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_bridge has its refcount elevated by pci_get_slot()
  36  *    when the bridge is scanned and it loses a refcount when the bridge
  37  *    is removed.
  38  *  - When a P2P bridge is present, we elevate the refcount on the subordinate
  39  *    bus. It loses the refcount when the the driver unloads.
  40  */
  41
  42 #include <linux/init.h>
  43 #include <linux/module.h>
  44
  45 #include <linux/kernel.h>
  46 #include <linux/pci.h>
  47 #include <linux/pci_hotplug.h>
  48 #include <linux/pci-acpi.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 /* callback routine to check for the existence of a pci dock device */
  66 static acpi_status
  67 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
  68 {
  69         int *count = (int *)context;
  70
  71         if (is_dock_device(handle)) {
  72                 (*count)++;
  73                 return AE_CTRL_TERMINATE;
  74         } else {
  75                 return AE_OK;
  76         }
  77 }
  78
  79 /*
  80  * the _DCK method can do funny things... and sometimes not
  81  * hah-hah funny.
  82  *
  83  * TBD - figure out a way to only call fixups for
  84  * systems that require them.
  85  */
  86 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
  87         void *v)
  88 {
  89         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
  90         struct pci_bus *bus = func->slot->bridge->pci_bus;
  91         u32 buses;
  92
  93         if (!bus->self)
  94                 return  NOTIFY_OK;
  95
  96         /* fixup bad _DCK function that rewrites
  97          * secondary bridge on slot
  98          */
  99         pci_read_config_dword(bus->self,
 100                         PCI_PRIMARY_BUS,
 101                         &buses);
 102
 103         if (((buses >> 8) & 0xff) != bus->secondary) {
 104                 buses = (buses & 0xff000000)
 105                         | ((unsigned int)(bus->primary)     <<  0)
 106                         | ((unsigned int)(bus->secondary)   <<  8)
 107                         | ((unsigned int)(bus->subordinate) << 16);
 108                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
 109         }
 110         return NOTIFY_OK;
 111 }
 112
 113
 114 static struct acpi_dock_ops acpiphp_dock_ops = {
 115         .handler = handle_hotplug_event_func,
 116 };
 117
 118 /* callback routine to register each ACPI PCI slot object */
 119 static acpi_status
 120 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 121 {
 122         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 123         struct acpiphp_slot *slot;
 124         struct acpiphp_func *newfunc;
 125         acpi_handle tmp;
 126         acpi_status status = AE_OK;
 127         unsigned long long adr, sun;
 128         int device, function, retval;
 129         struct pci_bus *pbus = bridge->pci_bus;
 130         struct pci_dev *pdev;
 131
 132         if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
 133                 return AE_OK;
 134
 135         acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 136         device = (adr >> 16) & 0xffff;
 137         function = adr & 0xffff;
 138
 139         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 140         if (!newfunc)
 141                 return AE_NO_MEMORY;
 142
 143         INIT_LIST_HEAD(&newfunc->sibling);
 144         newfunc->handle = handle;
 145         newfunc->function = function;
 146
 147         if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
 148                 newfunc->flags = FUNC_HAS_EJ0;
 149
 150         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 151                 newfunc->flags |= FUNC_HAS_STA;
 152
 153         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 154                 newfunc->flags |= FUNC_HAS_PS0;
 155
 156         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 157                 newfunc->flags |= FUNC_HAS_PS3;
 158
 159         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 160                 newfunc->flags |= FUNC_HAS_DCK;
 161
 162         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 163         if (ACPI_FAILURE(status)) {
 164                 /*
 165                  * use the count of the number of slots we've found
 166                  * for the number of the slot
 167                  */
 168                 sun = bridge->nr_slots+1;
 169         }
 170
 171         /* search for objects that share the same slot */
 172         for (slot = bridge->slots; slot; slot = slot->next)
 173                 if (slot->device == device) {
 174                         if (slot->sun != sun)
 175                                 warn("sibling found, but _SUN doesn't match!\n");
 176                         break;
 177                 }
 178
 179         if (!slot) {
 180                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 181                 if (!slot) {
 182                         kfree(newfunc);
 183                         return AE_NO_MEMORY;
 184                 }
 185
 186                 slot->bridge = bridge;
 187                 slot->device = device;
 188                 slot->sun = sun;
 189                 INIT_LIST_HEAD(&slot->funcs);
 190                 mutex_init(&slot->crit_sect);
 191
 192                 slot->next = bridge->slots;
 193                 bridge->slots = slot;
 194
 195                 bridge->nr_slots++;
 196
 197                 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
 198                     slot->sun, pci_domain_nr(pbus), pbus->number, device);
 199                 retval = acpiphp_register_hotplug_slot(slot);
 200                 if (retval) {
 201                         if (retval == -EBUSY)
 202                                 warn("Slot %llu already registered by another "
 203                                         "hotplug driver\n", slot->sun);
 204                         else
 205                                 warn("acpiphp_register_hotplug_slot failed "
 206                                         "(err code = 0x%x)\n", retval);
 207                         goto err_exit;
 208                 }
 209         }
 210
 211         newfunc->slot = slot;
 212         list_add_tail(&newfunc->sibling, &slot->funcs);
 213
 214         pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
 215         if (pdev) {
 216                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 217                 pci_dev_put(pdev);
 218         }
 219
 220         if (is_dock_device(handle)) {
 221                 /* we don't want to call this device's _EJ0
 222                  * because we want the dock notify handler
 223                  * to call it after it calls _DCK
 224                  */
 225                 newfunc->flags &= ~FUNC_HAS_EJ0;
 226                 if (register_hotplug_dock_device(handle,
 227                         &acpiphp_dock_ops, newfunc))
 228                         dbg("failed to register dock device\n");
 229
 230                 /* we need to be notified when dock events happen
 231                  * outside of the hotplug operation, since we may
 232                  * need to do fixups before we can hotplug.
