git.oblomov.eu Git - linux-2.6/blob - drivers/pci/hotplug/acpiphp_glue.c

   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 <kristen.c.accardi@intel.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/pci_hotplug.h>
  49 #include <linux/mutex.h>
  50
  51 #include "../pci.h"
  52 #include "acpiphp.h"
  53
  54 static LIST_HEAD(bridge_list);
  55 static LIST_HEAD(ioapic_list);
  56 static DEFINE_SPINLOCK(ioapic_list_lock);
  57
  58 #define MY_NAME "acpiphp_glue"
  59
  60 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
  61 static void acpiphp_sanitize_bus(struct pci_bus *bus);
  62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
  63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
  64
  65
  66 /*
  67  * initialization & terminatation routines
  68  */
  69
  70 /**
  71  * is_ejectable - determine if a slot is ejectable
  72  * @handle: handle to acpi namespace
  73  *
  74  * Ejectable slot should satisfy at least these conditions:
  75  *
  76  *  1. has _ADR method
  77  *  2. has _EJ0 method
  78  *
  79  * optionally
  80  *
  81  *  1. has _STA method
  82  *  2. has _PS0 method
  83  *  3. has _PS3 method
  84  *  4. ..
  85  */
  86 static int is_ejectable(acpi_handle handle)
  87 {
  88         acpi_status status;
  89         acpi_handle tmp;
  90
  91         status = acpi_get_handle(handle, "_ADR", &tmp);
  92         if (ACPI_FAILURE(status)) {
  93                 return 0;
  94         }
  95
  96         status = acpi_get_handle(handle, "_EJ0", &tmp);
  97         if (ACPI_FAILURE(status)) {
  98                 return 0;
  99         }
 100
 101         return 1;
 102 }
 103
 104
 105 /* callback routine to check for the existence of ejectable slots */
 106 static acpi_status
 107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 108 {
 109         int *count = (int *)context;
 110
 111         if (is_ejectable(handle)) {
 112                 (*count)++;
 113                 /* only one ejectable slot is enough */
 114                 return AE_CTRL_TERMINATE;
 115         } else {
 116                 return AE_OK;
 117         }
 118 }
 119
 120 /* callback routine to check for the existence of a pci dock device */
 121 static acpi_status
 122 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 123 {
 124         int *count = (int *)context;
 125
 126         if (is_dock_device(handle)) {
 127                 (*count)++;
 128                 return AE_CTRL_TERMINATE;
 129         } else {
 130                 return AE_OK;
 131         }
 132 }
 133
 134
 135
 136
 137 /*
 138  * the _DCK method can do funny things... and sometimes not
 139  * hah-hah funny.
 140  *
 141  * TBD - figure out a way to only call fixups for
 142  * systems that require them.
 143  */
 144 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
 145         void *v)
 146 {
 147         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
 148         struct pci_bus *bus = func->slot->bridge->pci_bus;
 149         u32 buses;
 150
 151         if (!bus->self)
 152                 return  NOTIFY_OK;
 153
 154         /* fixup bad _DCK function that rewrites
 155          * secondary bridge on slot
 156          */
 157         pci_read_config_dword(bus->self,
 158                         PCI_PRIMARY_BUS,
 159                         &buses);
 160
 161         if (((buses >> 8) & 0xff) != bus->secondary) {
 162                 buses = (buses & 0xff000000)
 163                         | ((unsigned int)(bus->primary)     <<  0)
 164                         | ((unsigned int)(bus->secondary)   <<  8)
 165                         | ((unsigned int)(bus->subordinate) << 16);
 166                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
 167         }
 168         return NOTIFY_OK;
 169 }
 170
 171
 172
 173
 174 /* callback routine to register each ACPI PCI slot object */
 175 static acpi_status
 176 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 177 {
 178         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 179         struct acpiphp_slot *slot;
 180         struct acpiphp_func *newfunc;
 181         acpi_handle tmp;
 182         acpi_status status = AE_OK;
 183         unsigned long adr, sun;
 184         int device, function, retval;
 185
 186         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 187
 188         if (ACPI_FAILURE(status))
 189                 return AE_OK;
 190
 191         status = acpi_get_handle(handle, "_EJ0", &tmp);
 192
 193         if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
 194                 return AE_OK;
 195
 196         device = (adr >> 16) & 0xffff;
 197         function = adr & 0xffff;
 198
 199         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 200         if (!newfunc)
 201                 return AE_NO_MEMORY;
 202
 203         INIT_LIST_HEAD(&newfunc->sibling);
 204         newfunc->handle = handle;
 205         newfunc->function = function;
 206         if (ACPI_SUCCESS(status))
 207                 newfunc->flags = FUNC_HAS_EJ0;
 208
 209         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 210                 newfunc->flags |= FUNC_HAS_STA;
 211
 212         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 213                 newfunc->flags |= FUNC_HAS_PS0;
 214
 215         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 216                 newfunc->flags |= FUNC_HAS_PS3;
 217
 218         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 219                 newfunc->flags |= FUNC_HAS_DCK;
 220
 221         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 222         if (ACPI_FAILURE(status)) {
 223                 /*
 224                  * use the count of the number of slots we've found
 225                  * for the number of the slot
 226                  */
 227                 sun = bridge->nr_slots+1;
 228         }
 229
 230         /* search for objects that share the same slot */
 231         for (slot = bridge->slots; slot; slot = slot->next)
 232                 if (slot->device == device) {
 233                         if (slot->sun != sun)
 234                                 warn("sibling found, but _SUN doesn't match!\n");
 235                         break;
 236                 }
 237
 238         if (!slot) {
 239                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 240                 if (!slot) {
 241                         kfree(newfunc);
 242                         return AE_NO_MEMORY;
 243                 }
 244
 245                 slot->bridge = bridge;
 246                 slot->device = device;
 247                 slot->sun = sun;
 248                 INIT_LIST_HEAD(&slot->funcs);
 249                 mutex_init(&slot->crit_sect);
 250
 251                 slot->next = bridge->slots;
 252                 bridge->slots = slot;
 253
 254                 bridge->nr_slots++;
 255
 256                 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 257                                 slot->sun, pci_domain_nr(bridge->pci_bus),
 258                                 bridge->pci_bus->number, slot->device);
 259                 retval = acpiphp_register_hotplug_slot(slot);
 260                 if (retval) {
 261                         warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
 262                         goto err_exit;
 263                 }
 264         }
 265
 266         newfunc->slot = slot;
 267         list_add_tail(&newfunc->sibling, &slot->funcs);
 268
 269         /* associate corresponding pci_dev */
 270         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 271                                          PCI_DEVFN(device, function));
 272         if (newfunc->pci_dev) {
 273                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 274         }
 275
 276         if (is_dock_device(handle)) {
 277                 /* we don't want to call this device's _EJ0
 278                  * because we want the dock notify handler
 279                  * to call it after it calls _DCK
 280                  */
 281                 newfunc->flags &= ~FUNC_HAS_EJ0;
 282                 if (register_hotplug_dock_device(handle,
 283                         handle_hotplug_event_func, newfunc))
 284                         dbg("failed to register dock device\n");
 285
 286                 /* we need to be notified when dock events happen
 287                  * outside of the hotplug operation, since we may
 288                  * need to do fixups before we can hotplug.
