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