drivers/pci/hotplug/acpiphp_glue.c

   1 /*
   2  * ACPI PCI HotPlug glue functions to ACPI CA subsystem
   3  *
   4  * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
   5  * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
   6  * Copyright (C) 2002,2003 NEC Corporation
   7  * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
   8  * Copyright (C) 2003-2005 Hewlett Packard
   9  * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
  10  * Copyright (C) 2005 Intel Corporation
  11  *
  12  * All rights reserved.
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or (at
  17  * your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  22  * NON INFRINGEMENT.  See the GNU General Public License for more
  23  * details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  *
  29  * Send feedback to <kristen.c.accardi@intel.com>
  30  *
  31  */
  32
  33 /*
  34  * Lifetime rules for pci_dev:
  35  *  - The one in acpiphp_func has its refcount elevated by pci_get_slot()
  36  *    when the driver is loaded or when an insertion event occurs.  It loses
  37  *    a refcount when its ejected or the driver unloads.
  38  *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
  39  *    when the bridge is scanned and it loses a refcount when the bridge
  40  *    is removed.
  41  */
  42
  43 #include <linux/init.h>
  44 #include <linux/module.h>
  45
  46 #include <linux/kernel.h>
  47 #include <linux/pci.h>
  48 #include <linux/pci_hotplug.h>
  49 #include <linux/mutex.h>
  50
  51 #include "../pci.h"
  52 #include "acpiphp.h"
  53
  54 static LIST_HEAD(bridge_list);
  55 static LIST_HEAD(ioapic_list);
  56 static DEFINE_SPINLOCK(ioapic_list_lock);
  57
  58 #define MY_NAME "acpiphp_glue"
  59
  60 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
  61 static void acpiphp_sanitize_bus(struct pci_bus *bus);
  62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
  63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
  64
  65
  66 /*
  67  * initialization & terminatation routines
  68  */
  69
  70 /**
  71  * is_ejectable - determine if a slot is ejectable
  72  * @handle: handle to acpi namespace
  73  *
  74  * Ejectable slot should satisfy at least these conditions:
  75  *
  76  *  1. has _ADR method
  77  *  2. has _EJ0 method
  78  *
  79  * optionally
  80  *
  81  *  1. has _STA method
  82  *  2. has _PS0 method
  83  *  3. has _PS3 method
  84  *  4. ..
  85  */
  86 static int is_ejectable(acpi_handle handle)
  87 {
  88         acpi_status status;
  89         acpi_handle tmp;
  90
  91         status = acpi_get_handle(handle, "_ADR", &tmp);
  92         if (ACPI_FAILURE(status)) {
  93                 return 0;
  94         }
  95
  96         status = acpi_get_handle(handle, "_EJ0", &tmp);
  97         if (ACPI_FAILURE(status)) {
  98                 return 0;
  99         }
 100
 101         return 1;
 102 }
 103
 104
 105 /* callback routine to check for the existence of ejectable slots */
 106 static acpi_status
 107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 108 {
 109         int *count = (int *)context;
 110
 111         if (is_ejectable(handle)) {
 112                 (*count)++;
 113                 /* only one ejectable slot is enough */
 114                 return AE_CTRL_TERMINATE;
 115         } else {
 116                 return AE_OK;
 117         }
 118 }
 119
 120 /* callback routine to check for the existence of a pci dock device */
 121 static acpi_status
 122 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 123 {
 124         int *count = (int *)context;
 125
 126         if (is_dock_device(handle)) {
 127                 (*count)++;
 128                 return AE_CTRL_TERMINATE;
 129         } else {
 130                 return AE_OK;
 131         }
 132 }
 133
 134
 135
 136
 137 /*
 138  * the _DCK method can do funny things... and sometimes not
 139  * hah-hah funny.
 140  *
 141  * TBD - figure out a way to only call fixups for
 142  * systems that require them.
 143  */
 144 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
 145         void *v)
 146 {
 147         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
 148         struct pci_bus *bus = func->slot->bridge->pci_bus;
 149         u32 buses;
 150
 151         if (!bus->self)
 152                 return  NOTIFY_OK;
 153
 154         /* fixup bad _DCK function that rewrites
 155          * secondary bridge on slot
 156          */
 157         pci_read_config_dword(bus->self,
 158                         PCI_PRIMARY_BUS,
 159                         &buses);
 160
 161         if (((buses >> 8) & 0xff) != bus->secondary) {
 162                 buses = (buses & 0xff000000)
 163                         | ((unsigned int)(bus->primary)     <<  0)
 164                         | ((unsigned int)(bus->secondary)   <<  8)
 165                         | ((unsigned int)(bus->subordinate) << 16);
 166                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
 167         }
 168         return NOTIFY_OK;
 169 }
 170
 171
 172
 173
 174 /* callback routine to register each ACPI PCI slot object */
 175 static acpi_status
 176 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 177 {
 178         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 179         struct acpiphp_slot *slot;
 180         struct acpiphp_func *newfunc;
 181         acpi_handle tmp;
 182         acpi_status status = AE_OK;
 183         unsigned long adr, sun;
 184         int device, function, retval;
 185
 186         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 187
 188         if (ACPI_FAILURE(status))
 189                 return AE_OK;
 190
 191         status = acpi_get_handle(handle, "_EJ0", &tmp);
 192
 193         if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
 194                 return AE_OK;
 195
 196         device = (adr >> 16) & 0xffff;
 197         function = adr & 0xffff;
 198
 199         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 200         if (!newfunc)
 201                 return AE_NO_MEMORY;
 202
 203         INIT_LIST_HEAD(&newfunc->sibling);
 204         newfunc->handle = handle;
 205         newfunc->function = function;
 206         if (ACPI_SUCCESS(status))
 207                 newfunc->flags = FUNC_HAS_EJ0;
 208
 209         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 210                 newfunc->flags |= FUNC_HAS_STA;
 211
 212         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 213                 newfunc->flags |= FUNC_HAS_PS0;
 214
 215         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 216                 newfunc->flags |= FUNC_HAS_PS3;
 217
 218         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
 219                 newfunc->flags |= FUNC_HAS_DCK;
 220
 221         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 222         if (ACPI_FAILURE(status)) {
 223                 /*
 224                  * use the count of the number of slots we've found
 225                  * for the number of the slot
 226                  */
 227                 sun = bridge->nr_slots+1;
 228         }
 229
 230         /* search for objects that share the same slot */
 231         for (slot = bridge->slots; slot; slot = slot->next)
 232                 if (slot->device == device) {
 233                         if (slot->sun != sun)
 234                                 warn("sibling found, but _SUN doesn't match!\n");
 235                         break;
 236                 }
 237
 238         if (!slot) {
 239                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 240                 if (!slot) {
 241                         kfree(newfunc);
 242                         return AE_NO_MEMORY;
 243                 }
 244
 245                 slot->bridge = bridge;
 246                 slot->device = device;
 247                 slot->sun = sun;
 248                 INIT_LIST_HEAD(&slot->funcs);
 249                 mutex_init(&slot->crit_sect);
 250
 251                 slot->next = bridge->slots;
 252                 bridge->slots = slot;
 253
 254                 bridge->nr_slots++;
 255
 256                 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 257                                 slot->sun, pci_domain_nr(bridge->pci_bus),
 258                                 bridge->pci_bus->number, slot->device);
 259                 retval = acpiphp_register_hotplug_slot(slot);
 260                 if (retval) {
 261                         if (retval == -EBUSY)
 262                                 warn("Slot %d already registered by another "
 263                                         "hotplug driver\n", slot->sun);
 264                         else
 265                                 warn("acpiphp_register_hotplug_slot failed "
 266                                         "(err code = 0x%x)\n", retval);
 267                         goto err_exit;
 268                 }
 269         }
 270
 271         newfunc->slot = slot;
 272         list_add_tail(&newfunc->sibling, &slot->funcs);
 273
 274         /* associate corresponding pci_dev */
 275         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 276                                          PCI_DEVFN(device, function));
 277         if (newfunc->pci_dev) {
 278                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 279         }
 280
 281         if (is_dock_device(handle)) {
 282                 /* we don't want to call this device's _EJ0
 283                  * because we want the dock notify handler
 284                  * to call it after it calls _DCK
 285                  */
 286                 newfunc->flags &= ~FUNC_HAS_EJ0;
 287                 if (register_hotplug_dock_device(handle,
 288                         handle_hotplug_event_func, newfunc))
 289                         dbg("failed to register dock device\n");
 290
 291                 /* we need to be notified when dock events happen
 292                  * outside of the hotplug operation, since we may
 293                  * need to do fixups before we can hotplug.