 289                  */
 290                 newfunc->nb.notifier_call = post_dock_fixups;
 291                 if (register_dock_notifier(&newfunc->nb))
 292                         dbg("failed to register a dock notifier");
 293         }
 294
 295         /* install notify handler */
 296         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 297                 status = acpi_install_notify_handler(handle,
 298                                              ACPI_SYSTEM_NOTIFY,
 299                                              handle_hotplug_event_func,
 300                                              newfunc);
 301
 302                 if (ACPI_FAILURE(status))
 303                         err("failed to register interrupt notify handler\n");
 304         } else
 305                 status = AE_OK;
 306
 307         return status;
 308
 309  err_exit:
 310         bridge->nr_slots--;
 311         bridge->slots = slot->next;
 312         kfree(slot);
 313         kfree(newfunc);
 314
 315         return AE_OK;
 316 }
 317
 318
 319 /* see if it's worth looking at this bridge */
 320 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 321 {
 322         acpi_status status;
 323         int count;
 324
 325         count = 0;
 326
 327         /* only check slots defined directly below bridge object */
 328         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 329                                      is_ejectable_slot, (void *)&count, NULL);
 330
 331         /*
 332          * we also need to add this bridge if there is a dock bridge or
 333          * other pci device on a dock station (removable)
 334          */
 335         if (!count)
 336                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
 337                                 (u32)1, is_pci_dock_device, (void *)&count,
 338                                 NULL);
 339
 340         return count;
 341 }
 342
 343
 344 /* decode ACPI 2.0 _HPP hot plug parameters */
 345 static void decode_hpp(struct acpiphp_bridge *bridge)
 346 {
 347         acpi_status status;
 348
 349         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 350         if (ACPI_FAILURE(status) ||
 351             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 352                 /* use default numbers */
 353                 printk(KERN_WARNING
 354                        "%s: Could not get hotplug parameters. Use defaults\n",
 355                        __FUNCTION__);
 356                 bridge->hpp.t0 = &bridge->hpp.type0_data;
 357                 bridge->hpp.t0->revision = 0;
 358                 bridge->hpp.t0->cache_line_size = 0x10;
 359                 bridge->hpp.t0->latency_timer = 0x40;
 360                 bridge->hpp.t0->enable_serr = 0;
 361                 bridge->hpp.t0->enable_perr = 0;
 362         }
 363 }
 364
 365
 366
 367 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 368 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 369 {
 370         acpi_status status;
 371
 372         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 373         decode_hpp(bridge);
 374
 375         /* must be added to the list prior to calling register_slot */
 376         list_add(&bridge->list, &bridge_list);
 377
 378         /* register all slot objects under this bridge */
 379         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 380                                      register_slot, bridge, NULL);
 381         if (ACPI_FAILURE(status)) {
 382                 list_del(&bridge->list);
 383                 return;
 384         }
 385
 386         /* install notify handler */
 387         if (bridge->type != BRIDGE_TYPE_HOST) {
 388                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 389                         status = acpi_remove_notify_handler(bridge->func->handle,
 390                                                 ACPI_SYSTEM_NOTIFY,
 391                                                 handle_hotplug_event_func);
 392                         if (ACPI_FAILURE(status))
 393                                 err("failed to remove notify handler\n");
 394                 }
 395                 status = acpi_install_notify_handler(bridge->handle,
 396                                              ACPI_SYSTEM_NOTIFY,
 397                                              handle_hotplug_event_bridge,
 398                                              bridge);
 399
 400                 if (ACPI_FAILURE(status)) {
 401                         err("failed to register interrupt notify handler\n");
 402                 }
 403         }
 404 }
 405
 406
 407 /* find acpiphp_func from acpiphp_bridge */
 408 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 409 {
 410         struct list_head *node, *l;
 411         struct acpiphp_bridge *bridge;
 412         struct acpiphp_slot *slot;
 413         struct acpiphp_func *func;
 414
 415         list_for_each(node, &bridge_list) {
 416                 bridge = list_entry(node, struct acpiphp_bridge, list);
 417                 for (slot = bridge->slots; slot; slot = slot->next) {
 418                         list_for_each(l, &slot->funcs) {
 419                                 func = list_entry(l, struct acpiphp_func,
 420                                                         sibling);
 421                                 if (func->handle == handle)
 422                                         return func;
 423                         }
 424                 }
 425         }
 426
 427         return NULL;
 428 }
 429
 430
 431 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 432 {
 433         acpi_handle dummy_handle;
 434
 435         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 436                                         "_STA", &dummy_handle)))
 437                 bridge->flags |= BRIDGE_HAS_STA;
 438
 439         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 440                                         "_EJ0", &dummy_handle)))
 441                 bridge->flags |= BRIDGE_HAS_EJ0;
 442
 443         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 444                                         "_PS0", &dummy_handle)))
 445                 bridge->flags |= BRIDGE_HAS_PS0;
 446
 447         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 448                                         "_PS3", &dummy_handle)))
 449                 bridge->flags |= BRIDGE_HAS_PS3;
 450
 451         /* is this ejectable p2p bridge? */
 452         if (bridge->flags & BRIDGE_HAS_EJ0) {
 453                 struct acpiphp_func *func;
 454
 455                 dbg("found ejectable p2p bridge\n");
 456
 457                 /* make link between PCI bridge and PCI function */
 458                 func = acpiphp_bridge_handle_to_function(bridge->handle);
 459                 if (!func)
 460                         return;
 461                 bridge->func = func;
 462                 func->bridge = bridge;
 463         }
 464 }
 465
 466
 467 /* allocate and initialize host bridge data structure */
 468 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 469 {
 470         struct acpiphp_bridge *bridge;
 471
 472         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 473         if (bridge == NULL)
 474                 return;
 475
 476         bridge->type = BRIDGE_TYPE_HOST;
 477         bridge->handle = handle;
 478
 479         bridge->pci_bus = pci_bus;
 480
 481         spin_lock_init(&bridge->res_lock);
 482
 483         init_bridge_misc(bridge);
 484 }
 485
 486
 487 /* allocate and initialize PCI-to-PCI bridge data structure */
 488 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 489 {
 490         struct acpiphp_bridge *bridge;
 491
 492         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 493         if (bridge == NULL) {
 494                 err("out of memory\n");
 495                 return;
 496         }
 497
 498         bridge->type = BRIDGE_TYPE_P2P;
 499         bridge->handle = handle;
 500         config_p2p_bridge_flags(bridge);
 501
 502         bridge->pci_dev = pci_dev_get(pci_dev);
 503         bridge->pci_bus = pci_dev->subordinate;
 504         if (!bridge->pci_bus) {
 505                 err("This is not a PCI-to-PCI bridge!\n");
 506                 goto err;
 507         }
 508
 509         spin_lock_init(&bridge->res_lock);
 510
 511         init_bridge_misc(bridge);
 512         return;
 513  err:
 514         pci_dev_put(pci_dev);
 515         kfree(bridge);
 516         return;
 517 }
 518
 519
