kern_intr.c revision 183298
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 183298 2008-09-23 14:25:56Z obrien $"); 2936887Sdfr 30121482Sjhb#include "opt_ddb.h" 31121482Sjhb 3241059Speter#include <sys/param.h> 3365822Sjhb#include <sys/bus.h> 34110860Salfred#include <sys/conf.h> 35178092Sjeff#include <sys/cpuset.h> 3665822Sjhb#include <sys/rtprio.h> 3741059Speter#include <sys/systm.h> 3866698Sjhb#include <sys/interrupt.h> 3966698Sjhb#include <sys/kernel.h> 4066698Sjhb#include <sys/kthread.h> 4166698Sjhb#include <sys/ktr.h> 42130128Sbde#include <sys/limits.h> 4374914Sjhb#include <sys/lock.h> 4426156Sse#include <sys/malloc.h> 4567365Sjhb#include <sys/mutex.h> 4666698Sjhb#include <sys/proc.h> 4772759Sjhb#include <sys/random.h> 4872237Sjhb#include <sys/resourcevar.h> 49139451Sjhb#include <sys/sched.h> 50177181Sjhb#include <sys/smp.h> 5177582Stmm#include <sys/sysctl.h> 52182024Skmacy#include <sys/syslog.h> 5366698Sjhb#include <sys/unistd.h> 5466698Sjhb#include <sys/vmmeter.h> 5566698Sjhb#include <machine/atomic.h> 5666698Sjhb#include <machine/cpu.h> 5767551Sjhb#include <machine/md_var.h> 5872237Sjhb#include <machine/stdarg.h> 59121482Sjhb#ifdef DDB 60121482Sjhb#include <ddb/ddb.h> 61121482Sjhb#include <ddb/db_sym.h> 62121482Sjhb#endif 6326156Sse 64151658Sjhb/* 65151658Sjhb * Describe an interrupt thread. There is one of these per interrupt event. 66151658Sjhb */ 67151658Sjhbstruct intr_thread { 68151658Sjhb struct intr_event *it_event; 69151658Sjhb struct thread *it_thread; /* Kernel thread. */ 70151658Sjhb int it_flags; /* (j) IT_* flags. */ 71151658Sjhb int it_need; /* Needs service. */ 7272759Sjhb}; 7372759Sjhb 74151658Sjhb/* Interrupt thread flags kept in it_flags */ 75151658Sjhb#define IT_DEAD 0x000001 /* Thread is waiting to exit. */ 76151658Sjhb 77151658Sjhbstruct intr_entropy { 78151658Sjhb struct thread *td; 79151658Sjhb uintptr_t event; 80151658Sjhb}; 81151658Sjhb 82151658Sjhbstruct intr_event *clk_intr_event; 83151658Sjhbstruct intr_event *tty_intr_event; 84128339Sbdevoid *vm_ih; 85173004Sjulianstruct proc *intrproc; 8638244Sbde 8772237Sjhbstatic MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads"); 8872237Sjhb 89168850Snjlstatic int intr_storm_threshold = 1000; 90128331SjhbTUNABLE_INT("hw.intr_storm_threshold", &intr_storm_threshold); 91128331SjhbSYSCTL_INT(_hw, OID_AUTO, intr_storm_threshold, CTLFLAG_RW, 92128331Sjhb &intr_storm_threshold, 0, 93128339Sbde "Number of consecutive interrupts before storm protection is enabled"); 94151658Sjhbstatic TAILQ_HEAD(, intr_event) event_list = 95151658Sjhb TAILQ_HEAD_INITIALIZER(event_list); 96178092Sjeffstatic struct mtx event_lock; 97178092SjeffMTX_SYSINIT(intr_event_list, &event_lock, "intr event list", MTX_DEF); 98128331Sjhb 99151658Sjhbstatic void intr_event_update(struct intr_event *ie); 100169320Spiso#ifdef INTR_FILTER 101177940Sjhbstatic int intr_event_schedule_thread(struct intr_event *ie, 102177940Sjhb struct intr_thread *ithd); 103177940Sjhbstatic int intr_filter_loop(struct intr_event *ie, 104177940Sjhb struct trapframe *frame, struct intr_thread **ithd); 105169320Spisostatic struct intr_thread *ithread_create(const char *name, 106169320Spiso struct intr_handler *ih); 107169320Spiso#else 108177940Sjhbstatic int intr_event_schedule_thread(struct intr_event *ie); 109151658Sjhbstatic struct intr_thread *ithread_create(const char *name); 110169320Spiso#endif 111151658Sjhbstatic void ithread_destroy(struct intr_thread *ithread); 112169320Spisostatic void ithread_execute_handlers(struct proc *p, 113169320Spiso struct intr_event *ie); 114169320Spiso#ifdef INTR_FILTER 115169320Spisostatic void priv_ithread_execute_handler(struct proc *p, 116169320Spiso struct intr_handler *ih); 117169320Spiso#endif 118128339Sbdestatic void ithread_loop(void *); 119151658Sjhbstatic void ithread_update(struct intr_thread *ithd); 120128339Sbdestatic void start_softintr(void *); 121128339Sbde 122165124Sjhb/* Map an interrupt type to an ithread priority. */ 12372237Sjhbu_char 124151658Sjhbintr_priority(enum intr_type flags) 12565822Sjhb{ 12672237Sjhb u_char pri; 12765822Sjhb 12872237Sjhb flags &= (INTR_TYPE_TTY | INTR_TYPE_BIO | INTR_TYPE_NET | 12978365Speter INTR_TYPE_CAM | INTR_TYPE_MISC | INTR_TYPE_CLK | INTR_TYPE_AV); 13065822Sjhb switch (flags) { 13172237Sjhb case INTR_TYPE_TTY: 13265822Sjhb pri = PI_TTYLOW; 13365822Sjhb break; 13465822Sjhb case INTR_TYPE_BIO: 13565822Sjhb /* 13665822Sjhb * XXX We need to refine this. BSD/OS distinguishes 13765822Sjhb * between tape and disk priorities. 13865822Sjhb */ 13965822Sjhb pri = PI_DISK; 14065822Sjhb break; 14165822Sjhb case INTR_TYPE_NET: 14265822Sjhb pri = PI_NET; 14365822Sjhb break; 14465822Sjhb case INTR_TYPE_CAM: 14565822Sjhb pri = PI_DISK; /* XXX or PI_CAM? */ 14665822Sjhb break; 14778365Speter case INTR_TYPE_AV: /* Audio/video */ 14878365Speter pri = PI_AV; 14978365Speter break; 15072237Sjhb case INTR_TYPE_CLK: 15172237Sjhb pri = PI_REALTIME; 15272237Sjhb break; 15365822Sjhb case INTR_TYPE_MISC: 15465822Sjhb pri = PI_DULL; /* don't care */ 15565822Sjhb break; 15665822Sjhb default: 15772237Sjhb /* We didn't specify an interrupt level. */ 158151658Sjhb panic("intr_priority: no interrupt type in flags"); 15965822Sjhb } 16065822Sjhb 16165822Sjhb return pri; 16265822Sjhb} 16365822Sjhb 16472237Sjhb/* 165151658Sjhb * Update an ithread based on the associated intr_event. 16672237Sjhb */ 16772237Sjhbstatic void 168151658Sjhbithread_update(struct intr_thread *ithd) 16972237Sjhb{ 170151658Sjhb struct intr_event *ie; 17183366Sjulian struct thread *td; 172151658Sjhb u_char pri; 17367551Sjhb 174151658Sjhb ie = ithd->it_event; 175151658Sjhb td = ithd->it_thread; 17672237Sjhb 177151658Sjhb /* Determine the overall priority of this event. */ 178151658Sjhb if (TAILQ_EMPTY(&ie->ie_handlers)) 179151658Sjhb pri = PRI_MAX_ITHD; 180151658Sjhb else 181151658Sjhb pri = TAILQ_FIRST(&ie->ie_handlers)->ih_pri; 182105354Srobert 183151658Sjhb /* Update name and priority. */ 184173004Sjulian strlcpy(td->td_name, ie->ie_fullname, sizeof(td->td_name)); 185170307Sjeff thread_lock(td); 186151658Sjhb sched_prio(td, pri); 187170307Sjeff thread_unlock(td); 188151658Sjhb} 189151658Sjhb 190151658Sjhb/* 191151658Sjhb * Regenerate the full name of an interrupt event and update its priority. 192151658Sjhb */ 193151658Sjhbstatic void 194151658Sjhbintr_event_update(struct intr_event *ie) 195151658Sjhb{ 196151658Sjhb struct intr_handler *ih; 197151658Sjhb char *last; 198151658Sjhb int missed, space; 199151658Sjhb 200151658Sjhb /* Start off with no entropy and just the name of the event. */ 201151658Sjhb mtx_assert(&ie->ie_lock, MA_OWNED); 202151658Sjhb strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 203151658Sjhb ie->ie_flags &= ~IE_ENTROPY; 204137267Sjhb missed = 0; 205151658Sjhb space = 1; 206151658Sjhb 207151658Sjhb /* Run through all the handlers updating values. */ 208151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 209151658Sjhb if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 < 210151658Sjhb sizeof(ie->ie_fullname)) { 211151658Sjhb strcat(ie->ie_fullname, " "); 212151658Sjhb strcat(ie->ie_fullname, ih->ih_name); 213151658Sjhb space = 0; 214137267Sjhb } else 215137267Sjhb missed++; 216137267Sjhb if (ih->ih_flags & IH_ENTROPY) 217151658Sjhb ie->ie_flags |= IE_ENTROPY; 218137267Sjhb } 219151658Sjhb 220151658Sjhb /* 221151658Sjhb * If the handler names were too long, add +'s to indicate missing 222151658Sjhb * names. If we run out of room and still have +'s to add, change 223151658Sjhb * the last character from a + to a *. 224151658Sjhb */ 225151658Sjhb last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2]; 226137267Sjhb while (missed-- > 0) { 227151658Sjhb if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) { 228151658Sjhb if (*last == '+') { 229151658Sjhb *last = '*'; 230151658Sjhb break; 231151658Sjhb } else 232151658Sjhb *last = '+'; 233151658Sjhb } else if (space) { 234151658Sjhb strcat(ie->ie_fullname, " +"); 235151658Sjhb space = 0; 23672237Sjhb } else 237151658Sjhb strcat(ie->ie_fullname, "+"); 23872237Sjhb } 239151658Sjhb 240151658Sjhb /* 241151658Sjhb * If this event has an ithread, update it's priority and 242151658Sjhb * name. 243151658Sjhb */ 244151658Sjhb if (ie->ie_thread != NULL) 245151658Sjhb ithread_update(ie->ie_thread); 246151658Sjhb CTR2(KTR_INTR, "%s: updated %s", __func__, ie->ie_fullname); 24772237Sjhb} 24872237Sjhb 24972237Sjhbint 250183298Sobrienintr_event_create(struct intr_event **event, void *source, int flags, int irq, 251177940Sjhb void (*pre_ithread)(void *), void (*post_ithread)(void *), 252177940Sjhb void (*post_filter)(void *), int (*assign_cpu)(void *, u_char), 253177940Sjhb const char *fmt, ...) 