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/smp_lock.h>
  50 #include <linux/mutex.h>
  51
  52 #include "../pci.h"
  53 #include "acpiphp.h"
  54
  55 static LIST_HEAD(bridge_list);
  56 static LIST_HEAD(ioapic_list);
  57 static DEFINE_SPINLOCK(ioapic_list_lock);
  58
  59 #define MY_NAME "acpiphp_glue"
  60
  61 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
  62 static void acpiphp_sanitize_bus(struct pci_bus *bus);
  63 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
  64 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
  65
  66
  67 /*
  68  * initialization & terminatation routines
  69  */
  70
  71 /**
  72  * is_ejectable - determine if a slot is ejectable
  73  * @handle: handle to acpi namespace
  74  *
  75  * Ejectable slot should satisfy at least these conditions:
  76  *
  77  *  1. has _ADR method
  78  *  2. has _EJ0 method
  79  *
  80  * optionally
  81  *
  82  *  1. has _STA method
  83  *  2. has _PS0 method
  84  *  3. has _PS3 method
  85  *  4. ..
  86  *
  87  */
  88 static int is_ejectable(acpi_handle handle)
  89 {
  90         acpi_status status;
  91         acpi_handle tmp;
  92
  93         status = acpi_get_handle(handle, "_ADR", &tmp);
  94         if (ACPI_FAILURE(status)) {
  95                 return 0;
  96         }
  97
  98         status = acpi_get_handle(handle, "_EJ0", &tmp);
  99         if (ACPI_FAILURE(status)) {
 100                 return 0;
 101         }
 102
 103         return 1;
 104 }
 105
 106
 107 /* callback routine to check the existence of ejectable slots */
 108 static acpi_status
 109 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 110 {
 111         int *count = (int *)context;
 112
 113         if (is_ejectable(handle)) {
 114                 (*count)++;
 115                 /* only one ejectable slot is enough */
 116                 return AE_CTRL_TERMINATE;
 117         } else {
 118                 return AE_OK;
 119         }
 120 }
 121
 122 /* callback routine to check for the existance of a pci dock device */
 123 static acpi_status
 124 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 125 {
 126         int *count = (int *)context;
 127
 128         if (is_dock_device(handle)) {
 129                 (*count)++;
 130                 return AE_CTRL_TERMINATE;
 131         } else {
 132                 return AE_OK;
 133         }
 134 }
 135
 136
 137
 138
 139 /*
 140  * the _DCK method can do funny things... and sometimes not
 141  * hah-hah funny.
 142  *
 143  * TBD - figure out a way to only call fixups for
 144  * systems that require them.
 145  */
 146 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
 147         void *v)
 148 {
 149         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
 150         struct pci_bus *bus = func->slot->bridge->pci_bus;
 151         u32 buses;
 152
 153         if (!bus->self)
 154                 return  NOTIFY_OK;
 155
 156         /* fixup bad _DCK function that rewrites
 157          * secondary bridge on slot
 158          */
 159         pci_read_config_dword(bus->self,
 160                         PCI_PRIMARY_BUS,
 161                         &buses);
 162
 163         if (((buses >> 8) & 0xff) != bus->secondary) {
 164                 buses = (buses & 0xff000000)
 165                         | ((unsigned int)(bus->primary)     <<  0)
 166                         | ((unsigned int)(bus->secondary)   <<  8)
 167                         | ((unsigned int)(bus->subordinate) << 16);
 168                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
 169         }
 170         return NOTIFY_OK;
 171 }
 172
 173
 174
 175
 176 /* callback routine to register each ACPI PCI slot object */
 177 static acpi_status
 178 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 179 {
 180         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 181         struct acpiphp_slot *slot;
 182         struct acpiphp_func *newfunc;
 183         acpi_handle tmp;
 184         acpi_status status = AE_OK;
 185         unsigned long adr, sun;
 186         int device, function, retval;
 187
 188         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 189
 190         if (ACPI_FAILURE(status))
 191                 return AE_OK;
 192
 193         status = acpi_get_handle(handle, "_EJ0", &tmp);
 194
 195         if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
 196                 return AE_OK;
 197
 198         device = (adr >> 16) & 0xffff;
 199         function = adr & 0xffff;
 200
 201         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 202         if (!newfunc)
 203                 return AE_NO_MEMORY;
 204
 205         INIT_LIST_HEAD(&newfunc->sibling);
 206         newfunc->handle = handle;
 207         newfunc->function = function;
 208         if (ACPI_SUCCESS(status))
 209                 newfunc->flags = FUNC_HAS_EJ0;
 210
 211         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 212                 newfunc->flags |= FUNC_HAS_STA;
 213
 214         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 215                 newfunc->flags |= FUNC_HAS_PS0;
 216
 217         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 218                 newfunc->flags |= FUNC_HAS_PS3;
 219
 220         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 221                 newfunc->flags |= FUNC_HAS_DCK;
 222
 223         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 224         if (ACPI_FAILURE(status)) {
 225                 /*
 226                  * use the count of the number of slots we've found
 227                  * for the number of the slot
 228                  */
 229                 sun = bridge->nr_slots+1;
 230         }
 231
 232         /* search for objects that share the same slot */
 233         for (slot = bridge->slots; slot; slot = slot->next)
 234                 if (slot->device == device) {
 235                         if (slot->sun != sun)
 236                                 warn("sibling found, but _SUN doesn't match!\n");
 237                         break;
 238                 }
 239
 240         if (!slot) {
 241                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 242                 if (!slot) {
 243                         kfree(newfunc);
 244                         return AE_NO_MEMORY;
 245                 }
 246
 247                 slot->bridge = bridge;
 248                 slot->device = device;
 249                 slot->sun = sun;
 250                 INIT_LIST_HEAD(&slot->funcs);
 251                 mutex_init(&slot->crit_sect);
 252
 253                 slot->next = bridge->slots;
 254                 bridge->slots = slot;
 255
 256                 bridge->nr_slots++;
 257
 258                 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 259                                 slot->sun, pci_domain_nr(bridge->pci_bus),
 260                                 bridge->pci_bus->number, slot->device);
 261                 retval = acpiphp_register_hotplug_slot(slot);
 262                 if (retval) {
 263                         warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
 264                         goto err_exit;
 265                 }
 266         }
 267
 268         newfunc->slot = slot;
 269         list_add_tail(&newfunc->sibling, &slot->funcs);
 270
 271         /* associate corresponding pci_dev */
 272         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 273                                          PCI_DEVFN(device, function));
 274         if (newfunc->pci_dev) {
 275                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 276         }
 277
 278         if (is_dock_device(handle)) {
 279                 /* we don't want to call this device's _EJ0
 280                  * because we want the dock notify handler
 281                  * to call it after it calls _DCK
 282                  */
 283                 newfunc->flags &= ~FUNC_HAS_EJ0;
 284                 if (register_hotplug_dock_device(handle,
 285                         handle_hotplug_event_func, newfunc))
 286                         dbg("failed to register dock device\n");
 287
 288                 /* we need to be notified when dock events happen
 289                  * outside of the hotplug operation, since we may
 290                  * need to do fixups before we can hotplug.
