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 static struct acpi_dock_ops acpiphp_dock_ops = {
 173         .handler = handle_hotplug_event_func,
 174 };
 175
 176 /* callback routine to register each ACPI PCI slot object */
 177 static acpi_status
 178 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 179 {
 180         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 181         struct acpiphp_slot *slot;
 182         struct acpiphp_func *newfunc;
 183         acpi_handle tmp;
 184         acpi_status status = AE_OK;
 185         unsigned long long adr, sun;
 186         int device, function, retval;
 187
 188         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 189
 190         if (ACPI_FAILURE(status))
 191                 return AE_OK;
 192
 193         status = acpi_get_handle(handle, "_EJ0", &tmp);
 194
 195         if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
 196                 return AE_OK;
 197
 198         device = (adr >> 16) & 0xffff;
 199         function = adr & 0xffff;
 200
 201         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 202         if (!newfunc)
 203                 return AE_NO_MEMORY;
 204
 205         INIT_LIST_HEAD(&newfunc->sibling);
 206         newfunc->handle = handle;
 207         newfunc->function = function;
 208         if (ACPI_SUCCESS(status))
 209                 newfunc->flags = FUNC_HAS_EJ0;
 210
 211         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 212                 newfunc->flags |= FUNC_HAS_STA;
 213
 214         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 215                 newfunc->flags |= FUNC_HAS_PS0;
 216
 217         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 218                 newfunc->flags |= FUNC_HAS_PS3;
 219
 220         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 221                 newfunc->flags |= FUNC_HAS_DCK;
 222
 223         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 224         if (ACPI_FAILURE(status)) {
 225                 /*
 226                  * use the count of the number of slots we've found
 227                  * for the number of the slot
 228                  */
 229                 sun = bridge->nr_slots+1;
 230         }
 231
 232         /* search for objects that share the same slot */
 233         for (slot = bridge->slots; slot; slot = slot->next)
 234                 if (slot->device == device) {
 235                         if (slot->sun != sun)
 236                                 warn("sibling found, but _SUN doesn't match!\n");
 237                         break;
 238                 }
 239
 240         if (!slot) {
 241                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 242                 if (!slot) {
 243                         kfree(newfunc);
 244                         return AE_NO_MEMORY;
 245                 }
 246
 247                 slot->bridge = bridge;
 248                 slot->device = device;
 249                 slot->sun = sun;
 250                 INIT_LIST_HEAD(&slot->funcs);
 251                 mutex_init(&slot->crit_sect);
 252
 253                 slot->next = bridge->slots;
 254                 bridge->slots = slot;
 255
 256                 bridge->nr_slots++;
 257
 258                 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 259                                 slot->sun, pci_domain_nr(bridge->pci_bus),
 260                                 bridge->pci_bus->number, slot->device);
 261                 retval = acpiphp_register_hotplug_slot(slot);
 262                 if (retval) {
 263                         if (retval == -EBUSY)
 264                                 warn("Slot %d already registered by another "
 265                                         "hotplug driver\n", slot->sun);
 266                         else
 267                                 warn("acpiphp_register_hotplug_slot failed "
 268                                         "(err code = 0x%x)\n", retval);
 269                         goto err_exit;
 270                 }
 271         }
 272
 273         newfunc->slot = slot;
 274         list_add_tail(&newfunc->sibling, &slot->funcs);
 275
 276         /* associate corresponding pci_dev */
 277         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 278                                          PCI_DEVFN(device, function));
 279         if (newfunc->pci_dev) {
 280                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 281         }
 282
 283         if (is_dock_device(handle)) {
 284                 /* we don't want to call this device's _EJ0
 285                  * because we want the dock notify handler
 286                  * to call it after it calls _DCK
 287                  */
 288                 newfunc->flags &= ~FUNC_HAS_EJ0;
 289                 if (register_hotplug_dock_device(handle,
 290                         &acpiphp_dock_ops, newfunc))
 291                         dbg("failed to register dock device\n");
 292
 293                 /* we need to be notified when dock events happen
 294                  * outside of the hotplug operation, since we may
 295                  * need to do fixups before we can hotplug.
 296                  */
 297                 newfunc->nb.notifier_call = post_dock_fixups;
 298                 if (register_dock_notifier(&newfunc->nb))
 299                         dbg("failed to register a dock notifier");
 300         }
 301
 302         /* install notify handler */
 303         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 304                 status = acpi_install_notify_handler(handle,
 305                                              ACPI_SYSTEM_NOTIFY,
 306                                              handle_hotplug_event_func,
 307                                              newfunc);
 308
 309                 if (ACPI_FAILURE(status))
 310                         err("failed to register interrupt notify handler\n");
 311         } else
 312                 status = AE_OK;
 313
 314         return status;
 315
 316  err_exit:
 317         bridge->nr_slots--;
 318         bridge->slots = slot->next;
 319         kfree(slot);
 320         kfree(newfunc);
 321
 322         return AE_OK;
 323 }
 324
 325
 326 /* see if it's worth looking at this bridge */
 327 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 328 {
 329         acpi_status status;
 330         int count;
 331
 332         count = 0;
 333
 334         /* only check slots defined directly below bridge object */
 335         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 336                                      is_ejectable_slot, (void *)&count, NULL);
 337
 338         /*
 339          * we also need to add this bridge if there is a dock bridge or
 340          * other pci device on a dock station (removable)
 341          */
 342         if (!count)
 343                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
 344                                 (u32)1, is_pci_dock_device, (void *)&count,
 345                                 NULL);
 346
 347         return count;
 348 }
 349
 350
 351 /* decode ACPI 2.0 _HPP hot plug parameters */
 352 static void decode_hpp(struct acpiphp_bridge *bridge)
 353 {
 354         acpi_status status;
 355
