drivers/pci/hotplug/acpiphp_glue.c

   1 /*
   2  * ACPI PCI HotPlug glue functions to ACPI CA subsystem
   3  *
   4  * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
   5  * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
   6  * Copyright (C) 2002,2003 NEC Corporation
   7  * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
   8  * Copyright (C) 2003-2005 Hewlett Packard
   9  * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
  10  * Copyright (C) 2005 Intel Corporation
  11  *
  12  * All rights reserved.
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or (at
  17  * your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  22  * NON INFRINGEMENT.  See the GNU General Public License for more
  23  * details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  *
  29  * Send feedback to <kristen.c.accardi@intel.com>
  30  *
  31  */
  32
  33 /*
  34  * Lifetime rules for pci_dev:
  35  *  - The one in acpiphp_func has its refcount elevated by pci_get_slot()
  36  *    when the driver is loaded or when an insertion event occurs.  It loses
  37  *    a refcount when its ejected or the driver unloads.
  38  *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
  39  *    when the bridge is scanned and it loses a refcount when the bridge
  40  *    is removed.
  41  */
  42
  43 #include <linux/init.h>
  44 #include <linux/module.h>
  45
  46 #include <linux/kernel.h>
  47 #include <linux/pci.h>
  48 #include <linux/pci_hotplug.h>
  49 #include <linux/mutex.h>
  50
  51 #include "../pci.h"
  52 #include "acpiphp.h"
  53
  54 static LIST_HEAD(bridge_list);
  55 static LIST_HEAD(ioapic_list);
  56 static DEFINE_SPINLOCK(ioapic_list_lock);
  57
  58 #define MY_NAME "acpiphp_glue"
  59
  60 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
  61 static void acpiphp_sanitize_bus(struct pci_bus *bus);
  62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
  63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
  64
  65
  66 /*
  67  * initialization & terminatation routines
  68  */
  69
  70 /**
  71  * is_ejectable - determine if a slot is ejectable
  72  * @handle: handle to acpi namespace
  73  *
  74  * Ejectable slot should satisfy at least these conditions:
  75  *
  76  *  1. has _ADR method
  77  *  2. has _EJ0 method
  78  *
  79  * optionally
  80  *
  81  *  1. has _STA method
  82  *  2. has _PS0 method
  83  *  3. has _PS3 method
  84  *  4. ..
  85  */
  86 static int is_ejectable(acpi_handle handle)
  87 {
  88         acpi_status status;
  89         acpi_handle tmp;
  90
  91         status = acpi_get_handle(handle, "_ADR", &tmp);
  92         if (ACPI_FAILURE(status)) {
  93                 return 0;
  94         }
  95
  96         status = acpi_get_handle(handle, "_EJ0", &tmp);
  97         if (ACPI_FAILURE(status)) {
  98                 return 0;
  99         }
 100
 101         return 1;
 102 }
 103
 104
 105 /* callback routine to check for the existence of ejectable slots */
 106 static acpi_status
 107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 108 {
 109         int *count = (int *)context;
 110
 111         if (is_ejectable(handle)) {
 112                 (*count)++;
 113                 /* only one ejectable slot is enough */
 114                 return AE_CTRL_TERMINATE;
 115         } else {
 116                 return AE_OK;
 117         }
 118 }
 119
 120 /* callback routine to check for the existence of a pci dock device */
 121 static acpi_status
 122 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 123 {
 124         int *count = (int *)context;
 125
 126         if (is_dock_device(handle)) {
 127                 (*count)++;
 128                 return AE_CTRL_TERMINATE;
 129         } else {
 130                 return AE_OK;
 131         }
 132 }
 133
 134
 135
 136
 137 /*
 138  * the _DCK method can do funny things... and sometimes not
 139  * hah-hah funny.
 140  *
 141  * TBD - figure out a way to only call fixups for
 142  * systems that require them.
 143  */
 144 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
 145         void *v)
 146 {
 147         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
 148         struct pci_bus *bus = func->slot->bridge->pci_bus;
 149         u32 buses;
 150
 151         if (!bus->self)
 152                 return  NOTIFY_OK;
 153
 154         /* fixup bad _DCK function that rewrites
 155          * secondary bridge on slot
 156          */
 157         pci_read_config_dword(bus->self,
 158                         PCI_PRIMARY_BUS,
 159                         &buses);
 160
 161         if (((buses >> 8) & 0xff) != bus->secondary) {
 162                 buses = (buses & 0xff000000)
 163                         | ((unsigned int)(bus->primary)     <<  0)
 164                         | ((unsigned int)(bus->secondary)   <<  8)
 165                         | ((unsigned int)(bus->subordinate) << 16);
 166                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
 167         }
 168         return NOTIFY_OK;
 169 }
 170
 171
 172
 173
 174 /* callback routine to register each ACPI PCI slot object */
 175 static acpi_status
 176 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 177 {
 178         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 179         struct acpiphp_slot *slot;
 180         struct acpiphp_func *newfunc;
 181         acpi_handle tmp;
 182         acpi_status status = AE_OK;
 183         unsigned long adr, sun;
 184         int device, function, retval;
 185
 186         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 187
 188         if (ACPI_FAILURE(status))
 189                 return AE_OK;
 190
 191         status = acpi_get_handle(handle, "_EJ0", &tmp);
 192
 193         if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
 194                 return AE_OK;
 195
 196         device = (adr >> 16) & 0xffff;
 197         function = adr & 0xffff;
 198
 199         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 200         if (!newfunc)
 201                 return AE_NO_MEMORY;
 202
 203         INIT_LIST_HEAD(&newfunc->sibling);
 204         newfunc->handle = handle;
 205         newfunc->function = function;
 206         if (ACPI_SUCCESS(status))
 207                 newfunc->flags = FUNC_HAS_EJ0;
 208
 209         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 210                 newfunc->flags |= FUNC_HAS_STA;
 211
 212         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 213                 newfunc->flags |= FUNC_HAS_PS0;
 214
 215         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 216                 newfunc->flags |= FUNC_HAS_PS3;