 520 /* callback routine to find P2P bridges */
 521 static acpi_status
 522 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 523 {
 524         acpi_status status;
 525         acpi_handle dummy_handle;
 526         unsigned long tmp;
 527         int device, function;
 528         struct pci_dev *dev;
 529         struct pci_bus *pci_bus = context;
 530
 531         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 532         if (ACPI_FAILURE(status))
 533                 return AE_OK;           /* continue */
 534
 535         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 536         if (ACPI_FAILURE(status)) {
 537                 dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
 538                 return AE_OK;
 539         }
 540
 541         device = (tmp >> 16) & 0xffff;
 542         function = tmp & 0xffff;
 543
 544         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 545
 546         if (!dev || !dev->subordinate)
 547                 goto out;
 548
 549         /* check if this bridge has ejectable slots */
 550         if ((detect_ejectable_slots(handle) > 0)) {
 551                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 552                 add_p2p_bridge(handle, dev);
 553         }
 554
 555         /* search P2P bridges under this p2p bridge */
 556         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 557                                      find_p2p_bridge, dev->subordinate, NULL);
 558         if (ACPI_FAILURE(status))
 559                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 560
 561  out:
 562         pci_dev_put(dev);
 563         return AE_OK;
 564 }
 565
 566
 567 /* find hot-pluggable slots, and then find P2P bridge */
 568 static int add_bridge(acpi_handle handle)
 569 {
 570         acpi_status status;
 571         unsigned long tmp;
 572         int seg, bus;
 573         acpi_handle dummy_handle;
 574         struct pci_bus *pci_bus;
 575
 576         /* if the bridge doesn't have _STA, we assume it is always there */
 577         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 578         if (ACPI_SUCCESS(status)) {
 579                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 580                 if (ACPI_FAILURE(status)) {
 581                         dbg("%s: _STA evaluation failure\n", __FUNCTION__);
 582                         return 0;
 583                 }
 584                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 585                         /* don't register this object */
 586                         return 0;
 587         }
 588
 589         /* get PCI segment number */
 590         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 591
 592         seg = ACPI_SUCCESS(status) ? tmp : 0;
 593
 594         /* get PCI bus number */
 595         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 596
 597         if (ACPI_SUCCESS(status)) {
 598                 bus = tmp;
 599         } else {
 600                 warn("can't get bus number, assuming 0\n");
 601                 bus = 0;
 602         }
 603
 604         pci_bus = pci_find_bus(seg, bus);
 605         if (!pci_bus) {
 606                 err("Can't find bus %04x:%02x\n", seg, bus);
 607                 return 0;
 608         }
 609
 610         /* check if this bridge has ejectable slots */
 611         if (detect_ejectable_slots(handle) > 0) {
 612                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 613                 add_host_bridge(handle, pci_bus);
 614         }
 615
 616         /* search P2P bridges under this host bridge */
 617         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 618                                      find_p2p_bridge, pci_bus, NULL);
 619
 620         if (ACPI_FAILURE(status))
 621                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 622
 623         return 0;
 624 }
 625
 626 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 627 {
 628         struct list_head *head;
 629         list_for_each(head, &bridge_list) {
 630                 struct acpiphp_bridge *bridge = list_entry(head,
 631                                                 struct acpiphp_bridge, list);
 632                 if (bridge->handle == handle)
 633                         return bridge;
 634         }
 635
 636         return NULL;
 637 }
 638
 639 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 640 {
 641         struct list_head *list, *tmp;
 642         struct acpiphp_slot *slot;
 643         acpi_status status;
 644         acpi_handle handle = bridge->handle;
 645
 646         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 647                                             handle_hotplug_event_bridge);
 648         if (ACPI_FAILURE(status))
 649                 err("failed to remove notify handler\n");
 650
 651         if ((bridge->type != BRIDGE_TYPE_HOST) &&
 652             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
 653                 status = acpi_install_notify_handler(bridge->func->handle,
 654                                                 ACPI_SYSTEM_NOTIFY,
 655                                                 handle_hotplug_event_func,
 656                                                 bridge->func);
 657                 if (ACPI_FAILURE(status))
 658                         err("failed to install interrupt notify handler\n");
 659         }
 660
 661         slot = bridge->slots;
 662         while (slot) {
 663                 struct acpiphp_slot *next = slot->next;
 664                 list_for_each_safe (list, tmp, &slot->funcs) {
 665                         struct acpiphp_func *func;
 666                         func = list_entry(list, struct acpiphp_func, sibling);
 667                         if (is_dock_device(func->handle)) {
 668                                 unregister_hotplug_dock_device(func->handle);
 669                                 unregister_dock_notifier(&func->nb);
 670                         }
 671                         if (!(func->flags & FUNC_HAS_DCK)) {
 672                                 status = acpi_remove_notify_handler(func->handle,
 673                                                 ACPI_SYSTEM_NOTIFY,
 674                                                 handle_hotplug_event_func);
 675                                 if (ACPI_FAILURE(status))
 676                                         err("failed to remove notify handler\n");
 677                         }
 678                         pci_dev_put(func->pci_dev);
 679                         list_del(list);
 680                         kfree(func);
 681                 }
 682                 acpiphp_unregister_hotplug_slot(slot);
 683                 list_del(&slot->funcs);
 684                 kfree(slot);
 685                 slot = next;
 686         }
 687
 688         pci_dev_put(bridge->pci_dev);
 689         list_del(&bridge->list);
 690         kfree(bridge);
 691 }
 692
 693 static acpi_status
 694 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 695 {
 696         struct acpiphp_bridge *bridge;
 697
 698         /* cleanup p2p bridges under this P2P bridge
 699            in a depth-first manner */
 700         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 701                                 cleanup_p2p_bridge, NULL, NULL);
 702
 703         if (!(bridge = acpiphp_handle_to_bridge(handle)))
 704                 return AE_OK;
 705         cleanup_bridge(bridge);
 706         return AE_OK;
 707 }
 708
 709 static void remove_bridge(acpi_handle handle)
 710 {
 711         struct acpiphp_bridge *bridge;
 712
 713         /* cleanup p2p bridges under this host bridge
 714            in a depth-first manner */
 715         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 716                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 717
 718         bridge = acpiphp_handle_to_bridge(handle);
 719         if (bridge)
 720                 cleanup_bridge(bridge);
 721 }
 722
 723 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 724 {
 725         struct acpi_pci_id id;
 726         struct pci_bus *bus;
 727         struct pci_dev *dev;
 728
 729         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 730                 return NULL;
 731
 732         bus = pci_find_bus(id.segment, id.bus);
 733         if (!bus)
 734                 return NULL;
 735
 736         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 737         if (!dev)
 738                 return NULL;
 739
