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  *  - When a P2P bridge is present, we elevate the refcount on the subordinate
  42  *    bus. It loses the refcount when the the driver unloads.
  43  */
  44
  45 #include <linux/init.h>
  46 #include <linux/module.h>
  47
  48 #include <linux/kernel.h>
  49 #include <linux/pci.h>
  50 #include <linux/pci_hotplug.h>
  51 #include <linux/pci-acpi.h>
  52 #include <linux/mutex.h>
  53
  54 #include "../pci.h"
  55 #include "acpiphp.h"
  56
  57 static LIST_HEAD(bridge_list);
  58 static LIST_HEAD(ioapic_list);
  59 static DEFINE_SPINLOCK(ioapic_list_lock);
  60
  61 #define MY_NAME "acpiphp_glue"
  62
  63 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
  64 static void acpiphp_sanitize_bus(struct pci_bus *bus);
  65 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
  66 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
  67
  68 /* callback routine to check for the existence of a pci dock device */
  69 static acpi_status
  70 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
  71 {
  72         int *count = (int *)context;
  73
  74         if (is_dock_device(handle)) {
  75                 (*count)++;
  76                 return AE_CTRL_TERMINATE;
  77         } else {
  78                 return AE_OK;
  79         }
  80 }
  81
  82 /*
  83  * the _DCK method can do funny things... and sometimes not
  84  * hah-hah funny.
  85  *
  86  * TBD - figure out a way to only call fixups for
  87  * systems that require them.
  88  */
  89 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
  90         void *v)
  91 {
  92         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
  93         struct pci_bus *bus = func->slot->bridge->pci_bus;
  94         u32 buses;
  95
  96         if (!bus->self)
  97                 return  NOTIFY_OK;
  98
  99         /* fixup bad _DCK function that rewrites
 100          * secondary bridge on slot
 101          */
 102         pci_read_config_dword(bus->self,
 103                         PCI_PRIMARY_BUS,
 104                         &buses);
 105
 106         if (((buses >> 8) & 0xff) != bus->secondary) {
 107                 buses = (buses & 0xff000000)
 108                         | ((unsigned int)(bus->primary)     <<  0)
 109                         | ((unsigned int)(bus->secondary)   <<  8)
 110                         | ((unsigned int)(bus->subordinate) << 16);
 111                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
 112         }
 113         return NOTIFY_OK;
 114 }
 115
 116
 117 static struct acpi_dock_ops acpiphp_dock_ops = {
 118         .handler = handle_hotplug_event_func,
 119 };
 120
 121 /* callback routine to register each ACPI PCI slot object */
 122 static acpi_status
 123 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 124 {
 125         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 126         struct acpiphp_slot *slot;
 127         struct acpiphp_func *newfunc;
 128         acpi_handle tmp;
 129         acpi_status status = AE_OK;
 130         unsigned long long adr, sun;
 131         int device, function, retval;
 132         struct pci_bus *pbus = bridge->pci_bus;
 133
 134         if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
 135                 return AE_OK;
 136
 137         acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 138         device = (adr >> 16) & 0xffff;
 139         function = adr & 0xffff;
 140
 141         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 142         if (!newfunc)
 143                 return AE_NO_MEMORY;
 144
 145         INIT_LIST_HEAD(&newfunc->sibling);
 146         newfunc->handle = handle;
 147         newfunc->function = function;
 148
 149         if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
 150                 newfunc->flags = FUNC_HAS_EJ0;
 151
 152         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 153                 newfunc->flags |= FUNC_HAS_STA;
 154
 155         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 156                 newfunc->flags |= FUNC_HAS_PS0;
 157
 158         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 159                 newfunc->flags |= FUNC_HAS_PS3;
 160
 161         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 162                 newfunc->flags |= FUNC_HAS_DCK;
 163
 164         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 165         if (ACPI_FAILURE(status)) {
 166                 /*
 167                  * use the count of the number of slots we've found
 168                  * for the number of the slot
 169                  */
 170                 sun = bridge->nr_slots+1;
 171         }
 172
 173         /* search for objects that share the same slot */
 174         for (slot = bridge->slots; slot; slot = slot->next)
 175                 if (slot->device == device) {
 176                         if (slot->sun != sun)
 177                                 warn("sibling found, but _SUN doesn't match!\n");
 178                         break;
 179                 }
 180
 181         if (!slot) {
 182                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 183                 if (!slot) {
 184                         kfree(newfunc);
 185                         return AE_NO_MEMORY;
 186                 }
 187
 188                 slot->bridge = bridge;
 189                 slot->device = device;
 190                 slot->sun = sun;
 191                 INIT_LIST_HEAD(&slot->funcs);
 192                 mutex_init(&slot->crit_sect);
 193
 194                 slot->next = bridge->slots;
 195                 bridge->slots = slot;
 196
 197                 bridge->nr_slots++;
 198
 199                 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
 200                     slot->sun, pci_domain_nr(pbus), pbus->number, device);
 201                 retval = acpiphp_register_hotplug_slot(slot);
 202                 if (retval) {
 203                         if (retval == -EBUSY)
 204                                 warn("Slot %llu already registered by another "
 205                                         "hotplug driver\n", slot->sun);
 206                         else
 207                                 warn("acpiphp_register_hotplug_slot failed "
 208                                         "(err code = 0x%x)\n", retval);
 209                         goto err_exit;
 210                 }
 211         }
 212
 213         newfunc->slot = slot;
 214         list_add_tail(&newfunc->sibling, &slot->funcs);
 215
 216         /* associate corresponding pci_dev */
 217         newfunc->pci_dev = pci_get_slot(pbus, PCI_DEVFN(device, function));
 218         if (newfunc->pci_dev) {
 219                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 220         }
 221
 222         if (is_dock_device(handle)) {
 223                 /* we don't want to call this device's _EJ0
 224                  * because we want the dock notify handler
 225                  * to call it after it calls _DCK
 226                  */
 227                 newfunc->flags &= ~FUNC_HAS_EJ0;
 228                 if (register_hotplug_dock_device(handle,
 229                         &acpiphp_dock_ops, newfunc))
 230                         dbg("failed to register dock device\n");
 231
 232                 /* we need to be notified when dock events happen
 233                  * outside of the hotplug operation, since we may
 234                  * need to do fixups before we can hotplug.
