Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/x86/acpica/madt.c
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1 /*- 2 * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/10.4/sys/x86/acpica/madt.c 288461 2015-10-01 20:54:19Z jhb $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/malloc.h> 35 #include <sys/smp.h> 36 #include <vm/vm.h> 37 #include <vm/pmap.h> 38 39 #include <x86/apicreg.h> 40 #include <machine/intr_machdep.h> 41 #include <machine/apicvar.h> 42 43 #include <contrib/dev/acpica/include/acpi.h> 44 #include <contrib/dev/acpica/include/actables.h> 45 46 #include <dev/acpica/acpivar.h> 47 #include <dev/pci/pcivar.h> 48 49 /* These two arrays are indexed by APIC IDs. */ 50 static struct { 51 void *io_apic; 52 UINT32 io_vector; 53 } *ioapics; 54 55 static struct lapic_info { 56 u_int la_enabled; 57 u_int la_acpi_id; 58 } lapics[MAX_APIC_ID + 1]; 59 60 static int madt_found_sci_override; 61 static ACPI_TABLE_MADT *madt; 62 static vm_paddr_t madt_physaddr; 63 static vm_offset_t madt_length; 64 65 static MALLOC_DEFINE(M_MADT, "madt_table", "ACPI MADT Table Items"); 66 67 static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source); 68 static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source); 69 static int madt_find_cpu(u_int acpi_id, u_int *apic_id); 70 static int madt_find_interrupt(int intr, void **apic, u_int *pin); 71 static void madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg); 72 static void madt_parse_interrupt_override( 73 ACPI_MADT_INTERRUPT_OVERRIDE *intr); 74 static void madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, 75 void *arg __unused); 76 static void madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi); 77 static void madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi); 78 static int madt_probe(void); 79 static int madt_probe_cpus(void); 80 static void madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, 81 void *arg __unused); 82 static void madt_register(void *dummy); 83 static int madt_setup_local(void); 84 static int madt_setup_io(void); 85 static void madt_walk_table(acpi_subtable_handler *handler, void *arg); 86 87 static struct apic_enumerator madt_enumerator = { 88 "MADT", 89 madt_probe, 90 madt_probe_cpus, 91 madt_setup_local, 92 madt_setup_io 93 }; 94 95 /* 96 * Look for an ACPI Multiple APIC Description Table ("APIC") 97 */ 98 static int 99 madt_probe(void) 100 { 101 102 madt_physaddr = acpi_find_table(ACPI_SIG_MADT); 103 if (madt_physaddr == 0) 104 return (ENXIO); 105 return (0); 106 } 107 108 /* 109 * Run through the MP table enumerating CPUs. 110 */ 111 static int 112 madt_probe_cpus(void) 113 { 114 115 madt = acpi_map_table(madt_physaddr, ACPI_SIG_MADT); 116 madt_length = madt->Header.Length; 117 KASSERT(madt != NULL, ("Unable to re-map MADT")); 118 madt_walk_table(madt_probe_cpus_handler, NULL); 119 acpi_unmap_table(madt); 120 madt = NULL; 121 return (0); 122 } 123 124 /* 125 * Initialize the local APIC on the BSP. 126 */ 127 static int 128 madt_setup_local(void) 129 { 130 131 madt = pmap_mapbios(madt_physaddr, madt_length); 132 lapic_init(madt->Address); 133 printf("ACPI APIC Table: <%.*s %.*s>\n", 134 (int)sizeof(madt->Header.OemId), madt->Header.OemId, 135 (int)sizeof(madt->Header.OemTableId), madt->Header.OemTableId); 136 137 /* 138 * We ignore 64-bit local APIC override entries. Should we 139 * perhaps emit a warning here if we find one? 140 */ 141 return (0); 142 } 143 144 /* 145 * Enumerate I/O APICs and setup interrupt sources. 