 356         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 357         if (ACPI_FAILURE(status) ||
 358             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 359                 /* use default numbers */
 360                 printk(KERN_WARNING
 361                        "%s: Could not get hotplug parameters. Use defaults\n",
 362                        __func__);
 363                 bridge->hpp.t0 = &bridge->hpp.type0_data;
 364                 bridge->hpp.t0->revision = 0;
 365                 bridge->hpp.t0->cache_line_size = 0x10;
 366                 bridge->hpp.t0->latency_timer = 0x40;
 367                 bridge->hpp.t0->enable_serr = 0;
 368                 bridge->hpp.t0->enable_perr = 0;
 369         }
 370 }
 371
 372
 373
 374 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 375 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 376 {
 377         acpi_status status;
 378
 379         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 380         decode_hpp(bridge);
 381
 382         /* must be added to the list prior to calling register_slot */
 383         list_add(&bridge->list, &bridge_list);
 384
 385         /* register all slot objects under this bridge */
 386         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 387                                      register_slot, bridge, NULL);
 388         if (ACPI_FAILURE(status)) {
 389                 list_del(&bridge->list);
 390                 return;
 391         }
 392
 393         /* install notify handler */
 394         if (bridge->type != BRIDGE_TYPE_HOST) {
 395                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 396                         status = acpi_remove_notify_handler(bridge->func->handle,
 397                                                 ACPI_SYSTEM_NOTIFY,
 398                                                 handle_hotplug_event_func);
 399                         if (ACPI_FAILURE(status))
 400                                 err("failed to remove notify handler\n");
 401                 }
 402                 status = acpi_install_notify_handler(bridge->handle,
 403                                              ACPI_SYSTEM_NOTIFY,
 404                                              handle_hotplug_event_bridge,
 405                                              bridge);
 406
 407                 if (ACPI_FAILURE(status)) {
 408                         err("failed to register interrupt notify handler\n");
 409                 }
 410         }
 411 }
 412
 413
 414 /* find acpiphp_func from acpiphp_bridge */
 415 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 416 {
 417         struct list_head *node, *l;
 418         struct acpiphp_bridge *bridge;
 419         struct acpiphp_slot *slot;
 420         struct acpiphp_func *func;
 421
 422         list_for_each(node, &bridge_list) {
 423                 bridge = list_entry(node, struct acpiphp_bridge, list);
 424                 for (slot = bridge->slots; slot; slot = slot->next) {
 425                         list_for_each(l, &slot->funcs) {
 426                                 func = list_entry(l, struct acpiphp_func,
 427                                                         sibling);
 428                                 if (func->handle == handle)
 429                                         return func;
 430                         }
 431                 }
 432         }
 433
 434         return NULL;
 435 }
 436
 437
 438 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 439 {
 440         acpi_handle dummy_handle;
 441
 442         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 443                                         "_STA", &dummy_handle)))
 444                 bridge->flags |= BRIDGE_HAS_STA;
 445
 446         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 447                                         "_EJ0", &dummy_handle)))
 448                 bridge->flags |= BRIDGE_HAS_EJ0;
 449
 450         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 451                                         "_PS0", &dummy_handle)))
 452                 bridge->flags |= BRIDGE_HAS_PS0;
 453
 454         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 455                                         "_PS3", &dummy_handle)))
 456                 bridge->flags |= BRIDGE_HAS_PS3;
 457
 458         /* is this ejectable p2p bridge? */
 459         if (bridge->flags & BRIDGE_HAS_EJ0) {
 460                 struct acpiphp_func *func;
 461
 462                 dbg("found ejectable p2p bridge\n");
 463
 464                 /* make link between PCI bridge and PCI function */
 465                 func = acpiphp_bridge_handle_to_function(bridge->handle);
 466                 if (!func)
 467                         return;
 468                 bridge->func = func;
 469                 func->bridge = bridge;
 470         }
 471 }
 472
 473
 474 /* allocate and initialize host bridge data structure */
 475 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 476 {
 477         struct acpiphp_bridge *bridge;
 478
 479         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 480         if (bridge == NULL)
 481                 return;
 482
 483         bridge->type = BRIDGE_TYPE_HOST;
 484         bridge->handle = handle;
 485
 486         bridge->pci_bus = pci_bus;
 487
 488         spin_lock_init(&bridge->res_lock);
 489
 490         init_bridge_misc(bridge);
 491 }
 492
 493
 494 /* allocate and initialize PCI-to-PCI bridge data structure */
 495 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 496 {
 497         struct acpiphp_bridge *bridge;
 498
 499         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 500         if (bridge == NULL) {
 501                 err("out of memory\n");
 502                 return;
 503         }
 504
 505         bridge->type = BRIDGE_TYPE_P2P;
 506         bridge->handle = handle;
 507         config_p2p_bridge_flags(bridge);
 508
 509         bridge->pci_dev = pci_dev_get(pci_dev);
 510         bridge->pci_bus = pci_dev->subordinate;
 511         if (!bridge->pci_bus) {
 512                 err("This is not a PCI-to-PCI bridge!\n");
 513                 goto err;
 514         }
 515
 516         spin_lock_init(&bridge->res_lock);
 517
 518         init_bridge_misc(bridge);
 519         return;
 520  err:
 521         pci_dev_put(pci_dev);
 522         kfree(bridge);
 523         return;
 524 }
 525
 526
 527 /* callback routine to find P2P bridges */
 528 static acpi_status
 529 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 530 {
 531         acpi_status status;
 532         acpi_handle dummy_handle;
 533         unsigned long long tmp;
 534         int device, function;
 535         struct pci_dev *dev;
 536         struct pci_bus *pci_bus = context;
 537
 538         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 539         if (ACPI_FAILURE(status))
 540                 return AE_OK;           /* continue */
 541
 542         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 543         if (ACPI_FAILURE(status)) {
 544                 dbg("%s: _ADR evaluation failure\n", __func__);
 545                 return AE_OK;
 546         }
 547
 548         device = (tmp >> 16) & 0xffff;
 549         function = tmp & 0xffff;
 550
