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