1 /* 2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem 3 * 4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) 5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) 6 * Copyright (C) 2002,2003 NEC Corporation 7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) 8 * Copyright (C) 2003-2005 Hewlett Packard 9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) 10 * Copyright (C) 2005 Intel Corporation 11 * 12 * All rights reserved. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or (at 17 * your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, but 20 * WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 22 * NON INFRINGEMENT. See the GNU General Public License for more 23 * details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 * Send feedback to <t-kochi@bq.jp.nec.com> 30 * 31 */ 32 33 /* 34 * Lifetime rules for pci_dev: 35 * - The one in acpiphp_func has its refcount elevated by pci_get_slot() 36 * when the driver is loaded or when an insertion event occurs. It loses 37 * a refcount when its ejected or the driver unloads. 38 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() 39 * when the bridge is scanned and it loses a refcount when the bridge 40 * is removed. 41 */ 42 43 #include <linux/init.h> 44 #include <linux/module.h> 45 46 #include <linux/kernel.h> 47 #include <linux/pci.h> 48 #include <linux/smp_lock.h> 49 #include <asm/semaphore.h> 50 51 #include "../pci.h" 52 #include "pci_hotplug.h" 53 #include "acpiphp.h" 54 55 static LIST_HEAD(bridge_list); 56 57 #define MY_NAME "acpiphp_glue" 58 59 static void handle_hotplug_event_bridge (acpi_handle, u32, void *); 60 static void handle_hotplug_event_func (acpi_handle, u32, void *); 61 62 /* 63 * initialization & terminatation routines 64 */ 65 66 /** 67 * is_ejectable - determine if a slot is ejectable 68 * @handle: handle to acpi namespace 69 * 70 * Ejectable slot should satisfy at least these conditions: 71 * 72 * 1. has _ADR method 73 * 2. has _EJ0 method 74 * 75 * optionally 76 * 77 * 1. has _STA method 78 * 2. has _PS0 method 79 * 3. has _PS3 method 80 * 4. .. 81 * 82 */ 83 static int is_ejectable(acpi_handle handle) 84 { 85 acpi_status status; 86 acpi_handle tmp; 87 88 status = acpi_get_handle(handle, "_ADR", &tmp); 89 if (ACPI_FAILURE(status)) { 90 return 0; 91 } 92 93 status = acpi_get_handle(handle, "_EJ0", &tmp); 94 if (ACPI_FAILURE(status)) { 95 return 0; 96 } 97 98 return 1; 99 } 100 101 102 /* callback routine to check the existence of ejectable slots */ 103 static acpi_status 104 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 105 { 106 int *count = (int *)context; 107 108 if (is_ejectable(handle)) { 109 (*count)++; 110 /* only one ejectable slot is enough */ 111 return AE_CTRL_TERMINATE; 112 } else { 113 return AE_OK; 114 } 115 } 116 117 118 /* callback routine to register each ACPI PCI slot object */ 119 static acpi_status 120 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) 121 { 122 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; 123 struct acpiphp_slot *slot; 124 struct acpiphp_func *newfunc; 125 acpi_handle tmp; 126 acpi_status status = AE_OK; 127 unsigned long adr, sun; 128 int device, function; 129 static int num_slots = 0; /* XXX if we support I/O node hotplug... */ 130 131 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 132 133 if (ACPI_FAILURE(status)) 134 return AE_OK; 135 136 status = acpi_get_handle(handle, "_EJ0", &tmp); 137 138 if (ACPI_FAILURE(status)) 139 return AE_OK; 140 141 device = (adr >> 16) & 0xffff; 142 function = adr & 0xffff; 143 144 newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL); 145 if (!newfunc) 146 return AE_NO_MEMORY; 147 memset(newfunc, 0, sizeof(struct acpiphp_func)); 148 149 INIT_LIST_HEAD(&newfunc->sibling); 150 newfunc->handle = handle; 151 newfunc->function = function; 152 newfunc->flags = FUNC_HAS_EJ0; 153 154 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) 155 newfunc->flags |= FUNC_HAS_STA; 156 157 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) 158 newfunc->flags |= FUNC_HAS_PS0; 159 160 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) 161 newfunc->flags |= FUNC_HAS_PS3; 162 163 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 164 if (ACPI_FAILURE(status)) 165 sun = -1; 166 167 /* search for objects that share the same slot */ 168 for (slot = bridge->slots; slot; slot = slot->next) 169 if (slot->device == device) { 170 if (slot->sun != sun) 171 warn("sibling found, but _SUN doesn't match!