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 * 3. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD: releng/9.1/sys/x86/acpica/madt.c 234147 2012-04-11 20:25:01Z jhb $"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/smp.h> 39 #include <vm/vm.h> 40 #include <vm/pmap.h> 41 42 #include <x86/apicreg.h> 43 #include <machine/intr_machdep.h> 44 #include <machine/apicvar.h> 45 46 #include <contrib/dev/acpica/include/acpi.h> 47 #include <contrib/dev/acpica/include/actables.h> 48 49 #include <dev/acpica/acpivar.h> 50 #include <dev/pci/pcivar.h> 51 52 /* These two arrays are indexed by APIC IDs. */ 53 static struct { 54 void *io_apic; 55 UINT32 io_vector; 56 } *ioapics; 57 58 static struct lapic_info { 59 u_int la_enabled:1; 60 u_int la_acpi_id:8; 61 } lapics[MAX_APIC_ID + 1]; 62 63 static int madt_found_sci_override; 64 static ACPI_TABLE_MADT *madt; 65 static vm_paddr_t madt_physaddr; 66 static vm_offset_t madt_length; 67 68 MALLOC_DEFINE(M_MADT, "madt_table", "ACPI MADT Table Items"); 69 70 static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source); 71 static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source); 72 static int madt_find_cpu(u_int acpi_id, u_int *apic_id); 73 static int madt_find_interrupt(int intr, void **apic, u_int *pin); 74 static void madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg); 75 static void madt_parse_interrupt_override( 76 ACPI_MADT_INTERRUPT_OVERRIDE *intr); 77 static void madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, 78 void *arg __unused); 79 static void madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi); 80 static void madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi); 81 static int madt_probe(void); 82 static int madt_probe_cpus(void); 83 static void madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, 84 void *arg __unused); 85 static void madt_register(void *dummy); 86 static int madt_setup_local(void); 87 static int madt_setup_io(void); 88 static void madt_walk_table(acpi_subtable_handler *handler, void *arg); 89 90 static struct apic_enumerator madt_enumerator = { 91 "MADT", 92 madt_probe, 93 madt_probe_cpus, 94 madt_setup_local, 95 madt_setup_io 96 }; 97 98 /* 99 * Look for an ACPI Multiple APIC Description Table ("APIC") 100 */ 101 static int 102 madt_probe(void) 103 { 104 105 madt_physaddr = acpi_find_table(ACPI_SIG_MADT); 106 if (madt_physaddr == 0) 107 return (ENXIO); 108 return (0); 109 } 110 111 /* 112 * Run through the MP table enumerating CPUs. 113 */ 114 static int 115 madt_probe_cpus(void) 116 { 117 118 madt = acpi_map_table(madt_physaddr, ACPI_SIG_MADT); 119 madt_length = madt->Header.Length; 120 KASSERT(madt != NULL, ("Unable to re-map MADT")); 121 madt_walk_table(madt_probe_cpus_handler, NULL); 122 acpi_unmap_table(madt); 123 madt = NULL; 124 return (0); 125 } 126 127 /* 128 * Initialize the local APIC on the BSP. 129 */ 130 static int 131 madt_setup_local(void) 132 { 133 134 madt = pmap_mapbios(madt_physaddr, madt_length); 135 lapic_init(madt->Address); 136 printf("ACPI APIC Table: <%.*s %.