1 /* 2 * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or (at 13 * your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License along 21 * with this program; if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 23 * 24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 25 */ 26 27 28 #include <linux/dmi.h> 29 #include <linux/kernel.h> 30 #include <linux/module.h> 31 #include <linux/init.h> 32 #include <linux/types.h> 33 #include <linux/proc_fs.h> 34 #include <linux/spinlock.h> 35 #include <linux/pm.h> 36 #include <linux/pci.h> 37 #include <linux/acpi.h> 38 #include <acpi/acpi_bus.h> 39 #include <acpi/acpi_drivers.h> 40 41 #define _COMPONENT ACPI_PCI_COMPONENT 42 ACPI_MODULE_NAME("pci_irq"); 43 44 static struct acpi_prt_list acpi_prt; 45 static DEFINE_SPINLOCK(acpi_prt_lock); 46 47 /* -------------------------------------------------------------------------- 48 PCI IRQ Routing Table (PRT) Support 49 -------------------------------------------------------------------------- */ 50 51 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment, 52 int bus, 53 int device, int pin) 54 { 55 struct acpi_prt_entry *entry = NULL; 56 57 if (!acpi_prt.count) 58 return NULL; 59 60 /* 61 * Parse through all PRT entries looking for a match on the specified 62 * PCI device's segment, bus, device, and pin (don't care about func). 63 * 64 */ 65 spin_lock(&acpi_prt_lock); 66 list_for_each_entry(entry, &acpi_prt.entries, node) { 67 if ((segment == entry->id.segment) 68 && (bus == entry->id.bus) 69 && (device == entry->id.device) 70 && (pin == entry->pin)) { 71 spin_unlock(&acpi_prt_lock); 72 return entry; 73 } 74 } 75 76 spin_unlock(&acpi_prt_lock); 77 return NULL; 78 } 79 80 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */ 81 static struct dmi_system_id medion_md9580[] = { 82 { 83 .ident = "Medion MD9580-F laptop", 84 .matches = { 85 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"), 86 DMI_MATCH(DMI_PRODUCT_NAME, "A555"), 87 }, 88 }, 89 { } 90 }; 91 92 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */ 93 static struct dmi_system_id dell_optiplex[] = { 94 { 95 .ident = "Dell Optiplex GX1", 96 .matches = { 97 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 98 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"), 99 }, 100 }, 101 { } 102 }; 103 104 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */ 105 static struct dmi_system_id hp_t5710[] = { 106 { 107 .ident = "HP t5710", 108 .matches = { 109 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 110 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"), 111 DMI_MATCH(DMI_BOARD_NAME, "098Ch"), 112 }, 113 }, 114 { } 115 }; 116 117 struct prt_quirk { 118 struct dmi_system_id *system; 119 unsigned int segment; 120 unsigned int bus; 121 unsigned int device; 122 unsigned char pin; 123 char *source; /* according to BIOS */ 124 char *actual_source; 125 }; 126 127 /* 128 * These systems have incorrect _PRT entries. The BIOS claims the PCI 129 * interrupt at the listed segment/bus/device/pin is connected to the first 130 * link device, but it is actually connected to the second. 131 */ 132 static struct prt_quirk prt_quirks[] = { 133 { medion_md9580, 0, 0, 9, 'A', 134 "\\_SB_.PCI0.ISA_.LNKA", 135 "\\_SB_.PCI0.ISA_.LNKB"}, 136 { dell_optiplex, 0, 0, 0xd, 'A', 137 "\\_SB_.LNKB", 138 "\\_SB_.LNKA"}, 139 { hp_t5710, 0, 0, 1, 'A', 140 "\\_SB_.PCI0.LNK1", 141 "\\_SB_.PCI0.LNK3"}, 142 }; 143 144 static void 145 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt) 146 { 147 int i; 148 struct prt_quirk *quirk; 149 150 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) { 151 quirk = &prt_quirks[i]; 152 153 /* All current quirks involve link devices, not GSIs */ 154 if (!prt->source) 155 continue; 156 157 if (dmi_check_system(quirk->system) && 158 entry->id.segment == quirk->segment && 159 entry->id.bus == quirk->bus && 160 entry->id.device == quirk->device && 161 entry->pin + 'A' == quirk->pin && 162 !strcmp(prt->source, quirk->source) && 