\n"); 172 break; 173 } 174 175 if (!slot) { 176 slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 177 if (!slot) { 178 kfree(newfunc); 179 return AE_NO_MEMORY; 180 } 181 182 memset(slot, 0, sizeof(struct acpiphp_slot)); 183 slot->bridge = bridge; 184 slot->id = num_slots++; 185 slot->device = device; 186 slot->sun = sun; 187 INIT_LIST_HEAD(&slot->funcs); 188 init_MUTEX(&slot->crit_sect); 189 190 slot->next = bridge->slots; 191 bridge->slots = slot; 192 193 bridge->nr_slots++; 194 195 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n", 196 slot->sun, pci_domain_nr(bridge->pci_bus), 197 bridge->pci_bus->number, slot->device); 198 } 199 200 newfunc->slot = slot; 201 list_add_tail(&newfunc->sibling, &slot->funcs); 202 203 /* associate corresponding pci_dev */ 204 newfunc->pci_dev = pci_get_slot(bridge->pci_bus, 205 PCI_DEVFN(device, function)); 206 if (newfunc->pci_dev) { 207 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 208 } 209 210 /* install notify handler */ 211 status = acpi_install_notify_handler(handle, 212 ACPI_SYSTEM_NOTIFY, 213 handle_hotplug_event_func, 214 newfunc); 215 216 if (ACPI_FAILURE(status)) { 217 err("failed to register interrupt notify handler\n"); 218 return status; 219 } 220 221 return AE_OK; 222 } 223 224 225 /* see if it's worth looking at this bridge */ 226 static int detect_ejectable_slots(acpi_handle *bridge_handle) 227 { 228 acpi_status status; 229 int count; 230 231 count = 0; 232 233 /* only check slots defined directly below bridge object */ 234 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1, 235 is_ejectable_slot, (void *)&count, NULL); 236 237 return count; 238 } 239 240 241 /* decode ACPI 2.0 _HPP hot plug parameters */ 242 static void decode_hpp(struct acpiphp_bridge *bridge) 243 { 244 acpi_status status; 245 struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER, 246 .pointer = NULL}; 247 union acpi_object *package; 248 int i; 249 250 /* default numbers */ 251 bridge->hpp.cache_line_size = 0x10; 252 bridge->hpp.latency_timer = 0x40; 253 bridge->hpp.enable_SERR = 0; 254 bridge->hpp.enable_PERR = 0; 255 256 status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer); 257 258 if (ACPI_FAILURE(status)) { 259 dbg("_HPP evaluation failed\n"); 260 return; 261 } 262 263 package = (union acpi_object *) buffer.pointer; 264 265 if (!package || package->type != ACPI_TYPE_PACKAGE || 266 package->package.count != 4 || !package->package.elements) { 267 err("invalid _HPP object; ignoring\n"); 268 goto err_exit; 269 } 270 271 for (i = 0; i < 4; i++) { 272 if (package->package.elements[i].type != ACPI_TYPE_INTEGER) { 273 err("invalid _HPP parameter type; ignoring\n"); 274 goto err_exit; 275 } 276 } 277 278 bridge->hpp.cache_line_size = package->package.elements[0].integer.value; 279 bridge->hpp.latency_timer = package->package.elements[1].integer.value; 280 bridge->hpp.enable_SERR = package->package.elements[2].integer.value; 281 bridge->hpp.enable_PERR = package->package.elements[3].integer.value; 282 283 dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n", 284 bridge->hpp.cache_line_size, 285 bridge->hpp.latency_timer, 286 bridge->hpp.enable_SERR, 287 bridge->hpp.enable_PERR); 288 289 bridge->flags |= BRIDGE_HAS_HPP; 290 291 err_exit: 292 kfree(buffer.pointer); 293 } 294 295 296 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ 297 static void init_bridge_misc(struct acpiphp_bridge *bridge) 298 { 299 acpi_status status; 300 301 /* decode ACPI 2.0 _HPP (hot plug parameters) */ 302 decode_hpp(bridge); 303 304 /* register all slot objects under this bridge */ 305 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, 306 register_slot, bridge, NULL); 307 308 /* install notify handler */ 309 if (bridge->type != BRIDGE_TYPE_HOST) { 310 status = acpi_install_notify_handler(bridge->handle, 311 ACPI_SYSTEM_NOTIFY, 312 handle_hotplug_event_bridge, 313 bridge); 314 315 if (ACPI_FAILURE(status)) { 316 err("failed to register interrupt notify handler\n"); 317 } 318 } 319 320 list_add(&bridge->list, &bridge_list); 321 } 322 323 324 /* allocate and initialize host bridge data structure */ 325 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus) 326 { 327 struct acpiphp_bridge *bridge; 328 329 bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 330 if (bridge == NULL) 331 return; 332 333 memset(bridge, 0, sizeof(struct acpiphp_bridge)); 334 335 bridge->type = BRIDGE_TYPE_HOST; 336 bridge->handle = handle; 337 338 bridge->pci_bus = pci_bus; 339 340 spin_lock_init(&bridge->res_lock); 341 342 init_bridge_misc(bridge); 343 } 344 345 346 /* allocate and initialize PCI-to-PCI bridge data structure */ 347 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev) 348 { 349 struct acpiphp_bridge *bridge; 350 351 bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 352 if (bridge == NULL) { 353 err("out of memory\n"); 354 return; 355 } 356 357 memset(bridge, 0, sizeof(struct acpiphp_bridge)); 358 359 bridge->type = BRIDGE_TYPE_P2P; 360 bridge->handle = handle; 361 362 bridge->pci_dev = pci_dev_get(pci_dev); 363 bridge->pci_bus = pci_dev->subordinate; 364 if (!bridge->pci_bus) { 365 err("This is not a PCI-to-PCI bridge!