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