kern_intr.c revision 157728
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 157728 2006-04-13 17:29:04Z 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 10272237Sjhbu_char 103151658Sjhbintr_priority(enum intr_type flags) 10465822Sjhb{ 10572237Sjhb u_char pri; 10665822Sjhb 10772237Sjhb flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET | 10878365Speter INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV); 10965822Sjhb switch (flags) { 11072237Sjhb case INTR_TYPE_TTY: 11165822Sjhb pri = PI_TTYLOW; 11265822Sjhb break; 11365822Sjhb case INTR_TYPE_BIO: 11465822Sjhb /* 11565822Sjhb * XXX We need to refine this. BSD/OS distinguishes 11665822Sjhb * between tape and disk priorities. 11765822Sjhb */ 11865822Sjhb pri = PI_DISK; 11965822Sjhb break; 12065822Sjhb case INTR_TYPE_NET: 12165822Sjhb pri = PI_NET; 12265822Sjhb break; 12365822Sjhb case INTR_TYPE_CAM: 12465822Sjhb pri = PI_DISK; /* XXX or PI_CAM? */ 12565822Sjhb break; 12678365Speter case INTR_TYPE_AV: /* Audio/video */ 12778365Speter pri = PI_AV; 12878365Speter break; 12972237Sjhb case INTR_TYPE_CLK: 13072237Sjhb pri = PI_REALTIME; 13172237Sjhb break; 13265822Sjhb case INTR_TYPE_MISC: 13365822Sjhb pri = PI_DULL; /* don't care */ 13465822Sjhb break; 13565822Sjhb default: 13672237Sjhb /* We didn't specify an interrupt level. */ 137151658Sjhb panic("intr_priority: no interrupt type in flags"); 13865822Sjhb } 13965822Sjhb 14065822Sjhb return pri; 14165822Sjhb} 14265822Sjhb 14372237Sjhb/* 144151658Sjhb * Update an ithread based on the associated intr_event. 14572237Sjhb */ 14672237Sjhbstatic void 147151658Sjhbithread_update(struct intr_thread *ithd) 14872237Sjhb{ 149151658Sjhb struct intr_event *ie; 15083366Sjulian struct thread *td; 151151658Sjhb u_char pri; 15267551Sjhb 153151658Sjhb ie = ithd->it_event; 154151658Sjhb td = ithd->it_thread; 15572237Sjhb 156151658Sjhb /* Determine the overall priority of this event. */ 157151658Sjhb if (TAILQ_EMPTY(&ie->ie_handlers)) 158151658Sjhb pri = PRI_MAX_ITHD; 159151658Sjhb else 160151658Sjhb pri = TAILQ_FIRST(&ie->ie_handlers)->ih_pri; 161105354Srobert 162151658Sjhb /* Update name and priority. */ 163151658Sjhb strlcpy(td->td_proc->p_comm, ie->ie_fullname, 164151658Sjhb sizeof(td->td_proc->p_comm)); 16594457Sjhb mtx_lock_spin(&sched_lock); 166151658Sjhb sched_prio(td, pri); 16794457Sjhb mtx_unlock_spin(&sched_lock); 168151658Sjhb} 169151658Sjhb 170151658Sjhb/* 171151658Sjhb * Regenerate the full name of an interrupt event and update its priority. 172151658Sjhb */ 173151658Sjhbstatic void 174151658Sjhbintr_event_update(struct intr_event *ie) 175151658Sjhb{ 176151658Sjhb struct intr_handler *ih; 177151658Sjhb char *last; 178151658Sjhb int missed, space; 179151658Sjhb 180151658Sjhb /* Start off with no entropy and just the name of the event. */ 181151658Sjhb mtx_assert(&ie->ie_lock, MA_OWNED); 182151658Sjhb strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 183151658Sjhb ie->ie_flags &= ~IE_ENTROPY; 184137267Sjhb missed = 0; 185151658Sjhb space = 1; 186151658Sjhb 187151658Sjhb /* Run through all the handlers updating values. */ 188151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 189151658Sjhb if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 < 190151658Sjhb sizeof(ie->ie_fullname)) { 191151658Sjhb strcat(ie->ie_fullname, " "); 192151658Sjhb strcat(ie->ie_fullname, ih->ih_name); 193151658Sjhb space = 0; 194137267Sjhb } else 195137267Sjhb missed++; 196137267Sjhb if (ih->ih_flags & IH_ENTROPY) 197151658Sjhb ie->ie_flags |= IE_ENTROPY; 198137267Sjhb } 199151658Sjhb 200151658Sjhb /* 201151658Sjhb * If the handler names were too long, add +'s to indicate missing 202151658Sjhb * names. If we run out of room and still have +'s to add, change 203151658Sjhb * the last character from a + to a *. 