1 /*- 2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> 3 * Copyright (c) 2000, Michael Smith <msmith@freebsd.org> 4 * Copyright (c) 2000, BSDi 5 * Copyright (c) 2004, John Baldwin <jhb@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 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/module.h> 39 #include <sys/sysctl.h> 40 #include <vm/vm.h> 41 #include <vm/pmap.h> 42 #include <vm/vm_param.h> 43 #include <machine/md_var.h> 44 #include <dev/pci/pcivar.h> 45 #include <dev/pci/pcireg.h> 46 #include <machine/pci_cfgreg.h> 47 #include <machine/segments.h> 48 #include <machine/pc/bios.h> 49 50 #define NUM_ISA_INTERRUPTS 16 51 52 /* 53 * A link device. Loosely based on the ACPI PCI link device. This doesn't 54 * try to support priorities for different ISA interrupts. 55 */ 56 struct pci_link { 57 TAILQ_ENTRY(pci_link) pl_links; 58 uint8_t pl_id; 59 uint8_t pl_irq; 60 uint16_t pl_irqmask; 61 int pl_references; 62 int pl_routed; 63 }; 64 65 struct pci_link_lookup { 66 struct pci_link **pci_link_ptr; 67 int bus; 68 int device; 69 int pin; 70 }; 71 72 struct pci_dev_lookup { 73 uint8_t link; 74 int bus; 75 int device; 76 int pin; 77 }; 78 79 typedef void pir_entry_handler(struct PIR_entry *entry, 80 struct PIR_intpin* intpin, void *arg); 81 82 static void pci_print_irqmask(u_int16_t irqs); 83 static int pci_pir_biosroute(int bus, int device, int func, int pin, 84 int irq); 85 static int pci_pir_choose_irq(struct pci_link *pci_link, int irqmask); 86 static void pci_pir_create_links(struct PIR_entry *entry, 87 struct PIR_intpin *intpin, void *arg); 88 static void pci_pir_dump_links(void); 89 static struct pci_link *pci_pir_find_link(uint8_t link_id); 90 static void pci_pir_find_link_handler(struct PIR_entry *entry, 91 struct PIR_intpin *intpin, void *arg); 92 static void pci_pir_initial_irqs(struct PIR_entry *entry, 93 struct PIR_intpin *intpin, void *arg); 94 static void pci_pir_parse(void); 95 static uint8_t pci_pir_search_irq(int bus, int device, int pin); 96 static int pci_pir_valid_irq(struct pci_link *pci_link, int irq); 97 static void pci_pir_walk_table(pir_entry_handler *handler, void *arg); 98 99 static MALLOC_DEFINE(M_PIR, "$PIR", "$PIR structures"); 100 101 static struct PIR_table *pci_route_table; 102 static device_t pir_device; 103 static int pci_route_count, pir_bios_irqs, pir_parsed; 104 static TAILQ_HEAD(, pci_link) pci_links; 105 static int pir_interrupt_weight[NUM_ISA_INTERRUPTS]; 106 107 /* sysctl vars */ 108 SYSCTL_DECL(_hw_pci); 109 110 /* XXX this likely should live in a header file */ 111 /* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */ 112 #define PCI_IRQ_OVERRIDE_MASK 0xdef8 113 114 static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK; 115 SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN, 116 &pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK, 117 "Mask of allowed irqs to try to route when it has no good clue about\n" 118 "which irqs it should use."); 119 120 /* 121 * Look for the interrupt routing table. 