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 void pci_pir_print_intpin(struct PIR_entry *entry, 96 struct PIR_intpin *intpin, void *arg); 97 static void pci_pir_print_table(void); 98 static uint8_t pci_pir_search_irq(int bus, int device, int pin); 99 static int pci_pir_valid_irq(struct pci_link *pci_link, int irq); 100 static void pci_pir_walk_table(pir_entry_handler *handler, void *arg); 101 102 static MALLOC_DEFINE(M_PIR, "$PIR", "$PIR structures"); 103 104 static struct PIR_table *pci_route_table; 105 static device_t pir_device; 106 static int pci_route_count, pir_bios_irqs, pir_parsed; 107 static TAILQ_HEAD(, pci_link) pci_links; 108 static int pir_interrupt_weight[NUM_ISA_INTERRUPTS]; 109 110 /* sysctl vars */ 111 SYSCTL_DECL(_hw_pci); 112 113 #ifdef PC98 114 /* IRQs 3, 5, 7, 9, 10, 11, 12, 13 */ 115 #define PCI_IRQ_OVERRIDE_MASK 0x3e68 116 #else 117 /* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */ 118 #define PCI_IRQ_OVERRIDE_MASK 0xdef8 119 #endif 120 121 static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK; 122 TUNABLE_INT("hw.pci.irq_override_mask", &pci_irq_override_mask); 123 SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN, 124 &pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK, 125 "Mask of allowed irqs to try to route when it has no good clue about\n" 126 "which irqs it should use."); 127 128 /* 129 * Look for the interrupt routing table. 130 * 131 * We use PCI BIOS's PIR table if it's available. $PIR is the standard way 132 * to do this. Sadly, some machines are not standards conforming and have 133 * _PIR instead. We shrug and cope by looking for both. 134 */ 135 void 136 pci_pir_open(void) 137 { 138 struct PIR_table *pt; 139 uint32_t sigaddr; 140 int i; 141 uint8_t ck, *cv; 142 143 /* 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; 153 154 /* 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 if (bootverbose) { 171 printf("Found $PIR table, %d entries at %p\n", 172 pci_route_count, pci_route_table); 173 pci_pir_print_table(); 174 } 175 } 176 177 /* 178 * Find the pci_link structure for a given link ID. 179 */ 180 static struct pci_link * 181 pci_pir_find_link(uint8_t link_id) 182 { 183 struct pci_link *pci_link; 184 185 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 186 if (pci_link->pl_id == link_id) 187 return (pci_link); 188 } 189 return (NULL); 190 } 191 192 /* 193 * Find the link device associated with a PCI device in the table. 194 */ 195 static void 196 pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin, 197 void *arg) 198 { 199 struct pci_link_lookup *lookup; 200 201 lookup = (struct pci_link_lookup *)arg; 202 if (entry->pe_bus == lookup->bus && 203 entry->pe_device == lookup->device && 204 intpin - entry->pe_intpin == lookup->pin) 205 *lookup->pci_link_ptr = pci_pir_find_link(intpin->link); 206 } 207 208 /* 209 * Check to see if a possible IRQ setting is valid. 210 */ 211 static int 212 pci_pir_valid_irq(struct pci_link *pci_link, int irq) 213 { 214 215 if (!PCI_INTERRUPT_VALID(irq)) 216 return (0); 217 return (pci_link->pl_irqmask & (1 << irq)); 218 } 219 220 /* 221 * Walk the $PIR executing the worker function for each valid intpin entry 222 * in the table. The handler is passed a pointer to both the entry and 223 * the intpin in the entry. 224 */ 225 static void 226 pci_pir_walk_table(pir_entry_handler *handler, void *arg) 227 { 228 struct PIR_entry *entry; 229 struct PIR_intpin *intpin; 230 int i, pin; 231 232 entry = &pci_route_table->pt_entry[0]; 233 for (i = 0; i < pci_route_count; i++, entry++) { 234 intpin = &entry->pe_intpin[0]; 235 for (pin = 0; pin < 4; pin++, intpin++) 236 if (intpin->link != 0) 237 handler(entry, intpin, arg); 238 } 239 } 240 241 static void 242 pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin, 243 void *arg) 244 { 245 struct pci_link *pci_link; 246 247 pci_link = pci_pir_find_link(intpin->link); 