drivers/pci/hotplug/acpiphp_glue.c

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