ClabureDB: Classified Bug-Reports Database

   /*
    * ACPI PCI HotPlug glue functions to ACPI CA subsystem
    *
    * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
    * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
    * Copyright (C) 2002,2003 NEC Corporation
    * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
    * Copyright (C) 2003-2005 Hewlett Packard
    * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
   * Copyright (C) 2005 Intel Corporation
   *
   * All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or (at
   * your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
   * NON INFRINGEMENT.  See the GNU General Public License for more
   * details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   *
   * Send feedback to <kristen.c.accardi@intel.com>
   *
   */
  
  /*
   * Lifetime rules for pci_dev:
   *  - The one in acpiphp_func has its refcount elevated by pci_get_slot()
   *    when the driver is loaded or when an insertion event occurs.  It loses
   *    a refcount when its ejected or the driver unloads.
   *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
   *    when the bridge is scanned and it loses a refcount when the bridge
   *    is removed.
   */
  
  #include <linux/init.h>
  #include <linux/module.h>
  
  #include <linux/kernel.h>
  #include <linux/pci.h>
  #include <linux/pci_hotplug.h>
  #include <linux/mutex.h>
  
  #include "../pci.h"
  #include "acpiphp.h"
  
  static LIST_HEAD(bridge_list);
  static LIST_HEAD(ioapic_list);
  static DEFINE_SPINLOCK(ioapic_list_lock);
  
  #define MY_NAME "acpiphp_glue"
  
  static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
  static void acpiphp_sanitize_bus(struct pci_bus *bus);
  static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
  static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
  
  
  /*
   * initialization & terminatation routines
   */
  
  /**
   * is_ejectable - determine if a slot is ejectable
   * @handle: handle to acpi namespace
   *
   * Ejectable slot should satisfy at least these conditions:
   *
   *  1. has _ADR method
   *  2. has _EJ0 method
   *
   * optionally
   *
   *  1. has _STA method
   *  2. has _PS0 method
   *  3. has _PS3 method
   *  4. ..
   */
  static int is_ejectable(acpi_handle handle)
  {
          acpi_status status;
          acpi_handle tmp;
  
          status = acpi_get_handle(handle, "_ADR", &tmp);
          if (ACPI_FAILURE(status)) {
                  return 0;
          }
  
          status = acpi_get_handle(handle, "_EJ0", &tmp);
          if (ACPI_FAILURE(status)) {
                  return 0;
          }
 
         return 1;
 }
 
 
 /* callback routine to check for the existence of ejectable slots */
 static acpi_status
 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
         int *count = (int *)context;
 
         if (is_ejectable(handle)) {
                 (*count)++;
                 /* only one ejectable slot is enough */
                 return AE_CTRL_TERMINATE;
         } else {
                 return AE_OK;
         }
 }
 
 /* callback routine to check for the existence of a pci dock device */
 static acpi_status
 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
         int *count = (int *)context;
 
         if (is_dock_device(handle)) {
                 (*count)++;
                 return AE_CTRL_TERMINATE;
         } else {
                 return AE_OK;
         }
 }
 
 
 
 
 /*
  * the _DCK method can do funny things... and sometimes not
  * hah-hah funny.
  *
  * TBD - figure out a way to only call fixups for
  * systems that require them.
  */
 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
         void *v)
 {
         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
         struct pci_bus *bus = func->slot->bridge->pci_bus;
         u32 buses;
 
         if (!bus->self)
                 return  NOTIFY_OK;
 
         /* fixup bad _DCK function that rewrites
          * secondary bridge on slot
          */
         pci_read_config_dword(bus->self,
                         PCI_PRIMARY_BUS,
                         &buses);
 
         if (((buses >> 8) & 0xff) != bus->secondary) {
                 buses = (buses & 0xff000000)
                              | ((unsigned int)(bus->primary)     <<  0)
                              | ((unsigned int)(bus->secondary)   <<  8)
                              | ((unsigned int)(bus->subordinate) << 16);
                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
         }
         return NOTIFY_OK;
 }
 
 
 static struct acpi_dock_ops acpiphp_dock_ops = {
         .handler = handle_hotplug_event_func,
 };
 
 /* callback routine to register each ACPI PCI slot object */
 static acpi_status
 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
         struct acpiphp_slot *slot;
         struct acpiphp_func *newfunc;
         acpi_handle tmp;
         acpi_status status = AE_OK;
         unsigned long long adr, sun;
         int device, function, retval;
 
         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 
         if (ACPI_FAILURE(status))
                 return AE_OK;
 
         status = acpi_get_handle(handle, "_EJ0", &tmp);
 
         if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
                 return AE_OK;
 
         device = (adr >> 16) & 0xffff;
         function = adr & 0xffff;
 
         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
         if (!newfunc)
                 return AE_NO_MEMORY;
 
         INIT_LIST_HEAD(&newfunc->sibling);
         newfunc->handle = handle;
         newfunc->function = function;
         if (ACPI_SUCCESS(status))
                 newfunc->flags = FUNC_HAS_EJ0;
 
         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
                 newfunc->flags |= FUNC_HAS_STA;
 
         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
                 newfunc->flags |= FUNC_HAS_PS0;
 
         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
                 newfunc->flags |= FUNC_HAS_PS3;
 
         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
                 newfunc->flags |= FUNC_HAS_DCK;
 
         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
         if (ACPI_FAILURE(status)) {
                 /*
                  * use the count of the number of slots we've found
                  * for the number of the slot
                  */
                 sun = bridge->nr_slots+1;
         }
 
         /* search for objects that share the same slot */
         for (slot = bridge->slots; slot; slot = slot->next)
                 if (slot->device == device) {
                         if (slot->sun != sun)
                                 warn("sibling found, but _SUN doesn't match!\n");
                         break;
                 }
 
         if (!slot) {
                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
                 if (!slot) {
                         kfree(newfunc);
                         return AE_NO_MEMORY;
                 }
 
                 slot->bridge = bridge;
                 slot->device = device;
                 slot->sun = sun;
                 INIT_LIST_HEAD(&slot->funcs);
                 mutex_init(&slot->crit_sect);
 
                 slot->next = bridge->slots;
                 bridge->slots = slot;
 
                 bridge->nr_slots++;
 
