acpiphp_glue.c 40.7 KB
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/*
 * 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
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 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
 * Copyright (C) 2003-2005 Hewlett Packard
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 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
 * Copyright (C) 2005 Intel Corporation
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 *
 * 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 <t-kochi@bq.jp.nec.com>
 *
 */

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/*
 * 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.
 */

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#include <linux/init.h>
#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/smp_lock.h>
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#include <linux/mutex.h>
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#include "../pci.h"
#include "pci_hotplug.h"
#include "acpiphp.h"

static LIST_HEAD(bridge_list);

#define MY_NAME "acpiphp_glue"

static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
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static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);

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/*
 * 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 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;
	}
}

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/* callback routine to check for the existance 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;
}



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/* 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 adr, sun;
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	int device, function, retval;
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	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);

	if (ACPI_FAILURE(status))
		return AE_OK;

	status = acpi_get_handle(handle, "_EJ0", &tmp);

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	if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
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		return AE_OK;

	device = (adr >> 16) & 0xffff;
	function = adr & 0xffff;

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	newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
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	if (!newfunc)
		return AE_NO_MEMORY;

	INIT_LIST_HEAD(&newfunc->sibling);
	newfunc->handle = handle;
	newfunc->function = function;
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	if (ACPI_SUCCESS(status))
		newfunc->flags = FUNC_HAS_EJ0;
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	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;

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	if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
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		newfunc->flags |= FUNC_HAS_DCK;

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	status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
	if (ACPI_FAILURE(status))
		sun = -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) {
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		slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
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		if (!slot) {
			kfree(newfunc);
			return AE_NO_MEMORY;
		}

		slot->bridge = bridge;
		slot->device = device;
		slot->sun = sun;
		INIT_LIST_HEAD(&slot->funcs);
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		mutex_init(&slot->crit_sect);
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		slot->next = bridge->slots;
		bridge->slots = slot;

		bridge->nr_slots++;

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		dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
				slot->sun, pci_domain_nr(bridge->pci_bus),
				bridge->pci_bus->number, slot->device);
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		retval = acpiphp_register_hotplug_slot(slot);
		if (retval) {
			warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
			goto err_exit;
		}
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	}

	newfunc->slot = slot;
	list_add_tail(&newfunc->sibling, &slot->funcs);

	/* associate corresponding pci_dev */
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	newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
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					 PCI_DEVFN(device, function));
	if (newfunc->pci_dev) {
		slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
	}

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	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
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		 */
		newfunc->flags &= ~FUNC_HAS_EJ0;
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		if (register_hotplug_dock_device(handle,
			handle_hotplug_event_func, 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");
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	}

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	/* install notify handler */
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	if (!(newfunc->flags & FUNC_HAS_DCK)) {
		status = acpi_install_notify_handler(handle,
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					     ACPI_SYSTEM_NOTIFY,
					     handle_hotplug_event_func,
					     newfunc);

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		if (ACPI_FAILURE(status))
			err("failed to register interrupt notify handler\n");
	} else
		status = AE_OK;
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	return status;
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 err_exit:
	bridge->nr_slots--;
	bridge->slots = slot->next;
	kfree(slot);
	kfree(newfunc);

	return AE_OK;
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}


/* 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);

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	/*
	 * 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);

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	return count;
}


/* decode ACPI 2.0 _HPP hot plug parameters */
static void decode_hpp(struct acpiphp_bridge *bridge)
{
	acpi_status status;

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	status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
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	if (ACPI_FAILURE(status) ||
	    !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
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		/* use default numbers */
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		printk(KERN_WARNING
		       "%s: Could not get hotplug parameters. Use defaults\n",
		       __FUNCTION__);
		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;
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	}
}


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/* 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);

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	/* must be added to the list prior to calling register_slot */
	list_add(&bridge->list, &bridge_list);

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	/* register all slot objects under this bridge */
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
				     register_slot, bridge, NULL);
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	if (ACPI_FAILURE(status)) {
		list_del(&bridge->list);
		return;
	}
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	/* install notify handler */
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	if (bridge->type != BRIDGE_TYPE_HOST) {
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		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");
		}
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		status = acpi_install_notify_handler(bridge->handle,
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					     ACPI_SYSTEM_NOTIFY,
					     handle_hotplug_event_bridge,
					     bridge);

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		if (ACPI_FAILURE(status)) {
			err("failed to register interrupt notify handler\n");
		}
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	}
}


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/* 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;
	}
}


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/* allocate and initialize host bridge data structure */
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static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
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{
	struct acpiphp_bridge *bridge;

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	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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	if (bridge == NULL)
		return;

	bridge->type = BRIDGE_TYPE_HOST;
	bridge->handle = handle;