146 */ 147 static int 148 madt_setup_io(void) 149 { 150 void *ioapic; 151 u_int pin; 152 int i; 153 154 /* Try to initialize ACPI so that we can access the FADT. */ 155 i = acpi_Startup(); 156 if (ACPI_FAILURE(i)) { 157 printf("MADT: ACPI Startup failed with %s\n", 158 AcpiFormatException(i)); 159 printf("Try disabling either ACPI or apic support.\n"); 160 panic("Using MADT but ACPI doesn't work"); 161 } 162 163 ioapics = malloc(sizeof(*ioapics) * (MAX_APIC_ID + 1), M_MADT, 164 M_WAITOK | M_ZERO); 165 166 /* First, we run through adding I/O APIC's. */ 167 madt_walk_table(madt_parse_apics, NULL); 168 169 /* Second, we run through the table tweaking interrupt sources. */ 170 madt_walk_table(madt_parse_ints, NULL); 171 172 /* 173 * If there was not an explicit override entry for the SCI, 174 * force it to use level trigger and active-low polarity. 175 */ 176 if (!madt_found_sci_override) { 177 if (madt_find_interrupt(AcpiGbl_FADT.SciInterrupt, &ioapic, 178 &pin) != 0) 179 printf("MADT: Could not find APIC for SCI IRQ %u\n", 180 AcpiGbl_FADT.SciInterrupt); 181 else { 182 printf( 183 "MADT: Forcing active-low polarity and level trigger for SCI\n"); 184 ioapic_set_polarity(ioapic, pin, INTR_POLARITY_LOW); 185 ioapic_set_triggermode(ioapic, pin, INTR_TRIGGER_LEVEL); 186 } 187 } 188 189 /* Third, we register all the I/O APIC's. */ 190 for (i = 0; i <= MAX_APIC_ID; i++) 191 if (ioapics[i].io_apic != NULL) 192 ioapic_register(ioapics[i].io_apic); 193 194 /* Finally, we throw the switch to enable the I/O APIC's. */ 195 acpi_SetDefaultIntrModel(ACPI_INTR_APIC); 196 197 free(ioapics, M_MADT); 198 ioapics = NULL; 199 200 return (0); 201 } 202 203 static void 204 madt_register(void *dummy __unused) 205 { 206 207 apic_register_enumerator(&madt_enumerator); 208 } 209 SYSINIT(madt_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, madt_register, NULL); 210 211 /* 212 * Call the handler routine for each entry in the MADT table. 213 */ 214 static void 215 madt_walk_table(acpi_subtable_handler *handler, void *arg) 216 { 217 218 acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length, 219 handler, arg); 220 } 221 222 static void 223 madt_add_cpu(u_int acpi_id, u_int apic_id, u_int flags) 224 { 225 struct lapic_info *la; 226 227 /* 228 * The MADT does not include a BSP flag, so we have to let the 229 * MP code figure out which CPU is the BSP on its own. 230 */ 231 if (bootverbose) 232 printf("MADT: Found CPU APIC ID %u ACPI ID %u: %s\n", 233 apic_id, acpi_id, flags & ACPI_MADT_ENABLED ? 234 "enabled" : "disabled"); 235 if (!(flags & ACPI_MADT_ENABLED)) 236 return; 237 if (apic_id > MAX_APIC_ID) { 238 printf("MADT: Ignoring local APIC ID %u (too high)\n", 239 apic_id); 240 return; 241 } 242 243 la = &lapics[apic_id]; 244 KASSERT(la->la_enabled == 0, ("Duplicate local APIC ID %u", apic_id)); 245 la->la_enabled = 1; 246 la->la_acpi_id = acpi_id; 247 lapic_create(apic_id, 0); 248 } 249 250 static void 251 madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg) 252 { 253 ACPI_MADT_LOCAL_APIC *proc; 254 ACPI_MADT_LOCAL_X2APIC *x2apic; 255 256 switch (entry->Type) { 257 case ACPI_MADT_TYPE_LOCAL_APIC: 258 proc = (ACPI_MADT_LOCAL_APIC *)entry; 259 madt_add_cpu(proc->ProcessorId, proc->Id, proc->LapicFlags); 260 break; 261 case ACPI_MADT_TYPE_LOCAL_X2APIC: 262 x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry; 263 madt_add_cpu(x2apic->Uid, x2apic->LocalApicId, 264 x2apic->LapicFlags); 265 break; 266 } 267 } 268 269 270 /* 271 * Add an I/O APIC from an entry in the table. 