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 42 #include <acpi/acpi_bus.h> 43 #include <acpi/acpi_drivers.h> 44 45 46 #define _COMPONENT ACPI_PCI_COMPONENT 47 ACPI_MODULE_NAME ("pci_link") 48 49 #define ACPI_PCI_LINK_CLASS "pci_irq_routing" 50 #define ACPI_PCI_LINK_HID "PNP0C0F" 51 #define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver" 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 56 #define ACPI_PCI_LINK_MAX_POSSIBLE 16 57 58 static int acpi_pci_link_add (struct acpi_device *device); 59 static int acpi_pci_link_remove (struct acpi_device *device, int type); 60 61 static struct acpi_driver acpi_pci_link_driver = { 62 .name = ACPI_PCI_LINK_DRIVER_NAME, 63 .class = ACPI_PCI_LINK_CLASS, 64 .ids = ACPI_PCI_LINK_HID, 65 .ops = { 66 .add = acpi_pci_link_add, 67 .remove = acpi_pci_link_remove, 68 }, 69 }; 70 71 /* 72 * If a link is initialized, we never change its active and initialized 73 * later even the link is disable. Instead, we just repick the active irq 74 */ 75 struct acpi_pci_link_irq { 76 u8 active; /* Current IRQ */ 77 u8 edge_level; /* All IRQs */ 78 u8 active_high_low; /* All IRQs */ 79 u8 resource_type; 80 u8 possible_count; 81 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; 82 u8 initialized:1; 83 u8 reserved:7; 84 }; 85 86 struct acpi_pci_link { 87 struct list_head node; 88 struct acpi_device *device; 89 acpi_handle handle; 90 struct acpi_pci_link_irq irq; 91 int refcnt; 92 }; 93 94 static struct { 95 int count; 96 struct list_head entries; 97 } acpi_link; 98 DECLARE_MUTEX(acpi_link_lock); 99 100 101 /* -------------------------------------------------------------------------- 102 PCI Link Device Management 103 -------------------------------------------------------------------------- */ 104 105 /* 106 * set context (link) possible list from resource list 107 */ 108 static acpi_status 109 acpi_pci_link_check_possible ( 110 struct acpi_resource *resource, 111 void *context) 112 { 113 struct acpi_pci_link *link = (struct acpi_pci_link *) context; 114 u32 i = 0; 115 116 ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible"); 117 118 switch (resource->id) { 119 case ACPI_RSTYPE_START_DPF: 120 return_ACPI_STATUS(AE_OK); 121 case ACPI_RSTYPE_IRQ: 122 { 123 struct acpi_resource_irq *p = &resource->data.irq; 124 if (!p || !p->number_of_interrupts) { 125 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank IRQ resource\n")); 126 return_ACPI_STATUS(AE_OK); 127 } 128 for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) { 129 if (!p->interrupts[i]) { 130 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i])); 131 continue; 132 } 133 link->irq.possible[i] = p->interrupts[i]; 134 link->irq.possible_count++; 135 } 136 link->irq.edge_level = p->edge_level; 137 link->irq.active_high_low = p->active_high_low; 138 link->irq.resource_type = ACPI_RSTYPE_IRQ; 139 break; 140 } 141 case ACPI_RSTYPE_EXT_IRQ: 142 { 143 struct acpi_resource_ext_irq *p = &resource->data.extended_irq; 144 if (!p || !p->number_of_interrupts) { 145 ACPI_DEBUG_PRINT((ACPI_DB_WARN, 146 "Blank EXT IRQ resource\n")); 147 return_ACPI_STATUS(AE_OK); 148 } 149 for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) { 150 if (!p->interrupts[i]) { 151 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i])); 152 continue; 153 } 154 link->irq.possible[i] = p->interrupts[i]; 155 link->irq.possible_count++; 156 } 157 link->irq.edge_level = p->edge_level; 158 link->irq.active_high_low = p->active_high_low; 159 link->irq.resource_type = ACPI_RSTYPE_EXT_IRQ; 160 break; 161 } 162 default: 163 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 164 "Resource is not an IRQ entry\n")); 165 return_ACPI_STATUS(AE_OK); 166 } 167 168 return_ACPI_STATUS(AE_CTRL_TERMINATE); 