drivers/acpi/pci_irq.c

   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  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27
  28 <<<<<<< HEAD:drivers/acpi/pci_irq.c
  29 =======
  30 #include <linux/dmi.h>
  31 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/pci_irq.c
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/init.h>
  35 #include <linux/types.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/pm.h>
  39 #include <linux/pci.h>
  40 #include <linux/acpi.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43
  44 #define _COMPONENT              ACPI_PCI_COMPONENT
  45 ACPI_MODULE_NAME("pci_irq");
  46
  47 static struct acpi_prt_list acpi_prt;
  48 static DEFINE_SPINLOCK(acpi_prt_lock);
  49
  50 /* --------------------------------------------------------------------------
  51                          PCI IRQ Routing Table (PRT) Support
  52    -------------------------------------------------------------------------- */
  53
  54 static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
  55                                                           int bus,
  56                                                           int device, int pin)
  57 {
  58         struct acpi_prt_entry *entry = NULL;
  59
  60         if (!acpi_prt.count)
  61                 return NULL;
  62
  63         /*
  64          * Parse through all PRT entries looking for a match on the specified
  65          * PCI device's segment, bus, device, and pin (don't care about func).
  66          *
  67          */
  68         spin_lock(&acpi_prt_lock);
  69         list_for_each_entry(entry, &acpi_prt.entries, node) {
  70                 if ((segment == entry->id.segment)
  71                     && (bus == entry->id.bus)
  72                     && (device == entry->id.device)
  73                     && (pin == entry->pin)) {
  74                         spin_unlock(&acpi_prt_lock);
  75                         return entry;
  76                 }
  77         }
  78
  79         spin_unlock(&acpi_prt_lock);
  80         return NULL;
  81 }
  82
  83 <<<<<<< HEAD:drivers/acpi/pci_irq.c
  84 =======
  85 /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
  86 static struct dmi_system_id medion_md9580[] = {
  87         {
  88                 .ident = "Medion MD9580-F laptop",
  89                 .matches = {
  90                         DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
  91                         DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
  92                 },
  93         },
  94         { }
  95 };
  96
  97 /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
  98 static struct dmi_system_id dell_optiplex[] = {
  99         {
 100                 .ident = "Dell Optiplex GX1",
 101                 .matches = {
 102                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 103                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
 104                 },
 105         },
 106         { }
 107 };
 108
 109 /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
 110 static struct dmi_system_id hp_t5710[] = {
 111         {
 112                 .ident = "HP t5710",
 113                 .matches = {
 114                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 115                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
 116                         DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
 117                 },
 118         },
 119         { }
 120 };
 121
 122 struct prt_quirk {
 123         struct dmi_system_id    *system;
 124         unsigned int            segment;
 125         unsigned int            bus;
 126         unsigned int            device;
 127         unsigned char           pin;
 128         char                    *source;        /* according to BIOS */
 129         char                    *actual_source;
 130 };
 131
 132 /*
 133  * These systems have incorrect _PRT entries.  The BIOS claims the PCI
 134  * interrupt at the listed segment/bus/device/pin is connected to the first
 135  * link device, but it is actually connected to the second.
 136  */
 137 static struct prt_quirk prt_quirks[] = {
 138         { medion_md9580, 0, 0, 9, 'A',
 139                 "\\_SB_.PCI0.ISA.LNKA",
 140                 "\\_SB_.PCI0.ISA.LNKB"},
 141         { dell_optiplex, 0, 0, 0xd, 'A',
 142                 "\\_SB_.LNKB",
 143                 "\\_SB_.LNKA"},
 144         { hp_t5710, 0, 0, 1, 'A',
 145                 "\\_SB_.PCI0.LNK1",
 146                 "\\_SB_.PCI0.LNK3"},
 147 };
 148
 149 static void
 150 do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
 151 {
 152         int i;
 153         struct prt_quirk *quirk;
 154
 155         for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
 156                 quirk = &prt_quirks[i];
 157
 158                 /* All current quirks involve link devices, not GSIs */
 159                 if (!prt->source)
 160                         continue;
 161
 162                 if (dmi_check_system(quirk->system) &&
 163                     entry->id.segment == quirk->segment &&
 164                     entry->id.bus == quirk->bus &&
 165                     entry->id.device == quirk->device &&
 166                     entry->pin + 'A' == quirk->pin &&
 167                     !strcmp(prt->source, quirk->source) &&
 168                     strlen(prt->source) >= strlen(quirk->actual_source)) {
 169                         printk(KERN_WARNING PREFIX "firmware reports "
 170                                 "%04x:%02x:%02x[%c] connected to %s; "
 171                                 "changing to %s\n",
 172                                 entry->id.segment, entry->id.bus,
 173                                 entry->id.device, 'A' + entry->pin,
 174                                 prt->source, quirk->actual_source);
 175                         strcpy(prt->source, quirk->actual_source);
 176                 }
 177         }
 178 }
 179
 180 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/pci_irq.c
 181 static int
 182 acpi_pci_irq_add_entry(acpi_handle handle,
 183                        int segment, int bus, struct acpi_pci_routing_table *prt)
 184 {
 185         struct acpi_prt_entry *entry = NULL;
 186
 187
 188         if (!prt)
 189                 return -EINVAL;
 190
 191         entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
 192         if (!entry)
 193                 return -ENOMEM;
 194
 195         entry->id.segment = segment;
 196         entry->id.bus = bus;
 197         entry->id.device = (prt->address >> 16) & 0xFFFF;
 198         entry->id.function = prt->address & 0xFFFF;
 199         entry->pin = prt->pin;
 200
 201 <<<<<<< HEAD:drivers/acpi/pci_irq.c
 202 =======
 203         do_prt_fixups(entry, prt);
 204
 205 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/pci_irq.c
 206         /*
 207          * Type 1: Dynamic
 208          * ---------------
 209          * The 'source' field specifies the PCI interrupt link device used to
 210          * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
 211          * indicates which resource descriptor in the resource template (of
 212          * the link device) this interrupt is allocated from.