122 * 123 * We use PCI BIOS's PIR table if it's available. $PIR is the standard way 124 * to do this. Sadly, some machines are not standards conforming and have 125 * _PIR instead. We shrug and cope by looking for both. 126 */ 127 void 128 pci_pir_open(void) 129 { 130 struct PIR_table *pt; 131 uint32_t sigaddr; 132 int i; 133 uint8_t ck, *cv; 134 135 /* Don't try if we've already found a table. */ 136 if (pci_route_table != NULL) 137 return; 138 139 /* Look for $PIR and then _PIR. */ 140 sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0); 141 if (sigaddr == 0) 142 sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0); 143 if (sigaddr == 0) 144 return; 145 146 /* If we found something, check the checksum and length. */ 147 /* XXX - Use pmap_mapdev()? */ 148 pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 149 if (pt->pt_header.ph_length <= sizeof(struct PIR_header)) 150 return; 151 for (cv = (u_int8_t *)pt, ck = 0, i = 0; 152 i < (pt->pt_header.ph_length); i++) 153 ck += cv[i]; 154 if (ck != 0) 155 return; 156 157 /* Ok, we've got a valid table. */ 158 pci_route_table = pt; 159 pci_route_count = (pt->pt_header.ph_length - 160 sizeof(struct PIR_header)) / 161 sizeof(struct PIR_entry); 162 } 163 164 /* 165 * Find the pci_link structure for a given link ID. 166 */ 167 static struct pci_link * 168 pci_pir_find_link(uint8_t link_id) 169 { 170 struct pci_link *pci_link; 171 172 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 173 if (pci_link->pl_id == link_id) 174 return (pci_link); 175 } 176 return (NULL); 177 } 178 179 /* 180 * Find the link device associated with a PCI device in the table. 181 */ 182 static void 183 pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin, 184 void *arg) 185 { 186 struct pci_link_lookup *lookup; 187 188 lookup = (struct pci_link_lookup *)arg; 189 if (entry->pe_bus == lookup->bus && 190 entry->pe_device == lookup->device && 191 intpin - entry->pe_intpin == lookup->pin) 192 *lookup->pci_link_ptr = pci_pir_find_link(intpin->link); 193 } 194 195 /* 196 * Check to see if a possible IRQ setting is valid. 197 */ 198 static int 199 pci_pir_valid_irq(struct pci_link *pci_link, int irq) 200 { 201 202 if (!PCI_INTERRUPT_VALID(irq)) 203 return (0); 204 return (pci_link->pl_irqmask & (1 << irq)); 205 } 206 207 /* 208 * Walk the $PIR executing the worker function for each valid intpin entry 209 * in the table. The handler is passed a pointer to both the entry and 210 * the intpin in the entry. 211 */ 212 static void 213 pci_pir_walk_table(pir_entry_handler *handler, void *arg) 214 { 215 struct PIR_entry *entry; 216 struct PIR_intpin *intpin; 217 int i, pin; 218 219 entry = &pci_route_table->pt_entry[0]; 220 for (i = 0; i < pci_route_count; i++, entry++) { 221 intpin = &entry->pe_intpin[0]; 222 for (pin = 0; pin < 4; pin++, intpin++) 223 if (intpin->link != 0) 224 handler(entry, intpin, arg); 225 } 226 } 227 228 static void 229 pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin, 230 void *arg) 231 { 232 struct pci_link *pci_link; 233 234 pci_link = pci_pir_find_link(intpin->link); 235 if (pci_link != NULL) { 236 pci_link->pl_references++; 237 if (intpin->irqs != pci_link->pl_irqmask) { 238 if (bootverbose) 239 printf( 240 "$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n", 241 entry->pe_bus, entry->pe_device, 242 (intpin - entry->pe_intpin) + 'A', 243 pci_link->pl_id); 244 pci_link->pl_irqmask &= intpin->irqs; 245 } 246 } else { 247 pci_link = malloc(sizeof(struct pci_link), M_PIR, M_WAITOK); 248 pci_link->pl_id = intpin->link; 249 pci_link->pl_irqmask = intpin->irqs; 250 pci_link->pl_irq = PCI_INVALID_IRQ; 251 pci_link->pl_references = 1; 252 pci_link->pl_routed = 0; 253 TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links); 254 } 255 } 256 257 /* 258 * Look to see if any of the function on the PCI device at bus/device have 259 * an interrupt routed to intpin 'pin' by the BIOS. 260 */ 261 static uint8_t 262 pci_pir_search_irq(int bus, int device, int pin) 263 { 264 