                 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
                                 slot->sun, pci_domain_nr(bridge->pci_bus),
                                 bridge->pci_bus->number, slot->device);
                 retval = acpiphp_register_hotplug_slot(slot);
                 if (retval) {
                         if (retval == -EBUSY)
                                 warn("Slot %llu already registered by another "
                                         "hotplug driver\n", slot->sun);
                         else
                                 warn("acpiphp_register_hotplug_slot failed "
                                         "(err code = 0x%x)\n", retval);
                         goto err_exit;
                 }
         }
 
         newfunc->slot = slot;
         list_add_tail(&newfunc->sibling, &slot->funcs);
 
         /* associate corresponding pci_dev */
         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
                                          PCI_DEVFN(device, function));
         if (newfunc->pci_dev) {
                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
         }
 
         if (is_dock_device(handle)) {
                 /* we don't want to call this device's _EJ0
                  * because we want the dock notify handler
                  * to call it after it calls _DCK
                  */
                 newfunc->flags &= ~FUNC_HAS_EJ0;
                 if (register_hotplug_dock_device(handle,
                         &acpiphp_dock_ops, newfunc))
                         dbg("failed to register dock device\n");
 
                 /* we need to be notified when dock events happen
                  * outside of the hotplug operation, since we may
                  * need to do fixups before we can hotplug.
                  */
                 newfunc->nb.notifier_call = post_dock_fixups;
                 if (register_dock_notifier(&newfunc->nb))
                         dbg("failed to register a dock notifier");
         }
 
         /* install notify handler */
         if (!(newfunc->flags & FUNC_HAS_DCK)) {
                 status = acpi_install_notify_handler(handle,
                                              ACPI_SYSTEM_NOTIFY,
                                              handle_hotplug_event_func,
                                              newfunc);
 
                 if (ACPI_FAILURE(status))
                         err("failed to register interrupt notify handler\n");
         } else
                 status = AE_OK;
 
         return status;
 
  err_exit:
         bridge->nr_slots--;
         bridge->slots = slot->next;
         kfree(slot);
         kfree(newfunc);
 
         return AE_OK;
 }
 
 
 /* see if it's worth looking at this bridge */
 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 {
         acpi_status status;
         int count;
 
         count = 0;
 
         /* only check slots defined directly below bridge object */
         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
                                      is_ejectable_slot, (void *)&count, NULL);
 
         /*
          * we also need to add this bridge if there is a dock bridge or
          * other pci device on a dock station (removable)
          */
         if (!count)
                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
                                 (u32)1, is_pci_dock_device, (void *)&count,
                                 NULL);
 
         return count;
 }
 
 
 /* decode ACPI 2.0 _HPP hot plug parameters */
 static void decode_hpp(struct acpiphp_bridge *bridge)
 {
         acpi_status status;
 
         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
         if (ACPI_FAILURE(status) ||
             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
                 /* use default numbers */
                 printk(KERN_WARNING
                        "%s: Could not get hotplug parameters. Use defaults\n",
                        __func__);
                 bridge->hpp.t0 = &bridge->hpp.type0_data;
                 bridge->hpp.t0->revision = 0;
                 bridge->hpp.t0->cache_line_size = 0x10;
                 bridge->hpp.t0->latency_timer = 0x40;
                 bridge->hpp.t0->enable_serr = 0;
                 bridge->hpp.t0->enable_perr = 0;
         }
 }
 
 
 
 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 {
         acpi_status status;
 
         /* decode ACPI 2.0 _HPP (hot plug parameters) */
         decode_hpp(bridge);
 
         /* must be added to the list prior to calling register_slot */
         list_add(&bridge->list, &bridge_list);
 
         /* register all slot objects under this bridge */
         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
                                      register_slot, bridge, NULL);
         if (ACPI_FAILURE(status)) {
                 list_del(&bridge->list);
                 return;
         }
 
         /* install notify handler */
         if (bridge->type != BRIDGE_TYPE_HOST) {
                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
                         status = acpi_remove_notify_handler(bridge->func->handle,
                                                 ACPI_SYSTEM_NOTIFY,
                                                 handle_hotplug_event_func);
                         if (ACPI_FAILURE(status))
                                 err("failed to remove notify handler\n");
                 }
                 status = acpi_install_notify_handler(bridge->handle,
                                              ACPI_SYSTEM_NOTIFY,
                                              handle_hotplug_event_bridge,
                                              bridge);
 
                 if (ACPI_FAILURE(status)) {
                         err("failed to register interrupt notify handler\n");
                 }
         }
 }
 
 
 /* find acpiphp_func from acpiphp_bridge */
 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
 {
         struct list_head *node, *l;
         struct acpiphp_bridge *bridge;
         struct acpiphp_slot *slot;
         struct acpiphp_func *func;
 
         list_for_each(node, &bridge_list) {
                 bridge = list_entry(node, struct acpiphp_bridge, list);
                 for (slot = bridge->slots; slot; slot = slot->next) {
                         list_for_each(l, &slot->funcs) {
                                 func = list_entry(l, struct acpiphp_func,
                                                         sibling);
                                 if (func->handle == handle)
                                         return func;
                         }
                 }
         }
 
         return NULL;
 }
 
 
 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 {
         acpi_handle dummy_handle;
 
         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
                                         "_STA", &dummy_handle)))
                 bridge->flags |= BRIDGE_HAS_STA;
 
         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
                                         "_EJ0", &dummy_handle)))
                 bridge->flags |= BRIDGE_HAS_EJ0;
 
         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
                                         "_PS0", &dummy_handle)))
                 bridge->flags |= BRIDGE_HAS_PS0;
 
         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
                                         "_PS3", &dummy_handle)))
                 bridge->flags |= BRIDGE_HAS_PS3;
 
         /* is this ejectable p2p bridge? */
         if (bridge->flags & BRIDGE_HAS_EJ0) {
                 struct acpiphp_func *func;
 
                 dbg("found ejectable p2p bridge\n");
 
