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 * (c) Copyright 2008 Hewlett-Packard Development Company, L.P. 8 * Bjorn Helgaas <bjorn.helgaas@hp.com> 9 * 10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or (at 15 * your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License along 23 * with this program; if not, write to the Free Software Foundation, Inc., 24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 25 * 26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 27 */ 28 29 30 #include <linux/dmi.h> 31 #include <linux/kernel.h> 32 #include <linux/module.h> 33 #include <linux/init.h> 34 #include <linux/types.h> 35 #include <linux/spinlock.h> 36 #include <linux/pm.h> 37 #include <linux/pci.h> 38 #include <linux/acpi.h> 39 #include <linux/slab.h> 40 #include <acpi/acpi_bus.h> 41 #include <acpi/acpi_drivers.h> 42 43 #define PREFIX "ACPI: " 44 45 #define _COMPONENT ACPI_PCI_COMPONENT 46 ACPI_MODULE_NAME("pci_irq"); 47 48 struct acpi_prt_entry { 49 struct list_head list; 50 struct acpi_pci_id id; 51 u8 pin; 52 acpi_handle link; 53 u32 index; /* GSI, or link _CRS index */ 54 }; 55 56 static LIST_HEAD(acpi_prt_list); 57 static DEFINE_SPINLOCK(acpi_prt_lock); 58 59 static inline char pin_name(int pin) 60 { 61 return 'A' + pin - 1; 62 } 63 64 /* -------------------------------------------------------------------------- 65 PCI IRQ Routing Table (PRT) Support 66 -------------------------------------------------------------------------- */ 67 68 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev, 69 int pin) 70 { 71 struct acpi_prt_entry *entry; 72 int segment = pci_domain_nr(dev->bus); 73 int bus = dev->bus->number; 74 int device = PCI_SLOT(dev->devfn); 75 76 spin_lock(&acpi_prt_lock); 77 list_for_each_entry(entry, &acpi_prt_list, list) { 78 if ((segment == entry->id.segment) 79 && (bus == entry->id.bus) 80 && (device == entry->id.device) 81 && (pin == entry->pin)) { 82 spin_unlock(&acpi_prt_lock); 83 return entry; 84 } 85 } 86 spin_unlock(&acpi_prt_lock); 87 return NULL; 88 } 89 90 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */ 91 static const struct dmi_system_id medion_md9580[] = { 92 { 93 .ident = "Medion MD9580-F laptop", 94 .matches = { 95 DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"), 96 DMI_MATCH(DMI_PRODUCT_NAME, "A555"), 97 }, 98 }, 99 { } 100 }; 101 102 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */ 103 static const struct dmi_system_id dell_optiplex[] = { 104 { 105 .ident = "Dell Optiplex GX1", 106 .matches = { 107 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 108 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"), 109 }, 110 }, 111 { } 112 }; 113 114 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */ 115 static const struct dmi_system_id hp_t5710[] = { 116 { 117 .ident = "HP t5710", 118 .matches = { 119 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 120 DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"), 121 DMI_MATCH(DMI_BOARD_NAME, "098Ch"), 122 }, 123 }, 124 { } 125 }; 126 127 struct prt_quirk { 128 const struct dmi_system_id *system; 129 unsigned int segment; 130 unsigned int bus; 131 unsigned int device; 132 unsigned char pin; 133 const char *source; /* according to BIOS */ 134 const char *actual_source; 135 }; 136 137 #define PCI_INTX_PIN(c) (c - 'A' + 1) 138 139 /* 140 * These systems have incorrect _PRT entries. The BIOS claims the PCI 141 * interrupt at the listed segment/bus/device/pin is connected to the first 142 * link device, but it is actually connected to the second. 