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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 | /* * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $) * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * TBD: * 1. Support more than one IRQ resource entry per link device (index). * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities * for IRQ management (e.g. start()->_SRS). */ #include <linux/sysdev.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/proc_fs.h> #include <linux/spinlock.h> #include <linux/pm.h> #include <linux/pci.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define _COMPONENT ACPI_PCI_COMPONENT ACPI_MODULE_NAME("pci_link") #define ACPI_PCI_LINK_CLASS "pci_irq_routing" #define ACPI_PCI_LINK_HID "PNP0C0F" #define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver" #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" #define ACPI_PCI_LINK_FILE_INFO "info" #define ACPI_PCI_LINK_FILE_STATUS "state" #define ACPI_PCI_LINK_MAX_POSSIBLE 16 static int acpi_pci_link_add(struct acpi_device *device); static int acpi_pci_link_remove(struct acpi_device *device, int type); static struct acpi_driver acpi_pci_link_driver = { .name = ACPI_PCI_LINK_DRIVER_NAME, .class = ACPI_PCI_LINK_CLASS, .ids = ACPI_PCI_LINK_HID, .ops = { .add = acpi_pci_link_add, .remove = acpi_pci_link_remove, }, }; /* * If a link is initialized, we never change its active and initialized * later even the link is disable. Instead, we just repick the active irq */ struct acpi_pci_link_irq { u8 active; /* Current IRQ */ u8 triggering; /* All IRQs */ u8 polarity; /* All IRQs */ u8 resource_type; u8 possible_count; u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; u8 initialized:1; u8 reserved:7; }; struct acpi_pci_link { struct list_head node; struct acpi_device *device; acpi_handle handle; struct acpi_pci_link_irq irq; int refcnt; }; static struct { int count; struct list_head entries; } acpi_link; DECLARE_MUTEX(acpi_link_lock); /* -------------------------------------------------------------------------- PCI Link Device Management -------------------------------------------------------------------------- */ /* * set context (link) possible list from resource list */ static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, void *context) { struct acpi_pci_link *link = (struct acpi_pci_link *)context; u32 i = 0; ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible"); switch (resource->type) { case ACPI_RESOURCE_TYPE_START_DEPENDENT: return_ACPI_STATUS(AE_OK); case ACPI_RESOURCE_TYPE_IRQ: { struct acpi_resource_irq *p = &resource->data.irq; if (!p || !p->interrupt_count) { ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank IRQ resource\n")); return_ACPI_STATUS(AE_OK); } for (i = 0; (i < p->interrupt_count && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { if (!p->interrupts[i]) { ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i])); continue; } link->irq.possible[i] = p->interrupts[i]; link->irq.possible_count++; } link->irq.triggering = p->triggering; link->irq.polarity = p->polarity; link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; break; } case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: { struct acpi_resource_extended_irq *p = &resource->data.extended_irq; if (!p || !p->interrupt_count) { ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank EXT IRQ resource\n")); return_ACPI_STATUS(AE_OK); } for (i = 0; (i < p->interrupt_count && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { if (!p->interrupts[i]) { ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i])); continue; } link->irq.possible[i] = p->interrupts[i]; link->irq.possible_count++; } link->irq.triggering = p->triggering; link->irq.polarity = p->polarity; link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; break; } default: ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource is not an IRQ entry\n")); return_ACPI_STATUS(AE_OK); } return_ACPI_STATUS(AE_CTRL_TERMINATE); } static int acpi_pci_link_get_possible(struct acpi_pci_link *link) { acpi_status status; ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible"); if (!link) return_VALUE(-EINVAL); status = acpi_walk_resources(link->handle, METHOD_NAME__PRS, acpi_pci_link_check_possible, link); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n")); return_VALUE(-ENODEV); } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d possible