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