248 if (pci_link != NULL) { 249 pci_link->pl_references++; 250 if (intpin->irqs != pci_link->pl_irqmask) { 251 if (bootverbose) 252 printf( 253 "$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n", 254 entry->pe_bus, entry->pe_device, 255 (intpin - entry->pe_intpin) + 'A', 256 pci_link->pl_id); 257 pci_link->pl_irqmask &= intpin->irqs; 258 } 259 } else { 260 pci_link = malloc(sizeof(struct pci_link), M_PIR, M_WAITOK); 261 pci_link->pl_id = intpin->link; 262 pci_link->pl_irqmask = intpin->irqs; 263 pci_link->pl_irq = PCI_INVALID_IRQ; 264 pci_link->pl_references = 1; 265 pci_link->pl_routed = 0; 266 TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links); 267 } 268 } 269 270 /* 271 * Look to see if any of the function on the PCI device at bus/device have 272 * an interrupt routed to intpin 'pin' by the BIOS. 273 */ 274 static uint8_t 275 pci_pir_search_irq(int bus, int device, int pin) 276 { 277 uint32_t value; 278 uint8_t func, maxfunc; 279 280 /* See if we have a valid device at function 0. */ 281 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 282 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 283 return (PCI_INVALID_IRQ); 284 if (value & PCIM_MFDEV) 285 maxfunc = PCI_FUNCMAX; 286 else 287 maxfunc = 0; 288 289 /* Scan all possible functions at this device. */ 290 for (func = 0; func <= maxfunc; func++) { 291 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4); 292 if (value == 0xffffffff) 293 continue; 294 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 295 296 /* 297 * See if it uses the pin in question. Note that the passed 298 * in pin uses 0 for A, .. 3 for D whereas the intpin 299 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 300 */ 301 if (value != pin + 1) 302 continue; 303 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 304 if (bootverbose) 305 printf( 306 "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n", 307 bus, device, pin + 'A', func, value); 308 if (value != PCI_INVALID_IRQ) 309 return (value); 310 } 311 return (PCI_INVALID_IRQ); 312 } 313 314 /* 315 * Try to initialize IRQ based on this device's IRQ. 316 */ 317 static void 318 pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin, 319 void *arg) 320 { 321 struct pci_link *pci_link; 322 uint8_t irq, pin; 323 324 pin = intpin - entry->pe_intpin; 325 pci_link = pci_pir_find_link(intpin->link); 326 irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin); 327 if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq) 328 return; 329 330 /* 331 * If we don't have an IRQ for this link yet, then we trust the 332 * BIOS, even if it seems invalid from the $PIR entries. 333 */ 334 if (pci_link->pl_irq == PCI_INVALID_IRQ) { 335 if (!pci_pir_valid_irq(pci_link, irq)) 336 printf( 337 "$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c is for link %#x\n", 338 irq, entry->pe_bus, entry->pe_device, pin + 'A', 339 pci_link->pl_id); 340 pci_link->pl_irq = irq; 341 pci_link->pl_routed = 1; 342 return; 343 } 344 345 /* 346 * We have an IRQ and it doesn't match the current IRQ for this 347 * link. If the new IRQ is invalid, then warn about it and ignore 348 * it. If the old IRQ is invalid and the new IRQ is valid, then 349 * prefer the new IRQ instead. If both IRQs are valid, then just 350 * use the first one. Note that if we ever get into this situation 351 * we are having to guess which setting the BIOS actually routed. 352 * Perhaps we should just give up instead. 