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  */
  87 static int is_ejectable(acpi_handle handle)
  88 {
  89         acpi_status status;
  90         acpi_handle tmp;
  91
  92         status = acpi_get_handle(handle, "_ADR", &tmp);
  93         if (ACPI_FAILURE(status)) {
  94                 return 0;
  95         }
  96
  97         status = acpi_get_handle(handle, "_EJ0", &tmp);
  98         if (ACPI_FAILURE(status)) {
  99                 return 0;
 100         }
 101
 102         return 1;
 103 }
 104
 105
 106 /* callback routine to check the existence of ejectable slots */
 107 static acpi_status
 108 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 109 {
 110         int *count = (int *)context;
 111
 112         if (is_ejectable(handle)) {
 113                 (*count)++;
 114                 /* only one ejectable slot is enough */
 115                 return AE_CTRL_TERMINATE;
 116         } else {
 117                 return AE_OK;
 118         }
 119 }
 120
 121 /* callback routine to check for the existance of a pci dock device */
 122 static acpi_status
 123 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 124 {
 125         int *count = (int *)context;
 126
 127         if (is_dock_device(handle)) {
 128                 (*count)++;
 129                 return AE_CTRL_TERMINATE;
 130         } else {
 131                 return AE_OK;
 132         }
 133 }
 134
 135
 136
 137
 138 /*
 139  * the _DCK method can do funny things... and sometimes not
 140  * hah-hah funny.
 141  *
 142  * TBD - figure out a way to only call fixups for
 143  * systems that require them.
 144  */
 145 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
 146         void *v)
 147 {
 148         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
 149         struct pci_bus *bus = func->slot->bridge->pci_bus;
 150         u32 buses;
 151
 152         if (!bus->self)
 153                 return  NOTIFY_OK;
 154
 155         /* fixup bad _DCK function that rewrites
 156          * secondary bridge on slot
 157          */
 158         pci_read_config_dword(bus->self,
 159                         PCI_PRIMARY_BUS,
 160                         &buses);
 161
 162         if (((buses >> 8) & 0xff) != bus->secondary) {
 163                 buses = (buses & 0xff000000)
 164                         | ((unsigned int)(bus->primary)     <<  0)
 165                         | ((unsigned int)(bus->secondary)   <<  8)
 166                         | ((unsigned int)(bus->subordinate) << 16);
 167                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
 168         }
 169         return NOTIFY_OK;
 170 }
 171
 172
 173
 174
 175 /* callback routine to register each ACPI PCI slot object */
 176 static acpi_status
 177 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 178 {
 179         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 180         struct acpiphp_slot *slot;
 181         struct acpiphp_func *newfunc;
 182         acpi_handle tmp;
 183         acpi_status status = AE_OK;
 184         unsigned long adr, sun;
 185         int device, function, retval;
 186
 187         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 188
 189         if (ACPI_FAILURE(status))
 190                 return AE_OK;
 191
 192         status = acpi_get_handle(handle, "_EJ0", &tmp);
 193
 194         if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
 195                 return AE_OK;
 196
 197         device = (adr >> 16) & 0xffff;
 198         function = adr & 0xffff;
 199
 200         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 201         if (!newfunc)
 202                 return AE_NO_MEMORY;
 203
 204         INIT_LIST_HEAD(&newfunc->sibling);
 205         newfunc->handle = handle;
 206         newfunc->function = function;
 207         if (ACPI_SUCCESS(status))
 208                 newfunc->flags = FUNC_HAS_EJ0;
 209
 210         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 211                 newfunc->flags |= FUNC_HAS_STA;
 212
 213         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 214                 newfunc->flags |= FUNC_HAS_PS0;
 215
 216         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 217                 newfunc->flags |= FUNC_HAS_PS3;
 218
 219         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 220                 newfunc->flags |= FUNC_HAS_DCK;
 221
 222         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 223         if (ACPI_FAILURE(status)) {
 224                 /*
 225                  * use the count of the number of slots we've found
 226                  * for the number of the slot
 227                  */
 228                 sun = bridge->nr_slots+1;
 229         }
 230
 231         /* search for objects that share the same slot */
 232         for (slot = bridge->slots; slot; slot = slot->next)
 233                 if (slot->device == device) {
 234                         if (slot->sun != sun)
 235                                 warn("sibling found, but _SUN doesn't match!\n");
 236                         break;
 237                 }
 238
 239         if (!slot) {
 240                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 241                 if (!slot) {
 242                         kfree(newfunc);
 243                         return AE_NO_MEMORY;
 244                 }
 245
 246                 slot->bridge = bridge;
 247                 slot->device = device;
 248                 slot->sun = sun;
 249                 INIT_LIST_HEAD(&slot->funcs);
 250                 mutex_init(&slot->crit_sect);
 251
 252                 slot->next = bridge->slots;
 253                 bridge->slots = slot;
 254
 255                 bridge->nr_slots++;
 256
 257                 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 258                                 slot->sun, pci_domain_nr(bridge->pci_bus),
 259                                 bridge->pci_bus->number, slot->device);
 260                 retval = acpiphp_register_hotplug_slot(slot);
 261                 if (retval) {
 262                         warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
 263                         goto err_exit;
 264                 }
 265         }
 266
 267         newfunc->slot = slot;
 268         list_add_tail(&newfunc->sibling, &slot->funcs);
 269
 270         /* associate corresponding pci_dev */
 271         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 272                                          PCI_DEVFN(device, function));
 273         if (newfunc->pci_dev) {
 274                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 275         }
 276
 277         if (is_dock_device(handle)) {
 278                 /* we don't want to call this device's _EJ0
 279                  * because we want the dock notify handler
 280                  * to call it after it calls _DCK
 281                  */
 282                 newfunc->flags &= ~FUNC_HAS_EJ0;
 283                 if (register_hotplug_dock_device(handle,
 284                         handle_hotplug_event_func, newfunc))
 285                         dbg("failed to register dock device\n");
 286
 287                 /* we need to be notified when dock events happen
 288                  * outside of the hotplug operation, since we may
 289                  * need to do fixups before we can hotplug.