 740         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 741             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 742         {
 743                 pci_dev_put(dev);
 744                 return NULL;
 745         }
 746
 747         return dev;
 748 }
 749
 750 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 751 {
 752         acpi_status status;
 753         int result = -1;
 754         unsigned long gsb;
 755         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 756         union acpi_object *obj;
 757         void *table;
 758
 759         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 760         if (ACPI_SUCCESS(status)) {
 761                 *gsi_base = (u32)gsb;
 762                 return 0;
 763         }
 764
 765         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 766         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 767                 return -1;
 768
 769         obj = buffer.pointer;
 770         if (obj->type != ACPI_TYPE_BUFFER)
 771                 goto out;
 772
 773         table = obj->buffer.pointer;
 774         switch (((struct acpi_subtable_header *)table)->type) {
 775         case ACPI_MADT_TYPE_IO_SAPIC:
 776                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
 777                 result = 0;
 778                 break;
 779         case ACPI_MADT_TYPE_IO_APIC:
 780                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
 781                 result = 0;
 782                 break;
 783         default:
 784                 break;
 785         }
 786  out:
 787         kfree(buffer.pointer);
 788         return result;
 789 }
 790
 791 static acpi_status
 792 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 793 {
 794         acpi_status status;
 795         unsigned long sta;
 796         acpi_handle tmp;
 797         struct pci_dev *pdev;
 798         u32 gsi_base;
 799         u64 phys_addr;
 800         struct acpiphp_ioapic *ioapic;
 801
 802         /* Evaluate _STA if present */
 803         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 804         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 805                 return AE_CTRL_DEPTH;
 806
 807         /* Scan only PCI bus scope */
 808         status = acpi_get_handle(handle, "_HID", &tmp);
 809         if (ACPI_SUCCESS(status))
 810                 return AE_CTRL_DEPTH;
 811
 812         if (get_gsi_base(handle, &gsi_base))
 813                 return AE_OK;
 814
 815         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 816         if (!ioapic)
 817                 return AE_NO_MEMORY;
 818
 819         pdev = get_apic_pci_info(handle);
 820         if (!pdev)
 821                 goto exit_kfree;
 822
 823         if (pci_enable_device(pdev))
 824                 goto exit_pci_dev_put;
 825
 826         pci_set_master(pdev);
 827
 828         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 829                 goto exit_pci_disable_device;
 830
 831         phys_addr = pci_resource_start(pdev, 0);
 832         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 833                 goto exit_pci_release_region;
 834
 835         ioapic->gsi_base = gsi_base;
 836         ioapic->dev = pdev;
 837         spin_lock(&ioapic_list_lock);
 838         list_add_tail(&ioapic->list, &ioapic_list);
 839         spin_unlock(&ioapic_list_lock);
 840
 841         return AE_OK;
 842
 843  exit_pci_release_region:
 844         pci_release_region(pdev, 0);
 845  exit_pci_disable_device:
 846         pci_disable_device(pdev);
 847  exit_pci_dev_put:
 848         pci_dev_put(pdev);
 849  exit_kfree:
 850         kfree(ioapic);
 851
 852         return AE_OK;
 853 }
 854
 855 static acpi_status
 856 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 857 {
 858         acpi_status status;
 859         unsigned long sta;
 860         acpi_handle tmp;
 861         u32 gsi_base;
 862         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 863
 864         /* Evaluate _STA if present */
 865         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 866         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 867                 return AE_CTRL_DEPTH;
 868
 869         /* Scan only PCI bus scope */
 870         status = acpi_get_handle(handle, "_HID", &tmp);
 871         if (ACPI_SUCCESS(status))
 872                 return AE_CTRL_DEPTH;
 873
 874         if (get_gsi_base(handle, &gsi_base))
 875                 return AE_OK;
 876
 877         acpi_unregister_ioapic(handle, gsi_base);
 878
 879         spin_lock(&ioapic_list_lock);
 880         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 881                 if (pos->gsi_base != gsi_base)
 882                         continue;
 883                 ioapic = pos;
 884                 list_del(&ioapic->list);
 885                 break;
 886         }
 887         spin_unlock(&ioapic_list_lock);
 888
 889         if (!ioapic)
 890                 return AE_OK;
 891
 892         pci_release_region(ioapic->dev, 0);
 893         pci_disable_device(ioapic->dev);
 894         pci_dev_put(ioapic->dev);
 895         kfree(ioapic);
 896
 897         return AE_OK;
 898 }
 899
 900 static int acpiphp_configure_ioapics(acpi_handle handle)
 901 {
 902         ioapic_add(handle, 0, NULL, NULL);
 903         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 904                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 905         return 0;
 906 }
 907
 908 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 909 {
 910         ioapic_remove(handle, 0, NULL, NULL);
 911         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 912                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 913         return 0;
 914 }
 915
 916 static int power_on_slot(struct acpiphp_slot *slot)
 917 {
 918         acpi_status status;
 919         struct acpiphp_func *func;
 920         struct list_head *l;
 921         int retval = 0;
 922
 923         /* if already enabled, just skip */
 924         if (slot->flags & SLOT_POWEREDON)
 925                 goto err_exit;
 926
 927         list_for_each (l, &slot->funcs) {
 928                 func = list_entry(l, struct acpiphp_func, sibling);
 929
 930                 if (func->flags & FUNC_HAS_PS0) {
 931                         dbg("%s: executing _PS0\n", __FUNCTION__);
 932                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 933                         if (ACPI_FAILURE(status)) {
 934                                 warn("%s: _PS0 failed\n", __FUNCTION__);
 935                                 retval = -1;
 936                                 goto err_exit;
 937                         } else
 938                                 break;
 939                 }
 940         }
 941
 942         /* TBD: evaluate _STA to check if the slot is enabled */
 943
 944         slot->flags |= SLOT_POWEREDON;
 945
 946  err_exit:
 947         return retval;
 948 }
 949
 950
 951 static int power_off_slot(struct acpiphp_slot *slot)
 952 {
 953         acpi_status status;
 954         struct acpiphp_func *func;
 955         struct list_head *l;
 956
 957         int retval = 0;
 958
 959         /* if already disabled, just skip */
 960         if ((slot->flags & SLOT_POWEREDON) == 0)
 961                 goto err_exit;
 962
 963         list_for_each (l, &slot->funcs) {
 964                 func = list_entry(l, struct acpiphp_func, sibling);
 965
 966                 if (func->flags & FUNC_HAS_PS3) {
 967                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 968                         if (ACPI_FAILURE(status)) {
 969                                 warn("%s: _PS3 failed\n", __FUNCTION__);
 970                                 retval = -1;
 971                                 goto err_exit;
 972                         } else
 973                                 break;
 974                 }
 975         }
 976
 977         /* TBD: evaluate _STA to check if the slot is disabled */
 978
 979         slot->flags &= (~SLOT_POWEREDON);
 980
 981  err_exit:
 982         return retval;
 983 }
 984
 985
 986
 987 /**
 988  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
 989  * @bus: bus to start search with
 990  */
 991 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
 992 {
 993         struct list_head *tmp;
 994         unsigned char max, n;
 995
 996         /*
 997          * pci_bus_max_busnr will return the highest
 998          * reserved busnr for all these children.
