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