254169320Spiso{ 255169320Spiso struct intr_event *ie; 256169320Spiso va_list ap; 25772237Sjhb 258169320Spiso /* The only valid flag during creation is IE_SOFT. */ 259169320Spiso if ((flags & ~IE_SOFT) != 0) 260169320Spiso return (EINVAL); 261169320Spiso ie = malloc(sizeof(struct intr_event), M_ITHREAD, M_WAITOK | M_ZERO); 262169320Spiso ie->ie_source = source; 263177940Sjhb ie->ie_pre_ithread = pre_ithread; 264177940Sjhb ie->ie_post_ithread = post_ithread; 265177940Sjhb ie->ie_post_filter = post_filter; 266177181Sjhb ie->ie_assign_cpu = assign_cpu; 267169320Spiso ie->ie_flags = flags; 268178092Sjeff ie->ie_irq = irq; 269177181Sjhb ie->ie_cpu = NOCPU; 270169320Spiso TAILQ_INIT(&ie->ie_handlers); 271169320Spiso mtx_init(&ie->ie_lock, "intr event", NULL, MTX_DEF); 272169320Spiso 273169320Spiso va_start(ap, fmt); 274169320Spiso vsnprintf(ie->ie_name, sizeof(ie->ie_name), fmt, ap); 275169320Spiso va_end(ap); 276169320Spiso strlcpy(ie->ie_fullname, ie->ie_name, sizeof(ie->ie_fullname)); 277178092Sjeff mtx_lock(&event_lock); 278169320Spiso TAILQ_INSERT_TAIL(&event_list, ie, ie_list); 279178092Sjeff mtx_unlock(&event_lock); 280169320Spiso if (event != NULL) 281169320Spiso *event = ie; 282169320Spiso CTR2(KTR_INTR, "%s: created %s", __func__, ie->ie_name); 283169320Spiso return (0); 284169320Spiso} 285169320Spiso 286177181Sjhb/* 287177181Sjhb * Bind an interrupt event to the specified CPU. Note that not all 288177181Sjhb * platforms support binding an interrupt to a CPU. For those 289177181Sjhb * platforms this request will fail. For supported platforms, any 290177181Sjhb * associated ithreads as well as the primary interrupt context will 291177181Sjhb * be bound to the specificed CPU. Using a cpu id of NOCPU unbinds 292177181Sjhb * the interrupt event. 293177181Sjhb */ 294151658Sjhbint 295177181Sjhbintr_event_bind(struct intr_event *ie, u_char cpu) 296177181Sjhb{ 297178092Sjeff cpuset_t mask; 298178092Sjeff lwpid_t id; 299177181Sjhb int error; 300177181Sjhb 301177181Sjhb /* Need a CPU to bind to. */ 302177181Sjhb if (cpu != NOCPU && CPU_ABSENT(cpu)) 303177181Sjhb return (EINVAL); 304177181Sjhb 305177181Sjhb if (ie->ie_assign_cpu == NULL) 306177181Sjhb return (EOPNOTSUPP); 307178092Sjeff /* 308178092Sjeff * If we have any ithreads try to set their mask first since this 309178092Sjeff * can fail. 310178092Sjeff */ 311177181Sjhb mtx_lock(&ie->ie_lock); 312178092Sjeff if (ie->ie_thread != NULL) { 313178092Sjeff CPU_ZERO(&mask); 314178092Sjeff if (cpu == NOCPU) 315178092Sjeff CPU_COPY(cpuset_root, &mask); 316178092Sjeff else 317178092Sjeff CPU_SET(cpu, &mask); 318178092Sjeff id = ie->ie_thread->it_thread->td_tid; 319177181Sjhb mtx_unlock(&ie->ie_lock); 320178092Sjeff error = cpuset_setthread(id, &mask); 321178092Sjeff if (error) 322178092Sjeff return (error); 323178092Sjeff } else 324178092Sjeff mtx_unlock(&ie->ie_lock); 325177181Sjhb error = ie->ie_assign_cpu(ie->ie_source, cpu); 326177181Sjhb if (error) 327177181Sjhb return (error); 328177181Sjhb mtx_lock(&ie->ie_lock); 329177181Sjhb ie->ie_cpu = cpu; 330177181Sjhb mtx_unlock(&ie->ie_lock); 331178092Sjeff 332178092Sjeff return (error); 333178092Sjeff} 334178092Sjeff 335178092Sjeffstatic struct intr_event * 336178092Sjeffintr_lookup(int irq) 337178092Sjeff{ 338178092Sjeff struct intr_event *ie; 339178092Sjeff 340178092Sjeff mtx_lock(&event_lock); 341178092Sjeff TAILQ_FOREACH(ie, &event_list, ie_list) 342178092Sjeff if (ie->ie_irq == irq && 343178092Sjeff (ie->ie_flags & IE_SOFT) == 0 && 344178092Sjeff TAILQ_FIRST(&ie->ie_handlers) != NULL) 345178092Sjeff break; 346178092Sjeff mtx_unlock(&event_lock); 347178092Sjeff return (ie); 348178092Sjeff} 349178092Sjeff 350178092Sjeffint 351178092Sjeffintr_setaffinity(int irq, void *m) 352178092Sjeff{ 353178092Sjeff struct intr_event *ie; 354178092Sjeff cpuset_t *mask; 355178092Sjeff u_char cpu; 356178092Sjeff int n; 357178092Sjeff 358178092Sjeff mask = m; 359178092Sjeff cpu = NOCPU; 360178092Sjeff /* 361178092Sjeff * If we're setting all cpus we can unbind. Otherwise make sure 362178092Sjeff * only one cpu is in the set. 363178092Sjeff */ 364178092Sjeff if (CPU_CMP(cpuset_root, mask)) { 365178092Sjeff for (n = 0; n < CPU_SETSIZE; n++) { 366178092Sjeff if (!CPU_ISSET(n, mask)) 367178092Sjeff continue; 368178092Sjeff if (cpu != NOCPU) 369178092Sjeff return (EINVAL); 370178092Sjeff cpu = (u_char)n; 371178092Sjeff } 372178092Sjeff } 373178092Sjeff ie = intr_lookup(irq); 374178092Sjeff if (ie == NULL) 375178092Sjeff return (ESRCH); 376178092Sjeff intr_event_bind(ie, cpu); 377180099Sbz return (0); 378178092Sjeff} 379178092Sjeff 380178092Sjeffint 381178092Sjeffintr_getaffinity(int irq, void *m) 382178092Sjeff{ 383178092Sjeff struct intr_event *ie; 384178092Sjeff cpuset_t *mask; 385178092Sjeff 386178092Sjeff mask = m; 387178092Sjeff ie = intr_lookup(irq); 388178092Sjeff if (ie == NULL) 389178092Sjeff return (ESRCH); 390178092Sjeff CPU_ZERO(mask); 391178092Sjeff mtx_lock(&ie->ie_lock); 392178092Sjeff if (ie->ie_cpu == NOCPU) 393178092Sjeff CPU_COPY(cpuset_root, mask); 394178092Sjeff else 395178092Sjeff CPU_SET(ie->ie_cpu, mask); 396178092Sjeff mtx_unlock(&ie->ie_lock); 397177181Sjhb return (0); 398177181Sjhb} 399177181Sjhb 400177181Sjhbint 401151658Sjhbintr_event_destroy(struct intr_event *ie) 402151658Sjhb{ 403151658Sjhb 404178092Sjeff mtx_lock(&event_lock); 405151658Sjhb mtx_lock(&ie->ie_lock); 406151658Sjhb if (!TAILQ_EMPTY(&ie->ie_handlers)) { 407151658Sjhb mtx_unlock(&ie->ie_lock); 408178092Sjeff mtx_unlock(&event_lock); 409151658Sjhb return (EBUSY); 410151658Sjhb } 411151658Sjhb TAILQ_REMOVE(&event_list, ie, ie_list); 412157728Sjhb#ifndef notyet 413157728Sjhb if (ie->ie_thread != NULL) { 414157728Sjhb ithread_destroy(ie->ie_thread); 415157728Sjhb ie->ie_thread = NULL; 416157728Sjhb } 417157728Sjhb#endif 418151658Sjhb mtx_unlock(&ie->ie_lock); 419178092Sjeff mtx_unlock(&event_lock); 420151658Sjhb mtx_destroy(&ie->ie_lock); 421151658Sjhb free(ie, M_ITHREAD); 422151658Sjhb return (0); 423151658Sjhb} 424151658Sjhb 425169320Spiso#ifndef INTR_FILTER 426151658Sjhbstatic struct intr_thread * 427151658Sjhbithread_create(const char *name) 428151658Sjhb{ 429151658Sjhb struct intr_thread *ithd; 430151658Sjhb struct thread *td; 431151658Sjhb int error; 432151658Sjhb 433151658Sjhb ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); 434151658Sjhb 435173004Sjulian error = kproc_kthread_add(ithread_loop, ithd, &intrproc, 436173004Sjulian &td, RFSTOPPED | RFHIGHPID, 437173051Sjulian 0, "intr", "%s", name); 438151658Sjhb if (error) 439172836Sjulian panic("kproc_create() failed with %d", error); 440170307Sjeff thread_lock(td); 441164936Sjulian sched_class(td, PRI_ITHD); 442103216Sjulian TD_SET_IWAIT(td); 443170307Sjeff thread_unlock(td); 444151658Sjhb td->td_pflags |= TDP_ITHREAD; 445151658Sjhb ithd->it_thread = td; 446151658Sjhb CTR2(KTR_INTR, "%s: created %s", __func__, name); 447151658Sjhb return (ithd); 44872237Sjhb} 449169320Spiso#else 450169320Spisostatic struct intr_thread * 451169320Spisoithread_create(const char *name, struct intr_handler *ih) 452169320Spiso{ 453169320Spiso struct intr_thread *ithd; 454169320Spiso struct thread *td; 455169320Spiso int error; 45672237Sjhb 457169320Spiso ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO); 458169320Spiso 459173153Sjulian error = kproc_kthread_add(ithread_loop, ih, &intrproc, 460173004Sjulian &td, RFSTOPPED | RFHIGHPID, 461173051Sjulian 0, "intr", "%s", name); 462169320Spiso if (error) 463172836Sjulian panic("kproc_create() failed with %d", error); 464170307Sjeff thread_lock(td); 465169320Spiso