 291                  */
 292                 newfunc->nb.notifier_call = post_dock_fixups;
 293                 if (register_dock_notifier(&newfunc->nb))
 294                         dbg("failed to register a dock notifier");
 295         }
 296
 297         /* install notify handler */
 298         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 299                 status = acpi_install_notify_handler(handle,
 300                                              ACPI_SYSTEM_NOTIFY,
 301                                              handle_hotplug_event_func,
 302                                              newfunc);
 303
 304                 if (ACPI_FAILURE(status))
 305                         err("failed to register interrupt notify handler\n");
 306         } else
 307                 status = AE_OK;
 308
 309         return status;
 310
 311  err_exit:
 312         bridge->nr_slots--;
 313         bridge->slots = slot->next;
 314         kfree(slot);
 315         kfree(newfunc);
 316
 317         return AE_OK;
 318 }
 319
 320
 321 /* see if it's worth looking at this bridge */
 322 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 323 {
 324         acpi_status status;
 325         int count;
 326
 327         count = 0;
 328
 329         /* only check slots defined directly below bridge object */
 330         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 331                                      is_ejectable_slot, (void *)&count, NULL);
 332
 333         /*
 334          * we also need to add this bridge if there is a dock bridge or
 335          * other pci device on a dock station (removable)
 336          */
 337         if (!count)
 338                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
 339                                 (u32)1, is_pci_dock_device, (void *)&count,
 340                                 NULL);
 341
 342         return count;
 343 }
 344
 345
 346 /* decode ACPI 2.0 _HPP hot plug parameters */
 347 static void decode_hpp(struct acpiphp_bridge *bridge)
 348 {
 349         acpi_status status;
 350
 351         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 352         if (ACPI_FAILURE(status) ||
 353             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 354                 /* use default numbers */
 355                 printk(KERN_WARNING
 356                        "%s: Could not get hotplug parameters. Use defaults\n",
 357                        __FUNCTION__);
 358                 bridge->hpp.t0 = &bridge->hpp.type0_data;
 359                 bridge->hpp.t0->revision = 0;
 360                 bridge->hpp.t0->cache_line_size = 0x10;
 361                 bridge->hpp.t0->latency_timer = 0x40;
 362                 bridge->hpp.t0->enable_serr = 0;
 363                 bridge->hpp.t0->enable_perr = 0;
 364         }
 365 }
 366
 367
 368
 369 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 370 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 371 {
 372         acpi_status status;
 373
 374         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 375         decode_hpp(bridge);
 376
 377         /* must be added to the list prior to calling register_slot */
 378         list_add(&bridge->list, &bridge_list);
 379
 380         /* register all slot objects under this bridge */
 381         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 382                                      register_slot, bridge, NULL);
 383         if (ACPI_FAILURE(status)) {
 384                 list_del(&bridge->list);
 385                 return;
 386         }
 387
 388         /* install notify handler */
 389         if (bridge->type != BRIDGE_TYPE_HOST) {
 390                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 391                         status = acpi_remove_notify_handler(bridge->func->handle,
 392                                                 ACPI_SYSTEM_NOTIFY,
 393                                                 handle_hotplug_event_func);
 394                         if (ACPI_FAILURE(status))
 395                                 err("failed to remove notify handler\n");
 396                 }
 397                 status = acpi_install_notify_handler(bridge->handle,
 398                                              ACPI_SYSTEM_NOTIFY,
 399                                              handle_hotplug_event_bridge,
 400                                              bridge);
 401
 402                 if (ACPI_FAILURE(status)) {
 403                         err("failed to register interrupt notify handler\n");
 404                 }
 405         }
 406 }
 407
 408
 409 /* find acpiphp_func from acpiphp_bridge */
 410 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 411 {
 412         struct list_head *node, *l;
 413         struct acpiphp_bridge *bridge;
 414         struct acpiphp_slot *slot;
 415         struct acpiphp_func *func;
 416
 417         list_for_each(node, &bridge_list) {
 418                 bridge = list_entry(node, struct acpiphp_bridge, list);
 419                 for (slot = bridge->slots; slot; slot = slot->next) {
 420                         list_for_each(l, &slot->funcs) {
 421                                 func = list_entry(l, struct acpiphp_func,
 422                                                         sibling);
 423                                 if (func->handle == handle)
 424                                         return func;
 425                         }
 426                 }
 427         }
 428
 429         return NULL;
 430 }
 431
 432
 433 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 434 {
 435         acpi_handle dummy_handle;
 436
 437         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 438                                         "_STA", &dummy_handle)))
 439                 bridge->flags |= BRIDGE_HAS_STA;
 440
 441         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 442                                         "_EJ0", &dummy_handle)))
 443                 bridge->flags |= BRIDGE_HAS_EJ0;
 444
 445         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 446                                         "_PS0", &dummy_handle)))
 447                 bridge->flags |= BRIDGE_HAS_PS0;
 448
 449         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 450                                         "_PS3", &dummy_handle)))
 451                 bridge->flags |= BRIDGE_HAS_PS3;
 452
 453         /* is this ejectable p2p bridge? */
 454         if (bridge->flags & BRIDGE_HAS_EJ0) {
 455                 struct acpiphp_func *func;
 456
 457                 dbg("found ejectable p2p bridge\n");
 458
 459                 /* make link between PCI bridge and PCI function */
 460                 func = acpiphp_bridge_handle_to_function(bridge->handle);
 461                 if (!func)
 462                         return;
 463                 bridge->func = func;
 464                 func->bridge = bridge;
 465         }
 466 }
 467
 468
 469 /* allocate and initialize host bridge data structure */
 470 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 471 {
 472         struct acpiphp_bridge *bridge;
 473
 474         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 475         if (bridge == NULL)
 476                 return;
 477
 478         bridge->type = BRIDGE_TYPE_HOST;
 479         bridge->handle = handle;
 480
 481         bridge->pci_bus = pci_bus;
 482
 483         spin_lock_init(&bridge->res_lock);
 484
 485         init_bridge_misc(bridge);
 486 }
 487
 488
 489 /* allocate and initialize PCI-to-PCI bridge data structure */
 490 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 491 {
 492         struct acpiphp_bridge *bridge;
 493
 494         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 495         if (bridge == NULL) {
 496                 err("out of memory\n");
 497                 return;
 498         }
 499
 500         bridge->type = BRIDGE_TYPE_P2P;
 501         bridge->handle = handle;
 502         config_p2p_bridge_flags(bridge);
 503
 504         bridge->pci_dev = pci_dev_get(pci_dev);
 505         bridge->pci_bus = pci_dev->subordinate;
 506         if (!bridge->pci_bus) {
 507                 err("This is not a PCI-to-PCI bridge!\n");
 508                 goto err;
 509         }
 510
 511         spin_lock_init(&bridge->res_lock);
 512
 513         init_bridge_misc(bridge);
 514         return;
 515  err:
 516         pci_dev_put(pci_dev);
 517         kfree(bridge);
 518         return;
 519 }
 520
 521
 522 /* callback routine to find P2P bridges */
 523 static acpi_status
 524 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 525 {
 526         acpi_status status;
 527         acpi_handle dummy_handle;
 528         unsigned long tmp;
 529         int device, function;
 530         struct pci_dev *dev;
 531         struct pci_bus *pci_bus = context;
 532
 533         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 534         if (ACPI_FAILURE(status))
 535                 return AE_OK;           /* continue */
 536
 537         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 538         if (ACPI_FAILURE(status)) {
 539                 dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
 540                 return AE_OK;
 541         }
 542
 543         device = (tmp >> 16) & 0xffff;
 544         function = tmp & 0xffff;
 545
 546         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 547
 548         if (!dev || !dev->subordinate)
 549                 goto out;
 550
 551         /* check if this bridge has ejectable slots */
 552         if ((detect_ejectable_slots(handle) > 0)) {
 553                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 554                 add_p2p_bridge(handle, dev);
 555         }
 556
 557         /* search P2P bridges under this p2p bridge */
 558         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 559                                      find_p2p_bridge, dev->subordinate, NULL);
 560         if (ACPI_FAILURE(status))
 561                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 562
 563  out:
 564         pci_dev_put(dev);
 565         return AE_OK;
 566 }
 567
 568
 569 /* find hot-pluggable slots, and then find P2P bridge */
 570 static int add_bridge(acpi_handle handle)
 571 {
 572         acpi_status status;
 573         unsigned long tmp;
 574         int seg, bus;
 575         acpi_handle dummy_handle;
 576         struct pci_bus *pci_bus;
 577
 578         /* if the bridge doesn't have _STA, we assume it is always there */
 579         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 580         if (ACPI_SUCCESS(status)) {
 581                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 582                 if (ACPI_FAILURE(status)) {
 583                         dbg("%s: _STA evaluation failure\n", __FUNCTION__);
 584                         return 0;
 585                 }
 586                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 587                         /* don't register this object */
 588                         return 0;
 589         }
 590
 591         /* get PCI segment number */
 592         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 593
 594         seg = ACPI_SUCCESS(status) ? tmp : 0;
 595
 596         /* get PCI bus number */
 597         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 598
 599         if (ACPI_SUCCESS(status)) {
 600                 bus = tmp;
 601         } else {
 602                 warn("can't get bus number, assuming 0\n");
 603                 bus = 0;
 604         }
 605
 606         pci_bus = pci_find_bus(seg, bus);
 607         if (!pci_bus) {
 608                 err("Can't find bus %04x:%02x\n", seg, bus);
 609                 return 0;
 610         }
 611
 612         /* check if this bridge has ejectable slots */
 613         if (detect_ejectable_slots(handle) > 0) {
 614                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 615                 add_host_bridge(handle, pci_bus);
 616         }
 617
 618         /* search P2P bridges under this host bridge */
 619         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 620                                      find_p2p_bridge, pci_bus, NULL);
 621
 622         if (ACPI_FAILURE(status))
 623                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 624
 625         return 0;
 626 }
 627
 628 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 629 {
 630         struct list_head *head;
 631         list_for_each(head, &bridge_list) {
 632                 struct acpiphp_bridge *bridge = list_entry(head,
 633                                                 struct acpiphp_bridge, list);
 634                 if (bridge->handle == handle)
 635                         return bridge;
 636         }
 637
 638         return NULL;
 639 }
 640
 641 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 642 {
 643         struct list_head *list, *tmp;
 644         struct acpiphp_slot *slot;
 645         acpi_status status;
 646         acpi_handle handle = bridge->handle;
 647
 648         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 649                                             handle_hotplug_event_bridge);
 650         if (ACPI_FAILURE(status))
 651                 err("failed to remove notify handler\n");
 652
 653         if ((bridge->type != BRIDGE_TYPE_HOST) &&
 654             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
 655                 status = acpi_install_notify_handler(bridge->func->handle,
 656                                                 ACPI_SYSTEM_NOTIFY,
 657                                                 handle_hotplug_event_func,
 658                                                 bridge->func);
 659                 if (ACPI_FAILURE(status))
 660                         err("failed to install interrupt notify handler\n");
 661         }
 662
 663         slot = bridge->slots;
 664         while (slot) {
 665                 struct acpiphp_slot *next = slot->next;
 666                 list_for_each_safe (list, tmp, &slot->funcs) {
 667                         struct acpiphp_func *func;
 668                         func = list_entry(list, struct acpiphp_func, sibling);
 669                         if (is_dock_device(func->handle)) {
 670                                 unregister_hotplug_dock_device(func->handle);
 671                                 unregister_dock_notifier(&func->nb);
 672                         }
 673                         if (!(func->flags & FUNC_HAS_DCK)) {
 674                                 status = acpi_remove_notify_handler(func->handle,
 675                                                 ACPI_SYSTEM_NOTIFY,
 676                                                 handle_hotplug_event_func);
 677                                 if (ACPI_FAILURE(status))
 678                                         err("failed to remove notify handler\n");
 679                         }
 680                         pci_dev_put(func->pci_dev);
 681                         list_del(list);
 682                         kfree(func);
 683                 }
 684                 acpiphp_unregister_hotplug_slot(slot);
 685                 list_del(&slot->funcs);
 686                 kfree(slot);
 687                 slot = next;
 688         }
 689
 690         pci_dev_put(bridge->pci_dev);
 691         list_del(&bridge->list);
 692         kfree(bridge);
 693 }
 694
 695 static acpi_status
 696 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 697 {
 698         struct acpiphp_bridge *bridge;
 699
 700         /* cleanup p2p bridges under this P2P bridge
 701            in a depth-first manner */
 702         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 703                                 cleanup_p2p_bridge, NULL, NULL);
 704
 705         if (!(bridge = acpiphp_handle_to_bridge(handle)))
 706                 return AE_OK;
 707         cleanup_bridge(bridge);
 708         return AE_OK;
 709 }
 710
 711 static void remove_bridge(acpi_handle handle)
 712 {
 713         struct acpiphp_bridge *bridge;
 714
 715         /* cleanup p2p bridges under this host bridge
 716            in a depth-first manner */
 717         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 718                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 719
 720         bridge = acpiphp_handle_to_bridge(handle);
 721         if (bridge)
 722                 cleanup_bridge(bridge);
 723 }
 724
 725 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 726 {
 727         struct acpi_pci_id id;
 728         struct pci_bus *bus;
 729         struct pci_dev *dev;
 730
 731         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 732                 return NULL;
 733
 734         bus = pci_find_bus(id.segment, id.bus);