\n"); 366 goto err; 367 } 368 369 spin_lock_init(&bridge->res_lock); 370 371 init_bridge_misc(bridge); 372 return; 373 err: 374 pci_dev_put(pci_dev); 375 kfree(bridge); 376 return; 377 } 378 379 380 /* callback routine to find P2P bridges */ 381 static acpi_status 382 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 383 { 384 acpi_status status; 385 acpi_handle dummy_handle; 386 unsigned long tmp; 387 int device, function; 388 struct pci_dev *dev; 389 struct pci_bus *pci_bus = context; 390 391 status = acpi_get_handle(handle, "_ADR", &dummy_handle); 392 if (ACPI_FAILURE(status)) 393 return AE_OK; /* continue */ 394 395 status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); 396 if (ACPI_FAILURE(status)) { 397 dbg("%s: _ADR evaluation failure\n", __FUNCTION__); 398 return AE_OK; 399 } 400 401 device = (tmp >> 16) & 0xffff; 402 function = tmp & 0xffff; 403 404 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); 405 406 if (!dev || !dev->subordinate) 407 goto out; 408 409 /* check if this bridge has ejectable slots */ 410 if (detect_ejectable_slots(handle) > 0) { 411 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); 412 add_p2p_bridge(handle, dev); 413 } 414 415 out: 416 pci_dev_put(dev); 417 return AE_OK; 418 } 419 420 421 /* find hot-pluggable slots, and then find P2P bridge */ 422 static int add_bridge(acpi_handle handle) 423 { 424 acpi_status status; 425 unsigned long tmp; 426 int seg, bus; 427 acpi_handle dummy_handle; 428 struct pci_bus *pci_bus; 429 430 /* if the bridge doesn't have _STA, we assume it is always there */ 431 status = acpi_get_handle(handle, "_STA", &dummy_handle); 432 if (ACPI_SUCCESS(status)) { 433 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); 434 if (ACPI_FAILURE(status)) { 435 dbg("%s: _STA evaluation failure\n", __FUNCTION__); 436 return 0; 437 } 438 if ((tmp & ACPI_STA_FUNCTIONING) == 0) 439 /* don't register this object */ 440 return 0; 441 } 442 443 /* get PCI segment number */ 444 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); 445 446 seg = ACPI_SUCCESS(status) ? tmp : 0; 447 448 /* get PCI bus number */ 449 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); 450 451 if (ACPI_SUCCESS(status)) { 452 bus = tmp; 453 } else { 454 warn("can't get bus number, assuming 0\n"); 455 bus = 0; 456 } 457 458 pci_bus = pci_find_bus(seg, bus); 459 if (!pci_bus) { 460 err("Can't find bus %04x:%02x\n", seg, bus); 461 return 0; 462 } 463 464 /* check if this bridge has ejectable slots */ 465 if (detect_ejectable_slots(handle) > 0) { 466 dbg("found PCI host-bus bridge with hot-pluggable slots\n"); 467 add_host_bridge(handle, pci_bus); 468 return 0; 469 } 470 471 /* search P2P bridges under this host bridge */ 472 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, 473 find_p2p_bridge, pci_bus, NULL); 474 475 if (ACPI_FAILURE(status)) 476 warn("find_p2p_bridge faied (error code = 0x%x)\n",status); 477 478 return 0; 479 } 480 481 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 482 { 483 struct list_head *head; 484 list_for_each(head, &bridge_list) { 485 struct acpiphp_bridge *bridge = list_entry(head, 486 struct acpiphp_bridge, list); 487 if (bridge->handle == handle) 488 return bridge; 489 } 490 491 return NULL; 492 } 493 494 static void cleanup_bridge(struct acpiphp_bridge *bridge) 495 { 496 struct list_head *list, *tmp; 497 struct acpiphp_slot *slot; 498 acpi_status status; 499 acpi_handle handle = bridge->handle; 500 501 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 502 handle_hotplug_event_bridge); 503 if (ACPI_FAILURE(status)) 504 err("failed to remove notify handler\n"); 505 506 slot = bridge->slots; 507 while (slot) { 508 struct acpiphp_slot *next = slot->next; 509 list_for_each_safe (list, tmp, &slot->funcs) { 510 struct acpiphp_func *func; 511 func = list_entry(list, struct acpiphp_func, sibling); 512 status = acpi_remove_notify_handler(func->handle, 513 ACPI_SYSTEM_NOTIFY, 514 handle_hotplug_event_func); 515 if (ACPI_FAILURE(status)) 516 err("failed to remove notify handler\n"); 517 pci_dev_put(func->pci_dev); 518 list_del(list); 519 kfree(func); 520 } 521 kfree(slot); 522 slot = next; 523 } 524 525 pci_dev_put(bridge->pci_dev); 526 list_del(&bridge->list); 527 kfree(bridge); 528 } 529 530 static acpi_status 531 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) 532 { 533 struct acpiphp_bridge *bridge; 534 535 if (!