 551         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 552
 553         if (!dev || !dev->subordinate)
 554                 goto out;
 555
 556         /* check if this bridge has ejectable slots */
 557         if ((detect_ejectable_slots(handle) > 0)) {
 558                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 559                 add_p2p_bridge(handle, dev);
 560         }
 561
 562         /* search P2P bridges under this p2p bridge */
 563         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 564                                      find_p2p_bridge, dev->subordinate, NULL);
 565         if (ACPI_FAILURE(status))
 566                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 567
 568  out:
 569         pci_dev_put(dev);
 570         return AE_OK;
 571 }
 572
 573
 574 /* find hot-pluggable slots, and then find P2P bridge */
 575 static int add_bridge(acpi_handle handle)
 576 {
 577         acpi_status status;
 578         unsigned long long tmp;
 579         int seg, bus;
 580         acpi_handle dummy_handle;
 581         struct pci_bus *pci_bus;
 582
 583         /* if the bridge doesn't have _STA, we assume it is always there */
 584         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 585         if (ACPI_SUCCESS(status)) {
 586                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 587                 if (ACPI_FAILURE(status)) {
 588                         dbg("%s: _STA evaluation failure\n", __func__);
 589                         return 0;
 590                 }
 591                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 592                         /* don't register this object */
 593                         return 0;
 594         }
 595
 596         /* get PCI segment number */
 597         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 598
 599         seg = ACPI_SUCCESS(status) ? tmp : 0;
 600
 601         /* get PCI bus number */
 602         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 603
 604         if (ACPI_SUCCESS(status)) {
 605                 bus = tmp;
 606         } else {
 607                 warn("can't get bus number, assuming 0\n");
 608                 bus = 0;
 609         }
 610
 611         pci_bus = pci_find_bus(seg, bus);
 612         if (!pci_bus) {
 613                 err("Can't find bus %04x:%02x\n", seg, bus);
 614                 return 0;
 615         }
 616
 617         /* check if this bridge has ejectable slots */
 618         if (detect_ejectable_slots(handle) > 0) {
 619                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 620                 add_host_bridge(handle, pci_bus);
 621         }
 622
 623         /* search P2P bridges under this host bridge */
 624         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 625                                      find_p2p_bridge, pci_bus, NULL);
 626
 627         if (ACPI_FAILURE(status))
 628                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 629
 630         return 0;
 631 }
 632
 633 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 634 {
 635         struct list_head *head;
 636         list_for_each(head, &bridge_list) {
 637                 struct acpiphp_bridge *bridge = list_entry(head,
 638                                                 struct acpiphp_bridge, list);
 639                 if (bridge->handle == handle)
 640                         return bridge;
 641         }
 642
 643         return NULL;
 644 }
 645
 646 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 647 {
 648         struct list_head *list, *tmp;
 649         struct acpiphp_slot *slot;
 650         acpi_status status;
 651         acpi_handle handle = bridge->handle;
 652
 653         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 654                                             handle_hotplug_event_bridge);
 655         if (ACPI_FAILURE(status))
 656                 err("failed to remove notify handler\n");
 657
 658         if ((bridge->type != BRIDGE_TYPE_HOST) &&
 659             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
 660                 status = acpi_install_notify_handler(bridge->func->handle,
 661                                                 ACPI_SYSTEM_NOTIFY,
 662                                                 handle_hotplug_event_func,
 663                                                 bridge->func);
 664                 if (ACPI_FAILURE(status))
 665                         err("failed to install interrupt notify handler\n");
 666         }
 667
 668         slot = bridge->slots;
 669         while (slot) {
 670                 struct acpiphp_slot *next = slot->next;
 671                 list_for_each_safe (list, tmp, &slot->funcs) {
 672                         struct acpiphp_func *func;
 673                         func = list_entry(list, struct acpiphp_func, sibling);
 674                         if (is_dock_device(func->handle)) {
 675                                 unregister_hotplug_dock_device(func->handle);
 676                                 unregister_dock_notifier(&func->nb);
 677                         }
 678                         if (!(func->flags & FUNC_HAS_DCK)) {
 679                                 status = acpi_remove_notify_handler(func->handle,
 680                                                 ACPI_SYSTEM_NOTIFY,
 681                                                 handle_hotplug_event_func);
 682                                 if (ACPI_FAILURE(status))
 683                                         err("failed to remove notify handler\n");
 684                         }
 685                         pci_dev_put(func->pci_dev);
 686                         list_del(list);
 687                         kfree(func);
 688                 }
 689                 acpiphp_unregister_hotplug_slot(slot);
 690                 list_del(&slot->funcs);
 691                 kfree(slot);
 692                 slot = next;
 693         }
 694
 695         pci_dev_put(bridge->pci_dev);
 696         list_del(&bridge->list);
 697         kfree(bridge);
 698 }
 699
 700 static acpi_status
 701 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 702 {
 703         struct acpiphp_bridge *bridge;
 704
 705         /* cleanup p2p bridges under this P2P bridge
 706            in a depth-first manner */
 707         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 708                                 cleanup_p2p_bridge, NULL, NULL);
 709
 710         bridge = acpiphp_handle_to_bridge(handle);
 711         if (bridge)
 712                 cleanup_bridge(bridge);
 713
 714         return AE_OK;
 715 }
 716
 717 static void remove_bridge(acpi_handle handle)
 718 {
 719         struct acpiphp_bridge *bridge;
 720
 721         /* cleanup p2p bridges under this host bridge
 722            in a depth-first manner */
 723         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 724                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 725
 726         /*
 727          * On root bridges with hotplug slots directly underneath (ie,
 728          * no p2p bridge inbetween), we call cleanup_bridge().
 729          *
 730          * The else clause cleans up root bridges that either had no
 731          * hotplug slots at all, or had a p2p bridge underneath.