 290                  */
 291                 newfunc->nb.notifier_call = post_dock_fixups;
 292                 if (register_dock_notifier(&newfunc->nb))
 293                         dbg("failed to register a dock notifier");
 294         }
 295
 296         /* install notify handler */
 297         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 298                 status = acpi_install_notify_handler(handle,
 299                                              ACPI_SYSTEM_NOTIFY,
 300                                              handle_hotplug_event_func,
 301                                              newfunc);
 302
 303                 if (ACPI_FAILURE(status))
 304                         err("failed to register interrupt notify handler\n");
 305         } else
 306                 status = AE_OK;
 307
 308         return status;
 309
 310  err_exit:
 311         bridge->nr_slots--;
 312         bridge->slots = slot->next;
 313         kfree(slot);
 314         kfree(newfunc);
 315
 316         return AE_OK;
 317 }
 318
 319
 320 /* see if it's worth looking at this bridge */
 321 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 322 {
 323         acpi_status status;
 324         int count;
 325
 326         count = 0;
 327
 328         /* only check slots defined directly below bridge object */
 329         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 330                                      is_ejectable_slot, (void *)&count, NULL);
 331
 332         /*
 333          * we also need to add this bridge if there is a dock bridge or
 334          * other pci device on a dock station (removable)
 335          */
 336         if (!count)
 337                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
 338                                 (u32)1, is_pci_dock_device, (void *)&count,
 339                                 NULL);
 340
 341         return count;
 342 }
 343
 344
 345 /* decode ACPI 2.0 _HPP hot plug parameters */
 346 static void decode_hpp(struct acpiphp_bridge *bridge)
 347 {
 348         acpi_status status;
 349
 350         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 351         if (ACPI_FAILURE(status) ||
 352             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 353                 /* use default numbers */
 354                 printk(KERN_WARNING
 355                        "%s: Could not get hotplug parameters. Use defaults\n",
 356                        __FUNCTION__);
 357                 bridge->hpp.t0 = &bridge->hpp.type0_data;
 358                 bridge->hpp.t0->revision = 0;
 359                 bridge->hpp.t0->cache_line_size = 0x10;
 360                 bridge->hpp.t0->latency_timer = 0x40;
 361                 bridge->hpp.t0->enable_serr = 0;
 362                 bridge->hpp.t0->enable_perr = 0;
 363         }
 364 }
 365
 366
 367
 368 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 369 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 370 {
 371         acpi_status status;
 372
 373         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 374         decode_hpp(bridge);
 375
 376         /* must be added to the list prior to calling register_slot */
 377         list_add(&bridge->list, &bridge_list);
 378
 379         /* register all slot objects under this bridge */
 380         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 381                                      register_slot, bridge, NULL);
 382         if (ACPI_FAILURE(status)) {
 383                 list_del(&bridge->list);
 384                 return;
 385         }
 386
 387         /* install notify handler */
 388         if (bridge->type != BRIDGE_TYPE_HOST) {
 389                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 390                         status = acpi_remove_notify_handler(bridge->func->handle,
 391                                                 ACPI_SYSTEM_NOTIFY,
 392                                                 handle_hotplug_event_func);
 393                         if (ACPI_FAILURE(status))
 394                                 err("failed to remove notify handler\n");
 395                 }
 396                 status = acpi_install_notify_handler(bridge->handle,
 397                                              ACPI_SYSTEM_NOTIFY,
 398                                              handle_hotplug_event_bridge,
 399                                              bridge);
 400
 401                 if (ACPI_FAILURE(status)) {
 402                         err("failed to register interrupt notify handler\n");
 403                 }
 404         }
 405 }
 406
 407
 408 /* find acpiphp_func from acpiphp_bridge */
 409 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 410 {
 411         struct list_head *node, *l;
 412         struct acpiphp_bridge *bridge;
 413         struct acpiphp_slot *slot;
 414         struct acpiphp_func *func;
 415
 416         list_for_each(node, &bridge_list) {
 417                 bridge = list_entry(node, struct acpiphp_bridge, list);
 418                 for (slot = bridge->slots; slot; slot = slot->next) {
 419                         list_for_each(l, &slot->funcs) {
 420                                 func = list_entry(l, struct acpiphp_func,
 421                                                         sibling);
 422                                 if (func->handle == handle)
 423                                         return func;
 424                         }
 425                 }
 426         }
 427
 428         return NULL;
 429 }
 430
 431
 432 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 433 {
 434         acpi_handle dummy_handle;
 435
 436         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 437                                         "_STA", &dummy_handle)))
 438                 bridge->flags |= BRIDGE_HAS_STA;
 439
 440         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 441                                         "_EJ0", &dummy_handle)))
 442                 bridge->flags |= BRIDGE_HAS_EJ0;
 443
 444         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 445                                         "_PS0", &dummy_handle)))
 446                 bridge->flags |= BRIDGE_HAS_PS0;
 447
 448         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 449                                         "_PS3", &dummy_handle)))
 450                 bridge->flags |= BRIDGE_HAS_PS3;
 451
 452         /* is this ejectable p2p bridge? */
 453         if (bridge->flags & BRIDGE_HAS_EJ0) {
 454                 struct acpiphp_func *func;
 455
 456                 dbg("found ejectable p2p bridge\n");
 457
 458                 /* make link between PCI bridge and PCI function */
 459                 func = acpiphp_bridge_handle_to_function(bridge->handle);
 460                 if (!func)
 461                         return;
 462                 bridge->func = func;
 463                 func->bridge = bridge;
 464         }
 465 }
 466
 467
 468 /* allocate and initialize host bridge data structure */
 469 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 470 {
 471         struct acpiphp_bridge *bridge;
 472
 473         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 474         if (bridge == NULL)
 475                 return;
 476
 477         bridge->type = BRIDGE_TYPE_HOST;
 478         bridge->handle = handle;
 479
 480         bridge->pci_bus = pci_bus;
 481
 482         spin_lock_init(&bridge->res_lock);
 483
 484         init_bridge_misc(bridge);
 485 }
 486
 487
 488 /* allocate and initialize PCI-to-PCI bridge data structure */
 489 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 490 {
 491         struct acpiphp_bridge *bridge;
 492
 493         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 494         if (bridge == NULL) {
 495                 err("out of memory\n");
 496                 return;
 497         }
 498
 499         bridge->type = BRIDGE_TYPE_P2P;
 500         bridge->handle = handle;
 501         config_p2p_bridge_flags(bridge);
 502
 503         bridge->pci_dev = pci_dev_get(pci_dev);
 504         bridge->pci_bus = pci_dev->subordinate;
 505         if (!bridge->pci_bus) {
 506                 err("This is not a PCI-to-PCI bridge!\n");
 507                 goto err;
 508         }
 509