sched_class(td, PRI_ITHD); 466169320Spiso TD_SET_IWAIT(td); 467170307Sjeff thread_unlock(td); 468169320Spiso td->td_pflags |= TDP_ITHREAD; 469169320Spiso ithd->it_thread = td; 470169320Spiso CTR2(KTR_INTR, "%s: created %s", __func__, name); 471169320Spiso return (ithd); 472169320Spiso} 473169320Spiso#endif 474169320Spiso 475151658Sjhbstatic void 476151658Sjhbithread_destroy(struct intr_thread *ithread) 47772237Sjhb{ 47883366Sjulian struct thread *td; 47972237Sjhb 480157784Sscottl CTR2(KTR_INTR, "%s: killing %s", __func__, ithread->it_event->ie_name); 481151658Sjhb td = ithread->it_thread; 482170307Sjeff thread_lock(td); 48376771Sjhb ithread->it_flags |= IT_DEAD; 484103216Sjulian if (TD_AWAITING_INTR(td)) { 485103216Sjulian TD_CLR_IWAIT(td); 486166188Sjeff sched_add(td, SRQ_INTR); 48772237Sjhb } 488170307Sjeff thread_unlock(td); 48972237Sjhb} 49072237Sjhb 491169320Spiso#ifndef INTR_FILTER 49272237Sjhbint 493151658Sjhbintr_event_add_handler(struct intr_event *ie, const char *name, 494166901Spiso driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri, 495166901Spiso enum intr_type flags, void **cookiep) 49672237Sjhb{ 497151658Sjhb struct intr_handler *ih, *temp_ih; 498151658Sjhb struct intr_thread *it; 49972237Sjhb 500166901Spiso if (ie == NULL || name == NULL || (handler == NULL && filter == NULL)) 50172237Sjhb return (EINVAL); 50272237Sjhb 503151658Sjhb /* Allocate and populate an interrupt handler structure. */ 504151658Sjhb ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); 505166901Spiso ih->ih_filter = filter; 50672237Sjhb ih->ih_handler = handler; 50772237Sjhb ih->ih_argument = arg; 50872237Sjhb ih->ih_name = name; 509151658Sjhb ih->ih_event = ie; 51072237Sjhb ih->ih_pri = pri; 511166901Spiso if (flags & INTR_EXCL) 51272237Sjhb ih->ih_flags = IH_EXCLUSIVE; 51372237Sjhb if (flags & INTR_MPSAFE) 51472237Sjhb ih->ih_flags |= IH_MPSAFE; 51572237Sjhb if (flags & INTR_ENTROPY) 51672237Sjhb ih->ih_flags |= IH_ENTROPY; 51772237Sjhb 518151658Sjhb /* We can only have one exclusive handler in a event. */ 519151658Sjhb mtx_lock(&ie->ie_lock); 520151658Sjhb if (!TAILQ_EMPTY(&ie->ie_handlers)) { 521151658Sjhb if ((flags & INTR_EXCL) || 522151658Sjhb (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { 523151658Sjhb mtx_unlock(&ie->ie_lock); 524151658Sjhb free(ih, M_ITHREAD); 525151658Sjhb return (EINVAL); 526151658Sjhb } 527122002Sjhb } 52872237Sjhb 529151658Sjhb /* Add the new handler to the event in priority order. */ 530151658Sjhb TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { 531151658Sjhb if (temp_ih->ih_pri > ih->ih_pri) 532151658Sjhb break; 533151658Sjhb } 53472237Sjhb if (temp_ih == NULL) 535151658Sjhb TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); 53672237Sjhb else 53772237Sjhb TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); 538151658Sjhb intr_event_update(ie); 53972237Sjhb 540151658Sjhb /* Create a thread if we need one. */ 541166901Spiso while (ie->ie_thread == NULL && handler != NULL) { 542151658Sjhb if (ie->ie_flags & IE_ADDING_THREAD) 543157815Sjhb msleep(ie, &ie->ie_lock, 0, "ithread", 0); 544151658Sjhb else { 545151658Sjhb ie->ie_flags |= IE_ADDING_THREAD; 546151658Sjhb mtx_unlock(&ie->ie_lock); 547151658Sjhb it = ithread_create("intr: newborn"); 548151658Sjhb mtx_lock(&ie->ie_lock); 549151658Sjhb ie->ie_flags &= ~IE_ADDING_THREAD; 550151658Sjhb ie->ie_thread = it; 551151658Sjhb it->it_event = ie; 552151658Sjhb ithread_update(it); 553151658Sjhb wakeup(ie); 554151658Sjhb } 555151658Sjhb } 556151658Sjhb CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, 557151658Sjhb ie->ie_name); 558151658Sjhb mtx_unlock(&ie->ie_lock); 559151658Sjhb 56072237Sjhb if (cookiep != NULL) 56172237Sjhb *cookiep = ih; 56272237Sjhb return (0); 56372237Sjhb} 564169320Spiso#else 565169320Spisoint 566169320Spisointr_event_add_handler(struct intr_event *ie, const char *name, 567169320Spiso driver_filter_t filter, driver_intr_t handler, void *arg, u_char pri, 568169320Spiso enum intr_type flags, void **cookiep) 569169320Spiso{ 570169320Spiso struct intr_handler *ih, *temp_ih; 571169320Spiso struct intr_thread *it; 57272237Sjhb 573169320Spiso if (ie == NULL || name == NULL || (handler == NULL && filter == NULL)) 574169320Spiso return (EINVAL); 575169320Spiso 576169320Spiso /* Allocate and populate an interrupt handler structure. */ 577169320Spiso ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO); 578169320Spiso ih->ih_filter = filter; 579169320Spiso ih->ih_handler = handler; 580169320Spiso ih->ih_argument = arg; 581169320Spiso ih->ih_name = name; 582169320Spiso ih->ih_event = ie; 583169320Spiso ih->ih_pri = pri; 584169320Spiso if (flags & INTR_EXCL) 585169320Spiso ih->ih_flags = IH_EXCLUSIVE; 586169320Spiso if (flags & INTR_MPSAFE) 587169320Spiso ih->ih_flags |= IH_MPSAFE; 588169320Spiso if (flags & INTR_ENTROPY) 589169320Spiso ih->ih_flags |= IH_ENTROPY; 590169320Spiso 591169320Spiso /* We can only have one exclusive handler in a event. */ 592169320Spiso mtx_lock(&ie->ie_lock); 593169320Spiso if (!TAILQ_EMPTY(&ie->ie_handlers)) { 594169320Spiso if ((flags & INTR_EXCL) || 595169320Spiso (TAILQ_FIRST(&ie->ie_handlers)->ih_flags & IH_EXCLUSIVE)) { 596169320Spiso mtx_unlock(&ie->ie_lock); 597169320Spiso free(ih, M_ITHREAD); 598169320Spiso return (EINVAL); 599169320Spiso } 600169320Spiso } 601169320Spiso 602169320Spiso /* Add the new handler to the event in priority order. */ 603169320Spiso TAILQ_FOREACH(temp_ih, &ie->ie_handlers, ih_next) { 604169320Spiso if (temp_ih->ih_pri > ih->ih_pri) 605169320Spiso break; 606169320Spiso } 607169320Spiso if (temp_ih == NULL) 608169320Spiso TAILQ_INSERT_TAIL(&ie->ie_handlers, ih, ih_next); 609169320Spiso else 610169320Spiso TAILQ_INSERT_BEFORE(temp_ih, ih, ih_next); 611169320Spiso intr_event_update(ie); 612169320Spiso 613169320Spiso /* For filtered handlers, create a private ithread to run on. */ 614169320Spiso if (filter != NULL && handler != NULL) { 615169320Spiso mtx_unlock(&ie->ie_lock); 616169320Spiso it = ithread_create("intr: newborn", ih); 617169320Spiso mtx_lock(&ie->ie_lock); 618169320Spiso it->it_event = ie; 619169320Spiso ih->ih_thread = it; 620169320Spiso ithread_update(it); // XXX - do we really need this?!?!? 621169320Spiso } else { /* Create the global per-event thread if we need one. */ 622169320Spiso while (ie->ie_thread == NULL && handler != NULL) { 623169320Spiso if (ie->ie_flags & IE_ADDING_THREAD) 624169320Spiso msleep(ie, &ie->ie_lock, 0, "ithread", 0); 625169320Spiso else { 626169320Spiso ie->ie_flags |= IE_ADDING_THREAD; 627169320Spiso mtx_unlock(&ie->ie_lock); 628169320Spiso it = ithread_create("intr: newborn", ih); 629169320Spiso mtx_lock(&ie->ie_lock); 630169320Spiso ie->ie_flags &= ~IE_ADDING_THREAD; 631169320Spiso ie->ie_thread = it; 632169320Spiso it->it_event = ie; 633169320Spiso ithread_update(it); 634169320Spiso wakeup(ie); 635169320Spiso } 636169320Spiso } 637169320Spiso } 638169320Spiso CTR3(KTR_INTR, "%s: added %s to %s", __func__, ih->ih_name, 639169320Spiso ie->ie_name); 640169320Spiso mtx_unlock(&ie->ie_lock); 641169320Spiso 642169320Spiso if (cookiep != NULL) 643169320Spiso *cookiep = ih; 644169320Spiso return (0); 645169320Spiso} 646169320Spiso#endif 647169320Spiso 648165125Sjhb/* 649165125Sjhb * Return the ie_source field from the intr_event an intr_handler is 650165125Sjhb * associated with. 651165125Sjhb */ 652165125Sjhbvoid * 653165125Sjhbintr_handler_source(void *cookie) 654165125Sjhb{ 655165125Sjhb struct intr_handler *ih; 656165125Sjhb struct intr_event *ie; 657165125Sjhb 658165125Sjhb ih = (struct intr_handler *)cookie; 659165125Sjhb if (ih == NULL) 660165125Sjhb return (NULL); 661165125Sjhb ie = ih->ih_event; 662165125Sjhb KASSERT(ie != NULL, 663165125Sjhb ("interrupt handler \"%s\" has a NULL interrupt event", 664165125Sjhb ih->ih_name)); 665165125Sjhb return (ie->ie_source); 666165125Sjhb} 667165125Sjhb 668169320Spiso#ifndef INTR_FILTER 66972237Sjhbint 670151658Sjhbintr_event_remove_handler(void *cookie) 67172237Sjhb{ 672151658Sjhb struct intr_handler *handler = (struct intr_handler *)cookie; 673151658Sjhb struct intr_event *ie; 67472237Sjhb#ifdef INVARIANTS 675151658Sjhb struct intr_handler *ih; 67672237Sjhb#endif 677151658Sjhb#ifdef notyet 678151658Sjhb int dead; 679151658Sjhb#endif 68072237Sjhb 68172759Sjhb if (handler == NULL) 68272237Sjhb return (EINVAL); 683151658Sjhb ie = handler->ih_event; 684151658Sjhb KASSERT(ie != NULL, 685151658Sjhb ("interrupt handler \"%s\" has a NULL interrupt event", 686165124Sjhb handler->ih_name)); 687151658Sjhb mtx_lock(&ie->ie_lock); 68887593Sobrien CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, 689151658Sjhb ie->ie_name); 69072237Sjhb#ifdef INVARIANTS 691151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 69272759Sjhb if (ih == handler) 69372759Sjhb goto ok; 694151658Sjhb mtx_unlock(&ie->ie_lock); 695151658Sjhb panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", 696151658Sjhb ih->ih_name, ie->ie_name); 69772759Sjhbok: 69872237Sjhb#endif 69972839Sjhb /* 700151658Sjhb * If there is no ithread, then just remove the handler and return. 