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 #ifdef PC98 112 /* IRQs 3, 5, 7, 9, 10, 11, 12, 13 */ 113 #define PCI_IRQ_OVERRIDE_MASK 0x3e68 114 #else 115 /* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */ 116 #define PCI_IRQ_OVERRIDE_MASK 0xdef8 117 #endif 118 119 static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK; 120 SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN, 121 &pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK, 122 "Mask of allowed irqs to try to route when it has no good clue about\n" 123 "which irqs it should use."); 124 125 /* 126 * Look for the interrupt routing table. 127 * 128 * We use PCI BIOS's PIR table if it's available. $PIR is the standard way 129 * to do this. Sadly, some machines are not standards conforming and have 130 * _PIR instead. We shrug and cope by looking for both. 131 */ 132 void 133 pci_pir_open(void) 134 { 135 struct PIR_table *pt; 136 uint32_t sigaddr; 137 int i; 138 uint8_t ck, *cv; 139 140 #ifdef XEN 141 return; 142 #else 143 /* Don't try if we've already found a table. */ 144 if (pci_route_table != NULL) 145 return; 146 147 /* Look for $PIR and then _PIR. */ 148 sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0); 149 if (sigaddr == 0) 150 sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0); 151 if (sigaddr == 0) 152 return; 153 #endif 154 /* If we found something, check the checksum and length. */ 155 /* XXX - Use pmap_mapdev()? */ 156 pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 157 if (pt->pt_header.ph_length <= sizeof(struct PIR_header)) 158 return; 159 for (cv = (u_int8_t *)pt, ck = 0, i = 0; 160 i < (pt->pt_header.ph_length); i++) 161 ck += cv[i]; 162 if (ck != 0) 163 return; 164 165 /* Ok, we've got a valid table. */ 166 pci_route_table = pt; 167 pci_route_count = (pt->pt_header.ph_length - 168 sizeof(struct PIR_header)) / 169 sizeof(struct PIR_entry); 170 } 171 172 /* 173 * Find the pci_link structure for a given link ID. 174 */ 175 static struct pci_link * 176 pci_pir_find_link(uint8_t link_id) 177 { 178 struct pci_link *pci_link; 179 180 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 181 if (pci_link->pl_id == link_id) 182 return (pci_link); 183 } 184 return (NULL); 185 } 186 187 /* 188 * Find the link device associated with a PCI device in the table. 189 */ 190 static void 191 pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin, 192 void *arg) 193 { 194 struct pci_link_lookup *lookup; 195 196 lookup = (struct pci_link_lookup *)arg; 197 if (entry->pe_bus == lookup->bus && 198 entry->pe_device == lookup->device && 199 intpin - entry->pe_intpin == lookup->pin) 200 *lookup->pci_link_ptr = pci_pir_find_link(intpin->link); 201 } 202 203 /* 204 * Check to see if a possible IRQ setting is valid. 205 */ 206 static int 207 pci_pir_valid_irq(struct pci_link *pci_link, int irq) 208 { 209 210 if (!PCI_INTERRUPT_VALID(irq)) 211 return (0); 212 return (pci_link->pl_irqmask & (1 << irq)); 213 } 214 215 /* 216 * Walk the $PIR executing the worker function for each valid intpin entry 217 * in the table. The handler is passed a pointer to both the entry and 218 * the intpin in the entry. 219 */ 220 static void 221 pci_pir_walk_table(pir_entry_handler *handler, void *arg) 222 { 223 struct PIR_entry *entry; 224 struct PIR_intpin *intpin; 225 int i, pin; 226 227 entry = &pci_route_table->pt_entry[0]; 228 for (i = 0; i < pci_route_count; i++, entry++) { 229 intpin = &entry->pe_intpin[0]; 230 for (pin = 0; pin < 4; pin++, intpin++) 231 if (intpin->link != 0) 232 handler(entry, intpin, arg); 233 } 234 } 235 236 static void 237 pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin, 238 void *arg) 239 { 240 struct pci_link *pci_link; 241 242 pci_link = pci_pir_find_link(intpin->link); 