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 = (struct acpi_pci_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 = kmalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); 311 if (!resource) 312 return -ENOMEM; 313 314 memset(resource, 0, sizeof(*resource) + 1); 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 list_head *node = NULL; 480 struct acpi_pci_link *link = NULL; 481 int i = 0; 482 483 484 /* 485 * Update penalties to facilitate IRQ balancing. 486 */ 487 list_for_each(node, &acpi_link.entries) { 488 489 link = list_entry(node, struct acpi_pci_link, node); 490 if (!link) { 491 printk(KERN_ERR PREFIX "Invalid link context\n"); 492 continue; 493 } 494 495 /* 496 * reflect the possible and active irqs in the penalty table -- 497 * useful for breaking ties. 498 */ 499 if (link->irq.possible_count) { 500 int penalty = 501 PIRQ_PENALTY_PCI_POSSIBLE / 502 link->irq.possible_count; 503 504 for (i = 0; i < link->irq.possible_count; i++) { 505 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) 506 acpi_irq_penalty[link->irq. 507 possible[i]] += 508 penalty; 509 } 510 511 } else if (link->irq.active) { 512 acpi_irq_penalty[link->irq.active] += 513 PIRQ_PENALTY_PCI_POSSIBLE; 514 } 515 } 516 /* Add a penalty for the SCI */ 517 acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; 518 519 return 0; 520 } 521 522 static int acpi_irq_balance; /* 0: static, 1: balance */ 523 524 static int acpi_pci_link_allocate(struct acpi_pci_link *link) 525 { 526 int irq; 527 int i; 528 529 530 if (link->irq.initialized) { 531 if (link->refcnt == 0) 532 /* This means the link is disabled but initialized */ 533 acpi_pci_link_set(link, link->irq.active); 534 return 0; 535 } 536 537 /* 538 * search for active IRQ in list of possible IRQs. 539 */ 540 for (i = 0; i < link->irq.possible_count; ++i) { 541 if (link->irq.active == link->irq.possible[i]) 542 break; 543 } 544 /* 545 * forget active IRQ that is not in possible list 546 */ 547 if (i == link->irq.possible_count) { 548 if (acpi_strict) 549 printk(KERN_WARNING PREFIX "_CRS %d not found" 550 " in _PRS\n", link->irq.active); 551 link->irq.active = 0; 552 } 553 554 /* 555 * if active found, use it; else pick entry from end of possible list. 556 */ 557 if (link->irq.active) { 558 irq = link->irq.active; 559 } else { 560 irq = link->irq.possible[link->irq.possible_count - 1]; 561 } 562 563 if (acpi_irq_balance || !link->irq.active) { 564 /* 565 * Select the best IRQ. This is done in reverse to promote 566 * the use of IRQs 9, 10, 11, and >15. 567 */ 568 for (i = (link->irq.possible_count - 1); i >= 0; i--) { 569 if (acpi_irq_penalty[irq] > 570 acpi_irq_penalty[link->irq.possible[i]]) 571 irq = link->irq.possible[i]; 572 } 573 } 574 575 /* Attempt to enable the link device at this IRQ. */ 576 if (acpi_pci_link_set(link, irq)) { 577 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " 578 "Try pci=noacpi or acpi=off\n", 579 acpi_device_name(link->device), 580 acpi_device_bid(link->device)); 581 return -ENODEV; 582 } else { 583 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; 584 printk(PREFIX "%s [%s] enabled at IRQ %d\n", 585 acpi_device_name(link->device), 586 acpi_device_bid(link->device), link->irq.active); 587 } 588 589 link->irq.initialized = 1; 590 591 return 0; 592 } 593 594 /* 595 * acpi_pci_link_allocate_irq 596 * success: return IRQ >= 0 597 * failure: return -1 598 */ 599 600 int 601 acpi_pci_link_allocate_irq(acpi_handle handle, 602 int index, 603 int *triggering, int *polarity, char **name) 604 { 605 int result = 0; 606 struct acpi_device *device = NULL; 607 struct acpi_pci_link *link = NULL; 608 609 610 result = acpi_bus_get_device(handle, &device); 611 if (result) { 612 printk(KERN_ERR PREFIX "Invalid link device\n"); 613 return -1; 614 } 615 616 link = (struct acpi_pci_link *)acpi_driver_data(device); 617 if (!link) { 618 printk(KERN_ERR PREFIX "Invalid link context\n"); 619 return -1; 620 } 621 622 /* TBD: Support multiple index (IRQ) entries per Link Device */ 623 if (index) { 624 printk(KERN_ERR PREFIX "Invalid index %d\n", index); 625 return -1; 626 } 627 628 mutex_lock(&acpi_link_lock); 629 if (acpi_pci_link_allocate(link)) { 630 mutex_unlock(&acpi_link_lock); 631 return -1; 632 } 633 634 if (!link->irq.active) { 635 mutex_unlock(&acpi_link_lock); 636 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); 637 return -1; 638 } 639 link->refcnt++; 640 mutex_unlock(&acpi_link_lock); 641 642 if (triggering) 643 *triggering = link->irq.triggering; 644 if (polarity) 645 *polarity = link->irq.polarity; 646 if (name) 647 *name = acpi_device_bid(link->device); 648 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 649 "Link %s is referenced\n", 650 acpi_device_bid(link->device))); 651 return (link->irq.active); 652 } 653 654 /* 655 * We don't change link's irq information here. After it is reenabled, we 656 * continue use the info 657 */ 658 int acpi_pci_link_free_irq(acpi_handle handle) 659 { 660 struct acpi_device *device = NULL; 661 struct acpi_pci_link *link = NULL; 662 acpi_status result; 663 664 665 result = acpi_bus_get_device(handle, &device); 666 if (result) { 667 printk(KERN_ERR PREFIX "Invalid link device\n"); 668 return -1; 669 } 670 671 link = (struct acpi_pci_link *)acpi_driver_data(device); 672 if (!link) { 673 printk(KERN_ERR PREFIX "Invalid link context\n"); 674 return -1; 675 } 676 677 mutex_lock(&acpi_link_lock); 678 if (!link->irq.initialized) { 679 mutex_unlock(&acpi_link_lock); 680 printk(KERN_ERR PREFIX "Link isn't initialized\n"); 681 return -1; 682 } 683 #ifdef FUTURE_USE 684 /* 685 * The Link reference count allows us to _DISable an unused link 686 * and suspend time, and set it again on resume. 687 * However, 2.6.12 still has irq_router.resume 688 * which blindly restores the link state. 689 * So we disable the reference count method 690 * to prevent duplicate acpi_pci_link_set() 691 * which would harm some systems 692 */ 693 link->refcnt--; 694 #endif 695 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 696 "Link %s is dereferenced\n", 697 acpi_device_bid(link->device))); 698 699 if (link->refcnt == 0) { 700 acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL); 701 } 702 mutex_unlock(&acpi_link_lock); 703 return (link->irq.active); 704 } 705 706 /* -------------------------------------------------------------------------- 707 Driver Interface 708 -------------------------------------------------------------------------- */ 709 710 static int acpi_pci_link_add(struct acpi_device *device) 711 { 712 int result = 0; 713 struct acpi_pci_link *link = NULL; 714 int i = 0; 715 int found = 0; 716 717 718 if (!device) 719 return -EINVAL; 720 721 link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); 722 if (!link) 723 return -ENOMEM; 724 memset(link, 0, sizeof(struct acpi_pci_link)); 725 726 link->device = device; 727 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); 728 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); 729 acpi_driver_data(device) = link; 730 731 mutex_lock(&acpi_link_lock); 732 result = acpi_pci_link_get_possible(link); 733 if (result) 734 goto end; 735 736 /* query and set link->irq.active */ 737 acpi_pci_link_get_current(link); 738 739 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), 740 acpi_device_bid(device)); 741 for (i = 0; i < link->irq.possible_count; i++) { 742 if (link->irq.active == link->irq.possible[i]) { 743 printk(" *%d", link->irq.possible[i]); 744 found = 1; 745 } else 746 printk(" %d", link->irq.possible[i]); 747 } 748 749 printk(")"); 750 751 if (!found) 752 printk(" *%d", link->irq.active); 753 754 if (!link->device->status.enabled) 755 printk(", disabled."); 756 757 printk("\n"); 758 759 /* TBD: Acquire/release lock */ 760 list_add_tail(&link->node, &acpi_link.entries); 761 acpi_link.count++; 762 763 end: 764 /* disable all links -- to be activated on use */ 765 acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL); 766 mutex_unlock(&acpi_link_lock); 767 768 if (result) 769 kfree(link); 770 771 return result; 772 } 773 774 static int acpi_pci_link_resume(struct acpi_pci_link *link) 775 { 776 777 if (link->refcnt && link->irq.active && link->irq.initialized) 778 return (acpi_pci_link_set(link, link->irq.active)); 779 else 780 return 0; 781 } 782 783 static int irqrouter_resume(struct sys_device *dev) 784 { 785 struct list_head *node = NULL; 786 struct acpi_pci_link *link = NULL; 787 788 789 /* Make sure SCI is enabled again (Apple firmware bug?) */ 790 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK); 791 792 list_for_each(node, &acpi_link.entries) { 793 link = list_entry(node, struct acpi_pci_link, node); 794 if (!link) { 795 printk(KERN_ERR PREFIX "Invalid link context\n"); 796 continue; 797 } 798 acpi_pci_link_resume(link); 799 } 800 return 0; 801 } 802 803 static int acpi_pci_link_remove(struct acpi_device *device, int type) 804 { 805 struct acpi_pci_link *link = NULL; 806 807 808 if (!device || !acpi_driver_data(device)) 809 return -EINVAL; 810 811 link = (struct acpi_pci_link *)acpi_driver_data(device); 812 813 mutex_lock(&acpi_link_lock); 814 list_del(&link->node); 815 mutex_unlock(&acpi_link_lock); 816 817 kfree(link); 818 819 return 0; 820 } 821 822 /* 823 * modify acpi_irq_penalty[] from cmdline 824 */ 825 static int __init acpi_irq_penalty_update(char *str, int used) 826 { 827 int i; 828 829 for (i = 0; i < 16; i++) { 830 int retval; 831 int irq; 832 833 retval = get_option(&str, &irq); 834 835 if (!retval) 836 break; /* no number found */ 837 838 if (irq < 0) 839 continue; 840 841 if (irq >= ACPI_MAX_IRQS) 842 continue; 843 844 if (used) 845 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; 846 else 847 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; 848 849 if (retval != 2) /* no next number */ 850 break; 851 } 852 return 1; 853 } 854 855 /* 856 * We'd like PNP to call this routine for the 857 * single ISA_USED value for each legacy device. 858 * But instead it calls us with each POSSIBLE setting. 859 * There is no ISA_POSSIBLE weight, so we simply use 860 * the (small) PCI_USING penalty. 861 */ 862 void acpi_penalize_isa_irq(int irq, int active) 863 { 864 if (active) 865 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; 866 else 867 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; 868 } 869 870 /* 871 * Over-ride default table to reserve additional IRQs for use by ISA 872 * e.g. acpi_irq_isa=5 873 * Useful for telling ACPI how not to interfere with your ISA sound card. 874 */ 875 static int __init acpi_irq_isa(char *str) 876 { 877 return acpi_irq_penalty_update(str, 1); 878 } 879 880 __setup("acpi_irq_isa=", acpi_irq_isa); 881 882 /* 883 * Over-ride default table to free additional IRQs for use by PCI 884 * e.g. acpi_irq_pci=7,15 885 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. 886 */ 887 static int __init acpi_irq_pci(char *str) 888 { 889 return acpi_irq_penalty_update(str, 0); 890 } 891 892 __setup("acpi_irq_pci=", acpi_irq_pci); 893 894 static int __init acpi_irq_nobalance_set(char *str) 895 { 896 acpi_irq_balance = 0; 897 return 1; 898 } 899 900 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); 901 902 int __init acpi_irq_balance_set(char *str) 903 { 904 acpi_irq_balance = 1; 905 return 1; 906 } 907 908 __setup("acpi_irq_balance", acpi_irq_balance_set); 909 910 /* FIXME: we will remove this interface after all drivers call pci_disable_device */ 911 static struct sysdev_class irqrouter_sysdev_class = { 912 set_kset_name("irqrouter"), 913 .resume = irqrouter_resume, 914 }; 915 916 static struct sys_device device_irqrouter = { 917 .id = 0, 918 .cls = &irqrouter_sysdev_class, 919 }; 920 921 static int __init irqrouter_init_sysfs(void) 922 { 923 int error; 924 925 926 if (acpi_disabled || acpi_noirq) 927 return 0; 928 929 error = sysdev_class_register(&irqrouter_sysdev_class); 930 if (!error) 931 error = sysdev_register(&device_irqrouter); 932 933 return error; 934 } 935 936 device_initcall(irqrouter_init_sysfs); 937 938 static int __init acpi_pci_link_init(void) 939 { 940 941 if (acpi_noirq) 942 return 0; 943 944 acpi_link.count = 0; 945 INIT_LIST_HEAD(&acpi_link.entries); 946 947 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) 948 return -ENODEV; 949 950 return 0; 951 } 952 953 subsys_initcall(acpi_pci_link_init); 954