*s>\n", 137 (int)sizeof(madt->Header.OemId), madt->Header.OemId, 138 (int)sizeof(madt->Header.OemTableId), madt->Header.OemTableId); 139 140 /* 141 * We ignore 64-bit local APIC override entries. Should we 142 * perhaps emit a warning here if we find one? 143 */ 144 return (0); 145 } 146 147 /* 148 * Enumerate I/O APICs and setup interrupt sources. 149 */ 150 static int 151 madt_setup_io(void) 152 { 153 void *ioapic; 154 u_int pin; 155 int i; 156 157 /* Try to initialize ACPI so that we can access the FADT. */ 158 i = acpi_Startup(); 159 if (ACPI_FAILURE(i)) { 160 printf("MADT: ACPI Startup failed with %s\n", 161 AcpiFormatException(i)); 162 printf("Try disabling either ACPI or apic support.\n"); 163 panic("Using MADT but ACPI doesn't work"); 164 } 165 166 ioapics = malloc(sizeof(*ioapics) * (MAX_APIC_ID + 1), M_MADT, 167 M_WAITOK | M_ZERO); 168 169 /* First, we run through adding I/O APIC's. */ 170 madt_walk_table(madt_parse_apics, NULL); 171 172 /* Second, we run through the table tweaking interrupt sources. */ 173 madt_walk_table(madt_parse_ints, NULL); 174 175 /* 176 * If there was not an explicit override entry for the SCI, 177 * force it to use level trigger and active-low polarity. 178 */ 179 if (!madt_found_sci_override) { 180 if (madt_find_interrupt(AcpiGbl_FADT.SciInterrupt, &ioapic, 181 &pin) != 0) 182 printf("MADT: Could not find APIC for SCI IRQ %u\n", 183 AcpiGbl_FADT.SciInterrupt); 184 else { 185 printf( 186 "MADT: Forcing active-low polarity and level trigger for SCI\n"); 187 ioapic_set_polarity(ioapic, pin, INTR_POLARITY_LOW); 188 ioapic_set_triggermode(ioapic, pin, INTR_TRIGGER_LEVEL); 189 } 190 } 191 192 /* Third, we register all the I/O APIC's. */ 193 for (i = 0; i <= MAX_APIC_ID; i++) 194 if (ioapics[i].io_apic != NULL) 195 ioapic_register(ioapics[i].io_apic); 196 197 /* Finally, we throw the switch to enable the I/O APIC's. */ 198 acpi_SetDefaultIntrModel(ACPI_INTR_APIC); 199 200 free(ioapics, M_MADT); 201 ioapics = NULL; 202 203 return (0); 204 } 205 206 static void 207 madt_register(void *dummy __unused) 208 { 209 210 apic_register_enumerator(&madt_enumerator); 211 } 212 SYSINIT(madt_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, madt_register, NULL); 213 214 /* 215 * Call the handler routine for each entry in the MADT table. 216 */ 217 static void 218 madt_walk_table(acpi_subtable_handler *handler, void *arg) 219 { 220 221 acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length, 222 handler, arg); 223 } 224 225 static void 226 madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg) 227 { 228 ACPI_MADT_LOCAL_APIC *proc; 229 struct lapic_info *la; 230 231 switch (entry->Type) { 232 case ACPI_MADT_TYPE_LOCAL_APIC: 233 /* 234 * The MADT does not include a BSP flag, so we have to 235 * let the MP code figure out which CPU is the BSP on 236 * its own. 237 */ 238 proc = (ACPI_MADT_LOCAL_APIC *)entry; 239 if (bootverbose) 240 printf("MADT: Found CPU APIC ID %u ACPI ID %u: %s\n", 241 proc->Id, proc->ProcessorId, 242 (proc->LapicFlags & ACPI_MADT_ENABLED) ? 243 "enabled" : "disabled"); 244 if (!