701151658Sjhb * XXX: Note that an INTR_FAST handler might be running on another 702151658Sjhb * CPU! 703151658Sjhb */ 704151658Sjhb if (ie->ie_thread == NULL) { 705151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 706151658Sjhb mtx_unlock(&ie->ie_lock); 707151658Sjhb free(handler, M_ITHREAD); 708151658Sjhb return (0); 709151658Sjhb } 710151658Sjhb 711151658Sjhb /* 71272839Sjhb * If the interrupt thread is already running, then just mark this 71372839Sjhb * handler as being dead and let the ithread do the actual removal. 714124505Struckman * 715124505Struckman * During a cold boot while cold is set, msleep() does not sleep, 716124505Struckman * so we have to remove the handler here rather than letting the 717124505Struckman * thread do it. 71872839Sjhb */ 719170307Sjeff thread_lock(ie->ie_thread->it_thread); 720151658Sjhb if (!TD_AWAITING_INTR(ie->ie_thread->it_thread) && !cold) { 72172839Sjhb handler->ih_flags |= IH_DEAD; 72272839Sjhb 72372839Sjhb /* 72472839Sjhb * Ensure that the thread will process the handler list 72572839Sjhb * again and remove this handler if it has already passed 72672839Sjhb * it on the list. 72772839Sjhb */ 728151658Sjhb ie->ie_thread->it_need = 1; 729151658Sjhb } else 730151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 731170307Sjeff thread_unlock(ie->ie_thread->it_thread); 732151658Sjhb while (handler->ih_flags & IH_DEAD) 733157815Sjhb msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); 734151658Sjhb intr_event_update(ie); 735151658Sjhb#ifdef notyet 736151658Sjhb /* 737151658Sjhb * XXX: This could be bad in the case of ppbus(8). Also, I think 738151658Sjhb * this could lead to races of stale data when servicing an 739151658Sjhb * interrupt. 740151658Sjhb */ 741151658Sjhb dead = 1; 742151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 743151658Sjhb if (!(ih->ih_flags & IH_FAST)) { 744151658Sjhb dead = 0; 745151658Sjhb break; 746151658Sjhb } 747151658Sjhb } 748151658Sjhb if (dead) { 749151658Sjhb ithread_destroy(ie->ie_thread); 750151658Sjhb ie->ie_thread = NULL; 751151658Sjhb } 752151658Sjhb#endif 753151658Sjhb mtx_unlock(&ie->ie_lock); 75476771Sjhb free(handler, M_ITHREAD); 75572237Sjhb return (0); 75672237Sjhb} 75772237Sjhb 758177940Sjhbstatic int 759151658Sjhbintr_event_schedule_thread(struct intr_event *ie) 76072759Sjhb{ 761151658Sjhb struct intr_entropy entropy; 762151658Sjhb struct intr_thread *it; 76383366Sjulian struct thread *td; 764101176Sjulian struct thread *ctd; 76572759Sjhb struct proc *p; 76672759Sjhb 76772759Sjhb /* 76872759Sjhb * If no ithread or no handlers, then we have a stray interrupt. 76972759Sjhb */ 770151658Sjhb if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || 771151658Sjhb ie->ie_thread == NULL) 77272759Sjhb return (EINVAL); 77372759Sjhb 774101176Sjulian ctd = curthread; 775151658Sjhb it = ie->ie_thread; 776151658Sjhb td = it->it_thread; 777133191Srwatson p = td->td_proc; 778151658Sjhb 77972759Sjhb /* 78072759Sjhb * If any of the handlers for this ithread claim to be good 78172759Sjhb * sources of entropy, then gather some. 78272759Sjhb */ 783151658Sjhb if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) { 784133191Srwatson CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__, 785173004Sjulian p->p_pid, td->td_name); 786151658Sjhb entropy.event = (uintptr_t)ie; 787151658Sjhb entropy.td = ctd; 78872759Sjhb random_harvest(&entropy, sizeof(entropy), 2, 0, 78972759Sjhb RANDOM_INTERRUPT); 79072759Sjhb } 79172759Sjhb 792151658Sjhb KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); 79372759Sjhb 79472759Sjhb /* 79572759Sjhb * Set it_need to tell the thread to keep running if it is already 796170307Sjeff * running. Then, lock the thread and see if we actually need to 797170307Sjeff * put it on the runqueue. 79872759Sjhb */ 799151658Sjhb it->it_need = 1; 800170307Sjeff thread_lock(td); 801103216Sjulian if (TD_AWAITING_INTR(td)) { 802151658Sjhb CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, 803173004Sjulian td->td_name); 804103216Sjulian TD_CLR_IWAIT(td); 805166188Sjeff sched_add(td, SRQ_INTR); 80672759Sjhb } else { 807151658Sjhb CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", 808173004Sjulian __func__, p->p_pid, td->td_name, it->it_need, td->td_state); 80972759Sjhb } 810170307Sjeff thread_unlock(td); 81172759Sjhb 81272759Sjhb return (0); 81372759Sjhb} 814169320Spiso#else 815169320Spisoint 816169320Spisointr_event_remove_handler(void *cookie) 817169320Spiso{ 818169320Spiso struct intr_handler *handler = (struct intr_handler *)cookie; 819169320Spiso struct intr_event *ie; 820169320Spiso struct intr_thread *it; 821169320Spiso#ifdef INVARIANTS 822169320Spiso struct intr_handler *ih; 823169320Spiso#endif 824169320Spiso#ifdef notyet 825169320Spiso int dead; 826169320Spiso#endif 82772759Sjhb 828169320Spiso if (handler == NULL) 829169320Spiso return (EINVAL); 830169320Spiso ie = handler->ih_event; 831169320Spiso KASSERT(ie != NULL, 832169320Spiso ("interrupt handler \"%s\" has a NULL interrupt event", 833169320Spiso handler->ih_name)); 834169320Spiso mtx_lock(&ie->ie_lock); 835169320Spiso CTR3(KTR_INTR, "%s: removing %s from %s", __func__, handler->ih_name, 836169320Spiso ie->ie_name); 837169320Spiso#ifdef INVARIANTS 838169320Spiso TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 839169320Spiso if (ih == handler) 840169320Spiso goto ok; 841169320Spiso mtx_unlock(&ie->ie_lock); 842169320Spiso panic("interrupt handler \"%s\" not found in interrupt event \"%s\"", 843169320Spiso ih->ih_name, ie->ie_name); 844169320Spisook: 845169320Spiso#endif 846169320Spiso /* 847169320Spiso * If there are no ithreads (per event and per handler), then 848169320Spiso * just remove the handler and return. 849169320Spiso * XXX: Note that an INTR_FAST handler might be running on another CPU! 850169320Spiso */ 851169320Spiso if (ie->ie_thread == NULL && handler->ih_thread == NULL) { 852169320Spiso TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 853169320Spiso mtx_unlock(&ie->ie_lock); 854169320Spiso free(handler, M_ITHREAD); 855169320Spiso return (0); 856169320Spiso } 857169320Spiso 858169320Spiso /* Private or global ithread? */ 859169320Spiso it = (handler->ih_thread) ? handler->ih_thread : ie->ie_thread; 860169320Spiso /* 861169320Spiso * If the interrupt thread is already running, then just mark this 862169320Spiso * handler as being dead and let the ithread do the actual removal. 863169320Spiso * 864169320Spiso * During a cold boot while cold is set, msleep() does not sleep, 865169320Spiso * so we have to remove the handler here rather than letting the 866169320Spiso * thread do it. 867169320Spiso */ 868170307Sjeff thread_lock(it->it_thread); 869169320Spiso if (!TD_AWAITING_INTR(it->it_thread) && !cold) { 870169320Spiso handler->ih_flags |= IH_DEAD; 871169320Spiso 872169320Spiso /* 873169320Spiso * Ensure that the thread will process the handler list 874169320Spiso * again and remove this handler if it has already passed 875169320Spiso * it on the list. 876169320Spiso */ 877169320Spiso it->it_need = 1; 878169320Spiso } else 879169320Spiso TAILQ_REMOVE(&ie->ie_handlers, handler, ih_next); 880170307Sjeff thread_unlock(it->it_thread); 881169320Spiso while (handler->ih_flags & IH_DEAD) 882169320Spiso msleep(handler, &ie->ie_lock, 0, "iev_rmh", 0); 883169320Spiso /* 884169320Spiso * At this point, the handler has been disconnected from the event, 885169320Spiso * so we can kill the private ithread if any. 886169320Spiso */ 887169320Spiso if (handler->ih_thread) { 888169320Spiso ithread_destroy(handler->ih_thread); 889169320Spiso handler->ih_thread = NULL; 890169320Spiso } 891169320Spiso intr_event_update(ie); 892169320Spiso#ifdef notyet 893169320Spiso /* 894169320Spiso * XXX: This could be bad in the case of ppbus(8). Also, I think 895169320Spiso * this could lead to races of stale data when servicing an 896169320Spiso * interrupt. 