243 if (pci_link != NULL) { 244 pci_link->pl_references++; 245 if (intpin->irqs != pci_link->pl_irqmask) { 246 if (bootverbose) 247 printf( 248 "$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n", 249 entry->pe_bus, entry->pe_device, 250 (intpin - entry->pe_intpin) + 'A', 251 pci_link->pl_id); 252 pci_link->pl_irqmask &= intpin->irqs; 253 } 254 } else { 255 pci_link = malloc(sizeof(struct pci_link), M_PIR, M_WAITOK); 256 pci_link->pl_id = intpin->link; 257 pci_link->pl_irqmask = intpin->irqs; 258 pci_link->pl_irq = PCI_INVALID_IRQ; 259 pci_link->pl_references = 1; 260 pci_link->pl_routed = 0; 261 TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links); 262 } 263 } 264 265 /* 266 * Look to see if any of the function on the PCI device at bus/device have 267 * an interrupt routed to intpin 'pin' by the BIOS. 268 */ 269 static uint8_t 270 pci_pir_search_irq(int bus, int device, int pin) 271 { 272 uint32_t value; 273 uint8_t func, maxfunc; 274 275 /* See if we have a valid device at function 0. */ 276 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 277 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 278 return (PCI_INVALID_IRQ); 279 if (value & PCIM_MFDEV) 280 maxfunc = PCI_FUNCMAX; 281 else 282 maxfunc = 0; 283 284 /* Scan all possible functions at this device. */ 285 for (func = 0; func <= maxfunc; func++) { 286 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4); 287 if (value == 0xffffffff) 288 continue; 289 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 290 291 /* 292 * See if it uses the pin in question. Note that the passed 293 * in pin uses 0 for A, .. 3 for D whereas the intpin 294 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 295 */ 296 if (value != pin + 1) 297 continue; 298 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 299 if (bootverbose) 300 printf( 301 "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n", 302 bus, device, pin + 'A', func, value); 303 if (value != PCI_INVALID_IRQ) 304 return (value); 305 } 306 return (PCI_INVALID_IRQ); 307 } 308 309 /* 310 * Try to initialize IRQ based on this device's IRQ. 311 */ 312 static void 313 pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin, 314 void *arg) 315 { 316 struct pci_link *pci_link; 317 uint8_t irq, pin; 318 319 pin = intpin - entry->pe_intpin; 320 pci_link = pci_pir_find_link(intpin->link); 321 irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin); 322 if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq) 323 return; 324 325 /* Don't trust any BIOS IRQs greater than 15. */ 326 if (irq >= NUM_ISA_INTERRUPTS) { 327 printf( 328 "$PIR: Ignoring invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", 329 irq, entry->pe_bus, entry->pe_device, pin + 'A', 330 pci_link->pl_id); 331 return; 332 } 333 334 /* 335 * If we don't have an IRQ for this link yet, then we trust the 336 * BIOS, even if it seems invalid from the $PIR entries. 337 */ 338 if (pci_link->pl_irq == PCI_INVALID_IRQ) { 339 if (!pci_pir_valid_irq(pci_link, irq)) 340 printf( 341 "$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", 342 irq, entry->pe_bus, entry->pe_device, pin + 'A', 343 pci_link->pl_id); 344 pci_link->pl_irq = irq; 345 pci_link->pl_routed = 1; 346 return; 347 } 348 349 /* 350 * We have an IRQ and it doesn't match the current IRQ for this 351 * link. If the new IRQ is invalid, then warn about it and ignore 352 * it. If the old IRQ is invalid and the new IRQ is valid, then 353 * prefer the new IRQ instead. If both IRQs are valid, then just 354 * use the first one. Note that if we ever get into this situation 355 * we are having to guess which setting the BIOS actually routed. 356 * Perhaps we should just give up instead. 