 233                  */
 234                 newfunc->nb.notifier_call = post_dock_fixups;
 235                 if (register_dock_notifier(&newfunc->nb))
 236                         dbg("failed to register a dock notifier");
 237         }
 238
 239         /* install notify handler */
 240         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 241                 status = acpi_install_notify_handler(handle,
 242                                              ACPI_SYSTEM_NOTIFY,
 243                                              handle_hotplug_event_func,
 244                                              newfunc);
 245
 246                 if (ACPI_FAILURE(status))
 247                         err("failed to register interrupt notify handler\n");
 248         } else
 249                 status = AE_OK;
 250
 251         return status;
 252
 253  err_exit:
 254         bridge->nr_slots--;
 255         bridge->slots = slot->next;
 256         kfree(slot);
 257         kfree(newfunc);
 258
 259         return AE_OK;
 260 }
 261
 262
 263 /* see if it's worth looking at this bridge */
 264 static int detect_ejectable_slots(struct pci_bus *pbus)
 265 {
 266         int found = acpi_pci_detect_ejectable(pbus);
 267         if (!found) {
 268                 acpi_handle bridge_handle = acpi_pci_get_bridge_handle(pbus);
 269                 if (!bridge_handle)
 270                         return 0;
 271                 acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 272                                     is_pci_dock_device, (void *)&found, NULL);
 273         }
 274         return found;
 275 }
 276
 277
 278 /* decode ACPI 2.0 _HPP hot plug parameters */
 279 static void decode_hpp(struct acpiphp_bridge *bridge)
 280 {
 281         acpi_status status;
 282
 283         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 284         if (ACPI_FAILURE(status) ||
 285             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 286                 /* use default numbers */
 287                 printk(KERN_WARNING
 288                        "%s: Could not get hotplug parameters. Use defaults\n",
 289                        __func__);
 290                 bridge->hpp.t0 = &bridge->hpp.type0_data;
 291                 bridge->hpp.t0->revision = 0;
 292                 bridge->hpp.t0->cache_line_size = 0x10;
 293                 bridge->hpp.t0->latency_timer = 0x40;
 294                 bridge->hpp.t0->enable_serr = 0;
 295                 bridge->hpp.t0->enable_perr = 0;
 296         }
 297 }
 298
 299
 300
 301 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 302 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 303 {
 304         acpi_status status;
 305
 306         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 307         decode_hpp(bridge);
 308
 309         /* must be added to the list prior to calling register_slot */
 310         list_add(&bridge->list, &bridge_list);
 311
 312         /* register all slot objects under this bridge */
 313         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 314                                      register_slot, bridge, NULL);
 315         if (ACPI_FAILURE(status)) {
 316                 list_del(&bridge->list);
 317                 return;
 318         }
 319
 320         /* install notify handler */
 321         if (bridge->type != BRIDGE_TYPE_HOST) {
 322                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 323                         status = acpi_remove_notify_handler(bridge->func->handle,
 324                                                 ACPI_SYSTEM_NOTIFY,
 325                                                 handle_hotplug_event_func);
 326                         if (ACPI_FAILURE(status))
 327                                 err("failed to remove notify handler\n");
 328                 }
 329                 status = acpi_install_notify_handler(bridge->handle,
 330                                              ACPI_SYSTEM_NOTIFY,
 331                                              handle_hotplug_event_bridge,
 332                                              bridge);
 333
 334                 if (ACPI_FAILURE(status)) {
 335                         err("failed to register interrupt notify handler\n");
 336                 }
 337         }
 338 }
 339
 340
 341 /* find acpiphp_func from acpiphp_bridge */
 342 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 343 {
 344         struct list_head *node, *l;
 345         struct acpiphp_bridge *bridge;
 346         struct acpiphp_slot *slot;
 347         struct acpiphp_func *func;
 348
 349         list_for_each(node, &bridge_list) {
 350                 bridge = list_entry(node, struct acpiphp_bridge, list);
 351                 for (slot = bridge->slots; slot; slot = slot->next) {
 352                         list_for_each(l, &slot->funcs) {
 353                                 func = list_entry(l, struct acpiphp_func,
 354                                                         sibling);
 355                                 if (func->handle == handle)
 356                                         return func;
 357                         }
 358                 }
 359         }
 360
 361         return NULL;
 362 }
 363
 364
 365 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 366 {
 367         acpi_handle dummy_handle;
 368
 369         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 370                                         "_STA", &dummy_handle)))
 371                 bridge->flags |= BRIDGE_HAS_STA;
 372
 373         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 374                                         "_EJ0", &dummy_handle)))
 375                 bridge->flags |= BRIDGE_HAS_EJ0;
 376
 377         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 378                                         "_PS0", &dummy_handle)))
 379                 bridge->flags |= BRIDGE_HAS_PS0;
 380
 381         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 382                                         "_PS3", &dummy_handle)))
 383                 bridge->flags |= BRIDGE_HAS_PS3;
 384
 385         /* is this ejectable p2p bridge? */
 386         if (bridge->flags & BRIDGE_HAS_EJ0) {
 387                 struct acpiphp_func *func;
 388
 389                 dbg("found ejectable p2p bridge\n");
 390
 391                 /* make link between PCI bridge and PCI function */
 392                 func = acpiphp_bridge_handle_to_function(bridge->handle);
 393                 if (!func)
 394                         return;
 395                 bridge->func = func;
 396                 func->bridge = bridge;
 397         }
 398 }
 399
 400
 401 /* allocate and initialize host bridge data structure */
 402 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 403 {
 404         struct acpiphp_bridge *bridge;
 405
 406         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 407         if (bridge == NULL)
 408                 return;
 409
 410         bridge->type = BRIDGE_TYPE_HOST;
 411         bridge->handle = handle;
 412
 413         bridge->pci_bus = pci_bus;
 414
 415         spin_lock_init(&bridge->res_lock);
 416
 417         init_bridge_misc(bridge);
 418 }
 419
 420
 421 /* allocate and initialize PCI-to-PCI bridge data structure */
 422 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 423 {
 424         struct acpiphp_bridge *bridge;
 425
 426         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 427         if (bridge == NULL) {
 428                 err("out of memory\n");
 429                 return;
 430         }
 431
 432         bridge->type = BRIDGE_TYPE_P2P;
 433         bridge->handle = handle;
 434         config_p2p_bridge_flags(bridge);
 435
 436         bridge->pci_dev = pci_dev_get(pci_dev);
 437         bridge->pci_bus = pci_dev->subordinate;
 438         if (!bridge->pci_bus) {
 439                 err("This is not a PCI-to-PCI bridge!\n");
 440                 goto err;
 441         }
 442
 443         /*
 444          * Grab a ref to the subordinate PCI bus in case the bus is
 445          * removed via PCI core logical hotplug. The ref pins the bus
 446          * (which we access during module unload).