 294                  */
 295                 newfunc->nb.notifier_call = post_dock_fixups;
 296                 if (register_dock_notifier(&newfunc->nb))
 297                         dbg("failed to register a dock notifier");
 298         }
 299
 300         /* install notify handler */
 301         if (!(newfunc->flags & FUNC_HAS_DCK)) {
 302                 status = acpi_install_notify_handler(handle,
 303                                              ACPI_SYSTEM_NOTIFY,
 304                                              handle_hotplug_event_func,
 305                                              newfunc);
 306
 307                 if (ACPI_FAILURE(status))
 308                         err("failed to register interrupt notify handler\n");
 309         } else
 310                 status = AE_OK;
 311
 312         return status;
 313
 314  err_exit:
 315         bridge->nr_slots--;
 316         bridge->slots = slot->next;
 317         kfree(slot);
 318         kfree(newfunc);
 319
 320         return AE_OK;
 321 }
 322
 323
 324 /* see if it's worth looking at this bridge */
 325 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 326 {
 327         acpi_status status;
 328         int count;
 329
 330         count = 0;
 331
 332         /* only check slots defined directly below bridge object */
 333         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 334                                      is_ejectable_slot, (void *)&count, NULL);
 335
 336         /*
 337          * we also need to add this bridge if there is a dock bridge or
 338          * other pci device on a dock station (removable)
 339          */
 340         if (!count)
 341                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
 342                                 (u32)1, is_pci_dock_device, (void *)&count,
 343                                 NULL);
 344
 345         return count;
 346 }
 347
 348
 349 /* decode ACPI 2.0 _HPP hot plug parameters */
 350 static void decode_hpp(struct acpiphp_bridge *bridge)
 351 {
 352         acpi_status status;
 353
 354         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
 355         if (ACPI_FAILURE(status) ||
 356             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
 357                 /* use default numbers */
 358                 printk(KERN_WARNING
 359                        "%s: Could not get hotplug parameters. Use defaults\n",
 360                        __func__);
 361                 bridge->hpp.t0 = &bridge->hpp.type0_data;
 362                 bridge->hpp.t0->revision = 0;
 363                 bridge->hpp.t0->cache_line_size = 0x10;
 364                 bridge->hpp.t0->latency_timer = 0x40;
 365                 bridge->hpp.t0->enable_serr = 0;
 366                 bridge->hpp.t0->enable_perr = 0;
 367         }
 368 }
 369
 370
 371
 372 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 373 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 374 {
 375         acpi_status status;
 376
 377         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 378         decode_hpp(bridge);
 379
 380         /* must be added to the list prior to calling register_slot */
 381         list_add(&bridge->list, &bridge_list);
 382
 383         /* register all slot objects under this bridge */
 384         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 385                                      register_slot, bridge, NULL);
 386         if (ACPI_FAILURE(status)) {
 387                 list_del(&bridge->list);
 388                 return;
 389         }
 390
 391         /* install notify handler */
 392         if (bridge->type != BRIDGE_TYPE_HOST) {
 393                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 394                         status = acpi_remove_notify_handler(bridge->func->handle,
 395                                                 ACPI_SYSTEM_NOTIFY,
 396                                                 handle_hotplug_event_func);
 397                         if (ACPI_FAILURE(status))
 398                                 err("failed to remove notify handler\n");
 399                 }
 400                 status = acpi_install_notify_handler(bridge->handle,
 401                                              ACPI_SYSTEM_NOTIFY,
 402                                              handle_hotplug_event_bridge,
 403                                              bridge);
 404
 405                 if (ACPI_FAILURE(status)) {
 406                         err("failed to register interrupt notify handler\n");
 407                 }
 408         }
 409 }
 410
 411
 412 /* find acpiphp_func from acpiphp_bridge */
 413 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 414 {
 415         struct list_head *node, *l;
 416         struct acpiphp_bridge *bridge;
 417         struct acpiphp_slot *slot;
 418         struct acpiphp_func *func;
 419
 420         list_for_each(node, &bridge_list) {
 421                 bridge = list_entry(node, struct acpiphp_bridge, list);
 422                 for (slot = bridge->slots; slot; slot = slot->next) {
 423                         list_for_each(l, &slot->funcs) {
 424                                 func = list_entry(l, struct acpiphp_func,
 425                                                         sibling);
 426                                 if (func->handle == handle)
 427                                         return func;
 428                         }
 429                 }
 430         }
 431
 432         return NULL;
 433 }
 434
 435
 436 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 437 {
 438         acpi_handle dummy_handle;
 439
 440         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 441                                         "_STA", &dummy_handle)))
 442                 bridge->flags |= BRIDGE_HAS_STA;
 443
 444         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 445                                         "_EJ0", &dummy_handle)))
 446                 bridge->flags |= BRIDGE_HAS_EJ0;
 447
 448         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 449                                         "_PS0", &dummy_handle)))
 450                 bridge->flags |= BRIDGE_HAS_PS0;
 451
 452         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
 453                                         "_PS3", &dummy_handle)))
 454                 bridge->flags |= BRIDGE_HAS_PS3;
 455
 456         /* is this ejectable p2p bridge? */
 457         if (bridge->flags & BRIDGE_HAS_EJ0) {
 458                 struct acpiphp_func *func;
 459
 460                 dbg("found ejectable p2p bridge\n");
 461
 462                 /* make link between PCI bridge and PCI function */
 463                 func = acpiphp_bridge_handle_to_function(bridge->handle);
 464                 if (!func)
 465                         return;
 466                 bridge->func = func;
 467                 func->bridge = bridge;
 468         }
 469 }
 470
 471
 472 /* allocate and initialize host bridge data structure */
 473 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 474 {
 475         struct acpiphp_bridge *bridge;
 476
 477         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 478         if (bridge == NULL)
 479                 return;
 480
 481         bridge->type = BRIDGE_TYPE_HOST;
 482         bridge->handle = handle;
 483
 484         bridge->pci_bus = pci_bus;
 485
 486         spin_lock_init(&bridge->res_lock);
 487
 488         init_bridge_misc(bridge);
 489 }
 490
 491
 492 /* allocate and initialize PCI-to-PCI bridge data structure */
 493 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 494 {
 495         struct acpiphp_bridge *bridge;
 496
 497         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 498         if (bridge == NULL) {
 499                 err("out of memory\n");
 500                 return;
 501         }
 502
 503         bridge->type = BRIDGE_TYPE_P2P;
 504         bridge->handle = handle;
 505         config_p2p_bridge_flags(bridge);
 506
 507         bridge->pci_dev = pci_dev_get(pci_dev);
 508         bridge->pci_bus = pci_dev->subordinate;
 509         if (!bridge->pci_bus) {
 510                 err("This is not a PCI-to-PCI bridge!\n");
 511                 goto err;
 512         }
 513
 514         spin_lock_init(&bridge->res_lock);
 515
 516         init_bridge_misc(bridge);
 517         return;
 518  err:
 519         pci_dev_put(pci_dev);
 520         kfree(bridge);
 521         return;
 522 }
 523
 524
