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