| 1 | /* |
| 2 | * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com> All rights reserved. |
| 3 | * Copyright (c) 1997, Stefan Esser <se@freebsd.org> All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice unmodified, this list of conditions, and the following |
| 10 | * disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | * |
| 26 | * $FreeBSD: src/sys/kern/kern_intr.c,v 1.24.2.1 2001/10/14 20:05:50 luigi Exp $ |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <sys/param.h> |
| 31 | #include <sys/systm.h> |
| 32 | #include <sys/malloc.h> |
| 33 | #include <sys/kernel.h> |
| 34 | #include <sys/sysctl.h> |
| 35 | #include <sys/thread.h> |
| 36 | #include <sys/proc.h> |
| 37 | #include <sys/random.h> |
| 38 | #include <sys/serialize.h> |
| 39 | #include <sys/interrupt.h> |
| 40 | #include <sys/bus.h> |
| 41 | #include <sys/machintr.h> |
| 42 | |
| 43 | #include <machine/frame.h> |
| 44 | |
| 45 | #include <sys/thread2.h> |
| 46 | #include <sys/mplock2.h> |
| 47 | |
| 48 | struct intr_info; |
| 49 | |
| 50 | typedef struct intrec { |
| 51 | struct intrec *next; |
| 52 | struct intr_info *info; |
| 53 | inthand2_t *handler; |
| 54 | void *argument; |
| 55 | char *name; |
| 56 | int intr; |
| 57 | int intr_flags; |
| 58 | struct lwkt_serialize *serializer; |
| 59 | } *intrec_t; |
| 60 | |
| 61 | struct intr_info { |
| 62 | intrec_t i_reclist; |
| 63 | struct thread i_thread; |
| 64 | struct random_softc i_random; |
| 65 | int i_running; |
| 66 | long i_count; /* interrupts dispatched */ |
| 67 | int i_mplock_required; |
| 68 | int i_fast; |
| 69 | int i_slow; |
| 70 | int i_state; |
| 71 | int i_errorticks; |
| 72 | unsigned long i_straycount; |
| 73 | int i_cpuid; |
| 74 | int i_intr; |
| 75 | }; |
| 76 | |
| 77 | static struct intr_info intr_info_ary[MAXCPU][MAX_INTS]; |
| 78 | static struct intr_info *swi_info_ary[MAX_SOFTINTS]; |
| 79 | |
| 80 | static int max_installed_hard_intr[MAXCPU]; |
| 81 | |
| 82 | #define EMERGENCY_INTR_POLLING_FREQ_MAX 20000 |
| 83 | |
| 84 | /* |
| 85 | * Assert that callers into interrupt handlers don't return with |
| 86 | * dangling tokens, spinlocks, or mp locks. |
| 87 | */ |
| 88 | #ifdef INVARIANTS |
| 89 | |
| 90 | #define TD_INVARIANTS_DECLARE \ |
| 91 | int spincount; \ |
| 92 | lwkt_tokref_t curstop |
| 93 | |
| 94 | #define TD_INVARIANTS_GET(td) \ |
| 95 | do { \ |
| 96 | spincount = (td)->td_gd->gd_spinlocks; \ |
| 97 | curstop = (td)->td_toks_stop; \ |
| 98 | } while(0) |
| 99 | |
| 100 | #define TD_INVARIANTS_TEST(td, name) \ |
| 101 | do { \ |
| 102 | KASSERT(spincount == (td)->td_gd->gd_spinlocks, \ |
| 103 | ("spincount mismatch after interrupt handler %s", \ |
| 104 | name)); \ |
| 105 | KASSERT(curstop == (td)->td_toks_stop, \ |
| 106 | ("token count mismatch after interrupt handler %s", \ |
| 107 | name)); \ |
| 108 | } while(0) |
| 109 | |
| 110 | #else |
| 111 | |
| 112 | /* !INVARIANTS */ |
| 113 | |
| 114 | #define TD_INVARIANTS_DECLARE |
| 115 | #define TD_INVARIANTS_GET(td) |
| 116 | #define TD_INVARIANTS_TEST(td, name) |
| 117 | |
| 118 | #endif /* ndef INVARIANTS */ |
| 119 | |
| 120 | static int sysctl_emergency_freq(SYSCTL_HANDLER_ARGS); |
| 121 | static int sysctl_emergency_enable(SYSCTL_HANDLER_ARGS); |
| 122 | static void emergency_intr_timer_callback(systimer_t, int, struct intrframe *); |
| 123 | static void ithread_handler(void *arg); |
| 124 | static void ithread_emergency(void *arg); |
| 125 | static void report_stray_interrupt(struct intr_info *info, const char *func); |
| 126 | static void int_moveto_destcpu(int *, int); |
| 127 | static void int_moveto_origcpu(int, int); |
| 128 | static void sched_ithd_intern(struct intr_info *info); |
| 129 | |
| 130 | static struct systimer emergency_intr_timer[MAXCPU]; |
| 131 | static struct thread emergency_intr_thread[MAXCPU]; |
| 132 | |
| 133 | #define ISTATE_NOTHREAD 0 |
| 134 | #define ISTATE_NORMAL 1 |
| 135 | #define ISTATE_LIVELOCKED 2 |
| 136 | |
| 137 | static int livelock_limit = 40000; |
| 138 | static int livelock_lowater = 20000; |
| 139 | static int livelock_debug = -1; |
| 140 | SYSCTL_INT(_kern, OID_AUTO, livelock_limit, |
| 141 | CTLFLAG_RW, &livelock_limit, 0, "Livelock interrupt rate limit"); |
| 142 | SYSCTL_INT(_kern, OID_AUTO, livelock_lowater, |
| 143 | CTLFLAG_RW, &livelock_lowater, 0, "Livelock low-water mark restore"); |
| 144 | SYSCTL_INT(_kern, OID_AUTO, livelock_debug, |
| 145 | CTLFLAG_RW, &livelock_debug, 0, "Livelock debug intr#"); |
| 146 | |
| 147 | static int emergency_intr_enable = 0; /* emergency interrupt polling */ |
| 148 | TUNABLE_INT("kern.emergency_intr_enable", &emergency_intr_enable); |
| 149 | SYSCTL_PROC(_kern, OID_AUTO, emergency_intr_enable, CTLTYPE_INT | CTLFLAG_RW, |