897169320Spiso */ 898169320Spiso dead = 1; 899169320Spiso TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 900169320Spiso if (handler != NULL) { 901169320Spiso dead = 0; 902169320Spiso break; 903169320Spiso } 904169320Spiso } 905169320Spiso if (dead) { 906169320Spiso ithread_destroy(ie->ie_thread); 907169320Spiso ie->ie_thread = NULL; 908169320Spiso } 909169320Spiso#endif 910169320Spiso mtx_unlock(&ie->ie_lock); 911169320Spiso free(handler, M_ITHREAD); 912169320Spiso return (0); 913169320Spiso} 914169320Spiso 915177940Sjhbstatic int 916169320Spisointr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it) 917169320Spiso{ 918169320Spiso struct intr_entropy entropy; 919169320Spiso struct thread *td; 920169320Spiso struct thread *ctd; 921169320Spiso struct proc *p; 922169320Spiso 923169320Spiso /* 924169320Spiso * If no ithread or no handlers, then we have a stray interrupt. 925169320Spiso */ 926169320Spiso if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers) || it == NULL) 927169320Spiso return (EINVAL); 928169320Spiso 929169320Spiso ctd = curthread; 930169320Spiso td = it->it_thread; 931169320Spiso p = td->td_proc; 932169320Spiso 933169320Spiso /* 934169320Spiso * If any of the handlers for this ithread claim to be good 935169320Spiso * sources of entropy, then gather some. 936169320Spiso */ 937169320Spiso if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) { 938169320Spiso CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__, 939173004Sjulian p->p_pid, td->td_name); 940169320Spiso entropy.event = (uintptr_t)ie; 941169320Spiso entropy.td = ctd; 942169320Spiso random_harvest(&entropy, sizeof(entropy), 2, 0, 943169320Spiso RANDOM_INTERRUPT); 944169320Spiso } 945169320Spiso 946169320Spiso KASSERT(p != NULL, ("ithread %s has no process", ie->ie_name)); 947169320Spiso 948169320Spiso /* 949169320Spiso * Set it_need to tell the thread to keep running if it is already 950170307Sjeff * running. Then, lock the thread and see if we actually need to 951170307Sjeff * put it on the runqueue. 952169320Spiso */ 953169320Spiso it->it_need = 1; 954170307Sjeff thread_lock(td); 955169320Spiso if (TD_AWAITING_INTR(td)) { 956169320Spiso CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid, 957173122Sjulian td->td_name); 958169320Spiso TD_CLR_IWAIT(td); 959169320Spiso sched_add(td, SRQ_INTR); 960169320Spiso } else { 961169320Spiso CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d", 962173004Sjulian __func__, p->p_pid, td->td_name, it->it_need, td->td_state); 963169320Spiso } 964170307Sjeff thread_unlock(td); 965169320Spiso 966169320Spiso return (0); 967169320Spiso} 968169320Spiso#endif 969169320Spiso 970151699Sjhb/* 971151699Sjhb * Add a software interrupt handler to a specified event. If a given event 972151699Sjhb * is not specified, then a new event is created. 973151699Sjhb */ 97472759Sjhbint 975151658Sjhbswi_add(struct intr_event **eventp, const char *name, driver_intr_t handler, 97672237Sjhb void *arg, int pri, enum intr_type flags, void **cookiep) 97772237Sjhb{ 978151658Sjhb struct intr_event *ie; 97972237Sjhb int error; 98066698Sjhb 981169320Spiso if (flags & INTR_ENTROPY) 98272759Sjhb return (EINVAL); 98372759Sjhb 984151658Sjhb ie = (eventp != NULL) ? *eventp : NULL; 98566698Sjhb 986151658Sjhb if (ie != NULL) { 987151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 988151658Sjhb return (EINVAL); 98972759Sjhb } else { 990178092Sjeff error = intr_event_create(&ie, NULL, IE_SOFT, 0, 991177181Sjhb NULL, NULL, NULL, NULL, "swi%d:", pri); 99267551Sjhb if (error) 99372237Sjhb return (error); 994151658Sjhb if (eventp != NULL) 995151658Sjhb *eventp = ie; 99666698Sjhb } 997177859Sjeff error = intr_event_add_handler(ie, name, NULL, handler, arg, 998177859Sjeff (pri * RQ_PPQ) + PI_SOFT, flags, cookiep); 999177859Sjeff if (error) 1000177859Sjeff return (error); 1001177859Sjeff if (pri == SWI_CLOCK) { 1002177859Sjeff struct proc *p; 1003177859Sjeff p = ie->ie_thread->it_thread->td_proc; 1004177859Sjeff PROC_LOCK(p); 1005177859Sjeff p->p_flag |= P_NOLOAD; 1006177859Sjeff PROC_UNLOCK(p); 1007177859Sjeff } 1008177859Sjeff return (0); 100966698Sjhb} 101066698Sjhb 101166698Sjhb/* 1012151658Sjhb * Schedule a software interrupt thread. 101366698Sjhb */ 101467551Sjhbvoid 101572237Sjhbswi_sched(void *cookie, int flags) 101666698Sjhb{ 1017151658Sjhb struct intr_handler *ih = (struct intr_handler *)cookie; 1018151658Sjhb struct intr_event *ie = ih->ih_event; 101972759Sjhb int error; 102066698Sjhb 1021151658Sjhb CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name, 1022151658Sjhb ih->ih_need); 1023151658Sjhb 102467551Sjhb /* 102572759Sjhb * Set ih_need for this handler so that if the ithread is already 102672759Sjhb * running it will execute this handler on the next pass. Otherwise, 102772759Sjhb * it will execute it the next time it runs. 102867551Sjhb */ 102972237Sjhb atomic_store_rel_int(&ih->ih_need, 1); 1030163474Sbde 103172237Sjhb if (!(flags & SWI_DELAY)) { 1032170291Sattilio PCPU_INC(cnt.v_soft); 1033169320Spiso#ifdef INTR_FILTER 1034169320Spiso error = intr_event_schedule_thread(ie, ie->ie_thread); 1035169320Spiso#else 1036151658Sjhb error = intr_event_schedule_thread(ie); 1037169320Spiso#endif 103872759Sjhb KASSERT(error == 0, ("stray software interrupt")); 103966698Sjhb } 104066698Sjhb} 104166698Sjhb 1042151699Sjhb/* 1043151699Sjhb * Remove a software interrupt handler. Currently this code does not 1044151699Sjhb * remove the associated interrupt event if it becomes empty. Calling code 1045151699Sjhb * may do so manually via intr_event_destroy(), but that's not really 1046151699Sjhb * an optimal interface. 1047151699Sjhb */ 1048151699Sjhbint 1049151699Sjhbswi_remove(void *cookie) 1050151699Sjhb{ 1051151699Sjhb 1052151699Sjhb return (intr_event_remove_handler(cookie)); 1053151699Sjhb} 1054151699Sjhb 1055169320Spiso#ifdef INTR_FILTER 1056151658Sjhbstatic void 1057169320Spisopriv_ithread_execute_handler(struct proc *p, struct intr_handler *ih) 1058169320Spiso{ 1059169320Spiso struct intr_event *ie; 1060169320Spiso 1061169320Spiso ie = ih->ih_event; 1062169320Spiso /* 1063169320Spiso * If this handler is marked for death, remove it from 1064169320Spiso * the list of handlers and wake up the sleeper. 1065169320Spiso */ 1066169320Spiso if (ih->ih_flags & IH_DEAD) { 1067169320Spiso mtx_lock(&ie->ie_lock); 1068169320Spiso TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); 1069169320Spiso ih->ih_flags &= ~IH_DEAD; 1070169320Spiso wakeup(ih); 1071169320Spiso mtx_unlock(&ie->ie_lock); 1072169320Spiso return; 1073169320Spiso } 1074169320Spiso 1075169320Spiso /* Execute this handler. */ 1076169320Spiso CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", 1077169320Spiso __func__, p->p_pid, (void *)ih->ih_handler, ih->ih_argument, 1078169320Spiso ih->ih_name, ih->ih_flags); 1079169320Spiso 1080169320Spiso if (!(ih->ih_flags & IH_MPSAFE)) 1081169320Spiso mtx_lock(&Giant); 1082169320Spiso ih->ih_handler(ih->ih_argument); 1083169320Spiso if (!(ih->ih_flags & IH_MPSAFE)) 1084169320Spiso mtx_unlock(&Giant); 1085169320Spiso} 1086169320Spiso#endif 1087169320Spiso 1088183052Sjhb/* 1089183052Sjhb * This is a public function for use by drivers that mux interrupt 1090183052Sjhb * handlers for child devices from their interrupt handler. 