                 /* make link between PCI bridge and PCI function */
                 func = acpiphp_bridge_handle_to_function(bridge->handle);
                 if (!func)
                         return;
                 bridge->func = func;
                 func->bridge = bridge;
         }
 }
 
 
 /* allocate and initialize host bridge data structure */
 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 {
         struct acpiphp_bridge *bridge;
 
         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
         if (bridge == NULL)
                 return;
 
         bridge->type = BRIDGE_TYPE_HOST;
         bridge->handle = handle;
 
         bridge->pci_bus = pci_bus;
 
         spin_lock_init(&bridge->res_lock);
 
         init_bridge_misc(bridge);
 }
 
 
 /* allocate and initialize PCI-to-PCI bridge data structure */
 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 {
         struct acpiphp_bridge *bridge;
 
         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
         if (bridge == NULL) {
                 err("out of memory\n");
                 return;
         }
 
         bridge->type = BRIDGE_TYPE_P2P;
         bridge->handle = handle;
         config_p2p_bridge_flags(bridge);
 
         bridge->pci_dev = pci_dev_get(pci_dev);
         bridge->pci_bus = pci_dev->subordinate;
         if (!bridge->pci_bus) {
                 err("This is not a PCI-to-PCI bridge!\n");
                 goto err;
         }
 
         spin_lock_init(&bridge->res_lock);
 
         init_bridge_misc(bridge);
         return;
  err:
         pci_dev_put(pci_dev);
         kfree(bridge);
         return;
 }
 
 
 /* callback routine to find P2P bridges */
 static acpi_status
 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
         acpi_status status;
         acpi_handle dummy_handle;
         unsigned long long tmp;
         int device, function;
         struct pci_dev *dev;
         struct pci_bus *pci_bus = context;
 
         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
         if (ACPI_FAILURE(status))
                 return AE_OK;                /* continue */
 
         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
         if (ACPI_FAILURE(status)) {
                 dbg("%s: _ADR evaluation failure\n", __func__);
                 return AE_OK;
         }
 
         device = (tmp >> 16) & 0xffff;
         function = tmp & 0xffff;
 
         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 
         if (!dev || !dev->subordinate)
                 goto out;
 
         /* check if this bridge has ejectable slots */
         if ((detect_ejectable_slots(handle) > 0)) {
                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
                 add_p2p_bridge(handle, dev);
         }
 
         /* search P2P bridges under this p2p bridge */
         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
                                      find_p2p_bridge, dev->subordinate, NULL);
         if (ACPI_FAILURE(status))
                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 
  out:
         pci_dev_put(dev);
         return AE_OK;
 }
 
 
 /* find hot-pluggable slots, and then find P2P bridge */
 static int add_bridge(acpi_handle handle)
 {
         acpi_status status;
         unsigned long long tmp;
         int seg, bus;
         acpi_handle dummy_handle;
         struct pci_bus *pci_bus;
 
         /* if the bridge doesn't have _STA, we assume it is always there */
         status = acpi_get_handle(handle, "_STA", &dummy_handle);
         if (ACPI_SUCCESS(status)) {
                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
                 if (ACPI_FAILURE(status)) {
                         dbg("%s: _STA evaluation failure\n", __func__);
                         return 0;
                 }
                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
                         /* don't register this object */
                         return 0;
         }
 
         /* get PCI segment number */
         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 
         seg = ACPI_SUCCESS(status) ? tmp : 0;
 
         /* get PCI bus number */
         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 
         if (ACPI_SUCCESS(status)) {
                 bus = tmp;
         } else {
                 warn("can't get bus number, assuming 0\n");
                 bus = 0;
         }
 
         pci_bus = pci_find_bus(seg, bus);
         if (!pci_bus) {
                 err("Can't find bus %04x:%02x\n", seg, bus);
                 return 0;
         }
 
         /* check if this bridge has ejectable slots */
         if (detect_ejectable_slots(handle) > 0) {
                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
                 add_host_bridge(handle, pci_bus);
         }
 
         /* search P2P bridges under this host bridge */
         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
                                      find_p2p_bridge, pci_bus, NULL);
 
         if (ACPI_FAILURE(status))
                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
 
         return 0;
 }
 
 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 {
         struct list_head *head;
         list_for_each(head, &bridge_list) {
                 struct acpiphp_bridge *bridge = list_entry(head,
                                                 struct acpiphp_bridge, list);
                 if (bridge->handle == handle)
                         return bridge;
         }
 
         return NULL;
 }
 
 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 {
         struct list_head *list, *tmp;
         struct acpiphp_slot *slot;
         acpi_status status;
         acpi_handle handle = bridge->handle;
 
         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
                                             handle_hotplug_event_bridge);
         if (ACPI_FAILURE(status))
                 err("failed to remove notify handler\n");
 
         if ((bridge->type != BRIDGE_TYPE_HOST) &&
             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
                 status = acpi_install_notify_handler(bridge->func->handle,
                                                 ACPI_SYSTEM_NOTIFY,
                                                 handle_hotplug_event_func,
                                                 bridge->func);
                 if (ACPI_FAILURE(status))
                         err("failed to install interrupt notify handler\n");
         }
 
         slot = bridge->slots;
         while (slot) {
                 struct acpiphp_slot *next = slot->next;
                 list_for_each_safe (list, tmp, &slot->funcs) {
                         struct acpiphp_func *func;
                         func = list_entry(list, struct acpiphp_func, sibling);
                         if (is_dock_device(func->handle)) {
                                 unregister_hotplug_dock_device(func->handle);
                                 unregister_dock_notifier(&func->nb);
                         }
                         if (!(func->flags & FUNC_HAS_DCK)) {
                                 status = acpi_remove_notify_handler(func->handle,
                                                 ACPI_SYSTEM_NOTIFY,
                                                 handle_hotplug_event_func);
                                 if (ACPI_FAILURE(status))
                                         err("failed to remove notify handler\n");
                         }
                         pci_dev_put(func->pci_dev);
                         list_del(list);
                         kfree(func);
                 }
                 acpiphp_unregister_hotplug_slot(slot);
                 list_del(&slot->funcs);
                 kfree(slot);
                 slot = next;
         }
 
         pci_dev_put(bridge->pci_dev);
         list_del(&bridge->list);
         kfree(bridge);
 }
 
 static acpi_status
 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
         struct acpiphp_bridge *bridge;
 