| 150 | 0, 0, sysctl_emergency_enable, "I", "Emergency Interrupt Poll Enable"); |
| 151 | |
| 152 | static int emergency_intr_freq = 10; /* emergency polling frequency */ |
| 153 | TUNABLE_INT("kern.emergency_intr_freq", &emergency_intr_freq); |
| 154 | SYSCTL_PROC(_kern, OID_AUTO, emergency_intr_freq, CTLTYPE_INT | CTLFLAG_RW, |
| 155 | 0, 0, sysctl_emergency_freq, "I", "Emergency Interrupt Poll Frequency"); |
| 156 | |
| 157 | /* |
| 158 | * Sysctl support routines |
| 159 | */ |
| 160 | static int |
| 161 | sysctl_emergency_enable(SYSCTL_HANDLER_ARGS) |
| 162 | { |
| 163 | int error, enabled, cpuid, freq; |
| 164 | |
| 165 | enabled = emergency_intr_enable; |
| 166 | error = sysctl_handle_int(oidp, &enabled, 0, req); |
| 167 | if (error || req->newptr == NULL) |
| 168 | return error; |
| 169 | emergency_intr_enable = enabled; |
| 170 | if (emergency_intr_enable) |
| 171 | freq = emergency_intr_freq; |
| 172 | else |
| 173 | freq = 1; |
| 174 | |
| 175 | for (cpuid = 0; cpuid < ncpus; ++cpuid) |
| 176 | systimer_adjust_periodic(&emergency_intr_timer[cpuid], freq); |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | static int |
| 181 | sysctl_emergency_freq(SYSCTL_HANDLER_ARGS) |
| 182 | { |
| 183 | int error, phz, cpuid, freq; |
| 184 | |
| 185 | phz = emergency_intr_freq; |
| 186 | error = sysctl_handle_int(oidp, &phz, 0, req); |
| 187 | if (error || req->newptr == NULL) |
| 188 | return error; |
| 189 | if (phz <= 0) |
| 190 | return EINVAL; |
| 191 | else if (phz > EMERGENCY_INTR_POLLING_FREQ_MAX) |
| 192 | phz = EMERGENCY_INTR_POLLING_FREQ_MAX; |
| 193 | |
| 194 | emergency_intr_freq = phz; |
| 195 | if (emergency_intr_enable) |
| 196 | freq = emergency_intr_freq; |
| 197 | else |
| 198 | freq = 1; |
| 199 | |
| 200 | for (cpuid = 0; cpuid < ncpus; ++cpuid) |
| 201 | systimer_adjust_periodic(&emergency_intr_timer[cpuid], freq); |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * Register an SWI or INTerrupt handler. |
| 207 | */ |
| 208 | void * |
| 209 | register_swi(int intr, inthand2_t *handler, void *arg, const char *name, |
| 210 | struct lwkt_serialize *serializer, int cpuid) |
| 211 | { |
| 212 | if (intr < FIRST_SOFTINT || intr >= MAX_INTS) |
| 213 | panic("register_swi: bad intr %d", intr); |
| 214 | |
| 215 | if (cpuid < 0) |
| 216 | cpuid = intr % ncpus; |
| 217 | return(register_int(intr, handler, arg, name, serializer, 0, cpuid)); |
| 218 | } |
| 219 | |
| 220 | void * |
| 221 | register_swi_mp(int intr, inthand2_t *handler, void *arg, const char *name, |
| 222 | struct lwkt_serialize *serializer, int cpuid) |
| 223 | { |
| 224 | if (intr < FIRST_SOFTINT || intr >= MAX_INTS) |
| 225 | panic("register_swi: bad intr %d", intr); |
| 226 | |
| 227 | if (cpuid < 0) |
| 228 | cpuid = intr % ncpus; |
| 229 | return(register_int(intr, handler, arg, name, serializer, |
| 230 | INTR_MPSAFE, cpuid)); |
| 231 | } |
| 232 | |
| 233 | void * |
| 234 | register_int(int intr, inthand2_t *handler, void *arg, const char *name, |
| 235 | struct lwkt_serialize *serializer, int intr_flags, int cpuid) |
| 236 | { |
| 237 | struct intr_info *info; |
| 238 | struct intrec **list; |
| 239 | intrec_t rec; |
| 240 | int orig_cpuid; |
| 241 | |
| 242 | KKASSERT(cpuid >= 0 && cpuid < ncpus); |
| 243 | |
| 244 | if (intr < 0 || intr >= MAX_INTS) |
| 245 | panic("register_int: bad intr %d", intr); |
| 246 | if (name == NULL) |
| 247 | name = "???"; |
| 248 | info = &intr_info_ary[cpuid][intr]; |
| 249 | |
| 250 | /* |
| 251 | * Construct an interrupt handler record |
| 252 | */ |
| 253 | rec = kmalloc(sizeof(struct intrec), M_DEVBUF, M_INTWAIT); |
| 254 | rec->name = kmalloc(strlen(name) + 1, M_DEVBUF, M_INTWAIT); |
| 255 | strcpy(rec->name, name); |
| 256 | |
| 257 | rec->info = info; |
| 258 | rec->handler = handler; |
| 259 | rec->argument = arg; |
| 260 | rec->intr = intr; |
| 261 | rec->intr_flags = intr_flags; |
| 262 | rec->next = NULL; |
| 263 | rec->serializer = serializer; |
| 264 | |
| 265 | int_moveto_destcpu(&orig_cpuid, cpuid); |
| 266 | |
| 267 | /* |
| 268 | * Create an emergency polling thread and set up a systimer to wake |
| 269 | * it up. |
| 270 | */ |
| 271 | if (emergency_intr_thread[cpuid].td_kstack == NULL) { |
| 272 | lwkt_create(ithread_emergency, NULL, NULL, |
| 273 | &emergency_intr_thread[cpuid], |
| 274 | TDF_NOSTART | TDF_INTTHREAD, cpuid, "ithreadE %d", |
| 275 | cpuid); |
| 276 | systimer_init_periodic_nq(&emergency_intr_timer[cpuid], |
| 277 | emergency_intr_timer_callback, |
| 278 | &emergency_intr_thread[cpuid], |
| 279 | (emergency_intr_enable ? emergency_intr_freq : 1)); |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * Create an interrupt thread if necessary, leave it in an unscheduled |