169 } 170 171 172 static int 173 acpi_pci_link_get_possible ( 174 struct acpi_pci_link *link) 175 { 176 acpi_status status; 177 178 ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible"); 179 180 if (!link) 181 return_VALUE(-EINVAL); 182 183 status = acpi_walk_resources(link->handle, METHOD_NAME__PRS, 184 acpi_pci_link_check_possible, link); 185 if (ACPI_FAILURE(status)) { 186 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n")); 187 return_VALUE(-ENODEV); 188 } 189 190 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 191 "Found %d possible IRQs\n", link->irq.possible_count)); 192 193 return_VALUE(0); 194 } 195 196 197 static acpi_status 198 acpi_pci_link_check_current ( 199 struct acpi_resource *resource, 200 void *context) 201 { 202 int *irq = (int *) context; 203 204 ACPI_FUNCTION_TRACE("acpi_pci_link_check_current"); 205 206 switch (resource->id) { 207 case ACPI_RSTYPE_IRQ: 208 { 209 struct acpi_resource_irq *p = &resource->data.irq; 210 if (!p || !p->number_of_interrupts) { 211 /* 212 * IRQ descriptors may have no IRQ# bits set, 213 * particularly those those w/ _STA disabled 214 */ 215 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 216 "Blank IRQ resource\n")); 217 return_ACPI_STATUS(AE_OK); 218 } 219 *irq = p->interrupts[0]; 220 break; 221 } 222 case ACPI_RSTYPE_EXT_IRQ: 223 { 224 struct acpi_resource_ext_irq *p = &resource->data.extended_irq; 225 if (!p || !p->number_of_interrupts) { 226 /* 227 * extended IRQ descriptors must 228 * return at least 1 IRQ 229 */ 230 ACPI_DEBUG_PRINT((ACPI_DB_WARN, 231 "Blank EXT IRQ resource\n")); 232 return_ACPI_STATUS(AE_OK); 233 } 234 *irq = p->interrupts[0]; 235 break; 236 } 237 default: 238 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 239 "Resource isn't an IRQ\n")); 240 return_ACPI_STATUS(AE_OK); 241 } 242 return_ACPI_STATUS(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 253 acpi_pci_link_get_current ( 254 struct acpi_pci_link *link) 255 { 256 int result = 0; 257 acpi_status status = AE_OK; 258 int irq = 0; 259 260 ACPI_FUNCTION_TRACE("acpi_pci_link_get_current"); 261 262 if (!link || !link->handle) 263 return_VALUE(-EINVAL); 264 265 link->irq.active = 0; 266 267 /* in practice, status disabled is meaningless, ignore it */ 268 if (acpi_strict) { 269 /* Query _STA, set link->device->status */ 270 result = acpi_bus_get_status(link->device); 271 if (result) { 272 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n")); 273 goto end; 274 } 275 276 if (!link->device->status.enabled) { 277 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); 278 return_VALUE(0); 279 } 280 } 281 282 /* 283 * Query and parse _CRS to get the current IRQ assignment. 284 */ 285 286 status = acpi_walk_resources(link->handle, METHOD_NAME__CRS, 287 acpi_pci_link_check_current, &irq); 288 if (ACPI_FAILURE(status)) { 289 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n")); 290 result = -ENODEV; 291 goto end; 292 } 293 294 if (acpi_strict && !irq) { 295 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n")); 296 result = -ENODEV; 297 } 298 299 link->irq.active = irq; 300 301 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); 302 303 end: 304 return_VALUE(result); 305 } 306 307 static int 308 acpi_pci_link_set ( 309 struct acpi_pci_link *link, 310 int irq) 311 { 312 int result = 0; 313 acpi_status status = AE_OK; 314 struct { 315 struct acpi_resource res; 316 struct acpi_resource end; 317 } *resource; 318 struct acpi_buffer buffer = {0, NULL}; 319 320 ACPI_FUNCTION_TRACE("acpi_pci_link_set"); 321 322 if (!link || !irq) 323 return_VALUE(-EINVAL); 324 325 resource = kmalloc( sizeof(*resource)+1, GFP_KERNEL); 326 if(!resource) 327 return_VALUE(-ENOMEM); 328 329 memset(resource, 0, sizeof(*resource)+1); 330 