         /* cleanup p2p bridges under this P2P bridge
            in a depth-first manner */
         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
                                 cleanup_p2p_bridge, NULL, NULL);
 
         bridge = acpiphp_handle_to_bridge(handle);
         if (bridge)
                 cleanup_bridge(bridge);
 
         return AE_OK;
 }
 
 static void remove_bridge(acpi_handle handle)
 {
         struct acpiphp_bridge *bridge;
 
         /* cleanup p2p bridges under this host bridge
            in a depth-first manner */
         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 
         /*
          * On root bridges with hotplug slots directly underneath (ie,
          * no p2p bridge inbetween), we call cleanup_bridge(). 
          *
          * The else clause cleans up root bridges that either had no
          * hotplug slots at all, or had a p2p bridge underneath.
          */
         bridge = acpiphp_handle_to_bridge(handle);
         if (bridge)
                 cleanup_bridge(bridge);
         else
                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
                                            handle_hotplug_event_bridge);
 }
 
 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 {
         struct acpi_pci_id id;
         struct pci_bus *bus;
         struct pci_dev *dev;
 
         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
                 return NULL;
 
         bus = pci_find_bus(id.segment, id.bus);
         if (!bus)
                 return NULL;
 
         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
         if (!dev)
                 return NULL;
 
         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
         {
                 pci_dev_put(dev);
                 return NULL;
         }
 
         return dev;
 }
 
 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 {
         acpi_status status;
         int result = -1;
         unsigned long long gsb;
         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
         union acpi_object *obj;
         void *table;
 
         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
         if (ACPI_SUCCESS(status)) {
                 *gsi_base = (u32)gsb;
                 return 0;
         }
 
         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
                 return -1;
 
         obj = buffer.pointer;
         if (obj->type != ACPI_TYPE_BUFFER)
                 goto out;
 
         table = obj->buffer.pointer;
         switch (((struct acpi_subtable_header *)table)->type) {
         case ACPI_MADT_TYPE_IO_SAPIC:
                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
                 result = 0;
                 break;
         case ACPI_MADT_TYPE_IO_APIC:
                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
                 result = 0;
                 break;
         default:
                 break;
         }
  out:
         kfree(buffer.pointer);
         return result;
 }
 
 static acpi_status
 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
         acpi_status status;
         unsigned long long sta;
         acpi_handle tmp;
         struct pci_dev *pdev;
         u32 gsi_base;
         u64 phys_addr;
         struct acpiphp_ioapic *ioapic;
 
         /* Evaluate _STA if present */
         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
                 return AE_CTRL_DEPTH;
 
         /* Scan only PCI bus scope */
         status = acpi_get_handle(handle, "_HID", &tmp);
         if (ACPI_SUCCESS(status))
                 return AE_CTRL_DEPTH;
 
         if (get_gsi_base(handle, &gsi_base))
                 return AE_OK;
 
         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
         if (!ioapic)
                 return AE_NO_MEMORY;
 
         pdev = get_apic_pci_info(handle);
         if (!pdev)
                 goto exit_kfree;
 
         if (pci_enable_device(pdev))
                 goto exit_pci_dev_put;
 
         pci_set_master(pdev);
 
         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
                 goto exit_pci_disable_device;
 
         phys_addr = pci_resource_start(pdev, 0);
         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
                 goto exit_pci_release_region;
 
         ioapic->gsi_base = gsi_base;
         ioapic->dev = pdev;
         spin_lock(&ioapic_list_lock);
         list_add_tail(&ioapic->list, &ioapic_list);
         spin_unlock(&ioapic_list_lock);
 
         return AE_OK;
 
  exit_pci_release_region:
         pci_release_region(pdev, 0);
  exit_pci_disable_device:
         pci_disable_device(pdev);
  exit_pci_dev_put:
         pci_dev_put(pdev);
  exit_kfree:
         kfree(ioapic);
 
         return AE_OK;
 }
 
 static acpi_status
 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
         acpi_status status;
         unsigned long long sta;
         acpi_handle tmp;
         u32 gsi_base;
         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
 
         /* Evaluate _STA if present */
         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
                 return AE_CTRL_DEPTH;
 
         /* Scan only PCI bus scope */
         status = acpi_get_handle(handle, "_HID", &tmp);
         if (ACPI_SUCCESS(status))
                 return AE_CTRL_DEPTH;
 
         if (get_gsi_base(handle, &gsi_base))
                 return AE_OK;
 
         acpi_unregister_ioapic(handle, gsi_base);
 
         spin_lock(&ioapic_list_lock);
         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
                 if (pos->gsi_base != gsi_base)
                         continue;
                 ioapic = pos;
                 list_del(&ioapic->list);
                 break;
         }
         spin_unlock(&ioapic_list_lock);
 
         if (!ioapic)
                 return AE_OK;
 
         pci_release_region(ioapic->dev, 0);
         pci_disable_device(ioapic->dev);
         pci_dev_put(ioapic->dev);
         kfree(ioapic);
 
         return AE_OK;
 }
 
 static int acpiphp_configure_ioapics(acpi_handle handle)
 {
         ioapic_add(handle, 0, NULL, NULL);
         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
         return 0;
 }
 
 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
 {
         ioapic_remove(handle, 0, NULL, NULL);
         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
         return 0;
 }
 
 static int power_on_slot(struct acpiphp_slot *slot)
 {
         acpi_status status;
         struct acpiphp_func *func;
         struct list_head *l;
         int retval = 0;
 