| 284 | * state. |
| 285 | */ |
| 286 | if (info->i_state == ISTATE_NOTHREAD) { |
| 287 | info->i_state = ISTATE_NORMAL; |
| 288 | lwkt_create(ithread_handler, (void *)(intptr_t)intr, NULL, |
| 289 | &info->i_thread, TDF_NOSTART | TDF_INTTHREAD, cpuid, |
| 290 | "ithread%d %d", intr, cpuid); |
| 291 | if (intr >= FIRST_SOFTINT) |
| 292 | lwkt_setpri(&info->i_thread, TDPRI_SOFT_NORM); |
| 293 | else |
| 294 | lwkt_setpri(&info->i_thread, TDPRI_INT_MED); |
| 295 | info->i_thread.td_preemptable = lwkt_preempt; |
| 296 | } |
| 297 | |
| 298 | list = &info->i_reclist; |
| 299 | |
| 300 | /* |
| 301 | * Keep track of how many fast and slow interrupts we have. |
| 302 | * Set i_mplock_required if any handler in the chain requires |
| 303 | * the MP lock to operate. |
| 304 | */ |
| 305 | if ((intr_flags & INTR_MPSAFE) == 0) |
| 306 | info->i_mplock_required = 1; |
| 307 | if (intr_flags & INTR_CLOCK) |
| 308 | ++info->i_fast; |
| 309 | else |
| 310 | ++info->i_slow; |
| 311 | |
| 312 | /* |
| 313 | * Enable random number generation keying off of this interrupt. |
| 314 | */ |
| 315 | if ((intr_flags & INTR_NOENTROPY) == 0 && info->i_random.sc_enabled == 0) { |
| 316 | info->i_random.sc_enabled = 1; |
| 317 | info->i_random.sc_intr = intr; |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * Add the record to the interrupt list. |
| 322 | */ |
| 323 | crit_enter(); |
| 324 | while (*list != NULL) |
| 325 | list = &(*list)->next; |
| 326 | *list = rec; |
| 327 | crit_exit(); |
| 328 | |
| 329 | /* |
| 330 | * Update max_installed_hard_intr to make the emergency intr poll |
| 331 | * a bit more efficient. |
| 332 | */ |
| 333 | if (intr < FIRST_SOFTINT) { |
| 334 | if (max_installed_hard_intr[cpuid] <= intr) |
| 335 | max_installed_hard_intr[cpuid] = intr + 1; |
| 336 | } |
| 337 | |
| 338 | if (intr >= FIRST_SOFTINT) |
| 339 | swi_info_ary[intr - FIRST_SOFTINT] = info; |
| 340 | |
| 341 | /* |
| 342 | * Setup the machine level interrupt vector |
| 343 | */ |
| 344 | if (intr < FIRST_SOFTINT && info->i_slow + info->i_fast == 1) |
| 345 | machintr_intr_setup(intr, intr_flags); |
| 346 | |
| 347 | int_moveto_origcpu(orig_cpuid, cpuid); |
| 348 | |
| 349 | return(rec); |
| 350 | } |
| 351 | |
| 352 | void |
| 353 | unregister_swi(void *id, int intr, int cpuid) |
| 354 | { |
| 355 | if (cpuid < 0) |
| 356 | cpuid = intr % ncpus; |
| 357 | |
| 358 | unregister_int(id, cpuid); |
| 359 | } |
| 360 | |
| 361 | void |
| 362 | unregister_int(void *id, int cpuid) |
| 363 | { |
| 364 | struct intr_info *info; |
| 365 | struct intrec **list; |
| 366 | intrec_t rec; |
| 367 | int intr, orig_cpuid; |
| 368 | |
| 369 | KKASSERT(cpuid >= 0 && cpuid < ncpus); |
| 370 | |
| 371 | intr = ((intrec_t)id)->intr; |
| 372 | |
| 373 | if (intr < 0 || intr >= MAX_INTS) |
| 374 | panic("register_int: bad intr %d", intr); |
| 375 | |
| 376 | info = &intr_info_ary[cpuid][intr]; |
| 377 | |
| 378 | int_moveto_destcpu(&orig_cpuid, cpuid); |
| 379 | |
| 380 | /* |
| 381 | * Remove the interrupt descriptor, adjust the descriptor count, |
| 382 | * and teardown the machine level vector if this was the last interrupt. |
| 383 | */ |
| 384 | crit_enter(); |
| 385 | list = &info->i_reclist; |
| 386 | while ((rec = *list) != NULL) { |
| 387 | if (rec == id) |
| 388 | break; |
| 389 | list = &rec->next; |
| 390 | } |
| 391 | if (rec) { |
| 392 | intrec_t rec0; |
| 393 | |
| 394 | *list = rec->next; |
| 395 | if (rec->intr_flags & INTR_CLOCK) |
| 396 | --info->i_fast; |
| 397 | else |
| 398 | --info->i_slow; |
| 399 | if (intr < FIRST_SOFTINT && info->i_fast + info->i_slow == 0) |
| 400 | machintr_intr_teardown(intr); |
| 401 | |
| 402 | /* |
| 403 | * Clear i_mplock_required if no handlers in the chain require the |
| 404 | * MP lock. |
| 405 | */ |
| 406 | for (rec0 = info->i_reclist; rec0; rec0 = rec0->next) { |
| 407 | if ((rec0->intr_flags & INTR_MPSAFE) == 0) |
| 408 | break; |
| 409 | } |
| 410 | if (rec0 == NULL) |
| 411 | info->i_mplock_required = 0; |
| 412 | } |
| 413 | |
| 414 | if (intr >= FIRST_SOFTINT && info->i_reclist == NULL) |
| 415 | swi_info_ary[intr - FIRST_SOFTINT] = NULL; |
| 416 | |
| 417 | crit_exit(); |
| 418 | |
| 419 | int_moveto_origcpu(orig_cpuid, cpuid); |
| 420 | |
| 421 | /* |
| 422 | * Free the record. |
| 423 | */ |
| 424 | if (rec != NULL) { |
| 425 | kfree(rec->name, M_DEVBUF); |
| 426 | kfree(rec, M_DEVBUF); |
| 427 | } else { |
| 428 | kprintf("warning: unregister_int: int %d handler for %s not found\n", |
| 429 | intr, ((intrec_t)id)->name); |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | long |
| 434 | get_interrupt_counter(int intr, int cpuid) |
