1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> 5 * Copyright (c) 2000, Michael Smith <msmith@freebsd.org> 6 * Copyright (c) 2000, BSDi 7 * All rights reserved. 8 * Copyright (c) 2004, John Baldwin <jhb@FreeBSD.org> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice unmodified, this list of conditions, and the following 15 * disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD$"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/bus.h> 38#include <sys/kernel.h> 39#include <sys/malloc.h> 40#include <sys/module.h> 41#include <sys/sysctl.h> 42#include <vm/vm.h> 43#include <vm/pmap.h> 44#include <vm/vm_param.h> 45#include <machine/md_var.h> 46#include <dev/pci/pcivar.h> 47#include <dev/pci/pcireg.h> 48#include <machine/pci_cfgreg.h> 49#include <machine/segments.h> 50#include <machine/pc/bios.h> 51 52#define NUM_ISA_INTERRUPTS 16 53 54/* 55 * A link device. Loosely based on the ACPI PCI link device. This doesn't 56 * try to support priorities for different ISA interrupts. 57 */ 58struct pci_link { 59 TAILQ_ENTRY(pci_link) pl_links; 60 uint8_t pl_id; 61 uint8_t pl_irq; 62 uint16_t pl_irqmask; 63 int pl_references; 64 int pl_routed; 65}; 66 67struct pci_link_lookup { 68 struct pci_link **pci_link_ptr; 69 int bus; 70 int device; 71 int pin; 72}; 73 74struct pci_dev_lookup { 75 uint8_t link; 76 int bus; 77 int device; 78 int pin; 79}; 80 81typedef void pir_entry_handler(struct PIR_entry *entry, 82 struct PIR_intpin* intpin, void *arg); 83 84static void pci_print_irqmask(u_int16_t irqs); 85static int pci_pir_biosroute(int bus, int device, int func, int pin, 86 int irq); 87static int pci_pir_choose_irq(struct pci_link *pci_link, int irqmask); 88static void pci_pir_create_links(struct PIR_entry *entry, 89 struct PIR_intpin *intpin, void *arg); 90static void pci_pir_dump_links(void); 91static struct pci_link *pci_pir_find_link(uint8_t link_id); 92static void pci_pir_find_link_handler(struct PIR_entry *entry, 93 struct PIR_intpin *intpin, void *arg); 94static void pci_pir_initial_irqs(struct PIR_entry *entry, 95 struct PIR_intpin *intpin, void *arg); 96static void pci_pir_parse(void); 97static uint8_t pci_pir_search_irq(int bus, int device, int pin); 98static int pci_pir_valid_irq(struct pci_link *pci_link, int irq); 99static void pci_pir_walk_table(pir_entry_handler *handler, void *arg); 100 101static MALLOC_DEFINE(M_PIR, "$PIR", "$PIR structures"); 102 103static struct PIR_table *pci_route_table; 104static device_t pir_device; 105static int pci_route_count, pir_bios_irqs, pir_parsed; 106static TAILQ_HEAD(, pci_link) pci_links; 107static int pir_interrupt_weight[NUM_ISA_INTERRUPTS]; 108 109/* sysctl vars */ 110SYSCTL_DECL(_hw_pci); 111 112/* XXX this likely should live in a header file */ 113/* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */ 114#define PCI_IRQ_OVERRIDE_MASK 0xdef8 115 116static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK; 117SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN, 118 &pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK, 119 "Mask of allowed irqs to try to route when it has no good clue about\n" 120 "which irqs it should use."); 121 122/* 123 * Look for the interrupt routing table. 