204151658Sjhb */ 205151658Sjhb last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2]; 206137267Sjhb while (missed-- > 0) { 207151658Sjhb if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) { 208151658Sjhb if (*last == '+') { 209151658Sjhb *last = '*'; 210151658Sjhb break; 211151658Sjhb } else 212151658Sjhb *last = '+'; 213151658Sjhb } else if (space) { 214151658Sjhb strcat(ie->ie_fullname, " +"); 215151658Sjhb space = 0; 21672237Sjhb } else 217151658Sjhb strcat(ie->ie_fullname, "+"); 21872237Sjhb } 219151658Sjhb 220151658Sjhb /* 221151658Sjhb * If this event has an ithread, update it's priority and 222151658Sjhb * name. 223151658Sjhb */ 224151658Sjhb if (ie->ie_thread != NULL) 225151658Sjhb ithread_update(ie->ie_thread); 226151658Sjhb CTR2(KTR_INTR, "%s: updated %s", __func__, ie->ie_fullname); 22772237Sjhb} 22872237Sjhb 22972237Sjhbint 230151658Sjhbintr_event_create(struct intr_event **event, void *source, int flags, 231151658Sjhb void (*enable)(void *), const char *fmt, ...) 23266698Sjhb{ 233151658Sjhb struct intr_event *ie; 23472237Sjhb va_list ap; 23572237Sjhb 236151658Sjhb /* The only valid flag during creation is IE_SOFT. */ 237151658Sjhb if ((flags & ~IE_SOFT) != 0) 23872759Sjhb return (EINVAL); 239151658Sjhb ie = malloc(sizeof(struct intr_event), M_ITHREAD, M_WAITOK | M_ZERO); 240151658Sjhb ie->ie_source = source; 241151658Sjhb ie->ie_enable = enable; 242151658Sjhb ie->ie_flags = flags; 243151658Sjhb TAILQ_INIT(&ie->ie_handlers); 244151658Sjhb mtx_init(&ie->ie_lock, "intr event", NULL, MTX_DEF); 24572759Sjhb 24672237Sjhb va_start(ap, fmt); 247151658Sjhb vsnprintf(ie->ie_name, sizeof(ie->ie_name), fmt, ap); 24872237Sjhb va_end(ap); 249151658Sjhb strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 250151658Sjhb mtx_pool_lock(mtxpool_sleep, &event_list); 251151658Sjhb TAILQ_INSERT_TAIL(&event_list, ie, ie_list); 252151658Sjhb mtx_pool_unlock(mtxpool_sleep, &event_list); 253151658Sjhb if (event != NULL) 254151658Sjhb *event = ie; 255151658Sjhb CTR2(KTR_INTR, "%s: created %s", __func__, ie->ie_name); 256151658Sjhb return (0); 257151658Sjhb} 25872237Sjhb 259151658Sjhbint 260151658Sjhbintr_event_destroy(struct intr_event *ie) 261151658Sjhb{ 262151658Sjhb 263151658Sjhb mtx_lock(&ie->ie_lock); 264151658Sjhb if (!TAILQ_EMPTY(&ie->ie_handlers)) { 265151658Sjhb mtx_unlock(&ie->ie_lock); 266151658Sjhb return (EBUSY); 267151658Sjhb } 268151658Sjhb mtx_pool_lock(mtxpool_sleep, &event_list); 269151658Sjhb TAILQ_REMOVE(&event_list, ie, ie_list); 270151658Sjhb mtx_pool_unlock(mtxpool_sleep, &event_list); 271157728Sjhb#ifndef notyet 272157728Sjhb if (ie->ie_thread != NULL) { 273157728Sjhb ithread_destroy(ie->ie_thread); 274157728Sjhb ie->ie_thread = NULL; 275157728Sjhb } 276157728Sjhb#endif 277151658Sjhb mtx_unlock(&ie->ie_lock); 278151658Sjhb mtx_destroy(&ie->ie_lock); 279151658Sjhb free(ie, M_ITHREAD); 280151658Sjhb return (0); 281151658Sjhb} 282151658Sjhb 283151658Sjhbstatic struct intr_thread * 284151658Sjhbithread_create(const char *name) 285151658Sjhb{ 286151658Sjhb struct intr_thread *ithd; 287151658Sjhb struct thread *td; 288151658Sjhb struct proc *p; 289151658Sjhb int error; 290151658Sjhb 291151658Sjhb ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); 292151658Sjhb 29372237Sjhb error = kthread_create(ithread_loop, ithd, &p, RFSTOPPED | RFHIGHPID, 294151658Sjhb 0, "%s", name); 295151658Sjhb if (error) 296151658Sjhb panic("kthread_create() failed with %d", error); 29790361Sjulian td = FIRST_THREAD_IN_PROC(p); /* XXXKSE */ 298113629Sjhb mtx_lock_spin(&sched_lock); 29990538Sjulian td->td_ksegrp->kg_pri_class = PRI_ITHD; 300103216Sjulian TD_SET_IWAIT(td); 301113629Sjhb mtx_unlock_spin(&sched_lock); 302151658Sjhb td->td_pflags |= TDP_ITHREAD; 303151658Sjhb ithd->it_thread = td; 304151658Sjhb CTR2(KTR_INTR, "%s: created %s", __func__, name); 305151658Sjhb return (ithd); 30672237Sjhb} 30772237Sjhb 308151658Sjhbstatic void 309151658Sjhbithread_destroy(struct intr_thread *ithread) 31072237Sjhb{ 31183366Sjulian struct thread *td; 31272237Sjhb 313157728Sjhb CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_name); 314151658Sjhb td = ithread->it_thread; 315151658Sjhb mtx_lock_spin(&sched_lock); 