 213          *
 214          * NOTE: Don't query the Link Device for IRQ information at this time
 215          *       because Link Device enumeration may not have occurred yet
 216          *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
 217          *       namespace).
 218          */
 219         if (prt->source[0]) {
 220                 acpi_get_handle(handle, prt->source, &entry->link.handle);
 221                 entry->link.index = prt->source_index;
 222         }
 223         /*
 224          * Type 2: Static
 225          * --------------
 226          * The 'source' field is NULL, and the 'source_index' field specifies
 227          * the IRQ value, which is hardwired to specific interrupt inputs on
 228          * the interrupt controller.
 229          */
 230         else
 231                 entry->link.index = prt->source_index;
 232
 233         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 234                               "      %02X:%02X:%02X[%c] -> %s[%d]\n",
 235                               entry->id.segment, entry->id.bus,
 236                               entry->id.device, ('A' + entry->pin), prt->source,
 237                               entry->link.index));
 238
 239         spin_lock(&acpi_prt_lock);
 240         list_add_tail(&entry->node, &acpi_prt.entries);
 241         acpi_prt.count++;
 242         spin_unlock(&acpi_prt_lock);
 243
 244         return 0;
 245 }
 246
 247 static void
 248 acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
 249 {
 250         if (segment == entry->id.segment && bus == entry->id.bus) {
 251                 acpi_prt.count--;
 252                 list_del(&entry->node);
 253                 kfree(entry);
 254         }
 255 }
 256
 257 int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
 258 {
 259         acpi_status status = AE_OK;
 260         char *pathname = NULL;
 261         struct acpi_buffer buffer = { 0, NULL };
 262         struct acpi_pci_routing_table *prt = NULL;
 263         struct acpi_pci_routing_table *entry = NULL;
 264         static int first_time = 1;
 265
 266
 267         pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 268         if (!pathname)
 269                 return -ENOMEM;
 270
 271         if (first_time) {
 272                 acpi_prt.count = 0;
 273                 INIT_LIST_HEAD(&acpi_prt.entries);
 274                 first_time = 0;
 275         }
 276
 277         /*
 278          * NOTE: We're given a 'handle' to the _PRT object's parent device
 279          *       (either a PCI root bridge or PCI-PCI bridge).
 280          */
 281
 282         buffer.length = ACPI_PATHNAME_MAX;
 283         buffer.pointer = pathname;
 284         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 285
 286         printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
 287                pathname);
 288
 289         /*
 290          * Evaluate this _PRT and add its entries to our global list (acpi_prt).