 732          */
 733         bridge = acpiphp_handle_to_bridge(handle);
 734         if (bridge)
 735                 cleanup_bridge(bridge);
 736         else
 737                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 738                                            handle_hotplug_event_bridge);
 739 }
 740
 741 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 742 {
 743         struct acpi_pci_id id;
 744         struct pci_bus *bus;
 745         struct pci_dev *dev;
 746
 747         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 748                 return NULL;
 749
 750         bus = pci_find_bus(id.segment, id.bus);
 751         if (!bus)
 752                 return NULL;
 753
 754         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 755         if (!dev)
 756                 return NULL;
 757
 758         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 759             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 760         {
 761                 pci_dev_put(dev);
 762                 return NULL;
 763         }
 764
 765         return dev;
 766 }
 767
 768 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 769 {
 770         acpi_status status;
 771         int result = -1;
 772         unsigned long long gsb;
 773         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 774         union acpi_object *obj;
 775         void *table;
 776
 777         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 778         if (ACPI_SUCCESS(status)) {
 779                 *gsi_base = (u32)gsb;
 780                 return 0;
 781         }
 782
 783         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 784         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 785                 return -1;
 786
 787         obj = buffer.pointer;
 788         if (obj->type != ACPI_TYPE_BUFFER)
 789                 goto out;
 790
 791         table = obj->buffer.pointer;
 792         switch (((struct acpi_subtable_header *)table)->type) {
 793         case ACPI_MADT_TYPE_IO_SAPIC:
 794                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
 795                 result = 0;
 796                 break;
 797         case ACPI_MADT_TYPE_IO_APIC:
 798                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
 799                 result = 0;
 800                 break;
 801         default:
 802                 break;
 803         }
 804  out:
 805         kfree(buffer.pointer);
 806         return result;
 807 }
 808
 809 static acpi_status
 810 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 811 {
 812         acpi_status status;
 813         unsigned long long sta;
 814         acpi_handle tmp;
 815         struct pci_dev *pdev;
 816         u32 gsi_base;
 817         u64 phys_addr;
 818         struct acpiphp_ioapic *ioapic;
 819
 820         /* Evaluate _STA if present */
 821         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 822         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 823                 return AE_CTRL_DEPTH;
 824
 825         /* Scan only PCI bus scope */
 826         status = acpi_get_handle(handle, "_HID", &tmp);
 827         if (ACPI_SUCCESS(status))
 828                 return AE_CTRL_DEPTH;
 829
 830         if (get_gsi_base(handle, &gsi_base))
 831                 return AE_OK;
 832
 833         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 834         if (!ioapic)
 835                 return AE_NO_MEMORY;
 836
 837         pdev = get_apic_pci_info(handle);
 838         if (!pdev)
 839                 goto exit_kfree;
 840
 841         if (pci_enable_device(pdev))
 842                 goto exit_pci_dev_put;
 843
 844         pci_set_master(pdev);
 845
 846         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 847                 goto exit_pci_disable_device;
 848
 849         phys_addr = pci_resource_start(pdev, 0);
 850         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 851                 goto exit_pci_release_region;
 852
 853         ioapic->gsi_base = gsi_base;
 854         ioapic->dev = pdev;
 855         spin_lock(&ioapic_list_lock);
 856         list_add_tail(&ioapic->list, &ioapic_list);
 857         spin_unlock(&ioapic_list_lock);
 858
 859         return AE_OK;
 860
 861  exit_pci_release_region:
 862         pci_release_region(pdev, 0);
 863  exit_pci_disable_device:
 864         pci_disable_device(pdev);
 865  exit_pci_dev_put:
 866         pci_dev_put(pdev);
 867  exit_kfree:
 868         kfree(ioapic);
 869
 870         return AE_OK;
 871 }
 872
 873 static acpi_status
 874 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 875 {
 876         acpi_status status;
 877         unsigned long long sta;
 878         acpi_handle tmp;
 879         u32 gsi_base;
 880         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 881
 882         /* Evaluate _STA if present */
 883         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 884         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 885                 return AE_CTRL_DEPTH;
 886
 887         /* Scan only PCI bus scope */
 888         status = acpi_get_handle(handle, "_HID", &tmp);
 889         if (ACPI_SUCCESS(status))
 890                 return AE_CTRL_DEPTH;
 891
 892         if (get_gsi_base(handle, &gsi_base))
 893                 return AE_OK;
 894
 895         acpi_unregister_ioapic(handle, gsi_base);
 896
 897         spin_lock(&ioapic_list_lock);
 898         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 899                 if (pos->gsi_base != gsi_base)
 900                         continue;
 901                 ioapic = pos;
 902                 list_del(&ioapic->list);
 903                 break;
 904         }
 905         spin_unlock(&ioapic_list_lock);
 906
 907         if (!ioapic)
 908                 return AE_OK;
 909
 910         pci_release_region(ioapic->dev, 0);
 911         pci_disable_device(ioapic->dev);
 912         pci_dev_put(ioapic->dev);
 913         kfree(ioapic);
 914
 915         return AE_OK;
 916 }
 917
 918 static int acpiphp_configure_ioapics(acpi_handle handle)
 919 {
 920         ioapic_add(handle, 0, NULL, NULL);
 921         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 922                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 923         return 0;
 924 }
 925
 926 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 927 {
 928         ioapic_remove(handle, 0, NULL, NULL);
 929         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 930                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 931         return 0;
 932 }
 933
 934 static int power_on_slot(struct acpiphp_slot *slot)
 935 {
 936         acpi_status status;
 937         struct acpiphp_func *func;
 938         struct list_head *l;
 939         int retval = 0;
 940
 941         /* if already enabled, just skip */
 942         if (slot->flags & SLOT_POWEREDON)
 943                 goto err_exit;
 944
 945         list_for_each (l, &slot->funcs) {
 946                 func = list_entry(l, struct acpiphp_func, sibling);
 947
 948                 if (func->flags & FUNC_HAS_PS0) {
 949                         dbg("%s: executing _PS0\n", __func__);
 950                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 951                         if (ACPI_FAILURE(status)) {
 952                                 warn("%s: _PS0 failed\n", __func__);
 953                                 retval = -1;
 954                                 goto err_exit;
 955                         } else
 956                                 break;
 957                 }
 958         }
 959
 960         /* TBD: evaluate _STA to check if the slot is enabled */
 961
 962         slot->flags |= SLOT_POWEREDON;
 963
 964  err_exit:
 965         return retval;
 966 }
 967
 968
 969 static int power_off_slot(struct acpiphp_slot *slot)
 970 {
 971         acpi_status status;
 972         struct acpiphp_func *func;
 973         struct list_head *l;
 974
 975         int retval = 0;
 976
 977         /* if already disabled, just skip */
 978         if ((slot->flags & SLOT_POWEREDON) == 0)
 979                 goto err_exit;
 980
 981         list_for_each (l, &slot->funcs) {
 982                 func = list_entry(l, struct acpiphp_func, sibling);
 983
 984                 if (func->flags & FUNC_HAS_PS3) {
 985                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 986                         if (ACPI_FAILURE(status)) {
 987                                 warn("%s: _PS3 failed\n", __func__);
 988                                 retval = -1;
 989                                 goto err_exit;
 990                         } else
 991                                 break;
 992                 }
 993         }
 994
 995         /* TBD: evaluate _STA to check if the slot is disabled */
 996
 997         slot->flags &= (~SLOT_POWEREDON);
 998
 999  err_exit:
1000         return retval;
1001 }
1002
1003
1004
1005 /**
1006  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
1007  * @bus: bus to start search with
1008  */
1009 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
1010 {
1011         struct list_head *tmp;
1012         unsigned char max, n;
1013
1014         /*
1015          * pci_bus_max_busnr will return the highest
1016          * reserved busnr for all these children.
1017          * that is equivalent to the bus->subordinate
1018          * value.  We don't want to use the parent's
1019          * bus->subordinate value because it could have
1020          * padding in it.