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	bridge->pci_bus = pci_bus;
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	spin_lock_init(&bridge->res_lock);

	init_bridge_misc(bridge);
}


/* allocate and initialize PCI-to-PCI bridge data structure */
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static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
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{
	struct acpiphp_bridge *bridge;

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	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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	if (bridge == NULL) {
		err("out of memory\n");
		return;
	}

	bridge->type = BRIDGE_TYPE_P2P;
	bridge->handle = handle;
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	config_p2p_bridge_flags(bridge);
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	bridge->pci_dev = pci_dev_get(pci_dev);
	bridge->pci_bus = pci_dev->subordinate;
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	if (!bridge->pci_bus) {
		err("This is not a PCI-to-PCI bridge!\n");
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		goto err;
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	}

	spin_lock_init(&bridge->res_lock);

	init_bridge_misc(bridge);
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	return;
 err:
	pci_dev_put(pci_dev);
	kfree(bridge);
	return;
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}


/* 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 tmp;
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	int device, function;
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	struct pci_dev *dev;
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	struct pci_bus *pci_bus = context;
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	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", __FUNCTION__);
		return AE_OK;
	}

	device = (tmp >> 16) & 0xffff;
	function = tmp & 0xffff;

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	dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
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	if (!dev || !dev->subordinate)
		goto out;
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	/* check if this bridge has ejectable slots */
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	if ((detect_ejectable_slots(handle) > 0)) {
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		dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
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		add_p2p_bridge(handle, dev);
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	}

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	/* 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))
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		warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
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 out:
	pci_dev_put(dev);
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	return AE_OK;
}


/* find hot-pluggable slots, and then find P2P bridge */
static int add_bridge(acpi_handle handle)
{
	acpi_status status;
	unsigned long tmp;
	int seg, bus;
	acpi_handle dummy_handle;
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	struct pci_bus *pci_bus;
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	/* 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", __FUNCTION__);
			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;
	}

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	pci_bus = pci_find_bus(seg, bus);
	if (!pci_bus) {
		err("Can't find bus %04x:%02x\n", seg, bus);
		return 0;
	}

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	/* check if this bridge has ejectable slots */
	if (detect_ejectable_slots(handle) > 0) {
		dbg("found PCI host-bus bridge with hot-pluggable slots\n");
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		add_host_bridge(handle, pci_bus);
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	}

	/* search P2P bridges under this host bridge */
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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				     find_p2p_bridge, pci_bus, NULL);
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	if (ACPI_FAILURE(status))
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		warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
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	return 0;
}

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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;
}
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static void cleanup_bridge(struct acpiphp_bridge *bridge)
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{
635 636 637
	struct list_head *list, *tmp;
	struct acpiphp_slot *slot;
	acpi_status status;
638
	acpi_handle handle = bridge->handle;
639 640 641 642 643 644

	status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					    handle_hotplug_event_bridge);
	if (ACPI_FAILURE(status))
		err("failed to remove notify handler\n");

645 646 647 648 649 650 651 652 653 654
	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");
	}

655 656 657 658 659 660
	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);
K
Kristen Accardi 已提交
661 662 663 664
			if (is_dock_device(func->handle)) {
				unregister_hotplug_dock_device(func->handle);
				unregister_dock_notifier(&func->nb);
			}
665 666
			if (!(func->flags & FUNC_HAS_DCK)) {
				status = acpi_remove_notify_handler(func->handle,
667 668
						ACPI_SYSTEM_NOTIFY,
						handle_hotplug_event_func);
669 670 671
				if (ACPI_FAILURE(status))
					err("failed to remove notify handler\n");
			}
672 673 674 675
			pci_dev_put(func->pci_dev);
			list_del(list);
			kfree(func);
		}
676 677
		acpiphp_unregister_hotplug_slot(slot);
		list_del(&slot->funcs);
678 679 680 681 682 683 684
		kfree(slot);
		slot = next;
	}

	pci_dev_put(bridge->pci_dev);
	list_del(&bridge->list);
	kfree(bridge);
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}

687 688 689 690 691
static acpi_status
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpiphp_bridge *bridge;

692 693 694 695 696
	/* 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);

697 698 699 700 701 702 703 704 705 706
	if (!(bridge = acpiphp_handle_to_bridge(handle)))
		return AE_OK;
	cleanup_bridge(bridge);
	return AE_OK;
}

static void remove_bridge(acpi_handle handle)
{
	struct acpiphp_bridge *bridge;

707 708 709 710 711
	/* 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);