 217
 218         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 219                 newfunc->flags |= FUNC_HAS_DCK;
 220
 221         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 222         if (ACPI_FAILURE(status)) {
 223                 /*
 224                  * use the count of the number of slots we've found
 225                  * for the number of the slot
 226                  */
 227                 sun = bridge->nr_slots+1;
 228         }
 229
 230         /* search for objects that share the same slot */
 231         for (slot = bridge->slots; slot; slot = slot->next)
 232                 if (slot->device == device) {
 233                         if (slot->sun != sun)
 234                                 warn("sibling found, but _SUN doesn't match!\n");
 235                         break;
 236                 }
 237
 238         if (!slot) {
 239                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 240                 if (!slot) {
 241                         kfree(newfunc);
 242                         return AE_NO_MEMORY;
 243                 }
 244
 245                 slot->bridge = bridge;
 246                 slot->device = device;
 247                 slot->sun = sun;
 248                 INIT_LIST_HEAD(&slot->funcs);
 249                 mutex_init(&slot->crit_sect);
 250
 251                 slot->next = bridge->slots;
 252                 bridge->slots = slot;
 253
 254                 bridge->nr_slots++;
 255
 256                 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 257                                 slot->sun, pci_domain_nr(bridge->pci_bus),
 258                                 bridge->pci_bus->number, slot->device);
 259                 retval = acpiphp_register_hotplug_slot(slot);
 260                 if (retval) {
 261                         warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
 262                         goto err_exit;
 263                 }
 264         }
 265
 266         newfunc->slot = slot;
 267         list_add_tail(&newfunc->sibling, &slot->funcs);
 268
 269         /* associate corresponding pci_dev */
 270         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 271                                          PCI_DEVFN(device, function));
 272         if (newfunc->pci_dev) {
 273                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 274         }
 275
 276         if (is_dock_device(handle)) {
 277                 /* we don't want to call this device's _EJ0
 278                  * because we want the dock notify handler
 279                  * to call it after it calls _DCK
 280                  */
 281                 newfunc->flags &= ~FUNC_HAS_EJ0;
 282                 if (register_hotplug_dock_device(handle,
 283                         handle_hotplug_event_func, newfunc))
 284                         dbg("failed to register dock device\n");
 285
 286                 /* we need to be notified when dock events happen
 287                  * outside of the hotplug operation, since we may
 288                  * need to do fixups before we can hotplug.
 289                  */
 290                 newfunc->nb.notifier_call = post_dock_fixups;
 291                 if (register_dock_notifier(&newfunc->nb))
 292                         dbg("failed to register a dock notifier");
 293         }
 294
 295         /* install notify handler */
 296         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 297                 status = acpi_install_notify_handler(handle,
 298                                              ACPI_SYSTEM_NOTIFY,
 299                                              handle_hotplug_event_func,
 300                                              newfunc);
 301
 302                 if (ACPI_FAILURE(status))
 303                         err("failed to register interrupt notify handler\n");
 304         } else
 305                 status = AE_OK;
 306
 307         return status;
 308
 309  err_exit:
 310         bridge->nr_slots--;
 311         bridge->slots = slot->next;
 312         kfree(slot);
 313         kfree(newfunc);
 314
 315         return AE_OK;
 316 }
 317
 318
 319 /* see if it's worth looking at this bridge */
 320 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 321 {
 322         acpi_status status;
 323         int count;
 324
 325         count = 0;
 326
 327         /* only check slots defined directly below bridge object */
 328         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 329                                      is_ejectable_slot, (void *)&count, NULL);
 330
 331         /*
 332          * we also need to add this bridge if there is a dock bridge or
 333          * other pci device on a dock station (removable)
 334          */
 335         if (!count)
 336                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
 337                                 (u32)1, is_pci_dock_device, (void *)&count,
 338                                 NULL);
 339
 340         return count;
 341 }
 342
 343
 344 /* decode ACPI 2.0 _HPP hot plug parameters */
 345 static void decode_hpp(struct acpiphp_bridge *bridge)
 346 {
 347         acpi_status status;
 348
 349         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 350         if (ACPI_FAILURE(status) ||
 351             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 352                 /* use default numbers */
 353                 printk(KERN_WARNING
 354                        "%s: Could not get hotplug parameters. Use defaults\n",
 355                        __func__);
 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", __func__);
 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", __func__);
 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         bridge = acpiphp_handle_to_bridge(handle);
 704         if (bridge)
 705                 cleanup_bridge(bridge);
 706
 707         return AE_OK;
 708 }
 709
 710 static void remove_bridge(acpi_handle handle)
 711 {
 712         struct acpiphp_bridge *bridge;
 713
 714         /* cleanup p2p bridges under this host bridge
 715            in a depth-first manner */
 716         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 717                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 718
 719         /*
 720          * On root bridges with hotplug slots directly underneath (ie,
 721          * no p2p bridge inbetween), we call cleanup_bridge().
 722          *
 723          * The else clause cleans up root bridges that either had no
 724          * hotplug slots at all, or had a p2p bridge underneath.