353 */ 354 if (!pci_pir_valid_irq(pci_link, irq)) { 355 printf( 356 "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n", 357 irq, entry->pe_bus, entry->pe_device, pin + 'A', 358 pci_link->pl_id); 359 } else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) { 360 printf( 361 "$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n", 362 irq, entry->pe_bus, entry->pe_device, pin + 'A', 363 pci_link->pl_id, pci_link->pl_irq); 364 pci_link->pl_irq = irq; 365 pci_link->pl_routed = 1; 366 } else 367 printf( 368 "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n", 369 irq, entry->pe_bus, entry->pe_device, pin + 'A', 370 pci_link->pl_id, pci_link->pl_irq); 371 } 372 373 /* 374 * Parse $PIR to enumerate link devices and attempt to determine their 375 * initial state. This could perhaps be cleaner if we had drivers for the 376 * various interrupt routers as they could read the initial IRQ for each 377 * link. 378 */ 379 static void 380 pci_pir_parse(void) 381 { 382 char tunable_buffer[64]; 383 struct pci_link *pci_link; 384 int i, irq; 385 386 /* Only parse once. */ 387 if (pir_parsed) 388 return; 389 pir_parsed = 1; 390 391 /* Enumerate link devices. */ 392 TAILQ_INIT(&pci_links); 393 pci_pir_walk_table(pci_pir_create_links, NULL); 394 if (bootverbose) { 395 printf("$PIR: Links after initial probe:\n"); 396 pci_pir_dump_links(); 397 } 398 399 /* Check for unique IRQ masks. */ 400 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 401 if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask)) 402 pci_link->pl_irq = ffs(pci_link->pl_irqmask) - 1; 403 } 404 405 /* 406 * Check to see if the BIOS has already routed any of the links by 407 * checking each device connected to each link to see if it has a 408 * valid IRQ. 409 */ 410 pci_pir_walk_table(pci_pir_initial_irqs, NULL); 411 if (bootverbose) { 412 printf("$PIR: Links after initial IRQ discovery:\n"); 413 pci_pir_dump_links(); 414 } 415 416 /* 417 * Allow the user to override the IRQ for a given link device. We 418 * allow invalid IRQs to be specified but warn about them. An IRQ 419 * of 255 or 0 clears any preset IRQ. 420 */ 421 i = 0; 422 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 423 snprintf(tunable_buffer, sizeof(tunable_buffer), 424 "hw.pci.link.%#x.irq", pci_link->pl_id); 425 if (getenv_int(tunable_buffer, &irq) == 0) 426 continue; 427 if (irq == 0) 428 irq = PCI_INVALID_IRQ; 429 if (irq != PCI_INVALID_IRQ && 430 !pci_pir_valid_irq(pci_link, irq) && bootverbose) 431 printf( 432 "$PIR: Warning, IRQ %d for link %#x is not listed as valid\n", 433 irq, pci_link->pl_id); 434 pci_link->pl_routed = 0; 435 pci_link->pl_irq = irq; 436 i = 1; 437 } 438 if (bootverbose && i) { 439 printf("$PIR: Links after tunable overrides:\n"); 440 pci_pir_dump_links(); 441 } 442 443 /* 444 * Build initial interrupt weights as well as bitmap of "known-good" 445 * IRQs that the BIOS has already used for PCI link devices. 446 */ 447 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 448 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) 449 continue; 450 pir_bios_irqs |= 1 << pci_link->pl_irq; 451 pir_interrupt_weight[pci_link->pl_irq] += 452 pci_link->pl_references; 453 } 454 if (bootverbose) { 455 printf("$PIR: IRQs used by BIOS: "); 456 pci_print_irqmask(pir_bios_irqs); 457 printf("\n"); 458 printf("$PIR: Interrupt Weights:\n[ "); 459 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 460 printf(" %3d", i); 461 printf(" ]\n[ "); 462 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 463 printf(" %3d", pir_interrupt_weight[i]); 464 printf(" ]\n"); 465 } 466 } 467 468 /* 469 * Use the PCI BIOS to route an interrupt for a given device. 470 * 471 * Input: 472 * AX = PCIBIOS_ROUTE_INTERRUPT 473 * BH = bus 474 * BL = device [7:3] / function [2:0] 475 * CH = IRQ 476 * CL = Interrupt Pin (0x0A = A, ... 0x0D = D) 477 */ 478 static int 479 pci_pir_biosroute(int bus, int device, int func, int pin, int irq) 480 { 481 struct bios_regs args; 482 483 args.eax = PCIBIOS_ROUTE_INTERRUPT; 484 args.ebx = (bus << 8) | (device << 3) | func; 485 args.ecx = (irq << 8) | (0xa + pin); 486 return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))); 487 } 488 489 490 /* 491 * Route a PCI interrupt using a link device from the $PIR. 492 */ 493 int 494 pci_pir_route_interrupt(int bus, int device, int func, int pin) 495 { 496 struct pci_link_lookup lookup; 497 struct pci_link *pci_link; 498 int error, irq; 499 500 if (pci_route_table == NULL) 501 return (PCI_INVALID_IRQ); 502 503 /* Lookup link device for this PCI device/pin. */ 504 pci_link = NULL; 505 lookup.bus = bus; 506 lookup.device = device; 507 lookup.pin = pin - 1; 508 lookup.pci_link_ptr = &pci_link; 509 pci_pir_walk_table(pci_pir_find_link_handler, &lookup); 510 if (pci_link == NULL) { 511 printf("$PIR: No matching entry for %d.