 235                  */
 236                 newfunc->nb.notifier_call = post_dock_fixups;
 237                 if (register_dock_notifier(&newfunc->nb))
 238                         dbg("failed to register a dock notifier");
 239         }
 240
 241         /* install notify handler */
 242         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 243                 status = acpi_install_notify_handler(handle,
 244                                              ACPI_SYSTEM_NOTIFY,
 245                                              handle_hotplug_event_func,
 246                                              newfunc);
 247
 248                 if (ACPI_FAILURE(status))
 249                         err("failed to register interrupt notify handler\n");
 250         } else
 251                 status = AE_OK;
 252
 253         return status;
 254
 255  err_exit:
 256         bridge->nr_slots--;
 257         bridge->slots = slot->next;
 258         kfree(slot);
 259         kfree(newfunc);
 260
 261         return AE_OK;
 262 }
 263
 264
 265 /* see if it's worth looking at this bridge */
 266 static int detect_ejectable_slots(struct pci_bus *pbus)
 267 {
 268         int found = acpi_pci_detect_ejectable(pbus);
 269         if (!found) {
 270                 acpi_handle bridge_handle = acpi_pci_get_bridge_handle(pbus);
 271                 if (!bridge_handle)
 272                         return 0;
 273                 acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 274                                     is_pci_dock_device, (void *)&found, NULL);
 275         }
 276         return found;
 277 }
 278
 279
 280 /* decode ACPI 2.0 _HPP hot plug parameters */
 281 static void decode_hpp(struct acpiphp_bridge *bridge)
 282 {
 283         acpi_status status;
 284
 285         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 286         if (ACPI_FAILURE(status) ||
 287             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 288                 /* use default numbers */
 289                 printk(KERN_WARNING
 290                        "%s: Could not get hotplug parameters. Use defaults\n",
 291                        __func__);
 292                 bridge->hpp.t0 = &bridge->hpp.type0_data;
 293                 bridge->hpp.t0->revision = 0;
 294                 bridge->hpp.t0->cache_line_size = 0x10;
 295                 bridge->hpp.t0->latency_timer = 0x40;
 296                 bridge->hpp.t0->enable_serr = 0;
 297                 bridge->hpp.t0->enable_perr = 0;
 298         }
 299 }
 300
 301
 302
 303 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 304 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 305 {
 306         acpi_status status;
 307
 308         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 309         decode_hpp(bridge);
 310
 311         /* must be added to the list prior to calling register_slot */
 312         list_add(&bridge->list, &bridge_list);
 313
 314         /* register all slot objects under this bridge */
 315         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 316                                      register_slot, bridge, NULL);
 317         if (ACPI_FAILURE(status)) {
 318                 list_del(&bridge->list);
 319                 return;
 320         }
 321
 322         /* install notify handler */
 323         if (bridge->type != BRIDGE_TYPE_HOST) {
 324                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 325                         status = acpi_remove_notify_handler(bridge->func->handle,
 326                                                 ACPI_SYSTEM_NOTIFY,
 327                                                 handle_hotplug_event_func);
 328                         if (ACPI_FAILURE(status))
 329                                 err("failed to remove notify handler\n");
 330                 }
 331                 status = acpi_install_notify_handler(bridge->handle,
 332                                              ACPI_SYSTEM_NOTIFY,
 333                                              handle_hotplug_event_bridge,
 334                                              bridge);
 335
 336                 if (ACPI_FAILURE(status)) {
 337                         err("failed to register interrupt notify handler\n");
 338                 }
 339         }
 340 }
 341
 342
 343 /* find acpiphp_func from acpiphp_bridge */
 344 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 345 {
 346         struct list_head *node, *l;
 347         struct acpiphp_bridge *bridge;
 348         struct acpiphp_slot *slot;
 349         struct acpiphp_func *func;
 350
 351         list_for_each(node, &bridge_list) {
 352                 bridge = list_entry(node, struct acpiphp_bridge, list);
 353                 for (slot = bridge->slots; slot; slot = slot->next) {
 354                         list_for_each(l, &slot->funcs) {
 355                                 func = list_entry(l, struct acpiphp_func,
 356                                                         sibling);
 357                                 if (func->handle == handle)
 358                                         return func;
 359                         }
 360                 }
 361         }
 362
 363         return NULL;
 364 }
 365
 366
 367 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 368 {
 369         acpi_handle dummy_handle;
 370
 371         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 372                                         "_STA", &dummy_handle)))
 373                 bridge->flags |= BRIDGE_HAS_STA;
 374
 375         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 376                                         "_EJ0", &dummy_handle)))
 377                 bridge->flags |= BRIDGE_HAS_EJ0;
 378
 379         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 380                                         "_PS0", &dummy_handle)))
 381                 bridge->flags |= BRIDGE_HAS_PS0;
 382
 383         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 384                                         "_PS3", &dummy_handle)))
 385                 bridge->flags |= BRIDGE_HAS_PS3;
 386
 387         /* is this ejectable p2p bridge? */
 388         if (bridge->flags & BRIDGE_HAS_EJ0) {
 389                 struct acpiphp_func *func;
 390
 391                 dbg("found ejectable p2p bridge\n");
 392
 393                 /* make link between PCI bridge and PCI function */
 394                 func = acpiphp_bridge_handle_to_function(bridge->handle);
 395                 if (!func)
 396                         return;
 397                 bridge->func = func;
 398                 func->bridge = bridge;
 399         }
 400 }
 401
 402
 403 /* allocate and initialize host bridge data structure */
 404 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 405 {
 406         struct acpiphp_bridge *bridge;
 407
 408         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 409         if (bridge == NULL)
 410                 return;
 411
 412         bridge->type = BRIDGE_TYPE_HOST;
 413         bridge->handle = handle;
 414
 415         bridge->pci_bus = pci_bus;
 416
 417         spin_lock_init(&bridge->res_lock);
 418
 419         init_bridge_misc(bridge);
 420 }
 421
 422
 423 /* allocate and initialize PCI-to-PCI bridge data structure */
 424 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 425 {
 426         struct acpiphp_bridge *bridge;
 427
 428         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 429         if (bridge == NULL) {
 430                 err("out of memory\n");
 431                 return;
 432         }
 433
 434         bridge->type = BRIDGE_TYPE_P2P;
 435         bridge->handle = handle;
 436         config_p2p_bridge_flags(bridge);
 437
 438         bridge->pci_dev = pci_dev_get(pci_dev);
 439         bridge->pci_bus = pci_dev->subordinate;
 440         if (!bridge->pci_bus) {
 441                 err("This is not a PCI-to-PCI bridge!\n");
 442                 goto err;
 443         }
 444
 445         /*
 446          * Grab a ref to the subordinate PCI bus in case the bus is
 447          * removed via PCI core logical hotplug. The ref pins the bus
 448          * (which we access during module unload).
