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