buffer.length = sizeof(*resource) +1; 331 buffer.pointer = resource; 332 333 switch(link->irq.resource_type) { 334 case ACPI_RSTYPE_IRQ: 335 resource->res.id = ACPI_RSTYPE_IRQ; 336 resource->res.length = sizeof(struct acpi_resource); 337 resource->res.data.irq.edge_level = link->irq.edge_level; 338 resource->res.data.irq.active_high_low = link->irq.active_high_low; 339 if (link->irq.edge_level == ACPI_EDGE_SENSITIVE) 340 resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE; 341 else 342 resource->res.data.irq.shared_exclusive = ACPI_SHARED; 343 resource->res.data.irq.number_of_interrupts = 1; 344 resource->res.data.irq.interrupts[0] = irq; 345 break; 346 347 case ACPI_RSTYPE_EXT_IRQ: 348 resource->res.id = ACPI_RSTYPE_EXT_IRQ; 349 resource->res.length = sizeof(struct acpi_resource); 350 resource->res.data.extended_irq.producer_consumer = ACPI_CONSUMER; 351 resource->res.data.extended_irq.edge_level = link->irq.edge_level; 352 resource->res.data.extended_irq.active_high_low = link->irq.active_high_low; 353 if (link->irq.edge_level == ACPI_EDGE_SENSITIVE) 354 resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE; 355 else 356 resource->res.data.irq.shared_exclusive = ACPI_SHARED; 357 resource->res.data.extended_irq.number_of_interrupts = 1; 358 resource->res.data.extended_irq.interrupts[0] = irq; 359 /* ignore resource_source, it's optional */ 360 break; 361 default: 362 printk("ACPI BUG: resource_type %d\n", link->irq.resource_type); 363 result = -EINVAL; 364 goto end; 365 366 } 367 resource->end.id = ACPI_RSTYPE_END_TAG; 368 369 /* Attempt to set the resource */ 370 status = acpi_set_current_resources(link->handle, &buffer); 371 372 /* check for total failure */ 373 if (ACPI_FAILURE(status)) { 374 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n")); 375 result = -ENODEV; 376 goto end; 377 } 378 379 /* Query _STA, set device->status */ 380 result = acpi_bus_get_status(link->device); 381 if (result) { 382 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n")); 383 goto end; 384 } 385 if (!link->device->status.enabled) { 386 printk(KERN_WARNING PREFIX 387 "%s [%s] disabled and referenced, BIOS bug.\n", 388 acpi_device_name(link->device), 389 acpi_device_bid(link->device)); 390 } 391 392 /* Query _CRS, set link->irq.active */ 393 result = acpi_pci_link_get_current(link); 394 if (result) { 395 goto end; 396 } 397 398 /* 399 * Is current setting not what we set? 400 * set link->irq.active 401 */ 402 if (link->irq.active != irq) { 403 /* 404 * policy: when _CRS doesn't return what we just _SRS 405 * assume _SRS worked and override _CRS value. 406 */ 407 printk(KERN_WARNING PREFIX 408 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", 409 acpi_device_name(link->device), 410 acpi_device_bid(link->device), 411 link->irq.active, irq); 412 link->irq.active = irq; 413 } 414 415 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); 416 417 end: 418 kfree(resource); 419 return_VALUE(result); 420 } 421 422 423 /* -------------------------------------------------------------------------- 424 PCI Link IRQ Management 425 -------------------------------------------------------------------------- */ 426 427 /* 428 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt 429 * Link Devices to move the PIRQs around to minimize sharing. 430 * 431 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs 432 * that the BIOS has already set to active. This is necessary because 433 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that 434 * if the BIOS doesn't set a Link Device active, ACPI needs to program it 435 * even if acpi_irq_nobalance is set. 436 * 437 * A tables of penalties avoids directing PCI interrupts to well known 438 * ISA IRQs. Boot params are available to over-ride the default table: 439 * 440 * List interrupts that are free for PCI use. 441 * acpi_irq_pci=n[,m] 442 * 443 * List interrupts that should not be used for PCI: 444 * acpi_irq_isa=n[,m] 445 * 446 * Note that PCI IRQ routers have a list of possible IRQs, 447 * which may not include the IRQs this table says are available. 