272 */ 273 static void 274 madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg __unused) 275 { 276 ACPI_MADT_IO_APIC *apic; 277 278 switch (entry->Type) { 279 case ACPI_MADT_TYPE_IO_APIC: 280 apic = (ACPI_MADT_IO_APIC *)entry; 281 if (bootverbose) 282 printf( 283 "MADT: Found IO APIC ID %u, Interrupt %u at %p\n", 284 apic->Id, apic->GlobalIrqBase, 285 (void *)(uintptr_t)apic->Address); 286 if (apic->Id > MAX_APIC_ID) 287 panic("%s: I/O APIC ID %u too high", __func__, 288 apic->Id); 289 if (ioapics[apic->Id].io_apic != NULL) 290 panic("%s: Double APIC ID %u", __func__, apic->Id); 291 if (apic->GlobalIrqBase >= FIRST_MSI_INT) { 292 printf("MADT: Ignoring bogus I/O APIC ID %u", apic->Id); 293 break; 294 } 295 ioapics[apic->Id].io_apic = ioapic_create(apic->Address, 296 apic->Id, apic->GlobalIrqBase); 297 ioapics[apic->Id].io_vector = apic->GlobalIrqBase; 298 break; 299 default: 300 break; 301 } 302 } 303 304 /* 305 * Determine properties of an interrupt source. Note that for ACPI these 306 * functions are only used for ISA interrupts, so we assume ISA bus values 307 * (Active Hi, Edge Triggered) for conforming values except for the ACPI 308 * SCI for which we use Active Lo, Level Triggered. 309 */ 310 static enum intr_polarity 311 interrupt_polarity(UINT16 IntiFlags, UINT8 Source) 312 { 313 314 switch (IntiFlags & ACPI_MADT_POLARITY_MASK) { 315 default: 316 printf("WARNING: Bogus Interrupt Polarity. Assume CONFORMS\n"); 317 /* FALLTHROUGH*/ 318 case ACPI_MADT_POLARITY_CONFORMS: 319 if (Source == AcpiGbl_FADT.SciInterrupt) 320 return (INTR_POLARITY_LOW); 321 else 322 return (INTR_POLARITY_HIGH); 323 case ACPI_MADT_POLARITY_ACTIVE_HIGH: 324 return (INTR_POLARITY_HIGH); 325 case ACPI_MADT_POLARITY_ACTIVE_LOW: 326 return (INTR_POLARITY_LOW); 327 } 328 } 329 330 static enum intr_trigger 331 interrupt_trigger(UINT16 IntiFlags, UINT8 Source) 332 { 333 334 switch (IntiFlags & ACPI_MADT_TRIGGER_MASK) { 335 default: 336 printf("WARNING: Bogus Interrupt Trigger Mode. Assume CONFORMS.\n"); 337 /*FALLTHROUGH*/ 338 case ACPI_MADT_TRIGGER_CONFORMS: 339 if (Source == AcpiGbl_FADT.SciInterrupt) 340 return (INTR_TRIGGER_LEVEL); 341 else 342 return (INTR_TRIGGER_EDGE); 343 case ACPI_MADT_TRIGGER_EDGE: 344 return (INTR_TRIGGER_EDGE); 345 case ACPI_MADT_TRIGGER_LEVEL: 346 return (INTR_TRIGGER_LEVEL); 347 } 348 } 349 350 /* 351 * Find the local APIC ID associated with a given ACPI Processor ID. 352 */ 353 static int 354 madt_find_cpu(u_int acpi_id, u_int *apic_id) 355 { 356 int i; 357 358 for (i = 0; i <= MAX_APIC_ID; i++) { 359 if (!lapics[i].la_enabled) 360 continue; 361 if (lapics[i].la_acpi_id != acpi_id) 362 continue; 363 *apic_id = i; 364 return (0); 365 } 366 return (ENOENT); 367 } 368 369 /* 370 * Find the IO APIC and pin on that APIC associated with a given global 371 * interrupt. 