124 * 125 * We use PCI BIOS's PIR table if it's available. $PIR is the standard way 126 * to do this. Sadly, some machines are not standards conforming and have 127 * _PIR instead. We shrug and cope by looking for both. 128 */ 129void 130pci_pir_open(void) 131{ 132 struct PIR_table *pt; 133 uint32_t sigaddr; 134 int i; 135 uint8_t ck, *cv; 136 137 /* Don't try if we've already found a table. */ 138 if (pci_route_table != NULL) 139 return; 140 141 /* Look for $PIR and then _PIR. */ 142 sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0); 143 if (sigaddr == 0) 144 sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0); 145 if (sigaddr == 0) 146 return; 147 148 /* If we found something, check the checksum and length. */ 149 /* XXX - Use pmap_mapdev()? */ 150 pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 151 if (pt->pt_header.ph_length <= sizeof(struct PIR_header)) 152 return; 153 for (cv = (u_int8_t *)pt, ck = 0, i = 0; 154 i < (pt->pt_header.ph_length); i++) 155 ck += cv[i]; 156 if (ck != 0) 157 return; 158 159 /* Ok, we've got a valid table. */ 160 pci_route_table = pt; 161 pci_route_count = (pt->pt_header.ph_length - 162 sizeof(struct PIR_header)) / 163 sizeof(struct PIR_entry); 164} 165 166/* 167 * Find the pci_link structure for a given link ID. 168 */ 169static struct pci_link * 170pci_pir_find_link(uint8_t link_id) 171{ 172 struct pci_link *pci_link; 173 174 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 175 if (pci_link->pl_id == link_id) 176 return (pci_link); 177 } 178 return (NULL); 179} 180 181/* 182 * Find the link device associated with a PCI device in the table. 183 */ 184static void 185pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin, 186 void *arg) 187{ 188 struct pci_link_lookup *lookup; 189 190 lookup = (struct pci_link_lookup *)arg; 191 if (entry->pe_bus == lookup->bus && 192 entry->pe_device == lookup->device && 193 intpin - entry->pe_intpin == lookup->pin) 194 *lookup->pci_link_ptr = pci_pir_find_link(intpin->link); 195} 196 197/* 198 * Check to see if a possible IRQ setting is valid. 199 */ 200static int 201pci_pir_valid_irq(struct pci_link *pci_link, int irq) 202{ 203 204 if (!PCI_INTERRUPT_VALID(irq)) 205 return (0); 206 return (pci_link->pl_irqmask & (1 << irq)); 207} 208 209/* 210 * Walk the $PIR executing the worker function for each valid intpin entry 211 * in the table. The handler is passed a pointer to both the entry and 212 * the intpin in the entry. 213 */ 214static void 215pci_pir_walk_table(pir_entry_handler *handler, void *arg) 216{ 217 struct PIR_entry *entry; 218 struct PIR_intpin *intpin; 219 int i, pin; 220 221 entry = &pci_route_table->pt_entry[0]; 222 for (i = 0; i < pci_route_count; i++, entry++) { 223 intpin = &entry->pe_intpin[0]; 224 for (pin = 0; pin < 4; pin++, intpin++) 225 if (intpin->link != 0) 226 handler(entry, intpin, arg); 227 } 228} 229 230static void 231pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin, 232 void *arg) 233{ 234 struct pci_link *pci_link; 235 236 pci_link = pci_pir_find_link(intpin->link); 237 if (pci_link != NULL) { 238 pci_link->pl_references++; 239 if (intpin->irqs != pci_link->pl_irqmask) { 240 if (bootverbose) 241 printf( 242 "$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n", 243 entry->pe_bus, entry->pe_device, 244 (intpin - entry->pe_intpin) + 'A', 245 pci_link->pl_id); 246 pci_link->pl_irqmask &= intpin->irqs; 247 } 248 } else { 249 pci_link = malloc(sizeof(struct pci_link), M_PIR, M_WAITOK); 250 pci_link->pl_id = intpin->link; 251 pci_link->pl_irqmask = intpin->irqs; 252 pci_link->pl_irq = PCI_INVALID_IRQ; 253 pci_link->pl_references = 1; 254 pci_link->pl_routed = 0; 255 TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links); 256 } 257} 258 259/* 260 * Look to see if any of the functions on the PCI device at bus/device 261 * have an interrupt routed to intpin 'pin' by the BIOS. 