1021          */
1022         max = bus->secondary;
1023
1024         list_for_each(tmp, &bus->children) {
1025                 n = pci_bus_max_busnr(pci_bus_b(tmp));
1026                 if (n > max)
1027                         max = n;
1028         }
1029         return max;
1030 }
1031
1032
1033 /**
1034  * acpiphp_bus_add - add a new bus to acpi subsystem
1035  * @func: acpiphp_func of the bridge
1036  */
1037 static int acpiphp_bus_add(struct acpiphp_func *func)
1038 {
1039         acpi_handle phandle;
1040         struct acpi_device *device, *pdevice;
1041         int ret_val;
1042
1043         acpi_get_parent(func->handle, &phandle);
1044         if (acpi_bus_get_device(phandle, &pdevice)) {
1045                 dbg("no parent device, assuming NULL\n");
1046                 pdevice = NULL;
1047         }
1048         if (!acpi_bus_get_device(func->handle, &device)) {
1049                 dbg("bus exists... trim\n");
1050                 /* this shouldn't be in here, so remove
1051                  * the bus then re-add it...
1052                  */
1053                 ret_val = acpi_bus_trim(device, 1);
1054                 dbg("acpi_bus_trim return %x\n", ret_val);
1055         }
1056
1057         ret_val = acpi_bus_add(&device, pdevice, func->handle,
1058                 ACPI_BUS_TYPE_DEVICE);
1059         if (ret_val) {
1060                 dbg("error adding bus, %x\n",
1061                         -ret_val);
1062                 goto acpiphp_bus_add_out;
1063         }
1064         /*
1065          * try to start anyway.  We could have failed to add
1066          * simply because this bus had previously been added
1067          * on another add.  Don't bother with the return value
1068          * we just keep going.
1069          */
1070         ret_val = acpi_bus_start(device);
1071
1072 acpiphp_bus_add_out:
1073         return ret_val;
1074 }
1075
1076
1077 /**
1078  * acpiphp_bus_trim - trim a bus from acpi subsystem
1079  * @handle: handle to acpi namespace
1080  */
1081 static int acpiphp_bus_trim(acpi_handle handle)
1082 {
1083         struct acpi_device *device;
1084         int retval;
1085
1086         retval = acpi_bus_get_device(handle, &device);
1087         if (retval) {
1088                 dbg("acpi_device not found\n");
1089                 return retval;
1090         }
1091
1092         retval = acpi_bus_trim(device, 1);
1093         if (retval)
1094                 err("cannot remove from acpi list\n");
1095
1096         return retval;
1097 }
1098
1099 /**
1100  * enable_device - enable, configure a slot
1101  * @slot: slot to be enabled
1102  *
1103  * This function should be called per *physical slot*,
1104  * not per each slot object in ACPI namespace.
1105  */
1106 static int __ref enable_device(struct acpiphp_slot *slot)
1107 {
1108         struct pci_dev *dev;
1109         struct pci_bus *bus = slot->bridge->pci_bus;
1110         struct list_head *l;
1111         struct acpiphp_func *func;
1112         int retval = 0;
1113         int num, max, pass;
1114         acpi_status status;
1115
1116         if (slot->flags & SLOT_ENABLED)
1117                 goto err_exit;
1118
1119         /* sanity check: dev should be NULL when hot-plugged in */
1120         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1121         if (dev) {
1122                 /* This case shouldn't happen */
1123                 err("pci_dev structure already exists.\n");
1124                 pci_dev_put(dev);
1125                 retval = -1;
1126                 goto err_exit;
1127         }
1128
1129         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1130         if (num == 0) {
1131                 err("No new device found\n");
1132                 retval = -1;
1133                 goto err_exit;
1134         }
1135
1136         max = acpiphp_max_busnr(bus);
1137         for (pass = 0; pass < 2; pass++) {
1138                 list_for_each_entry(dev, &bus->devices, bus_list) {
1139                         if (PCI_SLOT(dev->devfn) != slot->device)
1140                                 continue;
1141                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1142                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1143                                 max = pci_scan_bridge(bus, dev, max, pass);
1144                                 if (pass && dev->subordinate)
1145                                         pci_bus_size_bridges(dev->subordinate);
1146                         }
1147                 }
1148         }
1149
1150         list_for_each (l, &slot->funcs) {
1151                 func = list_entry(l, struct acpiphp_func, sibling);
1152                 acpiphp_bus_add(func);
1153         }
1154
1155         pci_bus_assign_resources(bus);
1156         acpiphp_sanitize_bus(bus);
1157         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1158         list_for_each_entry(func, &slot->funcs, sibling)
1159                 acpiphp_configure_ioapics(func->handle);
1160         pci_enable_bridges(bus);
1161         pci_bus_add_devices(bus);
1162
1163         /* associate pci_dev to our representation */
1164         list_for_each (l, &slot->funcs) {
1165                 func = list_entry(l, struct acpiphp_func, sibling);
1166                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1167                                                         func->function));
1168                 if (!func->pci_dev)
1169                         continue;
1170
1171                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1172                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1173                         continue;
1174
1175                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1176                 if (ACPI_FAILURE(status))
1177                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1178                                 status);
1179         }
1180
1181         slot->flags |= SLOT_ENABLED;
1182
1183  err_exit:
1184         return retval;
1185 }
1186
1187 static void disable_bridges(struct pci_bus *bus)
1188 {
1189         struct pci_dev *dev;
1190         list_for_each_entry(dev, &bus->devices, bus_list) {
1191                 if (dev->subordinate) {
1192                         disable_bridges(dev->subordinate);
1193                         pci_disable_device(dev);
1194                 }
1195         }
1196 }
1197
1198 /**
1199  * disable_device - disable a slot
1200  * @slot: ACPI PHP slot
1201  */
1202 static int disable_device(struct acpiphp_slot *slot)
1203 {
1204         int retval = 0;
1205         struct acpiphp_func *func;
1206         struct list_head *l;
1207
1208         /* is this slot already disabled? */
1209         if (!(slot->flags & SLOT_ENABLED))
1210                 goto err_exit;
1211
1212         list_for_each (l, &slot->funcs) {
1213                 func = list_entry(l, struct acpiphp_func, sibling);
1214
1215                 if (func->bridge) {
1216                         /* cleanup p2p bridges under this P2P bridge */
1217                         cleanup_p2p_bridge(func->bridge->handle,
1218                                                 (u32)1, NULL, NULL);
1219                         func->bridge = NULL;
1220                 }
1221
1222                 if (func->pci_dev) {
1223                         pci_stop_bus_device(func->pci_dev);
1224                         if (func->pci_dev->subordinate) {
1225                                 disable_bridges(func->pci_dev->subordinate);
1226                                 pci_disable_device(func->pci_dev);
1227                         }
1228                 }
1229         }
1230
1231         list_for_each (l, &slot->funcs) {
1232                 func = list_entry(l, struct acpiphp_func, sibling);
1233
1234                 acpiphp_unconfigure_ioapics(func->handle);
1235                 acpiphp_bus_trim(func->handle);
1236                 /* try to remove anyway.
