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