 447          */
 448         get_device(&bridge->pci_bus->dev);
 449         spin_lock_init(&bridge->res_lock);
 450
 451         init_bridge_misc(bridge);
 452         return;
 453  err:
 454         pci_dev_put(pci_dev);
 455         kfree(bridge);
 456         return;
 457 }
 458
 459
 460 /* callback routine to find P2P bridges */
 461 static acpi_status
 462 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 463 {
 464         acpi_status status;
 465         acpi_handle dummy_handle;
 466         unsigned long long tmp;
 467         int device, function;
 468         struct pci_dev *dev;
 469         struct pci_bus *pci_bus = context;
 470
 471         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 472         if (ACPI_FAILURE(status))
 473                 return AE_OK;           /* continue */
 474
 475         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 476         if (ACPI_FAILURE(status)) {
 477                 dbg("%s: _ADR evaluation failure\n", __func__);
 478                 return AE_OK;
 479         }
 480
 481         device = (tmp >> 16) & 0xffff;
 482         function = tmp & 0xffff;
 483
 484         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 485
 486         if (!dev || !dev->subordinate)
 487                 goto out;
 488
 489         /* check if this bridge has ejectable slots */
 490         if ((detect_ejectable_slots(dev->subordinate) > 0)) {
 491                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 492                 add_p2p_bridge(handle, dev);
 493         }
 494
 495         /* search P2P bridges under this p2p bridge */
 496         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 497                                      find_p2p_bridge, dev->subordinate, NULL);
 498         if (ACPI_FAILURE(status))
 499                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 500
 501  out:
 502         pci_dev_put(dev);
 503         return AE_OK;
 504 }
 505
 506
 507 /* find hot-pluggable slots, and then find P2P bridge */
 508 static int add_bridge(acpi_handle handle)
 509 {
 510         acpi_status status;
 511         unsigned long long tmp;
 512         int seg, bus;
 513         acpi_handle dummy_handle;
 514         struct pci_bus *pci_bus;
 515
 516         /* if the bridge doesn't have _STA, we assume it is always there */
 517         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 518         if (ACPI_SUCCESS(status)) {
 519                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 520                 if (ACPI_FAILURE(status)) {
 521                         dbg("%s: _STA evaluation failure\n", __func__);
 522                         return 0;
 523                 }
 524                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 525                         /* don't register this object */
 526                         return 0;
 527         }
 528
 529         /* get PCI segment number */
 530         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 531
 532         seg = ACPI_SUCCESS(status) ? tmp : 0;
 533
 534         /* get PCI bus number */
 535         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 536
 537         if (ACPI_SUCCESS(status)) {
 538                 bus = tmp;
 539         } else {
 540                 warn("can't get bus number, assuming 0\n");
 541                 bus = 0;
 542         }
 543
 544         pci_bus = pci_find_bus(seg, bus);
 545         if (!pci_bus) {
 546                 err("Can't find bus %04x:%02x\n", seg, bus);
 547                 return 0;
 548         }
 549
 550         /* check if this bridge has ejectable slots */
 551         if (detect_ejectable_slots(pci_bus) > 0) {
 552                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 553                 add_host_bridge(handle, pci_bus);
 554         }
 555
 556         /* search P2P bridges under this host bridge */
 557         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 558                                      find_p2p_bridge, pci_bus, NULL);
 559
 560         if (ACPI_FAILURE(status))
 561                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 562
 563         return 0;
 564 }
 565
 566 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 567 {
 568         struct list_head *head;
 569         list_for_each(head, &bridge_list) {
 570                 struct acpiphp_bridge *bridge = list_entry(head,
 571                                                 struct acpiphp_bridge, list);
 572                 if (bridge->handle == handle)
 573                         return bridge;
 574         }
 575
 576         return NULL;
 577 }
 578
 579 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 580 {
 581         struct list_head *list, *tmp;
 582         struct acpiphp_slot *slot;
 583         acpi_status status;
 584         acpi_handle handle = bridge->handle;
 585
 586         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 587                                             handle_hotplug_event_bridge);
 588         if (ACPI_FAILURE(status))
 589                 err("failed to remove notify handler\n");
 590
 591         if ((bridge->type != BRIDGE_TYPE_HOST) &&
 592             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
 593                 status = acpi_install_notify_handler(bridge->func->handle,
 594                                                 ACPI_SYSTEM_NOTIFY,
 595                                                 handle_hotplug_event_func,
 596                                                 bridge->func);
 597                 if (ACPI_FAILURE(status))
 598                         err("failed to install interrupt notify handler\n");
 599         }
 600
 601         slot = bridge->slots;
 602         while (slot) {
 603                 struct acpiphp_slot *next = slot->next;
 604                 list_for_each_safe (list, tmp, &slot->funcs) {
 605                         struct acpiphp_func *func;
 606                         func = list_entry(list, struct acpiphp_func, sibling);
 607                         if (is_dock_device(func->handle)) {
 608                                 unregister_hotplug_dock_device(func->handle);
 609                                 unregister_dock_notifier(&func->nb);
 610                         }
 611                         if (!(func->flags & FUNC_HAS_DCK)) {
 612                                 status = acpi_remove_notify_handler(func->handle,
 613                                                 ACPI_SYSTEM_NOTIFY,
 614                                                 handle_hotplug_event_func);
 615                                 if (ACPI_FAILURE(status))
 616                                         err("failed to remove notify handler\n");
 617                         }
 618                         list_del(list);
 619                         kfree(func);
 620                 }
 621                 acpiphp_unregister_hotplug_slot(slot);
 622                 list_del(&slot->funcs);
 623                 kfree(slot);
 624                 slot = next;
 625         }
 626
 627         /*
 628          * Only P2P bridges have a pci_dev
 629          */
 630         if (bridge->pci_dev)
 631                 put_device(&bridge->pci_bus->dev);
 632
 633         pci_dev_put(bridge->pci_dev);
 634         list_del(&bridge->list);
 635         kfree(bridge);
 636 }
 637
 638 static acpi_status
 639 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 640 {
 641         struct acpiphp_bridge *bridge;
 642
 643         /* cleanup p2p bridges under this P2P bridge
 644            in a depth-first manner */
 645         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 646                                 cleanup_p2p_bridge, NULL, NULL);
 647
 648         bridge = acpiphp_handle_to_bridge(handle);
 649         if (bridge)
 650                 cleanup_bridge(bridge);
 651
 652         return AE_OK;
 653 }
 654
 655 static void remove_bridge(acpi_handle handle)
 656 {
 657         struct acpiphp_bridge *bridge;
 658
 659         /* cleanup p2p bridges under this host bridge
 660            in a depth-first manner */
 661         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 662                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 663
 664         /*
 665          * On root bridges with hotplug slots directly underneath (ie,
 666          * no p2p bridge inbetween), we call cleanup_bridge().
 667          *
 668          * The else clause cleans up root bridges that either had no
 669          * hotplug slots at all, or had a p2p bridge underneath.