(bridge = acpiphp_handle_to_bridge(handle))) 536 return AE_OK; 537 cleanup_bridge(bridge); 538 return AE_OK; 539 } 540 541 static void remove_bridge(acpi_handle handle) 542 { 543 struct acpiphp_bridge *bridge; 544 545 bridge = acpiphp_handle_to_bridge(handle); 546 if (bridge) { 547 cleanup_bridge(bridge); 548 } else { 549 /* clean-up p2p bridges under this host bridge */ 550 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 551 (u32)1, cleanup_p2p_bridge, NULL, NULL); 552 } 553 } 554 555 static struct pci_dev * get_apic_pci_info(acpi_handle handle) 556 { 557 struct acpi_pci_id id; 558 struct pci_bus *bus; 559 struct pci_dev *dev; 560 561 if (ACPI_FAILURE(acpi_get_pci_id(handle, &id))) 562 return NULL; 563 564 bus = pci_find_bus(id.segment, id.bus); 565 if (!bus) 566 return NULL; 567 568 dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function)); 569 if (!dev) 570 return NULL; 571 572 if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) && 573 (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC)) 574 { 575 pci_dev_put(dev); 576 return NULL; 577 } 578 579 return dev; 580 } 581 582 static int get_gsi_base(acpi_handle handle, u32 *gsi_base) 583 { 584 acpi_status status; 585 int result = -1; 586 unsigned long gsb; 587 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 588 union acpi_object *obj; 589 void *table; 590 591 status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); 592 if (ACPI_SUCCESS(status)) { 593 *gsi_base = (u32)gsb; 594 return 0; 595 } 596 597 status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer); 598 if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer) 599 return -1; 600 601 obj = buffer.pointer; 602 if (obj->type != ACPI_TYPE_BUFFER) 603 goto out; 604 605 table = obj->buffer.pointer; 606 switch (((acpi_table_entry_header *)table)->type) { 607 case ACPI_MADT_IOSAPIC: 608 *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base; 609 result = 0; 610 break; 611 case ACPI_MADT_IOAPIC: 612 *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base; 613 result = 0; 614 break; 615 default: 616 break; 617 } 618 out: 619 acpi_os_free(buffer.pointer); 620 return result; 621 } 622 623 static acpi_status 624 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv) 625 { 626 acpi_status status; 627 unsigned long sta; 628 acpi_handle tmp; 629 struct pci_dev *pdev; 630 u32 gsi_base; 631 u64 phys_addr; 632 633 /* Evaluate _STA if present */ 634 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 635 if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) 636 return AE_CTRL_DEPTH; 637 638 /* Scan only PCI bus scope */ 639 status = acpi_get_handle(handle, "_HID", &tmp); 640 if (ACPI_SUCCESS(status)) 641 return AE_CTRL_DEPTH; 642 643 if (get_gsi_base(handle, &gsi_base)) 644 return AE_OK; 645 646 pdev = get_apic_pci_info(handle); 647 if (!pdev) 648 return AE_OK; 649 650 if (pci_enable_device(pdev)) { 651 pci_dev_put(pdev); 652 return AE_OK; 653 } 654 655 pci_set_master(pdev); 656 657 if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) { 658 pci_disable_device(pdev); 659 pci_dev_put(pdev); 660 return AE_OK; 661 } 662 663 phys_addr = pci_resource_start(pdev, 0); 664 if (acpi_register_ioapic(handle, phys_addr, gsi_base)) { 665 pci_release_region(pdev, 0); 666 pci_disable_device(pdev); 667 pci_dev_put(pdev); 668 return AE_OK; 669 } 670 671 return AE_OK; 672 } 673 674 static int acpiphp_configure_ioapics(acpi_handle handle) 675 { 676 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 677 ACPI_UINT32_MAX, ioapic_add, NULL, NULL); 678 return 0; 679 } 680 681 static int power_on_slot(struct acpiphp_slot *slot) 682 { 683 acpi_status status; 684 struct acpiphp_func *func; 685 struct list_head *l; 686 int retval = 0; 687 688 /* if already enabled, just skip */ 689 if (slot->flags & SLOT_POWEREDON) 690 goto err_exit; 691 692 list_for_each (l, &slot->funcs) { 693 func = list_entry(l, struct acpiphp_func, sibling); 694 695 if (func->flags & FUNC_HAS_PS0) { 696 dbg("%s: executing _PS0\n", __FUNCTION__); 697 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); 698 if (ACPI_FAILURE(status)) { 699 warn("%s: _PS0 failed\n", __FUNCTION__); 700 retval = -1; 701 goto err_exit; 702 } else 703 break; 704 } 705 } 706 707 /* TBD: evaluate _STA to check if the slot is enabled */ 708 709 slot->flags |= SLOT_POWEREDON; 710 711 err_exit: 712 return retval; 713 } 714 715 716 static int power_off_slot(struct acpiphp_slot *slot) 717 { 718 acpi_status status; 719 struct acpiphp_func *func; 720 struct list_head *l; 721 722 int retval = 0; 723 724 /* if already disabled, just skip */ 725 if ((slot->flags & SLOT_POWEREDON) == 0) 726 goto err_exit; 727 728 list_for_each (l, &slot->funcs) { 729 func = list_entry(l, struct acpiphp_func, sibling); 730 731 if (func->flags & FUNC_HAS_PS3) { 732 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); 733 if (ACPI_FAILURE(status)) { 734 warn("%s: _PS3 failed\n", __FUNCTION__); 735 retval = -1; 736 goto err_exit; 737 } else 738 break; 739 } 740 } 741 742 /* TBD: evaluate _STA to check if the slot is disabled */ 743 744 slot->flags &= (~SLOT_POWEREDON); 745 746 err_exit: 747 return retval; 748 } 749 750 751 /** 752 * enable_device - enable, configure a slot 753 * @slot: slot to be enabled 754 * 755 * This function should be called per *physical slot*, 756 * not per each slot object in ACPI namespace. 