 449          */
 450         get_device(&bridge->pci_bus->dev);
 451         spin_lock_init(&bridge->res_lock);
 452
 453         init_bridge_misc(bridge);
 454         return;
 455  err:
 456         pci_dev_put(pci_dev);
 457         kfree(bridge);
 458         return;
 459 }
 460
 461
 462 /* callback routine to find P2P bridges */
 463 static acpi_status
 464 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 465 {
 466         acpi_status status;
 467         acpi_handle dummy_handle;
 468         unsigned long long tmp;
 469         int device, function;
 470         struct pci_dev *dev;
 471         struct pci_bus *pci_bus = context;
 472
 473         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 474         if (ACPI_FAILURE(status))
 475                 return AE_OK;           /* continue */
 476
 477         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 478         if (ACPI_FAILURE(status)) {
 479                 dbg("%s: _ADR evaluation failure\n", __func__);
 480                 return AE_OK;
 481         }
 482
 483         device = (tmp >> 16) & 0xffff;
 484         function = tmp & 0xffff;
 485
 486         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 487
 488         if (!dev || !dev->subordinate)
 489                 goto out;
 490
 491         /* check if this bridge has ejectable slots */
 492         if ((detect_ejectable_slots(dev->subordinate) > 0)) {
 493                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 494                 add_p2p_bridge(handle, dev);
 495         }
 496
 497         /* search P2P bridges under this p2p bridge */
 498         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 499                                      find_p2p_bridge, dev->subordinate, NULL);
 500         if (ACPI_FAILURE(status))
 501                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 502
 503  out:
 504         pci_dev_put(dev);
 505         return AE_OK;
 506 }
 507
 508
 509 /* find hot-pluggable slots, and then find P2P bridge */
 510 static int add_bridge(acpi_handle handle)
 511 {
 512         acpi_status status;
 513         unsigned long long tmp;
 514         int seg, bus;
 515         acpi_handle dummy_handle;
 516         struct pci_bus *pci_bus;
 517
 518         /* if the bridge doesn't have _STA, we assume it is always there */
 519         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 520         if (ACPI_SUCCESS(status)) {
 521                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 522                 if (ACPI_FAILURE(status)) {
 523                         dbg("%s: _STA evaluation failure\n", __func__);
 524                         return 0;
 525                 }
 526                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 527                         /* don't register this object */
 528                         return 0;
 529         }
 530
 531         /* get PCI segment number */
 532         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 533
 534         seg = ACPI_SUCCESS(status) ? tmp : 0;
 535
 536         /* get PCI bus number */
 537         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 538
 539         if (ACPI_SUCCESS(status)) {
 540                 bus = tmp;
 541         } else {
 542                 warn("can't get bus number, assuming 0\n");
 543                 bus = 0;
 544         }
 545
 546         pci_bus = pci_find_bus(seg, bus);
 547         if (!pci_bus) {
 548                 err("Can't find bus %04x:%02x\n", seg, bus);
 549                 return 0;
 550         }
 551
 552         /* check if this bridge has ejectable slots */
 553         if (detect_ejectable_slots(pci_bus) > 0) {
 554                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 555                 add_host_bridge(handle, pci_bus);
 556         }
 557
 558         /* search P2P bridges under this host bridge */
 559         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 560                                      find_p2p_bridge, pci_bus, NULL);
 561
 562         if (ACPI_FAILURE(status))
 563                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 564
 565         return 0;
 566 }
 567
 568 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 569 {
 570         struct list_head *head;
 571         list_for_each(head, &bridge_list) {
 572                 struct acpiphp_bridge *bridge = list_entry(head,
 573                                                 struct acpiphp_bridge, list);
 574                 if (bridge->handle == handle)
 575                         return bridge;
 576         }
 577
 578         return NULL;
 579 }
 580
 581 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 582 {
 583         struct list_head *list, *tmp;
 584         struct acpiphp_slot *slot;
 585         acpi_status status;
 586         acpi_handle handle = bridge->handle;
 587
 588         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 589                                             handle_hotplug_event_bridge);
 590         if (ACPI_FAILURE(status))
 591                 err("failed to remove notify handler\n");
 592
 593         if ((bridge->type != BRIDGE_TYPE_HOST) &&
 594             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
 595                 status = acpi_install_notify_handler(bridge->func->handle,
 596                                                 ACPI_SYSTEM_NOTIFY,
 597                                                 handle_hotplug_event_func,
 598                                                 bridge->func);
 599                 if (ACPI_FAILURE(status))
 600                         err("failed to install interrupt notify handler\n");
 601         }
 602
 603         slot = bridge->slots;
 604         while (slot) {
 605                 struct acpiphp_slot *next = slot->next;
 606                 list_for_each_safe (list, tmp, &slot->funcs) {
 607                         struct acpiphp_func *func;
 608                         func = list_entry(list, struct acpiphp_func, sibling);
 609                         if (is_dock_device(func->handle)) {
 610                                 unregister_hotplug_dock_device(func->handle);
 611                                 unregister_dock_notifier(&func->nb);
 612                         }
 613                         if (!(func->flags & FUNC_HAS_DCK)) {
 614                                 status = acpi_remove_notify_handler(func->handle,
 615                                                 ACPI_SYSTEM_NOTIFY,
 616                                                 handle_hotplug_event_func);
 617                                 if (ACPI_FAILURE(status))
 618                                         err("failed to remove notify handler\n");
 619                         }
 620                         pci_dev_put(func->pci_dev);
 621                         list_del(list);
 622                         kfree(func);
 623                 }
 624                 acpiphp_unregister_hotplug_slot(slot);
 625                 list_del(&slot->funcs);
 626                 kfree(slot);
 627                 slot = next;
 628         }
 629
 630         /*
 631          * Only P2P bridges have a pci_dev
 632          */
 633         if (bridge->pci_dev)
 634                 put_device(&bridge->pci_bus->dev);
 635
 636         pci_dev_put(bridge->pci_dev);
 637         list_del(&bridge->list);
 638         kfree(bridge);
 639 }
 640
 641 static acpi_status
 642 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 643 {
 644         struct acpiphp_bridge *bridge;
 645
 646         /* cleanup p2p bridges under this P2P bridge
 647            in a depth-first manner */
 648         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 649                                 cleanup_p2p_bridge, NULL, NULL);
 650
 651         bridge = acpiphp_handle_to_bridge(handle);
 652         if (bridge)
 653                 cleanup_bridge(bridge);
 654
 655         return AE_OK;
 656 }
 657
 658 static void remove_bridge(acpi_handle handle)
 659 {
 660         struct acpiphp_bridge *bridge;
 661
 662         /* cleanup p2p bridges under this host bridge
 663            in a depth-first manner */
 664         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 665                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 666
 667         /*
 668          * On root bridges with hotplug slots directly underneath (ie,
 669          * no p2p bridge inbetween), we call cleanup_bridge().
 670          *
 671          * The else clause cleans up root bridges that either had no
 672          * hotplug slots at all, or had a p2p bridge underneath.