31676771Sjhb ithread->it_flags |= IT_DEAD; 317103216Sjulian if (TD_AWAITING_INTR(td)) { 318103216Sjulian TD_CLR_IWAIT(td); 319134586Sjulian setrunqueue(td, SRQ_INTR); 32072237Sjhb } 32172237Sjhb mtx_unlock_spin(&sched_lock); 32272237Sjhb} 32372237Sjhb 32472237Sjhbint 325151658Sjhbintr_event_add_handler(struct intr_event *ie, const char *name, 32672237Sjhb driver_intr_t handler, void *arg, u_char pri, enum intr_type flags, 32772237Sjhb void **cookiep) 32872237Sjhb{ 329151658Sjhb struct intr_handler *ih, *temp_ih; 330151658Sjhb struct intr_thread *it; 33172237Sjhb 332151658Sjhb if (ie == NULL || name == NULL || handler == NULL) 33372237Sjhb return (EINVAL); 33472237Sjhb 335151658Sjhb /* Allocate and populate an interrupt handler structure. */ 336151658Sjhb ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); 33772237Sjhb ih->ih_handler = handler; 33872237Sjhb ih->ih_argument = arg; 33972237Sjhb ih->ih_name = name; 340151658Sjhb ih->ih_event = ie; 34172237Sjhb ih->ih_pri = pri; 34272237Sjhb if (flags & INTR_FAST) 343122002Sjhb ih->ih_flags = IH_FAST; 34472237Sjhb else if (flags & INTR_EXCL) 34572237Sjhb ih->ih_flags = IH_EXCLUSIVE; 34672237Sjhb if (flags & INTR_MPSAFE) 34772237Sjhb ih->ih_flags |= IH_MPSAFE; 34872237Sjhb if (flags & INTR_ENTROPY) 34972237Sjhb ih->ih_flags |= IH_ENTROPY; 35072237Sjhb 351151658Sjhb /* We can only have one exclusive handler in a event. */ 352151658Sjhb mtx_lock(&ie->ie_lock); 353151658Sjhb if (!TAILQ_EMPTY(&ie->ie_handlers)) { 354151658Sjhb if ((flags & INTR_EXCL) || 355151658Sjhb (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { 356151658Sjhb mtx_unlock(&ie->ie_lock); 357151658Sjhb free(ih, M_ITHREAD); 358151658Sjhb return (EINVAL); 359151658Sjhb } 360122002Sjhb } 36172237Sjhb 362151658Sjhb /* Add the new handler to the event in priority order. */ 363151658Sjhb TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { 364151658Sjhb if (temp_ih->ih_pri > ih->ih_pri) 365151658Sjhb break; 366151658Sjhb } 36772237Sjhb if (temp_ih == NULL) 368151658Sjhb TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); 36972237Sjhb else 37072237Sjhb TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); 371151658Sjhb intr_event_update(ie); 37272237Sjhb 373151658Sjhb /* Create a thread if we need one. */ 374151658Sjhb while (ie->ie_thread == NULL && !(flags & INTR_FAST)) { 375151658Sjhb if (ie->ie_flags & IE_ADDING_THREAD) 376151658Sjhb msleep(ie, &ie->ie_lock, curthread->td_priority, 377151658Sjhb "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 39972237Sjhbint 400151658Sjhbintr_event_remove_handler(void *cookie) 40172237Sjhb{ 402151658Sjhb struct intr_handler *handler = (struct intr_handler *)cookie; 403151658Sjhb struct intr_event *ie; 40472237Sjhb#ifdef INVARIANTS 405151658Sjhb struct intr_handler *ih; 40672237Sjhb#endif 407151658Sjhb#ifdef notyet 408151658Sjhb int dead; 409151658Sjhb#endif 41072237Sjhb 41172759Sjhb if (handler == NULL) 41272237Sjhb return (EINVAL); 413151658Sjhb ie = handler->ih_event; 414151658Sjhb KASSERT(ie != NULL, 415151658Sjhb ("interrupt handler \"%s\" has a NULL interrupt event", 41672759Sjhb handler->ih_name)); 417151658Sjhb mtx_lock(&ie->ie_lock); 41887593Sobrien CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, 419151658Sjhb ie->ie_name); 42072237Sjhb#ifdef INVARIANTS 421151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 42272759Sjhb if (ih == handler) 42372759Sjhb goto ok; 424151658Sjhb mtx_unlock(&ie->ie_lock); 425151658Sjhb panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", 426151658Sjhb ih->ih_name, ie->ie_name); 42772759Sjhbok: 42872237Sjhb#endif 42972839Sjhb /* 430151658Sjhb * If there is no ithread, then just remove the handler and return. 431151658Sjhb * XXX: Note that an INTR_FAST handler might be running on another 432151658Sjhb * CPU! 433151658Sjhb */ 434151658Sjhb if (ie->ie_thread == NULL) { 435151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 436151658Sjhb mtx_unlock(&ie->ie_lock); 437151658Sjhb free(handler, M_ITHREAD); 438151658Sjhb return (0); 439151658Sjhb } 440151658Sjhb 441151658Sjhb /* 44272839Sjhb * If the interrupt thread is already running, then just mark this 44372839Sjhb * handler as being dead and let the ithread do the actual removal. 