1237                  * acpiphp_bus_add might have been failed */
1238
1239                 if (!func->pci_dev)
1240                         continue;
1241
1242                 pci_remove_bus_device(func->pci_dev);
1243                 pci_dev_put(func->pci_dev);
1244                 func->pci_dev = NULL;
1245         }
1246
1247         slot->flags &= (~SLOT_ENABLED);
1248
1249  err_exit:
1250         return retval;
1251 }
1252
1253
1254 /**
1255  * get_slot_status - get ACPI slot status
1256  * @slot: ACPI PHP slot
1257  *
1258  * If a slot has _STA for each function and if any one of them
1259  * returned non-zero status, return it.
1260  *
1261  * If a slot doesn't have _STA and if any one of its functions'
1262  * configuration space is configured, return 0x0f as a _STA.
1263  *
1264  * Otherwise return 0.
1265  */
1266 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1267 {
1268         acpi_status status;
1269         unsigned long long sta = 0;
1270         u32 dvid;
1271         struct list_head *l;
1272         struct acpiphp_func *func;
1273
1274         list_for_each (l, &slot->funcs) {
1275                 func = list_entry(l, struct acpiphp_func, sibling);
1276
1277                 if (func->flags & FUNC_HAS_STA) {
1278                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1279                         if (ACPI_SUCCESS(status) && sta)
1280                                 break;
1281                 } else {
1282                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1283                                                   PCI_DEVFN(slot->device,
1284                                                             func->function),
1285                                                   PCI_VENDOR_ID, &dvid);
1286                         if (dvid != 0xffffffff) {
1287                                 sta = ACPI_STA_ALL;
1288                                 break;
1289                         }
1290                 }
1291         }
1292
1293         return (unsigned int)sta;
1294 }
1295
1296 /**
1297  * acpiphp_eject_slot - physically eject the slot
1298  * @slot: ACPI PHP slot
1299  */
1300 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1301 {
1302         acpi_status status;
1303         struct acpiphp_func *func;
1304         struct list_head *l;
1305         struct acpi_object_list arg_list;
1306         union acpi_object arg;
1307
1308         list_for_each (l, &slot->funcs) {
1309                 func = list_entry(l, struct acpiphp_func, sibling);
1310
1311                 /* We don't want to call _EJ0 on non-existing functions. */
1312                 if ((func->flags & FUNC_HAS_EJ0)) {
1313                         /* _EJ0 method take one argument */
1314                         arg_list.count = 1;
1315                         arg_list.pointer = &arg;
1316                         arg.type = ACPI_TYPE_INTEGER;
1317                         arg.integer.value = 1;
1318
1319                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1320                         if (ACPI_FAILURE(status)) {
1321                                 warn("%s: _EJ0 failed\n", __func__);
1322                                 return -1;
1323                         } else
1324                                 break;
1325                 }
1326         }
1327         return 0;
1328 }
1329
1330 /**
1331  * acpiphp_check_bridge - re-enumerate devices
1332  * @bridge: where to begin re-enumeration
1333  *
1334  * Iterate over all slots under this bridge and make sure that if a
1335  * card is present they are enabled, and if not they are disabled.
1336  */
1337 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1338 {
1339         struct acpiphp_slot *slot;
1340         int retval = 0;
1341         int enabled, disabled;
1342
1343         enabled = disabled = 0;
1344
1345         for (slot = bridge->slots; slot; slot = slot->next) {
1346                 unsigned int status = get_slot_status(slot);
1347                 if (slot->flags & SLOT_ENABLED) {
1348                         if (status == ACPI_STA_ALL)
1349                                 continue;
1350                         retval = acpiphp_disable_slot(slot);
1351                         if (retval) {
1352                                 err("Error occurred in disabling\n");
1353                                 goto err_exit;
1354                         } else {
1355                                 acpiphp_eject_slot(slot);
1356                         }
1357                         disabled++;
1358                 } else {
1359                         if (status != ACPI_STA_ALL)
1360                                 continue;
1361                         retval = acpiphp_enable_slot(slot);
1362                         if (retval) {
1363                                 err("Error occurred in enabling\n");
1364                                 goto err_exit;
1365                         }
1366                         enabled++;
1367                 }
1368         }
1369
1370         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1371
1372  err_exit:
1373         return retval;
1374 }
1375
1376 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1377 {
1378         u16 pci_cmd, pci_bctl;
1379         struct pci_dev *cdev;
1380
1381         /* Program hpp values for this device */
1382         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1383                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1384                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1385                 return;
1386
1387         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1388                 return;
1389
1390         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1391                         bridge->hpp.t0->cache_line_size);
1392         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1393                         bridge->hpp.t0->latency_timer);
1394         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1395         if (bridge->hpp.t0->enable_serr)
1396                 pci_cmd |= PCI_COMMAND_SERR;
1397         else
1398                 pci_cmd &= ~PCI_COMMAND_SERR;
1399         if (bridge->hpp.t0->enable_perr)
1400                 pci_cmd |= PCI_COMMAND_PARITY;
1401         else
1402                 pci_cmd &= ~PCI_COMMAND_PARITY;
1403         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1404
1405         /* Program bridge control value and child devices */
1406         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1407                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1408                                 bridge->hpp.t0->latency_timer);
1409                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1410                 if (bridge->hpp.t0->enable_serr)
1411                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1412                 else
1413                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1414                 if (bridge->hpp.t0->enable_perr)
1415                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1416                 else
1417                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1418                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1419                 if (dev->subordinate) {
1420                         list_for_each_entry(cdev, &dev->subordinate->devices,
1421                                         bus_list)
1422                                 program_hpp(cdev, bridge);
1423                 }
1424         }
1425 }
1426
1427 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1428 {
1429         struct acpiphp_bridge bridge;
1430         struct pci_dev *dev;
1431
1432         memset(&bridge, 0, sizeof(bridge));
1433         bridge.handle = handle;
1434         bridge.pci_bus = bus;
1435         bridge.pci_dev = bus->self;
1436         decode_hpp(&bridge);
1437         list_for_each_entry(dev, &bus->devices, bus_list)
1438                 program_hpp(dev, &bridge);
1439
1440 }
1441
1442 /*
1443  * Remove devices for which we could not assign resources, call