372 */ 373 static int 374 madt_find_interrupt(int intr, void **apic, u_int *pin) 375 { 376 int i, best; 377 378 best = -1; 379 for (i = 0; i <= MAX_APIC_ID; i++) { 380 if (ioapics[i].io_apic == NULL || 381 ioapics[i].io_vector > intr) 382 continue; 383 if (best == -1 || 384 ioapics[best].io_vector < ioapics[i].io_vector) 385 best = i; 386 } 387 if (best == -1) 388 return (ENOENT); 389 *apic = ioapics[best].io_apic; 390 *pin = intr - ioapics[best].io_vector; 391 if (*pin > 32) 392 printf("WARNING: Found intpin of %u for vector %d\n", *pin, 393 intr); 394 return (0); 395 } 396 397 /* 398 * Parse an interrupt source override for an ISA interrupt. 399 */ 400 static void 401 madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr) 402 { 403 void *new_ioapic, *old_ioapic; 404 u_int new_pin, old_pin; 405 enum intr_trigger trig; 406 enum intr_polarity pol; 407 char buf[64]; 408 409 if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 && 410 intr->GlobalIrq == 2) { 411 if (bootverbose) 412 printf("MADT: Skipping timer override\n"); 413 return; 414 } 415 if (bootverbose) 416 printf("MADT: Interrupt override: source %u, irq %u\n", 417 intr->SourceIrq, intr->GlobalIrq); 418 KASSERT(intr->Bus == 0, ("bus for interrupt overrides must be zero")); 419 if (madt_find_interrupt(intr->GlobalIrq, &new_ioapic, &new_pin) != 0) { 420 printf("MADT: Could not find APIC for vector %u (IRQ %u)\n", 421 intr->GlobalIrq, intr->SourceIrq); 422 return; 423 } 424 425 /* 426 * Lookup the appropriate trigger and polarity modes for this 427 * entry. 428 */ 429 trig = interrupt_trigger(intr->IntiFlags, intr->SourceIrq); 430 pol = interrupt_polarity(intr->IntiFlags, intr->SourceIrq); 431 432 /* 433 * If the SCI is identity mapped but has edge trigger and 434 * active-hi polarity or the force_sci_lo tunable is set, 435 * force it to use level/lo. 436 */ 437 if (intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) { 438 madt_found_sci_override = 1; 439 if (getenv_string("hw.acpi.sci.trigger", buf, sizeof(buf))) { 440 if (tolower(buf[0]) == 'e') 441 trig = INTR_TRIGGER_EDGE; 442 else if (tolower(buf[0]) == 'l') 443 trig = INTR_TRIGGER_LEVEL; 444 else 445 panic( 446 "Invalid trigger %s: must be 'edge' or 'level'", 447 buf); 448 printf("MADT: Forcing SCI to %s trigger\n", 449 trig == INTR_TRIGGER_EDGE ? "edge" : "level"); 450 } 451 if (getenv_string("hw.acpi.sci.polarity", buf, sizeof(buf))) { 452 if (tolower(buf[0]) == 'h') 453 pol = INTR_POLARITY_HIGH; 454 else if (tolower(buf[0]) == 'l') 455 pol = INTR_POLARITY_LOW; 456 else 457 panic( 458 "Invalid polarity %s: must be 'high' or 'low'", 459 buf); 460 printf("MADT: Forcing SCI to active %s polarity\n", 461 pol == INTR_POLARITY_HIGH ? "high" : "low"); 462 } 463 } 464 465 /* Remap the IRQ if it is mapped to a different interrupt vector. */ 466 if (intr->SourceIrq != intr->GlobalIrq) { 467 /* 468 * If the SCI is remapped to a non-ISA global interrupt, 469 * then override the vector we use to setup and allocate 470 * the interrupt. 471 */ 472 if (intr->GlobalIrq > 15 && 473 intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) 474 acpi_OverrideInterruptLevel(intr->GlobalIrq); 475 else 476 ioapic_remap_vector(new_ioapic, new_pin, 477 intr->SourceIrq); 478 if (madt_find_interrupt(intr->SourceIrq, &old_ioapic, 479 &old_pin) != 0) 480 printf("MADT: Could not find APIC for source IRQ %u\n", 481 intr->SourceIrq); 482 else if (ioapic_get_vector(old_ioapic, old_pin) == 483 intr->SourceIrq) 484 ioapic_disable_pin(old_ioapic, old_pin); 485 } 486 487 /* Program the polarity and trigger mode. */ 488 ioapic_set_triggermode(new_ioapic, new_pin, trig); 489 