444124505Struckman * 445124505Struckman * During a cold boot while cold is set, msleep() does not sleep, 446124505Struckman * so we have to remove the handler here rather than letting the 447124505Struckman * thread do it. 44872839Sjhb */ 44972839Sjhb mtx_lock_spin(&sched_lock); 450151658Sjhb if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) { 45172839Sjhb handler->ih_flags |= IH_DEAD; 45272839Sjhb 45372839Sjhb /* 45472839Sjhb * Ensure that the thread will process the handler list 45572839Sjhb * again and remove this handler if it has already passed 45672839Sjhb * it on the list. 45772839Sjhb */ 458151658Sjhb ie->ie_thread->it_need = 1; 459151658Sjhb } else 460151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 46172839Sjhb mtx_unlock_spin(&sched_lock); 462151658Sjhb while (handler->ih_flags & IH_DEAD) 463151658Sjhb msleep(handler, &ie->ie_lock, curthread->td_priority, "iev_rmh", 464151658Sjhb 0); 465151658Sjhb intr_event_update(ie); 466151658Sjhb#ifdef notyet 467151658Sjhb /* 468151658Sjhb * XXX: This could be bad in the case of ppbus(8). Also, I think 469151658Sjhb * this could lead to races of stale data when servicing an 470151658Sjhb * interrupt. 471151658Sjhb */ 472151658Sjhb dead = 1; 473151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 474151658Sjhb if (!(ih->ih_flags & IH_FAST)) { 475151658Sjhb dead = 0; 476151658Sjhb break; 477151658Sjhb } 478151658Sjhb } 479151658Sjhb if (dead) { 480151658Sjhb ithread_destroy(ie->ie_thread); 481151658Sjhb ie->ie_thread = NULL; 482151658Sjhb } 483151658Sjhb#endif 484151658Sjhb mtx_unlock(&ie->ie_lock); 48576771Sjhb free(handler, M_ITHREAD); 48672237Sjhb return (0); 48772237Sjhb} 48872237Sjhb 48972237Sjhbint 490151658Sjhbintr_event_schedule_thread(struct intr_event *ie) 49172759Sjhb{ 492151658Sjhb struct intr_entropy entropy; 493151658Sjhb struct intr_thread *it; 49483366Sjulian struct thread *td; 495101176Sjulian struct thread *ctd; 49672759Sjhb struct proc *p; 49772759Sjhb 49872759Sjhb /* 49972759Sjhb * If no ithread or no handlers, then we have a stray interrupt. 50072759Sjhb */ 501151658Sjhb if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || 502151658Sjhb ie->ie_thread == NULL) 50372759Sjhb return (EINVAL); 50472759Sjhb 505101176Sjulian ctd = curthread; 506151658Sjhb it = ie->ie_thread; 507151658Sjhb td = it->it_thread; 508133191Srwatson p = td->td_proc; 509151658Sjhb 51072759Sjhb /* 51172759Sjhb * If any of the handlers for this ithread claim to be good 51272759Sjhb * sources of entropy, then gather some. 51372759Sjhb */ 514151658Sjhb if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) { 515133191Srwatson CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__, 516133191Srwatson p->p_pid, p->p_comm); 517151658Sjhb entropy.event = (uintptr_t)ie; 518151658Sjhb entropy.td = ctd; 51972759Sjhb random_harvest(&entropy, sizeof(entropy), 2, 0, 52072759Sjhb RANDOM_INTERRUPT); 52172759Sjhb } 52272759Sjhb 523151658Sjhb KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); 52472759Sjhb 52572759Sjhb /* 52672759Sjhb * Set it_need to tell the thread to keep running if it is already 52772759Sjhb * running. Then, grab sched_lock and see if we actually need to 528131481Sjhb * put this thread on the runqueue. 52972759Sjhb */ 530151658Sjhb it->it_need = 1; 53172759Sjhb mtx_lock_spin(&sched_lock); 532103216Sjulian if (TD_AWAITING_INTR(td)) { 533151658Sjhb CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, 534151658Sjhb p->p_comm); 535103216Sjulian TD_CLR_IWAIT(td); 536134586Sjulian setrunqueue(td, SRQ_INTR); 53772759Sjhb } else { 538151658Sjhb CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", 539151658Sjhb __func__, p->p_pid, p->p_comm, it->it_need, td->td_state); 54072759Sjhb } 54172759Sjhb mtx_unlock_spin(&sched_lock); 54272759Sjhb 54372759Sjhb return (0); 54472759Sjhb} 54572759Sjhb 546151699Sjhb/* 547151699Sjhb * Add a software interrupt handler to a specified event. If a given event 548151699Sjhb * is not specified, then a new event is created. 