1091183052Sjhb */ 1092183052Sjhbvoid 1093183052Sjhbintr_event_execute_handlers(struct proc *p, struct intr_event *ie) 1094151658Sjhb{ 1095151658Sjhb struct intr_handler *ih, *ihn; 1096151658Sjhb 1097151658Sjhb TAILQ_FOREACH_SAFE(ih, &ie->ie_handlers, ih_next, ihn) { 1098151658Sjhb /* 1099151658Sjhb * If this handler is marked for death, remove it from 1100151658Sjhb * the list of handlers and wake up the sleeper. 1101151658Sjhb */ 1102151658Sjhb if (ih->ih_flags & IH_DEAD) { 1103151658Sjhb mtx_lock(&ie->ie_lock); 1104151658Sjhb TAILQ_REMOVE(&ie->ie_handlers, ih, ih_next); 1105151658Sjhb ih->ih_flags &= ~IH_DEAD; 1106151658Sjhb wakeup(ih); 1107151658Sjhb mtx_unlock(&ie->ie_lock); 1108151658Sjhb continue; 1109151658Sjhb } 1110151658Sjhb 1111167080Spiso /* Skip filter only handlers */ 1112167080Spiso if (ih->ih_handler == NULL) 1113167080Spiso continue; 1114167080Spiso 1115151658Sjhb /* 1116151658Sjhb * For software interrupt threads, we only execute 1117151658Sjhb * handlers that have their need flag set. Hardware 1118151658Sjhb * interrupt threads always invoke all of their handlers. 1119151658Sjhb */ 1120151658Sjhb if (ie->ie_flags & IE_SOFT) { 1121151658Sjhb if (!ih->ih_need) 1122151658Sjhb continue; 1123151658Sjhb else 1124151658Sjhb atomic_store_rel_int(&ih->ih_need, 0); 1125151658Sjhb } 1126151658Sjhb 1127151658Sjhb /* Execute this handler. */ 1128151658Sjhb CTR6(KTR_INTR, "%s: pid %d exec %p(%p) for %s flg=%x", 1129169320Spiso __func__, p->p_pid, (void *)ih->ih_handler, 1130169320Spiso ih->ih_argument, ih->ih_name, ih->ih_flags); 1131151658Sjhb 1132151658Sjhb if (!(ih->ih_flags & IH_MPSAFE)) 1133151658Sjhb mtx_lock(&Giant); 1134151658Sjhb ih->ih_handler(ih->ih_argument); 1135151658Sjhb if (!(ih->ih_flags & IH_MPSAFE)) 1136151658Sjhb mtx_unlock(&Giant); 1137151658Sjhb } 1138183052Sjhb} 1139183052Sjhb 1140183052Sjhbstatic void 1141183052Sjhbithread_execute_handlers(struct proc *p, struct intr_event *ie) 1142183052Sjhb{ 1143183052Sjhb 1144183052Sjhb /* Interrupt handlers should not sleep. */ 1145151658Sjhb if (!(ie->ie_flags & IE_SOFT)) 1146183052Sjhb THREAD_NO_SLEEPING(); 1147183052Sjhb intr_event_execute_handlers(p, ie); 1148183052Sjhb if (!(ie->ie_flags & IE_SOFT)) 1149151658Sjhb THREAD_SLEEPING_OK(); 1150151658Sjhb 1151151658Sjhb /* 1152151658Sjhb * Interrupt storm handling: 1153151658Sjhb * 1154151658Sjhb * If this interrupt source is currently storming, then throttle 1155151658Sjhb * it to only fire the handler once per clock tick. 1156151658Sjhb * 1157151658Sjhb * If this interrupt source is not currently storming, but the 1158151658Sjhb * number of back to back interrupts exceeds the storm threshold, 1159151658Sjhb * then enter storming mode. 1160151658Sjhb */ 1161167173Sjhb if (intr_storm_threshold != 0 && ie->ie_count >= intr_storm_threshold && 1162167173Sjhb !(ie->ie_flags & IE_SOFT)) { 1163168850Snjl /* Report the message only once every second. */ 1164168850Snjl if (ppsratecheck(&ie->ie_warntm, &ie->ie_warncnt, 1)) { 1165151658Sjhb printf( 1166168850Snjl "interrupt storm detected on \"%s\"; throttling interrupt source\n", 1167151658Sjhb ie->ie_name); 1168151658Sjhb } 1169167173Sjhb pause("istorm", 1); 1170151658Sjhb } else 1171151658Sjhb ie->ie_count++; 1172151658Sjhb 1173151658Sjhb /* 1174151658Sjhb * Now that all the handlers have had a chance to run, reenable 1175151658Sjhb * the interrupt source. 1176151658Sjhb */ 1177177940Sjhb if (ie->ie_post_ithread != NULL) 1178177940Sjhb ie->ie_post_ithread(ie->ie_source); 1179151658Sjhb} 1180151658Sjhb 1181169320Spiso#ifndef INTR_FILTER 118266698Sjhb/* 118372237Sjhb * This is the main code for interrupt threads. 118466698Sjhb */ 1185104094Sphkstatic void 118672237Sjhbithread_loop(void *arg) 118766698Sjhb{ 1188151658Sjhb struct intr_thread *ithd; 1189151658Sjhb struct intr_event *ie; 119083366Sjulian struct thread *td; 119172237Sjhb struct proc *p; 1192151658Sjhb 119383366Sjulian td = curthread; 119483366Sjulian p = td->td_proc; 1195151658Sjhb ithd = (struct intr_thread *)arg; 1196151658Sjhb KASSERT(ithd->it_thread == td, 119787593Sobrien ("%s: ithread and proc linkage out of sync", __func__)); 1198151658Sjhb ie = ithd->it_event; 1199151658Sjhb ie->ie_count = 0; 120066698Sjhb 120167551Sjhb /* 120267551Sjhb * As long as we have interrupts outstanding, go through the 120367551Sjhb * list of handlers, giving each one a go at it. 120467551Sjhb */ 120566698Sjhb for (;;) { 120672237Sjhb /* 120772237Sjhb * If we are an orphaned thread, then just die. 120872237Sjhb */ 120972237Sjhb if (ithd->it_flags & IT_DEAD) { 1210151658Sjhb CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, 1211173004Sjulian p->p_pid, td->td_name); 121272237Sjhb free(ithd, M_ITHREAD); 1213173044Sjulian kthread_exit(); 121472237Sjhb } 121572237Sjhb 1216151658Sjhb /* 1217151658Sjhb * Service interrupts. If another interrupt arrives while 1218151658Sjhb * we are running, it will set it_need to note that we 1219151658Sjhb * should make another pass. 1220151658Sjhb */ 122172237Sjhb while (ithd->it_need) { 122267551Sjhb /* 1223151658Sjhb * This might need a full read and write barrier 1224151658Sjhb * to make sure that this write posts before any 1225151658Sjhb * of the memory or device accesses in the 1226151658Sjhb * handlers. 122767551Sjhb */ 122872237Sjhb atomic_store_rel_int(&ithd->it_need, 0); 1229151658Sjhb ithread_execute_handlers(p, ie); 123066698Sjhb } 1231128331Sjhb WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); 1232128331Sjhb mtx_assert(&Giant, MA_NOTOWNED); 123367551Sjhb 123466698Sjhb /* 123566698Sjhb * Processed all our interrupts. Now get the sched 123667551Sjhb * lock. This may take a while and it_need may get 123766698Sjhb * set again, so we have to check it again. 123866698Sjhb */ 1239170307Sjeff thread_lock(td); 1240151658Sjhb if (!ithd->it_need && !(ithd->it_flags & IT_DEAD)) { 1241128331Sjhb TD_SET_IWAIT(td); 1242151658Sjhb ie->ie_count = 0; 1243178272Sjeff mi_switch(SW_VOL | SWT_IWAIT, NULL); 124466698Sjhb } 1245170307Sjeff thread_unlock(td); 124666698Sjhb } 124766698Sjhb} 1248177940Sjhb 1249177940Sjhb/* 1250177940Sjhb * Main interrupt handling body. 1251177940Sjhb * 1252177940Sjhb * Input: 1253177940Sjhb * o ie: the event connected to this interrupt. 1254177940Sjhb * o frame: some archs (i.e. i386) pass a frame to some. 1255177940Sjhb * handlers as their main argument. 1256177940Sjhb * Return value: 1257177940Sjhb * o 0: everything ok. 1258177940Sjhb * o EINVAL: stray interrupt. 1259177940Sjhb */ 1260177940Sjhbint 1261177940Sjhbintr_event_handle(struct intr_event *ie, struct trapframe *frame) 1262177940Sjhb{ 1263177940Sjhb struct intr_handler *ih; 1264177940Sjhb struct thread *td; 1265177940Sjhb int error, ret, thread; 1266177940Sjhb 1267177940Sjhb td = curthread; 1268177940Sjhb 1269177940Sjhb /* An interrupt with no event or handlers is a stray interrupt. */ 1270177940Sjhb if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers)) 1271177940Sjhb return (EINVAL); 1272177940Sjhb 1273177940Sjhb /* 1274177940Sjhb * Execute fast interrupt handlers directly. 1275177940Sjhb * To support clock handlers, if a handler registers 1276177940Sjhb * with a NULL argument, then we pass it a pointer to 1277177940Sjhb * a trapframe as its argument. 1278177940Sjhb */ 1279177940Sjhb td->td_intr_nesting_level++; 1280177940Sjhb thread = 0; 1281177940Sjhb ret = 0; 1282177940Sjhb critical_enter(); 1283177940Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 1284177940Sjhb if (ih->ih_filter == NULL) { 1285177940Sjhb thread = 1; 1286177940Sjhb continue; 1287177940Sjhb } 1288177940Sjhb CTR4(KTR_INTR, "%s: exec %p(%p) for %s", __func__, 1289177940Sjhb ih->ih_filter, ih->ih_argument == NULL ? frame : 1290177940Sjhb ih->ih_argument, ih->ih_name); 1291177940Sjhb if (ih->ih_argument == NULL) 1292177940Sjhb ret = ih->ih_filter(frame); 1293177940Sjhb else 1294177940Sjhb ret = ih->ih_filter(ih->ih_argument); 1295177940Sjhb /* 1296177940Sjhb * Wrapper handler special handling: 1297177940Sjhb * 1298177940Sjhb * in some particular cases (like pccard and pccbb), 1299177940Sjhb * the _real_ device handler is wrapped in a couple of 1300177940Sjhb * functions - a filter wrapper and an ithread wrapper. 