 510         spin_lock_init(&bridge->res_lock);
 511
 512         init_bridge_misc(bridge);
 513         return;
 514  err:
 515         pci_dev_put(pci_dev);
 516         kfree(bridge);
 517         return;
 518 }
 519
 520
 521 /* callback routine to find P2P bridges */
 522 static acpi_status
 523 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 524 {
 525         acpi_status status;
 526         acpi_handle dummy_handle;
 527         unsigned long tmp;
 528         int device, function;
 529         struct pci_dev *dev;
 530         struct pci_bus *pci_bus = context;
 531
 532         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 533         if (ACPI_FAILURE(status))
 534                 return AE_OK;           /* continue */
 535
 536         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 537         if (ACPI_FAILURE(status)) {
 538                 dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
 539                 return AE_OK;
 540         }
 541
 542         device = (tmp >> 16) & 0xffff;
 543         function = tmp & 0xffff;
 544
 545         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 546
 547         if (!dev || !dev->subordinate)
 548                 goto out;
 549
 550         /* check if this bridge has ejectable slots */
 551         if ((detect_ejectable_slots(handle) > 0)) {
 552                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 553                 add_p2p_bridge(handle, dev);
 554         }
 555
 556         /* search P2P bridges under this p2p bridge */
 557         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 558                                      find_p2p_bridge, dev->subordinate, NULL);
 559         if (ACPI_FAILURE(status))
 560                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 561
 562  out:
 563         pci_dev_put(dev);
 564         return AE_OK;
 565 }
 566
 567
 568 /* find hot-pluggable slots, and then find P2P bridge */
 569 static int add_bridge(acpi_handle handle)
 570 {
 571         acpi_status status;
 572         unsigned long tmp;
 573         int seg, bus;
 574         acpi_handle dummy_handle;
 575         struct pci_bus *pci_bus;
 576
 577         /* if the bridge doesn't have _STA, we assume it is always there */
 578         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 579         if (ACPI_SUCCESS(status)) {
 580                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 581                 if (ACPI_FAILURE(status)) {
 582                         dbg("%s: _STA evaluation failure\n", __FUNCTION__);
 583                         return 0;
 584                 }
 585                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 586                         /* don't register this object */
 587                         return 0;
 588         }
 589
 590         /* get PCI segment number */
 591         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 592
 593         seg = ACPI_SUCCESS(status) ? tmp : 0;
 594
 595         /* get PCI bus number */
 596         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 597
 598         if (ACPI_SUCCESS(status)) {
 599                 bus = tmp;
 600         } else {
 601                 warn("can't get bus number, assuming 0\n");
 602                 bus = 0;
 603         }
 604
 605         pci_bus = pci_find_bus(seg, bus);
 606         if (!pci_bus) {
 607                 err("Can't find bus %04x:%02x\n", seg, bus);
 608                 return 0;
 609         }
 610
 611         /* check if this bridge has ejectable slots */
 612         if (detect_ejectable_slots(handle) > 0) {
 613                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 614                 add_host_bridge(handle, pci_bus);
 615         }
 616
 617         /* search P2P bridges under this host bridge */
 618         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 619                                      find_p2p_bridge, pci_bus, NULL);
 620
 621         if (ACPI_FAILURE(status))
 622                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 623
 624         return 0;
 625 }
 626
 627 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 628 {
 629         struct list_head *head;
 630         list_for_each(head, &bridge_list) {
 631                 struct acpiphp_bridge *bridge = list_entry(head,
 632                                                 struct acpiphp_bridge, list);
 633                 if (bridge->handle == handle)
 634                         return bridge;
 635         }
 636
 637         return NULL;
 638 }
 639
 640 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 641 {
 642         struct list_head *list, *tmp;
 643         struct acpiphp_slot *slot;
 644         acpi_status status;
 645         acpi_handle handle = bridge->handle;
 646
 647         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 648                                             handle_hotplug_event_bridge);
 649         if (ACPI_FAILURE(status))
 650                 err("failed to remove notify handler\n");
 651
 652         if ((bridge->type != BRIDGE_TYPE_HOST) &&
 653             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
 654                 status = acpi_install_notify_handler(bridge->func->handle,
 655                                                 ACPI_SYSTEM_NOTIFY,
 656                                                 handle_hotplug_event_func,
 657                                                 bridge->func);
 658                 if (ACPI_FAILURE(status))
 659                         err("failed to install interrupt notify handler\n");
 660         }
 661
 662         slot = bridge->slots;
 663         while (slot) {
 664                 struct acpiphp_slot *next = slot->next;
 665                 list_for_each_safe (list, tmp, &slot->funcs) {
 666                         struct acpiphp_func *func;
 667                         func = list_entry(list, struct acpiphp_func, sibling);
 668                         if (is_dock_device(func->handle)) {
 669                                 unregister_hotplug_dock_device(func->handle);
 670                                 unregister_dock_notifier(&func->nb);
 671                         }
 672                         if (!(func->flags & FUNC_HAS_DCK)) {
 673                                 status = acpi_remove_notify_handler(func->handle,
 674                                                 ACPI_SYSTEM_NOTIFY,
 675                                                 handle_hotplug_event_func);
 676                                 if (ACPI_FAILURE(status))
 677                                         err("failed to remove notify handler\n");
 678                         }
 679                         pci_dev_put(func->pci_dev);
 680                         list_del(list);
 681                         kfree(func);
 682                 }
 683                 acpiphp_unregister_hotplug_slot(slot);
 684                 list_del(&slot->funcs);
 685                 kfree(slot);
 686                 slot = next;
 687         }
 688
 689         pci_dev_put(bridge->pci_dev);
 690         list_del(&bridge->list);
 691         kfree(bridge);
 692 }
 693
 694 static acpi_status
 695 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 696 {
 697         struct acpiphp_bridge *bridge;
 698
 699         /* cleanup p2p bridges under this P2P bridge
 700            in a depth-first manner */
 701         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 702                                 cleanup_p2p_bridge, NULL, NULL);
 703
 704         if (!(bridge = acpiphp_handle_to_bridge(handle)))
 705                 return AE_OK;
 706         cleanup_bridge(bridge);
 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         bridge = acpiphp_handle_to_bridge(handle);
 720         if (bridge)
 721                 cleanup_bridge(bridge);
 722 }
 723
 724 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 725 {
 726         struct acpi_pci_id id;
 727         struct pci_bus *bus;
 728         struct pci_dev *dev;
 729
 730         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 731                 return NULL;
 732
 733         bus = pci_find_bus(id.segment, id.bus);
 734         if (!bus)
 735                 return NULL;
 736
 737         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 738         if (!dev)