         /* if already enabled, just skip */
         if (slot->flags & SLOT_POWEREDON)
                 goto err_exit;
 
         list_for_each (l, &slot->funcs) {
                 func = list_entry(l, struct acpiphp_func, sibling);
 
                 if (func->flags & FUNC_HAS_PS0) {
                         dbg("%s: executing _PS0\n", __func__);
                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
                         if (ACPI_FAILURE(status)) {
                                 warn("%s: _PS0 failed\n", __func__);
                                 retval = -1;
                                 goto err_exit;
                         } else
                                 break;
                 }
         }
 
         /* TBD: evaluate _STA to check if the slot is enabled */
 
         slot->flags |= SLOT_POWEREDON;
 
  err_exit:
         return retval;
 }
 
 
 static int power_off_slot(struct acpiphp_slot *slot)
 {
         acpi_status status;
         struct acpiphp_func *func;
         struct list_head *l;
 
         int retval = 0;
 
         /* if already disabled, just skip */
         if ((slot->flags & SLOT_POWEREDON) == 0)
                 goto err_exit;
 
         list_for_each (l, &slot->funcs) {
                 func = list_entry(l, struct acpiphp_func, sibling);
 
                 if (func->flags & FUNC_HAS_PS3) {
                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
                         if (ACPI_FAILURE(status)) {
                                 warn("%s: _PS3 failed\n", __func__);
                                 retval = -1;
                                 goto err_exit;
                         } else
                                 break;
                 }
         }
 
         /* TBD: evaluate _STA to check if the slot is disabled */
 
         slot->flags &= (~SLOT_POWEREDON);
 
  err_exit:
        return retval;
}



/**
 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
 * @bus: bus to start search with
 */
static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
{
        struct list_head *tmp;
        unsigned char max, n;

        /*
         * pci_bus_max_busnr will return the highest
         * reserved busnr for all these children.
         * that is equivalent to the bus->subordinate
         * value.  We don't want to use the parent's
         * bus->subordinate value because it could have
         * padding in it.
         */
        max = bus->secondary;

        list_for_each(tmp, &bus->children) {
                n = pci_bus_max_busnr(pci_bus_b(tmp));
                if (n > max)
                        max = n;
        }
        return max;
}


/**
 * acpiphp_bus_add - add a new bus to acpi subsystem
 * @func: acpiphp_func of the bridge
 */
static int acpiphp_bus_add(struct acpiphp_func *func)
{
        acpi_handle phandle;
        struct acpi_device *device, *pdevice;
        int ret_val;

        acpi_get_parent(func->handle, &phandle);
        if (acpi_bus_get_device(phandle, &pdevice)) {
                dbg("no parent device, assuming NULL\n");
                pdevice = NULL;
        }
        if (!acpi_bus_get_device(func->handle, &device)) {
                dbg("bus exists... trim\n");
                /* this shouldn't be in here, so remove
                 * the bus then re-add it...
                 */
                ret_val = acpi_bus_trim(device, 1);
                dbg("acpi_bus_trim return %x\n", ret_val);
        }

        ret_val = acpi_bus_add(&device, pdevice, func->handle,
                ACPI_BUS_TYPE_DEVICE);
        if (ret_val) {
                dbg("error adding bus, %x\n",
                        -ret_val);
                goto acpiphp_bus_add_out;
        }
        /*
         * try to start anyway.  We could have failed to add
         * simply because this bus had previously been added
         * on another add.  Don't bother with the return value
         * we just keep going.
         */
        ret_val = acpi_bus_start(device);

acpiphp_bus_add_out:
        return ret_val;
}


/**
 * acpiphp_bus_trim - trim a bus from acpi subsystem
 * @handle: handle to acpi namespace
 */
static int acpiphp_bus_trim(acpi_handle handle)
{
        struct acpi_device *device;
        int retval;

        retval = acpi_bus_get_device(handle, &device);
        if (retval) {
                dbg("acpi_device not found\n");
                return retval;
        }

        retval = acpi_bus_trim(device, 1);
        if (retval)
                err("cannot remove from acpi list\n");

        return retval;
}

/**
 * enable_device - enable, configure a slot
 * @slot: slot to be enabled
 *
 * This function should be called per *physical slot*,
 * not per each slot object in ACPI namespace.
 */
static int __ref enable_device(struct acpiphp_slot *slot)
{
        struct pci_dev *dev;
        struct pci_bus *bus = slot->bridge->pci_bus;
        struct list_head *l;
        struct acpiphp_func *func;
        int retval = 0;
        int num, max, pass;
        acpi_status status;

        if (slot->flags & SLOT_ENABLED)
                goto err_exit;

        /* sanity check: dev should be NULL when hot-plugged in */
        dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
        if (dev) {
                /* This case shouldn't happen */
                err("pci_dev structure already exists.\n");
                pci_dev_put(dev);
                retval = -1;
                goto err_exit;
        }

        num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
        if (num == 0) {
                err("No new device found\n");
                retval = -1;
                goto err_exit;
        }

        max = acpiphp_max_busnr(bus);
        for (pass = 0; pass < 2; pass++) {
                list_for_each_entry(dev, &bus->devices, bus_list) {
                        if (PCI_SLOT(dev->devfn) != slot->device)
                                continue;
                        if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
                            dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
                                max = pci_scan_bridge(bus, dev, max, pass);
                                if (pass && dev->subordinate)
                                        pci_bus_size_bridges(dev->subordinate);
                        }
                }
        }

        list_for_each (l, &slot->funcs) {
                func = list_entry(l, struct acpiphp_func, sibling);
                acpiphp_bus_add(func);
        }

        pci_bus_assign_resources(bus);
        acpiphp_sanitize_bus(bus);
        acpiphp_set_hpp_values(slot->bridge->handle, bus);
        list_for_each_entry(func, &slot->funcs, sibling)
                acpiphp_configure_ioapics(func->handle);
        pci_enable_bridges(bus);
        pci_bus_add_devices(bus);