1301177940Sjhb * In this case (and just in this case), the filter wrapper 1302177940Sjhb * could ask the system to schedule the ithread and mask 1303177940Sjhb * the interrupt source if the wrapped handler is composed 1304177940Sjhb * of just an ithread handler. 1305177940Sjhb * 1306177940Sjhb * TODO: write a generic wrapper to avoid people rolling 1307177940Sjhb * their own 1308177940Sjhb */ 1309177940Sjhb if (!thread) { 1310177940Sjhb if (ret == FILTER_SCHEDULE_THREAD) 1311177940Sjhb thread = 1; 1312177940Sjhb } 1313177940Sjhb } 1314177940Sjhb 1315177940Sjhb if (thread) { 1316177940Sjhb if (ie->ie_pre_ithread != NULL) 1317177940Sjhb ie->ie_pre_ithread(ie->ie_source); 1318177940Sjhb } else { 1319177940Sjhb if (ie->ie_post_filter != NULL) 1320177940Sjhb ie->ie_post_filter(ie->ie_source); 1321177940Sjhb } 1322177940Sjhb 1323177940Sjhb /* Schedule the ithread if needed. */ 1324177940Sjhb if (thread) { 1325177940Sjhb error = intr_event_schedule_thread(ie); 1326182024Skmacy#ifndef XEN 1327177940Sjhb KASSERT(error == 0, ("bad stray interrupt")); 1328182024Skmacy#else 1329182024Skmacy if (error != 0) 1330182024Skmacy log(LOG_WARNING, "bad stray interrupt"); 1331182024Skmacy#endif 1332177940Sjhb } 1333177940Sjhb critical_exit(); 1334177940Sjhb td->td_intr_nesting_level--; 1335177940Sjhb return (0); 1336177940Sjhb} 1337169320Spiso#else 1338169320Spiso/* 1339169320Spiso * This is the main code for interrupt threads. 1340169320Spiso */ 1341169320Spisostatic void 1342169320Spisoithread_loop(void *arg) 1343169320Spiso{ 1344169320Spiso struct intr_thread *ithd; 1345169320Spiso struct intr_handler *ih; 1346169320Spiso struct intr_event *ie; 1347169320Spiso struct thread *td; 1348169320Spiso struct proc *p; 1349169320Spiso int priv; 135066698Sjhb 1351169320Spiso td = curthread; 1352169320Spiso p = td->td_proc; 1353169320Spiso ih = (struct intr_handler *)arg; 1354169320Spiso priv = (ih->ih_thread != NULL) ? 1 : 0; 1355169320Spiso ithd = (priv) ? ih->ih_thread : ih->ih_event->ie_thread; 1356169320Spiso KASSERT(ithd->it_thread == td, 1357169320Spiso ("%s: ithread and proc linkage out of sync", __func__)); 1358169320Spiso ie = ithd->it_event; 1359169320Spiso ie->ie_count = 0; 1360169320Spiso 1361169320Spiso /* 1362169320Spiso * As long as we have interrupts outstanding, go through the 1363169320Spiso * list of handlers, giving each one a go at it. 1364169320Spiso */ 1365169320Spiso for (;;) { 1366169320Spiso /* 1367169320Spiso * If we are an orphaned thread, then just die. 1368169320Spiso */ 1369169320Spiso if (ithd->it_flags & IT_DEAD) { 1370169320Spiso CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__, 1371173004Sjulian p->p_pid, td->td_name); 1372169320Spiso free(ithd, M_ITHREAD); 1373173044Sjulian kthread_exit(); 1374169320Spiso } 1375169320Spiso 1376169320Spiso /* 1377169320Spiso * Service interrupts. If another interrupt arrives while 1378169320Spiso * we are running, it will set it_need to note that we 1379169320Spiso * should make another pass. 1380169320Spiso */ 1381169320Spiso while (ithd->it_need) { 1382169320Spiso /* 1383169320Spiso * This might need a full read and write barrier 1384169320Spiso * to make sure that this write posts before any 1385169320Spiso * of the memory or device accesses in the 1386169320Spiso * handlers. 1387169320Spiso */ 1388169320Spiso atomic_store_rel_int(&ithd->it_need, 0); 1389169320Spiso if (priv) 1390169320Spiso priv_ithread_execute_handler(p, ih); 1391169320Spiso else 1392169320Spiso ithread_execute_handlers(p, ie); 1393169320Spiso } 1394169320Spiso WITNESS_WARN(WARN_PANIC, NULL, "suspending ithread"); 1395169320Spiso mtx_assert(&Giant, MA_NOTOWNED); 1396169320Spiso 1397169320Spiso /* 1398169320Spiso * Processed all our interrupts. Now get the sched 1399169320Spiso * lock. This may take a while and it_need may get 1400169320Spiso * set again, so we have to check it again. 1401169320Spiso */ 1402170307Sjeff thread_lock(td); 1403169320Spiso if (!ithd->it_need && !(ithd->it_flags & IT_DEAD)) { 1404169320Spiso TD_SET_IWAIT(td); 1405169320Spiso ie->ie_count = 0; 1406178272Sjeff mi_switch(SW_VOL | SWT_IWAIT, NULL); 1407169320Spiso } 1408170307Sjeff thread_unlock(td); 1409169320Spiso } 1410169320Spiso} 1411169320Spiso 1412169320Spiso/* 1413169320Spiso * Main loop for interrupt filter. 1414169320Spiso * 1415169320Spiso * Some architectures (i386, amd64 and arm) require the optional frame 1416169320Spiso * parameter, and use it as the main argument for fast handler execution 1417169320Spiso * when ih_argument == NULL. 1418169320Spiso * 1419169320Spiso * Return value: 1420169320Spiso * o FILTER_STRAY: No filter recognized the event, and no 1421169320Spiso * filter-less handler is registered on this 1422169320Spiso * line. 1423169320Spiso * o FILTER_HANDLED: A filter claimed the event and served it. 1424169320Spiso * o FILTER_SCHEDULE_THREAD: No filter claimed the event, but there's at 1425169320Spiso * least one filter-less handler on this line. 1426169320Spiso * o FILTER_HANDLED | 1427169320Spiso * FILTER_SCHEDULE_THREAD: A filter claimed the event, and asked for 1428169320Spiso * scheduling the per-handler ithread. 1429169320Spiso * 1430169320Spiso * In case an ithread has to be scheduled, in *ithd there will be a 1431169320Spiso * pointer to a struct intr_thread containing the thread to be 1432169320Spiso * scheduled. 1433169320Spiso */ 1434169320Spiso 1435177940Sjhbstatic int 1436169320Spisointr_filter_loop(struct intr_event *ie, struct trapframe *frame, 1437169320Spiso struct intr_thread **ithd) 1438169320Spiso{ 1439169320Spiso struct intr_handler *ih; 1440169320Spiso void *arg; 1441169320Spiso int ret, thread_only; 1442169320Spiso 1443169320Spiso ret = 0; 1444169320Spiso thread_only = 0; 1445169320Spiso TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { 1446169320Spiso /* 1447169320Spiso * Execute fast interrupt handlers directly. 1448169320Spiso * To support clock handlers, if a handler registers 1449169320Spiso * with a NULL argument, then we pass it a pointer to 1450169320Spiso * a trapframe as its argument. 1451169320Spiso */ 1452169320Spiso arg = ((ih->ih_argument == NULL) ? frame : ih->ih_argument); 1453169320Spiso 1454169320Spiso CTR5(KTR_INTR, "%s: exec %p/%p(%p) for %s", __func__, 1455169320Spiso ih->ih_filter, ih->ih_handler, arg, ih->ih_name); 1456169320Spiso 1457169320Spiso if (ih->ih_filter != NULL) 1458169320Spiso ret = ih->ih_filter(arg); 1459169320Spiso else { 1460169320Spiso thread_only = 1; 1461169320Spiso continue; 1462169320Spiso } 1463169320Spiso 1464169320Spiso if (ret & FILTER_STRAY) 1465169320Spiso continue; 1466169320Spiso else { 1467169320Spiso *ithd = ih->ih_thread; 1468169320Spiso return (ret); 1469169320Spiso } 1470169320Spiso } 1471169320Spiso 1472169320Spiso /* 1473169320Spiso * No filters handled the interrupt and we have at least 1474169320Spiso * one handler without a filter. In this case, we schedule 1475169320Spiso * all of the filter-less handlers to run in the ithread. 1476169320Spiso */ 1477169320Spiso if (thread_only) { 1478169320Spiso *ithd = ie->ie_thread; 1479169320Spiso return (FILTER_SCHEDULE_THREAD); 1480169320Spiso } 1481169320Spiso return (FILTER_STRAY); 1482169320Spiso} 1483169320Spiso 1484169320Spiso/* 1485169320Spiso * Main interrupt handling body. 1486169320Spiso * 1487169320Spiso * Input: 1488169320Spiso * o ie: the event connected to this interrupt. 1489169320Spiso * o frame: some archs (i.e. i386) pass a frame to some. 1490169320Spiso * handlers as their main argument. 1491169320Spiso * Return value: 1492169320Spiso * o 0: everything ok. 1493169320Spiso * o EINVAL: stray interrupt. 