 673          */
 674         bridge = acpiphp_handle_to_bridge(handle);
 675         if (bridge)
 676                 cleanup_bridge(bridge);
 677         else
 678                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 679                                            handle_hotplug_event_bridge);
 680 }
 681
 682 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 683 {
 684         struct acpi_pci_id id;
 685         struct pci_bus *bus;
 686         struct pci_dev *dev;
 687
 688         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 689                 return NULL;
 690
 691         bus = pci_find_bus(id.segment, id.bus);
 692         if (!bus)
 693                 return NULL;
 694
 695         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 696         if (!dev)
 697                 return NULL;
 698
 699         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 700             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 701         {
 702                 pci_dev_put(dev);
 703                 return NULL;
 704         }
 705
 706         return dev;
 707 }
 708
 709 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 710 {
 711         acpi_status status;
 712         int result = -1;
 713         unsigned long long gsb;
 714         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 715         union acpi_object *obj;
 716         void *table;
 717
 718         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 719         if (ACPI_SUCCESS(status)) {
 720                 *gsi_base = (u32)gsb;
 721                 return 0;
 722         }
 723
 724         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 725         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 726                 return -1;
 727
 728         obj = buffer.pointer;
 729         if (obj->type != ACPI_TYPE_BUFFER)
 730                 goto out;
 731
 732         table = obj->buffer.pointer;
 733         switch (((struct acpi_subtable_header *)table)->type) {
 734         case ACPI_MADT_TYPE_IO_SAPIC:
 735                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
 736                 result = 0;
 737                 break;
 738         case ACPI_MADT_TYPE_IO_APIC:
 739                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
 740                 result = 0;
 741                 break;
 742         default:
 743                 break;
 744         }
 745  out:
 746         kfree(buffer.pointer);
 747         return result;
 748 }
 749
 750 static acpi_status
 751 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 752 {
 753         acpi_status status;
 754         unsigned long long sta;
 755         acpi_handle tmp;
 756         struct pci_dev *pdev;
 757         u32 gsi_base;
 758         u64 phys_addr;
 759         struct acpiphp_ioapic *ioapic;
 760
 761         /* Evaluate _STA if present */
 762         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 763         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 764                 return AE_CTRL_DEPTH;
 765
 766         /* Scan only PCI bus scope */
 767         status = acpi_get_handle(handle, "_HID", &tmp);
 768         if (ACPI_SUCCESS(status))
 769                 return AE_CTRL_DEPTH;
 770
 771         if (get_gsi_base(handle, &gsi_base))
 772                 return AE_OK;
 773
 774         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 775         if (!ioapic)
 776                 return AE_NO_MEMORY;
 777
 778         pdev = get_apic_pci_info(handle);
 779         if (!pdev)
 780                 goto exit_kfree;
 781
 782         if (pci_enable_device(pdev))
 783                 goto exit_pci_dev_put;
 784
 785         pci_set_master(pdev);
 786
 787         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 788                 goto exit_pci_disable_device;
 789
 790         phys_addr = pci_resource_start(pdev, 0);
 791         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 792                 goto exit_pci_release_region;
 793
 794         ioapic->gsi_base = gsi_base;
 795         ioapic->dev = pdev;
 796         spin_lock(&ioapic_list_lock);
 797         list_add_tail(&ioapic->list, &ioapic_list);
 798         spin_unlock(&ioapic_list_lock);
 799
 800         return AE_OK;
 801
 802  exit_pci_release_region:
 803         pci_release_region(pdev, 0);
 804  exit_pci_disable_device:
 805         pci_disable_device(pdev);
 806  exit_pci_dev_put:
 807         pci_dev_put(pdev);
 808  exit_kfree:
 809         kfree(ioapic);
 810
 811         return AE_OK;
 812 }
 813
 814 static acpi_status
 815 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 816 {
 817         acpi_status status;
 818         unsigned long long sta;
 819         acpi_handle tmp;
 820         u32 gsi_base;
 821         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 822
 823         /* Evaluate _STA if present */
 824         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 825         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 826                 return AE_CTRL_DEPTH;
 827
 828         /* Scan only PCI bus scope */
 829         status = acpi_get_handle(handle, "_HID", &tmp);
 830         if (ACPI_SUCCESS(status))
 831                 return AE_CTRL_DEPTH;
 832
 833         if (get_gsi_base(handle, &gsi_base))
 834                 return AE_OK;
 835
 836         acpi_unregister_ioapic(handle, gsi_base);
 837
 838         spin_lock(&ioapic_list_lock);
 839         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 840                 if (pos->gsi_base != gsi_base)
 841                         continue;
 842                 ioapic = pos;
 843                 list_del(&ioapic->list);
 844                 break;
 845         }
 846         spin_unlock(&ioapic_list_lock);
 847
 848         if (!ioapic)
 849                 return AE_OK;
 850
 851         pci_release_region(ioapic->dev, 0);
 852         pci_disable_device(ioapic->dev);
 853         pci_dev_put(ioapic->dev);
 854         kfree(ioapic);
 855
 856         return AE_OK;
 857 }
 858
 859 static int acpiphp_configure_ioapics(acpi_handle handle)
 860 {
 861         ioapic_add(handle, 0, NULL, NULL);
 862         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 863                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 864         return 0;
 865 }
 866
 867 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 868 {
 869         ioapic_remove(handle, 0, NULL, NULL);
 870         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 871                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 872         return 0;
 873 }
 874
 875 static int power_on_slot(struct acpiphp_slot *slot)
 876 {
 877         acpi_status status;
 878         struct acpiphp_func *func;
 879         struct list_head *l;
 880         int retval = 0;
 881
 882         /* if already enabled, just skip */
 883         if (slot->flags & SLOT_POWEREDON)
 884                 goto err_exit;
 885
 886         list_for_each (l, &slot->funcs) {
 887                 func = list_entry(l, struct acpiphp_func, sibling);
 888
 889                 if (func->flags & FUNC_HAS_PS0) {
 890                         dbg("%s: executing _PS0\n", __func__);
 891                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 892                         if (ACPI_FAILURE(status)) {
 893                                 warn("%s: _PS0 failed\n", __func__);
 894                                 retval = -1;
 895                                 goto err_exit;
 896                         } else
 897                                 break;
 898                 }
 899         }
 900
 901         /* TBD: evaluate _STA to check if the slot is enabled */
 902
 903         slot->flags |= SLOT_POWEREDON;
 904
 905  err_exit:
 906         return retval;
 907 }
 908
 909
 910 static int power_off_slot(struct acpiphp_slot *slot)
 911 {
 912         acpi_status status;
 913         struct acpiphp_func *func;
 914         struct list_head *l;
 915
 916         int retval = 0;
 917
 918         /* if already disabled, just skip */
 919         if ((slot->flags & SLOT_POWEREDON) == 0)
 920                 goto err_exit;
 921
 922         list_for_each (l, &slot->funcs) {
 923                 func = list_entry(l, struct acpiphp_func, sibling);
 924
 925                 if (func->flags & FUNC_HAS_PS3) {
 926                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 927                         if (ACPI_FAILURE(status)) {
 928                                 warn("%s: _PS3 failed\n", __func__);
 929                                 retval = -1;
 930                                 goto err_exit;
 931                         } else
 932                                 break;
 933                 }
 934         }
 935
 936         /* TBD: evaluate _STA to check if the slot is disabled */
 937
 938         slot->flags &= (~SLOT_POWEREDON);
 939
 940  err_exit:
 941         return retval;
 942 }
 943
 944
 945
 946 /**
 947  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
 948  * @bus: bus to start search with
 949  */
 950 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
 951 {
 952         struct list_head *tmp;
 953         unsigned char max, n;
 954
 955         /*
 956          * pci_bus_max_busnr will return the highest
 957          * reserved busnr for all these children.