 525 /* callback routine to find P2P bridges */
 526 static acpi_status
 527 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 528 {
 529         acpi_status status;
 530         acpi_handle dummy_handle;
 531         unsigned long tmp;
 532         int device, function;
 533         struct pci_dev *dev;
 534         struct pci_bus *pci_bus = context;
 535
 536         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 537         if (ACPI_FAILURE(status))
 538                 return AE_OK;           /* continue */
 539
 540         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 541         if (ACPI_FAILURE(status)) {
 542                 dbg("%s: _ADR evaluation failure\n", __func__);
 543                 return AE_OK;
 544         }
 545
 546         device = (tmp >> 16) & 0xffff;
 547         function = tmp & 0xffff;
 548
 549         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 550
 551         if (!dev || !dev->subordinate)
 552                 goto out;
 553
 554         /* check if this bridge has ejectable slots */
 555         if ((detect_ejectable_slots(handle) > 0)) {
 556                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 557                 add_p2p_bridge(handle, dev);
 558         }
 559
 560         /* search P2P bridges under this p2p bridge */
 561         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 562                                      find_p2p_bridge, dev->subordinate, NULL);
 563         if (ACPI_FAILURE(status))
 564                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 565
 566  out:
 567         pci_dev_put(dev);
 568         return AE_OK;
 569 }
 570
 571
 572 /* find hot-pluggable slots, and then find P2P bridge */
 573 static int add_bridge(acpi_handle handle)
 574 {
 575         acpi_status status;
 576         unsigned long tmp;
 577         int seg, bus;
 578         acpi_handle dummy_handle;
 579         struct pci_bus *pci_bus;
 580
 581         /* if the bridge doesn't have _STA, we assume it is always there */
 582         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 583         if (ACPI_SUCCESS(status)) {
 584                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 585                 if (ACPI_FAILURE(status)) {
 586                         dbg("%s: _STA evaluation failure\n", __func__);
 587                         return 0;
 588                 }
 589                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 590                         /* don't register this object */
 591                         return 0;
 592         }
 593
 594         /* get PCI segment number */
 595         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 596
 597         seg = ACPI_SUCCESS(status) ? tmp : 0;
 598
 599         /* get PCI bus number */
 600         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 601
 602         if (ACPI_SUCCESS(status)) {
 603                 bus = tmp;
 604         } else {
 605                 warn("can't get bus number, assuming 0\n");
 606                 bus = 0;
 607         }
 608
 609         pci_bus = pci_find_bus(seg, bus);
 610         if (!pci_bus) {
 611                 err("Can't find bus %04x:%02x\n", seg, bus);
 612                 return 0;
 613         }
 614
 615         /* check if this bridge has ejectable slots */
 616         if (detect_ejectable_slots(handle) > 0) {
 617                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 618                 add_host_bridge(handle, pci_bus);
 619         }
 620
 621         /* search P2P bridges under this host bridge */
 622         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 623                                      find_p2p_bridge, pci_bus, NULL);
 624
 625         if (ACPI_FAILURE(status))
 626                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 627
 628         return 0;
 629 }
 630
 631 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 632 {
 633         struct list_head *head;
 634         list_for_each(head, &bridge_list) {
 635                 struct acpiphp_bridge *bridge = list_entry(head,
 636                                                 struct acpiphp_bridge, list);
 637                 if (bridge->handle == handle)
 638                         return bridge;
 639         }
 640
 641         return NULL;
 642 }
 643
 644 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 645 {
 646         struct list_head *list, *tmp;
 647         struct acpiphp_slot *slot;
 648         acpi_status status;
 649         acpi_handle handle = bridge->handle;
 650
 651         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 652                                             handle_hotplug_event_bridge);
 653         if (ACPI_FAILURE(status))
 654                 err("failed to remove notify handler\n");
 655
 656         if ((bridge->type != BRIDGE_TYPE_HOST) &&
 657             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
 658                 status = acpi_install_notify_handler(bridge->func->handle,
 659                                                 ACPI_SYSTEM_NOTIFY,
 660                                                 handle_hotplug_event_func,
 661                                                 bridge->func);
 662                 if (ACPI_FAILURE(status))
 663                         err("failed to install interrupt notify handler\n");
 664         }
 665
 666         slot = bridge->slots;
 667         while (slot) {
 668                 struct acpiphp_slot *next = slot->next;
 669                 list_for_each_safe (list, tmp, &slot->funcs) {
 670                         struct acpiphp_func *func;
 671                         func = list_entry(list, struct acpiphp_func, sibling);
 672                         if (is_dock_device(func->handle)) {
 673                                 unregister_hotplug_dock_device(func->handle);
 674                                 unregister_dock_notifier(&func->nb);
 675                         }
 676                         if (!(func->flags & FUNC_HAS_DCK)) {
 677                                 status = acpi_remove_notify_handler(func->handle,
 678                                                 ACPI_SYSTEM_NOTIFY,
 679                                                 handle_hotplug_event_func);
 680                                 if (ACPI_FAILURE(status))
 681                                         err("failed to remove notify handler\n");
 682                         }
 683                         pci_dev_put(func->pci_dev);
 684                         list_del(list);
 685                         kfree(func);
 686                 }
 687                 acpiphp_unregister_hotplug_slot(slot);
 688                 list_del(&slot->funcs);
 689                 kfree(slot);
 690                 slot = next;
 691         }
 692
 693         pci_dev_put(bridge->pci_dev);
 694         list_del(&bridge->list);
 695         kfree(bridge);
 696 }
 697
 698 static acpi_status
 699 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 700 {
 701         struct acpiphp_bridge *bridge;
 702
 703         /* cleanup p2p bridges under this P2P bridge
 704            in a depth-first manner */
 705         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 706                                 cleanup_p2p_bridge, NULL, NULL);
 707
 708         if (!(bridge = acpiphp_handle_to_bridge(handle)))
 709                 return AE_OK;
 710         cleanup_bridge(bridge);
 711         return AE_OK;
 712 }
 713
 714 static void remove_bridge(acpi_handle handle)
 715 {
 716         struct acpiphp_bridge *bridge;
 717
 718         /* cleanup p2p bridges under this host bridge
 719            in a depth-first manner */
 720         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 721                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 722
 723         bridge = acpiphp_handle_to_bridge(handle);
 724         if (bridge)
 725                 cleanup_bridge(bridge);
 726 }
 727
 728 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 729 {
 730         struct acpi_pci_id id;
 731         struct pci_bus *bus;
 732         struct pci_dev *dev;
 733
 734         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 735                 return NULL;
 736
 737         bus = pci_find_bus(id.segment, id.bus);
 738         if (!bus)
 739                 return NULL;
 740
 741         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 742         if (!dev)
 743                 return NULL;
 744