uint32_t value; 265 uint8_t func, maxfunc; 266 267 /* See if we have a valid device at function 0. */ 268 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 269 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 270 return (PCI_INVALID_IRQ); 271 if (value & PCIM_MFDEV) 272 maxfunc = PCI_FUNCMAX; 273 else 274 maxfunc = 0; 275 276 /* Scan all possible functions at this device. */ 277 for (func = 0; func <= maxfunc; func++) { 278 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4); 279 if (value == 0xffffffff) 280 continue; 281 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 282 283 /* 284 * See if it uses the pin in question. Note that the passed 285 * in pin uses 0 for A, .. 3 for D whereas the intpin 286 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 287 */ 288 if (value != pin + 1) 289 continue; 290 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 291 if (bootverbose) 292 printf( 293 "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n", 294 bus, device, pin + 'A', func, value); 295 if (value != PCI_INVALID_IRQ) 296 return (value); 297 } 298 return (PCI_INVALID_IRQ); 299 } 300 301 /* 302 * Try to initialize IRQ based on this device's IRQ. 303 */ 304 static void 305 pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin, 306 void *arg) 307 { 308 struct pci_link *pci_link; 309 uint8_t irq, pin; 310 311 pin = intpin - entry->pe_intpin; 312 pci_link = pci_pir_find_link(intpin->link); 313 irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin); 314 if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq) 315 return; 316 317 /* Don't trust any BIOS IRQs greater than 15. */ 318 if (irq >= NUM_ISA_INTERRUPTS) { 319 printf( 320 "$PIR: Ignoring invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", 321 irq, entry->pe_bus, entry->pe_device, pin + 'A', 322 pci_link->pl_id); 323 return; 324 } 325 326 /* 327 * If we don't have an IRQ for this link yet, then we trust the 328 * BIOS, even if it seems invalid from the $PIR entries. 329 */ 330 if (pci_link->pl_irq == PCI_INVALID_IRQ) { 331 if (!pci_pir_valid_irq(pci_link, irq)) 332 printf( 333 "$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", 334 irq, entry->pe_bus, entry->pe_device, pin + 'A', 335 pci_link->pl_id); 336 pci_link->pl_irq = irq; 337 pci_link->pl_routed = 1; 338 return; 339 } 340 341 /* 342 * We have an IRQ and it doesn't match the current IRQ for this 343 * link. If the new IRQ is invalid, then warn about it and ignore 344 * it. If the old IRQ is invalid and the new IRQ is valid, then 345 * prefer the new IRQ instead. If both IRQs are valid, then just 346 * use the first one. Note that if we ever get into this situation 347 * we are having to guess which setting the BIOS actually routed. 348 * Perhaps we should just give up instead. 349 */ 350 if (!pci_pir_valid_irq(pci_link, irq)) { 351 printf( 352 "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n", 353 irq, entry->pe_bus, entry->pe_device, pin + 'A', 354 pci_link->pl_id); 355 } else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) { 356 printf( 357 "$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n", 358 irq, entry->pe_bus, entry->pe_device, pin + 'A', 359 pci_link->pl_id, pci_link->pl_irq); 360 pci_link->pl_irq = irq; 361 pci_link->pl_routed = 1; 362 } else 363 printf( 364 "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n", 365 irq, entry->pe_bus, entry->pe_device, pin + 'A', 366 pci_link->pl_id, pci_link->pl_irq); 367 } 368 369 /* 370 * Parse $PIR to enumerate link devices