 739                 return NULL;
 740
 741         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 742             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 743         {
 744                 pci_dev_put(dev);
 745                 return NULL;
 746         }
 747
 748         return dev;
 749 }
 750
 751 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 752 {
 753         acpi_status status;
 754         int result = -1;
 755         unsigned long gsb;
 756         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 757         union acpi_object *obj;
 758         void *table;
 759
 760         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 761         if (ACPI_SUCCESS(status)) {
 762                 *gsi_base = (u32)gsb;
 763                 return 0;
 764         }
 765
 766         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 767         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 768                 return -1;
 769
 770         obj = buffer.pointer;
 771         if (obj->type != ACPI_TYPE_BUFFER)
 772                 goto out;
 773
 774         table = obj->buffer.pointer;
 775         switch (((struct acpi_subtable_header *)table)->type) {
 776         case ACPI_MADT_TYPE_IO_SAPIC:
 777                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
 778                 result = 0;
 779                 break;
 780         case ACPI_MADT_TYPE_IO_APIC:
 781                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
 782                 result = 0;
 783                 break;
 784         default:
 785                 break;
 786         }
 787  out:
 788         kfree(buffer.pointer);
 789         return result;
 790 }
 791
 792 static acpi_status
 793 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 794 {
 795         acpi_status status;
 796         unsigned long sta;
 797         acpi_handle tmp;
 798         struct pci_dev *pdev;
 799         u32 gsi_base;
 800         u64 phys_addr;
 801         struct acpiphp_ioapic *ioapic;
 802
 803         /* Evaluate _STA if present */
 804         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 805         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 806                 return AE_CTRL_DEPTH;
 807
 808         /* Scan only PCI bus scope */
 809         status = acpi_get_handle(handle, "_HID", &tmp);
 810         if (ACPI_SUCCESS(status))
 811                 return AE_CTRL_DEPTH;
 812
 813         if (get_gsi_base(handle, &gsi_base))
 814                 return AE_OK;
 815
 816         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 817         if (!ioapic)
 818                 return AE_NO_MEMORY;
 819
 820         pdev = get_apic_pci_info(handle);
 821         if (!pdev)
 822                 goto exit_kfree;
 823
 824         if (pci_enable_device(pdev))
 825                 goto exit_pci_dev_put;
 826
 827         pci_set_master(pdev);
 828
 829         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 830                 goto exit_pci_disable_device;
 831
 832         phys_addr = pci_resource_start(pdev, 0);
 833         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 834                 goto exit_pci_release_region;
 835
 836         ioapic->gsi_base = gsi_base;
 837         ioapic->dev = pdev;
 838         spin_lock(&ioapic_list_lock);
 839         list_add_tail(&ioapic->list, &ioapic_list);
 840         spin_unlock(&ioapic_list_lock);
 841
 842         return AE_OK;
 843
 844  exit_pci_release_region:
 845         pci_release_region(pdev, 0);
 846  exit_pci_disable_device:
 847         pci_disable_device(pdev);
 848  exit_pci_dev_put:
 849         pci_dev_put(pdev);
 850  exit_kfree:
 851         kfree(ioapic);
 852
 853         return AE_OK;
 854 }
 855
 856 static acpi_status
 857 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 858 {
 859         acpi_status status;
 860         unsigned long sta;
 861         acpi_handle tmp;
 862         u32 gsi_base;
 863         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 864
 865         /* Evaluate _STA if present */
 866         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 867         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 868                 return AE_CTRL_DEPTH;
 869
 870         /* Scan only PCI bus scope */
 871         status = acpi_get_handle(handle, "_HID", &tmp);
 872         if (ACPI_SUCCESS(status))
 873                 return AE_CTRL_DEPTH;
 874
 875         if (get_gsi_base(handle, &gsi_base))
 876                 return AE_OK;
 877
 878         acpi_unregister_ioapic(handle, gsi_base);
 879
 880         spin_lock(&ioapic_list_lock);
 881         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 882                 if (pos->gsi_base != gsi_base)
 883                         continue;
 884                 ioapic = pos;
 885                 list_del(&ioapic->list);
 886                 break;
 887         }
 888         spin_unlock(&ioapic_list_lock);
 889
 890         if (!ioapic)
 891                 return AE_OK;
 892
 893         pci_release_region(ioapic->dev, 0);
 894         pci_disable_device(ioapic->dev);
 895         pci_dev_put(ioapic->dev);
 896         kfree(ioapic);
 897
 898         return AE_OK;
 899 }
 900
 901 static int acpiphp_configure_ioapics(acpi_handle handle)
 902 {
 903         ioapic_add(handle, 0, NULL, NULL);
 904         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 905                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 906         return 0;
 907 }
 908
 909 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 910 {
 911         ioapic_remove(handle, 0, NULL, NULL);
 912         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 913                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 914         return 0;
 915 }
 916
 917 static int power_on_slot(struct acpiphp_slot *slot)
 918 {
 919         acpi_status status;
 920         struct acpiphp_func *func;
 921         struct list_head *l;
 922         int retval = 0;
 923
 924         /* if already enabled, just skip */
 925         if (slot->flags & SLOT_POWEREDON)
 926                 goto err_exit;
 927
 928         list_for_each (l, &slot->funcs) {
 929                 func = list_entry(l, struct acpiphp_func, sibling);
 930
 931                 if (func->flags & FUNC_HAS_PS0) {
 932                         dbg("%s: executing _PS0\n", __FUNCTION__);
 933                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 934                         if (ACPI_FAILURE(status)) {
 935                                 warn("%s: _PS0 failed\n", __FUNCTION__);
 936                                 retval = -1;
 937                                 goto err_exit;
 938                         } else
 939                                 break;
 940                 }
 941         }
 942
 943         /* TBD: evaluate _STA to check if the slot is enabled */
 944
 945         slot->flags |= SLOT_POWEREDON;
 946
 947  err_exit:
 948         return retval;
 949 }
 950
 951
 952 static int power_off_slot(struct acpiphp_slot *slot)
 953 {
 954         acpi_status status;
 955         struct acpiphp_func *func;
 956         struct list_head *l;
 957
 958         int retval = 0;
 959
 960         /* if already disabled, just skip */
 961         if ((slot->flags & SLOT_POWEREDON) == 0)
 962                 goto err_exit;
 963
 964         list_for_each (l, &slot->funcs) {
 965                 func = list_entry(l, struct acpiphp_func, sibling);
 966
 967                 if (func->flags & FUNC_HAS_PS3) {
 968                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 969                         if (ACPI_FAILURE(status)) {
 970                                 warn("%s: _PS3 failed\n", __FUNCTION__);
 971                                 retval = -1;
 972                                 goto err_exit;
 973                         } else
 974                                 break;
 975                 }
 976         }
 977
 978         /* TBD: evaluate _STA to check if the slot is disabled */
 979
 980         slot->flags &= (~SLOT_POWEREDON);
 981
 982  err_exit:
 983         return retval;
 984 }
 985
 986
 987
 988 /**
 989  * acpiphp_max_busnr - return the highest reserved bus number under
 990  * the given bus.
