s: ithread and proc linkage out of sync", __func__)); 735151658Sjhb ie = ithd->it_event; 736151658Sjhb ie->ie_count = 0; 73766698Sjhb 73867551Sjhb /* 73967551Sjhb * As long as we have interrupts outstanding, go through the 74067551Sjhb * list of handlers, giving each one a go at it. 74167551Sjhb */ 74266698Sjhb for (;;) { 74372237Sjhb /* 74472237Sjhb * If we are an orphaned thread, then just die. 74572237Sjhb */ 74672237Sjhb if (ithd->it_flags & IT_DEAD) { 747151658Sjhb CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, 74872237Sjhb p->p_pid, p->p_comm); 74972237Sjhb free(ithd, M_ITHREAD); 75072237Sjhb kthread_exit(0); 75172237Sjhb } 75272237Sjhb 753151658Sjhb /* 754151658Sjhb * Service interrupts. If another interrupt arrives while 755151658Sjhb * we are running, it will set it_need to note that we 756151658Sjhb * should make another pass. 757151658Sjhb */ 75872237Sjhb while (ithd->it_need) { 75967551Sjhb /* 760151658Sjhb * This might need a full read and write barrier 761151658Sjhb * to make sure that this write posts before any 762151658Sjhb * of the memory or device accesses in the 763151658Sjhb * handlers. 76467551Sjhb */ 76572237Sjhb atomic_store_rel_int(&ithd->it_need, 0); 766151658Sjhb ithread_execute_handlers(p, ie); 76766698Sjhb } 768128331Sjhb WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); 769128331Sjhb mtx_assert(&Giant, MA_NOTOWNED); 77067551Sjhb 77166698Sjhb /* 77266698Sjhb * Processed all our interrupts. Now get the sched 77367551Sjhb * lock. This may take a while and it_need may get 77466698Sjhb * set again, so we have to check it again. 77566698Sjhb */ 77672200Sbmilekic mtx_lock_spin(&sched_lock); 777151658Sjhb if (!ithd->it_need && !(ithd->it_flags & IT_DEAD)) { 778128331Sjhb TD_SET_IWAIT(td); 779151658Sjhb ie->ie_count = 0; 780131473Sjhb mi_switch(SW_VOL, NULL); 78166698Sjhb } 78272200Sbmilekic mtx_unlock_spin(&sched_lock); 78366698Sjhb } 78466698Sjhb} 78566698Sjhb 786121482Sjhb#ifdef DDB 78772237Sjhb/* 788121482Sjhb * Dump details about an interrupt handler 789121482Sjhb */ 790121482Sjhbstatic void 791151658Sjhbdb_dump_intrhand(struct intr_handler *ih) 792121482Sjhb{ 793121482Sjhb int comma; 794121482Sjhb 795121482Sjhb db_printf("\t%-10s ", ih->ih_name); 796121482Sjhb switch (ih->ih_pri) { 797121482Sjhb case PI_REALTIME: 798121482Sjhb db_printf("CLK "); 799121482Sjhb break; 800121482Sjhb case PI_AV: 801121482Sjhb db_printf("AV "); 802121482Sjhb break; 803121482Sjhb case PI_TTYHIGH: 804121482Sjhb case PI_TTYLOW: 805121482Sjhb db_printf("TTY "); 806121482Sjhb break; 807121482Sjhb case PI_TAPE: 808121482Sjhb db_printf("TAPE"); 809121482Sjhb break; 810121482Sjhb case PI_NET: 811121482Sjhb db_printf("NET "); 812121482Sjhb break; 813121482Sjhb case PI_DISK: 814121482Sjhb case PI_DISKLOW: 815121482Sjhb db_printf("DISK"); 816121482Sjhb break; 817121482Sjhb case PI_DULL: 818121482Sjhb db_printf("DULL"); 819121482Sjhb break; 820121482Sjhb default: 821121482Sjhb if (ih->ih_pri >= PI_SOFT) 822121482Sjhb db_printf("SWI "); 823121482Sjhb else 824121482Sjhb db_printf("%4u", ih->ih_pri); 825121482Sjhb break; 826121482Sjhb } 