(proc->LapicFlags & ACPI_MADT_ENABLED)) 245 break; 246 if (proc->Id > MAX_APIC_ID) 247 panic("%s: CPU ID %u too high", __func__, proc->Id); 248 la = &lapics[proc->Id]; 249 KASSERT(la->la_enabled == 0, 250 ("Duplicate local APIC ID %u", proc->Id)); 251 la->la_enabled = 1; 252 la->la_acpi_id = proc->ProcessorId; 253 lapic_create(proc->Id, 0); 254 break; 255 } 256 } 257 258 259 /* 260 * Add an I/O APIC from an entry in the table. 261 */ 262 static void 263 madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg __unused) 264 { 265 ACPI_MADT_IO_APIC *apic; 266 267 switch (entry->Type) { 268 case ACPI_MADT_TYPE_IO_APIC: 269 apic = (ACPI_MADT_IO_APIC *)entry; 270 if (bootverbose) 271 printf( 272 "MADT: Found IO APIC ID %u, Interrupt %u at %p\n", 273 apic->Id, apic->GlobalIrqBase, 274 (void *)(uintptr_t)apic->Address); 275 if (apic->Id > MAX_APIC_ID) 276 panic("%s: I/O APIC ID %u too high", __func__, 277 apic->Id); 278 if (ioapics[apic->Id].io_apic != NULL) 279 panic("%s: Double APIC ID %u", __func__, apic->Id); 280 if (apic->GlobalIrqBase >= FIRST_MSI_INT) { 281 printf("MADT: Ignoring bogus I/O APIC ID %u", apic->Id); 282 break; 283 } 284 ioapics[apic->Id].io_apic = ioapic_create(apic->Address, 285 apic->Id, apic->GlobalIrqBase); 286 ioapics[apic->Id].io_vector = apic->GlobalIrqBase; 287 break; 288 default: 289 break; 290 } 291 } 292 293 /* 294 * Determine properties of an interrupt source. Note that for ACPI these 295 * functions are only used for ISA interrupts, so we assume ISA bus values 296 * (Active Hi, Edge Triggered) for conforming values except for the ACPI 297 * SCI for which we use Active Lo, Level Triggered. 298 */ 299 static enum intr_polarity 300 interrupt_polarity(UINT16 IntiFlags, UINT8 Source) 301 { 302 303 switch (IntiFlags & ACPI_MADT_POLARITY_MASK) { 304 case ACPI_MADT_POLARITY_CONFORMS: 305 if (Source == AcpiGbl_FADT.SciInterrupt) 306 return (INTR_POLARITY_LOW); 307 else 308 return (INTR_POLARITY_HIGH); 309 case ACPI_MADT_POLARITY_ACTIVE_HIGH: 310 return (INTR_POLARITY_HIGH); 311 case ACPI_MADT_POLARITY_ACTIVE_LOW: 312 return (INTR_POLARITY_LOW); 313 default: 314 panic("Bogus Interrupt Polarity"); 315 } 316 } 317 318 static enum intr_trigger 319 interrupt_trigger(UINT16 IntiFlags, UINT8 Source) 320 { 321 322 switch (IntiFlags & ACPI_MADT_TRIGGER_MASK) { 323 case ACPI_MADT_TRIGGER_CONFORMS: 324 if (Source == AcpiGbl_FADT.SciInterrupt) 325 return (INTR_TRIGGER_LEVEL); 326 else 327 return (INTR_TRIGGER_EDGE); 328 case ACPI_MADT_TRIGGER_EDGE: 329 return (INTR_TRIGGER_EDGE); 330 case ACPI_MADT_TRIGGER_LEVEL: 331 return (INTR_TRIGGER_LEVEL); 332 default: 333 panic("Bogus Interrupt Trigger Mode"); 334 } 335 } 336 337 /* 338 * Find the local APIC ID associated with a given ACPI Processor ID. 339 */ 340 static int 341 madt_find_cpu(u_int acpi_id, u_int *apic_id) 342 { 343 int i; 344 345 for (i = 0; i <= MAX_APIC_ID; i++) { 346 if (!lapics[i].la_enabled) 347 continue; 348 if (lapics[i].la_acpi_id != acpi_id) 349 continue; 350 *apic_id = i; 351 return (0); 352 } 353 return (ENOENT); 354 } 355 356 /* 357 * Find the IO APIC and pin on that APIC associated with a given global 358 * interrupt. 