| 435 | { |
| 436 | struct intr_info *info; |
| 437 | |
| 438 | KKASSERT(cpuid >= 0 && cpuid < ncpus); |
| 439 | |
| 440 | if (intr < 0 || intr >= MAX_INTS) |
| 441 | panic("register_int: bad intr %d", intr); |
| 442 | info = &intr_info_ary[cpuid][intr]; |
| 443 | return(info->i_count); |
| 444 | } |
| 445 | |
| 446 | void |
| 447 | register_randintr(int intr) |
| 448 | { |
| 449 | struct intr_info *info; |
| 450 | int cpuid; |
| 451 | |
| 452 | if (intr < 0 || intr >= MAX_INTS) |
| 453 | panic("register_randintr: bad intr %d", intr); |
| 454 | |
| 455 | for (cpuid = 0; cpuid < ncpus; ++cpuid) { |
| 456 | info = &intr_info_ary[cpuid][intr]; |
| 457 | info->i_random.sc_intr = intr; |
| 458 | info->i_random.sc_enabled = 1; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | void |
| 463 | unregister_randintr(int intr) |
| 464 | { |
| 465 | struct intr_info *info; |
| 466 | int cpuid; |
| 467 | |
| 468 | if (intr < 0 || intr >= MAX_INTS) |
| 469 | panic("register_swi: bad intr %d", intr); |
| 470 | |
| 471 | for (cpuid = 0; cpuid < ncpus; ++cpuid) { |
| 472 | info = &intr_info_ary[cpuid][intr]; |
| 473 | info->i_random.sc_enabled = -1; |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | int |
| 478 | next_registered_randintr(int intr) |
| 479 | { |
| 480 | struct intr_info *info; |
| 481 | |
| 482 | if (intr < 0 || intr >= MAX_INTS) |
| 483 | panic("register_swi: bad intr %d", intr); |
| 484 | |
| 485 | while (intr < MAX_INTS) { |
| 486 | int cpuid; |
| 487 | |
| 488 | for (cpuid = 0; cpuid < ncpus; ++cpuid) { |
| 489 | info = &intr_info_ary[cpuid][intr]; |
| 490 | if (info->i_random.sc_enabled > 0) |
| 491 | return intr; |
| 492 | } |
| 493 | ++intr; |
| 494 | } |
| 495 | return intr; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Dispatch an interrupt. If there's nothing to do we have a stray |
| 500 | * interrupt and can just return, leaving the interrupt masked. |
| 501 | * |
| 502 | * We need to schedule the interrupt and set its i_running bit. If |
| 503 | * we are not on the interrupt thread's cpu we have to send a message |
| 504 | * to the correct cpu that will issue the desired action (interlocking |
| 505 | * with the interrupt thread's critical section). We do NOT attempt to |
| 506 | * reschedule interrupts whos i_running bit is already set because |
| 507 | * this would prematurely wakeup a livelock-limited interrupt thread. |
| 508 | * |
| 509 | * i_running is only tested/set on the same cpu as the interrupt thread. |
| 510 | * |
| 511 | * We are NOT in a critical section, which will allow the scheduled |
| 512 | * interrupt to preempt us. The MP lock might *NOT* be held here. |
| 513 | */ |
| 514 | static void |
| 515 | sched_ithd_remote(void *arg) |
| 516 | { |
| 517 | sched_ithd_intern(arg); |
| 518 | } |
| 519 | |
| 520 | static void |
| 521 | sched_ithd_intern(struct intr_info *info) |
| 522 | { |
| 523 | ++info->i_count; |
| 524 | if (info->i_state != ISTATE_NOTHREAD) { |
| 525 | if (info->i_reclist == NULL) { |
| 526 | report_stray_interrupt(info, "sched_ithd"); |
| 527 | } else { |
| 528 | if (info->i_thread.td_gd == mycpu) { |
| 529 | if (info->i_running == 0) { |
| 530 | info->i_running = 1; |
| 531 | if (info->i_state != ISTATE_LIVELOCKED) |
| 532 | lwkt_schedule(&info->i_thread); /* MIGHT PREEMPT */ |
| 533 | } |
| 534 | } else { |
| 535 | lwkt_send_ipiq(info->i_thread.td_gd, sched_ithd_remote, info); |
| 536 | } |
| 537 | } |
| 538 | } else { |
| 539 | report_stray_interrupt(info, "sched_ithd"); |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | void |
| 544 | sched_ithd_soft(int intr) |
| 545 | { |
| 546 | struct intr_info *info; |
| 547 | |
| 548 | KKASSERT(intr >= FIRST_SOFTINT && intr < MAX_INTS); |
| 549 | |
| 550 | info = swi_info_ary[intr - FIRST_SOFTINT]; |
| 551 | if (info != NULL) { |
| 552 | sched_ithd_intern(info); |
| 553 | } else { |
| 554 | kprintf("unregistered softint %d got scheduled on cpu%d\n", |
| 555 | intr, mycpuid); |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | void |
| 560 | sched_ithd_hard(int intr) |
| 561 | { |
| 562 | KKASSERT(intr >= 0 && intr < MAX_HARDINTS); |
| 563 | sched_ithd_intern(&intr_info_ary[mycpuid][intr]); |
| 564 | } |
| 565 | |
| 566 | #ifdef _KERNEL_VIRTUAL |
| 567 | |
| 568 | void |
| 569 | sched_ithd_hard_virtual(int intr) |
| 570 | { |
| 571 | KKASSERT(intr >= 0 && intr < MAX_HARDINTS); |
| 572 | sched_ithd_intern(&intr_info_ary[0][intr]); |
| 573 | } |
| 574 | |
| 575 | void * |
| 576 | register_int_virtual(int intr, inthand2_t *handler, void *arg, const char *name, |
| 577 | struct lwkt_serialize *serializer, int intr_flags) |
| 578 | { |
| 579 | return register_int(intr, handler, arg, name, serializer, intr_flags, 0); |