 991  * @bus: bus to start search with
 992  *
 993  */
 994 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
 995 {
 996         struct list_head *tmp;
 997         unsigned char max, n;
 998
 999         /*
1000          * pci_bus_max_busnr will return the highest
1001          * reserved busnr for all these children.
1002          * that is equivalent to the bus->subordinate
1003          * value.  We don't want to use the parent's
1004          * bus->subordinate value because it could have
1005          * padding in it.
1006          */
1007         max = bus->secondary;
1008
1009         list_for_each(tmp, &bus->children) {
1010                 n = pci_bus_max_busnr(pci_bus_b(tmp));
1011                 if (n > max)
1012                         max = n;
1013         }
1014         return max;
1015 }
1016
1017
1018 /**
1019  * acpiphp_bus_add - add a new bus to acpi subsystem
1020  * @func: acpiphp_func of the bridge
1021  *
1022  */
1023 static int acpiphp_bus_add(struct acpiphp_func *func)
1024 {
1025         acpi_handle phandle;
1026         struct acpi_device *device, *pdevice;
1027         int ret_val;
1028
1029         acpi_get_parent(func->handle, &phandle);
1030         if (acpi_bus_get_device(phandle, &pdevice)) {
1031                 dbg("no parent device, assuming NULL\n");
1032                 pdevice = NULL;
1033         }
1034         if (!acpi_bus_get_device(func->handle, &device)) {
1035                 dbg("bus exists... trim\n");
1036                 /* this shouldn't be in here, so remove
1037                  * the bus then re-add it...
1038                  */
1039                 ret_val = acpi_bus_trim(device, 1);
1040                 dbg("acpi_bus_trim return %x\n", ret_val);
1041         }
1042
1043         ret_val = acpi_bus_add(&device, pdevice, func->handle,
1044                 ACPI_BUS_TYPE_DEVICE);
1045         if (ret_val) {
1046                 dbg("error adding bus, %x\n",
1047                         -ret_val);
1048                 goto acpiphp_bus_add_out;
1049         }
1050         /*
1051          * try to start anyway.  We could have failed to add
1052          * simply because this bus had previously been added
1053          * on another add.  Don't bother with the return value
1054          * we just keep going.
1055          */
1056         ret_val = acpi_bus_start(device);
1057
1058 acpiphp_bus_add_out:
1059         return ret_val;
1060 }
1061
1062
1063 /**
1064  * acpiphp_bus_trim - trim a bus from acpi subsystem
1065  * @handle: handle to acpi namespace
1066  *
1067  */
1068 static int acpiphp_bus_trim(acpi_handle handle)
1069 {
1070         struct acpi_device *device;
1071         int retval;
1072
1073         retval = acpi_bus_get_device(handle, &device);
1074         if (retval) {
1075                 dbg("acpi_device not found\n");
1076                 return retval;
1077         }
1078
1079         retval = acpi_bus_trim(device, 1);
1080         if (retval)
1081                 err("cannot remove from acpi list\n");
1082
1083         return retval;
1084 }
1085
1086 /**
1087  * enable_device - enable, configure a slot
1088  * @slot: slot to be enabled
1089  *
1090  * This function should be called per *physical slot*,
1091  * not per each slot object in ACPI namespace.
1092  *
1093  */
1094 static int enable_device(struct acpiphp_slot *slot)
1095 {
1096         struct pci_dev *dev;
1097         struct pci_bus *bus = slot->bridge->pci_bus;
1098         struct list_head *l;
1099         struct acpiphp_func *func;
1100         int retval = 0;
1101         int num, max, pass;
1102         acpi_status status;
1103
1104         if (slot->flags & SLOT_ENABLED)
1105                 goto err_exit;
1106
1107         /* sanity check: dev should be NULL when hot-plugged in */
1108         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1109         if (dev) {
1110                 /* This case shouldn't happen */
1111                 err("pci_dev structure already exists.\n");
1112                 pci_dev_put(dev);
1113                 retval = -1;
1114                 goto err_exit;
1115         }
1116
1117         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1118         if (num == 0) {
1119                 err("No new device found\n");
1120                 retval = -1;
1121                 goto err_exit;
1122         }
1123
1124         max = acpiphp_max_busnr(bus);
1125         for (pass = 0; pass < 2; pass++) {
1126                 list_for_each_entry(dev, &bus->devices, bus_list) {
1127                         if (PCI_SLOT(dev->devfn) != slot->device)
1128                                 continue;
1129                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1130                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1131                                 max = pci_scan_bridge(bus, dev, max, pass);
1132                                 if (pass && dev->subordinate)
1133                                         pci_bus_size_bridges(dev->subordinate);
1134                         }
1135                 }
1136         }
1137
1138         list_for_each (l, &slot->funcs) {
1139                 func = list_entry(l, struct acpiphp_func, sibling);
1140                 acpiphp_bus_add(func);
1141         }
1142
1143         pci_bus_assign_resources(bus);
1144         acpiphp_sanitize_bus(bus);
1145         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1146         list_for_each_entry(func, &slot->funcs, sibling)
1147                 acpiphp_configure_ioapics(func->handle);
1148         pci_enable_bridges(bus);
1149         pci_bus_add_devices(bus);
1150
1151         /* associate pci_dev to our representation */
1152         list_for_each (l, &slot->funcs) {
1153                 func = list_entry(l, struct acpiphp_func, sibling);
1154                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1155                                                         func->function));
1156                 if (!func->pci_dev)
1157                         continue;
1158
1159                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1160                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1161                         continue;
1162
1163                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1164                 if (ACPI_FAILURE(status))
1165                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1166                                 status);
1167         }
1168
1169         slot->flags |= SLOT_ENABLED;
1170
1171  err_exit:
1172         return retval;
1173 }
1174
1175 static void disable_bridges(struct pci_bus *bus)
1176 {
1177         struct pci_dev *dev;
1178         list_for_each_entry(dev, &bus->devices, bus_list) {
1179                 if (dev->subordinate) {
1180                         disable_bridges(dev->subordinate);
1181                         pci_disable_device(dev);
1182                 }
1183         }
1184 }
1185
1186 /**
1187  * disable_device - disable a slot
1188  */
1189 static int disable_device(struct acpiphp_slot *slot)
1190 {
1191         int retval = 0;
1192         struct acpiphp_func *func;
1193         struct list_head *l;
1194
1195         /* is this slot already disabled? */
1196         if (!(slot->flags & SLOT_ENABLED))
1197                 goto err_exit;
1198
1199         list_for_each (l, &slot->funcs) {
1200                 func = list_entry(l, struct acpiphp_func, sibling);
1201
1202                 if (func->bridge) {
1203                         /* cleanup p2p bridges under this P2P bridge */
1204                         cleanup_p2p_bridge(func->bridge->handle,
1205                                                 (u32)1, NULL, NULL);
1206                         func->bridge = NULL;
1207                 }
1208
1209                 if (func->pci_dev) {
1210                         pci_stop_bus_device(func->pci_dev);
1211                         if (func->pci_dev->subordinate) {
1212                                 disable_bridges(func->pci_dev->subordinate);
1213                                 pci_disable_device(func->pci_dev);
1214                         }
1215                 }
1216         }
1217
1218         list_for_each (l, &slot->funcs) {
1219                 func = list_entry(l, struct acpiphp_func, sibling);
1220
1221                 acpiphp_unconfigure_ioapics(func->handle);
1222                 acpiphp_bus_trim(func->handle);
1223                 /* try to remove anyway.