 670          */
 671         bridge = acpiphp_handle_to_bridge(handle);
 672         if (bridge)
 673                 cleanup_bridge(bridge);
 674         else
 675                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 676                                            handle_hotplug_event_bridge);
 677 }
 678
 679 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 680 {
 681         struct pci_dev *dev;
 682
 683         dev = acpi_get_pci_dev(handle);
 684         if (!dev)
 685                 return NULL;
 686
 687         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 688             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 689         {
 690                 pci_dev_put(dev);
 691                 return NULL;
 692         }
 693
 694         return dev;
 695 }
 696
 697 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 698 {
 699         acpi_status status;
 700         int result = -1;
 701         unsigned long long gsb;
 702         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 703         union acpi_object *obj;
 704         void *table;
 705
 706         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 707         if (ACPI_SUCCESS(status)) {
 708                 *gsi_base = (u32)gsb;
 709                 return 0;
 710         }
 711
 712         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 713         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 714                 return -1;
 715
 716         obj = buffer.pointer;
 717         if (obj->type != ACPI_TYPE_BUFFER)
 718                 goto out;
 719
 720         table = obj->buffer.pointer;
 721         switch (((struct acpi_subtable_header *)table)->type) {
 722         case ACPI_MADT_TYPE_IO_SAPIC:
 723                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
 724                 result = 0;
 725                 break;
 726         case ACPI_MADT_TYPE_IO_APIC:
 727                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
 728                 result = 0;
 729                 break;
 730         default:
 731                 break;
 732         }
 733  out:
 734         kfree(buffer.pointer);
 735         return result;
 736 }
 737
 738 static acpi_status
 739 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 740 {
 741         acpi_status status;
 742         unsigned long long sta;
 743         acpi_handle tmp;
 744         struct pci_dev *pdev;
 745         u32 gsi_base;
 746         u64 phys_addr;
 747         struct acpiphp_ioapic *ioapic;
 748
 749         /* Evaluate _STA if present */
 750         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 751         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 752                 return AE_CTRL_DEPTH;
 753
 754         /* Scan only PCI bus scope */
 755         status = acpi_get_handle(handle, "_HID", &tmp);
 756         if (ACPI_SUCCESS(status))
 757                 return AE_CTRL_DEPTH;
 758
 759         if (get_gsi_base(handle, &gsi_base))
 760                 return AE_OK;
 761
 762         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 763         if (!ioapic)
 764                 return AE_NO_MEMORY;
 765
 766         pdev = get_apic_pci_info(handle);
 767         if (!pdev)
 768                 goto exit_kfree;
 769
 770         if (pci_enable_device(pdev))
 771                 goto exit_pci_dev_put;
 772
 773         pci_set_master(pdev);
 774
 775         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 776                 goto exit_pci_disable_device;
 777
 778         phys_addr = pci_resource_start(pdev, 0);
 779         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 780                 goto exit_pci_release_region;
 781
 782         ioapic->gsi_base = gsi_base;
 783         ioapic->dev = pdev;
 784         spin_lock(&ioapic_list_lock);
 785         list_add_tail(&ioapic->list, &ioapic_list);
 786         spin_unlock(&ioapic_list_lock);
 787
 788         return AE_OK;
 789
 790  exit_pci_release_region:
 791         pci_release_region(pdev, 0);
 792  exit_pci_disable_device:
 793         pci_disable_device(pdev);
 794  exit_pci_dev_put:
 795         pci_dev_put(pdev);
 796  exit_kfree:
 797         kfree(ioapic);
 798
 799         return AE_OK;
 800 }
 801
 802 static acpi_status
 803 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 804 {
 805         acpi_status status;
 806         unsigned long long sta;
 807         acpi_handle tmp;
 808         u32 gsi_base;
 809         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 810
 811         /* Evaluate _STA if present */
 812         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 813         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 814                 return AE_CTRL_DEPTH;
 815
 816         /* Scan only PCI bus scope */
 817         status = acpi_get_handle(handle, "_HID", &tmp);
 818         if (ACPI_SUCCESS(status))
 819                 return AE_CTRL_DEPTH;
 820
 821         if (get_gsi_base(handle, &gsi_base))
 822                 return AE_OK;
 823
 824         acpi_unregister_ioapic(handle, gsi_base);
 825
 826         spin_lock(&ioapic_list_lock);
 827         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 828                 if (pos->gsi_base != gsi_base)
 829                         continue;
 830                 ioapic = pos;
 831                 list_del(&ioapic->list);
 832                 break;
 833         }
 834         spin_unlock(&ioapic_list_lock);
 835
 836         if (!ioapic)
 837                 return AE_OK;
 838
 839         pci_release_region(ioapic->dev, 0);
 840         pci_disable_device(ioapic->dev);
 841         pci_dev_put(ioapic->dev);
 842         kfree(ioapic);
 843
 844         return AE_OK;
 845 }
 846
 847 static int acpiphp_configure_ioapics(acpi_handle handle)
 848 {
 849         ioapic_add(handle, 0, NULL, NULL);
 850         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 851                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 852         return 0;
 853 }
 854
 855 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 856 {
 857         ioapic_remove(handle, 0, NULL, NULL);
 858         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 859                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 860         return 0;
 861 }
 862
 863 static int power_on_slot(struct acpiphp_slot *slot)
 864 {
 865         acpi_status status;
 866         struct acpiphp_func *func;
 867         struct list_head *l;
 868         int retval = 0;
 869
 870         /* if already enabled, just skip */
 871         if (slot->flags & SLOT_POWEREDON)
 872                 goto err_exit;
 873
 874         list_for_each (l, &slot->funcs) {
 875                 func = list_entry(l, struct acpiphp_func, sibling);
 876
 877                 if (func->flags & FUNC_HAS_PS0) {
 878                         dbg("%s: executing _PS0\n", __func__);
 879                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 880                         if (ACPI_FAILURE(status)) {
 881                                 warn("%s: _PS0 failed\n", __func__);
 882                                 retval = -1;
 883                                 goto err_exit;
 884                         } else
 885                                 break;
 886                 }
 887         }
 888
 889         /* TBD: evaluate _STA to check if the slot is enabled */
 890
 891         slot->flags |= SLOT_POWEREDON;
 892
 893  err_exit:
 894         return retval;
 895 }
 896
 897
 898 static int power_off_slot(struct acpiphp_slot *slot)
 899 {
 900         acpi_status status;
 901         struct acpiphp_func *func;
 902         struct list_head *l;
 903
 904         int retval = 0;
 905
 906         /* if already disabled, just skip */
 907         if ((slot->flags & SLOT_POWEREDON) == 0)
 908                 goto err_exit;
 909
 910         list_for_each (l, &slot->funcs) {
 911                 func = list_entry(l, struct acpiphp_func, sibling);
 912
 913                 if (func->flags & FUNC_HAS_PS3) {
 914                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 915                         if (ACPI_FAILURE(status)) {
 916                                 warn("%s: _PS3 failed\n", __func__);
 917                                 retval = -1;
 918                                 goto err_exit;
 919                         } else
 920                                 break;
 921                 }
 922         }
 923
 924         /* TBD: evaluate _STA to check if the slot is disabled */
 925
 926         slot->flags &= (~SLOT_POWEREDON);
 927
 928  err_exit:
 929         return retval;
 930 }
 931
 932
 933
 934 /**
 935  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
 936  * @bus: bus to start search with
 937  */
 938 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
 939 {
 940         struct list_head *tmp;
 941         unsigned char max, n;
 942
 943         /*
 944          * pci_bus_max_busnr will return the highest
 945          * reserved busnr for all these children.