IRQs\n", link->irq.possible_count)); return_VALUE(0); } static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, void *context) { int *irq = (int *)context; ACPI_FUNCTION_TRACE("acpi_pci_link_check_current"); switch (resource->type) { case ACPI_RESOURCE_TYPE_IRQ: { struct acpi_resource_irq *p = &resource->data.irq; if (!p || !p->interrupt_count) { /* * IRQ descriptors may have no IRQ# bits set, * particularly those those w/ _STA disabled */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Blank IRQ resource\n")); return_ACPI_STATUS(AE_OK); } *irq = p->interrupts[0]; break; } case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: { struct acpi_resource_extended_irq *p = &resource->data.extended_irq; if (!p || !p->interrupt_count) { /* * extended IRQ descriptors must * return at least 1 IRQ */ ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank EXT IRQ resource\n")); return_ACPI_STATUS(AE_OK); } *irq = p->interrupts[0]; break; } break; default: ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource %d isn't an IRQ\n", resource->type)); case ACPI_RESOURCE_TYPE_END_TAG: return_ACPI_STATUS(AE_OK); } return_ACPI_STATUS(AE_CTRL_TERMINATE); } /* * Run _CRS and set link->irq.active * * return value: * 0 - success * !0 - failure */ static int acpi_pci_link_get_current(struct acpi_pci_link *link) { int result = 0; acpi_status status = AE_OK; int irq = 0; ACPI_FUNCTION_TRACE("acpi_pci_link_get_current"); if (!link || !link->handle) return_VALUE(-EINVAL); link->irq.active = 0; /* in practice, status disabled is meaningless, ignore it */ if (acpi_strict) { /* Query _STA, set link->device->status */ result = acpi_bus_get_status(link->device); if (result) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n")); goto end; } if (!link->device->status.enabled) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); return_VALUE(0); } } /* * Query and parse _CRS to get the current IRQ assignment. */ status = acpi_walk_resources(link->handle, METHOD_NAME__CRS, acpi_pci_link_check_current, &irq); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n")); result = -ENODEV; goto end; } if (acpi_strict && !irq) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n")); result = -ENODEV; } link->irq.active = irq; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); end: return_VALUE(result); } static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) { int result = 0; acpi_status status = AE_OK; struct { struct acpi_resource res; struct acpi_resource end; } *resource; struct acpi_buffer buffer = { 0, NULL }; ACPI_FUNCTION_TRACE("acpi_pci_link_set"); if (!link || !irq) return_VALUE(-EINVAL); resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC); if (!resource) return_VALUE(-ENOMEM); memset(resource, 0, sizeof(*resource) + 1); buffer.length = sizeof(*resource) + 1; buffer.pointer = resource; switch (link->irq.resource_type) { case ACPI_RESOURCE_TYPE_IRQ: resource->res.type = ACPI_RESOURCE_TYPE_IRQ; resource->res.length = sizeof(struct acpi_resource); resource->res.data.irq.triggering = link->irq.triggering; resource->res.data.irq.polarity = link->irq.polarity; if (link->irq.triggering == ACPI_EDGE_SENSITIVE) resource->res.data.irq.sharable = ACPI_EXCLUSIVE; else resource->res.data.irq.sharable = ACPI_SHARED; resource->res.data.irq.interrupt_count = 1; resource->res.data.irq.interrupts[0] = irq; break; case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; resource->res.length = sizeof(struct acpi_resource); resource->res.data.extended_irq.producer_consumer = ACPI_CONSUMER; resource->res.data.extended_irq.triggering = link->irq.triggering; resource->res.data.extended_irq.polarity = link->irq.polarity; if (link->irq.triggering == ACPI_EDGE_SENSITIVE) resource->res.data.irq.sharable = ACPI_EXCLUSIVE; else resource->res.data.irq.sharable = ACPI_SHARED; resource->res.data.extended_irq.interrupt_count = 1; resource->res.data.extended_irq.interrupts[0] = irq; /* ignore resource_source, it's optional */ break; default: printk("ACPI BUG: resource_type %d\n", link->irq.resource_type); result = -EINVAL; goto end; } resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; /* Attempt to set the resource */ status = acpi_set_current_resources(link->handle, &buffer); /* check for total failure */ if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n")); result = -ENODEV; goto end; } /* Query _STA, set device->status */ result = acpi_bus_get_status(link->device); if (result) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n")); goto end; } if (!link->device->status.enabled) { printk(KERN_WARNING PREFIX "%s [%s] disabled and referenced, BIOS bug.