 999          * that is equivalent to the bus->subordinate
1000          * value.  We don't want to use the parent's
1001          * bus->subordinate value because it could have
1002          * padding in it.
1003          */
1004         max = bus->secondary;
1005
1006         list_for_each(tmp, &bus->children) {
1007                 n = pci_bus_max_busnr(pci_bus_b(tmp));
1008                 if (n > max)
1009                         max = n;
1010         }
1011         return max;
1012 }
1013
1014
1015 /**
1016  * acpiphp_bus_add - add a new bus to acpi subsystem
1017  * @func: acpiphp_func of the bridge
1018  */
1019 static int acpiphp_bus_add(struct acpiphp_func *func)
1020 {
1021         acpi_handle phandle;
1022         struct acpi_device *device, *pdevice;
1023         int ret_val;
1024
1025         acpi_get_parent(func->handle, &phandle);
1026         if (acpi_bus_get_device(phandle, &pdevice)) {
1027                 dbg("no parent device, assuming NULL\n");
1028                 pdevice = NULL;
1029         }
1030         if (!acpi_bus_get_device(func->handle, &device)) {
1031                 dbg("bus exists... trim\n");
1032                 /* this shouldn't be in here, so remove
1033                  * the bus then re-add it...
1034                  */
1035                 ret_val = acpi_bus_trim(device, 1);
1036                 dbg("acpi_bus_trim return %x\n", ret_val);
1037         }
1038
1039         ret_val = acpi_bus_add(&device, pdevice, func->handle,
1040                 ACPI_BUS_TYPE_DEVICE);
1041         if (ret_val) {
1042                 dbg("error adding bus, %x\n",
1043                         -ret_val);
1044                 goto acpiphp_bus_add_out;
1045         }
1046         /*
1047          * try to start anyway.  We could have failed to add
1048          * simply because this bus had previously been added
1049          * on another add.  Don't bother with the return value
1050          * we just keep going.
1051          */
1052         ret_val = acpi_bus_start(device);
1053
1054 acpiphp_bus_add_out:
1055         return ret_val;
1056 }
1057
1058
1059 /**
1060  * acpiphp_bus_trim - trim a bus from acpi subsystem
1061  * @handle: handle to acpi namespace
1062  */
1063 static int acpiphp_bus_trim(acpi_handle handle)
1064 {
1065         struct acpi_device *device;
1066         int retval;
1067
1068         retval = acpi_bus_get_device(handle, &device);
1069         if (retval) {
1070                 dbg("acpi_device not found\n");
1071                 return retval;
1072         }
1073
1074         retval = acpi_bus_trim(device, 1);
1075         if (retval)
1076                 err("cannot remove from acpi list\n");
1077
1078         return retval;
1079 }
1080
1081 /**
1082  * enable_device - enable, configure a slot
1083  * @slot: slot to be enabled
1084  *
1085  * This function should be called per *physical slot*,
1086  * not per each slot object in ACPI namespace.
1087  */
1088 static int __ref enable_device(struct acpiphp_slot *slot)
1089 {
1090         struct pci_dev *dev;
1091         struct pci_bus *bus = slot->bridge->pci_bus;
1092         struct list_head *l;
1093         struct acpiphp_func *func;
1094         int retval = 0;
1095         int num, max, pass;
1096         acpi_status status;
1097
1098         if (slot->flags & SLOT_ENABLED)
1099                 goto err_exit;
1100
1101         /* sanity check: dev should be NULL when hot-plugged in */
1102         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1103         if (dev) {
1104                 /* This case shouldn't happen */
1105                 err("pci_dev structure already exists.\n");
1106                 pci_dev_put(dev);
1107                 retval = -1;
1108                 goto err_exit;
1109         }
1110
1111         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1112         if (num == 0) {
1113                 err("No new device found\n");
1114                 retval = -1;
1115                 goto err_exit;
1116         }
1117
1118         max = acpiphp_max_busnr(bus);
1119         for (pass = 0; pass < 2; pass++) {
1120                 list_for_each_entry(dev, &bus->devices, bus_list) {
1121                         if (PCI_SLOT(dev->devfn) != slot->device)
1122                                 continue;
1123                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1124                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1125                                 max = pci_scan_bridge(bus, dev, max, pass);
1126                                 if (pass && dev->subordinate)
1127                                         pci_bus_size_bridges(dev->subordinate);
1128                         }
1129                 }
1130         }
1131
1132         list_for_each (l, &slot->funcs) {
1133                 func = list_entry(l, struct acpiphp_func, sibling);
1134                 acpiphp_bus_add(func);
1135         }
1136
1137         pci_bus_assign_resources(bus);
1138         acpiphp_sanitize_bus(bus);
1139         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1140         list_for_each_entry(func, &slot->funcs, sibling)
1141                 acpiphp_configure_ioapics(func->handle);
1142         pci_enable_bridges(bus);
1143         pci_bus_add_devices(bus);
1144
1145         /* associate pci_dev to our representation */
1146         list_for_each (l, &slot->funcs) {
1147                 func = list_entry(l, struct acpiphp_func, sibling);
1148                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1149                                                         func->function));
1150                 if (!func->pci_dev)
1151                         continue;
1152
1153                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1154                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1155                         continue;
1156
1157                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1158                 if (ACPI_FAILURE(status))
1159                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1160                                 status);
1161         }
1162
1163         slot->flags |= SLOT_ENABLED;
1164
1165  err_exit:
1166         return retval;
1167 }
1168
1169 static void disable_bridges(struct pci_bus *bus)
1170 {
1171         struct pci_dev *dev;
1172         list_for_each_entry(dev, &bus->devices, bus_list) {
1173                 if (dev->subordinate) {
1174                         disable_bridges(dev->subordinate);
1175                         pci_disable_device(dev);
1176                 }
1177         }
1178 }
1179
1180 /**
1181  * disable_device - disable a slot
1182  * @slot: ACPI PHP slot
1183  */
1184 static int disable_device(struct acpiphp_slot *slot)
1185 {
1186         int retval = 0;
1187         struct acpiphp_func *func;
1188         struct list_head *l;
1189
1190         /* is this slot already disabled? */
1191         if (!(slot->flags & SLOT_ENABLED))
1192                 goto err_exit;
1193
1194         list_for_each (l, &slot->funcs) {
1195                 func = list_entry(l, struct acpiphp_func, sibling);
1196
1197                 if (func->bridge) {
1198                         /* cleanup p2p bridges under this P2P bridge */
1199                         cleanup_p2p_bridge(func->bridge->handle,
1200                                                 (u32)1, NULL, NULL);
1201                         func->bridge = NULL;
1202                 }
1203
1204                 if (func->pci_dev) {
1205                         pci_stop_bus_device(func->pci_dev);
1206                         if (func->pci_dev->subordinate) {
1207                                 disable_bridges(func->pci_dev->subordinate);
1208                                 pci_disable_device(func->pci_dev);
1209                         }
1210                 }
1211         }
1212
1213         list_for_each (l, &slot->funcs) {
1214                 func = list_entry(l, struct acpiphp_func, sibling);
1215
1216                 acpiphp_unconfigure_ioapics(func->handle);
1217                 acpiphp_bus_trim(func->handle);
1218                 /* try to remove anyway.