 946          * that is equivalent to the bus->subordinate
 947          * value.  We don't want to use the parent's
 948          * bus->subordinate value because it could have
 949          * padding in it.
 950          */
 951         max = bus->secondary;
 952
 953         list_for_each(tmp, &bus->children) {
 954                 n = pci_bus_max_busnr(pci_bus_b(tmp));
 955                 if (n > max)
 956                         max = n;
 957         }
 958         return max;
 959 }
 960
 961
 962 /**
 963  * acpiphp_bus_add - add a new bus to acpi subsystem
 964  * @func: acpiphp_func of the bridge
 965  */
 966 static int acpiphp_bus_add(struct acpiphp_func *func)
 967 {
 968         acpi_handle phandle;
 969         struct acpi_device *device, *pdevice;
 970         int ret_val;
 971
 972         acpi_get_parent(func->handle, &phandle);
 973         if (acpi_bus_get_device(phandle, &pdevice)) {
 974                 dbg("no parent device, assuming NULL\n");
 975                 pdevice = NULL;
 976         }
 977         if (!acpi_bus_get_device(func->handle, &device)) {
 978                 dbg("bus exists... trim\n");
 979                 /* this shouldn't be in here, so remove
 980                  * the bus then re-add it...
 981                  */
 982                 ret_val = acpi_bus_trim(device, 1);
 983                 dbg("acpi_bus_trim return %x\n", ret_val);
 984         }
 985
 986         ret_val = acpi_bus_add(&device, pdevice, func->handle,
 987                 ACPI_BUS_TYPE_DEVICE);
 988         if (ret_val) {
 989                 dbg("error adding bus, %x\n",
 990                         -ret_val);
 991                 goto acpiphp_bus_add_out;
 992         }
 993         /*
 994          * try to start anyway.  We could have failed to add
 995          * simply because this bus had previously been added
 996          * on another add.  Don't bother with the return value
 997          * we just keep going.
 998          */
 999         ret_val = acpi_bus_start(device);
1000
1001 acpiphp_bus_add_out:
1002         return ret_val;
1003 }
1004
1005
1006 /**
1007  * acpiphp_bus_trim - trim a bus from acpi subsystem
1008  * @handle: handle to acpi namespace
1009  */
1010 static int acpiphp_bus_trim(acpi_handle handle)
1011 {
1012         struct acpi_device *device;
1013         int retval;
1014
1015         retval = acpi_bus_get_device(handle, &device);
1016         if (retval) {
1017                 dbg("acpi_device not found\n");
1018                 return retval;
1019         }
1020
1021         retval = acpi_bus_trim(device, 1);
1022         if (retval)
1023                 err("cannot remove from acpi list\n");
1024
1025         return retval;
1026 }
1027
1028 /**
1029  * enable_device - enable, configure a slot
1030  * @slot: slot to be enabled
1031  *
1032  * This function should be called per *physical slot*,
1033  * not per each slot object in ACPI namespace.
1034  */
1035 static int __ref enable_device(struct acpiphp_slot *slot)
1036 {
1037         struct pci_dev *dev;
1038         struct pci_bus *bus = slot->bridge->pci_bus;
1039         struct list_head *l;
1040         struct acpiphp_func *func;
1041         int retval = 0;
1042         int num, max, pass;
1043         acpi_status status;
1044
1045         if (slot->flags & SLOT_ENABLED)
1046                 goto err_exit;
1047
1048         /* sanity check: dev should be NULL when hot-plugged in */
1049         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1050         if (dev) {
1051                 /* This case shouldn't happen */
1052                 err("pci_dev structure already exists.\n");
1053                 pci_dev_put(dev);
1054                 retval = -1;
1055                 goto err_exit;
1056         }
1057
1058         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1059         if (num == 0) {
1060                 err("No new device found\n");
1061                 retval = -1;
1062                 goto err_exit;
1063         }
1064
1065         max = acpiphp_max_busnr(bus);
1066         for (pass = 0; pass < 2; pass++) {
1067                 list_for_each_entry(dev, &bus->devices, bus_list) {
1068                         if (PCI_SLOT(dev->devfn) != slot->device)
1069                                 continue;
1070                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1071                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1072                                 max = pci_scan_bridge(bus, dev, max, pass);
1073                                 if (pass && dev->subordinate)
1074                                         pci_bus_size_bridges(dev->subordinate);
1075                         }
1076                 }
1077         }
1078
1079         list_for_each (l, &slot->funcs) {
1080                 func = list_entry(l, struct acpiphp_func, sibling);
1081                 acpiphp_bus_add(func);
1082         }
1083
1084         pci_bus_assign_resources(bus);
1085         acpiphp_sanitize_bus(bus);
1086         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1087         list_for_each_entry(func, &slot->funcs, sibling)
1088                 acpiphp_configure_ioapics(func->handle);
1089         pci_enable_bridges(bus);
1090         pci_bus_add_devices(bus);
1091
1092         list_for_each (l, &slot->funcs) {
1093                 func = list_entry(l, struct acpiphp_func, sibling);
1094                 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1095                                                   func->function));
1096                 if (!dev)
1097                         continue;
1098
1099                 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1100                     dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
1101                         pci_dev_put(dev);
1102                         continue;
1103                 }
1104
1105                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1106                 if (ACPI_FAILURE(status))
1107                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1108                                 status);
1109                 pci_dev_put(dev);
1110         }
1111
1112         slot->flags |= SLOT_ENABLED;
1113
1114  err_exit:
1115         return retval;
1116 }
1117
1118 static void disable_bridges(struct pci_bus *bus)
1119 {
1120         struct pci_dev *dev;
1121         list_for_each_entry(dev, &bus->devices, bus_list) {
1122                 if (dev->subordinate) {
1123                         disable_bridges(dev->subordinate);
1124                         pci_disable_device(dev);
1125                 }
1126         }
1127 }
1128
1129 /**
1130  * disable_device - disable a slot
1131  * @slot: ACPI PHP slot
1132  */
1133 static int disable_device(struct acpiphp_slot *slot)
1134 {
1135         struct acpiphp_func *func;
1136         struct pci_dev *pdev;
1137
1138         /* is this slot already disabled? */
1139         if (!(slot->flags & SLOT_ENABLED))
1140                 goto err_exit;
1141
1142         list_for_each_entry(func, &slot->funcs, sibling) {
1143                 if (func->bridge) {
1144                         /* cleanup p2p bridges under this P2P bridge */
1145                         cleanup_p2p_bridge(func->bridge->handle,
1146                                                 (u32)1, NULL, NULL);
1147                         func->bridge = NULL;
1148                 }
1149
1150                 pdev = pci_get_slot(slot->bridge->pci_bus,
1151                                     PCI_DEVFN(slot->device, func->function));
1152                 if (pdev) {
1153                         pci_stop_bus_device(pdev);
1154                         if (pdev->subordinate) {
1155                                 disable_bridges(pdev->subordinate);
1156                                 pci_disable_device(pdev);
1157                         }
1158                         pci_remove_bus_device(pdev);
1159                         pci_dev_put(pdev);