143 */ 144 static const struct prt_quirk prt_quirks[] = { 145 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'), 146 "\\_SB_.PCI0.ISA_.LNKA", 147 "\\_SB_.PCI0.ISA_.LNKB"}, 148 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'), 149 "\\_SB_.LNKB", 150 "\\_SB_.LNKA"}, 151 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'), 152 "\\_SB_.PCI0.LNK1", 153 "\\_SB_.PCI0.LNK3"}, 154 }; 155 156 static void do_prt_fixups(struct acpi_prt_entry *entry, 157 struct acpi_pci_routing_table *prt) 158 { 159 int i; 160 const struct prt_quirk *quirk; 161 162 for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) { 163 quirk = &prt_quirks[i]; 164 165 /* All current quirks involve link devices, not GSIs */ 166 if (!prt->source) 167 continue; 168 169 if (dmi_check_system(quirk->system) && 170 entry->id.segment == quirk->segment && 171 entry->id.bus == quirk->bus && 172 entry->id.device == quirk->device && 173 entry->pin == quirk->pin && 174 !strcmp(prt->source, quirk->source) && 175 strlen(prt->source) >= strlen(quirk->actual_source)) { 176 printk(KERN_WARNING PREFIX "firmware reports " 177 "%04x:%02x:%02x PCI INT %c connected to %s; " 178 "changing to %s\n", 179 entry->id.segment, entry->id.bus, 180 entry->id.device, pin_name(entry->pin), 181 prt->source, quirk->actual_source); 182 strcpy(prt->source, quirk->actual_source); 183 } 184 } 185 } 186 187 static int acpi_pci_irq_add_entry(acpi_handle handle, struct pci_bus *bus, 188 struct acpi_pci_routing_table *prt) 189 { 190 struct acpi_prt_entry *entry; 191 192 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); 193 if (!entry) 194 return -ENOMEM; 195 196 /* 197 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses 198 * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert 199 * it here. 200 */ 201 entry->id.segment = pci_domain_nr(bus); 202 entry->id.bus = bus->number; 203 entry->id.device = (prt->address >> 16) & 0xFFFF; 204 entry->pin = prt->pin + 1; 205 206 do_prt_fixups(entry, prt); 207 208 entry->index = prt->source_index; 209 210 /* 211 * Type 1: Dynamic 212 * --------------- 213 * The 'source' field specifies the PCI interrupt link device used to 214 * configure the IRQ assigned to this slot|dev|pin. The 'source_index' 215 * indicates which resource descriptor in the resource template (of 216 * the link device) this interrupt is allocated from. 217 * 218 * NOTE: Don't query the Link Device for IRQ information at this time 219 * because Link Device enumeration may not have occurred yet 220 * (e.g. exists somewhere 'below' this _PRT entry in the ACPI 221 * namespace). 222 */ 223 if (prt->source[0]) 224 acpi_get_handle(handle, prt->source, &entry->link); 225 226 /* 227 * Type 2: Static 228 * -------------- 229 * The 'source' field is NULL, and the 'source_index' field specifies 230 * the IRQ value, which is hardwired to specific interrupt inputs on 231 * the interrupt controller. 232 */ 233 234 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, 235 " %04x:%02x:%02x[%c] -> %s[%d]\n", 236 entry->id.segment, entry->id.bus, 237 entry->id.device, pin_name(entry->pin), 238 prt->source, entry->index)); 239 240 spin_lock(&acpi_prt_lock); 241 list_add_tail(&entry->list, &acpi_prt_list); 242 spin_unlock(&acpi_prt_lock); 243 244 return 0; 245 } 246 247 int acpi_pci_irq_add_prt(acpi_handle handle, struct pci_bus *bus) 248 { 249 acpi_status status; 250 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 251 struct acpi_pci_routing_table *entry; 252 253 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */ 254 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 255 if (ACPI_FAILURE(status)) 256 return -ENODEV; 257 258 printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", 259 (char *) buffer.pointer); 260 261 kfree(buffer.pointer); 