| 580 | } |
| 581 | |
| 582 | void |
| 583 | unregister_int_virtual(void *id) |
| 584 | { |
| 585 | unregister_int(id, 0); |
| 586 | } |
| 587 | |
| 588 | #endif /* _KERN_VIRTUAL */ |
| 589 | |
| 590 | static void |
| 591 | report_stray_interrupt(struct intr_info *info, const char *func) |
| 592 | { |
| 593 | ++info->i_straycount; |
| 594 | if (info->i_straycount < 10) { |
| 595 | if (info->i_errorticks == ticks) |
| 596 | return; |
| 597 | info->i_errorticks = ticks; |
| 598 | kprintf("%s: stray interrupt %d on cpu%d\n", |
| 599 | func, info->i_intr, mycpuid); |
| 600 | } else if (info->i_straycount == 10) { |
| 601 | kprintf("%s: %ld stray interrupts %d on cpu%d - " |
| 602 | "there will be no further reports\n", func, |
| 603 | info->i_straycount, info->i_intr, mycpuid); |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * This is run from a periodic SYSTIMER (and thus must be MP safe, the BGL |
| 609 | * might not be held). |
| 610 | */ |
| 611 | static void |
| 612 | ithread_livelock_wakeup(systimer_t st, int in_ipi __unused, |
| 613 | struct intrframe *frame __unused) |
| 614 | { |
| 615 | struct intr_info *info; |
| 616 | |
| 617 | info = &intr_info_ary[mycpuid][(int)(intptr_t)st->data]; |
| 618 | if (info->i_state != ISTATE_NOTHREAD) |
| 619 | lwkt_schedule(&info->i_thread); |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Schedule ithread within fast intr handler |
| 624 | * |
| 625 | * XXX Protect sched_ithd_hard() call with gd_intr_nesting_level? |
| 626 | * Interrupts aren't enabled, but still... |
| 627 | */ |
| 628 | static __inline void |
| 629 | ithread_fast_sched(int intr, thread_t td) |
| 630 | { |
| 631 | ++td->td_nest_count; |
| 632 | |
| 633 | /* |
| 634 | * We are already in critical section, exit it now to |
| 635 | * allow preemption. |
| 636 | */ |
| 637 | crit_exit_quick(td); |
| 638 | sched_ithd_hard(intr); |
| 639 | crit_enter_quick(td); |
| 640 | |
| 641 | --td->td_nest_count; |
| 642 | } |
| 643 | |
| 644 | /* |
| 645 | * This function is called directly from the ICU or APIC vector code assembly |
| 646 | * to process an interrupt. The critical section and interrupt deferral |
| 647 | * checks have already been done but the function is entered WITHOUT |
| 648 | * a critical section held. The BGL may or may not be held. |
| 649 | * |
| 650 | * Must return non-zero if we do not want the vector code to re-enable |
| 651 | * the interrupt (which we don't if we have to schedule the interrupt) |
| 652 | */ |
| 653 | int ithread_fast_handler(struct intrframe *frame); |
| 654 | |
| 655 | int |
| 656 | ithread_fast_handler(struct intrframe *frame) |
| 657 | { |
| 658 | int intr; |
| 659 | struct intr_info *info; |
| 660 | struct intrec **list; |
| 661 | int must_schedule; |
| 662 | int got_mplock; |
| 663 | TD_INVARIANTS_DECLARE; |
| 664 | intrec_t rec, nrec; |
| 665 | globaldata_t gd; |
| 666 | thread_t td; |
| 667 | |
| 668 | intr = frame->if_vec; |
| 669 | gd = mycpu; |
| 670 | td = curthread; |
| 671 | |
| 672 | /* We must be in critical section. */ |
| 673 | KKASSERT(td->td_critcount); |
| 674 | |
| 675 | info = &intr_info_ary[mycpuid][intr]; |
| 676 | |
| 677 | /* |
| 678 | * If we are not processing any FAST interrupts, just schedule the thing. |
| 679 | */ |
| 680 | if (info->i_fast == 0) { |
| 681 | ++gd->gd_cnt.v_intr; |
| 682 | ithread_fast_sched(intr, td); |
| 683 | return(1); |
| 684 | } |
| 685 | |
| 686 | /* |
| 687 | * This should not normally occur since interrupts ought to be |
| 688 | * masked if the ithread has been scheduled or is running. |
| 689 | */ |
| 690 | if (info->i_running) |
| 691 | return(1); |
| 692 | |
| 693 | /* |
| 694 | * Bump the interrupt nesting level to process any FAST interrupts. |
| 695 | * Obtain the MP lock as necessary. If the MP lock cannot be obtained, |
| 696 | * schedule the interrupt thread to deal with the issue instead. |
| 697 | * |
| 698 | * To reduce overhead, just leave the MP lock held once it has been |
| 699 | * obtained. |
| 700 | */ |
| 701 | ++gd->gd_intr_nesting_level; |
| 702 | ++gd->gd_cnt.v_intr; |
| 703 | must_schedule = info->i_slow; |
| 704 | got_mplock = 0; |
| 705 | |
| 706 | TD_INVARIANTS_GET(td); |
| 707 | list = &info->i_reclist; |
| 708 | |
| 709 | for (rec = *list; rec; rec = nrec) { |
| 710 | /* rec may be invalid after call */ |
| 711 | nrec = rec->next; |
| 712 | |
| 713 | if (rec->intr_flags & INTR_CLOCK) { |
| 714 | if ((rec->intr_flags & INTR_MPSAFE) == 0 && got_mplock == 0) { |
| 715 | if (try_mplock() == 0) { |
| 716 | /* Couldn't get the MP lock; just schedule it. */ |
| 717 | must_schedule = 1; |
| 718 | break; |
| 719 | } |
| 720 | got_mplock = 1; |
| 721 | } |