357 */ 358 if (!pci_pir_valid_irq(pci_link, irq)) { 359 printf( 360 "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n", 361 irq, entry->pe_bus, entry->pe_device, pin + 'A', 362 pci_link->pl_id); 363 } else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) { 364 printf( 365 "$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n", 366 irq, entry->pe_bus, entry->pe_device, pin + 'A', 367 pci_link->pl_id, pci_link->pl_irq); 368 pci_link->pl_irq = irq; 369 pci_link->pl_routed = 1; 370 } else 371 printf( 372 "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n", 373 irq, entry->pe_bus, entry->pe_device, pin + 'A', 374 pci_link->pl_id, pci_link->pl_irq); 375 } 376 377 /* 378 * Parse $PIR to enumerate link devices and attempt to determine their 379 * initial state. This could perhaps be cleaner if we had drivers for the 380 * various interrupt routers as they could read the initial IRQ for each 381 * link. 382 */ 383 static void 384 pci_pir_parse(void) 385 { 386 char tunable_buffer[64]; 387 struct pci_link *pci_link; 388 int i, irq; 389 390 /* Only parse once. */ 391 if (pir_parsed) 392 return; 393 pir_parsed = 1; 394 395 /* Enumerate link devices. */ 396 TAILQ_INIT(&pci_links); 397 pci_pir_walk_table(pci_pir_create_links, NULL); 398 if (bootverbose) { 399 printf("$PIR: Links after initial probe:\n"); 400 pci_pir_dump_links(); 401 } 402 403 /* 404 * Check to see if the BIOS has already routed any of the links by 405 * checking each device connected to each link to see if it has a 406 * valid IRQ. 407 */ 408 pci_pir_walk_table(pci_pir_initial_irqs, NULL); 409 if (bootverbose) { 410 printf("$PIR: Links after initial IRQ discovery:\n"); 411 pci_pir_dump_links(); 412 } 413 414 /* 415 * Allow the user to override the IRQ for a given link device. We 416 * allow invalid IRQs to be specified but warn about them. An IRQ 417 * of 255 or 0 clears any preset IRQ. 418 */ 419 i = 0; 420 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 421 snprintf(tunable_buffer, sizeof(tunable_buffer), 422 "hw.pci.link.%#x.irq", pci_link->pl_id); 423 if (getenv_int(tunable_buffer, &irq) == 0) 424 continue; 425 if (irq == 0) 426 irq = PCI_INVALID_IRQ; 427 if (irq != PCI_INVALID_IRQ && 428 !pci_pir_valid_irq(pci_link, irq) && bootverbose) 429 printf( 430 "$PIR: Warning, IRQ %d for link %#x is not listed as valid\n", 431 irq, pci_link->pl_id); 432 pci_link->pl_routed = 0; 433 pci_link->pl_irq = irq; 434 i = 1; 435 } 436 if (bootverbose && i) { 437 printf("$PIR: Links after tunable overrides:\n"); 438 pci_pir_dump_links(); 439 } 440 441 /* 442 * Build initial interrupt weights as well as bitmap of "known-good" 443 * IRQs that the BIOS has already used for PCI link devices. 444 */ 445 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 446 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) 447 continue; 448 pir_bios_irqs |= 1 << pci_link->pl_irq; 449 pir_interrupt_weight[pci_link->pl_irq] += 450 pci_link->pl_references; 451 } 452 if (bootverbose) { 453 printf("$PIR: IRQs used by BIOS: "); 454 pci_print_irqmask(pir_bios_irqs); 455 printf("\n"); 456 printf("$PIR: Interrupt Weights:\n[ "); 457 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 458 printf(" %3d", i); 459 printf(" ]\n[ "); 460 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 461 printf(" %3d", pir_interrupt_weight[i]); 462 printf(" ]\n"); 463 } 464 } 465 466 /* 467 * Use the PCI BIOS to route an interrupt for a given device. 468 * 469 * Input: 470 * AX = PCIBIOS_ROUTE_INTERRUPT 471 * BH = bus 472 * BL = device [7:3] / function [2:0] 473 * CH = IRQ 474 * CL = Interrupt Pin (0x0A = A, ... 