 958          * that is equivalent to the bus->subordinate
 959          * value.  We don't want to use the parent's
 960          * bus->subordinate value because it could have
 961          * padding in it.
 962          */
 963         max = bus->secondary;
 964
 965         list_for_each(tmp, &bus->children) {
 966                 n = pci_bus_max_busnr(pci_bus_b(tmp));
 967                 if (n > max)
 968                         max = n;
 969         }
 970         return max;
 971 }
 972
 973
 974 /**
 975  * acpiphp_bus_add - add a new bus to acpi subsystem
 976  * @func: acpiphp_func of the bridge
 977  */
 978 static int acpiphp_bus_add(struct acpiphp_func *func)
 979 {
 980         acpi_handle phandle;
 981         struct acpi_device *device, *pdevice;
 982         int ret_val;
 983
 984         acpi_get_parent(func->handle, &phandle);
 985         if (acpi_bus_get_device(phandle, &pdevice)) {
 986                 dbg("no parent device, assuming NULL\n");
 987                 pdevice = NULL;
 988         }
 989         if (!acpi_bus_get_device(func->handle, &device)) {
 990                 dbg("bus exists... trim\n");
 991                 /* this shouldn't be in here, so remove
 992                  * the bus then re-add it...
 993                  */
 994                 ret_val = acpi_bus_trim(device, 1);
 995                 dbg("acpi_bus_trim return %x\n", ret_val);
 996         }
 997
 998         ret_val = acpi_bus_add(&device, pdevice, func->handle,
 999                 ACPI_BUS_TYPE_DEVICE);
1000         if (ret_val) {
1001                 dbg("error adding bus, %x\n",
1002                         -ret_val);
1003                 goto acpiphp_bus_add_out;
1004         }
1005         /*
1006          * try to start anyway.  We could have failed to add
1007          * simply because this bus had previously been added
1008          * on another add.  Don't bother with the return value
1009          * we just keep going.
1010          */
1011         ret_val = acpi_bus_start(device);
1012
1013 acpiphp_bus_add_out:
1014         return ret_val;
1015 }
1016
1017
1018 /**
1019  * acpiphp_bus_trim - trim a bus from acpi subsystem
1020  * @handle: handle to acpi namespace
1021  */
1022 static int acpiphp_bus_trim(acpi_handle handle)
1023 {
1024         struct acpi_device *device;
1025         int retval;
1026
1027         retval = acpi_bus_get_device(handle, &device);
1028         if (retval) {
1029                 dbg("acpi_device not found\n");
1030                 return retval;
1031         }
1032
1033         retval = acpi_bus_trim(device, 1);
1034         if (retval)
1035                 err("cannot remove from acpi list\n");
1036
1037         return retval;
1038 }
1039
1040 /**
1041  * enable_device - enable, configure a slot
1042  * @slot: slot to be enabled
1043  *
1044  * This function should be called per *physical slot*,
1045  * not per each slot object in ACPI namespace.
1046  */
1047 static int __ref enable_device(struct acpiphp_slot *slot)
1048 {
1049         struct pci_dev *dev;
1050         struct pci_bus *bus = slot->bridge->pci_bus;
1051         struct list_head *l;
1052         struct acpiphp_func *func;
1053         int retval = 0;
1054         int num, max, pass;
1055         acpi_status status;
1056
1057         if (slot->flags & SLOT_ENABLED)
1058                 goto err_exit;
1059
1060         /* sanity check: dev should be NULL when hot-plugged in */
1061         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1062         if (dev) {
1063                 /* This case shouldn't happen */
1064                 err("pci_dev structure already exists.\n");
1065                 pci_dev_put(dev);
1066                 retval = -1;
1067                 goto err_exit;
1068         }
1069
1070         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1071         if (num == 0) {
1072                 err("No new device found\n");
1073                 retval = -1;
1074                 goto err_exit;
1075         }
1076
1077         max = acpiphp_max_busnr(bus);
1078         for (pass = 0; pass < 2; pass++) {
1079                 list_for_each_entry(dev, &bus->devices, bus_list) {
1080                         if (PCI_SLOT(dev->devfn) != slot->device)
1081                                 continue;
1082                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1083                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1084                                 max = pci_scan_bridge(bus, dev, max, pass);
1085                                 if (pass && dev->subordinate)
1086                                         pci_bus_size_bridges(dev->subordinate);
1087                         }
1088                 }
1089         }
1090
1091         list_for_each (l, &slot->funcs) {
1092                 func = list_entry(l, struct acpiphp_func, sibling);
1093                 acpiphp_bus_add(func);
1094         }
1095
1096         pci_bus_assign_resources(bus);
1097         acpiphp_sanitize_bus(bus);
1098         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1099         list_for_each_entry(func, &slot->funcs, sibling)
1100                 acpiphp_configure_ioapics(func->handle);
1101         pci_enable_bridges(bus);
1102         pci_bus_add_devices(bus);
1103
1104         /* associate pci_dev to our representation */
1105         list_for_each (l, &slot->funcs) {
1106                 func = list_entry(l, struct acpiphp_func, sibling);
1107                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1108                                                         func->function));
1109                 if (!func->pci_dev)
1110                         continue;
1111
1112                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1113                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1114                         continue;
1115
1116                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1117                 if (ACPI_FAILURE(status))
1118                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1119                                 status);
1120         }
1121
1122         slot->flags |= SLOT_ENABLED;
1123
1124  err_exit:
1125         return retval;
1126 }
1127
1128 static void disable_bridges(struct pci_bus *bus)
1129 {
1130         struct pci_dev *dev;
1131         list_for_each_entry(dev, &bus->devices, bus_list) {
1132                 if (dev->subordinate) {
1133                         disable_bridges(dev->subordinate);
1134                         pci_disable_device(dev);
1135                 }
1136         }
1137 }
1138
1139 /**
1140  * disable_device - disable a slot
1141  * @slot: ACPI PHP slot
1142  */
1143 static int disable_device(struct acpiphp_slot *slot)
1144 {
1145         int retval = 0;
1146         struct acpiphp_func *func;
1147         struct list_head *l;
1148
1149         /* is this slot already disabled? */
1150         if (!(slot->flags & SLOT_ENABLED))
1151                 goto err_exit;
1152
1153         list_for_each (l, &slot->funcs) {
1154                 func = list_entry(l, struct acpiphp_func, sibling);
1155
1156                 if (func->bridge) {
1157                         /* cleanup p2p bridges under this P2P bridge */
1158                         cleanup_p2p_bridge(func->bridge->handle,
1159                                                 (u32)1, NULL, NULL);
1160                         func->bridge = NULL;
1161                 }
1162
1163                 if (func->pci_dev) {
1164                         pci_stop_bus_device(func->pci_dev);
1165                         if (func->pci_dev->subordinate) {
1166                                 disable_bridges(func->pci_dev->subordinate);
1167                                 pci_disable_device(func->pci_dev);
1168                         }
1169                 }
1170         }
1171
1172         list_for_each (l, &slot->funcs) {
1173                 func = list_entry(l, struct acpiphp_func, sibling);
1174
1175                 acpiphp_unconfigure_ioapics(func->handle);
1176                 acpiphp_bus_trim(func->handle);
1177                 /* try to remove anyway.