262 */ 263static uint8_t 264pci_pir_search_irq(int bus, int device, int pin) 265{ 266 uint32_t value; 267 uint8_t func, maxfunc; 268 269 /* See if we have a valid device at function 0. */ 270 value = pci_cfgregread(bus, device, 0, PCIR_VENDOR, 2); 271 if (value == PCIV_INVALID) 272 return (PCI_INVALID_IRQ); 273 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 274 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 275 return (PCI_INVALID_IRQ); 276 if (value & PCIM_MFDEV) 277 maxfunc = PCI_FUNCMAX; 278 else 279 maxfunc = 0; 280 281 /* Scan all possible functions at this device. */ 282 for (func = 0; func <= maxfunc; func++) { 283 value = pci_cfgregread(bus, device, func, PCIR_VENDOR, 2); 284 if (value == PCIV_INVALID) 285 continue; 286 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 287 288 /* 289 * See if it uses the pin in question. Note that the passed 290 * in pin uses 0 for A, .. 3 for D whereas the intpin 291 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 292 */ 293 if (value != pin + 1) 294 continue; 295 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 296 if (bootverbose) 297 printf( 298 "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n", 299 bus, device, pin + 'A', func, value); 300 if (value != PCI_INVALID_IRQ) 301 return (value); 302 } 303 return (PCI_INVALID_IRQ); 304} 305 306/* 307 * Try to initialize IRQ based on this device's IRQ. 308 */ 309static void 310pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin, 311 void *arg) 312{ 313 struct pci_link *pci_link; 314 uint8_t irq, pin; 315 316 pin = intpin - entry->pe_intpin; 317 pci_link = pci_pir_find_link(intpin->link); 318 irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin); 319 if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq) 320 return; 321 322 /* Don't trust any BIOS IRQs greater than 15. */ 323 if (irq >= NUM_ISA_INTERRUPTS) { 324 printf( 325 "$PIR: Ignoring invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", 326 irq, entry->pe_bus, entry->pe_device, pin + 'A', 327 pci_link->pl_id); 328 return; 329 } 330 331 /* 332 * If we don't have an IRQ for this link yet, then we trust the 333 * BIOS, even if it seems invalid from the $PIR entries. 334 */ 335 if (pci_link->pl_irq == PCI_INVALID_IRQ) { 336 if (!pci_pir_valid_irq(pci_link, irq)) 337 printf( 338 "$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", 339 irq, entry->pe_bus, entry->pe_device, pin + 'A', 340 pci_link->pl_id); 341 pci_link->pl_irq = irq; 342 pci_link->pl_routed = 1; 343 return; 344 } 345 346 /* 347 * We have an IRQ and it doesn't match the current IRQ for this 348 * link. If the new IRQ is invalid, then warn about it and ignore 349 * it. If the old IRQ is invalid and the new IRQ is valid, then 350 * prefer the new IRQ instead. If both IRQs are valid, then just 351 * use the first one. Note that if we ever get into this situation 352 * we are having to guess which setting the BIOS actually routed. 353 * Perhaps we should just give up instead. 354 */ 355 if (!pci_pir_valid_irq(pci_link, irq)) { 356 printf( 357 "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n", 358 irq, entry->pe_bus, entry->pe_device, pin + 'A', 359 pci_link->pl_id); 360 } else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) { 361 printf( 362"$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n", 363 irq, entry->pe_bus, entry->pe_device, pin + 'A', 364 pci_link->pl_id, pci_link->pl_irq); 365 pci_link->pl_irq = irq; 366 pci_link->pl_routed = 1; 367 } else 368 printf( 369 "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n", 