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