1224                  * acpiphp_bus_add might have been failed */
1225
1226                 if (!func->pci_dev)
1227                         continue;
1228
1229                 pci_remove_bus_device(func->pci_dev);
1230                 pci_dev_put(func->pci_dev);
1231                 func->pci_dev = NULL;
1232         }
1233
1234         slot->flags &= (~SLOT_ENABLED);
1235
1236  err_exit:
1237         return retval;
1238 }
1239
1240
1241 /**
1242  * get_slot_status - get ACPI slot status
1243  *
1244  * if a slot has _STA for each function and if any one of them
1245  * returned non-zero status, return it
1246  *
1247  * if a slot doesn't have _STA and if any one of its functions'
1248  * configuration space is configured, return 0x0f as a _STA
1249  *
1250  * otherwise return 0
1251  */
1252 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1253 {
1254         acpi_status status;
1255         unsigned long sta = 0;
1256         u32 dvid;
1257         struct list_head *l;
1258         struct acpiphp_func *func;
1259
1260         list_for_each (l, &slot->funcs) {
1261                 func = list_entry(l, struct acpiphp_func, sibling);
1262
1263                 if (func->flags & FUNC_HAS_STA) {
1264                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1265                         if (ACPI_SUCCESS(status) && sta)
1266                                 break;
1267                 } else {
1268                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1269                                                   PCI_DEVFN(slot->device,
1270                                                             func->function),
1271                                                   PCI_VENDOR_ID, &dvid);
1272                         if (dvid != 0xffffffff) {
1273                                 sta = ACPI_STA_ALL;
1274                                 break;
1275                         }
1276                 }
1277         }
1278
1279         return (unsigned int)sta;
1280 }
1281
1282 /**
1283  * acpiphp_eject_slot - physically eject the slot
1284  */
1285 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1286 {
1287         acpi_status status;
1288         struct acpiphp_func *func;
1289         struct list_head *l;
1290         struct acpi_object_list arg_list;
1291         union acpi_object arg;
1292
1293         list_for_each (l, &slot->funcs) {
1294                 func = list_entry(l, struct acpiphp_func, sibling);
1295
1296                 /* We don't want to call _EJ0 on non-existing functions. */
1297                 if ((func->flags & FUNC_HAS_EJ0)) {
1298                         /* _EJ0 method take one argument */
1299                         arg_list.count = 1;
1300                         arg_list.pointer = &arg;
1301                         arg.type = ACPI_TYPE_INTEGER;
1302                         arg.integer.value = 1;
1303
1304                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1305                         if (ACPI_FAILURE(status)) {
1306                                 warn("%s: _EJ0 failed\n", __FUNCTION__);
1307                                 return -1;
1308                         } else
1309                                 break;
1310                 }
1311         }
1312         return 0;
1313 }
1314
1315 /**
1316  * acpiphp_check_bridge - re-enumerate devices
1317  *
1318  * Iterate over all slots under this bridge and make sure that if a
1319  * card is present they are enabled, and if not they are disabled.
1320  */
1321 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1322 {
1323         struct acpiphp_slot *slot;
1324         int retval = 0;
1325         int enabled, disabled;
1326
1327         enabled = disabled = 0;
1328
1329         for (slot = bridge->slots; slot; slot = slot->next) {
1330                 unsigned int status = get_slot_status(slot);
1331                 if (slot->flags & SLOT_ENABLED) {
1332                         if (status == ACPI_STA_ALL)
1333                                 continue;
1334                         retval = acpiphp_disable_slot(slot);
1335                         if (retval) {
1336                                 err("Error occurred in disabling\n");
1337                                 goto err_exit;
1338                         } else {
1339                                 acpiphp_eject_slot(slot);
1340                         }
1341                         disabled++;
1342                 } else {
1343                         if (status != ACPI_STA_ALL)
1344                                 continue;
1345                         retval = acpiphp_enable_slot(slot);
1346                         if (retval) {
1347                                 err("Error occurred in enabling\n");
1348                                 goto err_exit;
1349                         }
1350                         enabled++;
1351                 }
1352         }
1353
1354         dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
1355
1356  err_exit:
1357         return retval;
1358 }
1359
1360 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1361 {
1362         u16 pci_cmd, pci_bctl;
1363         struct pci_dev *cdev;
1364
1365         /* Program hpp values for this device */
1366         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1367                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1368                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1369                 return;
1370
1371         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1372                 return;
1373
1374         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1375                         bridge->hpp.t0->cache_line_size);
1376         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1377                         bridge->hpp.t0->latency_timer);
1378         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1379         if (bridge->hpp.t0->enable_serr)
1380                 pci_cmd |= PCI_COMMAND_SERR;
1381         else
1382                 pci_cmd &= ~PCI_COMMAND_SERR;
1383         if (bridge->hpp.t0->enable_perr)
1384                 pci_cmd |= PCI_COMMAND_PARITY;
1385         else
1386                 pci_cmd &= ~PCI_COMMAND_PARITY;
1387         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1388
1389         /* Program bridge control value and child devices */
1390         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1391                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1392                                 bridge->hpp.t0->latency_timer);
1393                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1394                 if (bridge->hpp.t0->enable_serr)
1395                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1396                 else
1397                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1398                 if (bridge->hpp.t0->enable_perr)
1399                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1400                 else
1401                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1402                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1403                 if (dev->subordinate) {
1404                         list_for_each_entry(cdev, &dev->subordinate->devices,
1405                                         bus_list)
1406                                 program_hpp(cdev, bridge);
1407                 }
1408         }
1409 }
1410
1411 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1412 {
1413         struct acpiphp_bridge bridge;
1414         struct pci_dev *dev;
1415
1416         memset(&bridge, 0, sizeof(bridge));
1417         bridge.handle = handle;
1418         bridge.pci_bus = bus;
1419         bridge.pci_dev = bus->self;
1420         decode_hpp(&bridge);