and attempt to determine their 371 * initial state. This could perhaps be cleaner if we had drivers for the 372 * various interrupt routers as they could read the initial IRQ for each 373 * link. 374 */ 375 static void 376 pci_pir_parse(void) 377 { 378 char tunable_buffer[64]; 379 struct pci_link *pci_link; 380 int i, irq; 381 382 /* Only parse once. */ 383 if (pir_parsed) 384 return; 385 pir_parsed = 1; 386 387 /* Enumerate link devices. */ 388 TAILQ_INIT(&pci_links); 389 pci_pir_walk_table(pci_pir_create_links, NULL); 390 if (bootverbose) { 391 printf("$PIR: Links after initial probe:\n"); 392 pci_pir_dump_links(); 393 } 394 395 /* 396 * Check to see if the BIOS has already routed any of the links by 397 * checking each device connected to each link to see if it has a 398 * valid IRQ. 399 */ 400 pci_pir_walk_table(pci_pir_initial_irqs, NULL); 401 if (bootverbose) { 402 printf("$PIR: Links after initial IRQ discovery:\n"); 403 pci_pir_dump_links(); 404 } 405 406 /* 407 * Allow the user to override the IRQ for a given link device. We 408 * allow invalid IRQs to be specified but warn about them. An IRQ 409 * of 255 or 0 clears any preset IRQ. 410 */ 411 i = 0; 412 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 413 snprintf(tunable_buffer, sizeof(tunable_buffer), 414 "hw.pci.link.%#x.irq", pci_link->pl_id); 415 if (getenv_int(tunable_buffer, &irq) == 0) 416 continue; 417 if (irq == 0) 418 irq = PCI_INVALID_IRQ; 419 if (irq != PCI_INVALID_IRQ && 420 !pci_pir_valid_irq(pci_link, irq) && bootverbose) 421 printf( 422 "$PIR: Warning, IRQ %d for link %#x is not listed as valid\n", 423 irq, pci_link->pl_id); 424 pci_link->pl_routed = 0; 425 pci_link->pl_irq = irq; 426 i = 1; 427 } 428 if (bootverbose && i) { 429 printf("$PIR: Links after tunable overrides:\n"); 430 pci_pir_dump_links(); 431 } 432 433 /* 434 * Build initial interrupt weights as well as bitmap of "known-good" 435 * IRQs that the BIOS has already used for PCI link devices. 436 */ 437 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 438 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) 439 continue; 440 pir_bios_irqs |= 1 << pci_link->pl_irq; 441 pir_interrupt_weight[pci_link->pl_irq] += 442 pci_link->pl_references; 443 } 444 if (bootverbose) { 445 printf("$PIR: IRQs used by BIOS: "); 446 pci_print_irqmask(pir_bios_irqs); 447 printf("\n"); 448 printf("$PIR: Interrupt Weights:\n[ "); 449 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 450 printf(" %3d", i); 451 printf(" ]\n[ "); 452 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 453 printf(" %3d", pir_interrupt_weight[i]); 454 printf(" ]\n"); 455 } 456 } 457 458 /* 459 * Use the PCI BIOS to route an interrupt for a given device. 460 * 461 * Input: 462 * AX = PCIBIOS_ROUTE_INTERRUPT 463 * BH = bus 464 * BL = device [7:3] / function [2:0] 465 * CH = IRQ 466 * CL = Interrupt Pin (0x0A = A, ... 0x0D = D) 467 */ 468 static int 469 pci_pir_biosroute(int bus, int device, int func, int pin, int irq) 470 { 471 struct bios_regs args; 472 473 args.eax = PCIBIOS_ROUTE_INTERRUPT; 474 args.ebx = (bus << 8) | (device << 3) | func; 475 args.ecx = (irq << 8) | (0xa + pin); 476 return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))); 477 } 478 479 480 /* 481 * Route a PCI interrupt using a link device from the $PIR. 482 */ 483 int 484 pci_pir_route_interrupt(int bus, int device, int func, int pin) 485 { 486 struct pci_link_lookup lookup; 487 struct pci_link *pci_link; 488 int error, irq; 489 490 if (pci_route_table == NULL) 491 return (PCI_INVALID_IRQ); 492 493 /* Lookup link device for this PCI device/pin. */ 494 pci_link = NULL; 495 lookup.bus = bus; 496 lookup.device = device; 497 lookup.pin = pin - 1; 498 lookup.pci_link_ptr = &pci_link; 499 pci_pir_walk_table(pci_pir_find_link_handler, &lookup); 500 if (pci_link == NULL) { 501 printf("$PIR: No matching entry for %d.