 735         if (!bus)
 736                 return NULL;
 737
 738         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 739         if (!dev)
 740                 return NULL;
 741
 742         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 743             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 744         {
 745                 pci_dev_put(dev);
 746                 return NULL;
 747         }
 748
 749         return dev;
 750 }
 751
 752 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 753 {
 754         acpi_status status;
 755         int result = -1;
 756         unsigned long gsb;
 757         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 758         union acpi_object *obj;
 759         void *table;
 760
 761         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 762         if (ACPI_SUCCESS(status)) {
 763                 *gsi_base = (u32)gsb;
 764                 return 0;
 765         }
 766
 767         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 768         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 769                 return -1;
 770
 771         obj = buffer.pointer;
 772         if (obj->type != ACPI_TYPE_BUFFER)
 773                 goto out;
 774
 775         table = obj->buffer.pointer;
 776         switch (((acpi_table_entry_header *)table)->type) {
 777         case ACPI_MADT_IOSAPIC:
 778                 *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base;
 779                 result = 0;
 780                 break;
 781         case ACPI_MADT_IOAPIC:
 782                 *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base;
 783                 result = 0;
 784                 break;
 785         default:
 786                 break;
 787         }
 788  out:
 789         kfree(buffer.pointer);
 790         return result;
 791 }
 792
 793 static acpi_status
 794 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 795 {
 796         acpi_status status;
 797         unsigned long sta;
 798         acpi_handle tmp;
 799         struct pci_dev *pdev;
 800         u32 gsi_base;
 801         u64 phys_addr;
 802         struct acpiphp_ioapic *ioapic;
 803
 804         /* Evaluate _STA if present */
 805         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 806         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 807                 return AE_CTRL_DEPTH;
 808
 809         /* Scan only PCI bus scope */
 810         status = acpi_get_handle(handle, "_HID", &tmp);
 811         if (ACPI_SUCCESS(status))
 812                 return AE_CTRL_DEPTH;
 813
 814         if (get_gsi_base(handle, &gsi_base))
 815                 return AE_OK;
 816
 817         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 818         if (!ioapic)
 819                 return AE_NO_MEMORY;
 820
 821         pdev = get_apic_pci_info(handle);
 822         if (!pdev)
 823                 goto exit_kfree;
 824
 825         if (pci_enable_device(pdev))
 826                 goto exit_pci_dev_put;
 827
 828         pci_set_master(pdev);
 829
 830         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 831                 goto exit_pci_disable_device;
 832
 833         phys_addr = pci_resource_start(pdev, 0);
 834         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 835                 goto exit_pci_release_region;
 836
 837         ioapic->gsi_base = gsi_base;
 838         ioapic->dev = pdev;
 839         spin_lock(&ioapic_list_lock);
 840         list_add_tail(&ioapic->list, &ioapic_list);
 841         spin_unlock(&ioapic_list_lock);
 842
 843         return AE_OK;
 844
 845  exit_pci_release_region:
 846         pci_release_region(pdev, 0);
 847  exit_pci_disable_device:
 848         pci_disable_device(pdev);
 849  exit_pci_dev_put:
 850         pci_dev_put(pdev);
 851  exit_kfree:
 852         kfree(ioapic);
 853
 854         return AE_OK;
 855 }
 856
 857 static acpi_status
 858 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 859 {
 860         acpi_status status;
 861         unsigned long sta;
 862         acpi_handle tmp;
 863         u32 gsi_base;
 864         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 865
 866         /* Evaluate _STA if present */
 867         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 868         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 869                 return AE_CTRL_DEPTH;
 870
 871         /* Scan only PCI bus scope */
 872         status = acpi_get_handle(handle, "_HID", &tmp);
 873         if (ACPI_SUCCESS(status))
 874                 return AE_CTRL_DEPTH;
 875
 876         if (get_gsi_base(handle, &gsi_base))
 877                 return AE_OK;
 878
 879         acpi_unregister_ioapic(handle, gsi_base);
 880
 881         spin_lock(&ioapic_list_lock);
 882         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 883                 if (pos->gsi_base != gsi_base)
 884                         continue;
 885                 ioapic = pos;
 886                 list_del(&ioapic->list);
 887                 break;
 888         }
 889         spin_unlock(&ioapic_list_lock);
 890
 891         if (!ioapic)
 892                 return AE_OK;
 893
 894         pci_release_region(ioapic->dev, 0);
 895         pci_disable_device(ioapic->dev);
 896         pci_dev_put(ioapic->dev);
 897         kfree(ioapic);
 898
 899         return AE_OK;
 900 }
 901
 902 static int acpiphp_configure_ioapics(acpi_handle handle)
 903 {
 904         ioapic_add(handle, 0, NULL, NULL);
 905         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 906                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 907         return 0;
 908 }
 909
 910 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 911 {
 912         ioapic_remove(handle, 0, NULL, NULL);
 913         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 914                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 915         return 0;
 916 }
 917
 918 static int power_on_slot(struct acpiphp_slot *slot)
 919 {
 920         acpi_status status;
 921         struct acpiphp_func *func;
 922         struct list_head *l;
 923         int retval = 0;
 924
 925         /* if already enabled, just skip */
 926         if (slot->flags & SLOT_POWEREDON)
 927                 goto err_exit;
 928
 929         list_for_each (l, &slot->funcs) {
 930                 func = list_entry(l, struct acpiphp_func, sibling);
 931
 932                 if (func->flags & FUNC_HAS_PS0) {
 933                         dbg("%s: executing _PS0\n", __FUNCTION__);
 934                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 935                         if (ACPI_FAILURE(status)) {
 936                                 warn("%s: _PS0 failed\n", __FUNCTION__);
 937                                 retval = -1;
 938                                 goto err_exit;
 939                         } else
 940                                 break;
 941                 }
 942         }
 943
 944         /* TBD: evaluate _STA to check if the slot is enabled */
 945
 946         slot->flags |= SLOT_POWEREDON;
 947
 948  err_exit:
 949         return retval;
 950 }
 951
 952
 953 static int power_off_slot(struct acpiphp_slot *slot)
 954 {
 955         acpi_status status;
 956         struct acpiphp_func *func;
 957         struct list_head *l;
 958
 959         int retval = 0;
 960
 961         /* if already disabled, just skip */
 962         if ((slot->flags & SLOT_POWEREDON) == 0)
 963                 goto err_exit;
 964
 965         list_for_each (l, &slot->funcs) {
 966                 func = list_entry(l, struct acpiphp_func, sibling);
 967
 968                 if (func->flags & FUNC_HAS_PS3) {
 969                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 970                         if (ACPI_FAILURE(status)) {
 971                                 warn("%s: _PS3 failed\n", __FUNCTION__);
 972                                 retval = -1;
 973                                 goto err_exit;
 974                         } else
 975                                 break;
 976                 }
 977         }
 978
 979         /* TBD: evaluate _STA to check if the slot is disabled */
 980
 981         slot->flags &= (~SLOT_POWEREDON);
 982
 983  err_exit:
 984         return retval;
 985 }
 986
 987
 988
 989 /**
 990  * acpiphp_max_busnr - return the highest reserved bus number under
 991  * the given bus.