549151699Sjhb */ 55072759Sjhbint 551151658Sjhbswi_add(struct intr_event **eventp, const char *name, driver_intr_t handler, 55272237Sjhb void *arg, int pri, enum intr_type flags, void **cookiep) 55372237Sjhb{ 554151658Sjhb struct intr_event *ie; 55572237Sjhb int error; 55666698Sjhb 55772759Sjhb if (flags & (INTR_FAST | INTR_ENTROPY)) 55872759Sjhb return (EINVAL); 55972759Sjhb 560151658Sjhb ie = (eventp != NULL) ? *eventp : NULL; 56166698Sjhb 562151658Sjhb if (ie != NULL) { 563151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 564151658Sjhb return (EINVAL); 56572759Sjhb } else { 566151658Sjhb error = intr_event_create(&ie, NULL, IE_SOFT, NULL, 56772237Sjhb "swi%d:", pri); 56867551Sjhb if (error) 56972237Sjhb return (error); 570151658Sjhb if (eventp != NULL) 571151658Sjhb *eventp = ie; 57266698Sjhb } 573151658Sjhb return (intr_event_add_handler(ie, name, handler, arg, 57472376Sjake (pri * RQ_PPQ) + PI_SOFT, flags, cookiep)); 575134791Sjulian /* XXKSE.. think of a better way to get separate queues */ 57666698Sjhb} 57766698Sjhb 57866698Sjhb/* 579151658Sjhb * Schedule a software interrupt thread. 58066698Sjhb */ 58167551Sjhbvoid 58272237Sjhbswi_sched(void *cookie, int flags) 58366698Sjhb{ 584151658Sjhb struct intr_handler *ih = (struct intr_handler *)cookie; 585151658Sjhb struct intr_event *ie = ih->ih_event; 58672759Sjhb int error; 58766698Sjhb 588144971Sjhb PCPU_LAZY_INC(cnt.v_intr); 58967551Sjhb 590151658Sjhb CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name, 591151658Sjhb ih->ih_need); 592151658Sjhb 59367551Sjhb /* 59472759Sjhb * Set ih_need for this handler so that if the ithread is already 59572759Sjhb * running it will execute this handler on the next pass. Otherwise, 59672759Sjhb * it will execute it the next time it runs. 59767551Sjhb */ 59872237Sjhb atomic_store_rel_int(&ih->ih_need, 1); 59972237Sjhb if (!(flags & SWI_DELAY)) { 600151658Sjhb error = intr_event_schedule_thread(ie); 60172759Sjhb KASSERT(error == 0, ("stray software interrupt")); 60266698Sjhb } 60366698Sjhb} 60466698Sjhb 605151699Sjhb/* 606151699Sjhb * Remove a software interrupt handler. Currently this code does not 607151699Sjhb * remove the associated interrupt event if it becomes empty. Calling code 608151699Sjhb * may do so manually via intr_event_destroy(), but that's not really 609151699Sjhb * an optimal interface. 610151699Sjhb */ 611151699Sjhbint 612151699Sjhbswi_remove(void *cookie) 613151699Sjhb{ 614151699Sjhb 615151699Sjhb return (intr_event_remove_handler(cookie)); 616151699Sjhb} 617151699Sjhb 618151658Sjhbstatic void 619151658Sjhbithread_execute_handlers(struct proc *p, struct intr_event *ie) 620151658Sjhb{ 621151658Sjhb struct intr_handler *ih, *ihn; 622151658Sjhb 623151658Sjhb /* Interrupt handlers should not sleep. */ 624151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 625151658Sjhb THREAD_NO_SLEEPING(); 626151658Sjhb TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) { 627151658Sjhb 628151658Sjhb /* 629151658Sjhb * If this handler is marked for death, remove it from 630151658Sjhb * the list of handlers and wake up the sleeper. 631151658Sjhb */ 632151658Sjhb if (ih->ih_flags & IH_DEAD) { 633151658Sjhb mtx_lock(&ie->ie_lock); 634151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); 635151658Sjhb ih->ih_flags &= ~IH_DEAD; 636151658Sjhb wakeup(ih); 637151658Sjhb mtx_unlock(&ie->ie_lock); 638151658Sjhb continue; 639151658Sjhb } 640151658Sjhb 641151658Sjhb /* 642151658Sjhb * For software interrupt threads, we only execute 643151658Sjhb * handlers that have their need flag set. Hardware 644151658Sjhb * interrupt threads always invoke all of their handlers. 