 745         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 746             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 747         {
 748                 pci_dev_put(dev);
 749                 return NULL;
 750         }
 751
 752         return dev;
 753 }
 754
 755 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 756 {
 757         acpi_status status;
 758         int result = -1;
 759         unsigned long gsb;
 760         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 761         union acpi_object *obj;
 762         void *table;
 763
 764         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 765         if (ACPI_SUCCESS(status)) {
 766                 *gsi_base = (u32)gsb;
 767                 return 0;
 768         }
 769
 770         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 771         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 772                 return -1;
 773
 774         obj = buffer.pointer;
 775         if (obj->type != ACPI_TYPE_BUFFER)
 776                 goto out;
 777
 778         table = obj->buffer.pointer;
 779         switch (((struct acpi_subtable_header *)table)->type) {
 780         case ACPI_MADT_TYPE_IO_SAPIC:
 781                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
 782                 result = 0;
 783                 break;
 784         case ACPI_MADT_TYPE_IO_APIC:
 785                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
 786                 result = 0;
 787                 break;
 788         default:
 789                 break;
 790         }
 791  out:
 792         kfree(buffer.pointer);
 793         return result;
 794 }
 795
 796 static acpi_status
 797 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 798 {
 799         acpi_status status;
 800         unsigned long sta;
 801         acpi_handle tmp;
 802         struct pci_dev *pdev;
 803         u32 gsi_base;
 804         u64 phys_addr;
 805         struct acpiphp_ioapic *ioapic;
 806
 807         /* Evaluate _STA if present */
 808         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 809         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 810                 return AE_CTRL_DEPTH;
 811
 812         /* Scan only PCI bus scope */
 813         status = acpi_get_handle(handle, "_HID", &tmp);
 814         if (ACPI_SUCCESS(status))
 815                 return AE_CTRL_DEPTH;
 816
 817         if (get_gsi_base(handle, &gsi_base))
 818                 return AE_OK;
 819
 820         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
 821         if (!ioapic)
 822                 return AE_NO_MEMORY;
 823
 824         pdev = get_apic_pci_info(handle);
 825         if (!pdev)
 826                 goto exit_kfree;
 827
 828         if (pci_enable_device(pdev))
 829                 goto exit_pci_dev_put;
 830
 831         pci_set_master(pdev);
 832
 833         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
 834                 goto exit_pci_disable_device;
 835
 836         phys_addr = pci_resource_start(pdev, 0);
 837         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
 838                 goto exit_pci_release_region;
 839
 840         ioapic->gsi_base = gsi_base;
 841         ioapic->dev = pdev;
 842         spin_lock(&ioapic_list_lock);
 843         list_add_tail(&ioapic->list, &ioapic_list);
 844         spin_unlock(&ioapic_list_lock);
 845
 846         return AE_OK;
 847
 848  exit_pci_release_region:
 849         pci_release_region(pdev, 0);
 850  exit_pci_disable_device:
 851         pci_disable_device(pdev);
 852  exit_pci_dev_put:
 853         pci_dev_put(pdev);
 854  exit_kfree:
 855         kfree(ioapic);
 856
 857         return AE_OK;
 858 }
 859
 860 static acpi_status
 861 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 862 {
 863         acpi_status status;
 864         unsigned long sta;
 865         acpi_handle tmp;
 866         u32 gsi_base;
 867         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 868
 869         /* Evaluate _STA if present */
 870         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 871         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 872                 return AE_CTRL_DEPTH;
 873
 874         /* Scan only PCI bus scope */
 875         status = acpi_get_handle(handle, "_HID", &tmp);
 876         if (ACPI_SUCCESS(status))
 877                 return AE_CTRL_DEPTH;
 878
 879         if (get_gsi_base(handle, &gsi_base))
 880                 return AE_OK;
 881
 882         acpi_unregister_ioapic(handle, gsi_base);
 883
 884         spin_lock(&ioapic_list_lock);
 885         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
 886                 if (pos->gsi_base != gsi_base)
 887                         continue;
 888                 ioapic = pos;
 889                 list_del(&ioapic->list);
 890                 break;
 891         }
 892         spin_unlock(&ioapic_list_lock);
 893
 894         if (!ioapic)
 895                 return AE_OK;
 896
 897         pci_release_region(ioapic->dev, 0);
 898         pci_disable_device(ioapic->dev);
 899         pci_dev_put(ioapic->dev);
 900         kfree(ioapic);
 901
 902         return AE_OK;
 903 }
 904
 905 static int acpiphp_configure_ioapics(acpi_handle handle)
 906 {
 907         ioapic_add(handle, 0, NULL, NULL);
 908         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 909                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 910         return 0;
 911 }
 912
 913 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 914 {
 915         ioapic_remove(handle, 0, NULL, NULL);
 916         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 917                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
 918         return 0;
 919 }
 920
 921 static int power_on_slot(struct acpiphp_slot *slot)
 922 {
 923         acpi_status status;
 924         struct acpiphp_func *func;
 925         struct list_head *l;
 926         int retval = 0;
 927
 928         /* if already enabled, just skip */
 929         if (slot->flags & SLOT_POWEREDON)
 930                 goto err_exit;
 931
 932         list_for_each (l, &slot->funcs) {
 933                 func = list_entry(l, struct acpiphp_func, sibling);
 934
 935                 if (func->flags & FUNC_HAS_PS0) {
 936                         dbg("%s: executing _PS0\n", __func__);
 937                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 938                         if (ACPI_FAILURE(status)) {
 939                                 warn("%s: _PS0 failed\n", __func__);
 940                                 retval = -1;
 941                                 goto err_exit;
 942                         } else
 943                                 break;
 944                 }
 945         }
 946
 947         /* TBD: evaluate _STA to check if the slot is enabled */
 948
 949         slot->flags |= SLOT_POWEREDON;
 950
 951  err_exit:
 952         return retval;
 953 }
 954
 955
 956 static int power_off_slot(struct acpiphp_slot *slot)
 957 {
 958         acpi_status status;
 959         struct acpiphp_func *func;
 960         struct list_head *l;
 961
 962         int retval = 0;
 963
 964         /* if already disabled, just skip */
 965         if ((slot->flags & SLOT_POWEREDON) == 0)
 966                 goto err_exit;
 967
 968         list_for_each (l, &slot->funcs) {
 969                 func = list_entry(l, struct acpiphp_func, sibling);
 970
 971                 if (func->flags & FUNC_HAS_PS3) {
 972                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 973                         if (ACPI_FAILURE(status)) {
 974                                 warn("%s: _PS3 failed\n", __func__);
 975                                 retval = -1;
 976                                 goto err_exit;
 977                         } else
 978                                 break;
 979                 }
 980         }
 981
 982         /* TBD: evaluate _STA to check if the slot is disabled */
 983
 984         slot->flags &= (~SLOT_POWEREDON);
 985
 986  err_exit:
 987         return retval;
 988 }
 989
 990
 991
 992 /**
 993  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
 994  * @bus: bus to start search with
 995  */
 996 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
 997 {
 998         struct list_head *tmp;
 999         unsigned char max, n;
1000
1001         /*
1002          * pci_bus_max_busnr will return the highest
1003          * reserved busnr for all these children.