 992  * @bus: bus to start search with
 993  *
 994  */
 995 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
 996 {
 997         struct list_head *tmp;
 998         unsigned char max, n;
 999
1000         /*
1001          * pci_bus_max_busnr will return the highest
1002          * reserved busnr for all these children.
1003          * that is equivalent to the bus->subordinate
1004          * value.  We don't want to use the parent's
1005          * bus->subordinate value because it could have
1006          * padding in it.
1007          */
1008         max = bus->secondary;
1009
1010         list_for_each(tmp, &bus->children) {
1011                 n = pci_bus_max_busnr(pci_bus_b(tmp));
1012                 if (n > max)
1013                         max = n;
1014         }
1015         return max;
1016 }
1017
1018
1019 /**
1020  * acpiphp_bus_add - add a new bus to acpi subsystem
1021  * @func: acpiphp_func of the bridge
1022  *
1023  */
1024 static int acpiphp_bus_add(struct acpiphp_func *func)
1025 {
1026         acpi_handle phandle;
1027         struct acpi_device *device, *pdevice;
1028         int ret_val;
1029
1030         acpi_get_parent(func->handle, &phandle);
1031         if (acpi_bus_get_device(phandle, &pdevice)) {
1032                 dbg("no parent device, assuming NULL\n");
1033                 pdevice = NULL;
1034         }
1035         if (!acpi_bus_get_device(func->handle, &device)) {
1036                 dbg("bus exists... trim\n");
1037                 /* this shouldn't be in here, so remove
1038                  * the bus then re-add it...
1039                  */
1040                 ret_val = acpi_bus_trim(device, 1);
1041                 dbg("acpi_bus_trim return %x\n", ret_val);
1042         }
1043
1044         ret_val = acpi_bus_add(&device, pdevice, func->handle,
1045                 ACPI_BUS_TYPE_DEVICE);
1046         if (ret_val) {
1047                 dbg("error adding bus, %x\n",
1048                         -ret_val);
1049                 goto acpiphp_bus_add_out;
1050         }
1051         /*
1052          * try to start anyway.  We could have failed to add
1053          * simply because this bus had previously been added
1054          * on another add.  Don't bother with the return value
1055          * we just keep going.
1056          */
1057         ret_val = acpi_bus_start(device);
1058
1059 acpiphp_bus_add_out:
1060         return ret_val;
1061 }
1062
1063
1064 /**
1065  * acpiphp_bus_trim - trim a bus from acpi subsystem
1066  * @handle: handle to acpi namespace
1067  *
1068  */
1069 static int acpiphp_bus_trim(acpi_handle handle)
1070 {
1071         struct acpi_device *device;
1072         int retval;
1073
1074         retval = acpi_bus_get_device(handle, &device);
1075         if (retval) {
1076                 dbg("acpi_device not found\n");
1077                 return retval;
1078         }
1079
1080         retval = acpi_bus_trim(device, 1);
1081         if (retval)
1082                 err("cannot remove from acpi list\n");
1083
1084         return retval;
1085 }
1086
1087 /**
1088  * enable_device - enable, configure a slot
1089  * @slot: slot to be enabled
1090  *
1091  * This function should be called per *physical slot*,
1092  * not per each slot object in ACPI namespace.