        /* associate pci_dev to our representation */
        list_for_each (l, &slot->funcs) {
                func = list_entry(l, struct acpiphp_func, sibling);
                func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
                                                        func->function));
                if (!func->pci_dev)
                        continue;

                if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
                    func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
                        continue;

                status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
                if (ACPI_FAILURE(status))
                        warn("find_p2p_bridge failed (error code = 0x%x)\n",
                                status);
        }

        slot->flags |= SLOT_ENABLED;

 err_exit:
        return retval;
}

static void disable_bridges(struct pci_bus *bus)
{
        struct pci_dev *dev;
        list_for_each_entry(dev, &bus->devices, bus_list) {
                if (dev->subordinate) {
                        disable_bridges(dev->subordinate);
                        pci_disable_device(dev);
                }
        }
}

/**
 * disable_device - disable a slot
 * @slot: ACPI PHP slot
 */
static int disable_device(struct acpiphp_slot *slot)
{
        int retval = 0;
        struct acpiphp_func *func;
        struct list_head *l;

        /* is this slot already disabled? */
        if (!(slot->flags & SLOT_ENABLED))
                goto err_exit;

        list_for_each (l, &slot->funcs) {
                func = list_entry(l, struct acpiphp_func, sibling);

                if (func->bridge) {
                        /* cleanup p2p bridges under this P2P bridge */
                        cleanup_p2p_bridge(func->bridge->handle,
                                                (u32)1, NULL, NULL);
                        func->bridge = NULL;
                }

                if (func->pci_dev) {
                        pci_stop_bus_device(func->pci_dev);
                        if (func->pci_dev->subordinate) {
                                disable_bridges(func->pci_dev->subordinate);
                                pci_disable_device(func->pci_dev);
                        }
                }
        }

        list_for_each (l, &slot->funcs) {
                func = list_entry(l, struct acpiphp_func, sibling);

                acpiphp_unconfigure_ioapics(func->handle);
                acpiphp_bus_trim(func->handle);
                /* try to remove anyway.
                 * acpiphp_bus_add might have been failed */

                if (!func->pci_dev)
                        continue;

                pci_remove_bus_device(func->pci_dev);
                pci_dev_put(func->pci_dev);
                func->pci_dev = NULL;
        }

        slot->flags &= (~SLOT_ENABLED);

 err_exit:
        return retval;
}


/**
 * get_slot_status - get ACPI slot status
 * @slot: ACPI PHP slot
 *
 * If a slot has _STA for each function and if any one of them
 * returned non-zero status, return it.
 *
 * If a slot doesn't have _STA and if any one of its functions'
 * configuration space is configured, return 0x0f as a _STA.
 *
 * Otherwise return 0.
 */
static unsigned int get_slot_status(struct acpiphp_slot *slot)
{
        acpi_status status;
        unsigned long long sta = 0;
        u32 dvid;
        struct list_head *l;
        struct acpiphp_func *func;

        list_for_each (l, &slot->funcs) {
                func = list_entry(l, struct acpiphp_func, sibling);

                if (func->flags & FUNC_HAS_STA) {
                        status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
                        if (ACPI_SUCCESS(status) && sta)
                                break;
                } else {
                        pci_bus_read_config_dword(slot->bridge->pci_bus,
                                                  PCI_DEVFN(slot->device,
                                                            func->function),
                                                  PCI_VENDOR_ID, &dvid);
                        if (dvid != 0xffffffff) {
                                sta = ACPI_STA_ALL;
                                break;
                        }
                }
        }

        return (unsigned int)sta;
}

/**
 * acpiphp_eject_slot - physically eject the slot
 * @slot: ACPI PHP slot
 */
int acpiphp_eject_slot(struct acpiphp_slot *slot)
{
        acpi_status status;
        struct acpiphp_func *func;
        struct list_head *l;
        struct acpi_object_list arg_list;
        union acpi_object arg;

        list_for_each (l, &slot->funcs) {
                func = list_entry(l, struct acpiphp_func, sibling);

                /* We don't want to call _EJ0 on non-existing functions. */
                if ((func->flags & FUNC_HAS_EJ0)) {
                        /* _EJ0 method take one argument */
                        arg_list.count = 1;
                        arg_list.pointer = &arg;
                        arg.type = ACPI_TYPE_INTEGER;
                        arg.integer.value = 1;

                        status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
                        if (ACPI_FAILURE(status)) {
                                warn("%s: _EJ0 failed\n", __func__);
                                return -1;
                        } else
                                break;
                }
        }
        return 0;
}

/**
 * acpiphp_check_bridge - re-enumerate devices
 * @bridge: where to begin re-enumeration
 *
 * Iterate over all slots under this bridge and make sure that if a
 * card is present they are enabled, and if not they are disabled.
 */
static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
{
        struct acpiphp_slot *slot;
        int retval = 0;
        int enabled, disabled;

        enabled = disabled = 0;

        for (slot = bridge->slots; slot; slot = slot->next) {
                unsigned int status = get_slot_status(slot);
                if (slot->flags & SLOT_ENABLED) {
                        if (status == ACPI_STA_ALL)
                                continue;
                        retval = acpiphp_disable_slot(slot);
                        if (retval) {
                                err("Error occurred in disabling\n");
                                goto err_exit;
                        } else {
                                acpiphp_eject_slot(slot);
                        }
                        disabled++;
                } else {
                        if (status != ACPI_STA_ALL)
                                continue;
                        retval = acpiphp_enable_slot(slot);
                        if (retval) {
                                err("Error occurred in enabling\n");
                                goto err_exit;
                        }
                        enabled++;
                }
        }

        dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);

 err_exit:
        return retval;
}

static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
{
        u16 pci_cmd, pci_bctl;
        struct pci_dev *cdev;

        /* Program hpp values for this device */
        if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
                        (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
                        (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
                return;

        if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
                return;

        pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
                        bridge->hpp.t0->cache_line_size);
        pci_write_config_byte(dev, PCI_LATENCY_TIMER,
                        bridge->hpp.t0->latency_timer);
        pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
        if (bridge->hpp.t0->enable_serr)
                pci_cmd |= PCI_COMMAND_SERR;
        else
                pci_cmd &= ~PCI_COMMAND_SERR;
        if (bridge->hpp.t0->enable_perr)
                pci_cmd |= PCI_COMMAND_PARITY;
        else
                pci_cmd &= ~PCI_COMMAND_PARITY;
        pci_write_config_word(dev, PCI_COMMAND, pci_cmd);