%d.INT%c\n", bus, 512 device, pin - 1 + 'A'); 513 return (PCI_INVALID_IRQ); 514 } 515 516 /* 517 * Pick a new interrupt if we don't have one already. We look for 518 * an interrupt from several different sets. First, we check the 519 * set of PCI only interrupts from the $PIR. Second, we check the 520 * set of known-good interrupts that the BIOS has already used. 521 * Lastly, we check the "all possible valid IRQs" set. 522 */ 523 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 524 irq = pci_pir_choose_irq(pci_link, 525 pci_route_table->pt_header.ph_pci_irqs); 526 if (!PCI_INTERRUPT_VALID(irq)) 527 irq = pci_pir_choose_irq(pci_link, pir_bios_irqs); 528 if (!PCI_INTERRUPT_VALID(irq)) 529 irq = pci_pir_choose_irq(pci_link, 530 pci_irq_override_mask); 531 if (!PCI_INTERRUPT_VALID(irq)) { 532 if (bootverbose) 533 printf( 534 "$PIR: Failed to route interrupt for %d:%d INT%c\n", 535 bus, device, pin - 1 + 'A'); 536 return (PCI_INVALID_IRQ); 537 } 538 pci_link->pl_irq = irq; 539 } 540 541 /* Ask the BIOS to route this IRQ if we haven't done so already. */ 542 if (!pci_link->pl_routed) { 543 error = pci_pir_biosroute(bus, device, func, pin - 1, 544 pci_link->pl_irq); 545 546 /* Ignore errors when routing a unique interrupt. */ 547 if (error && !powerof2(pci_link->pl_irqmask)) { 548 printf("$PIR: ROUTE_INTERRUPT failed.\n"); 549 return (PCI_INVALID_IRQ); 550 } 551 pci_link->pl_routed = 1; 552 553 /* Ensure the interrupt is set to level/low trigger. */ 554 KASSERT(pir_device != NULL, ("missing pir device")); 555 BUS_CONFIG_INTR(pir_device, pci_link->pl_irq, 556 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); 557 } 558 if (bootverbose) 559 printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device, 560 pin - 1 + 'A', pci_link->pl_irq); 561 return (pci_link->pl_irq); 562 } 563 564 /* 565 * Try to pick an interrupt for the specified link from the interrupts 566 * set in the mask. 567 */ 568 static int 569 pci_pir_choose_irq(struct pci_link *pci_link, int irqmask) 570 { 571 int i, irq, realmask; 572 573 /* XXX: Need to have a #define of known bad IRQs to also mask out? */ 574 realmask = pci_link->pl_irqmask & irqmask; 575 if (realmask == 0) 576 return (PCI_INVALID_IRQ); 577 578 /* Find IRQ with lowest weight. */ 579 irq = PCI_INVALID_IRQ; 580 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) { 581 if (!(realmask & 1 << i)) 582 continue; 583 if (irq == PCI_INVALID_IRQ || 584 pir_interrupt_weight[i] < pir_interrupt_weight[irq]) 585 irq = i; 586 } 587 if (bootverbose && PCI_INTERRUPT_VALID(irq)) { 588 printf("$PIR: Found IRQ %d for link %#x from ", irq, 589 pci_link->pl_id); 590 pci_print_irqmask(realmask); 591 printf("\n"); 592 } 593 return (irq); 594 } 595 596 static void 597 pci_print_irqmask(u_int16_t irqs) 598 { 599 int i, first; 600 601 if (irqs == 0) { 602 printf("none"); 603 return; 604 } 605 first = 1; 606 for (i = 0; i < 16; i++, irqs >>= 1) 607 if (irqs & 1) { 608 if (!first) 609 printf(" "); 610 else 611 first = 0; 612 printf("%d", i); 613 } 614 } 615 616 /* 617 * Dump the contents of a single intpin entry to the console. 618 */ 619 static void 620 pci_pir_print_intpin(struct PIR_entry *entry, struct PIR_intpin *intpin, 621 void *arg) 622 { 623 624 if (entry->pe_slot == 0) 625 printf("embedded "); 626 else 627 printf("slot %-3d ", entry->pe_slot); 628 printf(" %3d %3d %c 0x%02x ", entry->pe_bus, entry->pe_device, 629 intpin - entry->pe_intpin + 'A', intpin->link); 630 pci_print_irqmask(intpin->irqs); 631 printf("\n"); 632 } 633 634 /* 635 * Dump the contents of a PCI BIOS Interrupt Routing Table to the console. 