1160                 }
1161         }
1162
1163         list_for_each_entry(func, &slot->funcs, sibling) {
1164                 acpiphp_unconfigure_ioapics(func->handle);
1165                 acpiphp_bus_trim(func->handle);
1166         }
1167
1168         slot->flags &= (~SLOT_ENABLED);
1169
1170 err_exit:
1171         return 0;
1172 }
1173
1174
1175 /**
1176  * get_slot_status - get ACPI slot status
1177  * @slot: ACPI PHP slot
1178  *
1179  * If a slot has _STA for each function and if any one of them
1180  * returned non-zero status, return it.
1181  *
1182  * If a slot doesn't have _STA and if any one of its functions'
1183  * configuration space is configured, return 0x0f as a _STA.
1184  *
1185  * Otherwise return 0.
1186  */
1187 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1188 {
1189         acpi_status status;
1190         unsigned long long sta = 0;
1191         u32 dvid;
1192         struct list_head *l;
1193         struct acpiphp_func *func;
1194
1195         list_for_each (l, &slot->funcs) {
1196                 func = list_entry(l, struct acpiphp_func, sibling);
1197
1198                 if (func->flags & FUNC_HAS_STA) {
1199                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1200                         if (ACPI_SUCCESS(status) && sta)
1201                                 break;
1202                 } else {
1203                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1204                                                   PCI_DEVFN(slot->device,
1205                                                             func->function),
1206                                                   PCI_VENDOR_ID, &dvid);
1207                         if (dvid != 0xffffffff) {
1208                                 sta = ACPI_STA_ALL;
1209                                 break;
1210                         }
1211                 }
1212         }
1213
1214         return (unsigned int)sta;
1215 }
1216
1217 /**
1218  * acpiphp_eject_slot - physically eject the slot
1219  * @slot: ACPI PHP slot
1220  */
1221 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1222 {
1223         acpi_status status;
1224         struct acpiphp_func *func;
1225         struct list_head *l;
1226         struct acpi_object_list arg_list;
1227         union acpi_object arg;
1228
1229         list_for_each (l, &slot->funcs) {
1230                 func = list_entry(l, struct acpiphp_func, sibling);
1231
1232                 /* We don't want to call _EJ0 on non-existing functions. */
1233                 if ((func->flags & FUNC_HAS_EJ0)) {
1234                         /* _EJ0 method take one argument */
1235                         arg_list.count = 1;
1236                         arg_list.pointer = &arg;
1237                         arg.type = ACPI_TYPE_INTEGER;
1238                         arg.integer.value = 1;
1239
1240                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1241                         if (ACPI_FAILURE(status)) {
1242                                 warn("%s: _EJ0 failed\n", __func__);
1243                                 return -1;
1244                         } else
1245                                 break;
1246                 }
1247         }
1248         return 0;
1249 }
1250
1251 /**
1252  * acpiphp_check_bridge - re-enumerate devices
1253  * @bridge: where to begin re-enumeration
1254  *
1255  * Iterate over all slots under this bridge and make sure that if a
1256  * card is present they are enabled, and if not they are disabled.
1257  */
1258 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1259 {
1260         struct acpiphp_slot *slot;
1261         int retval = 0;
1262         int enabled, disabled;
1263
1264         enabled = disabled = 0;
1265
1266         for (slot = bridge->slots; slot; slot = slot->next) {
1267                 unsigned int status = get_slot_status(slot);
1268                 if (slot->flags & SLOT_ENABLED) {
1269                         if (status == ACPI_STA_ALL)
1270                                 continue;
1271                         retval = acpiphp_disable_slot(slot);
1272                         if (retval) {
1273                                 err("Error occurred in disabling\n");
1274                                 goto err_exit;
1275                         } else {
1276                                 acpiphp_eject_slot(slot);
1277                         }
1278                         disabled++;
1279                 } else {
1280                         if (status != ACPI_STA_ALL)
1281                                 continue;
1282                         retval = acpiphp_enable_slot(slot);
1283                         if (retval) {
1284                                 err("Error occurred in enabling\n");
1285                                 goto err_exit;
1286                         }
1287                         enabled++;
1288                 }
1289         }
1290
1291         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1292
1293  err_exit:
1294         return retval;
1295 }
1296
1297 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1298 {
1299         u16 pci_cmd, pci_bctl;
1300         struct pci_dev *cdev;
1301
1302         /* Program hpp values for this device */
1303         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1304                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1305                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1306                 return;
1307
1308         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1309                 return;
1310
1311         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1312                         bridge->hpp.t0->cache_line_size);
1313         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1314                         bridge->hpp.t0->latency_timer);
1315         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1316         if (bridge->hpp.t0->enable_serr)
1317                 pci_cmd |= PCI_COMMAND_SERR;
1318         else
1319                 pci_cmd &= ~PCI_COMMAND_SERR;
1320         if (bridge->hpp.t0->enable_perr)
1321                 pci_cmd |= PCI_COMMAND_PARITY;
1322         else
1323                 pci_cmd &= ~PCI_COMMAND_PARITY;
1324         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1325
1326         /* Program bridge control value and child devices */
1327         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1328                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1329                                 bridge->hpp.t0->latency_timer);
1330                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1331                 if (bridge->hpp.t0->enable_serr)
1332                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1333                 else
1334                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1335                 if (bridge->hpp.t0->enable_perr)
1336                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1337                 else
1338                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1339                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1340                 if (dev->subordinate) {
1341                         list_for_each_entry(cdev, &dev->subordinate->devices,
1342                                         bus_list)
1343                                 program_hpp(cdev, bridge);
1344                 }
1345         }
1346 }
1347
1348 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1349 {
1350         struct acpiphp_bridge bridge;
1351         struct pci_dev *dev;
1352
1353         memset(&bridge, 0, sizeof(bridge));
1354         bridge.handle = handle;
1355         bridge.pci_bus = bus;
1356         bridge.pci_dev = bus->self;
1357         decode_hpp(&bridge);
1358         list_for_each_entry(dev, &bus->devices, bus_list)
1359                 program_hpp(dev, &bridge);
1360
1361 }
1362
1363 /*