        /* Program bridge control value and child devices */
        if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
                pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
                                bridge->hpp.t0->latency_timer);
                pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
                if (bridge->hpp.t0->enable_serr)
                        pci_bctl |= PCI_BRIDGE_CTL_SERR;
                else
                        pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
                if (bridge->hpp.t0->enable_perr)
                        pci_bctl |= PCI_BRIDGE_CTL_PARITY;
                else
                        pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
                pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
                if (dev->subordinate) {
                        list_for_each_entry(cdev, &dev->subordinate->devices,
                                        bus_list)
                                program_hpp(cdev, bridge);
                }
        }
}

static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
{
        struct acpiphp_bridge bridge;
        struct pci_dev *dev;

        memset(&bridge, 0, sizeof(bridge));
        bridge.handle = handle;
        bridge.pci_bus = bus;
        bridge.pci_dev = bus->self;
        decode_hpp(&bridge);
        list_for_each_entry(dev, &bus->devices, bus_list)
                program_hpp(dev, &bridge);

}

/*
 * Remove devices for which we could not assign resources, call
 * arch specific code to fix-up the bus
 */
static void acpiphp_sanitize_bus(struct pci_bus *bus)
{
        struct pci_dev *dev;
        int i;
        unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;

        list_for_each_entry(dev, &bus->devices, bus_list) {
                for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
                        struct resource *res = &dev->resource[i];
                        if ((res->flags & type_mask) && !res->start &&
                                        res->end) {
                                /* Could not assign a required resources
                                 * for this device, remove it */
                                pci_remove_bus_device(dev);
                                break;
                        }
                }
        }
}

/* Program resources in newly inserted bridge */
static int acpiphp_configure_bridge (acpi_handle handle)
{
        struct acpi_pci_id pci_id;
        struct pci_bus *bus;

        if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
                err("cannot get PCI domain and bus number for bridge\n");
                return -EINVAL;
        }
        bus = pci_find_bus(pci_id.segment, pci_id.bus);
        if (!bus) {
                err("cannot find bus %d:%d\n",
                                pci_id.segment, pci_id.bus);
                return -EINVAL;
        }

        pci_bus_size_bridges(bus);
        pci_bus_assign_resources(bus);
        acpiphp_sanitize_bus(bus);
        acpiphp_set_hpp_values(handle, bus);
        pci_enable_bridges(bus);
        acpiphp_configure_ioapics(handle);
        return 0;
}

static void handle_bridge_insertion(acpi_handle handle, u32 type)
{
        struct acpi_device *device, *pdevice;
        acpi_handle phandle;

        if ((type != ACPI_NOTIFY_BUS_CHECK) &&
                        (type != ACPI_NOTIFY_DEVICE_CHECK)) {
                err("unexpected notification type %d\n", type);
                return;
        }

        acpi_get_parent(handle, &phandle);
        if (acpi_bus_get_device(phandle, &pdevice)) {
                dbg("no parent device, assuming NULL\n");
                pdevice = NULL;
        }
        if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
                err("cannot add bridge to acpi list\n");
                return;
        }
        if (!acpiphp_configure_bridge(handle) &&
                !acpi_bus_start(device))
                add_bridge(handle);
        else
                err("cannot configure and start bridge\n");

}

/*
 * ACPI event handlers
 */

static acpi_status
count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
        int *count = (int *)context;
        struct acpiphp_bridge *bridge;

        bridge = acpiphp_handle_to_bridge(handle);
        if (bridge)
                (*count)++;
        return AE_OK ;
}

static acpi_status
check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
        struct acpiphp_bridge *bridge;
        char objname[64];
        struct acpi_buffer buffer = { .length = sizeof(objname),
                                      .pointer = objname };

        bridge = acpiphp_handle_to_bridge(handle);
        if (bridge) {
                acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
                dbg("%s: re-enumerating slots under %s\n",
                        __func__, objname);
                acpiphp_check_bridge(bridge);
        }
        return AE_OK ;
}

/**
 * handle_hotplug_event_bridge - handle ACPI event on bridges
 * @handle: Notify()'ed acpi_handle
 * @type: Notify code
 * @context: pointer to acpiphp_bridge structure
 *
 * Handles ACPI event notification on {host,p2p} bridges.
 */
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
{
        struct acpiphp_bridge *bridge;
        char objname[64];
        struct acpi_buffer buffer = { .length = sizeof(objname),
                                      .pointer = objname };
        struct acpi_device *device;
        int num_sub_bridges = 0;

        if (acpi_bus_get_device(handle, &device)) {
                /* This bridge must have just been physically inserted */
                handle_bridge_insertion(handle, type);
                return;
        }

        bridge = acpiphp_handle_to_bridge(handle);
        if (type == ACPI_NOTIFY_BUS_CHECK) {
                acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
                        count_sub_bridges, &num_sub_bridges, NULL);
        }

        if (!bridge && !num_sub_bridges) {
                err("cannot get bridge info\n");
                return;
        }

        acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

        switch (type) {
        case ACPI_NOTIFY_BUS_CHECK:
                /* bus re-enumerate */
                dbg("%s: Bus check notify on %s\n", __func__, objname);
                if (bridge) {
                        dbg("%s: re-enumerating slots under %s\n",
                                __func__, objname);
                        acpiphp_check_bridge(bridge);
                }
                if (num_sub_bridges)
                        acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
                                ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
                break;

        case ACPI_NOTIFY_DEVICE_CHECK:
                /* device check */
                dbg("%s: Device check notify on %s\n", __func__, objname);
                acpiphp_check_bridge(bridge);
                break;

        case ACPI_NOTIFY_DEVICE_WAKE:
                /* wake event */
                dbg("%s: Device wake notify on %s\n", __func__, objname);
                break;