827121482Sjhb db_printf(" "); 828121482Sjhb db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC); 829121482Sjhb db_printf("(%p)", ih->ih_argument); 830121482Sjhb if (ih->ih_need || 831121482Sjhb (ih->ih_flags & (IH_FAST | IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD | 832121482Sjhb IH_MPSAFE)) != 0) { 833121482Sjhb db_printf(" {"); 834121482Sjhb comma = 0; 835121482Sjhb if (ih->ih_flags & IH_FAST) { 836121482Sjhb db_printf("FAST"); 837121482Sjhb comma = 1; 838121482Sjhb } 839121482Sjhb if (ih->ih_flags & IH_EXCLUSIVE) { 840121482Sjhb if (comma) 841121482Sjhb db_printf(", "); 842121482Sjhb db_printf("EXCL"); 843121482Sjhb comma = 1; 844121482Sjhb } 845121482Sjhb if (ih->ih_flags & IH_ENTROPY) { 846121482Sjhb if (comma) 847121482Sjhb db_printf(", "); 848121482Sjhb db_printf("ENTROPY"); 849121482Sjhb comma = 1; 850121482Sjhb } 851121482Sjhb if (ih->ih_flags & IH_DEAD) { 852121482Sjhb if (comma) 853121482Sjhb db_printf(", "); 854121482Sjhb db_printf("DEAD"); 855121482Sjhb comma = 1; 856121482Sjhb } 857121482Sjhb if (ih->ih_flags & IH_MPSAFE) { 858121482Sjhb if (comma) 859121482Sjhb db_printf(", "); 860121482Sjhb db_printf("MPSAFE"); 861121482Sjhb comma = 1; 862121482Sjhb } 863121482Sjhb if (ih->ih_need) { 864121482Sjhb if (comma) 865121482Sjhb db_printf(", "); 866121482Sjhb db_printf("NEED"); 867121482Sjhb } 868121482Sjhb db_printf("}"); 869121482Sjhb } 870121482Sjhb db_printf("\n"); 871121482Sjhb} 872121482Sjhb 873121482Sjhb/* 874151658Sjhb * Dump details about a event. 875121482Sjhb */ 876121482Sjhbvoid 877151658Sjhbdb_dump_intr_event(struct intr_event *ie, int handlers) 878121482Sjhb{ 879151658Sjhb struct intr_handler *ih; 880151658Sjhb struct intr_thread *it; 881121482Sjhb int comma; 882121482Sjhb 883151658Sjhb db_printf("%s ", ie->ie_fullname); 884151658Sjhb it = ie->ie_thread; 885151658Sjhb if (it != NULL) 886151658Sjhb db_printf("(pid %d)", it->it_thread->td_proc->p_pid); 887151658Sjhb else 888151658Sjhb db_printf("(no thread)"); 889151658Sjhb if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 || 890151658Sjhb (it != NULL && it->it_need)) { 891121482Sjhb db_printf(" {"); 892121482Sjhb comma = 0; 893151658Sjhb if (ie->ie_flags & IE_SOFT) { 894121482Sjhb db_printf("SOFT"); 895121482Sjhb comma = 1; 896121482Sjhb } 897151658Sjhb if (ie->ie_flags & IE_ENTROPY) { 898121482Sjhb if (comma) 899121482Sjhb db_printf(", "); 900121482Sjhb db_printf("ENTROPY"); 901121482Sjhb comma = 1; 902121482Sjhb } 903151658Sjhb if (ie->ie_flags & IE_ADDING_THREAD) { 904121482Sjhb if (comma) 905121482Sjhb db_printf(", "); 906151658Sjhb db_printf("ADDING_THREAD"); 907121482Sjhb comma = 1; 908121482Sjhb } 909151658Sjhb if (it != NULL && it->it_need) { 910121482Sjhb if (comma) 911121482Sjhb db_printf(", "); 912121482Sjhb db_printf("NEED"); 913121482Sjhb } 914121482Sjhb db_printf("}"); 915121482Sjhb } 916121482Sjhb db_printf("\n"); 917121482Sjhb 918121482Sjhb if (handlers) 919151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 920121482Sjhb db_dump_intrhand(ih); 921121482Sjhb} 922151658Sjhb 923151658Sjhb/* 924151658Sjhb * Dump data about interrupt handlers 