1364  * Remove devices for which we could not assign resources, call
1365  * arch specific code to fix-up the bus
1366  */
1367 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1368 {
1369         struct pci_dev *dev;
1370         int i;
1371         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1372
1373         list_for_each_entry(dev, &bus->devices, bus_list) {
1374                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1375                         struct resource *res = &dev->resource[i];
1376                         if ((res->flags & type_mask) && !res->start &&
1377                                         res->end) {
1378                                 /* Could not assign a required resources
1379                                  * for this device, remove it */
1380                                 pci_remove_bus_device(dev);
1381                                 break;
1382                         }
1383                 }
1384         }
1385 }
1386
1387 /* Program resources in newly inserted bridge */
1388 static int acpiphp_configure_bridge (acpi_handle handle)
1389 {
1390         struct pci_dev *dev;
1391         struct pci_bus *bus;
1392
1393         dev = acpi_get_pci_dev(handle);
1394         if (!dev) {
1395                 err("cannot get PCI domain and bus number for bridge\n");
1396                 return -EINVAL;
1397         }
1398
1399         bus = dev->bus;
1400
1401         pci_bus_size_bridges(bus);
1402         pci_bus_assign_resources(bus);
1403         acpiphp_sanitize_bus(bus);
1404         acpiphp_set_hpp_values(handle, bus);
1405         pci_enable_bridges(bus);
1406         acpiphp_configure_ioapics(handle);
1407         pci_dev_put(dev);
1408         return 0;
1409 }
1410
1411 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1412 {
1413         struct acpi_device *device, *pdevice;
1414         acpi_handle phandle;
1415
1416         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1417                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1418                 err("unexpected notification type %d\n", type);
1419                 return;
1420         }
1421
1422         acpi_get_parent(handle, &phandle);
1423         if (acpi_bus_get_device(phandle, &pdevice)) {
1424                 dbg("no parent device, assuming NULL\n");
1425                 pdevice = NULL;
1426         }
1427         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1428                 err("cannot add bridge to acpi list\n");
1429                 return;
1430         }
1431         if (!acpiphp_configure_bridge(handle) &&
1432                 !acpi_bus_start(device))
1433                 add_bridge(handle);
1434         else
1435                 err("cannot configure and start bridge\n");
1436
1437 }
1438
1439 /*
1440  * ACPI event handlers
1441  */
1442
1443 static acpi_status
1444 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1445 {
1446         int *count = (int *)context;
1447         struct acpiphp_bridge *bridge;
1448
1449         bridge = acpiphp_handle_to_bridge(handle);
1450         if (bridge)
1451                 (*count)++;
1452         return AE_OK ;
1453 }
1454
1455 static acpi_status
1456 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1457 {
1458         struct acpiphp_bridge *bridge;
1459         char objname[64];
1460         struct acpi_buffer buffer = { .length = sizeof(objname),
1461                                       .pointer = objname };
1462
1463         bridge = acpiphp_handle_to_bridge(handle);
1464         if (bridge) {
1465                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1466                 dbg("%s: re-enumerating slots under %s\n",
1467                         __func__, objname);
1468                 acpiphp_check_bridge(bridge);
1469         }
1470         return AE_OK ;
1471 }
1472
1473 /**
1474  * handle_hotplug_event_bridge - handle ACPI event on bridges
1475  * @handle: Notify()'ed acpi_handle
1476  * @type: Notify code
1477  * @context: pointer to acpiphp_bridge structure
1478  *
1479  * Handles ACPI event notification on {host,p2p} bridges.
1480  */
1481 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1482 {
1483         struct acpiphp_bridge *bridge;
1484         char objname[64];
1485         struct acpi_buffer buffer = { .length = sizeof(objname),
1486                                       .pointer = objname };
1487         struct acpi_device *device;
1488         int num_sub_bridges = 0;
1489
1490         if (acpi_bus_get_device(handle, &device)) {
1491                 /* This bridge must have just been physically inserted */
1492                 handle_bridge_insertion(handle, type);
1493                 return;
1494         }
1495
1496         bridge = acpiphp_handle_to_bridge(handle);
1497         if (type == ACPI_NOTIFY_BUS_CHECK) {
1498                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1499                         count_sub_bridges, &num_sub_bridges, NULL);
1500         }
1501
1502         if (!bridge && !num_sub_bridges) {
1503                 err("cannot get bridge info\n");
1504                 return;
1505         }
1506
1507         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1508
1509         switch (type) {
1510         case ACPI_NOTIFY_BUS_CHECK:
1511                 /* bus re-enumerate */
1512                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1513                 if (bridge) {
1514                         dbg("%s: re-enumerating slots under %s\n",
1515                                 __func__, objname);
1516                         acpiphp_check_bridge(bridge);
1517                 }
1518                 if (num_sub_bridges)
1519                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1520                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1521                 break;
1522
1523         case ACPI_NOTIFY_DEVICE_CHECK:
1524                 /* device check */
1525                 dbg("%s: Device check notify on %s\n", __func__, objname);
1526                 acpiphp_check_bridge(bridge);
1527                 break;
1528
1529         case ACPI_NOTIFY_DEVICE_WAKE:
1530                 /* wake event */
1531                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1532                 break;
1533
1534         case ACPI_NOTIFY_EJECT_REQUEST:
1535                 /* request device eject */
1536                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1537                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1538                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1539                         struct acpiphp_slot *slot;
1540                         slot = bridge->func->slot;
1541                         if (!acpiphp_disable_slot(slot))
1542                                 acpiphp_eject_slot(slot);
1543                 }
1544                 break;
1545
1546         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1547                 printk(KERN_ERR "Device %s cannot be configured due"
1548                                 " to a frequency mismatch\n", objname);
1549                 break;
1550
1551         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1552                 printk(KERN_ERR "Device %s cannot be configured due"
1553                                 " to a bus mode mismatch\n", objname);
1554                 break;
1555
1556         case ACPI_NOTIFY_POWER_FAULT:
1557                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1558                                 objname);
1559                 break;
1560
1561         default:
1562                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1563                 break;
1564         }
1565 }
1566
1567 /**
1568  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1569  * @handle: Notify()'ed acpi_handle
1570  * @type: Notify code
1571  * @context: pointer to acpiphp_func structure
1572  *
1573  * Handles ACPI event notification on slots.