645151658Sjhb */ 646151658Sjhb if (ie->ie_flags & IE_SOFT) { 647151658Sjhb if (!ih->ih_need) 648151658Sjhb continue; 649151658Sjhb else 650151658Sjhb atomic_store_rel_int(&ih->ih_need, 0); 651151658Sjhb } 652151658Sjhb 653151658Sjhb /* Fast handlers are handled in primary interrupt context. */ 654151658Sjhb if (ih->ih_flags & IH_FAST) 655151658Sjhb continue; 656151658Sjhb 657151658Sjhb /* Execute this handler. */ 658151658Sjhb CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", 659151658Sjhb __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument, 660151658Sjhb ih->ih_name, ih->ih_flags); 661151658Sjhb 662151658Sjhb if (!(ih->ih_flags & IH_MPSAFE)) 663151658Sjhb mtx_lock(&Giant); 664151658Sjhb ih->ih_handler(ih->ih_argument); 665151658Sjhb if (!(ih->ih_flags & IH_MPSAFE)) 666151658Sjhb mtx_unlock(&Giant); 667151658Sjhb } 668151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 669151658Sjhb THREAD_SLEEPING_OK(); 670151658Sjhb 671151658Sjhb /* 672151658Sjhb * Interrupt storm handling: 673151658Sjhb * 674151658Sjhb * If this interrupt source is currently storming, then throttle 675151658Sjhb * it to only fire the handler once per clock tick. 676151658Sjhb * 677151658Sjhb * If this interrupt source is not currently storming, but the 678151658Sjhb * number of back to back interrupts exceeds the storm threshold, 679151658Sjhb * then enter storming mode. 680151658Sjhb */ 681151658Sjhb if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold) { 682151658Sjhb if (ie->ie_warned == 0) { 683151658Sjhb printf( 684151658Sjhb "Interrupt storm detected on \"%s\"; throttling interrupt source\n", 685151658Sjhb ie->ie_name); 686151658Sjhb ie->ie_warned = 1; 687151658Sjhb } 688151658Sjhb tsleep(&ie->ie_count, curthread->td_priority, "istorm", 1); 689151658Sjhb } else 690151658Sjhb ie->ie_count++; 691151658Sjhb 692151658Sjhb /* 693151658Sjhb * Now that all the handlers have had a chance to run, reenable 694151658Sjhb * the interrupt source. 695151658Sjhb */ 696151658Sjhb if (ie->ie_enable != NULL) 697151658Sjhb ie->ie_enable(ie->ie_source); 698151658Sjhb} 699151658Sjhb 70066698Sjhb/* 70172237Sjhb * This is the main code for interrupt threads. 70266698Sjhb */ 703104094Sphkstatic void 70472237Sjhbithread_loop(void *arg) 70566698Sjhb{ 706151658Sjhb struct intr_thread *ithd; 707151658Sjhb struct intr_event *ie; 70883366Sjulian struct thread *td; 70972237Sjhb struct proc *p; 710151658Sjhb 71183366Sjulian td = curthread; 71283366Sjulian p = td->td_proc; 713151658Sjhb ithd = (struct intr_thread *)arg; 714151658Sjhb KASSERT(ithd->it_thread == td, 71587593Sobrien ("%s: ithread and proc linkage out of sync", __func__)); 716151658Sjhb ie = ithd->it_event; 717151658Sjhb ie->ie_count = 0; 71866698Sjhb 71967551Sjhb /* 72067551Sjhb * As long as we have interrupts outstanding, go through the 72167551Sjhb * list of handlers, giving each one a go at it. 72267551Sjhb */ 72366698Sjhb for (;;) { 72472237Sjhb /* 72572237Sjhb * If we are an orphaned thread, then just die. 72672237Sjhb */ 72772237Sjhb if (ithd->it_flags & IT_DEAD) { 728151658Sjhb CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, 72972237Sjhb p->p_pid, p->p_comm); 73072237Sjhb free(ithd, M_ITHREAD); 73172237Sjhb kthread_exit(0); 73272237Sjhb } 73372237Sjhb 734151658Sjhb /* 735151658Sjhb * Service interrupts. If another interrupt arrives while 736151658Sjhb * we are running, it will set it_need to note that we 737151658Sjhb * should make another pass. 738151658Sjhb */ 73972237Sjhb while (ithd->it_need) { 74067551Sjhb /* 741151658Sjhb * This might need a full read and write barrier 742151658Sjhb * to make sure that this write posts before any 743151658Sjhb * of the memory or device accesses in the 744151658Sjhb * handlers. 74567551Sjhb */ 74672237Sjhb atomic_store_rel_int(&ithd->it_need, 0); 747151658Sjhb ithread_execute_handlers(p, ie); 74866698Sjhb } 749128331Sjhb WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); 750128331Sjhb mtx_assert(&Giant, MA_NOTOWNED); 75167551Sjhb 75266698Sjhb /* 75366698Sjhb * Processed all our interrupts. Now get the sched 75467551Sjhb * lock. This may take a while and it_need may get 75566698Sjhb * set again, so we have to check it again. 