925151658Sjhb */ 926151658SjhbDB_SHOW_COMMAND(intr, db_show_intr) 927151658Sjhb{ 928151658Sjhb struct intr_event *ie; 929160312Sjhb int all, verbose; 930151658Sjhb 931151658Sjhb verbose = index(modif, 'v') != NULL; 932151658Sjhb all = index(modif, 'a') != NULL; 933151658Sjhb TAILQ_FOREACH(ie, &event_list, ie_list) { 934151658Sjhb if (!all && TAILQ_EMPTY(&ie->ie_handlers)) 935151658Sjhb continue; 936151658Sjhb db_dump_intr_event(ie, verbose); 937160312Sjhb if (db_pager_quit) 938160312Sjhb break; 939151658Sjhb } 940151658Sjhb} 941121482Sjhb#endif /* DDB */ 942121482Sjhb 943121482Sjhb/* 94467551Sjhb * Start standard software interrupt threads 94566698Sjhb */ 94667551Sjhbstatic void 94772237Sjhbstart_softintr(void *dummy) 94867551Sjhb{ 949113613Sjhb struct proc *p; 95072237Sjhb 951151658Sjhb if (swi_add(&clk_intr_event, "clock", softclock, NULL, SWI_CLOCK, 95272237Sjhb INTR_MPSAFE, &softclock_ih) || 953117128Sscottl swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih)) 95472237Sjhb panic("died while creating standard software ithreads"); 95572759Sjhb 956151658Sjhb p = clk_intr_event->ie_thread->it_thread->td_proc; 957113613Sjhb PROC_LOCK(p); 958113613Sjhb p->p_flag |= P_NOLOAD; 959113613Sjhb PROC_UNLOCK(p); 96066698Sjhb} 96172237SjhbSYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, NULL) 96266698Sjhb 963151658Sjhb/* 96477582Stmm * Sysctls used by systat and others: hw.intrnames and hw.intrcnt. 96577582Stmm * The data for this machine dependent, and the declarations are in machine 96677582Stmm * dependent code. The layout of intrnames and intrcnt however is machine 96777582Stmm * independent. 96877582Stmm * 96977582Stmm * We do not know the length of intrcnt and intrnames at compile time, so 97077582Stmm * calculate things at run time. 97177582Stmm */ 97277582Stmmstatic int 97377582Stmmsysctl_intrnames(SYSCTL_HANDLER_ARGS) 97477582Stmm{ 975151658Sjhb return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames, 97677582Stmm req)); 97777582Stmm} 97877582Stmm 97977582StmmSYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD, 98077582Stmm NULL, 0, sysctl_intrnames, "", "Interrupt Names"); 98177582Stmm 98277582Stmmstatic int 98377582Stmmsysctl_intrcnt(SYSCTL_HANDLER_ARGS) 98477582Stmm{ 985151658Sjhb return (sysctl_handle_opaque(oidp, intrcnt, 98677582Stmm (char *)eintrcnt - (char *)intrcnt, req)); 98777582Stmm} 98877582Stmm 98977582StmmSYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD, 99077582Stmm NULL, 0, sysctl_intrcnt, "", "Interrupt Counts"); 991121482Sjhb 992121482Sjhb#ifdef DDB 993121482Sjhb/* 994121482Sjhb * DDB command to dump the interrupt statistics. 995121482Sjhb */ 996121482SjhbDB_SHOW_COMMAND(intrcnt, db_show_intrcnt) 997121482Sjhb{ 998121482Sjhb u_long *i; 999121482Sjhb char *cp; 1000121482Sjhb 1001121482Sjhb cp = intrnames; 1002160312Sjhb for (i = intrcnt; i != eintrcnt && !db_pager_quit; i++) { 1003121482Sjhb if (*cp == '\0') 1004121482Sjhb break; 1005121482Sjhb if (*i != 0) 1006121482Sjhb db_printf("%s\t%lu\n", cp, *i); 1007121482Sjhb cp += strlen(cp) + 1; 1008121482Sjhb } 1009121482Sjhb} 1010121482Sjhb#endif 1011