1178                  * acpiphp_bus_add might have been failed */
1179
1180                 if (!func->pci_dev)
1181                         continue;
1182
1183                 pci_remove_bus_device(func->pci_dev);
1184                 pci_dev_put(func->pci_dev);
1185                 func->pci_dev = NULL;
1186         }
1187
1188         slot->flags &= (~SLOT_ENABLED);
1189
1190  err_exit:
1191         return retval;
1192 }
1193
1194
1195 /**
1196  * get_slot_status - get ACPI slot status
1197  * @slot: ACPI PHP slot
1198  *
1199  * If a slot has _STA for each function and if any one of them
1200  * returned non-zero status, return it.
1201  *
1202  * If a slot doesn't have _STA and if any one of its functions'
1203  * configuration space is configured, return 0x0f as a _STA.
1204  *
1205  * Otherwise return 0.
1206  */
1207 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1208 {
1209         acpi_status status;
1210         unsigned long long sta = 0;
1211         u32 dvid;
1212         struct list_head *l;
1213         struct acpiphp_func *func;
1214
1215         list_for_each (l, &slot->funcs) {
1216                 func = list_entry(l, struct acpiphp_func, sibling);
1217
1218                 if (func->flags & FUNC_HAS_STA) {
1219                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1220                         if (ACPI_SUCCESS(status) && sta)
1221                                 break;
1222                 } else {
1223                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1224                                                   PCI_DEVFN(slot->device,
1225                                                             func->function),
1226                                                   PCI_VENDOR_ID, &dvid);
1227                         if (dvid != 0xffffffff) {
1228                                 sta = ACPI_STA_ALL;
1229                                 break;
1230                         }
1231                 }
1232         }
1233
1234         return (unsigned int)sta;
1235 }
1236
1237 /**
1238  * acpiphp_eject_slot - physically eject the slot
1239  * @slot: ACPI PHP slot
1240  */
1241 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1242 {
1243         acpi_status status;
1244         struct acpiphp_func *func;
1245         struct list_head *l;
1246         struct acpi_object_list arg_list;
1247         union acpi_object arg;
1248
1249         list_for_each (l, &slot->funcs) {
1250                 func = list_entry(l, struct acpiphp_func, sibling);
1251
1252                 /* We don't want to call _EJ0 on non-existing functions. */
1253                 if ((func->flags & FUNC_HAS_EJ0)) {
1254                         /* _EJ0 method take one argument */
1255                         arg_list.count = 1;
1256                         arg_list.pointer = &arg;
1257                         arg.type = ACPI_TYPE_INTEGER;
1258                         arg.integer.value = 1;
1259
1260                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1261                         if (ACPI_FAILURE(status)) {
1262                                 warn("%s: _EJ0 failed\n", __func__);
1263                                 return -1;
1264                         } else
1265                                 break;
1266                 }
1267         }
1268         return 0;
1269 }
1270
1271 /**
1272  * acpiphp_check_bridge - re-enumerate devices
1273  * @bridge: where to begin re-enumeration
1274  *
1275  * Iterate over all slots under this bridge and make sure that if a
1276  * card is present they are enabled, and if not they are disabled.