0x0D = D) 475 */ 476 static int 477 pci_pir_biosroute(int bus, int device, int func, int pin, int irq) 478 { 479 struct bios_regs args; 480 481 args.eax = PCIBIOS_ROUTE_INTERRUPT; 482 args.ebx = (bus << 8) | (device << 3) | func; 483 args.ecx = (irq << 8) | (0xa + pin); 484 #ifdef XEN 485 return (0); 486 #else 487 return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))); 488 #endif 489 } 490 491 492 /* 493 * Route a PCI interrupt using a link device from the $PIR. 494 */ 495 int 496 pci_pir_route_interrupt(int bus, int device, int func, int pin) 497 { 498 struct pci_link_lookup lookup; 499 struct pci_link *pci_link; 500 int error, irq; 501 502 if (pci_route_table == NULL) 503 return (PCI_INVALID_IRQ); 504 505 /* Lookup link device for this PCI device/pin. */ 506 pci_link = NULL; 507 lookup.bus = bus; 508 lookup.device = device; 509 lookup.pin = pin - 1; 510 lookup.pci_link_ptr = &pci_link; 511 pci_pir_walk_table(pci_pir_find_link_handler, &lookup); 512 if (pci_link == NULL) { 513 printf("$PIR: No matching entry for %d.%d.INT%c\n", bus, 514 device, pin - 1 + 'A'); 515 return (PCI_INVALID_IRQ); 516 } 517 518 /* 519 * Pick a new interrupt if we don't have one already. We look 520 * for an interrupt from several different sets. First, if 521 * this link only has one valid IRQ, use that. Second, we 522 * check the set of PCI only interrupts from the $PIR. Third, 523 * we check the set of known-good interrupts that the BIOS has 524 * already used. Lastly, we check the "all possible valid 525 * IRQs" set. 526 */ 527 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 528 if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask)) 529 irq = ffs(pci_link->pl_irqmask) - 1; 530 else 531 irq = pci_pir_choose_irq(pci_link, 532 pci_route_table->pt_header.ph_pci_irqs); 533 if (!PCI_INTERRUPT_VALID(irq)) 534 irq = pci_pir_choose_irq(pci_link, pir_bios_irqs); 535 if (!PCI_INTERRUPT_VALID(irq)) 536 irq = pci_pir_choose_irq(pci_link, 537 pci_irq_override_mask); 538 if (!PCI_INTERRUPT_VALID(irq)) { 539 if (bootverbose) 540 printf( 541 "$PIR: Failed to route interrupt for %d:%d INT%c\n", 542 bus, device, pin - 1 + 'A'); 543 return (PCI_INVALID_IRQ); 544 } 545 pci_link->pl_irq = irq; 546 } 547 548 /* Ask the BIOS to route this IRQ if we haven't done so already. */ 549 if (!pci_link->pl_routed) { 550 error = pci_pir_biosroute(bus, device, func, pin - 1, 551 pci_link->pl_irq); 552 553 /* Ignore errors when routing a unique interrupt. */ 554 if (error && !powerof2(pci_link->pl_irqmask)) { 555 printf("$PIR: ROUTE_INTERRUPT failed.\n"); 556 return (PCI_INVALID_IRQ); 557 } 558 pci_link->pl_routed = 1; 559 560 /* Ensure the interrupt is set to level/low trigger. */ 561 KASSERT(pir_device != NULL, ("missing pir device")); 562 BUS_CONFIG_INTR(pir_device, pci_link->pl_irq, 563 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); 564 } 565 if (bootverbose) 566 printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device, 567 pin - 1 + 'A', pci_link->pl_irq); 568 return (pci_link->pl_irq); 569 } 570 571 /* 572 * Try to pick an interrupt for the specified link from the interrupts 573 * set in the mask. 574 */ 575 static int 576 pci_pir_choose_irq(struct pci_link *pci_link, int irqmask) 577 { 578 int i, irq, realmask; 579 580 /* XXX: Need to have a #define of known bad IRQs to also mask out? */ 581 realmask = pci_link->pl_irqmask & irqmask; 582 if (realmask == 0) 583 return (PCI_INVALID_IRQ); 584 585 /* Find IRQ with lowest weight. */ 586 irq = PCI_INVALID_IRQ; 587 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) { 588 if (!(realmask & 1 << i)) 589 continue; 590 if (irq == PCI_INVALID_IRQ || 591 pir_interrupt_weight[i] < pir_interrupt_weight[irq]) 592 irq = i; 593 } 594 if (bootverbose && PCI_INTERRUPT_VALID(irq)) { 595 printf("$PIR: Found IRQ %d for link %#x from ", irq, 596 pci_link->pl_id); 597 pci_print_irqmask(realmask); 598 printf("\n"); 599 } 600 return (irq); 601 } 602 603 static void 604 pci_print_irqmask(u_int16_t irqs) 605 { 606 int i, first; 607 608 if (irqs == 0) { 609 printf("none"); 610 return; 611 } 612 first = 1; 613 for (i = 0; i < 16; i++, irqs >>= 1) 614 if (irqs & 1) { 615 if (!first) 616 printf(" "); 617 else 618 first = 0; 619 printf("%d", i); 620 } 621 } 622 623 /* 624 * Display link devices. 