636 */ 637 static void 638 pci_pir_print_table(void) 639 { 640 641 printf("PCI-Only Interrupts: "); 642 pci_print_irqmask(pci_route_table->pt_header.ph_pci_irqs); 643 printf("\nLocation Bus Device Pin Link IRQs\n"); 644 pci_pir_walk_table(pci_pir_print_intpin, NULL); 645 } 646 647 /* 648 * Display link devices. 649 */ 650 static void 651 pci_pir_dump_links(void) 652 { 653 struct pci_link *pci_link; 654 655 printf("Link IRQ Rtd Ref IRQs\n"); 656 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 657 printf("%#4x %3d %c %3d ", pci_link->pl_id, 658 pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N', 659 pci_link->pl_references); 660 pci_print_irqmask(pci_link->pl_irqmask); 661 printf("\n"); 662 } 663 } 664 665 /* 666 * See if any interrupts for a given PCI bus are routed in the PIR. Don't 667 * even bother looking if the BIOS doesn't support routing anyways. If we 668 * are probing a PCI-PCI bridge, then require_parse will be true and we should 669 * only succeed if a host-PCI bridge has already attached and parsed the PIR. 670 */ 671 int 672 pci_pir_probe(int bus, int require_parse) 673 { 674 int i; 675 676 if (pci_route_table == NULL || (require_parse && !pir_parsed)) 677 return (0); 678 for (i = 0; i < pci_route_count; i++) 679 if (pci_route_table->pt_entry[i].pe_bus == bus) 680 return (1); 681 return (0); 682 } 683 684 /* 685 * The driver for the new-bus psuedo device pir0 for the $PIR table. 686 */ 687 688 static int 689 pir_probe(device_t dev) 690 { 691 char buf[64]; 692 693 snprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries", 694 pci_route_count); 695 device_set_desc_copy(dev, buf); 696 return (0); 697 } 698 699 static int 700 pir_attach(device_t dev) 701 { 702 703 pci_pir_parse(); 704 KASSERT(pir_device == NULL, ("Multiple pir devices")); 705 pir_device = dev; 706 return (0); 707 } 708 709 static void 710 pir_resume_find_device(struct PIR_entry *entry, struct PIR_intpin *intpin, 711 void *arg) 712 { 713 struct pci_dev_lookup *pd; 714 715 pd = (struct pci_dev_lookup *)arg; 716 if (intpin->link != pd->link || pd->bus != -1) 717 return; 718 pd->bus = entry->pe_bus; 719 pd->device = entry->pe_device; 720 pd->pin = intpin - entry->pe_intpin; 721 } 722 723 static int 724 pir_resume(device_t dev) 725 { 726 struct pci_dev_lookup pd; 727 struct pci_link *pci_link; 728 int error; 729 730 /* Ask the BIOS to re-route each link that was already routed. */ 731 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 732 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 733 KASSERT(!pci_link->pl_routed, 734 ("link %#x is routed but has invalid PCI IRQ", 735 pci_link->pl_id)); 736 continue; 737 } 738 if (pci_link->pl_routed) { 739 pd.bus = -1; 740 pd.link = pci_link->pl_id; 741 pci_pir_walk_table(pir_resume_find_device, &pd); 742 KASSERT(pd.bus != -1, 743 ("did not find matching entry for link %#x in the $PIR table", 744 pci_link->pl_id)); 745 if (bootverbose) 746 device_printf(dev, 747 "Using %d.%d.INT%c to route link %#x to IRQ %d\n", 748 pd.bus, pd.device, pd.pin + 'A', 749 pci_link->pl_id, pci_link->pl_irq); 750 error = pci_pir_biosroute(pd.bus, pd.device, 0, pd.pin, 751 pci_link->pl_irq); 752 if (error) 753 device_printf(dev, 754 "ROUTE_INTERRUPT on resume for link %#x failed.\n", 755 pci_link->pl_id); 756 } 757 } 758 return (0); 759 } 760 761 static device_method_t pir_methods[] = { 762 /* Device interface */ 763 DEVMETHOD(device_probe, pir_probe), 764 DEVMETHOD(device_attach, pir_attach), 765 DEVMETHOD(device_resume, pir_resume), 766 767 { 0, 0 } 768 }; 769 770 static driver_t pir_driver = { 771 "pir", 772 pir_methods, 773 1, 774 }; 775 776 static devclass_t pir_devclass; 777 778 DRIVER_MODULE(pir, legacy, pir_driver, pir_devclass, 0, 0); 779