370 irq, entry->pe_bus, entry->pe_device, pin + 'A', 371 pci_link->pl_id, pci_link->pl_irq); 372} 373 374/* 375 * Parse $PIR to enumerate link devices and attempt to determine their 376 * initial state. This could perhaps be cleaner if we had drivers for the 377 * various interrupt routers as they could read the initial IRQ for each 378 * link. 379 */ 380static void 381pci_pir_parse(void) 382{ 383 char tunable_buffer[64]; 384 struct pci_link *pci_link; 385 int i, irq; 386 387 /* Only parse once. */ 388 if (pir_parsed) 389 return; 390 pir_parsed = 1; 391 392 /* Enumerate link devices. */ 393 TAILQ_INIT(&pci_links); 394 pci_pir_walk_table(pci_pir_create_links, NULL); 395 if (bootverbose) { 396 printf("$PIR: Links after initial probe:\n"); 397 pci_pir_dump_links(); 398 } 399 400 /* 401 * Check to see if the BIOS has already routed any of the links by 402 * checking each device connected to each link to see if it has a 403 * valid IRQ. 404 */ 405 pci_pir_walk_table(pci_pir_initial_irqs, NULL); 406 if (bootverbose) { 407 printf("$PIR: Links after initial IRQ discovery:\n"); 408 pci_pir_dump_links(); 409 } 410 411 /* 412 * Allow the user to override the IRQ for a given link device. We 413 * allow invalid IRQs to be specified but warn about them. An IRQ 414 * of 255 or 0 clears any preset IRQ. 415 */ 416 i = 0; 417 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 418 snprintf(tunable_buffer, sizeof(tunable_buffer), 419 "hw.pci.link.%#x.irq", pci_link->pl_id); 420 if (getenv_int(tunable_buffer, &irq) == 0) 421 continue; 422 if (irq == 0) 423 irq = PCI_INVALID_IRQ; 424 if (irq != PCI_INVALID_IRQ && 425 !pci_pir_valid_irq(pci_link, irq) && bootverbose) 426 printf( 427 "$PIR: Warning, IRQ %d for link %#x is not listed as valid\n", 428 irq, pci_link->pl_id); 429 pci_link->pl_routed = 0; 430 pci_link->pl_irq = irq; 431 i = 1; 432 } 433 if (bootverbose && i) { 434 printf("$PIR: Links after tunable overrides:\n"); 435 pci_pir_dump_links(); 436 } 437 438 /* 439 * Build initial interrupt weights as well as bitmap of "known-good" 440 * IRQs that the BIOS has already used for PCI link devices. 441 */ 442 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 443 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) 444 continue; 445 pir_bios_irqs |= 1 << pci_link->pl_irq; 446 pir_interrupt_weight[pci_link->pl_irq] += 447 pci_link->pl_references; 448 } 449 if (bootverbose) { 450 printf("$PIR: IRQs used by BIOS: "); 451 pci_print_irqmask(pir_bios_irqs); 452 printf("\n"); 453 printf("$PIR: Interrupt Weights:\n[ "); 454 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 455 printf(" %3d", i); 456 printf(" ]\n[ "); 457 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) 458 printf(" %3d", pir_interrupt_weight[i]); 459 printf(" ]\n"); 460 } 461} 462 463/* 464 * Use the PCI BIOS to route an interrupt for a given device. 465 * 466 * Input: 467 * AX = PCIBIOS_ROUTE_INTERRUPT 468 * BH = bus 469 * BL = device [7:3] / function [2:0] 470 * CH = IRQ 471 * CL = Interrupt Pin (0x0A = A, ... 0x0D = D) 472 */ 473static int 474pci_pir_biosroute(int bus, int device, int func, int pin, int irq) 475{ 476 struct bios_regs args; 477 478 args.eax = PCIBIOS_ROUTE_INTERRUPT; 479 args.ebx = (bus << 8) | (device << 3) | func; 480 args.ecx = (irq << 8) | (0xa + pin); 481 return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))); 482} 483 484/* 485 * Route a PCI interrupt using a link device from the $PIR. 486 */ 487int 488pci_pir_route_interrupt(int bus, int device, int func, int pin) 489{ 490 struct pci_link_lookup lookup; 491 struct pci_link *pci_link; 492 int error, irq; 493 494 if (pci_route_table == NULL) 495 return (PCI_INVALID_IRQ); 496 497 /* Lookup link device for this PCI device/pin. */ 498 pci_link = NULL; 499 lookup.bus = bus; 500 lookup.device = device; 501 lookup.pin = pin - 1; 502 lookup.pci_link_ptr = &pci_link; 503 pci_pir_walk_table(pci_pir_find_link_handler, &lookup); 504 if (pci_link == NULL) { 505 printf("$PIR: No matching entry for %d.