 725          */
 726         bridge = acpiphp_handle_to_bridge(handle);
 727         if (bridge)
 728                 cleanup_bridge(bridge);
 729         else
 730                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 731                                            handle_hotplug_event_bridge);
 732 }
 733
 734 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 735 {
 736         struct acpi_pci_id id;
 737         struct pci_bus *bus;
 738         struct pci_dev *dev;
 739
 740         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 741                 return NULL;
 742
 743         bus = pci_find_bus(id.segment, id.bus);
 744         if (!bus)
 745                 return NULL;
 746
 747         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 748         if (!dev)
 749                 return NULL;
 750
 751         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 752             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 753         {
 754                 pci_dev_put(dev);
 755                 return NULL;
 756         }
 757
 758         return dev;
 759 }
 760
 761 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 762 {
 763         acpi_status status;
 764         int result = -1;
 765         unsigned long gsb;
 766         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 767         union acpi_object *obj;
 768         void *table;
 769
 770         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 771         if (ACPI_SUCCESS(status)) {
 772                 *gsi_base = (u32)gsb;
 773                 return 0;
 774         }
 775
 776         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 777         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 778                 return -1;
 779
 780         obj = buffer.pointer;
 781         if (obj->type != ACPI_TYPE_BUFFER)
 782                 goto out;
 783
 784         table = obj->buffer.pointer;
 785         switch (((struct acpi_subtable_header *)table)->type) {
 786         case ACPI_MADT_TYPE_IO_SAPIC:
 787                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
 788                 result = 0;
 789                 break;
 790         case ACPI_MADT_TYPE_IO_APIC:
 791                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
 792                 result = 0;
 793                 break;
 794         default:
 795                 break;
 796         }
 797  out:
 798         kfree(buffer.pointer);
 799         return result;
 800 }
 801
 802 static acpi_status
 803 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 804 {
 805         acpi_status status;
 806         unsigned long sta;
 807         acpi_handle tmp;
 808         struct pci_dev *pdev;
 809         u32 gsi_base;
 810         u64 phys_addr;
 811         struct acpiphp_ioapic *ioapic;
 812
 813         /* Evaluate _STA if present */
 814         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 815         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 816                 return AE_CTRL_DEPTH;
 817
 818         /* Scan only PCI bus scope */
 819         status = acpi_get_handle(handle, "_HID", &tmp);
 820         if (ACPI_SUCCESS(status))
 821                 return AE_CTRL_DEPTH;
 822
 823         if (get_gsi_base(handle, &gsi_base))
 824                 return AE_OK;
 825
 826         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 827         if (!ioapic)
 828                 return AE_NO_MEMORY;
 829
 830         pdev = get_apic_pci_info(handle);
 831         if (!pdev)
 832                 goto exit_kfree;
 833
 834         if (pci_enable_device(pdev))
 835                 goto exit_pci_dev_put;
 836
 837         pci_set_master(pdev);
 838
 839         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 840                 goto exit_pci_disable_device;
 841
 842         phys_addr = pci_resource_start(pdev, 0);
 843         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 844                 goto exit_pci_release_region;
 845
 846         ioapic->gsi_base = gsi_base;
 847         ioapic->dev = pdev;
 848         spin_lock(&ioapic_list_lock);
 849         list_add_tail(&ioapic->list, &ioapic_list);
 850         spin_unlock(&ioapic_list_lock);
 851
 852         return AE_OK;
 853
 854  exit_pci_release_region:
 855         pci_release_region(pdev, 0);
 856  exit_pci_disable_device:
 857         pci_disable_device(pdev);
 858  exit_pci_dev_put:
 859         pci_dev_put(pdev);
 860  exit_kfree:
 861         kfree(ioapic);
 862
 863         return AE_OK;
 864 }
 865
 866 static acpi_status
 867 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 868 {
 869         acpi_status status;
 870         unsigned long sta;
 871         acpi_handle tmp;
 872         u32 gsi_base;
 873         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 874
 875         /* Evaluate _STA if present */
 876         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 877         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 878                 return AE_CTRL_DEPTH;
 879
 880         /* Scan only PCI bus scope */
 881         status = acpi_get_handle(handle, "_HID", &tmp);
 882         if (ACPI_SUCCESS(status))
 883                 return AE_CTRL_DEPTH;
 884
 885         if (get_gsi_base(handle, &gsi_base))
 886                 return AE_OK;
 887
 888         acpi_unregister_ioapic(handle, gsi_base);
 889
 890         spin_lock(&ioapic_list_lock);
 891         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 892                 if (pos->gsi_base != gsi_base)
 893                         continue;
 894                 ioapic = pos;
 895                 list_del(&ioapic->list);
 896                 break;
 897         }
 898         spin_unlock(&ioapic_list_lock);
 899
 900         if (!ioapic)
 901                 return AE_OK;
 902
 903         pci_release_region(ioapic->dev, 0);
 904         pci_disable_device(ioapic->dev);
 905         pci_dev_put(ioapic->dev);
 906         kfree(ioapic);
 907
 908         return AE_OK;
 909 }
 910
 911 static int acpiphp_configure_ioapics(acpi_handle handle)
 912 {
 913         ioapic_add(handle, 0, NULL, NULL);
