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