1004          * that is equivalent to the bus->subordinate
1005          * value.  We don't want to use the parent's
1006          * bus->subordinate value because it could have
1007          * padding in it.
1008          */
1009         max = bus->secondary;
1010
1011         list_for_each(tmp, &bus->children) {
1012                 n = pci_bus_max_busnr(pci_bus_b(tmp));
1013                 if (n > max)
1014                         max = n;
1015         }
1016         return max;
1017 }
1018
1019
1020 /**
1021  * acpiphp_bus_add - add a new bus to acpi subsystem
1022  * @func: acpiphp_func of the bridge
1023  */
1024 static int acpiphp_bus_add(struct acpiphp_func *func)
1025 {
1026         acpi_handle phandle;
1027         struct acpi_device *device, *pdevice;
1028         int ret_val;
1029
1030         acpi_get_parent(func->handle, &phandle);
1031         if (acpi_bus_get_device(phandle, &pdevice)) {
1032                 dbg("no parent device, assuming NULL\n");
1033                 pdevice = NULL;
1034         }
1035         if (!acpi_bus_get_device(func->handle, &device)) {
1036                 dbg("bus exists... trim\n");
1037                 /* this shouldn't be in here, so remove
1038                  * the bus then re-add it...
1039                  */
1040                 ret_val = acpi_bus_trim(device, 1);
1041                 dbg("acpi_bus_trim return %x\n", ret_val);
1042         }
1043
1044         ret_val = acpi_bus_add(&device, pdevice, func->handle,
1045                 ACPI_BUS_TYPE_DEVICE);
1046         if (ret_val) {
1047                 dbg("error adding bus, %x\n",
1048                         -ret_val);
1049                 goto acpiphp_bus_add_out;
1050         }
1051         /*
1052          * try to start anyway.  We could have failed to add
1053          * simply because this bus had previously been added
1054          * on another add.  Don't bother with the return value
1055          * we just keep going.
1056          */
1057         ret_val = acpi_bus_start(device);
1058
1059 acpiphp_bus_add_out:
1060         return ret_val;
1061 }
1062
1063
1064 /**
1065  * acpiphp_bus_trim - trim a bus from acpi subsystem
1066  * @handle: handle to acpi namespace
1067  */
1068 static int acpiphp_bus_trim(acpi_handle handle)
1069 {
1070         struct acpi_device *device;
1071         int retval;
1072
1073         retval = acpi_bus_get_device(handle, &device);
1074         if (retval) {
1075                 dbg("acpi_device not found\n");
1076                 return retval;
1077         }
1078
1079         retval = acpi_bus_trim(device, 1);
1080         if (retval)
1081                 err("cannot remove from acpi list\n");
1082
1083         return retval;
1084 }
1085
1086 /**
1087  * enable_device - enable, configure a slot
1088  * @slot: slot to be enabled
1089  *
1090  * This function should be called per *physical slot*,
1091  * not per each slot object in ACPI namespace.