 914         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 915                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 916         return 0;
 917 }
 918
 919 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 920 {
 921         ioapic_remove(handle, 0, NULL, NULL);
 922         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 923                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 924         return 0;
 925 }
 926
 927 static int power_on_slot(struct acpiphp_slot *slot)
 928 {
 929         acpi_status status;
 930         struct acpiphp_func *func;
 931         struct list_head *l;
 932         int retval = 0;
 933
 934         /* if already enabled, just skip */
 935         if (slot->flags & SLOT_POWEREDON)
 936                 goto err_exit;
 937
 938         list_for_each (l, &slot->funcs) {
 939                 func = list_entry(l, struct acpiphp_func, sibling);
 940
 941                 if (func->flags & FUNC_HAS_PS0) {
 942                         dbg("%s: executing _PS0\n", __func__);
 943                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 944                         if (ACPI_FAILURE(status)) {
 945                                 warn("%s: _PS0 failed\n", __func__);
 946                                 retval = -1;
 947                                 goto err_exit;
 948                         } else
 949                                 break;
 950                 }
 951         }
 952
 953         /* TBD: evaluate _STA to check if the slot is enabled */
 954
 955         slot->flags |= SLOT_POWEREDON;
 956
 957  err_exit:
 958         return retval;
 959 }
 960
 961
 962 static int power_off_slot(struct acpiphp_slot *slot)
 963 {
 964         acpi_status status;
 965         struct acpiphp_func *func;
 966         struct list_head *l;
 967
 968         int retval = 0;
 969
 970         /* if already disabled, just skip */
 971         if ((slot->flags & SLOT_POWEREDON) == 0)
 972                 goto err_exit;
 973
 974         list_for_each (l, &slot->funcs) {
 975                 func = list_entry(l, struct acpiphp_func, sibling);
 976
 977                 if (func->flags & FUNC_HAS_PS3) {
 978                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 979                         if (ACPI_FAILURE(status)) {
 980                                 warn("%s: _PS3 failed\n", __func__);
 981                                 retval = -1;
 982                                 goto err_exit;
 983                         } else
 984                                 break;
 985                 }
 986         }
 987
 988         /* TBD: evaluate _STA to check if the slot is disabled */
 989
 990         slot->flags &= (~SLOT_POWEREDON);
 991
 992  err_exit:
 993         return retval;
 994 }
 995
 996
 997
 998 /**
 999  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
1000  * @bus: bus to start search with
1001  */
1002 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
1003 {
1004         struct list_head *tmp;
1005         unsigned char max, n;
1006
1007         /*
1008          * pci_bus_max_busnr will return the highest
1009          * reserved busnr for all these children.
1010          * that is equivalent to the bus->subordinate
1011          * value.  We don't want to use the parent's
1012          * bus->subordinate value because it could have
1013          * padding in it.
1014          */
1015         max = bus->secondary;
1016
1017         list_for_each(tmp, &bus->children) {
1018                 n = pci_bus_max_busnr(pci_bus_b(tmp));
1019                 if (n > max)
1020                         max = n;
1021         }
1022         return max;
1023 }
1024
1025
1026 /**
1027  * acpiphp_bus_add - add a new bus to acpi subsystem
1028  * @func: acpiphp_func of the bridge
1029  */
1030 static int acpiphp_bus_add(struct acpiphp_func *func)
1031 {
1032         acpi_handle phandle;
1033         struct acpi_device *device, *pdevice;
1034         int ret_val;
1035
1036         acpi_get_parent(func->handle, &phandle);
1037         if (acpi_bus_get_device(phandle, &pdevice)) {
1038                 dbg("no parent device, assuming NULL\n");
1039                 pdevice = NULL;
1040         }
1041         if (!acpi_bus_get_device(func->handle, &device)) {
1042                 dbg("bus exists... trim\n");
1043                 /* this shouldn't be in here, so remove
1044                  * the bus then re-add it...
1045                  */
1046                 ret_val = acpi_bus_trim(device, 1);
1047                 dbg("acpi_bus_trim return %x\n", ret_val);
1048         }
1049
1050         ret_val = acpi_bus_add(&device, pdevice, func->handle,
1051                 ACPI_BUS_TYPE_DEVICE);
1052         if (ret_val) {
1053                 dbg("error adding bus, %x\n",
1054                         -ret_val);
1055                 goto acpiphp_bus_add_out;
1056         }
1057         /*
1058          * try to start anyway.  We could have failed to add
1059          * simply because this bus had previously been added
1060          * on another add.  Don't bother with the return value
1061          * we just keep going.
1062          */
1063         ret_val = acpi_bus_start(device);
1064
1065 acpiphp_bus_add_out:
1066         return ret_val;
1067 }
1068
1069
1070 /**
1071  * acpiphp_bus_trim - trim a bus from acpi subsystem
1072  * @handle: handle to acpi namespace
1073  */
1074 static int acpiphp_bus_trim(acpi_handle handle)
1075 {
1076         struct acpi_device *device;
1077         int retval;
1078
1079         retval = acpi_bus_get_device(handle, &device);
1080         if (retval) {
1081                 dbg("acpi_device not found\n");
1082                 return retval;
1083         }
1084
1085         retval = acpi_bus_trim(device, 1);
1086         if (retval)
1087                 err("cannot remove from acpi list\n");
1088
1089         return retval;
1090 }
1091
1092 /**
1093  * enable_device - enable, configure a slot
1094  * @slot: slot to be enabled
1095  *
1096  * This function should be called per *physical slot*,
1097  * not per each slot object in ACPI namespace.