| 722 | if (rec->serializer) { |
| 723 | must_schedule += lwkt_serialize_handler_try( |
| 724 | rec->serializer, rec->handler, |
| 725 | rec->argument, frame); |
| 726 | } else { |
| 727 | rec->handler(rec->argument, frame); |
| 728 | } |
| 729 | TD_INVARIANTS_TEST(td, rec->name); |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | /* |
| 734 | * Cleanup |
| 735 | */ |
| 736 | --gd->gd_intr_nesting_level; |
| 737 | if (got_mplock) |
| 738 | rel_mplock(); |
| 739 | |
| 740 | /* |
| 741 | * If we had a problem, or mixed fast and slow interrupt handlers are |
| 742 | * registered, schedule the ithread to catch the missed records (it |
| 743 | * will just re-run all of them). A return value of 0 indicates that |
| 744 | * all handlers have been run and the interrupt can be re-enabled, and |
| 745 | * a non-zero return indicates that the interrupt thread controls |
| 746 | * re-enablement. |
| 747 | */ |
| 748 | if (must_schedule > 0) |
| 749 | ithread_fast_sched(intr, td); |
| 750 | else if (must_schedule == 0) |
| 751 | ++info->i_count; |
| 752 | return(must_schedule); |
| 753 | } |
| 754 | |
| 755 | /* |
| 756 | * Interrupt threads run this as their main loop. |
| 757 | * |
| 758 | * The handler begins execution outside a critical section and no MP lock. |
| 759 | * |
| 760 | * The i_running state starts at 0. When an interrupt occurs, the hardware |
| 761 | * interrupt is disabled and sched_ithd_hard() The HW interrupt remains |
| 762 | * disabled until all routines have run. We then call ithread_done() to |
| 763 | * reenable the HW interrupt and deschedule us until the next interrupt. |
| 764 | * |
| 765 | * We are responsible for atomically checking i_running and ithread_done() |
| 766 | * is responsible for atomically checking for platform-specific delayed |
| 767 | * interrupts. i_running for our irq is only set in the context of our cpu, |
| 768 | * so a critical section is a sufficient interlock. |
| 769 | */ |
| 770 | #define LIVELOCK_TIMEFRAME(freq) ((freq) >> 2) /* 1/4 second */ |
| 771 | |
| 772 | static void |
| 773 | ithread_handler(void *arg) |
| 774 | { |
| 775 | struct intr_info *info; |
| 776 | int use_limit; |
| 777 | __uint32_t lseconds; |
| 778 | int intr, cpuid = mycpuid; |
| 779 | int mpheld; |
| 780 | struct intrec **list; |
| 781 | intrec_t rec, nrec; |
| 782 | globaldata_t gd; |
| 783 | struct systimer ill_timer; /* enforced freq. timer */ |
| 784 | u_int ill_count; /* interrupt livelock counter */ |
| 785 | TD_INVARIANTS_DECLARE; |
| 786 | |
| 787 | ill_count = 0; |
| 788 | intr = (int)(intptr_t)arg; |
| 789 | info = &intr_info_ary[cpuid][intr]; |
| 790 | list = &info->i_reclist; |
| 791 | |
| 792 | /* |
| 793 | * The loop must be entered with one critical section held. The thread |
| 794 | * does not hold the mplock on startup. |
| 795 | */ |
| 796 | gd = mycpu; |
| 797 | lseconds = gd->gd_time_seconds; |
| 798 | crit_enter_gd(gd); |
| 799 | mpheld = 0; |
| 800 | |
| 801 | for (;;) { |
| 802 | /* |
| 803 | * The chain is only considered MPSAFE if all its interrupt handlers |
| 804 | * are MPSAFE. However, if intr_mpsafe has been turned off we |
| 805 | * always operate with the BGL. |
| 806 | */ |
| 807 | if (info->i_mplock_required != mpheld) { |
| 808 | if (info->i_mplock_required) { |
| 809 | KKASSERT(mpheld == 0); |
| 810 | get_mplock(); |
| 811 | mpheld = 1; |
| 812 | } else { |
| 813 | KKASSERT(mpheld != 0); |
| 814 | rel_mplock(); |
| 815 | mpheld = 0; |
| 816 | } |
| 817 | } |
| 818 | |
| 819 | TD_INVARIANTS_GET(gd->gd_curthread); |
| 820 | |
| 821 | /* |
| 822 | * If an interrupt is pending, clear i_running and execute the |
| 823 | * handlers. Note that certain types of interrupts can re-trigger |
| 824 | * and set i_running again. |
| 825 | * |
| 826 | * Each handler is run in a critical section. Note that we run both |
| 827 | * FAST and SLOW designated service routines. |
| 828 | */ |
| 829 | if (info->i_running) { |
| 830 | ++ill_count; |
| 831 | info->i_running = 0; |
| 832 | |
| 833 | if (*list == NULL) |
| 834 | report_stray_interrupt(info, "ithread_handler"); |
| 835 | |
| 836 | for (rec = *list; rec; rec = nrec) { |
| 837 | /* rec may be invalid after call */ |
| 838 | nrec = rec->next; |
| 839 | if (rec->serializer) { |
| 840 | lwkt_serialize_handler_call(rec->serializer, rec->handler, |
| 841 | rec->argument, NULL); |
| 842 | } else { |
| 843 | rec->handler(rec->argument, NULL); |
| 844 | } |
| 845 | TD_INVARIANTS_TEST(gd->gd_curthread, rec->name); |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * This is our interrupt hook to add rate randomness to the random |
| 851 | * number generator. |
| 852 | */ |
| 853 | if (info->i_random.sc_enabled > 0) |