262 263 buffer.length = ACPI_ALLOCATE_BUFFER; 264 buffer.pointer = NULL; 265 266 status = acpi_get_irq_routing_table(handle, &buffer); 267 if (ACPI_FAILURE(status)) { 268 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", 269 acpi_format_exception(status))); 270 kfree(buffer.pointer); 271 return -ENODEV; 272 } 273 274 entry = buffer.pointer; 275 while (entry && (entry->length > 0)) { 276 acpi_pci_irq_add_entry(handle, bus, entry); 277 entry = (struct acpi_pci_routing_table *) 278 ((unsigned long)entry + entry->length); 279 } 280 281 kfree(buffer.pointer); 282 return 0; 283 } 284 285 void acpi_pci_irq_del_prt(struct pci_bus *bus) 286 { 287 struct acpi_prt_entry *entry, *tmp; 288 289 printk(KERN_DEBUG 290 "ACPI: Delete PCI Interrupt Routing Table for %04x:%02x\n", 291 pci_domain_nr(bus), bus->number); 292 spin_lock(&acpi_prt_lock); 293 list_for_each_entry_safe(entry, tmp, &acpi_prt_list, list) { 294 if (pci_domain_nr(bus) == entry->id.segment 295 && bus->number == entry->id.bus) { 296 list_del(&entry->list); 297 kfree(entry); 298 } 299 } 300 spin_unlock(&acpi_prt_lock); 301 } 302 303 /* -------------------------------------------------------------------------- 304 PCI Interrupt Routing Support 305 -------------------------------------------------------------------------- */ 306 #ifdef CONFIG_X86_IO_APIC 307 extern int noioapicquirk; 308 extern int noioapicreroute; 309 310 static int bridge_has_boot_interrupt_variant(struct pci_bus *bus) 311 { 312 struct pci_bus *bus_it; 313 314 for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) { 315 if (!bus_it->self) 316 return 0; 317 if (bus_it->self->irq_reroute_variant) 318 return bus_it->self->irq_reroute_variant; 319 } 320 return 0; 321 } 322 323 /* 324 * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ 325 * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does 326 * during interrupt handling). When this INTx generation cannot be disabled, 327 * we reroute these interrupts to their legacy equivalent to get rid of 328 * spurious interrupts. 329 */ 330 static int acpi_reroute_boot_interrupt(struct pci_dev *dev, 331 struct acpi_prt_entry *entry) 332 { 333 if (noioapicquirk || noioapicreroute) { 334 return 0; 335 } else { 336 switch (bridge_has_boot_interrupt_variant(dev->bus)) { 337 case 0: 338 /* no rerouting necessary */ 339 return 0; 340 case INTEL_IRQ_REROUTE_VARIANT: 341 /* 342 * Remap according to INTx routing table in 6700PXH 343 * specs, intel order number 302628-002, section 344 * 2.15.2. Other chipsets (80332, ...) have the same 345 * mapping and are handled here as well. 346 */ 347 dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy " 348 "IRQ %d\n", entry->index, 349 (entry->index % 4) + 16); 350 entry->index = (entry->index % 4) + 16; 351 return 1; 352 default: 353 dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy " 354 "IRQ: unknown mapping\n", entry->index); 355 return -1; 356 } 357 } 358 } 359 #endif /* CONFIG_X86_IO_APIC */ 360 361 static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) 362 { 363 struct acpi_prt_entry *entry; 364 struct pci_dev *bridge; 365 u8 bridge_pin, orig_pin = pin; 366 367 entry = acpi_pci_irq_find_prt_entry(dev, pin); 368 if (entry) { 369 #ifdef CONFIG_X86_IO_APIC 370 acpi_reroute_boot_interrupt(dev, entry); 371 #endif /* CONFIG_X86_IO_APIC */ 372 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n", 373 pci_name(dev), pin_name(pin))); 374 return entry; 375 } 376 377 /* 378 * Attempt to derive an IRQ for this device from a parent bridge's 379 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). 