1092  */
1093 static int __ref enable_device(struct acpiphp_slot *slot)
1094 {
1095         struct pci_dev *dev;
1096         struct pci_bus *bus = slot->bridge->pci_bus;
1097         struct list_head *l;
1098         struct acpiphp_func *func;
1099         int retval = 0;
1100         int num, max, pass;
1101         acpi_status status;
1102
1103         if (slot->flags & SLOT_ENABLED)
1104                 goto err_exit;
1105
1106         /* sanity check: dev should be NULL when hot-plugged in */
1107         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1108         if (dev) {
1109                 /* This case shouldn't happen */
1110                 err("pci_dev structure already exists.\n");
1111                 pci_dev_put(dev);
1112                 retval = -1;
1113                 goto err_exit;
1114         }
1115
1116         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1117         if (num == 0) {
1118                 err("No new device found\n");
1119                 retval = -1;
1120                 goto err_exit;
1121         }
1122
1123         max = acpiphp_max_busnr(bus);
1124         for (pass = 0; pass < 2; pass++) {
1125                 list_for_each_entry(dev, &bus->devices, bus_list) {
1126                         if (PCI_SLOT(dev->devfn) != slot->device)
1127                                 continue;
1128                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1129                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1130                                 max = pci_scan_bridge(bus, dev, max, pass);
1131                                 if (pass && dev->subordinate)
1132                                         pci_bus_size_bridges(dev->subordinate);
1133                         }
1134                 }
1135         }
1136
1137         list_for_each (l, &slot->funcs) {
1138                 func = list_entry(l, struct acpiphp_func, sibling);
1139                 acpiphp_bus_add(func);
1140         }
1141
1142         pci_bus_assign_resources(bus);
1143         acpiphp_sanitize_bus(bus);
1144         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1145         list_for_each_entry(func, &slot->funcs, sibling)
1146                 acpiphp_configure_ioapics(func->handle);
1147         pci_enable_bridges(bus);
1148         pci_bus_add_devices(bus);
1149
1150         /* associate pci_dev to our representation */
1151         list_for_each (l, &slot->funcs) {
1152                 func = list_entry(l, struct acpiphp_func, sibling);
1153                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1154                                                         func->function));
1155                 if (!func->pci_dev)
1156                         continue;
1157
1158                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1159                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1160                         continue;
1161
1162                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1163                 if (ACPI_FAILURE(status))
1164                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1165                                 status);
1166         }
1167
1168         slot->flags |= SLOT_ENABLED;
1169
1170  err_exit:
1171         return retval;
1172 }
1173
1174 static void disable_bridges(struct pci_bus *bus)
1175 {
1176         struct pci_dev *dev;
1177         list_for_each_entry(dev, &bus->devices, bus_list) {
1178                 if (dev->subordinate) {
1179                         disable_bridges(dev->subordinate);
1180                         pci_disable_device(dev);
1181                 }
1182         }
1183 }
1184
1185 /**
1186  * disable_device - disable a slot
1187  * @slot: ACPI PHP slot
1188  */
1189 static int disable_device(struct acpiphp_slot *slot)
1190 {
1191         int retval = 0;
1192         struct acpiphp_func *func;
1193         struct list_head *l;
1194
1195         /* is this slot already disabled? */
1196         if (!(slot->flags & SLOT_ENABLED))
1197                 goto err_exit;
1198
1199         list_for_each (l, &slot->funcs) {
1200                 func = list_entry(l, struct acpiphp_func, sibling);
1201
1202                 if (func->bridge) {
1203                         /* cleanup p2p bridges under this P2P bridge */
1204                         cleanup_p2p_bridge(func->bridge->handle,
1205                                                 (u32)1, NULL, NULL);
1206                         func->bridge = NULL;
1207                 }
1208
1209                 if (func->pci_dev) {
1210                         pci_stop_bus_device(func->pci_dev);
1211                         if (func->pci_dev->subordinate) {
1212                                 disable_bridges(func->pci_dev->subordinate);
1213                                 pci_disable_device(func->pci_dev);
1214                         }
1215                 }
1216         }
1217
1218         list_for_each (l, &slot->funcs) {
1219                 func = list_entry(l, struct acpiphp_func, sibling);
1220
1221                 acpiphp_unconfigure_ioapics(func->handle);
1222                 acpiphp_bus_trim(func->handle);
1223                 /* try to remove anyway.
1224                  * acpiphp_bus_add might have been failed */
1225
1226                 if (!func->pci_dev)
1227                         continue;
1228
1229                 pci_remove_bus_device(func->pci_dev);
1230                 pci_dev_put(func->pci_dev);
1231                 func->pci_dev = NULL;
1232         }
1233
1234         slot->flags &= (~SLOT_ENABLED);
1235
1236  err_exit:
1237         return retval;
1238 }
1239
1240
1241 /**
1242  * get_slot_status - get ACPI slot status
1243  * @slot: ACPI PHP slot
1244  *
1245  * If a slot has _STA for each function and if any one of them
1246  * returned non-zero status, return it.
1247  *
1248  * If a slot doesn't have _STA and if any one of its functions'
1249  * configuration space is configured, return 0x0f as a _STA.
1250  *
1251  * Otherwise return 0.
1252  */
1253 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1254 {
1255         acpi_status status;
1256         unsigned long sta = 0;
1257         u32 dvid;
1258         struct list_head *l;
1259         struct acpiphp_func *func;
1260
1261         list_for_each (l, &slot->funcs) {
1262                 func = list_entry(l, struct acpiphp_func, sibling);
1263
1264                 if (func->flags & FUNC_HAS_STA) {
1265                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1266                         if (ACPI_SUCCESS(status) && sta)
1267                                 break;
1268                 } else {
1269                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1270                                                   PCI_DEVFN(slot->device,
1271                                                             func->function),
1272                                                   PCI_VENDOR_ID, &dvid);
1273                         if (dvid != 0xffffffff) {
1274                                 sta = ACPI_STA_ALL;
1275                                 break;
1276                         }
1277                 }
1278         }
1279
1280         return (unsigned int)sta;
1281 }
1282
1283 /**
1284  * acpiphp_eject_slot - physically eject the slot
1285  * @slot: ACPI PHP slot
1286  */
1287 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1288 {
1289         acpi_status status;
1290         struct acpiphp_func *func;
1291         struct list_head *l;
1292         struct acpi_object_list arg_list;
1293         union acpi_object arg;
1294
1295         list_for_each (l, &slot->funcs) {
1296                 func = list_entry(l, struct acpiphp_func, sibling);
1297
1298                 /* We don't want to call _EJ0 on non-existing functions. */
1299                 if ((func->flags & FUNC_HAS_EJ0)) {
1300                         /* _EJ0 method take one argument */
1301                         arg_list.count = 1;
1302                         arg_list.pointer = &arg;
1303                         arg.type = ACPI_TYPE_INTEGER;
1304                         arg.integer.value = 1;
1305
1306                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1307                         if (ACPI_FAILURE(status)) {
1308                                 warn("%s: _EJ0 failed\n", __func__);
1309                                 return -1;
1310                         } else
1311                                 break;
1312                 }
1313         }
1314         return 0;
1315 }
1316
1317 /**
1318  * acpiphp_check_bridge - re-enumerate devices
1319  * @bridge: where to begin re-enumeration
1320  *
1321  * Iterate over all slots under this bridge and make sure that if a
1322  * card is present they are enabled, and if not they are disabled.