1098  */
1099 static int __ref enable_device(struct acpiphp_slot *slot)
1100 {
1101         struct pci_dev *dev;
1102         struct pci_bus *bus = slot->bridge->pci_bus;
1103         struct list_head *l;
1104         struct acpiphp_func *func;
1105         int retval = 0;
1106         int num, max, pass;
1107         acpi_status status;
1108
1109         if (slot->flags & SLOT_ENABLED)
1110                 goto err_exit;
1111
1112         /* sanity check: dev should be NULL when hot-plugged in */
1113         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1114         if (dev) {
1115                 /* This case shouldn't happen */
1116                 err("pci_dev structure already exists.\n");
1117                 pci_dev_put(dev);
1118                 retval = -1;
1119                 goto err_exit;
1120         }
1121
1122         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1123         if (num == 0) {
1124                 err("No new device found\n");
1125                 retval = -1;
1126                 goto err_exit;
1127         }
1128
1129         max = acpiphp_max_busnr(bus);
1130         for (pass = 0; pass < 2; pass++) {
1131                 list_for_each_entry(dev, &bus->devices, bus_list) {
1132                         if (PCI_SLOT(dev->devfn) != slot->device)
1133                                 continue;
1134                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1135                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1136                                 max = pci_scan_bridge(bus, dev, max, pass);
1137                                 if (pass && dev->subordinate)
1138                                         pci_bus_size_bridges(dev->subordinate);
1139                         }
1140                 }
1141         }
1142
1143         list_for_each (l, &slot->funcs) {
1144                 func = list_entry(l, struct acpiphp_func, sibling);
1145                 acpiphp_bus_add(func);
1146         }
1147
1148         pci_bus_assign_resources(bus);
1149         acpiphp_sanitize_bus(bus);
1150         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1151         list_for_each_entry(func, &slot->funcs, sibling)
1152                 acpiphp_configure_ioapics(func->handle);
1153         pci_enable_bridges(bus);
1154         pci_bus_add_devices(bus);
1155
1156         /* associate pci_dev to our representation */
1157         list_for_each (l, &slot->funcs) {
1158                 func = list_entry(l, struct acpiphp_func, sibling);
1159                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1160                                                         func->function));
1161                 if (!func->pci_dev)
1162                         continue;
1163
1164                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1165                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1166                         continue;
1167
1168                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1169                 if (ACPI_FAILURE(status))
1170                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1171                                 status);
1172         }
1173
1174         slot->flags |= SLOT_ENABLED;
1175
1176  err_exit:
1177         return retval;
1178 }
1179
1180 static void disable_bridges(struct pci_bus *bus)
1181 {
1182         struct pci_dev *dev;
1183         list_for_each_entry(dev, &bus->devices, bus_list) {
1184                 if (dev->subordinate) {
1185                         disable_bridges(dev->subordinate);
1186                         pci_disable_device(dev);
1187                 }
1188         }
1189 }
1190
1191 /**
1192  * disable_device - disable a slot
1193  * @slot: ACPI PHP slot
1194  */
1195 static int disable_device(struct acpiphp_slot *slot)
1196 {
1197         int retval = 0;
1198         struct acpiphp_func *func;
1199         struct list_head *l;
1200
1201         /* is this slot already disabled? */
1202         if (!(slot->flags & SLOT_ENABLED))
1203                 goto err_exit;
1204
1205         list_for_each (l, &slot->funcs) {
1206                 func = list_entry(l, struct acpiphp_func, sibling);
1207
1208                 if (func->bridge) {
1209                         /* cleanup p2p bridges under this P2P bridge */
1210                         cleanup_p2p_bridge(func->bridge->handle,
1211                                                 (u32)1, NULL, NULL);
1212                         func->bridge = NULL;
1213                 }
1214
1215                 if (func->pci_dev) {
1216                         pci_stop_bus_device(func->pci_dev);
1217                         if (func->pci_dev->subordinate) {
1218                                 disable_bridges(func->pci_dev->subordinate);
1219                                 pci_disable_device(func->pci_dev);
1220                         }
1221                 }
1222         }
1223
1224         list_for_each (l, &slot->funcs) {
1225                 func = list_entry(l, struct acpiphp_func, sibling);
1226
1227                 acpiphp_unconfigure_ioapics(func->handle);
1228                 acpiphp_bus_trim(func->handle);
1229                 /* try to remove anyway.
1230                  * acpiphp_bus_add might have been failed */
1231
1232                 if (!func->pci_dev)
1233                         continue;
1234
1235                 pci_remove_bus_device(func->pci_dev);
1236                 pci_dev_put(func->pci_dev);
1237                 func->pci_dev = NULL;
1238         }
1239
1240         slot->flags &= (~SLOT_ENABLED);
1241
1242  err_exit:
1243         return retval;
1244 }
1245
1246
1247 /**
1248  * get_slot_status - get ACPI slot status
1249  * @slot: ACPI PHP slot
1250  *
1251  * If a slot has _STA for each function and if any one of them
1252  * returned non-zero status, return it.
1253  *
1254  * If a slot doesn't have _STA and if any one of its functions'
1255  * configuration space is configured, return 0x0f as a _STA.
1256  *
1257  * Otherwise return 0.