359 */ 360 static int 361 madt_find_interrupt(int intr, void **apic, u_int *pin) 362 { 363 int i, best; 364 365 best = -1; 366 for (i = 0; i <= MAX_APIC_ID; i++) { 367 if (ioapics[i].io_apic == NULL || 368 ioapics[i].io_vector > intr) 369 continue; 370 if (best == -1 || 371 ioapics[best].io_vector < ioapics[i].io_vector) 372 best = i; 373 } 374 if (best == -1) 375 return (ENOENT); 376 *apic = ioapics[best].io_apic; 377 *pin = intr - ioapics[best].io_vector; 378 if (*pin > 32) 379 printf("WARNING: Found intpin of %u for vector %d\n", *pin, 380 intr); 381 return (0); 382 } 383 384 /* 385 * Parse an interrupt source override for an ISA interrupt. 386 */ 387 static void 388 madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr) 389 { 390 void *new_ioapic, *old_ioapic; 391 u_int new_pin, old_pin; 392 enum intr_trigger trig; 393 enum intr_polarity pol; 394 char buf[64]; 395 396 if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 && 397 intr->GlobalIrq == 2) { 398 if (bootverbose) 399 printf("MADT: Skipping timer override\n"); 400 return; 401 } 402 if (bootverbose) 403 printf("MADT: Interrupt override: source %u, irq %u\n", 404 intr->SourceIrq, intr->GlobalIrq); 405 KASSERT(intr->Bus == 0, ("bus for interrupt overrides must be zero")); 406 if (madt_find_interrupt(intr->GlobalIrq, &new_ioapic, &new_pin) != 0) { 407 printf("MADT: Could not find APIC for vector %u (IRQ %u)\n", 408 intr->GlobalIrq, intr->SourceIrq); 409 return; 410 } 411 412 /* 413 * Lookup the appropriate trigger and polarity modes for this 414 * entry. 415 */ 416 trig = interrupt_trigger(intr->IntiFlags, intr->SourceIrq); 417 pol = interrupt_polarity(intr->IntiFlags, intr->SourceIrq); 418 419 /* 420 * If the SCI is identity mapped but has edge trigger and 421 * active-hi polarity or the force_sci_lo tunable is set, 422 * force it to use level/lo. 423 */ 424 if (intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) { 425 madt_found_sci_override = 1; 426 if (getenv_string("hw.acpi.sci.trigger", buf, sizeof(buf))) { 427 if (tolower(buf[0]) == 'e') 428 trig = INTR_TRIGGER_EDGE; 429 else if (tolower(buf[0]) == 'l') 430 trig = INTR_TRIGGER_LEVEL; 431 else 432 panic( 433 "Invalid trigger %s: must be 'edge' or 'level'", 434 buf); 435 printf("MADT: Forcing SCI to %s trigger\n", 436 trig == INTR_TRIGGER_EDGE ? "edge" : "level"); 437 } 438 if (getenv_string("hw.acpi.sci.polarity", buf, sizeof(buf))) { 439 if (tolower(buf[0]) == 'h') 440 pol = INTR_POLARITY_HIGH; 441 else if (tolower(buf[0]) == 'l') 442 pol = INTR_POLARITY_LOW; 443 else 444 panic( 445 "Invalid polarity %s: must be 'high' or 'low'", 446 buf); 447 printf("MADT: Forcing SCI to active %s polarity\n", 448 pol == INTR_POLARITY_HIGH ? "high" : "low"); 449 } 450 } 451 452 /* Remap the IRQ if it is mapped to a different interrupt vector. */ 453 if (intr->SourceIrq != intr->GlobalIrq) { 454 /* 455 * If the SCI is remapped to a non-ISA global interrupt, 456 * then override the vector we use to setup and allocate 457 * the interrupt. 