1277  */
1278 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1279 {
1280         struct acpiphp_slot *slot;
1281         int retval = 0;
1282         int enabled, disabled;
1283
1284         enabled = disabled = 0;
1285
1286         for (slot = bridge->slots; slot; slot = slot->next) {
1287                 unsigned int status = get_slot_status(slot);
1288                 if (slot->flags & SLOT_ENABLED) {
1289                         if (status == ACPI_STA_ALL)
1290                                 continue;
1291                         retval = acpiphp_disable_slot(slot);
1292                         if (retval) {
1293                                 err("Error occurred in disabling\n");
1294                                 goto err_exit;
1295                         } else {
1296                                 acpiphp_eject_slot(slot);
1297                         }
1298                         disabled++;
1299                 } else {
1300                         if (status != ACPI_STA_ALL)
1301                                 continue;
1302                         retval = acpiphp_enable_slot(slot);
1303                         if (retval) {
1304                                 err("Error occurred in enabling\n");
1305                                 goto err_exit;
1306                         }
1307                         enabled++;
1308                 }
1309         }
1310
1311         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1312
1313  err_exit:
1314         return retval;
1315 }
1316
1317 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1318 {
1319         u16 pci_cmd, pci_bctl;
1320         struct pci_dev *cdev;
1321
1322         /* Program hpp values for this device */
1323         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1324                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1325                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1326                 return;
1327
1328         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1329                 return;
1330
1331         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1332                         bridge->hpp.t0->cache_line_size);
1333         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1334                         bridge->hpp.t0->latency_timer);
1335         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1336         if (bridge->hpp.t0->enable_serr)
1337                 pci_cmd |= PCI_COMMAND_SERR;
1338         else
1339                 pci_cmd &= ~PCI_COMMAND_SERR;
1340         if (bridge->hpp.t0->enable_perr)
1341                 pci_cmd |= PCI_COMMAND_PARITY;
1342         else
1343                 pci_cmd &= ~PCI_COMMAND_PARITY;
1344         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1345
1346         /* Program bridge control value and child devices */
1347         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1348                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1349                                 bridge->hpp.t0->latency_timer);
1350                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1351                 if (bridge->hpp.t0->enable_serr)
1352                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1353                 else
1354                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1355                 if (bridge->hpp.t0->enable_perr)
1356                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1357                 else
1358                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1359                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1360                 if (dev->subordinate) {
1361                         list_for_each_entry(cdev, &dev->subordinate->devices,
1362                                         bus_list)
1363                                 program_hpp(cdev, bridge);
1364                 }
1365         }
1366 }
1367
1368 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1369 {
1370         struct acpiphp_bridge bridge;
1371         struct pci_dev *dev;
1372
1373         memset(&bridge, 0, sizeof(bridge));
1374         bridge.handle = handle;
1375         bridge.pci_bus = bus;
1376         bridge.pci_dev = bus->self;
1377         decode_hpp(&bridge);
1378         list_for_each_entry(dev, &bus->devices, bus_list)
1379                 program_hpp(dev, &bridge);
1380
1381 }
1382
1383 /*
1384  * Remove devices for which we could not assign resources, call
1385  * arch specific code to fix-up the bus
1386  */
1387 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1388 {
1389         struct pci_dev *dev;
1390         int i;
1391         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1392
1393         list_for_each_entry(dev, &bus->devices, bus_list) {
1394                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1395                         struct resource *res = &dev->resource[i];
1396                         if ((res->flags & type_mask) && !res->start &&
1397                                         res->end) {
1398                                 /* Could not assign a required resources
1399                                  * for this device, remove it */
1400                                 pci_remove_bus_device(dev);
1401                                 break;
1402                         }
1403                 }
1404         }
1405 }
1406
1407 /* Program resources in newly inserted bridge */
1408 static int acpiphp_configure_bridge (acpi_handle handle)
1409 {
1410         struct acpi_pci_id pci_id;
1411         struct pci_bus *bus;
1412
1413         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1414                 err("cannot get PCI domain and bus number for bridge\n");
1415                 return -EINVAL;
1416         }
1417         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1418         if (!bus) {
1419                 err("cannot find bus %d:%d\n",
1420                                 pci_id.segment, pci_id.bus);
1421                 return -EINVAL;
1422         }
1423
1424         pci_bus_size_bridges(bus);
1425         pci_bus_assign_resources(bus);
1426         acpiphp_sanitize_bus(bus);
1427         acpiphp_set_hpp_values(handle, bus);
1428         pci_enable_bridges(bus);
1429         acpiphp_configure_ioapics(handle);
1430         return 0;
1431 }
1432
1433 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1434 {
1435         struct acpi_device *device, *pdevice;
1436         acpi_handle phandle;
1437
1438         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1439                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1440                 err("unexpected notification type %d\n", type);
1441                 return;
1442         }
1443
1444         acpi_get_parent(handle, &phandle);
1445         if (acpi_bus_get_device(phandle, &pdevice)) {
1446                 dbg("no parent device, assuming NULL\n");
1447                 pdevice = NULL;
1448         }
1449         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1450                 err("cannot add bridge to acpi list\n");
1451                 return;
1452         }
1453         if (!acpiphp_configure_bridge(handle) &&
1454                 !acpi_bus_start(device))
1455                 add_bridge(handle);
1456         else
1457                 err("cannot configure and start bridge\n");
1458
1459 }
1460
1461 /*
1462  * ACPI event handlers
1463  */
1464
1465 static acpi_status
1466 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1467 {
1468         int *count = (int *)context;
1469         struct acpiphp_bridge *bridge;
1470
1471         bridge = acpiphp_handle_to_bridge(handle);
1472         if (bridge)
1473                 (*count)++;
1474         return AE_OK ;
1475 }
1476
1477 static acpi_status
1478 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1479 {
1480         struct acpiphp_bridge *bridge;
1481         char objname[64];
1482         struct acpi_buffer buffer = { .length = sizeof(objname),
1483                                       .pointer = objname };
1484
1485         bridge = acpiphp_handle_to_bridge(handle);
1486         if (bridge) {
1487                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1488                 dbg("%s: re-enumerating slots under %s\n",
1489                         __func__, objname);
1490                 acpiphp_check_bridge(bridge);
1491         }
1492         return AE_OK ;
1493 }
1494
1495 /**
1496  * handle_hotplug_event_bridge - handle ACPI event on bridges
1497  * @handle: Notify()'ed acpi_handle
1498  * @type: Notify code
1499  * @context: pointer to acpiphp_bridge structure
1500  *
1501  * Handles ACPI event notification on {host,p2p} bridges.
1502  */
1503 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1504 {
1505         struct acpiphp_bridge *bridge;
1506         char objname[64];
1507         struct acpi_buffer buffer = { .length = sizeof(objname),
1508                                       .pointer = objname };
1509         struct acpi_device *device;
1510         int num_sub_bridges = 0;
1511
1512         if (acpi_bus_get_device(handle, &device)) {
1513                 /* This bridge must have just been physically inserted */
1514                 handle_bridge_insertion(handle, type);
1515                 return;
1516         }
1517
1518         bridge = acpiphp_handle_to_bridge(handle);
1519         if (type == ACPI_NOTIFY_BUS_CHECK) {
1520                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1521                         count_sub_bridges, &num_sub_bridges, NULL);
1522         }
1523
1524         if (!bridge && !num_sub_bridges) {
1525                 err("cannot get bridge info\n");
1526                 return;
1527         }
1528
1529         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1530
1531         switch (type) {
1532         case ACPI_NOTIFY_BUS_CHECK:
1533                 /* bus re-enumerate */
1534                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1535                 if (bridge) {
1536                         dbg("%s: re-enumerating slots under %s\n",
1537                                 __func__, objname);
1538                         acpiphp_check_bridge(bridge);
1539                 }
1540                 if (num_sub_bridges)
1541                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1542                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1543                 break;
1544
1545         case ACPI_NOTIFY_DEVICE_CHECK:
1546                 /* device check */
1547                 dbg("%s: Device check notify on %s\n", __func__, objname);
1548                 acpiphp_check_bridge(bridge);
1549                 break;
1550
1551         case ACPI_NOTIFY_DEVICE_WAKE:
1552                 /* wake event */
1553                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1554                 break;
1555
1556         case ACPI_NOTIFY_EJECT_REQUEST:
1557                 /* request device eject */
1558                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1559                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1560                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1561                         struct acpiphp_slot *slot;
1562                         slot = bridge->func->slot;
1563                         if (!acpiphp_disable_slot(slot))
1564                                 acpiphp_eject_slot(slot);
1565                 }
1566                 break;
1567
1568         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1569                 printk(KERN_ERR "Device %s cannot be configured due"
1570                                 " to a frequency mismatch\n", objname);
1571                 break;
1572
1573         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1574                 printk(KERN_ERR "Device %s cannot be configured due"
1575                                 " to a bus mode mismatch\n", objname);
1576                 break;
1577
1578         case ACPI_NOTIFY_POWER_FAULT:
1579                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1580                                 objname);
1581                 break;
1582
1583         default:
1584                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1585                 break;
1586         }
1587 }
1588
1589 /**
1590  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1591  * @handle: Notify()'ed acpi_handle
1592  * @type: Notify code
1593  * @context: pointer to acpiphp_func structure
1594  *
1595  * Handles ACPI event notification on slots.