757 * 758 */ 759 static int enable_device(struct acpiphp_slot *slot) 760 { 761 struct pci_dev *dev; 762 struct pci_bus *bus = slot->bridge->pci_bus; 763 struct list_head *l; 764 struct acpiphp_func *func; 765 int retval = 0; 766 int num, max, pass; 767 768 if (slot->flags & SLOT_ENABLED) 769 goto err_exit; 770 771 /* sanity check: dev should be NULL when hot-plugged in */ 772 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); 773 if (dev) { 774 /* This case shouldn't happen */ 775 err("pci_dev structure already exists.\n"); 776 pci_dev_put(dev); 777 retval = -1; 778 goto err_exit; 779 } 780 781 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 782 if (num == 0) { 783 err("No new device found\n"); 784 retval = -1; 785 goto err_exit; 786 } 787 788 max = bus->secondary; 789 for (pass = 0; pass < 2; pass++) { 790 list_for_each_entry(dev, &bus->devices, bus_list) { 791 if (PCI_SLOT(dev->devfn) != slot->device) 792 continue; 793 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 794 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 795 max = pci_scan_bridge(bus, dev, max, pass); 796 } 797 } 798 799 pci_bus_assign_resources(bus); 800 pci_bus_add_devices(bus); 801 802 /* associate pci_dev to our representation */ 803 list_for_each (l, &slot->funcs) { 804 func = list_entry(l, struct acpiphp_func, sibling); 805 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 806 func->function)); 807 } 808 809 slot->flags |= SLOT_ENABLED; 810 811 err_exit: 812 return retval; 813 } 814 815 816 /** 817 * disable_device - disable a slot 818 */ 819 static int disable_device(struct acpiphp_slot *slot) 820 { 821 int retval = 0; 822 struct acpiphp_func *func; 823 struct list_head *l; 824 825 /* is this slot already disabled? */ 826 if (!(slot->flags & SLOT_ENABLED)) 827 goto err_exit; 828 829 list_for_each (l, &slot->funcs) { 830 func = list_entry(l, struct acpiphp_func, sibling); 831 if (!func->pci_dev) 832 continue; 833 834 pci_remove_bus_device(func->pci_dev); 835 pci_dev_put(func->pci_dev); 836 func->pci_dev = NULL; 837 } 838 839 slot->flags &= (~SLOT_ENABLED); 840 841 err_exit: 842 return retval; 843 } 844 845 846 /** 847 * get_slot_status - get ACPI slot status 848 * 849 * if a slot has _STA for each function and if any one of them 850 * returned non-zero status, return it 851 * 852 * if a slot doesn't have _STA and if any one of its functions' 853 * configuration space is configured, return 0x0f as a _STA 854 * 855 * otherwise return 0 856 */ 857 static unsigned int get_slot_status(struct acpiphp_slot *slot) 858 { 859 acpi_status status; 860 unsigned long sta = 0; 861 u32 dvid; 862 struct list_head *l; 863 struct acpiphp_func *func; 864 865 list_for_each (l, &slot->funcs) { 866 func = list_entry(l, struct acpiphp_func, sibling); 867 868 if (func->flags & FUNC_HAS_STA) { 869 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); 870 if (ACPI_SUCCESS(status) && sta) 871 break; 872 } else { 873 pci_bus_read_config_dword(slot->bridge->pci_bus, 874 PCI_DEVFN(slot->device, 875 func->function), 876 PCI_VENDOR_ID, &dvid); 877 if (dvid != 0xffffffff) { 878 sta = ACPI_STA_ALL; 879 break; 880 } 881 } 882 } 883 884 return (unsigned int)sta; 885 } 886 887 /** 888 * acpiphp_eject_slot - physically eject the slot 889 */ 890 static int acpiphp_eject_slot(struct acpiphp_slot *slot) 891 { 892 acpi_status status; 893 struct acpiphp_func *func; 894 struct list_head *l; 895 struct acpi_object_list arg_list; 896 union acpi_object arg; 897 898 list_for_each (l, &slot->funcs) { 899 func = list_entry(l, struct acpiphp_func, sibling); 900 901 /* We don't want to call _EJ0 on non-existing functions. */ 902 if ((func->flags & FUNC_HAS_EJ0)) { 903 /* _EJ0 method take one argument */ 904 arg_list.count = 1; 905 arg_list.pointer = &arg; 906 arg.type = ACPI_TYPE_INTEGER; 907 arg.integer.value = 1; 908 909 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); 910 if (ACPI_FAILURE(status)) { 911 warn("%s: _EJ0 failed\n", __FUNCTION__); 912 return -1; 913 } else 914 break; 915 } 916 } 917 return 0; 918 } 919 920 /** 921 * acpiphp_check_bridge - re-enumerate devices 922 * 923 * Iterate over all slots under this bridge and make sure that if a 924 * card is present they are enabled, and if not they are disabled. 