1444  * arch specific code to fix-up the bus
1445  */
1446 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1447 {
1448         struct pci_dev *dev;
1449         int i;
1450         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1451
1452         list_for_each_entry(dev, &bus->devices, bus_list) {
1453                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1454                         struct resource *res = &dev->resource[i];
1455                         if ((res->flags & type_mask) && !res->start &&
1456                                         res->end) {
1457                                 /* Could not assign a required resources
1458                                  * for this device, remove it */
1459                                 pci_remove_bus_device(dev);
1460                                 break;
1461                         }
1462                 }
1463         }
1464 }
1465
1466 /* Program resources in newly inserted bridge */
1467 static int acpiphp_configure_bridge (acpi_handle handle)
1468 {
1469         struct acpi_pci_id pci_id;
1470         struct pci_bus *bus;
1471
1472         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1473                 err("cannot get PCI domain and bus number for bridge\n");
1474                 return -EINVAL;
1475         }
1476         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1477         if (!bus) {
1478                 err("cannot find bus %d:%d\n",
1479                                 pci_id.segment, pci_id.bus);
1480                 return -EINVAL;
1481         }
1482
1483         pci_bus_size_bridges(bus);
1484         pci_bus_assign_resources(bus);
1485         acpiphp_sanitize_bus(bus);
1486         acpiphp_set_hpp_values(handle, bus);
1487         pci_enable_bridges(bus);
1488         acpiphp_configure_ioapics(handle);
1489         return 0;
1490 }
1491
1492 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1493 {
1494         struct acpi_device *device, *pdevice;
1495         acpi_handle phandle;
1496
1497         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1498                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1499                 err("unexpected notification type %d\n", type);
1500                 return;
1501         }
1502
1503         acpi_get_parent(handle, &phandle);
1504         if (acpi_bus_get_device(phandle, &pdevice)) {
1505                 dbg("no parent device, assuming NULL\n");
1506                 pdevice = NULL;
1507         }
1508         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1509                 err("cannot add bridge to acpi list\n");
1510                 return;
1511         }
1512         if (!acpiphp_configure_bridge(handle) &&
1513                 !acpi_bus_start(device))
1514                 add_bridge(handle);
1515         else
1516                 err("cannot configure and start bridge\n");
1517
1518 }
1519
1520 /*
1521  * ACPI event handlers
1522  */
1523
1524 static acpi_status
1525 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1526 {
1527         int *count = (int *)context;
1528         struct acpiphp_bridge *bridge;
1529
1530         bridge = acpiphp_handle_to_bridge(handle);
1531         if (bridge)
1532                 (*count)++;
1533         return AE_OK ;
1534 }
1535
1536 static acpi_status
1537 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1538 {
1539         struct acpiphp_bridge *bridge;
1540         char objname[64];
1541         struct acpi_buffer buffer = { .length = sizeof(objname),
1542                                       .pointer = objname };
1543
1544         bridge = acpiphp_handle_to_bridge(handle);
1545         if (bridge) {
1546                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1547                 dbg("%s: re-enumerating slots under %s\n",
1548                         __func__, objname);
1549                 acpiphp_check_bridge(bridge);
1550         }
1551         return AE_OK ;
1552 }
1553
1554 /**
1555  * handle_hotplug_event_bridge - handle ACPI event on bridges
1556  * @handle: Notify()'ed acpi_handle
1557  * @type: Notify code
1558  * @context: pointer to acpiphp_bridge structure
1559  *
1560  * Handles ACPI event notification on {host,p2p} bridges.
1561  */
1562 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1563 {
1564         struct acpiphp_bridge *bridge;
1565         char objname[64];
1566         struct acpi_buffer buffer = { .length = sizeof(objname),
1567                                       .pointer = objname };
1568         struct acpi_device *device;
1569         int num_sub_bridges = 0;
1570
1571         if (acpi_bus_get_device(handle, &device)) {
1572                 /* This bridge must have just been physically inserted */
1573                 handle_bridge_insertion(handle, type);
1574                 return;
1575         }
1576
1577         bridge = acpiphp_handle_to_bridge(handle);
1578         if (type == ACPI_NOTIFY_BUS_CHECK) {
1579                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1580                         count_sub_bridges, &num_sub_bridges, NULL);
1581         }
1582
1583         if (!bridge && !num_sub_bridges) {
1584                 err("cannot get bridge info\n");
1585                 return;
1586         }
1587
1588         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1589
1590         switch (type) {
1591         case ACPI_NOTIFY_BUS_CHECK:
1592                 /* bus re-enumerate */
1593                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1594                 if (bridge) {
1595                         dbg("%s: re-enumerating slots under %s\n",
1596                                 __func__, objname);
1597                         acpiphp_check_bridge(bridge);
1598                 }
1599                 if (num_sub_bridges)
1600                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1601                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1602                 break;
1603
1604         case ACPI_NOTIFY_DEVICE_CHECK:
1605                 /* device check */
1606                 dbg("%s: Device check notify on %s\n", __func__, objname);
1607                 acpiphp_check_bridge(bridge);
1608                 break;
1609
1610         case ACPI_NOTIFY_DEVICE_WAKE:
1611                 /* wake event */
1612                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1613                 break;
1614
1615         case ACPI_NOTIFY_EJECT_REQUEST:
1616                 /* request device eject */
1617                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1618                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1619                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1620                         struct acpiphp_slot *slot;
1621                         slot = bridge->func->slot;
1622                         if (!acpiphp_disable_slot(slot))
1623                                 acpiphp_eject_slot(slot);
1624                 }
1625                 break;
1626
1627         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1628                 printk(KERN_ERR "Device %s cannot be configured due"
1629                                 " to a frequency mismatch\n", objname);
1630                 break;
1631
1632         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1633                 printk(KERN_ERR "Device %s cannot be configured due"
1634                                 " to a bus mode mismatch\n", objname);
1635                 break;
1636
1637         case ACPI_NOTIFY_POWER_FAULT:
1638                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1639                                 objname);
1640                 break;
1641
1642         default:
1643                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1644                 break;
1645         }
1646 }
1647
1648 /**
1649  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1650  * @handle: Notify()'ed acpi_handle
1651  * @type: Notify code
1652  * @context: pointer to acpiphp_func structure
1653  *
1654  * Handles ACPI event notification on slots.
