acpiphp_glue.c 43.1 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.
 *
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 * Send feedback to <kristen.c.accardi@intel.com>
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 *
 */

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

static LIST_HEAD(bridge_list);
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static LIST_HEAD(ioapic_list);
static DEFINE_SPINLOCK(ioapic_list_lock);
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#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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static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
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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);
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	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;
	}
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	/* 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;
}
L
Linus Torvalds 已提交
639

640
static void cleanup_bridge(struct acpiphp_bridge *bridge)
L
Linus Torvalds 已提交
641
{
642 643 644
	struct list_head *list, *tmp;
	struct acpiphp_slot *slot;
	acpi_status status;
645
	acpi_handle handle = bridge->handle;
646 647 648 649 650 651

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

652 653 654 655 656 657 658 659 660 661
	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");
	}

662 663 664 665 666 667
	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
668 669 670 671
			if (is_dock_device(func->handle)) {
				unregister_hotplug_dock_device(func->handle);
				unregister_dock_notifier(&func->nb);
			}
672 673
			if (!(func->flags & FUNC_HAS_DCK)) {
				status = acpi_remove_notify_handler(func->handle,
674 675
						ACPI_SYSTEM_NOTIFY,
						handle_hotplug_event_func);
676 677 678
				if (ACPI_FAILURE(status))
					err("failed to remove notify handler\n");
			}
679 680 681 682
			pci_dev_put(func->pci_dev);
			list_del(list);
			kfree(func);
		}
683 684
		acpiphp_unregister_hotplug_slot(slot);
		list_del(&slot->funcs);
685 686 687 688 689 690 691
		kfree(slot);
		slot = next;
	}

	pci_dev_put(bridge->pci_dev);
	list_del(&bridge->list);
	kfree(bridge);
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Linus Torvalds 已提交
692 693
}

694 695 696 697 698
static acpi_status
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpiphp_bridge *bridge;

699 700 701 702 703
	/* 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);

704 705 706 707 708 709 710 711 712 713
	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;

714 715 716 717 718
	/* 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);

719
	bridge = acpiphp_handle_to_bridge(handle);
720
	if (bridge)
721 722
		cleanup_bridge(bridge);
}
L
Linus Torvalds 已提交
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
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;
775 776 777
	switch (((struct acpi_subtable_header *)table)->type) {
	case ACPI_MADT_TYPE_IO_SAPIC:
		*gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
778 779
		result = 0;
		break;
780 781
	case ACPI_MADT_TYPE_IO_APIC:
		*gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
782 783 784 785 786 787
		result = 0;
		break;
	default:
		break;
	}
 out:
788
	kfree(buffer.pointer);
789 790 791 792 793 794 795 796 797 798 799 800
	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;
801
	struct acpiphp_ioapic *ioapic;
802 803 804 805 806 807 808 809 810 811 812 813 814 815

	/* 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;

816 817 818 819
	ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
	if (!ioapic)
		return AE_NO_MEMORY;

820 821
	pdev = get_apic_pci_info(handle);
	if (!pdev)
822
		goto exit_kfree;
823

824 825
	if (pci_enable_device(pdev))
		goto exit_pci_dev_put;
826 827 828

	pci_set_master(pdev);

829 830
	if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
		goto exit_pci_disable_device;
831 832

	phys_addr = pci_resource_start(pdev, 0);
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
	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 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))
876
		return AE_OK;
877 878 879 880 881 882 883 884 885 886

	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;
887
	}
888 889 890 891 892 893 894 895 896
	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);
897 898 899 900 901 902

	return AE_OK;
}

static int acpiphp_configure_ioapics(acpi_handle handle)
{
903
	ioapic_add(handle, 0, NULL, NULL);
904 905 906 907 908
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
			    ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
	return 0;
}

909 910 911 912 913 914 915 916
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;
}

L
Linus Torvalds 已提交
917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
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);

967
		if (func->flags & FUNC_HAS_PS3) {
L
Linus Torvalds 已提交
968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
			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;
}


987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033

/**
 * 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;
	}
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
	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;
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
	}
	/*
	 * 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;
}


1063 1064 1065 1066 1067
/**
 * acpiphp_bus_trim - trim a bus from acpi subsystem
 * @handle: handle to acpi namespace
 *
 */
1068
static int acpiphp_bus_trim(acpi_handle handle)
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
{
	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;
}
1085

L
Linus Torvalds 已提交
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
/**
 * 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;
1097
	struct pci_bus *bus = slot->bridge->pci_bus;
L
Linus Torvalds 已提交
1098 1099 1100
	struct list_head *l;
	struct acpiphp_func *func;
	int retval = 0;
1101
	int num, max, pass;
1102
	acpi_status status;
L
Linus Torvalds 已提交
1103 1104 1105 1106 1107

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

	/* sanity check: dev should be NULL when hot-plugged in */
1108
	dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
L
Linus Torvalds 已提交
1109 1110 1111
	if (dev) {
		/* This case shouldn't happen */
		err("pci_dev structure already exists.\n");
1112
		pci_dev_put(dev);
L
Linus Torvalds 已提交
1113 1114 1115 1116
		retval = -1;
		goto err_exit;
	}

1117 1118
	num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
	if (num == 0) {
L
Linus Torvalds 已提交
1119 1120 1121 1122 1123
		err("No new device found\n");
		retval = -1;
		goto err_exit;
	}