1574  */
1575 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1576 {
1577         struct acpiphp_func *func;
1578         char objname[64];
1579         struct acpi_buffer buffer = { .length = sizeof(objname),
1580                                       .pointer = objname };
1581
1582         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1583
1584         func = (struct acpiphp_func *)context;
1585
1586         switch (type) {
1587         case ACPI_NOTIFY_BUS_CHECK:
1588                 /* bus re-enumerate */
1589                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1590                 acpiphp_enable_slot(func->slot);
1591                 break;
1592
1593         case ACPI_NOTIFY_DEVICE_CHECK:
1594                 /* device check : re-enumerate from parent bus */
1595                 dbg("%s: Device check notify on %s\n", __func__, objname);
1596                 acpiphp_check_bridge(func->slot->bridge);
1597                 break;
1598
1599         case ACPI_NOTIFY_DEVICE_WAKE:
1600                 /* wake event */
1601                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1602                 break;
1603
1604         case ACPI_NOTIFY_EJECT_REQUEST:
1605                 /* request device eject */
1606                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1607                 if (!(acpiphp_disable_slot(func->slot)))
1608                         acpiphp_eject_slot(func->slot);
1609                 break;
1610
1611         default:
1612                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1613                 break;
1614         }
1615 }
1616
1617
1618 static acpi_status
1619 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1620 {
1621         int *count = (int *)context;
1622
1623         if (acpi_is_root_bridge(handle)) {
1624                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1625                                 handle_hotplug_event_bridge, NULL);
1626                         (*count)++;
1627         }
1628         return AE_OK ;
1629 }
1630
1631 static struct acpi_pci_driver acpi_pci_hp_driver = {
1632         .add =          add_bridge,
1633         .remove =       remove_bridge,
1634 };
1635
1636 /**
1637  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1638  */
1639 int __init acpiphp_glue_init(void)
1640 {
1641         int num = 0;
1642
1643         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1644                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1645
1646         if (num <= 0)
1647                 return -1;
1648         else
1649                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1650
1651         return 0;
1652 }
1653
1654
1655 /**
1656  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1657  *
1658  * This function frees all data allocated in acpiphp_glue_init().
1659  */
1660 void  acpiphp_glue_exit(void)
1661 {
1662         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1663 }
1664
1665
1666 /**
1667  * acpiphp_get_num_slots - count number of slots in a system
1668  */
1669 int __init acpiphp_get_num_slots(void)
1670 {
1671         struct acpiphp_bridge *bridge;
1672         int num_slots = 0;
1673
1674         list_for_each_entry (bridge, &bridge_list, list) {
1675                 dbg("Bus %04x:%02x has %d slot%s\n",
1676                                 pci_domain_nr(bridge->pci_bus),
1677                                 bridge->pci_bus->number, bridge->nr_slots,
1678                                 bridge->nr_slots == 1 ? "" : "s");
1679                 num_slots += bridge->nr_slots;
1680         }
1681
1682         dbg("Total %d slots\n", num_slots);
1683         return num_slots;
1684 }
1685
1686
1687 #if 0
1688 /**
1689  * acpiphp_for_each_slot - call function for each slot
1690  * @fn: callback function
1691  * @data: context to be passed to callback function
1692  */
1693 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1694 {
1695         struct list_head *node;
1696         struct acpiphp_bridge *bridge;
1697         struct acpiphp_slot *slot;
1698         int retval = 0;
1699
1700         list_for_each (node, &bridge_list) {
1701                 bridge = (struct acpiphp_bridge *)node;
1702                 for (slot = bridge->slots; slot; slot = slot->next) {
1703                         retval = fn(slot, data);
1704                         if (!retval)
1705                                 goto err_exit;
1706                 }
1707         }
1708
1709  err_exit:
1710         return retval;
1711 }
1712 #endif
1713
1714
1715 /**
1716  * acpiphp_enable_slot - power on slot
1717  * @slot: ACPI PHP slot
1718  */
1719 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1720 {
1721         int retval;
1722
1723         mutex_lock(&slot->crit_sect);
1724
1725         /* wake up all functions */
1726         retval = power_on_slot(slot);
1727         if (retval)
1728                 goto err_exit;
1729
1730         if (get_slot_status(slot) == ACPI_STA_ALL) {
1731                 /* configure all functions */
1732                 retval = enable_device(slot);
1733                 if (retval)
1734                         power_off_slot(slot);
1735         } else {
1736                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1737                 power_off_slot(slot);
1738         }
1739
1740  err_exit:
1741         mutex_unlock(&slot->crit_sect);
1742         return retval;
1743 }
1744
1745 /**
1746  * acpiphp_disable_slot - power off slot
1747  * @slot: ACPI PHP slot
1748  */
1749 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1750 {
1751         int retval = 0;
1752
1753         mutex_lock(&slot->crit_sect);
1754
1755         /* unconfigure all functions */
1756         retval = disable_device(slot);
1757         if (retval)
1758                 goto err_exit;
1759
1760         /* power off all functions */
1761         retval = power_off_slot(slot);
1762         if (retval)
1763                 goto err_exit;
1764
1765  err_exit:
1766         mutex_unlock(&slot->crit_sect);
1767         return retval;
1768 }
1769
1770
1771 /*
1772  * slot enabled:  1
1773  * slot disabled: 0
1774  */
1775 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1776 {
1777         return (slot->flags & SLOT_POWEREDON);
1778 }
1779
1780
1781 /*
1782  * latch   open:  1
1783  * latch closed:  0
1784  */
1785 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1786 {
1787         unsigned int sta;
1788
1789         sta = get_slot_status(slot);
1790
1791         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1792 }
1793
1794
1795 /*
1796  * adapter presence : 1
1797  *          absence : 0
1798  */
1799 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1800 {
1801         unsigned int sta;
1802
1803         sta = get_slot_status(slot);
1804
1805         return (sta == 0) ? 0 : 1;
1806 }