1093  *
1094  */
1095 static int enable_device(struct acpiphp_slot *slot)
1096 {
1097         struct pci_dev *dev;
1098         struct pci_bus *bus = slot->bridge->pci_bus;
1099         struct list_head *l;
1100         struct acpiphp_func *func;
1101         int retval = 0;
1102         int num, max, pass;
1103         acpi_status status;
1104
1105         if (slot->flags & SLOT_ENABLED)
1106                 goto err_exit;
1107
1108         /* sanity check: dev should be NULL when hot-plugged in */
1109         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1110         if (dev) {
1111                 /* This case shouldn't happen */
1112                 err("pci_dev structure already exists.\n");
1113                 pci_dev_put(dev);
1114                 retval = -1;
1115                 goto err_exit;
1116         }
1117
1118         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1119         if (num == 0) {
1120                 err("No new device found\n");
1121                 retval = -1;
1122                 goto err_exit;
1123         }
1124
1125         max = acpiphp_max_busnr(bus);
1126         for (pass = 0; pass < 2; pass++) {
1127                 list_for_each_entry(dev, &bus->devices, bus_list) {
1128                         if (PCI_SLOT(dev->devfn) != slot->device)
1129                                 continue;
1130                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1131                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1132                                 max = pci_scan_bridge(bus, dev, max, pass);
1133                                 if (pass && dev->subordinate)
1134                                         pci_bus_size_bridges(dev->subordinate);
1135                         }
1136                 }
1137         }
1138
1139         list_for_each (l, &slot->funcs) {
1140                 func = list_entry(l, struct acpiphp_func, sibling);
1141                 acpiphp_bus_add(func);
1142         }
1143
1144         pci_bus_assign_resources(bus);
1145         acpiphp_sanitize_bus(bus);
1146         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1147         list_for_each_entry(func, &slot->funcs, sibling)
1148                 acpiphp_configure_ioapics(func->handle);
1149         pci_enable_bridges(bus);
1150         pci_bus_add_devices(bus);
1151
1152         /* associate pci_dev to our representation */
1153         list_for_each (l, &slot->funcs) {
1154                 func = list_entry(l, struct acpiphp_func, sibling);
1155                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1156                                                         func->function));
1157                 if (!func->pci_dev)
1158                         continue;
1159
1160                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1161                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1162                         continue;
1163
1164                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1165                 if (ACPI_FAILURE(status))
1166                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1167                                 status);
1168         }
1169
1170         slot->flags |= SLOT_ENABLED;
1171
1172  err_exit:
1173         return retval;
1174 }
1175
1176 static void disable_bridges(struct pci_bus *bus)
1177 {
1178         struct pci_dev *dev;
1179         list_for_each_entry(dev, &bus->devices, bus_list) {
1180                 if (dev->subordinate) {
1181                         disable_bridges(dev->subordinate);
1182                         pci_disable_device(dev);
1183                 }
1184         }
1185 }
1186
1187 /**
1188  * disable_device - disable a slot
1189  */
1190 static int disable_device(struct acpiphp_slot *slot)
1191 {
1192         int retval = 0;
1193         struct acpiphp_func *func;
1194         struct list_head *l;
1195
1196         /* is this slot already disabled? */
1197         if (!(slot->flags & SLOT_ENABLED))
1198                 goto err_exit;
1199
1200         list_for_each (l, &slot->funcs) {
1201                 func = list_entry(l, struct acpiphp_func, sibling);
1202
1203                 if (func->bridge) {
1204                         /* cleanup p2p bridges under this P2P bridge */
1205                         cleanup_p2p_bridge(func->bridge->handle,
1206                                                 (u32)1, NULL, NULL);
1207                         func->bridge = NULL;
1208                 }
1209
1210                 if (func->pci_dev) {
1211                         pci_stop_bus_device(func->pci_dev);
1212                         if (func->pci_dev->subordinate) {
1213                                 disable_bridges(func->pci_dev->subordinate);
1214                                 pci_disable_device(func->pci_dev);
1215                         }
1216                 }
1217         }
1218
1219         list_for_each (l, &slot->funcs) {
1220                 func = list_entry(l, struct acpiphp_func, sibling);
1221
1222                 acpiphp_unconfigure_ioapics(func->handle);
1223                 acpiphp_bus_trim(func->handle);
1224                 /* try to remove anyway.
1225                  * acpiphp_bus_add might have been failed */
1226
1227                 if (!func->pci_dev)
1228                         continue;
1229
1230                 pci_remove_bus_device(func->pci_dev);
1231                 pci_dev_put(func->pci_dev);
1232                 func->pci_dev = NULL;
1233         }
1234
1235         slot->flags &= (~SLOT_ENABLED);
1236
1237  err_exit:
1238         return retval;
1239 }
1240
1241
1242 /**
1243  * get_slot_status - get ACPI slot status
1244  *
1245  * if a slot has _STA for each function and if any one of them
1246  * returned non-zero status, return it
1247  *
1248  * if a slot doesn't have _STA and if any one of its functions'
1249  * configuration space is configured, return 0x0f as a _STA
1250  *
1251  * otherwise return 0
1252  */
1253 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1254 {
1255         acpi_status status;
1256         unsigned long sta = 0;
1257         u32 dvid;
1258         struct list_head *l;
1259         struct acpiphp_func *func;
1260
1261         list_for_each (l, &slot->funcs) {
1262                 func = list_entry(l, struct acpiphp_func, sibling);
1263
1264                 if (func->flags & FUNC_HAS_STA) {
1265                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1266                         if (ACPI_SUCCESS(status) && sta)
1267                                 break;
1268                 } else {
1269                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1270                                                   PCI_DEVFN(slot->device,
1271                                                             func->function),
1272                                                   PCI_VENDOR_ID, &dvid);
1273                         if (dvid != 0xffffffff) {
1274                                 sta = ACPI_STA_ALL;
1275                                 break;
1276                         }
1277                 }
1278         }
1279
1280         return (unsigned int)sta;
1281 }
1282
1283 /**
1284  * acpiphp_eject_slot - physically eject the slot
1285  */
1286 static int acpiphp_eject_slot(struct acpiphp_slot *slot)
1287 {
1288         acpi_status status;
1289         struct acpiphp_func *func;
1290         struct list_head *l;
1291         struct acpi_object_list arg_list;
1292         union acpi_object arg;
1293
1294         list_for_each (l, &slot->funcs) {
1295                 func = list_entry(l, struct acpiphp_func, sibling);
1296
1297                 /* We don't want to call _EJ0 on non-existing functions. */
1298                 if ((func->flags & FUNC_HAS_EJ0)) {
1299                         /* _EJ0 method take one argument */
1300                         arg_list.count = 1;
1301                         arg_list.pointer = &arg;
1302                         arg.type = ACPI_TYPE_INTEGER;
1303                         arg.integer.value = 1;
1304
1305                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1306                         if (ACPI_FAILURE(status)) {
1307                                 warn("%s: _EJ0 failed\n", __FUNCTION__);
1308                                 return -1;
1309                         } else
1310                                 break;
1311                 }
1312         }
1313         return 0;
1314 }
1315
1316 /**
1317  * acpiphp_check_bridge - re-enumerate devices
1318  *
1319  * Iterate over all slots under this bridge and make sure that if a
1320  * card is present they are enabled, and if not they are disabled.