| 854 | add_interrupt_randomness(intr); |
| 855 | |
| 856 | /* |
| 857 | * Unmask the interrupt to allow it to trigger again. This only |
| 858 | * applies to certain types of interrupts (typ level interrupts). |
| 859 | * This can result in the interrupt retriggering, but the retrigger |
| 860 | * will not be processed until we cycle our critical section. |
| 861 | * |
| 862 | * Only unmask interrupts while handlers are installed. It is |
| 863 | * possible to hit a situation where no handlers are installed |
| 864 | * due to a device driver livelocking and then tearing down its |
| 865 | * interrupt on close (the parallel bus being a good example). |
| 866 | */ |
| 867 | if (intr < FIRST_SOFTINT && *list) |
| 868 | machintr_intr_enable(intr); |
| 869 | |
| 870 | /* |
| 871 | * Do a quick exit/enter to catch any higher-priority interrupt |
| 872 | * sources, such as the statclock, so thread time accounting |
| 873 | * will still work. This may also cause an interrupt to re-trigger. |
| 874 | */ |
| 875 | crit_exit_gd(gd); |
| 876 | crit_enter_gd(gd); |
| 877 | |
| 878 | /* |
| 879 | * LIVELOCK STATE MACHINE |
| 880 | */ |
| 881 | switch(info->i_state) { |
| 882 | case ISTATE_NORMAL: |
| 883 | /* |
| 884 | * Reset the count each second. |
| 885 | */ |
| 886 | if (lseconds != gd->gd_time_seconds) { |
| 887 | lseconds = gd->gd_time_seconds; |
| 888 | ill_count = 0; |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * If we did not exceed the frequency limit, we are done. |
| 893 | * If the interrupt has not retriggered we deschedule ourselves. |
| 894 | */ |
| 895 | if (ill_count <= livelock_limit) { |
| 896 | if (info->i_running == 0) { |
| 897 | lwkt_deschedule_self(gd->gd_curthread); |
| 898 | lwkt_switch(); |
| 899 | } |
| 900 | break; |
| 901 | } |
| 902 | |
| 903 | /* |
| 904 | * Otherwise we are livelocked. Set up a periodic systimer |
| 905 | * to wake the thread up at the limit frequency. |
| 906 | */ |
| 907 | kprintf("intr %d on cpu%d at %d/%d hz, livelocked limit engaged!\n", |
| 908 | intr, cpuid, ill_count, livelock_limit); |
| 909 | info->i_state = ISTATE_LIVELOCKED; |
| 910 | if ((use_limit = livelock_limit) < 100) |
| 911 | use_limit = 100; |
| 912 | else if (use_limit > 500000) |
| 913 | use_limit = 500000; |
| 914 | systimer_init_periodic_nq(&ill_timer, ithread_livelock_wakeup, |
| 915 | (void *)(intptr_t)intr, use_limit); |
| 916 | /* fall through */ |
| 917 | case ISTATE_LIVELOCKED: |
| 918 | /* |
| 919 | * Wait for our periodic timer to go off. Since the interrupt |
| 920 | * has re-armed it can still set i_running, but it will not |
| 921 | * reschedule us while we are in a livelocked state. |
| 922 | */ |
| 923 | lwkt_deschedule_self(gd->gd_curthread); |
| 924 | lwkt_switch(); |
| 925 | |
| 926 | /* |
| 927 | * Check once a second to see if the livelock condition no |
| 928 | * longer applies. |
| 929 | */ |
| 930 | if (lseconds != gd->gd_time_seconds) { |
| 931 | lseconds = gd->gd_time_seconds; |
| 932 | if (ill_count < livelock_lowater) { |
| 933 | info->i_state = ISTATE_NORMAL; |
| 934 | systimer_del(&ill_timer); |
| 935 | kprintf("intr %d on cpu%d at %d/%d hz, livelock removed\n", |
| 936 | intr, cpuid, ill_count, livelock_lowater); |
| 937 | } else if (livelock_debug == intr || |
| 938 | (bootverbose && cold)) { |
| 939 | kprintf("intr %d on cpu%d at %d/%d hz, in livelock\n", |
| 940 | intr, cpuid, ill_count, livelock_lowater); |
| 941 | } |
| 942 | ill_count = 0; |
| 943 | } |
| 944 | break; |
| 945 | } |
| 946 | } |
| 947 | /* NOT REACHED */ |
| 948 | } |
| 949 | |
| 950 | /* |
| 951 | * Emergency interrupt polling thread. The thread begins execution |
| 952 | * outside a critical section with the BGL held. |
| 953 | * |
| 954 | * If emergency interrupt polling is enabled, this thread will |
| 955 | * execute all system interrupts not marked INTR_NOPOLL at the |
| 956 | * specified polling frequency. |
| 957 | * |
| 958 | * WARNING! This thread runs *ALL* interrupt service routines that |
| 959 | * are not marked INTR_NOPOLL, which basically means everything except |
| 960 | * the 8254 clock interrupt and the ATA interrupt. It has very high |
| 961 | * overhead and should only be used in situations where the machine |
| 962 | * cannot otherwise be made to work. Due to the severe performance |
| 963 | * degredation, it should not be enabled on production machines. |
| 964 | */ |
| 965 | static void |
| 966 | ithread_emergency(void *arg __unused) |
| 967 | { |
| 968 | globaldata_t gd = mycpu; |
| 969 | struct intr_info *info; |
| 970 | intrec_t rec, nrec; |
| 971 | int intr, cpuid = mycpuid; |
| 972 | TD_INVARIANTS_DECLARE; |
| 973 | |
| 974 | get_mplock(); |
| 975 | crit_enter_gd(gd); |