ioapic_set_polarity(new_ioapic, new_pin, pol); 490 } 491 492 /* 493 * Parse an entry for an NMI routed to an IO APIC. 494 */ 495 static void 496 madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi) 497 { 498 void *ioapic; 499 u_int pin; 500 501 if (madt_find_interrupt(nmi->GlobalIrq, &ioapic, &pin) != 0) { 502 printf("MADT: Could not find APIC for vector %u\n", 503 nmi->GlobalIrq); 504 return; 505 } 506 507 ioapic_set_nmi(ioapic, pin); 508 if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) 509 ioapic_set_triggermode(ioapic, pin, 510 interrupt_trigger(nmi->IntiFlags, 0)); 511 if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) 512 ioapic_set_polarity(ioapic, pin, 513 interrupt_polarity(nmi->IntiFlags, 0)); 514 } 515 516 /* 517 * Parse an entry for an NMI routed to a local APIC LVT pin. 518 */ 519 static void 520 madt_handle_local_nmi(u_int acpi_id, UINT8 Lint, UINT16 IntiFlags) 521 { 522 u_int apic_id, pin; 523 524 if (acpi_id == 0xffffffff) 525 apic_id = APIC_ID_ALL; 526 else if (madt_find_cpu(acpi_id, &apic_id) != 0) { 527 if (bootverbose) 528 printf("MADT: Ignoring local NMI routed to " 529 "ACPI CPU %u\n", acpi_id); 530 return; 531 } 532 if (Lint == 0) 533 pin = APIC_LVT_LINT0; 534 else 535 pin = APIC_LVT_LINT1; 536 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI); 537 if (!(IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) 538 lapic_set_lvt_triggermode(apic_id, pin, 539 interrupt_trigger(IntiFlags, 0)); 540 if (!(IntiFlags & ACPI_MADT_POLARITY_CONFORMS)) 541 lapic_set_lvt_polarity(apic_id, pin, 542 interrupt_polarity(IntiFlags, 0)); 543 } 544 545 static void 546 madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi) 547 { 548 549 madt_handle_local_nmi(nmi->ProcessorId == 0xff ? 0xffffffff : 550 nmi->ProcessorId, nmi->Lint, nmi->IntiFlags); 551 } 552 553 static void 554 madt_parse_local_x2apic_nmi(ACPI_MADT_LOCAL_X2APIC_NMI *nmi) 555 { 556 557 madt_handle_local_nmi(nmi->Uid, nmi->Lint, nmi->IntiFlags); 558 } 559 560 /* 561 * Parse interrupt entries. 562 */ 563 static void 564 madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused) 565 { 566 567 switch (entry->Type) { 568 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 569 madt_parse_interrupt_override( 570 (ACPI_MADT_INTERRUPT_OVERRIDE *)entry); 571 break; 572 case ACPI_MADT_TYPE_NMI_SOURCE: 573 madt_parse_nmi((ACPI_MADT_NMI_SOURCE *)entry); 574 break; 575 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 576 madt_parse_local_nmi((ACPI_MADT_LOCAL_APIC_NMI *)entry); 577 break; 578 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 579 madt_parse_local_x2apic_nmi( 580 (ACPI_MADT_LOCAL_X2APIC_NMI *)entry); 581 break; 582 } 583 } 584 585 /* 586 * Setup per-CPU ACPI IDs. 587 */ 588 static void 589 madt_set_ids(void *dummy) 590 { 591 struct lapic_info *la; 592 struct pcpu *pc; 593 u_int i; 594 595 if (madt == NULL) 596 return; 597 CPU_FOREACH(i) { 598 pc = pcpu_find(i); 599 KASSERT(pc != NULL, ("no pcpu data for CPU %u", i)); 600 la = &lapics[pc->pc_apic_id]; 601 if (!la->la_enabled) 602 panic("APIC: CPU with APIC ID %u is not enabled", 603 pc->pc_apic_id); 604 pc->pc_acpi_id = la->la_acpi_id; 605 if (bootverbose) 606 printf("APIC: CPU %u has ACPI ID %u\n", i, 607 la->la_acpi_id); 608 } 609 } 610 SYSINIT(madt_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, madt_set_ids, NULL);
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