925 */ 926 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) 927 { 928 struct acpiphp_slot *slot; 929 int retval = 0; 930 int enabled, disabled; 931 932 enabled = disabled = 0; 933 934 for (slot = bridge->slots; slot; slot = slot->next) { 935 unsigned int status = get_slot_status(slot); 936 if (slot->flags & SLOT_ENABLED) { 937 if (status == ACPI_STA_ALL) 938 continue; 939 retval = acpiphp_disable_slot(slot); 940 if (retval) { 941 err("Error occurred in disabling\n"); 942 goto err_exit; 943 } else { 944 acpiphp_eject_slot(slot); 945 } 946 disabled++; 947 } else { 948 if (status != ACPI_STA_ALL) 949 continue; 950 retval = acpiphp_enable_slot(slot); 951 if (retval) { 952 err("Error occurred in enabling\n"); 953 goto err_exit; 954 } 955 enabled++; 956 } 957 } 958 959 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled); 960 961 err_exit: 962 return retval; 963 } 964 965 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) 966 { 967 u16 pci_cmd, pci_bctl; 968 struct pci_dev *cdev; 969 970 /* Program hpp values for this device */ 971 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || 972 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && 973 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) 974 return; 975 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 976 bridge->hpp.cache_line_size); 977 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 978 bridge->hpp.latency_timer); 979 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); 980 if (bridge->hpp.enable_SERR) 981 pci_cmd |= PCI_COMMAND_SERR; 982 else 983 pci_cmd &= ~PCI_COMMAND_SERR; 984 if (bridge->hpp.enable_PERR) 985 pci_cmd |= PCI_COMMAND_PARITY; 986 else 987 pci_cmd &= ~PCI_COMMAND_PARITY; 988 pci_write_config_word(dev, PCI_COMMAND, pci_cmd); 989 990 /* Program bridge control value and child devices */ 991 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { 992 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 993 bridge->hpp.latency_timer); 994 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); 995 if (bridge->hpp.enable_SERR) 996 pci_bctl |= PCI_BRIDGE_CTL_SERR; 997 else 998 pci_bctl &= ~PCI_BRIDGE_CTL_SERR; 999 if (bridge->hpp.enable_PERR) 1000 pci_bctl |= PCI_BRIDGE_CTL_PARITY; 1001 else 1002 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; 1003 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); 1004 if (dev->subordinate) { 1005 list_for_each_entry(cdev, &dev->subordinate->devices, 1006 bus_list) 1007 program_hpp(cdev, bridge); 1008 } 1009 } 1010 } 1011 1012 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus) 1013 { 1014 struct acpiphp_bridge bridge; 1015 struct pci_dev *dev; 1016 1017 memset(&bridge, 0, sizeof(bridge)); 1018 bridge.handle = handle; 1019 decode_hpp(&bridge); 1020 list_for_each_entry(dev, &bus->devices, bus_list) 1021 program_hpp(dev, &bridge); 1022 1023 } 1024 1025 /* 1026 * Remove devices for which we could not assign resources, call 1027 * arch specific code to fix-up the bus 1028 */ 1029 static void acpiphp_sanitize_bus(struct pci_bus *bus) 1030 { 1031 struct pci_dev *dev; 1032 int i; 1033 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 1034 1035 list_for_each_entry(dev, &bus->devices, bus_list) { 1036 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 1037 struct resource *res = &dev->resource[i]; 1038 if ((res->flags & type_mask) && !res->start && 1039 res->end) { 1040 /* Could not assign a required resources 1041 * for this device, remove it */ 1042 pci_remove_bus_device(dev); 1043 break; 1044 } 1045 } 1046 } 1047 } 1048 1049 /* Program resources in newly inserted bridge */ 1050 static int acpiphp_configure_bridge (acpi_handle handle) 1051 { 1052 struct acpi_pci_id pci_id; 1053 struct pci_bus *bus; 1054 1055 if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) { 1056 err("cannot get PCI domain and bus number for bridge\n"); 1057 return -EINVAL; 1058 } 1059 bus = pci_find_bus(pci_id.segment, pci_id.bus); 1060 if (!bus) { 1061 err("cannot find bus %d:%d\n", 1062 pci_id.segment, pci_id.bus); 1063 return -EINVAL; 1064 } 1065 1066 pci_bus_size_bridges(bus); 1067 pci_bus_assign_resources(bus); 1068 acpiphp_sanitize_bus(bus); 1069 acpiphp_set_hpp_values(handle, bus); 1070 pci_enable_bridges(bus); 1071 acpiphp_configure_ioapics(handle); 1072 return 0; 1073 } 1074 1075 static void handle_bridge_insertion(acpi_handle handle, u32 type) 1076 { 1077 struct acpi_device *device, *pdevice; 1078 acpi_handle phandle; 1079 1080 if ((type != ACPI_NOTIFY_BUS_CHECK) && 1081 (type != ACPI_NOTIFY_DEVICE_CHECK)) { 1082 err("unexpected notification type %d\n", type); 1083 return; 1084 } 1085 1086 acpi_get_parent(handle, &phandle); 1087 if (acpi_bus_get_device(phandle, &pdevice)) { 1088 dbg("no parent device, assuming NULL\n"); 1089 pdevice = NULL; 1090 } 1091 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { 1092 err("cannot add bridge to acpi list\n"); 1093 return; 1094 } 1095 if (!acpiphp_configure_bridge(handle) && 1096 !acpi_bus_start(device)) 1097 add_bridge(handle); 1098 else 1099 err("cannot configure and start bridge\n"); 1100 1101 } 1102 1103 /* 1104 * ACPI event handlers 1105 */ 1106 1107 /** 1108 * handle_hotplug_event_bridge - handle ACPI event on bridges 1109 * 1110 * @handle: Notify()'ed acpi_handle 1111 * @type: Notify code 1112 * @context: pointer to acpiphp_bridge structure 1113 * 1114 * handles ACPI event notification on {host,p2p} bridges 1115 * 1116 */ 1117 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) 1118 { 1119 struct acpiphp_bridge *bridge; 1120 char objname[64]; 1121 struct acpi_buffer buffer = { .length = sizeof(objname), 1122 .pointer = objname }; 1123 struct acpi_device *device; 1124 1125 if (acpi_bus_get_device(handle, &device)) { 1126 /* This bridge must have just been physically inserted */ 1127 handle_bridge_insertion(handle, type); 1128 return; 1129 } 1130 1131 bridge = acpiphp_handle_to_bridge(handle); 1132 if (!bridge) { 1133 err("cannot get bridge info\n"); 1134 return; 1135 } 1136 1137 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1138 1139 switch (type) { 1140 case ACPI_NOTIFY_BUS_CHECK: 1141 /* bus re-enumerate */ 1142 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1143 acpiphp_check_bridge(bridge); 1144 break; 1145 1146 case ACPI_NOTIFY_DEVICE_CHECK: 1147 /* device check */ 1148 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1149 acpiphp_check_bridge(bridge); 1150 break; 1151 1152 case ACPI_NOTIFY_DEVICE_WAKE: 1153 /* wake event */ 1154 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1155 break; 1156 1157 case ACPI_NOTIFY_EJECT_REQUEST: 1158 /* request device eject */ 1159 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1160 break; 1161 1162 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 1163 printk(KERN_ERR "Device %s cannot be configured due" 1164 " to a frequency mismatch\n", objname); 1165 break; 1166 1167 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 1168 printk(KERN_ERR "Device %s cannot be configured due" 1169 " to a bus mode mismatch\n", objname); 1170 break; 1171 1172 case ACPI_NOTIFY_POWER_FAULT: 1173 printk(KERN_ERR "Device %s has suffered a power fault\n", 1174 objname); 1175 break; 1176 1177 default: 1178 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1179 break; 1180 } 1181 } 1182 1183 /** 1184 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) 1185 * 1186 * @handle: Notify()'ed acpi_handle 1187 * @type: Notify code 1188 * @context: pointer to acpiphp_func structure 1189 * 1190 * handles ACPI event notification on slots 1191 * 1192 */ 1193 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) 1194 { 1195 struct acpiphp_func *func; 1196 char objname[64]; 1197 struct acpi_buffer buffer = { .length = sizeof(objname), 1198 .pointer = objname }; 1199 1200 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1201 1202 func = (struct acpiphp_func *)context; 1203 1204 switch (type) { 1205 case ACPI_NOTIFY_BUS_CHECK: 1206 /* bus re-enumerate */ 1207 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); 1208 acpiphp_enable_slot(func->slot); 1209 break; 1210 1211 case ACPI_NOTIFY_DEVICE_CHECK: 1212 /* device check : re-enumerate from parent bus */ 1213 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); 1214 acpiphp_check_bridge(func->slot->bridge); 1215 break; 1216 1217 case ACPI_NOTIFY_DEVICE_WAKE: 1218 /* wake event */ 1219 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); 1220 break; 1221 1222 case ACPI_NOTIFY_EJECT_REQUEST: 1223 /* request device eject */ 1224 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); 1225 if (!(acpiphp_disable_slot(func->slot))) 1226 acpiphp_eject_slot(func->slot); 1227 break; 1228 1229 default: 1230 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); 1231 break; 1232 } 1233 } 1234 1235 static int is_root_bridge(acpi_handle handle) 1236 { 1237 acpi_status status; 1238 struct acpi_device_info *info; 1239 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 1240 int i; 1241 1242 status = acpi_get_object_info(handle, &buffer); 1243 if (ACPI_SUCCESS(status)) { 1244 info = buffer.pointer; 1245 if ((info->valid & ACPI_VALID_HID) && 1246 !strcmp(PCI_ROOT_HID_STRING, 1247 info->hardware_id.value)) { 1248 acpi_os_free(buffer.pointer); 1249 return 1; 1250 } 1251 if (info->valid & ACPI_VALID_CID) { 1252 for (i=0; i < info->compatibility_id.count; i++) { 1253 if (!strcmp(PCI_ROOT_HID_STRING, 1254 info->compatibility_id.id[i].value)) { 1255 acpi_os_free(buffer.pointer); 1256 return 1; 1257 } 1258 } 1259 } 1260 } 1261 return 0; 1262 } 1263 1264 static acpi_status 1265 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) 1266 { 1267 int *count = (int *)context; 1268 1269 if (is_root_bridge(handle)) { 1270 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 