448 * 449 * Since this heuristic can't tell the difference between a link 450 * that no device will attach to, vs. a link which may be shared 451 * by multiple active devices -- it is not optimal. 452 * 453 * If interrupt performance is that important, get an IO-APIC system 454 * with a pin dedicated to each device. Or for that matter, an MSI 455 * enabled system. 456 */ 457 458 #define ACPI_MAX_IRQS 256 459 #define ACPI_MAX_ISA_IRQ 16 460 461 #define PIRQ_PENALTY_PCI_AVAILABLE (0) 462 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) 463 #define PIRQ_PENALTY_PCI_USING (16*16*16) 464 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) 465 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) 466 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) 467 468 static int acpi_irq_penalty[ACPI_MAX_IRQS] = { 469 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ 470 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ 471 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ 472 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ 473 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ 474 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ 475 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ 476 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ 477 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ 478 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ 479 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ 480 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ 481 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ 482 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ 483 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ 484 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ 485 /* >IRQ15 */ 486 }; 487 488 int __init 489 acpi_irq_penalty_init(void) 490 { 491 struct list_head *node = NULL; 492 struct acpi_pci_link *link = NULL; 493 int i = 0; 494 495 ACPI_FUNCTION_TRACE("acpi_irq_penalty_init"); 496 497 /* 498 * Update penalties to facilitate IRQ balancing. 499 */ 500 list_for_each(node, &acpi_link.entries) { 501 502 link = list_entry(node, struct acpi_pci_link, node); 503 if (!link) { 504 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); 505 continue; 506 } 507 508 /* 509 * reflect the possible and active irqs in the penalty table -- 510 * useful for breaking ties. 511 */ 512 if (link->irq.possible_count) { 513 int penalty = PIRQ_PENALTY_PCI_POSSIBLE / link->irq.possible_count; 514 515 for (i = 0; i < link->irq.possible_count; i++) { 516 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) 517 acpi_irq_penalty[link->irq.possible[i]] += penalty; 518 } 519 520 } else if (link->irq.active) { 521 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_POSSIBLE; 522 } 523 } 524 /* Add a penalty for the SCI */ 525 acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; 526 527 return_VALUE(0); 528 } 529 530 static int acpi_irq_balance; /* 0: static, 1: balance */ 531 532 static int acpi_pci_link_allocate( 533 struct acpi_pci_link *link) 534 { 535 int irq; 536 int i; 537 538 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate"); 539 540 if (link->irq.initialized) { 541 if (link->refcnt == 0) 542 /* This means the link is disabled but initialized */ 543 acpi_pci_link_set(link, link->irq.active); 544 return_VALUE(0); 545 } 546 547 /* 548 * search for active IRQ in list of possible IRQs. 549 */ 550 for (i = 0; i < link->irq.possible_count; ++i) { 551 if (link->irq.active == link->irq.possible[i]) 552 break; 553 } 554 /* 555 * forget active IRQ that is not in possible list 556 */ 557 if (i == link->irq.possible_count) { 558 if (acpi_strict) 559 printk(KERN_WARNING PREFIX "_CRS %d not found" 560 " in _PRS\n", link->irq.active); 561 link->irq.active = 0; 562 } 563 564 /* 565 * if active found, use it; else pick entry from end of possible list. 566 */ 567 if (link->irq.active) { 568 irq = link->irq.active; 569 } else { 570 irq = link->irq.possible[link->irq.possible_count - 1]; 571 } 572 573 if (acpi_irq_balance || !link->irq.active) { 574 /* 575 * Select the best IRQ. This is done in reverse to promote 576 * the use of IRQs 9, 10, 11, and >15. 577 */ 578 for (i = (link->irq.possible_count - 1); i >= 0; i--) { 579 if (acpi_irq_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]]) 580 irq = link->irq.possible[i]; 581 } 582 } 583 584 /* Attempt to enable the link device at this IRQ. */ 585 if (acpi_pci_link_set(link, irq)) { 586 printk(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n" 587 "Try pci=noacpi or acpi=off\n", 588 acpi_device_name(link->device), 589 acpi_device_bid(link->device)); 590 return_VALUE(-ENODEV); 591 } else { 592 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; 593 printk(PREFIX "%s [%s] enabled at IRQ %d\n", 594 acpi_device_name(link->device), 595 acpi_device_bid(link->device), link->irq.active); 596 } 597 598 link->irq.initialized = 1; 599 600 return_VALUE(0); 601 } 602 603 /* 604 * acpi_pci_link_allocate_irq 605 * success: return IRQ >= 0 606 * failure: return -1 607 */ 608 609 int 610 acpi_pci_link_allocate_irq ( 611 acpi_handle handle, 612 int index, 613 int *edge_level, 614 int *active_high_low, 615 char **name) 616 { 617 int result = 0; 618 struct acpi_device *device = NULL; 619 struct acpi_pci_link *link = NULL; 620 621 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq"); 622 623 result = acpi_bus_get_device(handle, &device); 624 if (result) { 625 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); 626 return_VALUE(-1); 627 } 628 629 link = (struct acpi_pci_link *) acpi_driver_data(device); 630 if (!link) { 631 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); 632 return_VALUE(-1); 633 } 634 635 /* TBD: Support multiple index (IRQ) entries per Link Device */ 636 if (index) { 637 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index)); 638 return_VALUE(-1); 639 } 640 641 down(&acpi_link_lock); 642 if (acpi_pci_link_allocate(link)) { 643 up(&acpi_link_lock); 644 return_VALUE(-1); 645 } 646 647 if (!link->irq.active) { 648 up(&acpi_link_lock); 649 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n")); 650 return_VALUE(-1); 651 } 652 link->refcnt ++; 653 up(&acpi_link_lock); 654 655 if (edge_level) *edge_level = link->irq.edge_level; 656 if (active_high_low) *active_high_low = link->irq.active_high_low; 657 if (name) *name = acpi_device_bid(link->device); 658 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 659 "Link %s is referenced\n", acpi_device_bid(link->device))); 660 return_VALUE(link->irq.active); 661 } 662 663 /* 664 * We don't change link's irq information here. After it is reenabled, we 665 * continue use the info 666 */ 667 int 668 acpi_pci_link_free_irq(acpi_handle handle) 669 { 670 struct acpi_device *device = NULL; 671 struct acpi_pci_link *link = NULL; 672 acpi_status result; 673 674 ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq"); 675 676 result = acpi_bus_get_device(handle, &device); 677 if (result) { 678 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); 679 return_VALUE(-1); 680 } 681 682 link = (struct acpi_pci_link *) acpi_driver_data(device); 683 if (!link) { 684 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); 685 return_VALUE(-1); 686 } 687 688 down(&acpi_link_lock); 689 if (!link->irq.initialized) { 690 up(&acpi_link_lock); 691 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n")); 692 return_VALUE(-1); 693 } 694 695 #ifdef FUTURE_USE 696 /* 697 * The Link reference count allows us to _DISable an unused link 698 * and suspend time, and set it again on resume. 