163 strlen(prt->source) >= strlen(quirk->actual_source)) { 164 printk(KERN_WARNING PREFIX "firmware reports " 165 "%04x:%02x:%02x PCI INT %c connected to %s; " 166 "changing to %s\n", 167 entry->id.segment, entry->id.bus, 168 entry->id.device, 'A' + entry->pin, 169 prt->source, quirk->actual_source); 170 strcpy(prt->source, quirk->actual_source); 171 } 172 } 173 } 174 175 static int 176 acpi_pci_irq_add_entry(acpi_handle handle, 177 int segment, int bus, struct acpi_pci_routing_table *prt) 178 { 179 struct acpi_prt_entry *entry = NULL; 180 181 182 if (!prt) 183 return -EINVAL; 184 185 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); 186 if (!entry) 187 return -ENOMEM; 188 189 entry->id.segment = segment; 190 entry->id.bus = bus; 191 entry->id.device = (prt->address >> 16) & 0xFFFF; 192 entry->id.function = prt->address & 0xFFFF; 193 entry->pin = prt->pin; 194 195 do_prt_fixups(entry, prt); 196 197 /* 198 * Type 1: Dynamic 199 * --------------- 200 * The 'source' field specifies the PCI interrupt link device used to 201 * configure the IRQ assigned to this slot|dev|pin. The 'source_index' 202 * indicates which resource descriptor in the resource template (of 203 * the link device) this interrupt is allocated from. 204 * 205 * NOTE: Don't query the Link Device for IRQ information at this time 206 * because Link Device enumeration may not have occurred yet 207 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI 208 * namespace). 209 */ 210 if (prt->source[0]) { 211 acpi_get_handle(handle, prt->source, &entry->link.handle); 212 entry->link.index = prt->source_index; 213 } 214 /* 215 * Type 2: Static 216 * -------------- 217 * The 'source' field is NULL, and the 'source_index' field specifies 218 * the IRQ value, which is hardwired to specific interrupt inputs on 219 * the interrupt controller. 220 */ 221 else 222 entry->link.index = prt->source_index; 223 224 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, 225 " %02X:%02X:%02X[%c] -> %s[%d]\n", 226 entry->id.segment, entry->id.bus, 227 entry->id.device, ('A' + entry->pin), prt->source, 228 entry->link.index)); 229 230 spin_lock(&acpi_prt_lock); 231 list_add_tail(&entry->node, &acpi_prt.entries); 232 acpi_prt.count++; 233 spin_unlock(&acpi_prt_lock); 234 235 return 0; 236 } 237 238 static void 239 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry) 240 { 241 if (segment == entry->id.segment && bus == entry->id.bus) { 242 acpi_prt.count--; 243 list_del(&entry->node); 244 kfree(entry); 245 } 246 } 247 248 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus) 249 { 250 acpi_status status = AE_OK; 251 char *pathname = NULL; 252 struct acpi_buffer buffer = { 0, NULL }; 253 struct acpi_pci_routing_table *prt = NULL; 254 struct acpi_pci_routing_table *entry = NULL; 255 static int first_time = 1; 256 257 258 pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL); 259 if (!pathname) 260 return -ENOMEM; 261 262 if (first_time) { 263 acpi_prt.count = 0; 264 INIT_LIST_HEAD(&acpi_prt.entries); 265 first_time = 0; 266 } 267 268 /* 269 * NOTE: We're given a 'handle' to the _PRT object's parent device 270 * (either a PCI root bridge or PCI-PCI bridge). 271 */ 272 273 buffer.length = ACPI_PATHNAME_MAX; 274 buffer.pointer = pathname; 275 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 276 277 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", 278 pathname); 279 280 /* 281 * Evaluate this _PRT and add its entries to our global list (acpi_prt). 