| 976 | TD_INVARIANTS_GET(gd->gd_curthread); |
| 977 | |
| 978 | for (;;) { |
| 979 | for (intr = 0; intr < max_installed_hard_intr[cpuid]; ++intr) { |
| 980 | info = &intr_info_ary[cpuid][intr]; |
| 981 | for (rec = info->i_reclist; rec; rec = nrec) { |
| 982 | /* rec may be invalid after call */ |
| 983 | nrec = rec->next; |
| 984 | if ((rec->intr_flags & INTR_NOPOLL) == 0) { |
| 985 | if (rec->serializer) { |
| 986 | lwkt_serialize_handler_try(rec->serializer, |
| 987 | rec->handler, rec->argument, NULL); |
| 988 | } else { |
| 989 | rec->handler(rec->argument, NULL); |
| 990 | } |
| 991 | TD_INVARIANTS_TEST(gd->gd_curthread, rec->name); |
| 992 | } |
| 993 | } |
| 994 | } |
| 995 | lwkt_deschedule_self(gd->gd_curthread); |
| 996 | lwkt_switch(); |
| 997 | } |
| 998 | /* NOT REACHED */ |
| 999 | } |
| 1000 | |
| 1001 | /* |
| 1002 | * Systimer callback - schedule the emergency interrupt poll thread |
| 1003 | * if emergency polling is enabled. |
| 1004 | */ |
| 1005 | static |
| 1006 | void |
| 1007 | emergency_intr_timer_callback(systimer_t info, int in_ipi __unused, |
| 1008 | struct intrframe *frame __unused) |
| 1009 | { |
| 1010 | if (emergency_intr_enable) |
| 1011 | lwkt_schedule(info->data); |
| 1012 | } |
| 1013 | |
| 1014 | /* |
| 1015 | * Sysctls used by systat and others: hw.intrnames and hw.intrcnt. |
| 1016 | * The data for this machine dependent, and the declarations are in machine |
| 1017 | * dependent code. The layout of intrnames and intrcnt however is machine |
| 1018 | * independent. |
| 1019 | * |
| 1020 | * We do not know the length of intrcnt and intrnames at compile time, so |
| 1021 | * calculate things at run time. |
| 1022 | */ |
| 1023 | |
| 1024 | static int |
| 1025 | sysctl_intrnames(SYSCTL_HANDLER_ARGS) |
| 1026 | { |
| 1027 | struct intr_info *info; |
| 1028 | intrec_t rec; |
| 1029 | int error = 0; |
| 1030 | int len; |
| 1031 | int intr, cpuid; |
| 1032 | char buf[64]; |
| 1033 | |
| 1034 | for (cpuid = 0; cpuid < ncpus; ++cpuid) { |
| 1035 | for (intr = 0; error == 0 && intr < MAX_INTS; ++intr) { |
| 1036 | info = &intr_info_ary[cpuid][intr]; |
| 1037 | |
| 1038 | len = 0; |
| 1039 | buf[0] = 0; |
| 1040 | for (rec = info->i_reclist; rec; rec = rec->next) { |
| 1041 | ksnprintf(buf + len, sizeof(buf) - len, "%s%s", |
| 1042 | (len ? "/" : ""), rec->name); |
| 1043 | len += strlen(buf + len); |
| 1044 | } |
| 1045 | if (len == 0) { |
| 1046 | ksnprintf(buf, sizeof(buf), "irq%d", intr); |
| 1047 | len = strlen(buf); |
| 1048 | } |
| 1049 | error = SYSCTL_OUT(req, buf, len + 1); |
| 1050 | } |
| 1051 | } |
| 1052 | return (error); |
| 1053 | } |
| 1054 | |
| 1055 | SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD, |
| 1056 | NULL, 0, sysctl_intrnames, "", "Interrupt Names"); |
| 1057 | |
| 1058 | static int |
| 1059 | sysctl_intrcnt_all(SYSCTL_HANDLER_ARGS) |
| 1060 | { |
| 1061 | struct intr_info *info; |
| 1062 | int error = 0; |
| 1063 | int intr, cpuid; |
| 1064 | |
| 1065 | for (cpuid = 0; cpuid < ncpus; ++cpuid) { |
| 1066 | for (intr = 0; intr < MAX_INTS; ++intr) { |
| 1067 | info = &intr_info_ary[cpuid][intr]; |
| 1068 | |
| 1069 | error = SYSCTL_OUT(req, &info->i_count, sizeof(info->i_count)); |
| 1070 | if (error) |
| 1071 | goto failed; |
| 1072 | } |
| 1073 | } |
| 1074 | failed: |
| 1075 | return(error); |
| 1076 | } |
| 1077 | |
| 1078 | SYSCTL_PROC(_hw, OID_AUTO, intrcnt_all, CTLTYPE_OPAQUE | CTLFLAG_RD, |
| 1079 | NULL, 0, sysctl_intrcnt_all, "", "Interrupt Counts"); |
| 1080 | |
| 1081 | SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD, |
| 1082 | NULL, 0, sysctl_intrcnt_all, "", "Interrupt Counts"); |
| 1083 | |
| 1084 | static void |
| 1085 | int_moveto_destcpu(int *orig_cpuid0, int cpuid) |
| 1086 | { |
| 1087 | int orig_cpuid = mycpuid; |
| 1088 | |
| 1089 | if (cpuid != orig_cpuid) |
| 1090 | lwkt_migratecpu(cpuid); |
| 1091 | |
| 1092 | *orig_cpuid0 = orig_cpuid; |
| 1093 | } |
| 1094 | |
| 1095 | static void |
| 1096 | int_moveto_origcpu(int orig_cpuid, int cpuid) |
| 1097 | { |
| 1098 | if (cpuid != orig_cpuid) |
| 1099 | lwkt_migratecpu(orig_cpuid); |
| 1100 | } |
| 1101 | |
| 1102 | static void |
| 1103 | intr_init(void *dummy __unused) |
| 1104 | { |
| 1105 | int cpuid; |
| 1106 | |
| 1107 | kprintf("Initialize MI interrupts\n"); |
| 1108 | |
| 1109 | for (cpuid = 0; cpuid < ncpus; ++cpuid) { |
| 1110 | int intr; |
| 1111 | |
| 1112 | for (intr = 0; intr < MAX_INTS; ++intr) { |
| 1113 | struct intr_info *info = &intr_info_ary[cpuid][intr]; |
| 1114 | |
| 1115 | info->i_cpuid = cpuid; |
| 1116 | info->i_intr = intr; |
| 1117 | } |
| 1118 | } |
| 1119 | } |
| 1120 | SYSINIT(intr_init, SI_BOOT2_FINISH_PIC, SI_ORDER_ANY, intr_init, NULL); |