1321  */
1322 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1323 {
1324         struct acpiphp_slot *slot;
1325         int retval = 0;
1326         int enabled, disabled;
1327
1328         enabled = disabled = 0;
1329
1330         for (slot = bridge->slots; slot; slot = slot->next) {
1331                 unsigned int status = get_slot_status(slot);
1332                 if (slot->flags & SLOT_ENABLED) {
1333                         if (status == ACPI_STA_ALL)
1334                                 continue;
1335                         retval = acpiphp_disable_slot(slot);
1336                         if (retval) {
1337                                 err("Error occurred in disabling\n");
1338                                 goto err_exit;
1339                         } else {
1340                                 acpiphp_eject_slot(slot);
1341                         }
1342                         disabled++;
1343                 } else {
1344                         if (status != ACPI_STA_ALL)
1345                                 continue;
1346                         retval = acpiphp_enable_slot(slot);
1347                         if (retval) {
1348                                 err("Error occurred in enabling\n");
1349                                 goto err_exit;
1350                         }
1351                         enabled++;
1352                 }
1353         }
1354
1355         dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
1356
1357  err_exit:
1358         return retval;
1359 }
1360
1361 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1362 {
1363         u16 pci_cmd, pci_bctl;
1364         struct pci_dev *cdev;
1365
1366         /* Program hpp values for this device */
1367         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1368                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1369                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1370                 return;
1371
1372         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1373                         bridge->hpp.t0->cache_line_size);
1374         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1375                         bridge->hpp.t0->latency_timer);
1376         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1377         if (bridge->hpp.t0->enable_serr)
1378                 pci_cmd |= PCI_COMMAND_SERR;
1379         else
1380                 pci_cmd &= ~PCI_COMMAND_SERR;
1381         if (bridge->hpp.t0->enable_perr)
1382                 pci_cmd |= PCI_COMMAND_PARITY;
1383         else
1384                 pci_cmd &= ~PCI_COMMAND_PARITY;
1385         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1386
1387         /* Program bridge control value and child devices */
1388         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1389                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1390                                 bridge->hpp.t0->latency_timer);
1391                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1392                 if (bridge->hpp.t0->enable_serr)
1393                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1394                 else
1395                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1396                 if (bridge->hpp.t0->enable_perr)
1397                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1398                 else
1399                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1400                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1401                 if (dev->subordinate) {
1402                         list_for_each_entry(cdev, &dev->subordinate->devices,
1403                                         bus_list)
1404                                 program_hpp(cdev, bridge);
1405                 }
1406         }
1407 }
1408
1409 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1410 {
1411         struct acpiphp_bridge bridge;
1412         struct pci_dev *dev;
1413
1414         memset(&bridge, 0, sizeof(bridge));
1415         bridge.handle = handle;
1416         bridge.pci_bus = bus;
1417         bridge.pci_dev = bus->self;
1418         decode_hpp(&bridge);
1419         list_for_each_entry(dev, &bus->devices, bus_list)
1420                 program_hpp(dev, &bridge);
1421
1422 }
1423
1424 /*
1425  * Remove devices for which we could not assign resources, call
1426  * arch specific code to fix-up the bus
1427  */
1428 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1429 {
1430         struct pci_dev *dev;
1431         int i;
1432         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1433
1434         list_for_each_entry(dev, &bus->devices, bus_list) {
1435                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1436                         struct resource *res = &dev->resource[i];
1437                         if ((res->flags & type_mask) && !res->start &&
1438                                         res->end) {
1439                                 /* Could not assign a required resources
1440                                  * for this device, remove it */
1441                                 pci_remove_bus_device(dev);
1442                                 break;
1443                         }
1444                 }
1445         }
1446 }
1447
1448 /* Program resources in newly inserted bridge */
1449 static int acpiphp_configure_bridge (acpi_handle handle)
1450 {
1451         struct acpi_pci_id pci_id;
1452         struct pci_bus *bus;
1453
1454         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1455                 err("cannot get PCI domain and bus number for bridge\n");
1456                 return -EINVAL;
1457         }
1458         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1459         if (!bus) {
1460                 err("cannot find bus %d:%d\n",
1461                                 pci_id.segment, pci_id.bus);
1462                 return -EINVAL;
1463         }
1464
1465         pci_bus_size_bridges(bus);
1466         pci_bus_assign_resources(bus);
1467         acpiphp_sanitize_bus(bus);
1468         acpiphp_set_hpp_values(handle, bus);
1469         pci_enable_bridges(bus);
1470         acpiphp_configure_ioapics(handle);
1471         return 0;
1472 }
1473
1474 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1475 {
1476         struct acpi_device *device, *pdevice;
1477         acpi_handle phandle;
1478
1479         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1480                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1481                 err("unexpected notification type %d\n", type);
1482                 return;
1483         }
1484
1485         acpi_get_parent(handle, &phandle);
1486         if (acpi_bus_get_device(phandle, &pdevice)) {
1487                 dbg("no parent device, assuming NULL\n");
1488                 pdevice = NULL;
1489         }
1490         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1491                 err("cannot add bridge to acpi list\n");
1492                 return;
1493         }
1494         if (!acpiphp_configure_bridge(handle) &&
1495                 !acpi_bus_start(device))
1496                 add_bridge(handle);
1497         else
1498                 err("cannot configure and start bridge\n");
1499
1500 }
1501
1502 /*
1503  * ACPI event handlers
1504  */
1505
1506 /**
1507  * handle_hotplug_event_bridge - handle ACPI event on bridges
1508  *
1509  * @handle: Notify()'ed acpi_handle
1510  * @type: Notify code
1511  * @context: pointer to acpiphp_bridge structure
1512  *
1513  * handles ACPI event notification on {host,p2p} bridges
1514  *
1515  */
1516 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1517 {
1518         struct acpiphp_bridge *bridge;
1519         char objname[64];
1520         struct acpi_buffer buffer = { .length = sizeof(objname),
1521                                       .pointer = objname };
1522         struct acpi_device *device;
1523
1524         if (acpi_bus_get_device(handle, &device)) {
1525                 /* This bridge must have just been physically inserted */
1526                 handle_bridge_insertion(handle, type);
1527                 return;
1528         }
1529
1530         bridge = acpiphp_handle_to_bridge(handle);
1531         if (!bridge) {
1532                 err("cannot get bridge info\n");
1533                 return;
1534         }
1535
1536         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1537
1538         switch (type) {
1539         case ACPI_NOTIFY_BUS_CHECK:
1540                 /* bus re-enumerate */
1541                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1542                 acpiphp_check_bridge(bridge);
1543                 break;
1544
1545         case ACPI_NOTIFY_DEVICE_CHECK:
1546                 /* device check */
1547                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1548                 acpiphp_check_bridge(bridge);
1549                 break;