\n", acpi_device_name(link->device), acpi_device_bid(link->device)); } /* Query _CRS, set link->irq.active */ result = acpi_pci_link_get_current(link); if (result) { goto end; } /* * Is current setting not what we set? * set link->irq.active */ if (link->irq.active != irq) { /* * policy: when _CRS doesn't return what we just _SRS * assume _SRS worked and override _CRS value. */ printk(KERN_WARNING PREFIX "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", acpi_device_name(link->device), acpi_device_bid(link->device), link->irq.active, irq); link->irq.active = irq; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); end: kfree(resource); return_VALUE(result); } /* -------------------------------------------------------------------------- PCI Link IRQ Management -------------------------------------------------------------------------- */ /* * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt * Link Devices to move the PIRQs around to minimize sharing. * * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs * that the BIOS has already set to active. This is necessary because * ACPI has no automatic means of knowing what ISA IRQs are used. Note that * if the BIOS doesn't set a Link Device active, ACPI needs to program it * even if acpi_irq_nobalance is set. * * A tables of penalties avoids directing PCI interrupts to well known * ISA IRQs. Boot params are available to over-ride the default table: * * List interrupts that are free for PCI use. * acpi_irq_pci=n[,m] * * List interrupts that should not be used for PCI: * acpi_irq_isa=n[,m] * * Note that PCI IRQ routers have a list of possible IRQs, * which may not include the IRQs this table says are available. * * Since this heuristic can't tell the difference between a link * that no device will attach to, vs. a link which may be shared * by multiple active devices -- it is not optimal. * * If interrupt performance is that important, get an IO-APIC system * with a pin dedicated to each device. Or for that matter, an MSI * enabled system. */ #define ACPI_MAX_IRQS 256 #define ACPI_MAX_ISA_IRQ 16 #define PIRQ_PENALTY_PCI_AVAILABLE (0) #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) #define PIRQ_PENALTY_PCI_USING (16*16*16) #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) static int acpi_irq_penalty[ACPI_MAX_IRQS] = { PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ /* >IRQ15 */ }; int __init acpi_irq_penalty_init(void) { struct list_head *node = NULL; struct acpi_pci_link *link = NULL; int i = 0; ACPI_FUNCTION_TRACE("acpi_irq_penalty_init"); /* * Update penalties to facilitate IRQ balancing. */ list_for_each(node, &acpi_link.entries) { link = list_entry(node, struct acpi_pci_link, node); if (!link) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); continue; } /* * reflect the possible and active irqs in the penalty table -- * useful for breaking ties. */ if (link->irq.possible_count) { int penalty = PIRQ_PENALTY_PCI_POSSIBLE / link->irq.possible_count; for (i = 0; i < link->irq.possible_count; i++) { if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) acpi_irq_penalty[link->irq. possible[i]] += penalty; } } else if (link->irq.active) { acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_POSSIBLE; } } /* Add a penalty for the SCI */ acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; return_VALUE(0); } static int acpi_irq_balance; /* 0: static, 1: balance */ static int acpi_pci_link_allocate(struct acpi_pci_link *link) { int irq; int i; ACPI_FUNCTION_TRACE("acpi_pci_link_allocate"); if (link->irq.initialized) { if (link->refcnt == 0) /* This means the link is disabled but initialized */ acpi_pci_link_set(link, link->irq.active); return_VALUE(0); } /* * search for active IRQ in list of possible IRQs. */ for (i = 0; i < link->irq.possible_count; ++i) { if (link->irq.active == link->irq.possible[i]) break; } /* * forget active IRQ that is not in possible list */ if (i == link->irq.possible_count) { if (acpi_strict) printk(KERN_WARNING PREFIX "_CRS %d not found" " in _PRS\n", link->irq.active); link->irq.active = 0; } /* * if active found, use it; else pick entry from end of possible list. */ if (link->irq.active) { irq = link->irq.active; } else { irq = link->irq.possible[link->irq.possible_count - 1]; } if (acpi_irq_balance || !link->irq.active) { /* * Select the best IRQ. This is done in reverse to promote * the use of IRQs 9, 10, 11, and >15. */ for (i = (link->irq.possible_count - 1); i >= 0; i--) { if (acpi_irq_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]]) irq = link->irq.possible[i]; } } /* Attempt to enable the link device at this IRQ. */ if (acpi_pci_link_set(link, irq)) { printk(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n" "Try pci=noacpi or acpi=off\n", acpi_device_name(link->device), acpi_device_bid(link->device)); return_VALUE(-ENODEV); } else { acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; printk(PREFIX "%s [%s] enabled at IRQ %d\n", acpi_device_name(link->device), acpi_device_bid(link->device), link->irq.active); } link->irq.initialized = 1; return_VALUE(0); } /* * acpi_pci_link_allocate_irq * success: return IRQ >= 0 * failure: return -1 */ int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, int *polarity, char **name) { int result = 0; struct acpi_device *device = NULL; struct acpi_pci_link *link = NULL; ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq"); result = acpi_bus_get_device(handle, &device); if (result) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); return_VALUE(-1); } link = (struct acpi_pci_link *)acpi_driver_data(device); if (!link) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); return_VALUE(-1); } /* TBD: Support multiple index (IRQ) entries per Link Device */ if (index) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index)); return_VALUE(-1); } down(&acpi_link_lock); if (acpi_pci_link_allocate(link)) { up(&acpi_link_lock); return_VALUE(-1); } if (!link->irq.active) { up(&acpi_link_lock); ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n")); return_VALUE(-1); } link->refcnt++; up(&acpi_link_lock); if (triggering) *triggering = link->irq.triggering; if (polarity) *polarity = link->irq.polarity; if (name) *name = acpi_device_bid(link->device); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link %s is referenced\n", acpi_device_bid(link->device))); return_VALUE(link->irq.active); } /* * We don't change link's irq information here. After it is reenabled, we * continue use the info */ int acpi_pci_link_free_irq(acpi_handle handle) { struct acpi_device *device = NULL; struct acpi_pci_link *link = NULL; acpi_status result; ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq"); result = acpi_bus_get_device(handle, &device); if (result) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); return_VALUE(-1); } link = (struct acpi_pci_link *)acpi_driver_data(device); if (!link) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); return_VALUE(-1); } down(&acpi_link_lock); if (!link->irq.initialized) { up(&acpi_link_lock); ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n")); return_VALUE(-1); } #ifdef FUTURE_USE /* * The Link reference count allows us to _DISable an unused link * and suspend time, and set it again on resume. * However, 2.6.12 still has irq_router.resume * which blindly restores the link state. * So we disable the reference count method * to prevent duplicate acpi_pci_link_set() * which would harm some systems */ link->refcnt--; #endif ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link %s is dereferenced\n", acpi_device_bid(link->device))); if (link->refcnt == 0) { acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); } up(&acpi_link_lock); return_VALUE(link->irq.active); } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static int acpi_pci_link_add(struct acpi_device *device) { int result = 0; struct acpi_pci_link *link = NULL; int i = 0; int found = 0; ACPI_FUNCTION_TRACE("acpi_pci_link_add"); if (!device) return_VALUE(-EINVAL); link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); if (!link) return_VALUE(-ENOMEM); memset(link, 0, sizeof(struct acpi_pci_link)); link->device = device; link->handle = device->handle; strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); acpi_driver_data(device) = link; down(&acpi_link_lock); result = acpi_pci_link_get_possible(link); if (result) goto end; /* query and set link->irq.active */ acpi_pci_link_get_current(link); printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), acpi_device_bid(device)); for (i = 0; i < link->irq.possible_count; i++) { if (link->irq.active == link->irq.possible[i]) { printk(" *%d", link->irq.possible[i]); found = 1; } else printk(" %d", link->irq.possible[i]); } printk(")"); if (!found) printk(" *%d", link->irq.active); if (!link->device->status.enabled) printk(", disabled."); printk("\n"); /* TBD: Acquire/release lock */ list_add_tail(&link->node, &acpi_link.entries); acpi_link.count++; end: /* disable all links -- to be activated on use */ acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); up(&acpi_link_lock); if (result) kfree(link); return_VALUE(result); } static int acpi_pci_link_resume(struct acpi_pci_link *link) { ACPI_FUNCTION_TRACE("acpi_pci_link_resume"); if (link->refcnt && link->irq.active && link->irq.initialized) return_VALUE(acpi_pci_link_set(link, link->irq.active)); else return_VALUE(0); } /* * FIXME: this is a workaround to avoid nasty warning. It will be removed * after every device calls pci_disable_device in .resume. */ int acpi_in_resume; static int irqrouter_resume(struct sys_device *dev) { struct list_head *node = NULL; struct acpi_pci_link *link = NULL; ACPI_FUNCTION_TRACE("irqrouter_resume"); acpi_in_resume = 1; list_for_each(node, &acpi_link.entries) { link = list_entry(node, struct acpi_pci_link, node); if (!link) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); continue; } acpi_pci_link_resume(link); } acpi_in_resume = 0; return_VALUE(0); } static int acpi_pci_link_remove(struct acpi_device *device, int type) { struct acpi_pci_link *link = NULL; ACPI_FUNCTION_TRACE("acpi_pci_link_remove"); if (!device || !acpi_driver_data(device)) return_VALUE(-EINVAL); link = (struct acpi_pci_link *)acpi_driver_data(device); down(&acpi_link_lock); list_del(&link->node); up(&acpi_link_lock); kfree(link); return_VALUE(0); } /* * modify acpi_irq_penalty[] from cmdline */ static int __init acpi_irq_penalty_update(char *str, int used) { int i; for (i = 0; i < 16; i++) { int retval; int irq; retval = get_option(&str, &irq); if (!retval) break; /* no number found */ if (irq < 0) continue; if (irq >= ACPI_MAX_IRQS) continue; if (used) acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; else acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; if (retval != 2) /* no next number */ break; } return 1; } /* * We'd like PNP to call this routine for the * single ISA_USED value for each legacy device. * But instead it calls us with each POSSIBLE setting. * There is no ISA_POSSIBLE weight, so we simply use * the (small) PCI_USING penalty. */ void acpi_penalize_isa_irq(int irq, int active) { if (active) acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; else acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; } /* * Over-ride default table to reserve additional IRQs for use by ISA * e.g. acpi_irq_isa=5 * Useful for telling ACPI how not to interfere with your ISA sound card. */ static int __init acpi_irq_isa(char *str) { return acpi_irq_penalty_update(str, 1); } __setup("acpi_irq_isa=", acpi_irq_isa); /* * Over-ride default table to free additional IRQs for use by PCI * e.g. acpi_irq_pci=7,15 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. */ static int __init acpi_irq_pci(char *str) { return acpi_irq_penalty_update(str, 0); } __setup("acpi_irq_pci=", acpi_irq_pci); static int __init acpi_irq_nobalance_set(char *str) { acpi_irq_balance = 0; return 1; } __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); int __init acpi_irq_balance_set(char *str) { acpi_irq_balance = 1; return 1; } __setup("acpi_irq_balance", acpi_irq_balance_set); /* FIXME: we will remove this interface after all drivers call pci_disable_device */ static struct sysdev_class irqrouter_sysdev_class = { set_kset_name("irqrouter"), .resume = irqrouter_resume, }; static struct sys_device device_irqrouter = { .id = 0, .cls = &irqrouter_sysdev_class, }; static int __init irqrouter_init_sysfs(void) { int error; ACPI_FUNCTION_TRACE("irqrouter_init_sysfs"); if (acpi_disabled || acpi_noirq) return_VALUE(0); error = sysdev_class_register(&irqrouter_sysdev_class); if (!error) error = sysdev_register(&device_irqrouter); return_VALUE(error); } device_initcall(irqrouter_init_sysfs); static int __init acpi_pci_link_init(void) { ACPI_FUNCTION_TRACE("acpi_pci_link_init"); if (acpi_noirq) return_VALUE(0); acpi_link.count = 0; INIT_LIST_HEAD(&acpi_link.entries); if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) return_VALUE(-ENODEV); return_VALUE(0); } subsys_initcall(acpi_pci_link_init); |