625 */ 626 static void 627 pci_pir_dump_links(void) 628 { 629 struct pci_link *pci_link; 630 631 printf("Link IRQ Rtd Ref IRQs\n"); 632 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 633 printf("%#4x %3d %c %3d ", pci_link->pl_id, 634 pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N', 635 pci_link->pl_references); 636 pci_print_irqmask(pci_link->pl_irqmask); 637 printf("\n"); 638 } 639 } 640 641 /* 642 * See if any interrupts for a given PCI bus are routed in the PIR. Don't 643 * even bother looking if the BIOS doesn't support routing anyways. If we 644 * are probing a PCI-PCI bridge, then require_parse will be true and we should 645 * only succeed if a host-PCI bridge has already attached and parsed the PIR. 646 */ 647 int 648 pci_pir_probe(int bus, int require_parse) 649 { 650 int i; 651 652 if (pci_route_table == NULL || (require_parse && !pir_parsed)) 653 return (0); 654 for (i = 0; i < pci_route_count; i++) 655 if (pci_route_table->pt_entry[i].pe_bus == bus) 656 return (1); 657 return (0); 658 } 659 660 /* 661 * The driver for the new-bus psuedo device pir0 for the $PIR table. 662 */ 663 664 static int 665 pir_probe(device_t dev) 666 { 667 char buf[64]; 668 669 snprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries", 670 pci_route_count); 671 device_set_desc_copy(dev, buf); 672 return (0); 673 } 674 675 static int 676 pir_attach(device_t dev) 677 { 678 679 pci_pir_parse(); 680 KASSERT(pir_device == NULL, ("Multiple pir devices")); 681 pir_device = dev; 682 return (0); 683 } 684 685 static void 686 pir_resume_find_device(struct PIR_entry *entry, struct PIR_intpin *intpin, 687 void *arg) 688 { 689 struct pci_dev_lookup *pd; 690 691 pd = (struct pci_dev_lookup *)arg; 692 if (intpin->link != pd->link || pd->bus != -1) 693 return; 694 pd->bus = entry->pe_bus; 695 pd->device = entry->pe_device; 696 pd->pin = intpin - entry->pe_intpin; 697 } 698 699 static int 700 pir_resume(device_t dev) 701 { 702 struct pci_dev_lookup pd; 703 struct pci_link *pci_link; 704 int error; 705 706 /* Ask the BIOS to re-route each link that was already routed. */ 707 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 708 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 709 KASSERT(!pci_link->pl_routed, 710 ("link %#x is routed but has invalid PCI IRQ", 711 pci_link->pl_id)); 712 continue; 713 } 714 if (pci_link->pl_routed) { 715 pd.bus = -1; 716 pd.link = pci_link->pl_id; 717 pci_pir_walk_table(pir_resume_find_device, &pd); 718 KASSERT(pd.bus != -1, 719 ("did not find matching entry for link %#x in the $PIR table", 720 pci_link->pl_id)); 721 if (bootverbose) 722 device_printf(dev, 723 "Using %d.%d.INT%c to route link %#x to IRQ %d\n", 724 pd.bus, pd.device, pd.pin + 'A', 725 pci_link->pl_id, pci_link->pl_irq); 726 error = pci_pir_biosroute(pd.bus, pd.device, 0, pd.pin, 727 pci_link->pl_irq); 728 if (error) 729 device_printf(dev, 730 "ROUTE_INTERRUPT on resume for link %#x failed.\n", 731 pci_link->pl_id); 732 } 733 } 734 return (0); 735 } 736 737 static device_method_t pir_methods[] = { 738 /* Device interface */ 739 DEVMETHOD(device_probe, pir_probe), 740 DEVMETHOD(device_attach, pir_attach), 741 DEVMETHOD(device_resume, pir_resume), 742 743 { 0, 0 } 744 }; 745 746 static driver_t pir_driver = { 747 "pir", 748 pir_methods, 749 1, 750 }; 751 752 static devclass_t pir_devclass; 753 754 DRIVER_MODULE(pir, legacy, pir_driver, pir_devclass, 0, 0); 755