 291          */
 292
 293         buffer.length = 0;
 294         buffer.pointer = NULL;
 295         kfree(pathname);
 296         status = acpi_get_irq_routing_table(handle, &buffer);
 297         if (status != AE_BUFFER_OVERFLOW) {
 298                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
 299                                 acpi_format_exception(status)));
 300                 return -ENODEV;
 301         }
 302
 303         prt = kzalloc(buffer.length, GFP_KERNEL);
 304         if (!prt) {
 305                 return -ENOMEM;
 306         }
 307         buffer.pointer = prt;
 308
 309         status = acpi_get_irq_routing_table(handle, &buffer);
 310         if (ACPI_FAILURE(status)) {
 311                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
 312                                 acpi_format_exception(status)));
 313                 kfree(buffer.pointer);
 314                 return -ENODEV;
 315         }
 316
 317         entry = prt;
 318
 319         while (entry && (entry->length > 0)) {
 320                 acpi_pci_irq_add_entry(handle, segment, bus, entry);
 321                 entry = (struct acpi_pci_routing_table *)
 322                     ((unsigned long)entry + entry->length);
 323         }
 324
 325         kfree(prt);
 326
 327         return 0;
 328 }
 329
 330 void acpi_pci_irq_del_prt(int segment, int bus)
 331 {
 332         struct list_head *node = NULL, *n = NULL;
 333         struct acpi_prt_entry *entry = NULL;
 334
 335         if (!acpi_prt.count) {
 336                 return;
 337         }
 338
 339         printk(KERN_DEBUG
 340                "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment,
 341                bus);
 342         spin_lock(&acpi_prt_lock);
 343         list_for_each_safe(node, n, &acpi_prt.entries) {
 344                 entry = list_entry(node, struct acpi_prt_entry, node);
 345
 346                 acpi_pci_irq_del_entry(segment, bus, entry);
 347         }
 348         spin_unlock(&acpi_prt_lock);
 349 }
 350
 351 /* --------------------------------------------------------------------------
 352                           PCI Interrupt Routing Support
 353    -------------------------------------------------------------------------- */
 354 typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
 355
 356 static int
 357 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
 358                       int *triggering, int *polarity, char **link)
 359 {
 360         int irq;
 361
 362
 363         if (entry->link.handle) {
 364                 irq = acpi_pci_link_allocate_irq(entry->link.handle,
 365                                                  entry->link.index, triggering,
 366                                                  polarity, link);
 367                 if (irq < 0) {
 368                         printk(KERN_WARNING PREFIX
 369                                       "Invalid IRQ link routing entry\n");
 370                         return -1;
 371                 }
 372         } else {
 373                 irq = entry->link.index;
 374                 *triggering = ACPI_LEVEL_SENSITIVE;
 375                 *polarity = ACPI_ACTIVE_LOW;
 376         }
 377
 378         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
 379         return irq;
 380 }
 381
 382 static int
 383 acpi_pci_free_irq(struct acpi_prt_entry *entry,
 384                   int *triggering, int *polarity, char **link)
 385 {
 386         int irq;
 387
 388         if (entry->link.handle) {
 389                 irq = acpi_pci_link_free_irq(entry->link.handle);
 390         } else {
 391                 irq = entry->link.index;
 392         }
 393         return irq;
 394 }
 395
 396 /*
 397  * acpi_pci_irq_lookup
 398  * success: return IRQ >= 0
 399  * failure: return -1
 400  */
 401 static int
 402 acpi_pci_irq_lookup(struct pci_bus *bus,
 403                     int device,
 404                     int pin,
 405                     int *triggering,
 406                     int *polarity, char **link, irq_lookup_func func)
 407 {
 408         struct acpi_prt_entry *entry = NULL;
 409         int segment = pci_domain_nr(bus);
 410         int bus_nr = bus->number;
 411         int ret;
 412
 413
 414         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 415                           "Searching for PRT entry for %02x:%02x:%02x[%c]\n",
 416                           segment, bus_nr, device, ('A' + pin)));
 417
 418         entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
 419         if (!entry) {
 420                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n"));
 421                 return -1;
 422         }
 423
 424         ret = func(entry, triggering, polarity, link);
 425         return ret;
 426 }
 427
 428 /*
 429  * acpi_pci_irq_derive
 430  * success: return IRQ >= 0
 431  * failure: return < 0
 432  */
 433 static int
 434 acpi_pci_irq_derive(struct pci_dev *dev,
 435                     int pin,
 436                     int *triggering,
 437                     int *polarity, char **link, irq_lookup_func func)
 438 {
 439         struct pci_dev *bridge = dev;
 440         int irq = -1;
 441         u8 bridge_pin = 0;
 442
 443
 444         if (!dev)
 445                 return -EINVAL;
 446
 447         /*
 448          * Attempt to derive an IRQ for this device from a parent bridge's
 449          * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
 450          */
 451         while (irq < 0 && bridge->bus->self) {
 452                 pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
 453                 bridge = bridge->bus->self;
 454
 455                 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
 456                         /* PC card has the same IRQ as its cardbridge */
 457                         bridge_pin = bridge->pin;
 458                         if (!bridge_pin) {
 459                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 460                                                   "No interrupt pin configured for device %s\n",
 461                                                   pci_name(bridge)));
 462                                 return -1;
 463                         }
 464                         /* Pin is from 0 to 3 */
 465                         bridge_pin--;
 466                         pin = bridge_pin;
 467                 }
 468
 469                 irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
 470                                           pin, triggering, polarity,
 471                                           link, func);
 472         }
 473
 474         if (irq < 0) {
 475                 printk(KERN_WARNING PREFIX "Unable to derive IRQ for device %s\n",
 476                               pci_name(dev));
 477                 return -1;
 478         }
 479
 480         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
 481                           irq, pci_name(dev), pci_name(bridge)));
 482
 483         return irq;
 484 }
 485
 486 /*
 487  * acpi_pci_irq_enable
 488  * success: return 0
 489  * failure: return < 0
 490  */
 491
 492 int acpi_pci_irq_enable(struct pci_dev *dev)
 493 {
 494         int irq = 0;
 495         u8 pin = 0;
 496         int triggering = ACPI_LEVEL_SENSITIVE;
 497         int polarity = ACPI_ACTIVE_LOW;
 498         char *link = NULL;
 499         int rc;
 500
 501
 502         if (!dev)
 503                 return -EINVAL;
 504
 505         pin = dev->pin;
 506         if (!pin) {
 507                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 508                                   "No interrupt pin configured for device %s\n",
 509                                   pci_name(dev)));
 510                 return 0;
 511         }
 512         pin--;
 513
 514         if (!dev->bus) {
 515                 printk(KERN_ERR PREFIX "Invalid (NULL) 'bus' field\n");
 516                 return -ENODEV;
 517         }
 518
 519         /*
 520          * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
 521          * values override any BIOS-assigned IRQs set during boot.