%d.INT%c\n", bus, 502 device, pin - 1 + 'A'); 503 return (PCI_INVALID_IRQ); 504 } 505 506 /* 507 * Pick a new interrupt if we don't have one already. We look 508 * for an interrupt from several different sets. First, if 509 * this link only has one valid IRQ, use that. Second, we 510 * check the set of PCI only interrupts from the $PIR. Third, 511 * we check the set of known-good interrupts that the BIOS has 512 * already used. Lastly, we check the "all possible valid 513 * IRQs" set. 514 */ 515 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 516 if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask)) 517 irq = ffs(pci_link->pl_irqmask) - 1; 518 else 519 irq = pci_pir_choose_irq(pci_link, 520 pci_route_table->pt_header.ph_pci_irqs); 521 if (!PCI_INTERRUPT_VALID(irq)) 522 irq = pci_pir_choose_irq(pci_link, pir_bios_irqs); 523 if (!PCI_INTERRUPT_VALID(irq)) 524 irq = pci_pir_choose_irq(pci_link, 525 pci_irq_override_mask); 526 if (!PCI_INTERRUPT_VALID(irq)) { 527 if (bootverbose) 528 printf( 529 "$PIR: Failed to route interrupt for %d:%d INT%c\n", 530 bus, device, pin - 1 + 'A'); 531 return (PCI_INVALID_IRQ); 532 } 533 pci_link->pl_irq = irq; 534 } 535 536 /* Ask the BIOS to route this IRQ if we haven't done so already. */ 537 if (!pci_link->pl_routed) { 538 error = pci_pir_biosroute(bus, device, func, pin - 1, 539 pci_link->pl_irq); 540 541 /* Ignore errors when routing a unique interrupt. */ 542 if (error && !powerof2(pci_link->pl_irqmask)) { 543 printf("$PIR: ROUTE_INTERRUPT failed.\n"); 544 return (PCI_INVALID_IRQ); 545 } 546 pci_link->pl_routed = 1; 547 548 /* Ensure the interrupt is set to level/low trigger. */ 549 KASSERT(pir_device != NULL, ("missing pir device")); 550 BUS_CONFIG_INTR(pir_device, pci_link->pl_irq, 551 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); 552 } 553 if (bootverbose) 554 printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device, 555 pin - 1 + 'A', pci_link->pl_irq); 556 return (pci_link->pl_irq); 557 } 558 559 /* 560 * Try to pick an interrupt for the specified link from the interrupts 561 * set in the mask. 562 */ 563 static int 564 pci_pir_choose_irq(struct pci_link *pci_link, int irqmask) 565 { 566 int i, irq, realmask; 567 568 /* XXX: Need to have a #define of known bad IRQs to also mask out? */ 569 realmask = pci_link->pl_irqmask & irqmask; 570 if (realmask == 0) 571 return (PCI_INVALID_IRQ); 572 573 /* Find IRQ with lowest weight. */ 574 irq = PCI_INVALID_IRQ; 575 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) { 576 if (!(realmask & 1 << i)) 577 continue; 578 if (irq == PCI_INVALID_IRQ || 579 pir_interrupt_weight[i] < pir_interrupt_weight[irq]) 580 irq = i; 581 } 582 if (bootverbose && PCI_INTERRUPT_VALID(irq)) { 583 printf("$PIR: Found IRQ %d for link %#x from ", irq, 584 pci_link->pl_id); 585 pci_print_irqmask(realmask); 586 printf("\n"); 587 } 588 return (irq); 589 } 590 591 static void 592 pci_print_irqmask(u_int16_t irqs) 593 { 594 int i, first; 595 596 if (irqs == 0) { 597 printf("none"); 598 return; 599 } 600 first = 1; 601 for (i = 0; i < 16; i++, irqs >>= 1) 602 if (irqs & 1) { 603 if (!first) 604 printf(" "); 605 else 606 first = 0; 607 printf("%d", i); 608 } 609 } 610 611 /* 612 * Display link devices. 