1258  */
1259 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1260 {
1261         acpi_status status;
1262         unsigned long sta = 0;
1263         u32 dvid;
1264         struct list_head *l;
1265         struct acpiphp_func *func;
1266
1267         list_for_each (l, &slot->funcs) {
1268                 func = list_entry(l, struct acpiphp_func, sibling);
1269
1270                 if (func->flags & FUNC_HAS_STA) {
1271                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1272                         if (ACPI_SUCCESS(status) && sta)
1273                                 break;
1274                 } else {
1275                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1276                                                   PCI_DEVFN(slot->device,
1277                                                             func->function),
1278                                                   PCI_VENDOR_ID, &dvid);
1279                         if (dvid != 0xffffffff) {
1280                                 sta = ACPI_STA_ALL;
1281                                 break;
1282                         }
1283                 }
1284         }
1285
1286         return (unsigned int)sta;
1287 }
1288
1289 /**
1290  * acpiphp_eject_slot - physically eject the slot
1291  * @slot: ACPI PHP slot
1292  */
1293 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1294 {
1295         acpi_status status;
1296         struct acpiphp_func *func;
1297         struct list_head *l;
1298         struct acpi_object_list arg_list;
1299         union acpi_object arg;
1300
1301         list_for_each (l, &slot->funcs) {
1302                 func = list_entry(l, struct acpiphp_func, sibling);
1303
1304                 /* We don't want to call _EJ0 on non-existing functions. */
1305                 if ((func->flags & FUNC_HAS_EJ0)) {
1306                         /* _EJ0 method take one argument */
1307                         arg_list.count = 1;
1308                         arg_list.pointer = &arg;
1309                         arg.type = ACPI_TYPE_INTEGER;
1310                         arg.integer.value = 1;
1311
1312                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1313                         if (ACPI_FAILURE(status)) {
1314                                 warn("%s: _EJ0 failed\n", __func__);
1315                                 return -1;
1316                         } else
1317                                 break;
1318                 }
1319         }
1320         return 0;
1321 }
1322
1323 /**
1324  * acpiphp_check_bridge - re-enumerate devices
1325  * @bridge: where to begin re-enumeration
1326  *
1327  * Iterate over all slots under this bridge and make sure that if a
1328  * card is present they are enabled, and if not they are disabled.
1329  */
1330 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1331 {
1332         struct acpiphp_slot *slot;
1333         int retval = 0;
1334         int enabled, disabled;
1335
1336         enabled = disabled = 0;
1337
1338         for (slot = bridge->slots; slot; slot = slot->next) {
1339                 unsigned int status = get_slot_status(slot);
1340                 if (slot->flags & SLOT_ENABLED) {
1341                         if (status == ACPI_STA_ALL)
1342                                 continue;
1343                         retval = acpiphp_disable_slot(slot);
1344                         if (retval) {
1345                                 err("Error occurred in disabling\n");
1346                                 goto err_exit;
1347                         } else {
1348                                 acpiphp_eject_slot(slot);
1349                         }
1350                         disabled++;
1351                 } else {
1352                         if (status != ACPI_STA_ALL)
1353                                 continue;
1354                         retval = acpiphp_enable_slot(slot);
1355                         if (retval) {
1356                                 err("Error occurred in enabling\n");
1357                                 goto err_exit;
1358                         }
1359                         enabled++;
1360                 }
1361         }
1362
1363         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1364
1365  err_exit:
1366         return retval;
1367 }
1368
1369 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1370 {
1371         u16 pci_cmd, pci_bctl;
1372         struct pci_dev *cdev;
1373
1374         /* Program hpp values for this device */
1375         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1376                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1377                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1378                 return;
1379
1380         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1381                 return;
1382
1383         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1384                         bridge->hpp.t0->cache_line_size);
1385         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1386                         bridge->hpp.t0->latency_timer);
1387         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1388         if (bridge->hpp.t0->enable_serr)
1389                 pci_cmd |= PCI_COMMAND_SERR;
1390         else
1391                 pci_cmd &= ~PCI_COMMAND_SERR;
1392         if (bridge->hpp.t0->enable_perr)
1393                 pci_cmd |= PCI_COMMAND_PARITY;
1394         else
1395                 pci_cmd &= ~PCI_COMMAND_PARITY;
1396         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1397
1398         /* Program bridge control value and child devices */
1399         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1400                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1401                                 bridge->hpp.t0->latency_timer);
1402                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1403                 if (bridge->hpp.t0->enable_serr)
1404                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1405                 else
1406                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1407                 if (bridge->hpp.t0->enable_perr)
1408                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1409                 else
1410                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1411                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1412                 if (dev->subordinate) {
1413                         list_for_each_entry(cdev, &dev->subordinate->devices,
1414                                         bus_list)
1415                                 program_hpp(cdev, bridge);
1416                 }
1417         }
1418 }
1419
1420 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1421 {
1422         struct acpiphp_bridge bridge;
1423         struct pci_dev *dev;
1424
1425         memset(&bridge, 0, sizeof(bridge));
1426         bridge.handle = handle;
1427         bridge.pci_bus = bus;
1428         bridge.pci_dev = bus->self;
1429         decode_hpp(&bridge);
1430         list_for_each_entry(dev, &bus->devices, bus_list)
1431                 program_hpp(dev, &bridge);
1432
1433 }
1434
1435 /*
1436  * Remove devices for which we could not assign resources, call
1437  * arch specific code to fix-up the bus
1438  */
1439 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1440 {
1441         struct pci_dev *dev;
1442         int i;
1443         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1444
1445         list_for_each_entry(dev, &bus->devices, bus_list) {
1446                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1447                         struct resource *res = &dev->resource[i];