712
	bridge = acpiphp_handle_to_bridge(handle);
713
	if (bridge)
714 715
		cleanup_bridge(bridge);
}
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717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
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 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 (((acpi_table_entry_header *)table)->type) {
	case ACPI_MADT_IOSAPIC:
		*gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base;
		result = 0;
		break;
	case ACPI_MADT_IOAPIC:
		*gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base;
		result = 0;
		break;
	default:
		break;
	}
 out:
781
	kfree(buffer.pointer);
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
	return result;
}

static acpi_status
ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	acpi_status status;
	unsigned long sta;
	acpi_handle tmp;
	struct pci_dev *pdev;
	u32 gsi_base;
	u64 phys_addr;

	/* 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;

	pdev = get_apic_pci_info(handle);
	if (!pdev)
		return AE_OK;

	if (pci_enable_device(pdev)) {
		pci_dev_put(pdev);
		return AE_OK;
	}

	pci_set_master(pdev);

	if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) {
		pci_disable_device(pdev);
		pci_dev_put(pdev);
		return AE_OK;
	}

	phys_addr = pci_resource_start(pdev, 0);
	if (acpi_register_ioapic(handle, phys_addr, gsi_base)) {
		pci_release_region(pdev, 0);
		pci_disable_device(pdev);
		pci_dev_put(pdev);
		return AE_OK;
	}

	return AE_OK;
}

static int acpiphp_configure_ioapics(acpi_handle handle)
{
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
			    ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
	return 0;
}

L
Linus Torvalds 已提交
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
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", __FUNCTION__);
			status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
			if (ACPI_FAILURE(status)) {
				warn("%s: _PS0 failed\n", __FUNCTION__);
				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);

893
		if (func->flags & FUNC_HAS_PS3) {
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			status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
			if (ACPI_FAILURE(status)) {
				warn("%s: _PS3 failed\n", __FUNCTION__);
				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;
}


913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959

/**
 * 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;
	}
960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
	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;
975 976 977 978 979 980 981 982 983 984 985 986 987 988
	}
	/*
	 * 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;
}


989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
/**
 * acpiphp_bus_trim - trim a bus from acpi subsystem
 * @handle: handle to acpi namespace
 *
 */
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;
}
1011

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/**
 * 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 enable_device(struct acpiphp_slot *slot)
{
	struct pci_dev *dev;
1023
	struct pci_bus *bus = slot->bridge->pci_bus;
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	struct list_head *l;
	struct acpiphp_func *func;
	int retval = 0;
1027
	int num, max, pass;
1028
	acpi_status status;
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	if (slot->flags & SLOT_ENABLED)
		goto err_exit;

	/* sanity check: dev should be NULL when hot-plugged in */
1034
	dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
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	if (dev) {
		/* This case shouldn't happen */
		err("pci_dev structure already exists.\n");
1038
		pci_dev_put(dev);
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		retval = -1;
		goto err_exit;
	}

1043 1044
	num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
	if (num == 0) {
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Linus Torvalds 已提交
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		err("No new device found\n");
		retval = -1;
		goto err_exit;
	}

1050
	max = acpiphp_max_busnr(bus);
1051 1052 1053 1054 1055
	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 ||
1056
			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1057
				max = pci_scan_bridge(bus, dev, max, pass);
1058
				if (pass && dev->subordinate)
1059 1060
					pci_bus_size_bridges(dev->subordinate);
			}
1061
		}
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1062 1063
	}

1064 1065 1066 1067 1068
	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
		acpiphp_bus_add(func);
	}

1069
	pci_bus_assign_resources(bus);
1070 1071
	acpiphp_sanitize_bus(bus);
	pci_enable_bridges(bus);
1072
	pci_bus_add_devices(bus);
1073 1074
	acpiphp_set_hpp_values(slot->bridge->handle, bus);
	acpiphp_configure_ioapics(slot->bridge->handle);
1075

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	/* associate pci_dev to our representation */
	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
1079
		func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
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Linus Torvalds 已提交
1080
							func->function));
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
		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);
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	}

	slot->flags |= SLOT_ENABLED;

 err_exit:
	return retval;
}


/**
 * disable_device - disable a 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);
1116

1117 1118 1119 1120 1121 1122 1123
		if (func->bridge) {
			/* cleanup p2p bridges under this P2P bridge */
			cleanup_p2p_bridge(func->bridge->handle,
						(u32)1, NULL, NULL);
			func->bridge = NULL;
		}

1124 1125 1126 1127
		acpiphp_bus_trim(func->handle);
		/* try to remove anyway.
		 * acpiphp_bus_add might have been failed */