282 */ 283 284 buffer.length = 0; 285 buffer.pointer = NULL; 286 kfree(pathname); 287 status = acpi_get_irq_routing_table(handle, &buffer); 288 if (status != AE_BUFFER_OVERFLOW) { 289 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", 290 acpi_format_exception(status))); 291 return -ENODEV; 292 } 293 294 prt = kzalloc(buffer.length, GFP_KERNEL); 295 if (!prt) { 296 return -ENOMEM; 297 } 298 buffer.pointer = prt; 299 300 status = acpi_get_irq_routing_table(handle, &buffer); 301 if (ACPI_FAILURE(status)) { 302 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", 303 acpi_format_exception(status))); 304 kfree(buffer.pointer); 305 return -ENODEV; 306 } 307 308 entry = prt; 309 310 while (entry && (entry->length > 0)) { 311 acpi_pci_irq_add_entry(handle, segment, bus, entry); 312 entry = (struct acpi_pci_routing_table *) 313 ((unsigned long)entry + entry->length); 314 } 315 316 kfree(prt); 317 318 return 0; 319 } 320 321 void acpi_pci_irq_del_prt(int segment, int bus) 322 { 323 struct list_head *node = NULL, *n = NULL; 324 struct acpi_prt_entry *entry = NULL; 325 326 if (!acpi_prt.count) { 327 return; 328 } 329 330 printk(KERN_DEBUG 331 "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment, 332 bus); 333 spin_lock(&acpi_prt_lock); 334 list_for_each_safe(node, n, &acpi_prt.entries) { 335 entry = list_entry(node, struct acpi_prt_entry, node); 336 337 acpi_pci_irq_del_entry(segment, bus, entry); 338 } 339 spin_unlock(&acpi_prt_lock); 340 } 341 342 /* -------------------------------------------------------------------------- 343 PCI Interrupt Routing Support 344 -------------------------------------------------------------------------- */ 345 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **); 346 347 static int 348 acpi_pci_allocate_irq(struct acpi_prt_entry *entry, 349 int *triggering, int *polarity, char **link) 350 { 351 int irq; 352 353 354 if (entry->link.handle) { 355 irq = acpi_pci_link_allocate_irq(entry->link.handle, 356 entry->link.index, triggering, 357 polarity, link); 358 if (irq < 0) { 359 printk(KERN_WARNING PREFIX 360 "Invalid IRQ link routing entry\n"); 361 return -1; 362 } 363 } else { 364 irq = entry->link.index; 365 *triggering = ACPI_LEVEL_SENSITIVE; 366 *polarity = ACPI_ACTIVE_LOW; 367 } 368 369 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq)); 370 return irq; 371 } 372 373 static int 374 acpi_pci_free_irq(struct acpi_prt_entry *entry, 375 int *triggering, int *polarity, char **link) 376 { 377 int irq; 378 379 if (entry->link.handle) { 380 irq = acpi_pci_link_free_irq(entry->link.handle); 381 } else { 382 irq = entry->link.index; 383 } 384 return irq; 385 } 386 387 /* 388 * acpi_pci_irq_lookup 389 * success: return IRQ >= 0 390 * failure: return -1 391 */ 392 static int 393 acpi_pci_irq_lookup(struct pci_bus *bus, 394 int device, 395 int pin, 396 int *triggering, 397 int *polarity, char **link, irq_lookup_func func) 398 { 399 struct acpi_prt_entry *entry = NULL; 400 int segment = pci_domain_nr(bus); 401 int bus_nr = bus->number; 402 int ret; 403 404 405 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 406 "Searching for PRT entry for %02x:%02x:%02x[%c]\n", 407 segment, bus_nr, device, ('A' + pin))); 408 409 entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); 410 if (!entry) { 411 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n")); 412 return -1; 413 } 414 415 ret = func(entry, triggering, polarity, link); 416 return ret; 417 } 418 419 /* 420 * acpi_pci_irq_derive 421 * success: return IRQ >= 0 422 * failure: return < 0 423 */ 424 static int 425 acpi_pci_irq_derive(struct pci_dev *dev, 426 int pin, 427 int *triggering, 428 int *polarity, char **link, irq_lookup_func func) 429 { 430 struct pci_dev *bridge = dev; 431 int irq = -1; 432 u8 bridge_pin = 0, orig_pin = pin; 433 434 435 if (!dev) 436 return -EINVAL; 437 438 /* 439 * Attempt to derive an IRQ for this device from a parent bridge's 440 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). 