699 * However, 2.6.12 still has irq_router.resume 700 * which blindly restores the link state. 701 * So we disable the reference count method 702 * to prevent duplicate acpi_pci_link_set() 703 * which would harm some systems 704 */ 705 link->refcnt --; 706 #endif 707 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 708 "Link %s is dereferenced\n", acpi_device_bid(link->device))); 709 710 if (link->refcnt == 0) { 711 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); 712 } 713 up(&acpi_link_lock); 714 return_VALUE(link->irq.active); 715 } 716 /* -------------------------------------------------------------------------- 717 Driver Interface 718 -------------------------------------------------------------------------- */ 719 720 static int 721 acpi_pci_link_add ( 722 struct acpi_device *device) 723 { 724 int result = 0; 725 struct acpi_pci_link *link = NULL; 726 int i = 0; 727 int found = 0; 728 729 ACPI_FUNCTION_TRACE("acpi_pci_link_add"); 730 731 if (!device) 732 return_VALUE(-EINVAL); 733 734 link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); 735 if (!link) 736 return_VALUE(-ENOMEM); 737 memset(link, 0, sizeof(struct acpi_pci_link)); 738 739 link->device = device; 740 link->handle = device->handle; 741 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); 742 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); 743 acpi_driver_data(device) = link; 744 745 down(&acpi_link_lock); 746 result = acpi_pci_link_get_possible(link); 747 if (result) 748 goto end; 749 750 /* query and set link->irq.active */ 751 acpi_pci_link_get_current(link); 752 753 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), 754 acpi_device_bid(device)); 755 for (i = 0; i < link->irq.possible_count; i++) { 756 if (link->irq.active == link->irq.possible[i]) { 757 printk(" *%d", link->irq.possible[i]); 758 found = 1; 759 } 760 else 761 printk(" %d", link->irq.possible[i]); 762 } 763 764 printk(")"); 765 766 if (!found) 767 printk(" *%d", link->irq.active); 768 769 if(!link->device->status.enabled) 770 printk(", disabled."); 771 772 printk("\n"); 773 774 /* TBD: Acquire/release lock */ 775 list_add_tail(&link->node, &acpi_link.entries); 776 acpi_link.count++; 777 778 end: 779 /* disable all links -- to be activated on use */ 780 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); 781 up(&acpi_link_lock); 782 783 if (result) 784 kfree(link); 785 786 return_VALUE(result); 787 } 788 789 static int irqrouter_suspend(struct sys_device *dev, pm_message_t state) 790 { 791 struct list_head *node = NULL; 792 struct acpi_pci_link *link = NULL; 793 int ret = 0; 794 795 ACPI_FUNCTION_TRACE("irqrouter_suspend"); 796 797 list_for_each(node, &acpi_link.entries) { 798 link = list_entry(node, struct acpi_pci_link, node); 799 if (!link) { 800 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 801 "Invalid link context\n")); 802 continue; 803 } 804 if (link->irq.initialized && link->refcnt != 0 805 /* We ignore legacy IDE device irq */ 806 && link->irq.active != 14 && link->irq.active !