1655  */
1656 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1657 {
1658         struct acpiphp_func *func;
1659         char objname[64];
1660         struct acpi_buffer buffer = { .length = sizeof(objname),
1661                                       .pointer = objname };
1662
1663         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1664
1665         func = (struct acpiphp_func *)context;
1666
1667         switch (type) {
1668         case ACPI_NOTIFY_BUS_CHECK:
1669                 /* bus re-enumerate */
1670                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1671                 acpiphp_enable_slot(func->slot);
1672                 break;
1673
1674         case ACPI_NOTIFY_DEVICE_CHECK:
1675                 /* device check : re-enumerate from parent bus */
1676                 dbg("%s: Device check notify on %s\n", __func__, objname);
1677                 acpiphp_check_bridge(func->slot->bridge);
1678                 break;
1679
1680         case ACPI_NOTIFY_DEVICE_WAKE:
1681                 /* wake event */
1682                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1683                 break;
1684
1685         case ACPI_NOTIFY_EJECT_REQUEST:
1686                 /* request device eject */
1687                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1688                 if (!(acpiphp_disable_slot(func->slot)))
1689                         acpiphp_eject_slot(func->slot);
1690                 break;
1691
1692         default:
1693                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1694                 break;
1695         }
1696 }
1697
1698
1699 static acpi_status
1700 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1701 {
1702         int *count = (int *)context;
1703
1704         if (acpi_root_bridge(handle)) {
1705                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1706                                 handle_hotplug_event_bridge, NULL);
1707                         (*count)++;
1708         }
1709         return AE_OK ;
1710 }
1711
1712 static struct acpi_pci_driver acpi_pci_hp_driver = {
1713         .add =          add_bridge,
1714         .remove =       remove_bridge,
1715 };
1716
1717 /**
1718  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1719  */
1720 int __init acpiphp_glue_init(void)
1721 {
1722         int num = 0;
1723
1724         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1725                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1726
1727         if (num <= 0)
1728                 return -1;
1729         else
1730                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1731
1732         return 0;
1733 }
1734
1735
1736 /**
1737  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1738  *
1739  * This function frees all data allocated in acpiphp_glue_init().
1740  */
1741 void  acpiphp_glue_exit(void)
1742 {
1743         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1744 }
1745
1746
1747 /**
1748  * acpiphp_get_num_slots - count number of slots in a system
1749  */
1750 int __init acpiphp_get_num_slots(void)
1751 {
1752         struct acpiphp_bridge *bridge;
1753         int num_slots = 0;
1754
1755         list_for_each_entry (bridge, &bridge_list, list) {
1756                 dbg("Bus %04x:%02x has %d slot%s\n",
1757                                 pci_domain_nr(bridge->pci_bus),
1758                                 bridge->pci_bus->number, bridge->nr_slots,
1759                                 bridge->nr_slots == 1 ? "" : "s");
1760                 num_slots += bridge->nr_slots;
1761         }
1762
1763         dbg("Total %d slots\n", num_slots);
1764         return num_slots;
1765 }
1766
1767
1768 #if 0
1769 /**
1770  * acpiphp_for_each_slot - call function for each slot
1771  * @fn: callback function
1772  * @data: context to be passed to callback function
1773  */
1774 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1775 {
1776         struct list_head *node;
1777         struct acpiphp_bridge *bridge;
1778         struct acpiphp_slot *slot;
1779         int retval = 0;
1780
1781         list_for_each (node, &bridge_list) {
1782                 bridge = (struct acpiphp_bridge *)node;
1783                 for (slot = bridge->slots; slot; slot = slot->next) {
1784                         retval = fn(slot, data);
1785                         if (!retval)
1786                                 goto err_exit;
1787                 }
1788         }
1789
1790  err_exit:
1791         return retval;
1792 }
1793 #endif
1794
1795
1796 /**
1797  * acpiphp_enable_slot - power on slot
1798  * @slot: ACPI PHP slot
1799  */
1800 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1801 {
1802         int retval;
1803
1804         mutex_lock(&slot->crit_sect);
1805
1806         /* wake up all functions */
1807         retval = power_on_slot(slot);
1808         if (retval)
1809                 goto err_exit;
1810
1811         if (get_slot_status(slot) == ACPI_STA_ALL) {
1812                 /* configure all functions */
1813                 retval = enable_device(slot);
1814                 if (retval)
1815                         power_off_slot(slot);
1816         } else {
1817                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1818                 power_off_slot(slot);
1819         }
1820
1821  err_exit:
1822         mutex_unlock(&slot->crit_sect);
1823         return retval;
1824 }
1825
1826 /**
1827  * acpiphp_disable_slot - power off slot
1828  * @slot: ACPI PHP slot
1829  */
1830 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1831 {
1832         int retval = 0;
1833
1834         mutex_lock(&slot->crit_sect);
1835
1836         /* unconfigure all functions */
1837         retval = disable_device(slot);
1838         if (retval)
1839                 goto err_exit;
1840
1841         /* power off all functions */
1842         retval = power_off_slot(slot);
1843         if (retval)
1844                 goto err_exit;
1845
1846  err_exit:
1847         mutex_unlock(&slot->crit_sect);
1848         return retval;
1849 }
1850
1851
1852 /*
1853  * slot enabled:  1
1854  * slot disabled: 0
1855  */
1856 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1857 {
1858         return (slot->flags & SLOT_POWEREDON);
1859 }
1860
1861
1862 /*
1863  * latch   open:  1
1864  * latch closed:  0
1865  */
1866 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1867 {
1868         unsigned int sta;
1869
1870         sta = get_slot_status(slot);
1871
1872         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1873 }
1874
1875
1876 /*
1877  * adapter presence : 1
1878  *          absence : 0
1879  */
1880 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1881 {
1882         unsigned int sta;
1883
1884         sta = get_slot_status(slot);
1885
1886         return (sta == 0) ? 0 : 1;
1887 }