458 */ 459 if (intr->GlobalIrq > 15 && 460 intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) 461 acpi_OverrideInterruptLevel(intr->GlobalIrq); 462 else 463 ioapic_remap_vector(new_ioapic, new_pin, 464 intr->SourceIrq); 465 if (madt_find_interrupt(intr->SourceIrq, &old_ioapic, 466 &old_pin) != 0) 467 printf("MADT: Could not find APIC for source IRQ %u\n", 468 intr->SourceIrq); 469 else if (ioapic_get_vector(old_ioapic, old_pin) == 470 intr->SourceIrq) 471 ioapic_disable_pin(old_ioapic, old_pin); 472 } 473 474 /* Program the polarity and trigger mode. */ 475 ioapic_set_triggermode(new_ioapic, new_pin, trig); 476 ioapic_set_polarity(new_ioapic, new_pin, pol); 477 } 478 479 /* 480 * Parse an entry for an NMI routed to an IO APIC. 481 */ 482 static void 483 madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi) 484 { 485 void *ioapic; 486 u_int pin; 487 488 if (madt_find_interrupt(nmi->GlobalIrq, &ioapic, &pin) != 0) { 489 printf("MADT: Could not find APIC for vector %u\n", 490 nmi->GlobalIrq); 491 return; 492 } 493 494 ioapic_set_nmi(ioapic, pin); 495 if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) 496 ioapic_set_triggermode(ioapic, pin, 497 interrupt_trigger(nmi->IntiFlags, 0)); 498 if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) 499 ioapic_set_polarity(ioapic, pin, 500 interrupt_polarity(nmi->IntiFlags, 0)); 501 } 502 503 /* 504 * Parse an entry for an NMI routed to a local APIC LVT pin. 505 */ 506 static void 507 madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi) 508 { 509 u_int apic_id, pin; 510 511 if (nmi->ProcessorId == 0xff) 512 apic_id = APIC_ID_ALL; 513 else if (madt_find_cpu(nmi->ProcessorId, &apic_id) != 0) { 514 if (bootverbose) 515 printf("MADT: Ignoring local NMI routed to " 516 "ACPI CPU %u\n", nmi->ProcessorId); 517 return; 518 } 519 if (nmi->Lint == 0) 520 pin = LVT_LINT0; 521 else 522 pin = LVT_LINT1; 523 lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI); 524 if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) 525 lapic_set_lvt_triggermode(apic_id, pin, 526 interrupt_trigger(nmi->IntiFlags, 0)); 527 if (!(nmi->IntiFlags & ACPI_MADT_POLARITY_CONFORMS)) 528 lapic_set_lvt_polarity(apic_id, pin, 529 interrupt_polarity(nmi->IntiFlags, 0)); 530 } 531 532 /* 533 * Parse interrupt entries. 534 */ 535 static void 536 madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused) 537 { 538 539 switch (entry->Type) { 540 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 541 madt_parse_interrupt_override( 542 (ACPI_MADT_INTERRUPT_OVERRIDE *)entry); 543 break; 544 case ACPI_MADT_TYPE_NMI_SOURCE: 545 madt_parse_nmi((ACPI_MADT_NMI_SOURCE *)entry); 546 break; 547 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 548 madt_parse_local_nmi((ACPI_MADT_LOCAL_APIC_NMI *)entry); 549 break; 550 } 551 } 552 553 /* 554 * Setup per-CPU ACPI IDs. 555 */ 556 static void 557 madt_set_ids(void *dummy) 558 { 559 struct lapic_info *la; 560 struct pcpu *pc; 561 u_int i; 562 563 if (madt == NULL) 564 return; 565 CPU_FOREACH(i) { 566 pc = pcpu_find(i); 567 KASSERT(pc != NULL, ("no pcpu data for CPU %u", i)); 568 la = &lapics[pc->pc_apic_id]; 569 if (!la->la_enabled) 570 panic("APIC: CPU with APIC ID %u is not enabled", 571 pc->pc_apic_id); 572 pc->pc_acpi_id = la->la_acpi_id; 573 if (bootverbose) 574 printf("APIC: CPU %u has ACPI ID %u\n", i, 575 la->la_acpi_id); 576 } 577 } 578 SYSINIT(madt_set_ids, SI_SUB_CPU, SI_ORDER_ANY, madt_set_ids, NULL);
Cache object: ad37f9445718d4d24a3cb292858ea461
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