380 */ 381 bridge = dev->bus->self; 382 while (bridge) { 383 pin = pci_swizzle_interrupt_pin(dev, pin); 384 385 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { 386 /* PC card has the same IRQ as its cardbridge */ 387 bridge_pin = bridge->pin; 388 if (!bridge_pin) { 389 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 390 "No interrupt pin configured for device %s\n", 391 pci_name(bridge))); 392 return NULL; 393 } 394 pin = bridge_pin; 395 } 396 397 entry = acpi_pci_irq_find_prt_entry(bridge, pin); 398 if (entry) { 399 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 400 "Derived GSI for %s INT %c from %s\n", 401 pci_name(dev), pin_name(orig_pin), 402 pci_name(bridge))); 403 return entry; 404 } 405 406 dev = bridge; 407 bridge = dev->bus->self; 408 } 409 410 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n", 411 pin_name(orig_pin)); 412 return NULL; 413 } 414 415 int acpi_pci_irq_enable(struct pci_dev *dev) 416 { 417 struct acpi_prt_entry *entry; 418 int gsi; 419 u8 pin; 420 int triggering = ACPI_LEVEL_SENSITIVE; 421 int polarity = ACPI_ACTIVE_LOW; 422 char *link = NULL; 423 char link_desc[16]; 424 int rc; 425 426 pin = dev->pin; 427 if (!pin) { 428 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 429 "No interrupt pin configured for device %s\n", 430 pci_name(dev))); 431 return 0; 432 } 433 434 entry = acpi_pci_irq_lookup(dev, pin); 435 if (!entry) { 436 /* 437 * IDE legacy mode controller IRQs are magic. Why do compat 438 * extensions always make such a nasty mess. 439 */ 440 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && 441 (dev->class & 0x05) == 0) 442 return 0; 443 } 444 445 if (entry) { 446 if (entry->link) 447 gsi = acpi_pci_link_allocate_irq(entry->link, 448 entry->index, 449 &triggering, &polarity, 450 &link); 451 else 452 gsi = entry->index; 453 } else 454 gsi = -1; 455 456 /* 457 * No IRQ known to the ACPI subsystem - maybe the BIOS / 458 * driver reported one, then use it. Exit in any case. 459 */ 460 if (gsi < 0) { 461 u32 dev_gsi; 462 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin)); 463 /* Interrupt Line values above 0xF are forbidden */ 464 if (dev->irq > 0 && (dev->irq <= 0xF) && 465 (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) { 466 printk(" - using ISA IRQ %d\n", dev->irq); 467 acpi_register_gsi(&dev->dev, dev_gsi, 468 ACPI_LEVEL_SENSITIVE, 469 ACPI_ACTIVE_LOW); 470 return 0; 471 } else { 472 printk("\n"); 473 return 0; 474 } 475 } 476 477 rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity); 478 if (rc < 0) { 479 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n", 480 pin_name(pin)); 481 return rc; 482 } 483 dev->irq = rc; 484 485 if (link) 486 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); 487 else 488 link_desc[0] = '\0'; 489 490 dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n", 491 pin_name(pin), link_desc, gsi, 492 (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", 493 (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); 494 495 return 0; 496 } 497 498 /* FIXME: implement x86/x86_64 version */ 499 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i) 500 { 501 } 502 503 void acpi_pci_irq_disable(struct pci_dev *dev) 504 { 505 struct acpi_prt_entry *entry; 506 int gsi; 507 u8 pin; 508 509 pin = dev->pin; 510 if (!pin) 511 return; 512 513 entry = acpi_pci_irq_lookup(dev, pin); 514 if (!entry) 515 return; 516 517 if (entry->link) 518 gsi = acpi_pci_link_free_irq(entry->link); 519 else 520 gsi = entry->index; 521 522 /* 523 * TBD: It might be worth clearing dev->irq by magic constant 524 * (e.g. PCI_UNDEFINED_IRQ). 525 */ 526 527 dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin)); 528 acpi_unregister_gsi(gsi); 529 } 530