75666698Sjhb */ 75772200Sbmilekic mtx_lock_spin(&sched_lock); 758151658Sjhb if (!ithd->it_need && !(ithd->it_flags & IT_DEAD)) { 759128331Sjhb TD_SET_IWAIT(td); 760151658Sjhb ie->ie_count = 0; 761131473Sjhb mi_switch(SW_VOL, NULL); 76266698Sjhb } 76372200Sbmilekic mtx_unlock_spin(&sched_lock); 76466698Sjhb } 76566698Sjhb} 76666698Sjhb 767121482Sjhb#ifdef DDB 76872237Sjhb/* 769121482Sjhb * Dump details about an interrupt handler 770121482Sjhb */ 771121482Sjhbstatic void 772151658Sjhbdb_dump_intrhand(struct intr_handler *ih) 773121482Sjhb{ 774121482Sjhb int comma; 775121482Sjhb 776121482Sjhb db_printf("\t%-10s ", ih->ih_name); 777121482Sjhb switch (ih->ih_pri) { 778121482Sjhb case PI_REALTIME: 779121482Sjhb db_printf("CLK "); 780121482Sjhb break; 781121482Sjhb case PI_AV: 782121482Sjhb db_printf("AV "); 783121482Sjhb break; 784121482Sjhb case PI_TTYHIGH: 785121482Sjhb case PI_TTYLOW: 786121482Sjhb db_printf("TTY "); 787121482Sjhb break; 788121482Sjhb case PI_TAPE: 789121482Sjhb db_printf("TAPE"); 790121482Sjhb break; 791121482Sjhb case PI_NET: 792121482Sjhb db_printf("NET "); 793121482Sjhb break; 794121482Sjhb case PI_DISK: 795121482Sjhb case PI_DISKLOW: 796121482Sjhb db_printf("DISK"); 797121482Sjhb break; 798121482Sjhb case PI_DULL: 799121482Sjhb db_printf("DULL"); 800121482Sjhb break; 801121482Sjhb default: 802121482Sjhb if (ih->ih_pri >= PI_SOFT) 803121482Sjhb db_printf("SWI "); 804121482Sjhb else 805121482Sjhb db_printf("%4u", ih->ih_pri); 806121482Sjhb break; 807121482Sjhb } 808121482Sjhb db_printf(" "); 809121482Sjhb db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC); 810121482Sjhb db_printf("(%p)", ih->ih_argument); 811121482Sjhb if (ih->ih_need || 812121482Sjhb (ih->ih_flags & (IH_FAST | IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD | 813121482Sjhb IH_MPSAFE)) != 0) { 814121482Sjhb db_printf(" {"); 815121482Sjhb comma = 0; 816121482Sjhb if (ih->ih_flags & IH_FAST) { 817121482Sjhb db_printf("FAST"); 818121482Sjhb comma = 1; 819121482Sjhb } 820121482Sjhb if (ih->ih_flags & IH_EXCLUSIVE) { 821121482Sjhb if (comma) 822121482Sjhb db_printf(", "); 823121482Sjhb db_printf("EXCL"); 824121482Sjhb comma = 1; 825121482Sjhb } 826121482Sjhb if (ih->ih_flags & IH_ENTROPY) { 827121482Sjhb if (comma) 828121482Sjhb db_printf(", "); 829121482Sjhb db_printf("ENTROPY"); 830121482Sjhb comma = 1; 831121482Sjhb } 832121482Sjhb if (ih->ih_flags & IH_DEAD) { 833121482Sjhb if (comma) 834121482Sjhb db_printf(", "); 835121482Sjhb db_printf("DEAD"); 836121482Sjhb comma = 1; 837121482Sjhb } 838121482Sjhb if (ih->ih_flags & IH_MPSAFE) { 839121482Sjhb if (comma) 840121482Sjhb db_printf(", "); 841121482Sjhb db_printf("MPSAFE"); 842121482Sjhb comma = 1; 843121482Sjhb } 844121482Sjhb if (ih->ih_need) { 845121482Sjhb if (comma) 846121482Sjhb db_printf(", "); 847121482Sjhb db_printf("NEED"); 848121482Sjhb } 849121482Sjhb db_printf("}"); 850121482Sjhb } 851121482Sjhb db_printf("\n"); 852121482Sjhb} 853121482Sjhb 854121482Sjhb/* 855151658Sjhb * Dump details about a event. 856121482Sjhb */ 857121482Sjhbvoid 858151658Sjhbdb_dump_intr_event(struct intr_event *ie, int handlers) 859121482Sjhb{ 860151658Sjhb struct intr_handler *ih; 861151658Sjhb struct intr_thread *it; 862121482Sjhb int comma; 863121482Sjhb 864151658Sjhb db_printf("%s ", ie->ie_fullname); 865151658Sjhb it = ie->ie_thread; 866151658Sjhb if (it != NULL) 867151658Sjhb db_printf("(pid %d)", it->it_thread->td_proc->p_pid); 868151658Sjhb else 869151658Sjhb db_printf("(no thread)"); 870151658Sjhb if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 || 871151658Sjhb (it != NULL && it->it_need)) { 872121482Sjhb db_printf(" {"); 873121482Sjhb comma = 0; 874151658Sjhb if (ie->ie_flags & IE_SOFT) { 875121482Sjhb db_printf("SOFT"); 876121482Sjhb comma = 1; 877121482Sjhb } 878151658Sjhb if (ie->ie_flags & IE_ENTROPY) { 879121482Sjhb if (comma) 880121482Sjhb