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