1124
	max = acpiphp_max_busnr(bus);
1125 1126 1127 1128 1129
	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 ||
1130
			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1131
				max = pci_scan_bridge(bus, dev, max, pass);
1132
				if (pass && dev->subordinate)
1133 1134
					pci_bus_size_bridges(dev->subordinate);
			}
1135
		}
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Linus Torvalds 已提交
1136 1137
	}

1138 1139 1140 1141 1142
	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
		acpiphp_bus_add(func);
	}

1143
	pci_bus_assign_resources(bus);
1144
	acpiphp_sanitize_bus(bus);
1145
	acpiphp_set_hpp_values(slot->bridge->handle, bus);
1146 1147
	list_for_each_entry(func, &slot->funcs, sibling)
		acpiphp_configure_ioapics(func->handle);
1148
	pci_enable_bridges(bus);
1149 1150
	pci_bus_add_devices(bus);

L
Linus Torvalds 已提交
1151 1152 1153
	/* associate pci_dev to our representation */
	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
1154
		func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
L
Linus Torvalds 已提交
1155
							func->function));
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
		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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1167 1168 1169 1170 1171 1172 1173 1174
	}

	slot->flags |= SLOT_ENABLED;

 err_exit:
	return retval;
}

S
Satoru Takeuchi 已提交
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
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);
		}
	}
}
L
Linus Torvalds 已提交
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200

/**
 * 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);
1201

1202 1203 1204 1205 1206 1207 1208
		if (func->bridge) {
			/* cleanup p2p bridges under this P2P bridge */
			cleanup_p2p_bridge(func->bridge->handle,
						(u32)1, NULL, NULL);
			func->bridge = NULL;
		}

S
Satoru Takeuchi 已提交
1209
		if (func->pci_dev) {
1210
			pci_stop_bus_device(func->pci_dev);
S
Satoru Takeuchi 已提交
1211 1212 1213 1214 1215
			if (func->pci_dev->subordinate) {
				disable_bridges(func->pci_dev->subordinate);
				pci_disable_device(func->pci_dev);
			}
		}
1216 1217 1218 1219
	}

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
1220

1221
		acpiphp_unconfigure_ioapics(func->handle);
1222 1223 1224 1225
		acpiphp_bus_trim(func->handle);
		/* try to remove anyway.
		 * acpiphp_bus_add might have been failed */

1226 1227
		if (!func->pci_dev)
			continue;
L
Linus Torvalds 已提交
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1229 1230 1231
		pci_remove_bus_device(func->pci_dev);
		pci_dev_put(func->pci_dev);
		func->pci_dev = NULL;
L
Linus Torvalds 已提交
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
	}

	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;
}

1282 1283 1284
/**
 * acpiphp_eject_slot - physically eject the slot
 */
1285
int acpiphp_eject_slot(struct acpiphp_slot *slot)
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
{
	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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/**
 * 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;
1338 1339
			} 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;
}

1360 1361 1362 1363 1364 1365 1366 1367 1368 1369
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;
1370

1371 1372 1373
	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
		return;

1374
	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1375
			bridge->hpp.t0->cache_line_size);
1376
	pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1377
			bridge->hpp.t0->latency_timer);
1378
	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1379
	if (bridge->hpp.t0->enable_serr)
1380 1381 1382
		pci_cmd |= PCI_COMMAND_SERR;
	else
		pci_cmd &= ~PCI_COMMAND_SERR;
1383
	if (bridge->hpp.t0->enable_perr)
1384 1385 1386 1387 1388 1389 1390 1391
		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,
1392
				bridge->hpp.t0->latency_timer);
1393
		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1394
		if (bridge->hpp.t0->enable_serr)
1395 1396 1397
			pci_bctl |= PCI_BRIDGE_CTL_SERR;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1398
		if (bridge->hpp.t0->enable_perr)
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
			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;
1418
	bridge.pci_bus = bus;
1419
	bridge.pci_dev = bus->self;
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
	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);
1472
	acpiphp_configure_ioapics(handle);
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
	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 };
1524
	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);
1561 1562 1563 1564 1565 1566 1567
		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
 *
 */
1601
static 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);
1633 1634
		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;
	}
}

1643 1644 1645 1646 1647 1648

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

1649
	if (acpi_root_bridge(handle)) {
1650 1651 1652 1653 1654 1655
		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)
{
1668
	int num = 0;
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1670 1671
	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;
1675 1676
	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()
 */
1687
void  acpiphp_glue_exit(void)
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{
	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;
1699
	int num_slots = 0;
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1701
	list_for_each_entry (bridge, &bridge_list, list) {
1702 1703 1704 1705
		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;
	}

1709
	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;

1750
	mutex_lock(&slot->crit_sect);
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	/* wake up all functions */
	retval = power_on_slot(slot);
	if (retval)
		goto err_exit;

1757
	if (get_slot_status(slot) == ACPI_STA_ALL) {
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		/* configure all functions */
		retval = enable_device(slot);
1760 1761 1762 1763 1764 1765
		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:
1768
	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;

1779
	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:
1792
	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)
{
1803
	return (slot->flags & SLOT_POWEREDON);
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}


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

	sta = get_slot_status(slot);

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


/*
 * 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;
1841
	struct pci_bus *pci_bus = slot->bridge->pci_bus;
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1843 1844
	address = (pci_domain_nr(pci_bus) << 16) |
		  (pci_bus->number << 8) |
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		  slot->device;

	return address;
}