1323  */
1324 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1325 {
1326         struct acpiphp_slot *slot;
1327         int retval = 0;
1328         int enabled, disabled;
1329
1330         enabled = disabled = 0;
1331
1332         for (slot = bridge->slots; slot; slot = slot->next) {
1333                 unsigned int status = get_slot_status(slot);
1334                 if (slot->flags & SLOT_ENABLED) {
1335                         if (status == ACPI_STA_ALL)
1336                                 continue;
1337                         retval = acpiphp_disable_slot(slot);
1338                         if (retval) {
1339                                 err("Error occurred in disabling\n");
1340                                 goto err_exit;
1341                         } else {
1342                                 acpiphp_eject_slot(slot);
1343                         }
1344                         disabled++;
1345                 } else {
1346                         if (status != ACPI_STA_ALL)
1347                                 continue;
1348                         retval = acpiphp_enable_slot(slot);
1349                         if (retval) {
1350                                 err("Error occurred in enabling\n");
1351                                 goto err_exit;
1352                         }
1353                         enabled++;
1354                 }
1355         }
1356
1357         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1358
1359  err_exit:
1360         return retval;
1361 }
1362
1363 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1364 {
1365         u16 pci_cmd, pci_bctl;
1366         struct pci_dev *cdev;
1367
1368         /* Program hpp values for this device */
1369         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1370                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1371                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1372                 return;
1373
1374         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1375                 return;
1376
1377         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1378                         bridge->hpp.t0->cache_line_size);
1379         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1380                         bridge->hpp.t0->latency_timer);
1381         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1382         if (bridge->hpp.t0->enable_serr)
1383                 pci_cmd |= PCI_COMMAND_SERR;
1384         else
1385                 pci_cmd &= ~PCI_COMMAND_SERR;
1386         if (bridge->hpp.t0->enable_perr)
1387                 pci_cmd |= PCI_COMMAND_PARITY;
1388         else
1389                 pci_cmd &= ~PCI_COMMAND_PARITY;
1390         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1391
1392         /* Program bridge control value and child devices */
1393         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1394                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1395                                 bridge->hpp.t0->latency_timer);
1396                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1397                 if (bridge->hpp.t0->enable_serr)
1398                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1399                 else
1400                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1401                 if (bridge->hpp.t0->enable_perr)
1402                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1403                 else
1404                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1405                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1406                 if (dev->subordinate) {
1407                         list_for_each_entry(cdev, &dev->subordinate->devices,
1408                                         bus_list)
1409                                 program_hpp(cdev, bridge);
1410                 }
1411         }
1412 }
1413
1414 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1415 {
1416         struct acpiphp_bridge bridge;
1417         struct pci_dev *dev;
1418
1419         memset(&bridge, 0, sizeof(bridge));
1420         bridge.handle = handle;
1421         bridge.pci_bus = bus;
1422         bridge.pci_dev = bus->self;
1423         decode_hpp(&bridge);
1424         list_for_each_entry(dev, &bus->devices, bus_list)
1425                 program_hpp(dev, &bridge);
1426
1427 }
1428
1429 /*
1430  * Remove devices for which we could not assign resources, call
1431  * arch specific code to fix-up the bus
1432  */
1433 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1434 {
1435         struct pci_dev *dev;
1436         int i;
1437         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1438
1439         list_for_each_entry(dev, &bus->devices, bus_list) {
1440                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1441                         struct resource *res = &dev->resource[i];
1442                         if ((res->flags & type_mask) && !res->start &&
1443                                         res->end) {
1444                                 /* Could not assign a required resources
1445                                  * for this device, remove it */
1446                                 pci_remove_bus_device(dev);
1447                                 break;
1448                         }
1449                 }
1450         }
1451 }
1452
1453 /* Program resources in newly inserted bridge */
1454 static int acpiphp_configure_bridge (acpi_handle handle)
1455 {
1456         struct acpi_pci_id pci_id;
1457         struct pci_bus *bus;
1458
1459         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1460                 err("cannot get PCI domain and bus number for bridge\n");
1461                 return -EINVAL;
1462         }
1463         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1464         if (!bus) {
1465                 err("cannot find bus %d:%d\n",
1466                                 pci_id.segment, pci_id.bus);
1467                 return -EINVAL;
1468         }
1469
1470         pci_bus_size_bridges(bus);
1471         pci_bus_assign_resources(bus);
1472         acpiphp_sanitize_bus(bus);
1473         acpiphp_set_hpp_values(handle, bus);
1474         pci_enable_bridges(bus);
1475         acpiphp_configure_ioapics(handle);
1476         return 0;
1477 }
1478
1479 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1480 {
1481         struct acpi_device *device, *pdevice;
1482         acpi_handle phandle;
1483
1484         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1485                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1486                 err("unexpected notification type %d\n", type);
1487                 return;
1488         }
1489
1490         acpi_get_parent(handle, &phandle);
1491         if (acpi_bus_get_device(phandle, &pdevice)) {
1492                 dbg("no parent device, assuming NULL\n");
1493                 pdevice = NULL;
1494         }
1495         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1496                 err("cannot add bridge to acpi list\n");
1497                 return;
1498         }
1499         if (!acpiphp_configure_bridge(handle) &&
1500                 !acpi_bus_start(device))
1501                 add_bridge(handle);
1502         else
1503                 err("cannot configure and start bridge\n");
1504
1505 }
1506
1507 /*
1508  * ACPI event handlers
1509  */
1510
1511 static acpi_status
1512 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1513 {
1514         int *count = (int *)context;
1515         struct acpiphp_bridge *bridge;
1516
1517         bridge = acpiphp_handle_to_bridge(handle);
1518         if (bridge)
1519                 (*count)++;
1520         return AE_OK ;
1521 }
1522
1523 static acpi_status
1524 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1525 {
1526         struct acpiphp_bridge *bridge;
1527         char objname[64];
1528         struct acpi_buffer buffer = { .length = sizeof(objname),
1529                                       .pointer = objname };
1530
1531         bridge = acpiphp_handle_to_bridge(handle);
1532         if (bridge) {
1533                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1534                 dbg("%s: re-enumerating slots under %s\n",
1535                         __func__, objname);
1536                 acpiphp_check_bridge(bridge);
1537         }
1538         return AE_OK ;
1539 }
1540
1541 /**
1542  * handle_hotplug_event_bridge - handle ACPI event on bridges
1543  * @handle: Notify()'ed acpi_handle
1544  * @type: Notify code
1545  * @context: pointer to acpiphp_bridge structure
1546  *
1547  * Handles ACPI event notification on {host,p2p} bridges.
1548  */
1549 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1550 {
1551         struct acpiphp_bridge *bridge;
1552         char objname[64];
1553         struct acpi_buffer buffer = { .length = sizeof(objname),
1554                                       .pointer = objname };
1555         struct acpi_device *device;
1556         int num_sub_bridges = 0;
1557
1558         if (acpi_bus_get_device(handle, &device)) {
1559                 /* This bridge must have just been physically inserted */
1560                 handle_bridge_insertion(handle, type);
1561                 return;
1562         }
1563
1564         bridge = acpiphp_handle_to_bridge(handle);
1565         if (type == ACPI_NOTIFY_BUS_CHECK) {
1566                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1567                         count_sub_bridges, &num_sub_bridges, NULL);
1568         }
1569
1570         if (!bridge && !num_sub_bridges) {
1571                 err("cannot get bridge info\n");
1572                 return;
1573         }
1574
1575         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1576
1577         switch (type) {
1578         case ACPI_NOTIFY_BUS_CHECK:
1579                 /* bus re-enumerate */
1580                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1581                 if (bridge) {
1582                         dbg("%s: re-enumerating slots under %s\n",
1583                                 __func__, objname);
1584                         acpiphp_check_bridge(bridge);
1585                 }
1586                 if (num_sub_bridges)
1587                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1588                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1589                 break;
1590
1591         case ACPI_NOTIFY_DEVICE_CHECK:
1592                 /* device check */
1593                 dbg("%s: Device check notify on %s\n", __func__, objname);
1594                 acpiphp_check_bridge(bridge);
1595                 break;
1596
1597         case ACPI_NOTIFY_DEVICE_WAKE:
1598                 /* wake event */
1599                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1600                 break;
1601
1602         case ACPI_NOTIFY_EJECT_REQUEST:
1603                 /* request device eject */
1604                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1605                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1606                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1607                         struct acpiphp_slot *slot;
1608                         slot = bridge->func->slot;
1609                         if (!acpiphp_disable_slot(slot))
1610                                 acpiphp_eject_slot(slot);
1611                 }
1612                 break;
1613
1614         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1615                 printk(KERN_ERR "Device %s cannot be configured due"
1616                                 " to a frequency mismatch\n", objname);
1617                 break;
1618
1619         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1620                 printk(KERN_ERR "Device %s cannot be configured due"
1621                                 " to a bus mode mismatch\n", objname);
1622                 break;
1623
1624         case ACPI_NOTIFY_POWER_FAULT:
1625                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1626                                 objname);
1627                 break;
1628
1629         default:
1630                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1631                 break;
1632         }
1633 }
1634
1635 /**
1636  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1637  * @handle: Notify()'ed acpi_handle
1638  * @type: Notify code
1639  * @context: pointer to acpiphp_func structure
1640  *
1641  * Handles ACPI event notification on slots.