1219                  * acpiphp_bus_add might have been failed */
1220
1221                 if (!func->pci_dev)
1222                         continue;
1223
1224                 pci_remove_bus_device(func->pci_dev);
1225                 pci_dev_put(func->pci_dev);
1226                 func->pci_dev = NULL;
1227         }
1228
1229         slot->flags &= (~SLOT_ENABLED);
1230
1231  err_exit:
1232         return retval;
1233 }
1234
1235
1236 /**
1237  * get_slot_status - get ACPI slot status
1238  * @slot: ACPI PHP slot
1239  *
1240  * If a slot has _STA for each function and if any one of them
1241  * returned non-zero status, return it.
1242  *
1243  * If a slot doesn't have _STA and if any one of its functions'
1244  * configuration space is configured, return 0x0f as a _STA.
1245  *
1246  * Otherwise return 0.
1247  */
1248 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1249 {
1250         acpi_status status;
1251         unsigned long sta = 0;
1252         u32 dvid;
1253         struct list_head *l;
1254         struct acpiphp_func *func;
1255
1256         list_for_each (l, &slot->funcs) {
1257                 func = list_entry(l, struct acpiphp_func, sibling);
1258
1259                 if (func->flags & FUNC_HAS_STA) {
1260                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1261                         if (ACPI_SUCCESS(status) && sta)
1262                                 break;
1263                 } else {
1264                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1265                                                   PCI_DEVFN(slot->device,
1266                                                             func->function),
1267                                                   PCI_VENDOR_ID, &dvid);
1268                         if (dvid != 0xffffffff) {
1269                                 sta = ACPI_STA_ALL;
1270                                 break;
1271                         }
1272                 }
1273         }
1274
1275         return (unsigned int)sta;
1276 }
1277
1278 /**
1279  * acpiphp_eject_slot - physically eject the slot
1280  * @slot: ACPI PHP slot
1281  */
1282 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1283 {
1284         acpi_status status;
1285         struct acpiphp_func *func;
1286         struct list_head *l;
1287         struct acpi_object_list arg_list;
1288         union acpi_object arg;
1289
1290         list_for_each (l, &slot->funcs) {
1291                 func = list_entry(l, struct acpiphp_func, sibling);
1292
1293                 /* We don't want to call _EJ0 on non-existing functions. */
1294                 if ((func->flags & FUNC_HAS_EJ0)) {
1295                         /* _EJ0 method take one argument */
1296                         arg_list.count = 1;
1297                         arg_list.pointer = &arg;
1298                         arg.type = ACPI_TYPE_INTEGER;
1299                         arg.integer.value = 1;
1300
1301                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1302                         if (ACPI_FAILURE(status)) {
1303                                 warn("%s: _EJ0 failed\n", __FUNCTION__);
1304                                 return -1;
1305                         } else
1306                                 break;
1307                 }
1308         }
1309         return 0;
1310 }
1311
1312 /**
1313  * acpiphp_check_bridge - re-enumerate devices
1314  * @bridge: where to begin re-enumeration
1315  *
1316  * Iterate over all slots under this bridge and make sure that if a
1317  * card is present they are enabled, and if not they are disabled.
1318  */
1319 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1320 {
1321         struct acpiphp_slot *slot;
1322         int retval = 0;
1323         int enabled, disabled;
1324
1325         enabled = disabled = 0;
1326
1327         for (slot = bridge->slots; slot; slot = slot->next) {
1328                 unsigned int status = get_slot_status(slot);
1329                 if (slot->flags & SLOT_ENABLED) {
1330                         if (status == ACPI_STA_ALL)
1331                                 continue;
1332                         retval = acpiphp_disable_slot(slot);
1333                         if (retval) {
1334                                 err("Error occurred in disabling\n");
1335                                 goto err_exit;
1336                         } else {
1337                                 acpiphp_eject_slot(slot);
1338                         }
1339                         disabled++;
1340                 } else {
1341                         if (status != ACPI_STA_ALL)
1342                                 continue;
1343                         retval = acpiphp_enable_slot(slot);
1344                         if (retval) {
1345                                 err("Error occurred in enabling\n");
1346                                 goto err_exit;
1347                         }
1348                         enabled++;
1349                 }
1350         }
1351
1352         dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
1353
1354  err_exit:
1355         return retval;
1356 }
1357
1358 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1359 {
1360         u16 pci_cmd, pci_bctl;
1361         struct pci_dev *cdev;
1362
1363         /* Program hpp values for this device */
1364         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1365                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1366                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1367                 return;
1368
1369         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1370                 return;
1371
1372         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1373                         bridge->hpp.t0->cache_line_size);
1374         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1375                         bridge->hpp.t0->latency_timer);
1376         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1377         if (bridge->hpp.t0->enable_serr)
1378                 pci_cmd |= PCI_COMMAND_SERR;
1379         else
1380                 pci_cmd &= ~PCI_COMMAND_SERR;
1381         if (bridge->hpp.t0->enable_perr)
1382                 pci_cmd |= PCI_COMMAND_PARITY;
1383         else
1384                 pci_cmd &= ~PCI_COMMAND_PARITY;
1385         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1386
1387         /* Program bridge control value and child devices */
1388         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1389                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1390                                 bridge->hpp.t0->latency_timer);
1391                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1392                 if (bridge->hpp.t0->enable_serr)
1393                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1394                 else
1395                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1396                 if (bridge->hpp.t0->enable_perr)
1397                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1398                 else
1399                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1400                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1401                 if (dev->subordinate) {
1402                         list_for_each_entry(cdev, &dev->subordinate->devices,
1403                                         bus_list)
1404                                 program_hpp(cdev, bridge);
1405                 }
1406         }
1407 }
1408
1409 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1410 {
1411         struct acpiphp_bridge bridge;
1412         struct pci_dev *dev;
1413
1414         memset(&bridge, 0, sizeof(bridge));
1415         bridge.handle = handle;
1416         bridge.pci_bus = bus;
1417         bridge.pci_dev = bus->self;
1418         decode_hpp(&bridge);
1419         list_for_each_entry(dev, &bus->devices, bus_list)
1420                 program_hpp(dev, &bridge);
1421
1422 }
1423
1424 /*
1425  * Remove devices for which we could not assign resources, call