        case ACPI_NOTIFY_EJECT_REQUEST:
                /* request device eject */
                dbg("%s: Device eject notify on %s\n", __func__, objname);
                if ((bridge->type != BRIDGE_TYPE_HOST) &&
                    (bridge->flags & BRIDGE_HAS_EJ0)) {
                        struct acpiphp_slot *slot;
                        slot = bridge->func->slot;
                        if (!acpiphp_disable_slot(slot))
                                acpiphp_eject_slot(slot);
                }
                break;

        case ACPI_NOTIFY_FREQUENCY_MISMATCH:
                printk(KERN_ERR "Device %s cannot be configured due"
                                " to a frequency mismatch\n", objname);
                break;

        case ACPI_NOTIFY_BUS_MODE_MISMATCH:
                printk(KERN_ERR "Device %s cannot be configured due"
                                " to a bus mode mismatch\n", objname);
                break;

        case ACPI_NOTIFY_POWER_FAULT:
                printk(KERN_ERR "Device %s has suffered a power fault\n",
                                objname);
                break;

        default:
                warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
                break;
        }
}

/**
 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
 * @handle: Notify()'ed acpi_handle
 * @type: Notify code
 * @context: pointer to acpiphp_func structure
 *
 * Handles ACPI event notification on slots.
 */
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
{
        struct acpiphp_func *func;
        char objname[64];
        struct acpi_buffer buffer = { .length = sizeof(objname),
                                      .pointer = objname };

        acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

        func = (struct acpiphp_func *)context;

        switch (type) {
        case ACPI_NOTIFY_BUS_CHECK:
                /* bus re-enumerate */
                dbg("%s: Bus check notify on %s\n", __func__, objname);
                acpiphp_enable_slot(func->slot);
                break;

        case ACPI_NOTIFY_DEVICE_CHECK:
                /* device check : re-enumerate from parent bus */
                dbg("%s: Device check notify on %s\n", __func__, objname);
                acpiphp_check_bridge(func->slot->bridge);
                break;

        case ACPI_NOTIFY_DEVICE_WAKE:
                /* wake event */
                dbg("%s: Device wake notify on %s\n", __func__, objname);
                break;

        case ACPI_NOTIFY_EJECT_REQUEST:
                /* request device eject */
                dbg("%s: Device eject notify on %s\n", __func__, objname);
                if (!(acpiphp_disable_slot(func->slot)))
                        acpiphp_eject_slot(func->slot);
                break;

        default:
                warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
                break;
        }
}


static acpi_status
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
        int *count = (int *)context;

        if (acpi_root_bridge(handle)) {
                acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
                                handle_hotplug_event_bridge, NULL);
                        (*count)++;
        }
        return AE_OK ;
}

static struct acpi_pci_driver acpi_pci_hp_driver = {
        .add =                add_bridge,
        .remove =        remove_bridge,
};

/**
 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
 */
int __init acpiphp_glue_init(void)
{
        int num = 0;

        acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
                        ACPI_UINT32_MAX, find_root_bridges, &num, NULL);

        if (num <= 0)
                return -1;
        else
                acpi_pci_register_driver(&acpi_pci_hp_driver);

        return 0;
}


/**
 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
 *
 * This function frees all data allocated in acpiphp_glue_init().
 */
void  acpiphp_glue_exit(void)
{
        acpi_pci_unregister_driver(&acpi_pci_hp_driver);
}


/**
 * acpiphp_get_num_slots - count number of slots in a system
 */
int __init acpiphp_get_num_slots(void)
{
        struct acpiphp_bridge *bridge;
        int num_slots = 0;

        list_for_each_entry (bridge, &bridge_list, list) {
                dbg("Bus %04x:%02x has %d slot%s\n",
                                pci_domain_nr(bridge->pci_bus),
                                bridge->pci_bus->number, bridge->nr_slots,
                                bridge->nr_slots == 1 ? "" : "s");
                num_slots += bridge->nr_slots;
        }

        dbg("Total %d slots\n", num_slots);
        return num_slots;
}


#if 0
/**
 * acpiphp_for_each_slot - call function for each slot
 * @fn: callback function
 * @data: context to be passed to callback function
 */
static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
{
        struct list_head *node;
        struct acpiphp_bridge *bridge;
        struct acpiphp_slot *slot;
        int retval = 0;

        list_for_each (node, &bridge_list) {
                bridge = (struct acpiphp_bridge *)node;
                for (slot = bridge->slots; slot; slot = slot->next) {
                        retval = fn(slot, data);
                        if (!retval)
                                goto err_exit;
                }
        }

 err_exit:
        return retval;
}
#endif


/**
 * acpiphp_enable_slot - power on slot
 * @slot: ACPI PHP slot
 */
int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
        int retval;

        mutex_lock(&slot->crit_sect);

        /* wake up all functions */
        retval = power_on_slot(slot);
        if (retval)
                goto err_exit;

        if (get_slot_status(slot) == ACPI_STA_ALL) {
                /* configure all functions */
                retval = enable_device(slot);
                if (retval)
                        power_off_slot(slot);
        } else {
                dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
                power_off_slot(slot);
        }

 err_exit:
        mutex_unlock(&slot->crit_sect);
        return retval;
}

/**
 * acpiphp_disable_slot - power off slot
 * @slot: ACPI PHP slot
 */
int acpiphp_disable_slot(struct acpiphp_slot *slot)
{
        int retval = 0;

        mutex_lock(&slot->crit_sect);

        /* unconfigure all functions */
        retval = disable_device(slot);
        if (retval)
                goto err_exit;

        /* power off all functions */
        retval = power_off_slot(slot);
        if (retval)
                goto err_exit;

 err_exit:
        mutex_unlock(&slot->crit_sect);
        return retval;
}


/*
 * slot enabled:  1
 * slot disabled: 0
 */
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
{
        return (slot->flags & SLOT_POWEREDON);
}


/*
 * latch   open:  1
 * latch closed:  0
 */
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
{
        unsigned int sta;

        sta = get_slot_status(slot);

        return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
}


/*
 * adapter presence : 1
 *          absence : 0
 */
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
{
        unsigned int sta;

        sta = get_slot_status(slot);

        return (sta == 0) ? 0 : 1;
}