1271 handle_hotplug_event_bridge, NULL); 1272 (*count)++; 1273 } 1274 return AE_OK ; 1275 } 1276 1277 static struct acpi_pci_driver acpi_pci_hp_driver = { 1278 .add = add_bridge, 1279 .remove = remove_bridge, 1280 }; 1281 1282 /** 1283 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures 1284 * 1285 */ 1286 int __init acpiphp_glue_init(void) 1287 { 1288 int num = 0; 1289 1290 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 1291 ACPI_UINT32_MAX, find_root_bridges, &num, NULL); 1292 1293 if (num <= 0) 1294 return -1; 1295 else 1296 acpi_pci_register_driver(&acpi_pci_hp_driver); 1297 1298 return 0; 1299 } 1300 1301 1302 /** 1303 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures 1304 * 1305 * This function frees all data allocated in acpiphp_glue_init() 1306 */ 1307 void __exit acpiphp_glue_exit(void) 1308 { 1309 acpi_pci_unregister_driver(&acpi_pci_hp_driver); 1310 } 1311 1312 1313 /** 1314 * acpiphp_get_num_slots - count number of slots in a system 1315 */ 1316 int __init acpiphp_get_num_slots(void) 1317 { 1318 struct list_head *node; 1319 struct acpiphp_bridge *bridge; 1320 int num_slots; 1321 1322 num_slots = 0; 1323 1324 list_for_each (node, &bridge_list) { 1325 bridge = (struct acpiphp_bridge *)node; 1326 dbg("Bus %04x:%02x has %d slot%s\n", 1327 pci_domain_nr(bridge->pci_bus), 1328 bridge->pci_bus->number, bridge->nr_slots, 1329 bridge->nr_slots == 1 ? "" : "s"); 1330 num_slots += bridge->nr_slots; 1331 } 1332 1333 dbg("Total %d slots\n", num_slots); 1334 return num_slots; 1335 } 1336 1337 1338 #if 0 1339 /** 1340 * acpiphp_for_each_slot - call function for each slot 1341 * @fn: callback function 1342 * @data: context to be passed to callback function 1343 * 1344 */ 1345 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) 1346 { 1347 struct list_head *node; 1348 struct acpiphp_bridge *bridge; 1349 struct acpiphp_slot *slot; 1350 int retval = 0; 1351 1352 list_for_each (node, &bridge_list) { 1353 bridge = (struct acpiphp_bridge *)node; 1354 for (slot = bridge->slots; slot; slot = slot->next) { 1355 retval = fn(slot, data); 1356 if (!retval) 1357 goto err_exit; 1358 } 1359 } 1360 1361 err_exit: 1362 return retval; 1363 } 1364 #endif 1365 1366 /* search matching slot from id */ 1367 struct acpiphp_slot *get_slot_from_id(int id) 1368 { 1369 struct list_head *node; 1370 struct acpiphp_bridge *bridge; 1371 struct acpiphp_slot *slot; 1372 1373 list_for_each (node, &bridge_list) { 1374 bridge = (struct acpiphp_bridge *)node; 1375 for (slot = bridge->slots; slot; slot = slot->next) 1376 if (slot->id == id) 1377 return slot; 1378 } 1379 1380 /* should never happen! */ 1381 err("%s: no object for id %d\n", __FUNCTION__, id); 1382 WARN_ON(1); 1383 return NULL; 1384 } 1385 1386 1387 /** 1388 * acpiphp_enable_slot - power on slot 1389 */ 1390 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1391 { 1392 int retval; 1393 1394 down(&slot->crit_sect); 1395 1396 /* wake up all functions */ 1397 retval = power_on_slot(slot); 1398 if (retval) 1399 goto err_exit; 1400 1401 if (get_slot_status(slot) == ACPI_STA_ALL) 1402 /* configure all functions */ 1403 retval = enable_device(slot); 1404 1405 err_exit: 1406 up(&slot->crit_sect); 1407 return retval; 1408 } 1409 1410 /** 1411 * acpiphp_disable_slot - power off slot 1412 */ 1413 int acpiphp_disable_slot(struct acpiphp_slot *slot) 1414 { 1415 int retval = 0; 1416 1417 down(&slot->crit_sect); 1418 1419 /* unconfigure all functions */ 1420 retval = disable_device(slot); 1421 if (retval) 1422 goto err_exit; 1423 1424 /* power off all functions */ 1425 retval = power_off_slot(slot); 1426 if (retval) 1427 goto err_exit; 1428 1429 err_exit: 1430 up(&slot->crit_sect); 1431 return retval; 1432 } 1433 1434 1435 /* 1436 * slot enabled: 1 1437 * slot disabled: 0 1438 */ 1439 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1440 { 1441 return (slot->flags & SLOT_POWEREDON); 1442 } 1443 1444 1445 /* 1446 * latch closed: 1 1447 * latch open: 0 1448 */ 1449 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1450 { 1451 unsigned int sta; 1452 1453 sta = get_slot_status(slot); 1454 1455 return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0; 1456 } 1457 1458 1459 /* 1460 * adapter presence : 1 1461 * absence : 0 1462 */ 1463 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1464 { 1465 unsigned int sta; 1466 1467 sta = get_slot_status(slot); 1468 1469 return (sta == 0) ? 0 : 1; 1470 } 1471 1472 1473 /* 1474 * pci address (seg/bus/dev) 1475 */ 1476 u32 acpiphp_get_address(struct acpiphp_slot *slot) 1477 { 1478 u32 address; 1479 struct pci_bus *pci_bus = slot->bridge->pci_bus; 1480 1481 address = (pci_domain_nr(pci_bus) << 16) | 1482 (pci_bus->number << 8) | 1483 slot->device; 1484 1485 return address; 1486 } 1487