 522          */
 523         irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
 524                                   &triggering, &polarity, &link,
 525                                   acpi_pci_allocate_irq);
 526
 527         /*
 528          * If no PRT entry was found, we'll try to derive an IRQ from the
 529          * device's parent bridge.
 530          */
 531         if (irq < 0)
 532                 irq = acpi_pci_irq_derive(dev, pin, &triggering,
 533                                           &polarity, &link,
 534                                           acpi_pci_allocate_irq);
 535
 536         if (irq < 0) {
 537                 /*
 538                  * IDE legacy mode controller IRQs are magic. Why do compat
 539                  * extensions always make such a nasty mess.
 540                  */
 541                 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
 542                                 (dev->class & 0x05) == 0)
 543                         return 0;
 544         }
 545         /*
 546          * No IRQ known to the ACPI subsystem - maybe the BIOS /
 547          * driver reported one, then use it. Exit in any case.
 548          */
 549         if (irq < 0) {
 550                 printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI",
 551                        pci_name(dev), ('A' + pin));
 552                 /* Interrupt Line values above 0xF are forbidden */
 553                 if (dev->irq > 0 && (dev->irq <= 0xF)) {
 554                         printk(" - using IRQ %d\n", dev->irq);
 555                         acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
 556                                           ACPI_ACTIVE_LOW);
 557                         return 0;
 558                 } else {
 559                         printk("\n");
 560                         return 0;
 561                 }
 562         }
 563
 564         rc = acpi_register_gsi(irq, triggering, polarity);
 565         if (rc < 0) {
 566                 printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: failed "
 567                        "to register GSI\n", pci_name(dev), ('A' + pin));
 568                 return rc;
 569         }
 570         dev->irq = rc;
 571
 572         printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ",
 573                pci_name(dev), 'A' + pin);
 574
 575         if (link)
 576                 printk("Link [%s] -> ", link);
 577
 578         printk("GSI %u (%s, %s) -> IRQ %d\n", irq,
 579                (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
 580                (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
 581
 582         return 0;
 583 }
 584
 585 /* FIXME: implement x86/x86_64 version */
 586 void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
 587 {
 588 }
 589
 590 void acpi_pci_irq_disable(struct pci_dev *dev)
 591 {
 592         int gsi = 0;
 593         u8 pin = 0;
 594         int triggering = ACPI_LEVEL_SENSITIVE;
 595         int polarity = ACPI_ACTIVE_LOW;
 596
 597
 598         if (!dev || !dev->bus)
 599                 return;
 600
 601         pin = dev->pin;
 602         if (!pin)
 603                 return;
 604         pin--;
 605
 606         /*
 607          * First we check the PCI IRQ routing table (PRT) for an IRQ.
 608          */
 609         gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
 610                                   &triggering, &polarity, NULL,
 611                                   acpi_pci_free_irq);
 612         /*
 613          * If no PRT entry was found, we'll try to derive an IRQ from the
 614          * device's parent bridge.
 615          */
 616         if (gsi < 0)
 617                 gsi = acpi_pci_irq_derive(dev, pin,
 618                                           &triggering, &polarity, NULL,
 619                                           acpi_pci_free_irq);
 620         if (gsi < 0)
 621                 return;
 622
 623         /*
 624          * TBD: It might be worth clearing dev->irq by magic constant
 625          * (e.g. PCI_UNDEFINED_IRQ).
 626          */
 627
 628         printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n",
 629                pci_name(dev));
 630
 631         acpi_unregister_gsi(gsi);
 632
 633         return;
 634 }