1596  */
1597 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1598 {
1599         struct acpiphp_func *func;
1600         char objname[64];
1601         struct acpi_buffer buffer = { .length = sizeof(objname),
1602                                       .pointer = objname };
1603
1604         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1605
1606         func = (struct acpiphp_func *)context;
1607
1608         switch (type) {
1609         case ACPI_NOTIFY_BUS_CHECK:
1610                 /* bus re-enumerate */
1611                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1612                 acpiphp_enable_slot(func->slot);
1613                 break;
1614
1615         case ACPI_NOTIFY_DEVICE_CHECK:
1616                 /* device check : re-enumerate from parent bus */
1617                 dbg("%s: Device check notify on %s\n", __func__, objname);
1618                 acpiphp_check_bridge(func->slot->bridge);
1619                 break;
1620
1621         case ACPI_NOTIFY_DEVICE_WAKE:
1622                 /* wake event */
1623                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1624                 break;
1625
1626         case ACPI_NOTIFY_EJECT_REQUEST:
1627                 /* request device eject */
1628                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1629                 if (!(acpiphp_disable_slot(func->slot)))
1630                         acpiphp_eject_slot(func->slot);
1631                 break;
1632
1633         default:
1634                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1635                 break;
1636         }
1637 }
1638
1639
1640 static acpi_status
1641 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1642 {
1643         int *count = (int *)context;
1644
1645         if (acpi_root_bridge(handle)) {
1646                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1647                                 handle_hotplug_event_bridge, NULL);
1648                         (*count)++;
1649         }
1650         return AE_OK ;
1651 }
1652
1653 static struct acpi_pci_driver acpi_pci_hp_driver = {
1654         .add =          add_bridge,
1655         .remove =       remove_bridge,
1656 };
1657
1658 /**
1659  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1660  */
1661 int __init acpiphp_glue_init(void)
1662 {
1663         int num = 0;
1664
1665         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1666                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1667
1668         if (num <= 0)
1669                 return -1;
1670         else
1671                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1672
1673         return 0;
1674 }
1675
1676
1677 /**
1678  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1679  *
1680  * This function frees all data allocated in acpiphp_glue_init().
1681  */
1682 void  acpiphp_glue_exit(void)
1683 {
1684         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1685 }
1686
1687
1688 /**
1689  * acpiphp_get_num_slots - count number of slots in a system
1690  */
1691 int __init acpiphp_get_num_slots(void)
1692 {
1693         struct acpiphp_bridge *bridge;
1694         int num_slots = 0;
1695
1696         list_for_each_entry (bridge, &bridge_list, list) {
1697                 dbg("Bus %04x:%02x has %d slot%s\n",
1698                                 pci_domain_nr(bridge->pci_bus),
1699                                 bridge->pci_bus->number, bridge->nr_slots,
1700                                 bridge->nr_slots == 1 ? "" : "s");
1701                 num_slots += bridge->nr_slots;
1702         }
1703
1704         dbg("Total %d slots\n", num_slots);
1705         return num_slots;
1706 }
1707
1708
1709 #if 0
1710 /**
1711  * acpiphp_for_each_slot - call function for each slot
1712  * @fn: callback function
1713  * @data: context to be passed to callback function
1714  */
1715 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1716 {
1717         struct list_head *node;
1718         struct acpiphp_bridge *bridge;
1719         struct acpiphp_slot *slot;
1720         int retval = 0;
1721
1722         list_for_each (node, &bridge_list) {
1723                 bridge = (struct acpiphp_bridge *)node;
1724                 for (slot = bridge->slots; slot; slot = slot->next) {
1725                         retval = fn(slot, data);
1726                         if (!retval)
1727                                 goto err_exit;
1728                 }
1729         }
1730
1731  err_exit:
1732         return retval;
1733 }
1734 #endif
1735
1736
1737 /**
1738  * acpiphp_enable_slot - power on slot
1739  * @slot: ACPI PHP slot
1740  */
1741 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1742 {
1743         int retval;
1744
1745         mutex_lock(&slot->crit_sect);
1746
1747         /* wake up all functions */
1748         retval = power_on_slot(slot);
1749         if (retval)
1750                 goto err_exit;
1751
1752         if (get_slot_status(slot) == ACPI_STA_ALL) {
1753                 /* configure all functions */
1754                 retval = enable_device(slot);
1755                 if (retval)
1756                         power_off_slot(slot);
1757         } else {
1758                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1759                 power_off_slot(slot);
1760         }
1761
1762  err_exit:
1763         mutex_unlock(&slot->crit_sect);
1764         return retval;
1765 }
1766
1767 /**
1768  * acpiphp_disable_slot - power off slot
1769  * @slot: ACPI PHP slot
1770  */
1771 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1772 {
1773         int retval = 0;
1774
1775         mutex_lock(&slot->crit_sect);
1776
1777         /* unconfigure all functions */
1778         retval = disable_device(slot);
1779         if (retval)
1780                 goto err_exit;
1781
1782         /* power off all functions */
1783         retval = power_off_slot(slot);
1784         if (retval)
1785                 goto err_exit;
1786
1787  err_exit:
1788         mutex_unlock(&slot->crit_sect);
1789         return retval;
1790 }
1791
1792
1793 /*
1794  * slot enabled:  1
1795  * slot disabled: 0
1796  */
1797 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1798 {
1799         return (slot->flags & SLOT_POWEREDON);
1800 }
1801
1802
1803 /*
1804  * latch   open:  1
1805  * latch closed:  0
1806  */
1807 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1808 {
1809         unsigned int sta;
1810
1811         sta = get_slot_status(slot);
1812
1813         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1814 }
1815
1816
1817 /*
1818  * adapter presence : 1
1819  *          absence : 0
1820  */
1821 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1822 {
1823         unsigned int sta;
1824
1825         sta = get_slot_status(slot);
1826
1827         return (sta == 0) ? 0 : 1;
1828 }