613 */ 614 static void 615 pci_pir_dump_links(void) 616 { 617 struct pci_link *pci_link; 618 619 printf("Link IRQ Rtd Ref IRQs\n"); 620 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 621 printf("%#4x %3d %c %3d ", pci_link->pl_id, 622 pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N', 623 pci_link->pl_references); 624 pci_print_irqmask(pci_link->pl_irqmask); 625 printf("\n"); 626 } 627 } 628 629 /* 630 * See if any interrupts for a given PCI bus are routed in the PIR. Don't 631 * even bother looking if the BIOS doesn't support routing anyways. If we 632 * are probing a PCI-PCI bridge, then require_parse will be true and we should 633 * only succeed if a host-PCI bridge has already attached and parsed the PIR. 634 */ 635 int 636 pci_pir_probe(int bus, int require_parse) 637 { 638 int i; 639 640 if (pci_route_table == NULL || (require_parse && !pir_parsed)) 641 return (0); 642 for (i = 0; i < pci_route_count; i++) 643 if (pci_route_table->pt_entry[i].pe_bus == bus) 644 return (1); 645 return (0); 646 } 647 648 /* 649 * The driver for the new-bus psuedo device pir0 for the $PIR table. 650 */ 651 652 static int 653 pir_probe(device_t dev) 654 { 655 char buf[64]; 656 657 snprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries", 658 pci_route_count); 659 device_set_desc_copy(dev, buf); 660 return (0); 661 } 662 663 static int 664 pir_attach(device_t dev) 665 { 666 667 pci_pir_parse(); 668 KASSERT(pir_device == NULL, ("Multiple pir devices")); 669 pir_device = dev; 670 return (0); 671 } 672 673 static void 674 pir_resume_find_device(struct PIR_entry *entry, struct PIR_intpin *intpin, 675 void *arg) 676 { 677 struct pci_dev_lookup *pd; 678 679 pd = (struct pci_dev_lookup *)arg; 680 if (intpin->link != pd->link || pd->bus != -1) 681 return; 682 pd->bus = entry->pe_bus; 683 pd->device = entry->pe_device; 684 pd->pin = intpin - entry->pe_intpin; 685 } 686 687 static int 688 pir_resume(device_t dev) 689 { 690 struct pci_dev_lookup pd; 691 struct pci_link *pci_link; 692 int error; 693 694 /* Ask the BIOS to re-route each link that was already routed. */ 695 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 696 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 697 KASSERT(!pci_link->pl_routed, 698 ("link %#x is routed but has invalid PCI IRQ", 699 pci_link->pl_id)); 700 continue; 701 } 702 if (pci_link->pl_routed) { 703 pd.bus = -1; 704 pd.link = pci_link->pl_id; 705 pci_pir_walk_table(pir_resume_find_device, &pd); 706 KASSERT(pd.bus != -1, 707 ("did not find matching entry for link %#x in the $PIR table", 708 pci_link->pl_id)); 709 if (bootverbose) 710 device_printf(dev, 711 "Using %d.%d.INT%c to route link %#x to IRQ %d\n", 712 pd.bus, pd.device, pd.pin + 'A', 713 pci_link->pl_id, pci_link->pl_irq); 714 error = pci_pir_biosroute(pd.bus, pd.device, 0, pd.pin, 715 pci_link->pl_irq); 716 if (error) 717 device_printf(dev, 718 "ROUTE_INTERRUPT on resume for link %#x failed.\n", 719 pci_link->pl_id); 720 } 721 } 722 return (0); 723 } 724 725 static device_method_t pir_methods[] = { 726 /* Device interface */ 727 DEVMETHOD(device_probe, pir_probe), 728 DEVMETHOD(device_attach, pir_attach), 729 DEVMETHOD(device_resume, pir_resume), 730 731 { 0, 0 } 732 }; 733 734 static driver_t pir_driver = { 735 "pir", 736 pir_methods, 737 1, 738 }; 739 740 static devclass_t pir_devclass; 741 742 DRIVER_MODULE(pir, legacy, pir_driver, pir_devclass, 0, 0); 743