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