1494169320Spiso */ 1495169320Spisoint 1496169320Spisointr_event_handle(struct intr_event *ie, struct trapframe *frame) 1497169320Spiso{ 1498169320Spiso struct intr_thread *ithd; 1499169320Spiso struct thread *td; 1500169320Spiso int thread; 1501169320Spiso 1502169320Spiso ithd = NULL; 1503169320Spiso td = curthread; 1504169320Spiso 1505169320Spiso if (ie == NULL || TAILQ_EMPTY(&ie->ie_handlers)) 1506169320Spiso return (EINVAL); 1507169320Spiso 1508169320Spiso td->td_intr_nesting_level++; 1509169320Spiso thread = 0; 1510169320Spiso critical_enter(); 1511177940Sjhb thread = intr_filter_loop(ie, frame, &ithd); 1512169320Spiso if (thread & FILTER_HANDLED) { 1513177940Sjhb if (ie->ie_post_filter != NULL) 1514177940Sjhb ie->ie_post_filter(ie->ie_source); 1515169320Spiso } else { 1516177940Sjhb if (ie->ie_pre_ithread != NULL) 1517177940Sjhb ie->ie_pre_ithread(ie->ie_source); 1518169320Spiso } 1519169320Spiso critical_exit(); 1520169320Spiso 1521169320Spiso /* Interrupt storm logic */ 1522169320Spiso if (thread & FILTER_STRAY) { 1523169320Spiso ie->ie_count++; 1524169320Spiso if (ie->ie_count < intr_storm_threshold) 1525169320Spiso printf("Interrupt stray detection not present\n"); 1526169320Spiso } 1527169320Spiso 1528169320Spiso /* Schedule an ithread if needed. */ 1529169320Spiso if (thread & FILTER_SCHEDULE_THREAD) { 1530169320Spiso if (intr_event_schedule_thread(ie, ithd) != 0) 1531169320Spiso panic("%s: impossible stray interrupt", __func__); 1532169320Spiso } 1533169320Spiso td->td_intr_nesting_level--; 1534169320Spiso return (0); 1535169320Spiso} 1536169320Spiso#endif 1537169320Spiso 1538121482Sjhb#ifdef DDB 153972237Sjhb/* 1540121482Sjhb * Dump details about an interrupt handler 1541121482Sjhb */ 1542121482Sjhbstatic void 1543151658Sjhbdb_dump_intrhand(struct intr_handler *ih) 1544121482Sjhb{ 1545121482Sjhb int comma; 1546121482Sjhb 1547121482Sjhb db_printf("\t%-10s ", ih->ih_name); 1548121482Sjhb switch (ih->ih_pri) { 1549121482Sjhb case PI_REALTIME: 1550121482Sjhb db_printf("CLK "); 1551121482Sjhb break; 1552121482Sjhb case PI_AV: 1553121482Sjhb db_printf("AV "); 1554121482Sjhb break; 1555121482Sjhb case PI_TTYHIGH: 1556121482Sjhb case PI_TTYLOW: 1557121482Sjhb db_printf("TTY "); 1558121482Sjhb break; 1559121482Sjhb case PI_TAPE: 1560121482Sjhb db_printf("TAPE"); 1561121482Sjhb break; 1562121482Sjhb case PI_NET: 1563121482Sjhb db_printf("NET "); 1564121482Sjhb break; 1565121482Sjhb case PI_DISK: 1566121482Sjhb case PI_DISKLOW: 1567121482Sjhb db_printf("DISK"); 1568121482Sjhb break; 1569121482Sjhb case PI_DULL: 1570121482Sjhb db_printf("DULL"); 1571121482Sjhb break; 1572121482Sjhb default: 1573121482Sjhb if (ih->ih_pri >= PI_SOFT) 1574121482Sjhb db_printf("SWI "); 1575121482Sjhb else 1576121482Sjhb db_printf("%4u", ih->ih_pri); 1577121482Sjhb break; 1578121482Sjhb } 1579121482Sjhb db_printf(" "); 1580121482Sjhb db_printsym((uintptr_t)ih->ih_handler, DB_STGY_PROC); 1581121482Sjhb db_printf("(%p)", ih->ih_argument); 1582121482Sjhb if (ih->ih_need || 1583166901Spiso (ih->ih_flags & (IH_EXCLUSIVE | IH_ENTROPY | IH_DEAD | 1584121482Sjhb IH_MPSAFE)) != 0) { 1585121482Sjhb db_printf(" {"); 1586121482Sjhb comma = 0; 1587121482Sjhb if (ih->ih_flags & IH_EXCLUSIVE) { 1588121482Sjhb if (comma) 1589121482Sjhb db_printf(", "); 1590121482Sjhb db_printf("EXCL"); 1591121482Sjhb comma = 1; 1592121482Sjhb } 1593121482Sjhb if (ih->ih_flags & IH_ENTROPY) { 1594121482Sjhb if (comma) 1595121482Sjhb db_printf(", "); 1596121482Sjhb db_printf("ENTROPY"); 1597121482Sjhb comma = 1; 1598121482Sjhb } 1599121482Sjhb if (ih->ih_flags & IH_DEAD) { 1600121482Sjhb if (comma) 1601121482Sjhb db_printf(", "); 1602121482Sjhb db_printf("DEAD"); 1603121482Sjhb comma = 1; 1604121482Sjhb } 1605121482Sjhb if (ih->ih_flags & IH_MPSAFE) { 1606121482Sjhb if (comma) 1607121482Sjhb db_printf(", "); 1608121482Sjhb db_printf("MPSAFE"); 1609121482Sjhb comma = 1; 1610121482Sjhb } 1611121482Sjhb if (ih->ih_need) { 1612121482Sjhb if (comma) 1613121482Sjhb db_printf(", "); 1614121482Sjhb db_printf("NEED"); 1615121482Sjhb } 1616121482Sjhb db_printf("}"); 1617121482Sjhb } 1618121482Sjhb db_printf("\n"); 1619121482Sjhb} 1620121482Sjhb 1621121482Sjhb/* 1622151658Sjhb * Dump details about a event. 1623121482Sjhb */ 1624121482Sjhbvoid 1625151658Sjhbdb_dump_intr_event(struct intr_event *ie, int handlers) 1626121482Sjhb{ 1627151658Sjhb struct intr_handler *ih; 1628151658Sjhb struct intr_thread *it; 1629121482Sjhb int comma; 1630121482Sjhb 1631151658Sjhb db_printf("%s ", ie->ie_fullname); 1632151658Sjhb it = ie->ie_thread; 1633151658Sjhb if (it != NULL) 1634151658Sjhb db_printf("(pid %d)", it->it_thread->td_proc->p_pid); 1635151658Sjhb else 1636151658Sjhb db_printf("(no thread)"); 1637151658Sjhb if ((ie->ie_flags & (IE_SOFT | IE_ENTROPY | IE_ADDING_THREAD)) != 0 || 1638151658Sjhb (it != NULL && it->it_need)) { 1639121482Sjhb db_printf(" {"); 1640121482Sjhb comma = 0; 1641151658Sjhb if (ie->ie_flags & IE_SOFT) { 1642121482Sjhb db_printf("SOFT"); 1643121482Sjhb comma = 1; 1644121482Sjhb } 1645151658Sjhb if (ie->ie_flags & IE_ENTROPY) { 1646121482Sjhb if (comma) 1647121482Sjhb db_printf(", "); 1648121482Sjhb db_printf("ENTROPY"); 1649121482Sjhb comma = 1; 1650121482Sjhb } 1651151658Sjhb if (ie->ie_flags & IE_ADDING_THREAD) { 1652121482Sjhb if (comma) 1653121482Sjhb db_printf(", "); 1654151658Sjhb db_printf("ADDING_THREAD"); 1655121482Sjhb comma = 1; 1656121482Sjhb } 1657151658Sjhb if (it != NULL && it->it_need) { 1658121482Sjhb if (comma) 1659121482Sjhb db_printf(", "); 1660121482Sjhb db_printf("NEED"); 1661121482Sjhb } 1662121482Sjhb db_printf("}"); 1663121482Sjhb } 1664121482Sjhb db_printf("\n"); 1665121482Sjhb 1666121482Sjhb if (handlers) 1667151658Sjhb TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) 1668121482Sjhb db_dump_intrhand(ih); 1669121482Sjhb} 1670151658Sjhb 1671151658Sjhb/* 1672151658Sjhb * Dump data about interrupt handlers 1673151658Sjhb */ 1674151658SjhbDB_SHOW_COMMAND(intr, db_show_intr) 1675151658Sjhb{ 1676151658Sjhb struct intr_event *ie; 1677160312Sjhb int all, verbose; 1678151658Sjhb 1679151658Sjhb verbose = index(modif, 'v') != NULL; 1680151658Sjhb all = index(modif, 'a') != NULL; 1681151658Sjhb TAILQ_FOREACH(ie, &event_list, ie_list) { 1682151658Sjhb if (!all && TAILQ_EMPTY(&ie->ie_handlers)) 1683151658Sjhb continue; 1684151658Sjhb db_dump_intr_event(ie, verbose); 1685160312Sjhb if (db_pager_quit) 1686160312Sjhb break; 1687151658Sjhb } 1688151658Sjhb} 1689121482Sjhb#endif /* DDB */ 1690121482Sjhb 1691121482Sjhb/* 169267551Sjhb * Start standard software interrupt threads 169366698Sjhb */ 169467551Sjhbstatic void 169572237Sjhbstart_softintr(void *dummy) 169667551Sjhb{ 169772237Sjhb 1698177859Sjeff if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih)) 1699177859Sjeff panic("died while creating vm swi ithread"); 170066698Sjhb} 1701177253SrwatsonSYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr, 1702177253Srwatson NULL); 170366698Sjhb 1704151658Sjhb/* 170577582Stmm * Sysctls used by systat and others: hw.intrnames and hw.intrcnt. 170677582Stmm * The data for this machine dependent, and the declarations are in machine 170777582Stmm * dependent code. The layout of intrnames and intrcnt however is machine 170877582Stmm * independent. 170977582Stmm * 171077582Stmm * We do not know the length of intrcnt and intrnames at compile time, so 171177582Stmm * calculate things at run time. 171277582Stmm */ 171377582Stmmstatic int 171477582Stmmsysctl_intrnames(SYSCTL_HANDLER_ARGS) 171577582Stmm{ 1716151658Sjhb return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames, 171777582Stmm req)); 171877582Stmm} 171977582Stmm 172077582StmmSYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD, 172177582Stmm NULL, 0, sysctl_intrnames, "", "Interrupt Names"); 172277582Stmm 172377582Stmmstatic int 172477582Stmmsysctl_intrcnt(SYSCTL_HANDLER_ARGS) 172577582Stmm{ 1726151658Sjhb return (sysctl_handle_opaque(oidp, intrcnt, 172777582Stmm (char *)eintrcnt - (char *)intrcnt, req)); 172877582Stmm} 172977582Stmm 173077582StmmSYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD, 173177582Stmm NULL, 0, sysctl_intrcnt, "", "Interrupt Counts"); 1732121482Sjhb 1733121482Sjhb#ifdef DDB 1734121482Sjhb/* 1735121482Sjhb * DDB command to dump the interrupt statistics. 1736121482Sjhb */ 1737121482SjhbDB_SHOW_COMMAND(intrcnt, db_show_intrcnt) 1738121482Sjhb{ 1739121482Sjhb u_long *i; 1740121482Sjhb char *cp; 1741121482Sjhb 1742121482Sjhb cp = intrnames; 1743160312Sjhb for (i = intrcnt; i != eintrcnt && !db_pager_quit; i++) { 1744121482Sjhb if (*cp == '\0') 1745121482Sjhb break; 1746121482Sjhb if (*i != 0) 1747121482Sjhb db_printf("%s\t%lu\n", cp, *i); 1748121482Sjhb cp += strlen(cp) + 1; 1749121482Sjhb } 1750121482Sjhb} 1751121482Sjhb#endif 1752