%d.INT%c\n", bus, 506 device, pin - 1 + 'A'); 507 return (PCI_INVALID_IRQ); 508 } 509 510 /* 511 * Pick a new interrupt if we don't have one already. We look 512 * for an interrupt from several different sets. First, if 513 * this link only has one valid IRQ, use that. Second, we 514 * check the set of PCI only interrupts from the $PIR. Third, 515 * we check the set of known-good interrupts that the BIOS has 516 * already used. Lastly, we check the "all possible valid 517 * IRQs" set. 518 */ 519 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 520 if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask)) 521 irq = ffs(pci_link->pl_irqmask) - 1; 522 else 523 irq = pci_pir_choose_irq(pci_link, 524 pci_route_table->pt_header.ph_pci_irqs); 525 if (!PCI_INTERRUPT_VALID(irq)) 526 irq = pci_pir_choose_irq(pci_link, pir_bios_irqs); 527 if (!PCI_INTERRUPT_VALID(irq)) 528 irq = pci_pir_choose_irq(pci_link, 529 pci_irq_override_mask); 530 if (!PCI_INTERRUPT_VALID(irq)) { 531 if (bootverbose) 532 printf( 533 "$PIR: Failed to route interrupt for %d:%d INT%c\n", 534 bus, device, pin - 1 + 'A'); 535 return (PCI_INVALID_IRQ); 536 } 537 pci_link->pl_irq = irq; 538 } 539 540 /* Ask the BIOS to route this IRQ if we haven't done so already. */ 541 if (!pci_link->pl_routed) { 542 error = pci_pir_biosroute(bus, device, func, pin - 1, 543 pci_link->pl_irq); 544 545 /* Ignore errors when routing a unique interrupt. */ 546 if (error && !powerof2(pci_link->pl_irqmask)) { 547 printf("$PIR: ROUTE_INTERRUPT failed.\n"); 548 return (PCI_INVALID_IRQ); 549 } 550 pci_link->pl_routed = 1; 551 552 /* Ensure the interrupt is set to level/low trigger. */ 553 KASSERT(pir_device != NULL, ("missing pir device")); 554 BUS_CONFIG_INTR(pir_device, pci_link->pl_irq, 555 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); 556 } 557 if (bootverbose) 558 printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device, 559 pin - 1 + 'A', pci_link->pl_irq); 560 return (pci_link->pl_irq); 561} 562 563/* 564 * Try to pick an interrupt for the specified link from the interrupts 565 * set in the mask. 566 */ 567static int 568pci_pir_choose_irq(struct pci_link *pci_link, int irqmask) 569{ 570 int i, irq, realmask; 571 572 /* XXX: Need to have a #define of known bad IRQs to also mask out? */ 573 realmask = pci_link->pl_irqmask & irqmask; 574 if (realmask == 0) 575 return (PCI_INVALID_IRQ); 576 577 /* Find IRQ with lowest weight. */ 578 irq = PCI_INVALID_IRQ; 579 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) { 580 if (!(realmask & 1 << i)) 581 continue; 582 if (irq == PCI_INVALID_IRQ || 583 pir_interrupt_weight[i] < pir_interrupt_weight[irq]) 584 irq = i; 585 } 586 if (bootverbose && PCI_INTERRUPT_VALID(irq)) { 587 printf("$PIR: Found IRQ %d for link %#x from ", irq, 588 pci_link->pl_id); 589 pci_print_irqmask(realmask); 590 printf("\n"); 591 } 592 return (irq); 593} 594 595static void 596pci_print_irqmask(u_int16_t irqs) 597{ 598 int i, first; 599 600 if (irqs == 0) { 601 printf("none"); 602 return; 603 } 604 first = 1; 605 for (i = 0; i < 16; i++, irqs >>= 1) 606 if (irqs & 1) { 607 if (!first) 608 printf(" "); 609 else 610 first = 0; 611 printf("%d", i); 612 } 613} 614 615/* 616 * Display link devices. 