441 */ 442 while (irq < 0 && bridge->bus->self) { 443 pin = (pin + PCI_SLOT(bridge->devfn)) % 4; 444 bridge = bridge->bus->self; 445 446 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { 447 /* PC card has the same IRQ as its cardbridge */ 448 bridge_pin = bridge->pin; 449 if (!bridge_pin) { 450 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 451 "No interrupt pin configured for device %s\n", 452 pci_name(bridge))); 453 return -1; 454 } 455 /* Pin is from 0 to 3 */ 456 bridge_pin--; 457 pin = bridge_pin; 458 } 459 460 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), 461 pin, triggering, polarity, 462 link, func); 463 } 464 465 if (irq < 0) { 466 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n", 467 'A' + orig_pin); 468 return -1; 469 } 470 471 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n", 472 irq, pci_name(dev), pci_name(bridge))); 473 474 return irq; 475 } 476 477 /* 478 * acpi_pci_irq_enable 479 * success: return 0 480 * failure: return < 0 481 */ 482 483 int acpi_pci_irq_enable(struct pci_dev *dev) 484 { 485 int irq = 0; 486 u8 pin = 0; 487 int triggering = ACPI_LEVEL_SENSITIVE; 488 int polarity = ACPI_ACTIVE_LOW; 489 char *link = NULL; 490 char link_desc[16]; 491 int rc; 492 493 494 if (!dev) 495 return -EINVAL; 496 497 pin = dev->pin; 498 if (!pin) { 499 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 500 "No interrupt pin configured for device %s\n", 501 pci_name(dev))); 502 return 0; 503 } 504 pin--; 505 506 if (!dev->bus) { 507 dev_err(&dev->dev, "invalid (NULL) 'bus' field\n"); 508 return -ENODEV; 509 } 510 511 /* 512 * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT 513 * values override any BIOS-assigned IRQs set during boot. 514 */ 515 irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, 516 &triggering, &polarity, &link, 517 acpi_pci_allocate_irq); 518 519 /* 520 * If no PRT entry was found, we'll try to derive an IRQ from the 521 * device's parent bridge. 522 */ 523 if (irq < 0) 524 irq = acpi_pci_irq_derive(dev, pin, &triggering, 525 &polarity, &link, 526 acpi_pci_allocate_irq); 527 528 if (irq < 0) { 529 /* 530 * IDE legacy mode controller IRQs are magic. Why do compat 531 * extensions always make such a nasty mess. 532 */ 533 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && 534 (dev->class & 0x05) == 0) 535 return 0; 536 } 537 /* 538 * No IRQ known to the ACPI subsystem - maybe the BIOS / 539 * driver reported one, then use it. Exit in any case. 540 */ 541 if (irq < 0) { 542 dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin); 543 /* Interrupt Line values above 0xF are forbidden */ 544 if (dev->irq > 0 && (dev->irq <= 0xF)) { 545 printk(" - using IRQ %d\n", dev->irq); 546 acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, 547 ACPI_ACTIVE_LOW); 548 return 0; 549 } else { 550 printk("\n"); 551 return 0; 552 } 553 } 554 555 rc = acpi_register_gsi(irq, triggering, polarity); 556 if (rc < 0) { 557 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n", 558 'A' + pin); 559 return rc; 560 } 561 dev->irq = rc; 562 563 if (link) 564 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); 565 else 566 link_desc[0] = '\0'; 567 568 dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n", 569 'A' + pin, link_desc, irq, 570 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", 571 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); 572 573 return 0; 574 } 575 576 /* FIXME: implement x86/x86_64 version */ 577 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i) 578 { 579 } 580 581 void acpi_pci_irq_disable(struct pci_dev *dev) 582 { 583 int gsi = 0; 584 u8 pin = 0; 585 int triggering = ACPI_LEVEL_SENSITIVE; 586 int polarity = ACPI_ACTIVE_LOW; 587 588 589 if (!dev || !dev->bus) 590 return; 591 592 pin = dev->pin; 593 if (!pin) 594 return; 595 pin--; 596 597 /* 598 * First we check the PCI IRQ routing table (PRT) for an IRQ. 599 */ 600 gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, 601 &triggering, &polarity, NULL, 602 acpi_pci_free_irq); 603 /* 604 * If no PRT entry was found, we'll try to derive an IRQ from the 605 * device's parent bridge. 606 */ 607 if (gsi < 0) 608 gsi = acpi_pci_irq_derive(dev, pin, 609 &triggering, &polarity, NULL, 610 acpi_pci_free_irq); 611 if (gsi < 0) 612 return; 613 614 /* 615 * TBD: It might be worth clearing dev->irq by magic constant 616 * (e.g. PCI_UNDEFINED_IRQ). 617 */ 618 619 dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin); 620 acpi_unregister_gsi(gsi); 621 } 622