1128 1129
		if (!func->pci_dev)
			continue;
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1131 1132 1133
		pci_remove_bus_device(func->pci_dev);
		pci_dev_put(func->pci_dev);
		func->pci_dev = NULL;
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1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
	}

	slot->flags &= (~SLOT_ENABLED);

 err_exit:
	return retval;
}


/**
 * get_slot_status - get ACPI slot status
 *
 * 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 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;
}

1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
/**
 * acpiphp_eject_slot - physically eject the slot
 */
static 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", __FUNCTION__);
				return -1;
			} else
				break;
		}
	}
	return 0;
}

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1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
/**
 * acpiphp_check_bridge - re-enumerate devices
 *
 * 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;
1240 1241
			} else {
				acpiphp_eject_slot(slot);
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			}
			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", __FUNCTION__, enabled, disabled);

 err_exit:
	return retval;
}

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
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;
1272

1273
	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1274
			bridge->hpp.t0->cache_line_size);
1275
	pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1276
			bridge->hpp.t0->latency_timer);
1277
	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1278
	if (bridge->hpp.t0->enable_serr)
1279 1280 1281
		pci_cmd |= PCI_COMMAND_SERR;
	else
		pci_cmd &= ~PCI_COMMAND_SERR;
1282
	if (bridge->hpp.t0->enable_perr)
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		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,
1291
				bridge->hpp.t0->latency_timer);
1292
		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1293
		if (bridge->hpp.t0->enable_serr)
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			pci_bctl |= PCI_BRIDGE_CTL_SERR;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1297
		if (bridge->hpp.t0->enable_perr)
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			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;
1317
	bridge.pci_bus = bus;
1318
	bridge.pci_dev = bus->self;
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	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);
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	acpiphp_configure_ioapics(handle);
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	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");

}

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/*
 * ACPI event handlers
 */

/**
 * 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 };
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	struct acpi_device *device;
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	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 (!bridge) {
		err("cannot get bridge info\n");
		return;
	}
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	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", __FUNCTION__, objname);
		acpiphp_check_bridge(bridge);
		break;

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

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

	case ACPI_NOTIFY_EJECT_REQUEST:
		/* request device eject */
		dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
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		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);
		}
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		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
 *
 */
1500
void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
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{
	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", __FUNCTION__, 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", __FUNCTION__, objname);
		acpiphp_check_bridge(func->slot->bridge);
		break;

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

	case ACPI_NOTIFY_EJECT_REQUEST:
		/* request device eject */
		dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1532 1533
		if (!(acpiphp_disable_slot(func->slot)))
			acpiphp_eject_slot(func->slot);
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		break;

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

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

1548
	if (acpi_root_bridge(handle)) {
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		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
				handle_hotplug_event_bridge, NULL);
			(*count)++;
	}
	return AE_OK ;
}
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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)
{
1567
	int num = 0;
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	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
			ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
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	if (num <= 0)
		return -1;
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	else
		acpi_pci_register_driver(&acpi_pci_hp_driver);
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	return 0;
}


/**
 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
 *
 * This function frees all data allocated in acpiphp_glue_init()
 */
void __exit 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 list_head *node;
	struct acpiphp_bridge *bridge;
	int num_slots;

	num_slots = 0;

	list_for_each (node, &bridge_list) {
		bridge = (struct acpiphp_bridge *)node;
1605 1606 1607 1608
		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");
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		num_slots += bridge->nr_slots;
	}

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	dbg("Total %d slots\n", num_slots);
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	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
 */
int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
	int retval;

1653
	mutex_lock(&slot->crit_sect);
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	/* wake up all functions */
	retval = power_on_slot(slot);
	if (retval)
		goto err_exit;

1660
	if (get_slot_status(slot) == ACPI_STA_ALL) {
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		/* configure all functions */
		retval = enable_device(slot);
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		if (retval)
			power_off_slot(slot);
	} else {
		dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__);
		power_off_slot(slot);
	}
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 err_exit:
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	mutex_unlock(&slot->crit_sect);
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	return retval;
}

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

1682
	mutex_lock(&slot->crit_sect);
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	/* 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:
1695
	mutex_unlock(&slot->crit_sect);
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	return retval;
}


/*
 * slot enabled:  1
 * slot disabled: 0
 */
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
{
1706
	return (slot->flags & SLOT_POWEREDON);
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}


/*
 * latch closed:  1
 * latch   open:  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) ? 1 : 0;
}


/*
 * 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;
}


/*
 * pci address (seg/bus/dev)
 */
u32 acpiphp_get_address(struct acpiphp_slot *slot)
{
	u32 address;
1744
	struct pci_bus *pci_bus = slot->bridge->pci_bus;
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	address = (pci_domain_nr(pci_bus) << 16) |
		  (pci_bus->number << 8) |
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		  slot->device;

	return address;
}