1426  * arch specific code to fix-up the bus
1427  */
1428 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1429 {
1430         struct pci_dev *dev;
1431         int i;
1432         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1433
1434         list_for_each_entry(dev, &bus->devices, bus_list) {
1435                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1436                         struct resource *res = &dev->resource[i];
1437                         if ((res->flags & type_mask) && !res->start &&
1438                                         res->end) {
1439                                 /* Could not assign a required resources
1440                                  * for this device, remove it */
1441                                 pci_remove_bus_device(dev);
1442                                 break;
1443                         }
1444                 }
1445         }
1446 }
1447
1448 /* Program resources in newly inserted bridge */
1449 static int acpiphp_configure_bridge (acpi_handle handle)
1450 {
1451         struct acpi_pci_id pci_id;
1452         struct pci_bus *bus;
1453
1454         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1455                 err("cannot get PCI domain and bus number for bridge\n");
1456                 return -EINVAL;
1457         }
1458         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1459         if (!bus) {
1460                 err("cannot find bus %d:%d\n",
1461                                 pci_id.segment, pci_id.bus);
1462                 return -EINVAL;
1463         }
1464
1465         pci_bus_size_bridges(bus);
1466         pci_bus_assign_resources(bus);
1467         acpiphp_sanitize_bus(bus);
1468         acpiphp_set_hpp_values(handle, bus);
1469         pci_enable_bridges(bus);
1470         acpiphp_configure_ioapics(handle);
1471         return 0;
1472 }
1473
1474 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1475 {
1476         struct acpi_device *device, *pdevice;
1477         acpi_handle phandle;
1478
1479         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1480                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1481                 err("unexpected notification type %d\n", type);
1482                 return;
1483         }
1484
1485         acpi_get_parent(handle, &phandle);
1486         if (acpi_bus_get_device(phandle, &pdevice)) {
1487                 dbg("no parent device, assuming NULL\n");
1488                 pdevice = NULL;
1489         }
1490         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1491                 err("cannot add bridge to acpi list\n");
1492                 return;
1493         }
1494         if (!acpiphp_configure_bridge(handle) &&
1495                 !acpi_bus_start(device))
1496                 add_bridge(handle);
1497         else
1498                 err("cannot configure and start bridge\n");
1499
1500 }
1501
1502 /*
1503  * ACPI event handlers
1504  */
1505
1506 static acpi_status
1507 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1508 {
1509         int *count = (int *)context;
1510         struct acpiphp_bridge *bridge;
1511
1512         bridge = acpiphp_handle_to_bridge(handle);
1513         if (bridge)
1514                 (*count)++;
1515         return AE_OK ;
1516 }
1517
1518 static acpi_status
1519 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1520 {
1521         struct acpiphp_bridge *bridge;
1522         char objname[64];
1523         struct acpi_buffer buffer = { .length = sizeof(objname),
1524                                       .pointer = objname };
1525
1526         bridge = acpiphp_handle_to_bridge(handle);
1527         if (bridge) {
1528                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1529                 dbg("%s: re-enumerating slots under %s\n",
1530                         __FUNCTION__, objname);
1531                 acpiphp_check_bridge(bridge);
1532         }
1533         return AE_OK ;
1534 }
1535
1536 /**
1537  * handle_hotplug_event_bridge - handle ACPI event on bridges
1538  * @handle: Notify()'ed acpi_handle
1539  * @type: Notify code
1540  * @context: pointer to acpiphp_bridge structure
1541  *
1542  * Handles ACPI event notification on {host,p2p} bridges.
1543  */
1544 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1545 {
1546         struct acpiphp_bridge *bridge;
1547         char objname[64];
1548         struct acpi_buffer buffer = { .length = sizeof(objname),
1549                                       .pointer = objname };
1550         struct acpi_device *device;
1551         int num_sub_bridges = 0;
1552
1553         if (acpi_bus_get_device(handle, &device)) {
1554                 /* This bridge must have just been physically inserted */
1555                 handle_bridge_insertion(handle, type);
1556                 return;
1557         }
1558
1559         bridge = acpiphp_handle_to_bridge(handle);
1560         if (type == ACPI_NOTIFY_BUS_CHECK) {
1561                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1562                         count_sub_bridges, &num_sub_bridges, NULL);
1563         }
1564
1565         if (!bridge && !num_sub_bridges) {
1566                 err("cannot get bridge info\n");
1567                 return;
1568         }
1569
1570         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1571
1572         switch (type) {
1573         case ACPI_NOTIFY_BUS_CHECK:
1574                 /* bus re-enumerate */
1575                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1576                 if (bridge) {
1577                         dbg("%s: re-enumerating slots under %s\n",
1578                                 __FUNCTION__, objname);
1579                         acpiphp_check_bridge(bridge);
1580                 }
1581                 if (num_sub_bridges)
1582                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1583                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1584                 break;
1585
1586         case ACPI_NOTIFY_DEVICE_CHECK:
1587                 /* device check */
1588                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1589                 acpiphp_check_bridge(bridge);
1590                 break;
1591
1592         case ACPI_NOTIFY_DEVICE_WAKE:
1593                 /* wake event */
1594                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1595                 break;
1596
1597         case ACPI_NOTIFY_EJECT_REQUEST:
1598                 /* request device eject */
1599                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1600                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1601                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1602                         struct acpiphp_slot *slot;
1603                         slot = bridge->func->slot;
1604                         if (!acpiphp_disable_slot(slot))
1605                                 acpiphp_eject_slot(slot);
1606                 }
1607                 break;
1608
1609         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1610                 printk(KERN_ERR "Device %s cannot be configured due"
1611                                 " to a frequency mismatch\n", objname);
1612                 break;
1613
1614         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1615                 printk(KERN_ERR "Device %s cannot be configured due"
1616                                 " to a bus mode mismatch\n", objname);
1617                 break;
1618
1619         case ACPI_NOTIFY_POWER_FAULT:
1620                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1621                                 objname);
1622                 break;
1623
1624         default:
1625                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1626                 break;
1627         }
1628 }
1629
1630 /**
1631  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1632  * @handle: Notify()'ed acpi_handle
1633  * @type: Notify code
1634  * @context: pointer to acpiphp_func structure
1635  *
1636  * Handles ACPI event notification on slots.