617 */ 618static void 619pci_pir_dump_links(void) 620{ 621 struct pci_link *pci_link; 622 623 printf("Link IRQ Rtd Ref IRQs\n"); 624 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 625 printf("%#4x %3d %c %3d ", pci_link->pl_id, 626 pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N', 627 pci_link->pl_references); 628 pci_print_irqmask(pci_link->pl_irqmask); 629 printf("\n"); 630 } 631} 632 633/* 634 * See if any interrupts for a given PCI bus are routed in the PIR. Don't 635 * even bother looking if the BIOS doesn't support routing anyways. If we 636 * are probing a PCI-PCI bridge, then require_parse will be true and we should 637 * only succeed if a host-PCI bridge has already attached and parsed the PIR. 638 */ 639int 640pci_pir_probe(int bus, int require_parse) 641{ 642 int i; 643 644 if (pci_route_table == NULL || (require_parse && !pir_parsed)) 645 return (0); 646 for (i = 0; i < pci_route_count; i++) 647 if (pci_route_table->pt_entry[i].pe_bus == bus) 648 return (1); 649 return (0); 650} 651 652/* 653 * The driver for the new-bus pseudo device pir0 for the $PIR table. 654 */ 655 656static int 657pir_probe(device_t dev) 658{ 659 char buf[64]; 660 661 snprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries", 662 pci_route_count); 663 device_set_desc_copy(dev, buf); 664 return (0); 665} 666 667static int 668pir_attach(device_t dev) 669{ 670 671 pci_pir_parse(); 672 KASSERT(pir_device == NULL, ("Multiple pir devices")); 673 pir_device = dev; 674 return (0); 675} 676 677static void 678pir_resume_find_device(struct PIR_entry *entry, struct PIR_intpin *intpin, 679 void *arg) 680{ 681 struct pci_dev_lookup *pd; 682 683 pd = (struct pci_dev_lookup *)arg; 684 if (intpin->link != pd->link || pd->bus != -1) 685 return; 686 pd->bus = entry->pe_bus; 687 pd->device = entry->pe_device; 688 pd->pin = intpin - entry->pe_intpin; 689} 690 691static int 692pir_resume(device_t dev) 693{ 694 struct pci_dev_lookup pd; 695 struct pci_link *pci_link; 696 int error; 697 698 /* Ask the BIOS to re-route each link that was already routed. */ 699 TAILQ_FOREACH(pci_link, &pci_links, pl_links) { 700 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { 701 KASSERT(!pci_link->pl_routed, 702 ("link %#x is routed but has invalid PCI IRQ", 703 pci_link->pl_id)); 704 continue; 705 } 706 if (pci_link->pl_routed) { 707 pd.bus = -1; 708 pd.link = pci_link->pl_id; 709 pci_pir_walk_table(pir_resume_find_device, &pd); 710 KASSERT(pd.bus != -1, 711 ("did not find matching entry for link %#x in the $PIR table", 712 pci_link->pl_id)); 713 if (bootverbose) 714 device_printf(dev, 715 "Using %d.%d.INT%c to route link %#x to IRQ %d\n", 716 pd.bus, pd.device, pd.pin + 'A', 717 pci_link->pl_id, pci_link->pl_irq); 718 error = pci_pir_biosroute(pd.bus, pd.device, 0, pd.pin, 719 pci_link->pl_irq); 720 if (error) 721 device_printf(dev, 722 "ROUTE_INTERRUPT on resume for link %#x failed.\n", 723 pci_link->pl_id); 724 } 725 } 726 return (0); 727} 728 729static device_method_t pir_methods[] = { 730 /* Device interface */ 731 DEVMETHOD(device_probe, pir_probe), 732 DEVMETHOD(device_attach, pir_attach), 733 DEVMETHOD(device_resume, pir_resume), 734 { 0, 0 } 735}; 736 737static driver_t pir_driver = { 738 "pir", 739 pir_methods, 740 1, 741}; 742 743static devclass_t pir_devclass; 744 745DRIVER_MODULE(pir, legacy, pir_driver, pir_devclass, 0, 0); 746