1421         list_for_each_entry(dev, &bus->devices, bus_list)
1422                 program_hpp(dev, &bridge);
1423
1424 }
1425
1426 /*
1427  * Remove devices for which we could not assign resources, call
1428  * arch specific code to fix-up the bus
1429  */
1430 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1431 {
1432         struct pci_dev *dev;
1433         int i;
1434         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1435
1436         list_for_each_entry(dev, &bus->devices, bus_list) {
1437                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1438                         struct resource *res = &dev->resource[i];
1439                         if ((res->flags & type_mask) && !res->start &&
1440                                         res->end) {
1441                                 /* Could not assign a required resources
1442                                  * for this device, remove it */
1443                                 pci_remove_bus_device(dev);
1444                                 break;
1445                         }
1446                 }
1447         }
1448 }
1449
1450 /* Program resources in newly inserted bridge */
1451 static int acpiphp_configure_bridge (acpi_handle handle)
1452 {
1453         struct acpi_pci_id pci_id;
1454         struct pci_bus *bus;
1455
1456         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1457                 err("cannot get PCI domain and bus number for bridge\n");
1458                 return -EINVAL;
1459         }
1460         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1461         if (!bus) {
1462                 err("cannot find bus %d:%d\n",
1463                                 pci_id.segment, pci_id.bus);
1464                 return -EINVAL;
1465         }
1466
1467         pci_bus_size_bridges(bus);
1468         pci_bus_assign_resources(bus);
1469         acpiphp_sanitize_bus(bus);
1470         acpiphp_set_hpp_values(handle, bus);
1471         pci_enable_bridges(bus);
1472         acpiphp_configure_ioapics(handle);
1473         return 0;
1474 }
1475
1476 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1477 {
1478         struct acpi_device *device, *pdevice;
1479         acpi_handle phandle;
1480
1481         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1482                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1483                 err("unexpected notification type %d\n", type);
1484                 return;
1485         }
1486
1487         acpi_get_parent(handle, &phandle);
1488         if (acpi_bus_get_device(phandle, &pdevice)) {
1489                 dbg("no parent device, assuming NULL\n");
1490                 pdevice = NULL;
1491         }
1492         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1493                 err("cannot add bridge to acpi list\n");
1494                 return;
1495         }
1496         if (!acpiphp_configure_bridge(handle) &&
1497                 !acpi_bus_start(device))
1498                 add_bridge(handle);
1499         else
1500                 err("cannot configure and start bridge\n");
1501
1502 }
1503
1504 /*
1505  * ACPI event handlers
1506  */
1507
1508 static acpi_status
1509 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1510 {
1511         int *count = (int *)context;
1512         struct acpiphp_bridge *bridge;
1513
1514         bridge = acpiphp_handle_to_bridge(handle);
1515         if (bridge)
1516                 (*count)++;
1517         return AE_OK ;
1518 }
1519
1520 static acpi_status
1521 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1522 {
1523         struct acpiphp_bridge *bridge;
1524         char objname[64];
1525         struct acpi_buffer buffer = { .length = sizeof(objname),
1526                                       .pointer = objname };
1527
1528         bridge = acpiphp_handle_to_bridge(handle);
1529         if (bridge) {
1530                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1531                 dbg("%s: re-enumerating slots under %s\n",
1532                         __FUNCTION__, objname);
1533                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1534                 acpiphp_check_bridge(bridge);
1535         }
1536         return AE_OK ;
1537 }
1538
1539 /**
1540  * handle_hotplug_event_bridge - handle ACPI event on bridges
1541  *
1542  * @handle: Notify()'ed acpi_handle
1543  * @type: Notify code
1544  * @context: pointer to acpiphp_bridge structure
1545  *
1546  * handles ACPI event notification on {host,p2p} bridges
1547  *
1548  */
1549 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1550 {
1551         struct acpiphp_bridge *bridge;
1552         char objname[64];
1553         struct acpi_buffer buffer = { .length = sizeof(objname),
1554                                       .pointer = objname };
1555         struct acpi_device *device;
1556         int num_sub_bridges = 0;
1557
1558         if (acpi_bus_get_device(handle, &device)) {
1559                 /* This bridge must have just been physically inserted */
1560                 handle_bridge_insertion(handle, type);
1561                 return;
1562         }
1563
1564         bridge = acpiphp_handle_to_bridge(handle);
1565         if (type == ACPI_NOTIFY_BUS_CHECK) {
1566                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1567                         count_sub_bridges, &num_sub_bridges, NULL);
1568         }
1569
1570         if (!bridge && !num_sub_bridges) {
1571                 err("cannot get bridge info\n");
1572                 return;
1573         }
1574
1575         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1576
1577         switch (type) {
1578         case ACPI_NOTIFY_BUS_CHECK:
1579                 /* bus re-enumerate */
1580                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1581                 if (bridge) {
1582                         dbg("%s: re-enumerating slots under %s\n",
1583                                 __FUNCTION__, objname);
1584                         acpiphp_check_bridge(bridge);
1585                 }
1586                 if (num_sub_bridges)
1587                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1588                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1589                 break;
1590
1591         case ACPI_NOTIFY_DEVICE_CHECK:
1592                 /* device check */
1593                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1594                 acpiphp_check_bridge(bridge);
1595                 break;
1596
1597         case ACPI_NOTIFY_DEVICE_WAKE:
1598                 /* wake event */
1599                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1600                 break;
1601
1602         case ACPI_NOTIFY_EJECT_REQUEST:
1603                 /* request device eject */
1604                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1605                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1606                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1607                         struct acpiphp_slot *slot;
1608                         slot = bridge->func->slot;
1609                         if (!acpiphp_disable_slot(slot))
1610                                 acpiphp_eject_slot(slot);
1611                 }
1612                 break;
1613
1614         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1615                 printk(KERN_ERR "Device %s cannot be configured due"
1616                                 " to a frequency mismatch\n", objname);
1617                 break;
1618
1619         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1620                 printk(KERN_ERR "Device %s cannot be configured due"
1621                                 " to a bus mode mismatch\n", objname);
1622                 break;