1637  */
1638 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1639 {
1640         struct acpiphp_func *func;
1641         char objname[64];
1642         struct acpi_buffer buffer = { .length = sizeof(objname),
1643                                       .pointer = objname };
1644
1645         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1646
1647         func = (struct acpiphp_func *)context;
1648
1649         switch (type) {
1650         case ACPI_NOTIFY_BUS_CHECK:
1651                 /* bus re-enumerate */
1652                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1653                 acpiphp_enable_slot(func->slot);
1654                 break;
1655
1656         case ACPI_NOTIFY_DEVICE_CHECK:
1657                 /* device check : re-enumerate from parent bus */
1658                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1659                 acpiphp_check_bridge(func->slot->bridge);
1660                 break;
1661
1662         case ACPI_NOTIFY_DEVICE_WAKE:
1663                 /* wake event */
1664                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1665                 break;
1666
1667         case ACPI_NOTIFY_EJECT_REQUEST:
1668                 /* request device eject */
1669                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1670                 if (!(acpiphp_disable_slot(func->slot)))
1671                         acpiphp_eject_slot(func->slot);
1672                 break;
1673
1674         default:
1675                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1676                 break;
1677         }
1678 }
1679
1680
1681 static acpi_status
1682 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1683 {
1684         int *count = (int *)context;
1685
1686         if (acpi_root_bridge(handle)) {
1687                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1688                                 handle_hotplug_event_bridge, NULL);
1689                         (*count)++;
1690         }
1691         return AE_OK ;
1692 }
1693
1694 static struct acpi_pci_driver acpi_pci_hp_driver = {
1695         .add =          add_bridge,
1696         .remove =       remove_bridge,
1697 };
1698
1699 /**
1700  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1701  */
1702 int __init acpiphp_glue_init(void)
1703 {
1704         int num = 0;
1705
1706         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1707                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1708
1709         if (num <= 0)
1710                 return -1;
1711         else
1712                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1713
1714         return 0;
1715 }
1716
1717
1718 /**
1719  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1720  *
1721  * This function frees all data allocated in acpiphp_glue_init().
1722  */
1723 void  acpiphp_glue_exit(void)
1724 {
1725         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1726 }
1727
1728
1729 /**
1730  * acpiphp_get_num_slots - count number of slots in a system
1731  */
1732 int __init acpiphp_get_num_slots(void)
1733 {
1734         struct acpiphp_bridge *bridge;
1735         int num_slots = 0;
1736
1737         list_for_each_entry (bridge, &bridge_list, list) {
1738                 dbg("Bus %04x:%02x has %d slot%s\n",
1739                                 pci_domain_nr(bridge->pci_bus),
1740                                 bridge->pci_bus->number, bridge->nr_slots,
1741                                 bridge->nr_slots == 1 ? "" : "s");
1742                 num_slots += bridge->nr_slots;
1743         }
1744
1745         dbg("Total %d slots\n", num_slots);
1746         return num_slots;
1747 }
1748
1749
1750 #if 0
1751 /**
1752  * acpiphp_for_each_slot - call function for each slot
1753  * @fn: callback function
1754  * @data: context to be passed to callback function
1755  */
1756 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1757 {
1758         struct list_head *node;
1759         struct acpiphp_bridge *bridge;
1760         struct acpiphp_slot *slot;
1761         int retval = 0;
1762
1763         list_for_each (node, &bridge_list) {
1764                 bridge = (struct acpiphp_bridge *)node;
1765                 for (slot = bridge->slots; slot; slot = slot->next) {
1766                         retval = fn(slot, data);
1767                         if (!retval)
1768                                 goto err_exit;
1769                 }
1770         }
1771
1772  err_exit:
1773         return retval;
1774 }
1775 #endif
1776
1777
1778 /**
1779  * acpiphp_enable_slot - power on slot
1780  * @slot: ACPI PHP slot
1781  */
1782 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1783 {
1784         int retval;
1785
1786         mutex_lock(&slot->crit_sect);
1787
1788         /* wake up all functions */
1789         retval = power_on_slot(slot);
1790         if (retval)
1791                 goto err_exit;
1792
1793         if (get_slot_status(slot) == ACPI_STA_ALL) {
1794                 /* configure all functions */
1795                 retval = enable_device(slot);
1796                 if (retval)
1797                         power_off_slot(slot);
1798         } else {
1799                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__);
1800                 power_off_slot(slot);
1801         }
1802
1803  err_exit:
1804         mutex_unlock(&slot->crit_sect);
1805         return retval;
1806 }
1807
1808 /**
1809  * acpiphp_disable_slot - power off slot
1810  * @slot: ACPI PHP slot
1811  */
1812 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1813 {
1814         int retval = 0;
1815
1816         mutex_lock(&slot->crit_sect);
1817
1818         /* unconfigure all functions */
1819         retval = disable_device(slot);
1820         if (retval)
1821                 goto err_exit;
1822
1823         /* power off all functions */
1824         retval = power_off_slot(slot);
1825         if (retval)
1826                 goto err_exit;
1827
1828  err_exit:
1829         mutex_unlock(&slot->crit_sect);
1830         return retval;
1831 }
1832
1833
1834 /*
1835  * slot enabled:  1
1836  * slot disabled: 0
1837  */
1838 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1839 {
1840         return (slot->flags & SLOT_POWEREDON);
1841 }
1842
1843
1844 /*
1845  * latch   open:  1
1846  * latch closed:  0
1847  */
1848 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1849 {
1850         unsigned int sta;
1851
1852         sta = get_slot_status(slot);
1853
1854         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1855 }
1856
1857
1858 /*
1859  * adapter presence : 1
1860  *          absence : 0
1861  */
1862 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1863 {
1864         unsigned int sta;
1865
1866         sta = get_slot_status(slot);
1867
1868         return (sta == 0) ? 0 : 1;
1869 }
1870
1871
1872 /*
1873  * pci address (seg/bus/dev)
1874  */
1875 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1876 {
1877         u32 address;
1878         struct pci_bus *pci_bus = slot->bridge->pci_bus;
1879
1880         address = (pci_domain_nr(pci_bus) << 16) |
1881                   (pci_bus->number << 8) |
1882                   slot->device;
1883
1884         return address;
1885 }