1550
1551         case ACPI_NOTIFY_DEVICE_WAKE:
1552                 /* wake event */
1553                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1554                 break;
1555
1556         case ACPI_NOTIFY_EJECT_REQUEST:
1557                 /* request device eject */
1558                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1559                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1560                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1561                         struct acpiphp_slot *slot;
1562                         slot = bridge->func->slot;
1563                         if (!acpiphp_disable_slot(slot))
1564                                 acpiphp_eject_slot(slot);
1565                 }
1566                 break;
1567
1568         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1569                 printk(KERN_ERR "Device %s cannot be configured due"
1570                                 " to a frequency mismatch\n", objname);
1571                 break;
1572
1573         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1574                 printk(KERN_ERR "Device %s cannot be configured due"
1575                                 " to a bus mode mismatch\n", objname);
1576                 break;
1577
1578         case ACPI_NOTIFY_POWER_FAULT:
1579                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1580                                 objname);
1581                 break;
1582
1583         default:
1584                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1585                 break;
1586         }
1587 }
1588
1589 /**
1590  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1591  *
1592  * @handle: Notify()'ed acpi_handle
1593  * @type: Notify code
1594  * @context: pointer to acpiphp_func structure
1595  *
1596  * handles ACPI event notification on slots
1597  *
1598  */
1599 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1600 {
1601         struct acpiphp_func *func;
1602         char objname[64];
1603         struct acpi_buffer buffer = { .length = sizeof(objname),
1604                                       .pointer = objname };
1605
1606         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1607
1608         func = (struct acpiphp_func *)context;
1609
1610         switch (type) {
1611         case ACPI_NOTIFY_BUS_CHECK:
1612                 /* bus re-enumerate */
1613                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1614                 acpiphp_enable_slot(func->slot);
1615                 break;
1616
1617         case ACPI_NOTIFY_DEVICE_CHECK:
1618                 /* device check : re-enumerate from parent bus */
1619                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1620                 acpiphp_check_bridge(func->slot->bridge);
1621                 break;
1622
1623         case ACPI_NOTIFY_DEVICE_WAKE:
1624                 /* wake event */
1625                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1626                 break;
1627
1628         case ACPI_NOTIFY_EJECT_REQUEST:
1629                 /* request device eject */
1630                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1631                 if (!(acpiphp_disable_slot(func->slot)))
1632                         acpiphp_eject_slot(func->slot);
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 static acpi_status
1643 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1644 {
1645         int *count = (int *)context;
1646
1647         if (acpi_root_bridge(handle)) {
1648                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1649                                 handle_hotplug_event_bridge, NULL);
1650                         (*count)++;
1651         }
1652         return AE_OK ;
1653 }
1654
1655 static struct acpi_pci_driver acpi_pci_hp_driver = {
1656         .add =          add_bridge,
1657         .remove =       remove_bridge,
1658 };
1659
1660 /**
1661  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1662  *
1663  */
1664 int __init acpiphp_glue_init(void)
1665 {
1666         int num = 0;
1667
1668         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1669                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1670
1671         if (num <= 0)
1672                 return -1;
1673         else
1674                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1675
1676         return 0;
1677 }
1678
1679
1680 /**
1681  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1682  *
1683  * This function frees all data allocated in acpiphp_glue_init()
1684  */
1685 void __exit acpiphp_glue_exit(void)
1686 {
1687         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1688 }
1689
1690
1691 /**
1692  * acpiphp_get_num_slots - count number of slots in a system
1693  */
1694 int __init acpiphp_get_num_slots(void)
1695 {
1696         struct acpiphp_bridge *bridge;
1697         int num_slots = 0;
1698
1699         list_for_each_entry (bridge, &bridge_list, list) {
1700                 dbg("Bus %04x:%02x has %d slot%s\n",
1701                                 pci_domain_nr(bridge->pci_bus),
1702                                 bridge->pci_bus->number, bridge->nr_slots,
1703                                 bridge->nr_slots == 1 ? "" : "s");
1704                 num_slots += bridge->nr_slots;
1705         }
1706
1707         dbg("Total %d slots\n", num_slots);
1708         return num_slots;
1709 }
1710
1711
1712 #if 0
1713 /**
1714  * acpiphp_for_each_slot - call function for each slot
1715  * @fn: callback function
1716  * @data: context to be passed to callback function
1717  *
1718  */
1719 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1720 {
1721         struct list_head *node;
1722         struct acpiphp_bridge *bridge;
1723         struct acpiphp_slot *slot;
1724         int retval = 0;
1725
1726         list_for_each (node, &bridge_list) {
1727                 bridge = (struct acpiphp_bridge *)node;
1728                 for (slot = bridge->slots; slot; slot = slot->next) {
1729                         retval = fn(slot, data);
1730                         if (!retval)
1731                                 goto err_exit;
1732                 }
1733         }
1734
1735  err_exit:
1736         return retval;
1737 }
1738 #endif
1739
1740
1741 /**
1742  * acpiphp_enable_slot - power on slot
1743  */
1744 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1745 {
1746         int retval;
1747
1748         mutex_lock(&slot->crit_sect);
1749
1750         /* wake up all functions */
1751         retval = power_on_slot(slot);
1752         if (retval)
1753                 goto err_exit;
1754
1755         if (get_slot_status(slot) == ACPI_STA_ALL) {
1756                 /* configure all functions */
1757                 retval = enable_device(slot);
1758                 if (retval)
1759                         power_off_slot(slot);
1760         } else {
1761                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__);
1762                 power_off_slot(slot);
1763         }
1764
1765  err_exit:
1766         mutex_unlock(&slot->crit_sect);
1767         return retval;
1768 }
1769
1770 /**
1771  * acpiphp_disable_slot - power off slot
1772  */
1773 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1774 {
1775         int retval = 0;
1776
1777         mutex_lock(&slot->crit_sect);
1778
1779         /* unconfigure all functions */
1780         retval = disable_device(slot);
1781         if (retval)
1782                 goto err_exit;
1783
1784         /* power off all functions */
1785         retval = power_off_slot(slot);
1786         if (retval)
1787                 goto err_exit;
1788
1789  err_exit:
1790         mutex_unlock(&slot->crit_sect);
1791         return retval;
1792 }
1793
1794
1795 /*
1796  * slot enabled:  1
1797  * slot disabled: 0
1798  */
1799 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1800 {
1801         return (slot->flags & SLOT_POWEREDON);
1802 }
1803
1804
1805 /*
1806  * latch   open:  1
1807  * latch closed:  0
1808  */
1809 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1810 {
1811         unsigned int sta;
1812
1813         sta = get_slot_status(slot);
1814
1815         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1816 }
1817
1818
1819 /*
1820  * adapter presence : 1
1821  *          absence : 0
1822  */
1823 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1824 {
1825         unsigned int sta;
1826
1827         sta = get_slot_status(slot);
1828
1829         return (sta == 0) ? 0 : 1;
1830 }
1831
1832
1833 /*
1834  * pci address (seg/bus/dev)
1835  */
1836 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1837 {
1838         u32 address;
1839         struct pci_bus *pci_bus = slot->bridge->pci_bus;
1840
1841         address = (pci_domain_nr(pci_bus) << 16) |
1842                   (pci_bus->number << 8) |
1843                   slot->device;
1844
1845         return address;
1846 }