1623
1624         case ACPI_NOTIFY_POWER_FAULT:
1625                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1626                                 objname);
1627                 break;
1628
1629         default:
1630                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1631                 break;
1632         }
1633 }
1634
1635 /**
1636  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1637  *
1638  * @handle: Notify()'ed acpi_handle
1639  * @type: Notify code
1640  * @context: pointer to acpiphp_func structure
1641  *
1642  * handles ACPI event notification on slots
1643  *
1644  */
1645 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1646 {
1647         struct acpiphp_func *func;
1648         char objname[64];
1649         struct acpi_buffer buffer = { .length = sizeof(objname),
1650                                       .pointer = objname };
1651
1652         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1653
1654         func = (struct acpiphp_func *)context;
1655
1656         switch (type) {
1657         case ACPI_NOTIFY_BUS_CHECK:
1658                 /* bus re-enumerate */
1659                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1660                 acpiphp_enable_slot(func->slot);
1661                 break;
1662
1663         case ACPI_NOTIFY_DEVICE_CHECK:
1664                 /* device check : re-enumerate from parent bus */
1665                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1666                 acpiphp_check_bridge(func->slot->bridge);
1667                 break;
1668
1669         case ACPI_NOTIFY_DEVICE_WAKE:
1670                 /* wake event */
1671                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1672                 break;
1673
1674         case ACPI_NOTIFY_EJECT_REQUEST:
1675                 /* request device eject */
1676                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1677                 if (!(acpiphp_disable_slot(func->slot)))
1678                         acpiphp_eject_slot(func->slot);
1679                 break;
1680
1681         default:
1682                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1683                 break;
1684         }
1685 }
1686
1687
1688 static acpi_status
1689 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1690 {
1691         int *count = (int *)context;
1692
1693         if (acpi_root_bridge(handle)) {
1694                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1695                                 handle_hotplug_event_bridge, NULL);
1696                         (*count)++;
1697         }
1698         return AE_OK ;
1699 }
1700
1701 static struct acpi_pci_driver acpi_pci_hp_driver = {
1702         .add =          add_bridge,
1703         .remove =       remove_bridge,
1704 };
1705
1706 /**
1707  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1708  *
1709  */
1710 int __init acpiphp_glue_init(void)
1711 {
1712         int num = 0;
1713
1714         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1715                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1716
1717         if (num <= 0)
1718                 return -1;
1719         else
1720                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1721
1722         return 0;
1723 }
1724
1725
1726 /**
1727  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1728  *
1729  * This function frees all data allocated in acpiphp_glue_init()
1730  */
1731 void  acpiphp_glue_exit(void)
1732 {
1733         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1734 }
1735
1736
1737 /**
1738  * acpiphp_get_num_slots - count number of slots in a system
1739  */
1740 int __init acpiphp_get_num_slots(void)
1741 {
1742         struct acpiphp_bridge *bridge;
1743         int num_slots = 0;
1744
1745         list_for_each_entry (bridge, &bridge_list, list) {
1746                 dbg("Bus %04x:%02x has %d slot%s\n",
1747                                 pci_domain_nr(bridge->pci_bus),
1748                                 bridge->pci_bus->number, bridge->nr_slots,
1749                                 bridge->nr_slots == 1 ? "" : "s");
1750                 num_slots += bridge->nr_slots;
1751         }
1752
1753         dbg("Total %d slots\n", num_slots);
1754         return num_slots;
1755 }
1756
1757
1758 #if 0
1759 /**
1760  * acpiphp_for_each_slot - call function for each slot
1761  * @fn: callback function
1762  * @data: context to be passed to callback function
1763  *
1764  */
1765 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1766 {
1767         struct list_head *node;
1768         struct acpiphp_bridge *bridge;
1769         struct acpiphp_slot *slot;
1770         int retval = 0;
1771
1772         list_for_each (node, &bridge_list) {
1773                 bridge = (struct acpiphp_bridge *)node;
1774                 for (slot = bridge->slots; slot; slot = slot->next) {
1775                         retval = fn(slot, data);
1776                         if (!retval)
1777                                 goto err_exit;
1778                 }
1779         }
1780
1781  err_exit:
1782         return retval;
1783 }
1784 #endif
1785
1786
1787 /**
1788  * acpiphp_enable_slot - power on slot
1789  */
1790 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1791 {
1792         int retval;
1793
1794         mutex_lock(&slot->crit_sect);
1795
1796         /* wake up all functions */
1797         retval = power_on_slot(slot);
1798         if (retval)
1799                 goto err_exit;
1800
1801         if (get_slot_status(slot) == ACPI_STA_ALL) {
1802                 /* configure all functions */
1803                 retval = enable_device(slot);
1804                 if (retval)
1805                         power_off_slot(slot);
1806         } else {
1807                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__);
1808                 power_off_slot(slot);
1809         }
1810
1811  err_exit:
1812         mutex_unlock(&slot->crit_sect);
1813         return retval;
1814 }
1815
1816 /**
1817  * acpiphp_disable_slot - power off slot
1818  */
1819 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1820 {
1821         int retval = 0;
1822
1823         mutex_lock(&slot->crit_sect);
1824
1825         /* unconfigure all functions */
1826         retval = disable_device(slot);
1827         if (retval)
1828                 goto err_exit;
1829
1830         /* power off all functions */
1831         retval = power_off_slot(slot);
1832         if (retval)
1833                 goto err_exit;
1834
1835  err_exit:
1836         mutex_unlock(&slot->crit_sect);
1837         return retval;
1838 }
1839
1840
1841 /*
1842  * slot enabled:  1
1843  * slot disabled: 0
1844  */
1845 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1846 {
1847         return (slot->flags & SLOT_POWEREDON);
1848 }
1849
1850
1851 /*
1852  * latch   open:  1
1853  * latch closed:  0
1854  */
1855 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1856 {
1857         unsigned int sta;
1858
1859         sta = get_slot_status(slot);
1860
1861         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1862 }
1863
1864
1865 /*
1866  * adapter presence : 1
1867  *          absence : 0
1868  */
1869 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1870 {
1871         unsigned int sta;
1872
1873         sta = get_slot_status(slot);
1874
1875         return (sta == 0) ? 0 : 1;
1876 }
1877
1878
1879 /*
1880  * pci address (seg/bus/dev)
1881  */
1882 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1883 {
1884         u32 address;
1885         struct pci_bus *pci_bus = slot->bridge->pci_bus;
1886
1887         address = (pci_domain_nr(pci_bus) << 16) |
1888                   (pci_bus->number << 8) |
1889                   slot->device;
1890
1891         return address;
1892 }