1642  */
1643 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1644 {
1645         struct acpiphp_func *func;
1646         char objname[64];
1647         struct acpi_buffer buffer = { .length = sizeof(objname),
1648                                       .pointer = objname };
1649
1650         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1651
1652         func = (struct acpiphp_func *)context;
1653
1654         switch (type) {
1655         case ACPI_NOTIFY_BUS_CHECK:
1656                 /* bus re-enumerate */
1657                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1658                 acpiphp_enable_slot(func->slot);
1659                 break;
1660
1661         case ACPI_NOTIFY_DEVICE_CHECK:
1662                 /* device check : re-enumerate from parent bus */
1663                 dbg("%s: Device check notify on %s\n", __func__, objname);
1664                 acpiphp_check_bridge(func->slot->bridge);
1665                 break;
1666
1667         case ACPI_NOTIFY_DEVICE_WAKE:
1668                 /* wake event */
1669                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1670                 break;
1671
1672         case ACPI_NOTIFY_EJECT_REQUEST:
1673                 /* request device eject */
1674                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1675                 if (!(acpiphp_disable_slot(func->slot)))
1676                         acpiphp_eject_slot(func->slot);
1677                 break;
1678
1679         default:
1680                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1681                 break;
1682         }
1683 }
1684
1685
1686 static acpi_status
1687 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1688 {
1689         int *count = (int *)context;
1690
1691         if (acpi_root_bridge(handle)) {
1692                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1693                                 handle_hotplug_event_bridge, NULL);
1694                         (*count)++;
1695         }
1696         return AE_OK ;
1697 }
1698
1699 static struct acpi_pci_driver acpi_pci_hp_driver = {
1700         .add =          add_bridge,
1701         .remove =       remove_bridge,
1702 };
1703
1704 /**
1705  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1706  */
1707 int __init acpiphp_glue_init(void)
1708 {
1709         int num = 0;
1710
1711         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1712                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1713
1714         if (num <= 0)
1715                 return -1;
1716         else
1717                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1718
1719         return 0;
1720 }
1721
1722
1723 /**
1724  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1725  *
1726  * This function frees all data allocated in acpiphp_glue_init().
1727  */
1728 void  acpiphp_glue_exit(void)
1729 {
1730         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1731 }
1732
1733
1734 /**
1735  * acpiphp_get_num_slots - count number of slots in a system
1736  */
1737 int __init acpiphp_get_num_slots(void)
1738 {
1739         struct acpiphp_bridge *bridge;
1740         int num_slots = 0;
1741
1742         list_for_each_entry (bridge, &bridge_list, list) {
1743                 dbg("Bus %04x:%02x has %d slot%s\n",
1744                                 pci_domain_nr(bridge->pci_bus),
1745                                 bridge->pci_bus->number, bridge->nr_slots,
1746                                 bridge->nr_slots == 1 ? "" : "s");
1747                 num_slots += bridge->nr_slots;
1748         }
1749
1750         dbg("Total %d slots\n", num_slots);
1751         return num_slots;
1752 }
1753
1754
1755 #if 0
1756 /**
1757  * acpiphp_for_each_slot - call function for each slot
1758  * @fn: callback function
1759  * @data: context to be passed to callback function
1760  */
1761 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1762 {
1763         struct list_head *node;
1764         struct acpiphp_bridge *bridge;
1765         struct acpiphp_slot *slot;
1766         int retval = 0;
1767
1768         list_for_each (node, &bridge_list) {
1769                 bridge = (struct acpiphp_bridge *)node;
1770                 for (slot = bridge->slots; slot; slot = slot->next) {
1771                         retval = fn(slot, data);
1772                         if (!retval)
1773                                 goto err_exit;
1774                 }
1775         }
1776
1777  err_exit:
1778         return retval;
1779 }
1780 #endif
1781
1782
1783 /**
1784  * acpiphp_enable_slot - power on slot
1785  * @slot: ACPI PHP slot
1786  */
1787 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1788 {
1789         int retval;
1790
1791         mutex_lock(&slot->crit_sect);
1792
1793         /* wake up all functions */
1794         retval = power_on_slot(slot);
1795         if (retval)
1796                 goto err_exit;
1797
1798         if (get_slot_status(slot) == ACPI_STA_ALL) {
1799                 /* configure all functions */
1800                 retval = enable_device(slot);
1801                 if (retval)
1802                         power_off_slot(slot);
1803         } else {
1804                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1805                 power_off_slot(slot);
1806         }
1807
1808  err_exit:
1809         mutex_unlock(&slot->crit_sect);
1810         return retval;
1811 }
1812
1813 /**
1814  * acpiphp_disable_slot - power off slot
1815  * @slot: ACPI PHP slot
1816  */
1817 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1818 {
1819         int retval = 0;
1820
1821         mutex_lock(&slot->crit_sect);
1822
1823         /* unconfigure all functions */
1824         retval = disable_device(slot);
1825         if (retval)
1826                 goto err_exit;
1827
1828         /* power off all functions */
1829         retval = power_off_slot(slot);
1830         if (retval)
1831                 goto err_exit;
1832
1833  err_exit:
1834         mutex_unlock(&slot->crit_sect);
1835         return retval;
1836 }
1837
1838
1839 /*
1840  * slot enabled:  1
1841  * slot disabled: 0
1842  */
1843 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1844 {
1845         return (slot->flags & SLOT_POWEREDON);
1846 }
1847
1848
1849 /*
1850  * latch   open:  1
1851  * latch closed:  0
1852  */
1853 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1854 {
1855         unsigned int sta;
1856
1857         sta = get_slot_status(slot);
1858
1859         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1860 }
1861
1862
1863 /*
1864  * adapter presence : 1
1865  *          absence : 0
1866  */
1867 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1868 {
1869         unsigned int sta;
1870
1871         sta = get_slot_status(slot);
1872
1873         return (sta == 0) ? 0 : 1;
1874 }