1448                         if ((res->flags & type_mask) && !res->start &&
1449                                         res->end) {
1450                                 /* Could not assign a required resources
1451                                  * for this device, remove it */
1452                                 pci_remove_bus_device(dev);
1453                                 break;
1454                         }
1455                 }
1456         }
1457 }
1458
1459 /* Program resources in newly inserted bridge */
1460 static int acpiphp_configure_bridge (acpi_handle handle)
1461 {
1462         struct acpi_pci_id pci_id;
1463         struct pci_bus *bus;
1464
1465         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1466                 err("cannot get PCI domain and bus number for bridge\n");
1467                 return -EINVAL;
1468         }
1469         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1470         if (!bus) {
1471                 err("cannot find bus %d:%d\n",
1472                                 pci_id.segment, pci_id.bus);
1473                 return -EINVAL;
1474         }
1475
1476         pci_bus_size_bridges(bus);
1477         pci_bus_assign_resources(bus);
1478         acpiphp_sanitize_bus(bus);
1479         acpiphp_set_hpp_values(handle, bus);
1480         pci_enable_bridges(bus);
1481         acpiphp_configure_ioapics(handle);
1482         return 0;
1483 }
1484
1485 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1486 {
1487         struct acpi_device *device, *pdevice;
1488         acpi_handle phandle;
1489
1490         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1491                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1492                 err("unexpected notification type %d\n", type);
1493                 return;
1494         }
1495
1496         acpi_get_parent(handle, &phandle);
1497         if (acpi_bus_get_device(phandle, &pdevice)) {
1498                 dbg("no parent device, assuming NULL\n");
1499                 pdevice = NULL;
1500         }
1501         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1502                 err("cannot add bridge to acpi list\n");
1503                 return;
1504         }
1505         if (!acpiphp_configure_bridge(handle) &&
1506                 !acpi_bus_start(device))
1507                 add_bridge(handle);
1508         else
1509                 err("cannot configure and start bridge\n");
1510
1511 }
1512
1513 /*
1514  * ACPI event handlers
1515  */
1516
1517 static acpi_status
1518 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1519 {
1520         int *count = (int *)context;
1521         struct acpiphp_bridge *bridge;
1522
1523         bridge = acpiphp_handle_to_bridge(handle);
1524         if (bridge)
1525                 (*count)++;
1526         return AE_OK ;
1527 }
1528
1529 static acpi_status
1530 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1531 {
1532         struct acpiphp_bridge *bridge;
1533         char objname[64];
1534         struct acpi_buffer buffer = { .length = sizeof(objname),
1535                                       .pointer = objname };
1536
1537         bridge = acpiphp_handle_to_bridge(handle);
1538         if (bridge) {
1539                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1540                 dbg("%s: re-enumerating slots under %s\n",
1541                         __func__, objname);
1542                 acpiphp_check_bridge(bridge);
1543         }
1544         return AE_OK ;
1545 }
1546
1547 /**
1548  * handle_hotplug_event_bridge - handle ACPI event on bridges
1549  * @handle: Notify()'ed acpi_handle
1550  * @type: Notify code
1551  * @context: pointer to acpiphp_bridge structure
1552  *
1553  * Handles ACPI event notification on {host,p2p} bridges.
1554  */
1555 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1556 {
1557         struct acpiphp_bridge *bridge;
1558         char objname[64];
1559         struct acpi_buffer buffer = { .length = sizeof(objname),
1560                                       .pointer = objname };
1561         struct acpi_device *device;
1562         int num_sub_bridges = 0;
1563
1564         if (acpi_bus_get_device(handle, &device)) {
1565                 /* This bridge must have just been physically inserted */
1566                 handle_bridge_insertion(handle, type);
1567                 return;
1568         }
1569
1570         bridge = acpiphp_handle_to_bridge(handle);
1571         if (type == ACPI_NOTIFY_BUS_CHECK) {
1572                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1573                         count_sub_bridges, &num_sub_bridges, NULL);
1574         }
1575
1576         if (!bridge && !num_sub_bridges) {
1577                 err("cannot get bridge info\n");
1578                 return;
1579         }
1580
1581         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1582
1583         switch (type) {
1584         case ACPI_NOTIFY_BUS_CHECK:
1585                 /* bus re-enumerate */
1586                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1587                 if (bridge) {
1588                         dbg("%s: re-enumerating slots under %s\n",
1589                                 __func__, objname);
1590                         acpiphp_check_bridge(bridge);
1591                 }
1592                 if (num_sub_bridges)
1593                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1594                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1595                 break;
1596
1597         case ACPI_NOTIFY_DEVICE_CHECK:
1598                 /* device check */
1599                 dbg("%s: Device check notify on %s\n", __func__, objname);
1600                 acpiphp_check_bridge(bridge);
1601                 break;
1602
1603         case ACPI_NOTIFY_DEVICE_WAKE:
1604                 /* wake event */
1605                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1606                 break;
1607
1608         case ACPI_NOTIFY_EJECT_REQUEST:
1609                 /* request device eject */
1610                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1611                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1612                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1613                         struct acpiphp_slot *slot;
1614                         slot = bridge->func->slot;
1615                         if (!acpiphp_disable_slot(slot))
1616                                 acpiphp_eject_slot(slot);
1617                 }
1618                 break;
1619
1620         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1621                 printk(KERN_ERR "Device %s cannot be configured due"
1622                                 " to a frequency mismatch\n", objname);
1623                 break;
1624
1625         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1626                 printk(KERN_ERR "Device %s cannot be configured due"
1627                                 " to a bus mode mismatch\n", objname);
1628                 break;
1629
1630         case ACPI_NOTIFY_POWER_FAULT:
1631                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1632                                 objname);
1633                 break;
1634
1635         default:
1636                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1637                 break;
1638         }
1639 }
1640
1641 /**
1642  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1643  * @handle: Notify()'ed acpi_handle
1644  * @type: Notify code
1645  * @context: pointer to acpiphp_func structure
1646  *
1647  * Handles ACPI event notification on slots.