=15) { 807 printk(KERN_WARNING PREFIX 808 "%d drivers with interrupt %d neglected to call" 809 " pci_disable_device at .suspend\n", 810 link->refcnt, 811 link->irq.active); 812 printk(KERN_WARNING PREFIX 813 "Fix the driver, or rmmod before suspend\n"); 814 link->refcnt = 0; 815 ret = -EINVAL; 816 } 817 } 818 return_VALUE(ret); 819 } 820 821 822 static int 823 acpi_pci_link_remove ( 824 struct acpi_device *device, 825 int type) 826 { 827 struct acpi_pci_link *link = NULL; 828 829 ACPI_FUNCTION_TRACE("acpi_pci_link_remove"); 830 831 if (!device || !acpi_driver_data(device)) 832 return_VALUE(-EINVAL); 833 834 link = (struct acpi_pci_link *) acpi_driver_data(device); 835 836 down(&acpi_link_lock); 837 list_del(&link->node); 838 up(&acpi_link_lock); 839 840 kfree(link); 841 842 return_VALUE(0); 843 } 844 845 /* 846 * modify acpi_irq_penalty[] from cmdline 847 */ 848 static int __init acpi_irq_penalty_update(char *str, int used) 849 { 850 int i; 851 852 for (i = 0; i < 16; i++) { 853 int retval; 854 int irq; 855 856 retval = get_option(&str,&irq); 857 858 if (!retval) 859 break; /* no number found */ 860 861 if (irq < 0) 862 continue; 863 864 if (irq >= ACPI_MAX_IRQS) 865 continue; 866 867 if (used) 868 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; 869 else 870 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; 871 872 if (retval != 2) /* no next number */ 873 break; 874 } 875 return 1; 876 } 877 878 /* 879 * We'd like PNP to call this routine for the 880 * single ISA_USED value for each legacy device. 881 * But instead it calls us with each POSSIBLE setting. 882 * There is no ISA_POSSIBLE weight, so we simply use 883 * the (small) PCI_USING penalty. 884 */ 885 void acpi_penalize_isa_irq(int irq, int active) 886 { 887 if (active) 888 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; 889 else 890 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; 891 } 892 893 /* 894 * Over-ride default table to reserve additional IRQs for use by ISA 895 * e.g. acpi_irq_isa=5 896 * Useful for telling ACPI how not to interfere with your ISA sound card. 897 */ 898 static int __init acpi_irq_isa(char *str) 899 { 900 return acpi_irq_penalty_update(str, 1); 901 } 902 __setup("acpi_irq_isa=", acpi_irq_isa); 903 904 /* 905 * Over-ride default table to free additional IRQs for use by PCI 906 * e.g. acpi_irq_pci=7,15 907 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. 908 */ 909 static int __init acpi_irq_pci(char *str) 910 { 911 return acpi_irq_penalty_update(str, 0); 912 } 913 __setup("acpi_irq_pci=", acpi_irq_pci); 914 915 static int __init acpi_irq_nobalance_set(char *str) 916 { 917 acpi_irq_balance = 0; 918 return 1; 919 } 920 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); 921 922 int __init acpi_irq_balance_set(char *str) 923 { 924 acpi_irq_balance = 1; 925 return 1; 926 } 927 __setup("acpi_irq_balance", acpi_irq_balance_set); 928 929 930 /* FIXME: we will remove this interface after all drivers call pci_disable_device */ 931 static struct sysdev_class irqrouter_sysdev_class = { 932 set_kset_name("irqrouter"), 933 .suspend = irqrouter_suspend, 934 }; 935 936 937 static struct sys_device device_irqrouter = { 938 .id = 0, 939 .cls = &irqrouter_sysdev_class, 940 }; 941 942 943 static int __init irqrouter_init_sysfs(void) 944 { 945 int error; 946 947 ACPI_FUNCTION_TRACE("irqrouter_init_sysfs"); 948 949 if (acpi_disabled || acpi_noirq) 950 return_VALUE(0); 951 952 error = sysdev_class_register(&irqrouter_sysdev_class); 953 if (!error) 954 error = sysdev_register(&device_irqrouter); 955 956 return_VALUE(error); 957 } 958 959 device_initcall(irqrouter_init_sysfs); 960 961 962 static int __init acpi_pci_link_init (void) 963 { 964 ACPI_FUNCTION_TRACE("acpi_pci_link_init"); 965 966 if (acpi_noirq) 967 return_VALUE(0); 968 969 acpi_link.count = 0; 970 INIT_LIST_HEAD(&acpi_link.entries); 971 972 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) 973 return_VALUE(-ENODEV); 974 975 return_VALUE(0); 976 } 977 978 subsys_initcall(acpi_pci_link_init); 979