db_printf(", "); 881121482Sjhb db_printf("ENTROPY"); 882121482Sjhb comma = 1; 883121482Sjhb } 884151658Sjhb if (ie->ie_flags & IE_ADDING_THREAD) { 885121482Sjhb if (comma) 886121482Sjhb db_printf(", "); 887151658Sjhb db_printf("ADDING_THREAD"); 888121482Sjhb comma = 1; 889121482Sjhb } 890151658Sjhb if (it != NULL && it->it_need) { 891121482Sjhb if (comma) 892121482Sjhb db_printf(", "); 893121482Sjhb db_printf("NEED"); 894121482Sjhb } 895121482Sjhb db_printf("}"); 896121482Sjhb } 897121482Sjhb db_printf("\n"); 898121482Sjhb 899121482Sjhb if (handlers) 900151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 901121482Sjhb db_dump_intrhand(ih); 902121482Sjhb} 903151658Sjhb 904151658Sjhb/* 905151658Sjhb * Dump data about interrupt handlers 906151658Sjhb */ 907151658SjhbDB_SHOW_COMMAND(intr, db_show_intr) 908151658Sjhb{ 909151658Sjhb struct intr_event *ie; 910151658Sjhb int quit, all, verbose; 911151658Sjhb 912151658Sjhb quit = 0; 913151658Sjhb verbose = index(modif, 'v') != NULL; 914151658Sjhb all = index(modif, 'a') != NULL; 915151658Sjhb db_setup_paging(db_simple_pager, &quit, db_lines_per_page); 916151658Sjhb TAILQ_FOREACH(ie, &event_list, ie_list) { 917151658Sjhb if (!all && TAILQ_EMPTY(&ie->ie_handlers)) 918151658Sjhb continue; 919151658Sjhb db_dump_intr_event(ie, verbose); 920151658Sjhb } 921151658Sjhb} 922121482Sjhb#endif /* DDB */ 923121482Sjhb 924121482Sjhb/* 92567551Sjhb * Start standard software interrupt threads 92666698Sjhb */ 92767551Sjhbstatic void 92872237Sjhbstart_softintr(void *dummy) 92967551Sjhb{ 930113613Sjhb struct proc *p; 93172237Sjhb 932151658Sjhb if (swi_add(&clk_intr_event, "clock", softclock, NULL, SWI_CLOCK, 93372237Sjhb INTR_MPSAFE, &softclock_ih) || 934117128Sscottl swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih)) 93572237Sjhb panic("died while creating standard software ithreads"); 93672759Sjhb 937151658Sjhb p = clk_intr_event->ie_thread->it_thread->td_proc; 938113613Sjhb PROC_LOCK(p); 939113613Sjhb p->p_flag |= P_NOLOAD; 940113613Sjhb PROC_UNLOCK(p); 94166698Sjhb} 94272237SjhbSYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, NULL) 94366698Sjhb 944151658Sjhb/* 94577582Stmm * Sysctls used by systat and others: hw.intrnames and hw.intrcnt. 94677582Stmm * The data for this machine dependent, and the declarations are in machine 94777582Stmm * dependent code. The layout of intrnames and intrcnt however is machine 94877582Stmm * independent. 94977582Stmm * 95077582Stmm * We do not know the length of intrcnt and intrnames at compile time, so 95177582Stmm * calculate things at run time. 95277582Stmm */ 95377582Stmmstatic int 95477582Stmmsysctl_intrnames(SYSCTL_HANDLER_ARGS) 95577582Stmm{ 956151658Sjhb return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames, 95777582Stmm req)); 95877582Stmm} 95977582Stmm 96077582StmmSYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD, 96177582Stmm NULL, 0, sysctl_intrnames, "", "Interrupt Names"); 96277582Stmm 96377582Stmmstatic int 96477582Stmmsysctl_intrcnt(SYSCTL_HANDLER_ARGS) 96577582Stmm{ 966151658Sjhb return (sysctl_handle_opaque(oidp, intrcnt, 96777582Stmm (char *)eintrcnt - (char *)intrcnt, req)); 96877582Stmm} 96977582Stmm 97077582StmmSYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD, 97177582Stmm NULL, 0, sysctl_intrcnt, "", "Interrupt Counts"); 972121482Sjhb 973121482Sjhb#ifdef DDB 974121482Sjhb/* 975121482Sjhb * DDB command to dump the interrupt statistics. 976121482Sjhb */ 977121482SjhbDB_SHOW_COMMAND(intrcnt, db_show_intrcnt) 978121482Sjhb{ 979121482Sjhb u_long *i; 980121482Sjhb char *cp; 981121482Sjhb int quit; 982121482Sjhb 983121482Sjhb cp = intrnames; 984137117Sjhb db_setup_paging(db_simple_pager, &quit, db_lines_per_page); 985121482Sjhb for (i = intrcnt, quit = 0; i != eintrcnt && !quit; i++) { 986121482Sjhb if (*cp == '\0') 987121482Sjhb break; 988121482Sjhb if (*i != 0) 989121482Sjhb db_printf("%s\t%lu\n", cp, *i); 990121482Sjhb cp += strlen(cp) + 1; 991121482Sjhb } 992121482Sjhb} 993121482Sjhb#endif 994