1648  */
1649 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1650 {
1651         struct acpiphp_func *func;
1652         char objname[64];
1653         struct acpi_buffer buffer = { .length = sizeof(objname),
1654                                       .pointer = objname };
1655
1656         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1657
1658         func = (struct acpiphp_func *)context;
1659
1660         switch (type) {
1661         case ACPI_NOTIFY_BUS_CHECK:
1662                 /* bus re-enumerate */
1663                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1664                 acpiphp_enable_slot(func->slot);
1665                 break;
1666
1667         case ACPI_NOTIFY_DEVICE_CHECK:
1668                 /* device check : re-enumerate from parent bus */
1669                 dbg("%s: Device check notify on %s\n", __func__, objname);
1670                 acpiphp_check_bridge(func->slot->bridge);
1671                 break;
1672
1673         case ACPI_NOTIFY_DEVICE_WAKE:
1674                 /* wake event */
1675                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1676                 break;
1677
1678         case ACPI_NOTIFY_EJECT_REQUEST:
1679                 /* request device eject */
1680                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1681                 if (!(acpiphp_disable_slot(func->slot)))
1682                         acpiphp_eject_slot(func->slot);
1683                 break;
1684
1685         default:
1686                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1687                 break;
1688         }
1689 }
1690
1691
1692 static acpi_status
1693 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1694 {
1695         int *count = (int *)context;
1696
1697         if (acpi_root_bridge(handle)) {
1698                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1699                                 handle_hotplug_event_bridge, NULL);
1700                         (*count)++;
1701         }
1702         return AE_OK ;
1703 }
1704
1705 static struct acpi_pci_driver acpi_pci_hp_driver = {
1706         .add =          add_bridge,
1707         .remove =       remove_bridge,
1708 };
1709
1710 /**
1711  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1712  */
1713 int __init acpiphp_glue_init(void)
1714 {
1715         int num = 0;
1716
1717         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1718                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1719
1720         if (num <= 0)
1721                 return -1;
1722         else
1723                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1724
1725         return 0;
1726 }
1727
1728
1729 /**
1730  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1731  *
1732  * This function frees all data allocated in acpiphp_glue_init().
1733  */
1734 void  acpiphp_glue_exit(void)
1735 {
1736         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1737 }
1738
1739
1740 /**
1741  * acpiphp_get_num_slots - count number of slots in a system
1742  */
1743 int __init acpiphp_get_num_slots(void)
1744 {
1745         struct acpiphp_bridge *bridge;
1746         int num_slots = 0;
1747
1748         list_for_each_entry (bridge, &bridge_list, list) {
1749                 dbg("Bus %04x:%02x has %d slot%s\n",
1750                                 pci_domain_nr(bridge->pci_bus),
1751                                 bridge->pci_bus->number, bridge->nr_slots,
1752                                 bridge->nr_slots == 1 ? "" : "s");
1753                 num_slots += bridge->nr_slots;
1754         }
1755
1756         dbg("Total %d slots\n", num_slots);
1757         return num_slots;
1758 }
1759
1760
1761 #if 0
1762 /**
1763  * acpiphp_for_each_slot - call function for each slot
1764  * @fn: callback function
1765  * @data: context to be passed to callback function
1766  */
1767 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1768 {
1769         struct list_head *node;
1770         struct acpiphp_bridge *bridge;
1771         struct acpiphp_slot *slot;
1772         int retval = 0;
1773
1774         list_for_each (node, &bridge_list) {
1775                 bridge = (struct acpiphp_bridge *)node;
1776                 for (slot = bridge->slots; slot; slot = slot->next) {
1777                         retval = fn(slot, data);
1778                         if (!retval)
1779                                 goto err_exit;
1780                 }
1781         }
1782
1783  err_exit:
1784         return retval;
1785 }
1786 #endif
1787
1788
1789 /**
1790  * acpiphp_enable_slot - power on slot
1791  * @slot: ACPI PHP slot
1792  */
1793 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1794 {
1795         int retval;
1796
1797         mutex_lock(&slot->crit_sect);
1798
1799         /* wake up all functions */
1800         retval = power_on_slot(slot);
1801         if (retval)
1802                 goto err_exit;
1803
1804         if (get_slot_status(slot) == ACPI_STA_ALL) {
1805                 /* configure all functions */
1806                 retval = enable_device(slot);
1807                 if (retval)
1808                         power_off_slot(slot);
1809         } else {
1810                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1811                 power_off_slot(slot);
1812         }
1813
1814  err_exit:
1815         mutex_unlock(&slot->crit_sect);
1816         return retval;
1817 }
1818
1819 /**
1820  * acpiphp_disable_slot - power off slot
1821  * @slot: ACPI PHP slot
1822  */
1823 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1824 {
1825         int retval = 0;
1826
1827         mutex_lock(&slot->crit_sect);
1828
1829         /* unconfigure all functions */
1830         retval = disable_device(slot);
1831         if (retval)
1832                 goto err_exit;
1833
1834         /* power off all functions */
1835         retval = power_off_slot(slot);
1836         if (retval)
1837                 goto err_exit;
1838
1839  err_exit:
1840         mutex_unlock(&slot->crit_sect);
1841         return retval;
1842 }
1843
1844
1845 /*
1846  * slot enabled:  1
1847  * slot disabled: 0
1848  */
1849 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1850 {
1851         return (slot->flags & SLOT_POWEREDON);
1852 }
1853
1854
1855 /*
1856  * latch   open:  1
1857  * latch closed:  0
1858  */
1859 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1860 {
1861         unsigned int sta;
1862
1863         sta = get_slot_status(slot);
1864
1865         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1866 }
1867
1868
1869 /*
1870  * adapter presence : 1
1871  *          absence : 0
1872  */
1873 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1874 {
1875         unsigned int sta;
1876
1877         sta = get_slot_status(slot);
1878
1879         return (sta == 0) ? 0 : 1;
1880 }
1881
1882
1883 /*
1884  * pci address (seg/bus/dev)
1885  */
1886 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1887 {
1888         u32 address;
1889         struct pci_bus *pci_bus = slot->bridge->pci_bus;
1890
1891         address = (pci_domain_nr(pci_bus) << 16) |
1892                   (pci_bus->number << 8) |
1893                   slot->device;
1894
1895         return address;
1896 }