[net-next-2.6.git] / drivers / acpi / pci_slot.c

/*
 *  pci_slot.c - ACPI PCI Slot Driver
 *
 *  The code here is heavily leveraged from the acpiphp module.
 *  Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance.
 *  Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code
 *  review and fixes.
 *
 *  Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
 *  	Alex Chiang <achiang@hp.com>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms and conditions of the GNU General Public License,
 *  version 2, as published by the Free Software Foundation.
 *
 *  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.  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.,
 *  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/dmi.h>

static int debug;
static int check_sta_before_sun;

#define DRIVER_VERSION 	"0.1"
#define DRIVER_AUTHOR	"Alex Chiang <achiang@hp.com>"
#define DRIVER_DESC	"ACPI PCI Slot Detection Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
module_param(debug, bool, 0644);

#define _COMPONENT		ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_slot");

#define MY_NAME "pci_slot"
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define dbg(format, arg...)					\
	do {							\
		if (debug)					\
			printk(KERN_DEBUG "%s: " format,	\
				MY_NAME , ## arg);		\
	} while (0)

#define SLOT_NAME_SIZE 21		/* Inspired by #define in acpiphp.h */

struct acpi_pci_slot {
	acpi_handle root_handle;	/* handle of the root bridge */
	struct pci_slot *pci_slot;	/* corresponding pci_slot */
	struct list_head list;		/* node in the list of slots */
};

static int acpi_pci_slot_add(acpi_handle handle);
static void acpi_pci_slot_remove(acpi_handle handle);

static LIST_HEAD(slot_list);
static DEFINE_MUTEX(slot_list_lock);
static struct acpi_pci_driver acpi_pci_slot_driver = {
	.add = acpi_pci_slot_add,
	.remove = acpi_pci_slot_remove,
};

static int
check_slot(acpi_handle handle, unsigned long long *sun)
{
	int device = -1;
	unsigned long long adr, sta;
	acpi_status status;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
	dbg("Checking slot on path: %s\n", (char *)buffer.pointer);

	if (check_sta_before_sun) {
		/* If SxFy doesn't have _STA, we just assume it's there */
		status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
		if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
			goto out;
	}

	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
	if (ACPI_FAILURE(status)) {
		dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
		goto out;
	}

	/* No _SUN == not a slot == bail */
	status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
	if (ACPI_FAILURE(status)) {
		dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
		goto out;
	}

	device = (adr >> 16) & 0xffff;
out:
	kfree(buffer.pointer);
	return device;
}

struct callback_args {
	acpi_walk_callback	user_function;	/* only for walk_p2p_bridge */
	struct pci_bus		*pci_bus;
	acpi_handle		root_handle;
};

/*
 * register_slot
 *
 * Called once for each SxFy object in the namespace. Don't worry about
 * calling pci_create_slot multiple times for the same pci_bus:device,
 * since each subsequent call simply bumps the refcount on the pci_slot.
 *
 * The number of calls to pci_destroy_slot from unregister_slot is
 * symmetrical.
 */
static acpi_status
register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int device;
	unsigned long long sun;
	char name[SLOT_NAME_SIZE];
	struct acpi_pci_slot *slot;
	struct pci_slot *pci_slot;
	struct callback_args *parent_context = context;
	struct pci_bus *pci_bus = parent_context->pci_bus;

	device = check_slot(handle, &sun);
	if (device < 0)
		return AE_OK;

	slot = kmalloc(sizeof(*slot), GFP_KERNEL);
	if (!slot) {
		err("%s: cannot allocate memory\n", __func__);
		return AE_OK;
	}

	snprintf(name, sizeof(name), "%llu", sun);
	pci_slot = pci_create_slot(pci_bus, device, name, NULL);
	if (IS_ERR(pci_slot)) {
		err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
		kfree(slot);
		return AE_OK;
	}

	slot->root_handle = parent_context->root_handle;
	slot->pci_slot = pci_slot;
	INIT_LIST_HEAD(&slot->list);
	mutex_lock(&slot_list_lock);
	list_add(&slot->list, &slot_list);
	mutex_unlock(&slot_list_lock);

	get_device(&pci_bus->dev);

	dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n",
		pci_slot, pci_bus->number, device, name);

	return AE_OK;
}

/*
 * walk_p2p_bridge - discover and walk p2p bridges
 * @handle: points to an acpi_pci_root
 * @context: p2p_bridge_context pointer
 *
 * Note that when we call ourselves recursively, we pass a different
 * value of pci_bus in the child_context.
 */
static acpi_status
walk_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int device, function;
	unsigned long long adr;
	acpi_status status;
	acpi_handle dummy_handle;
	acpi_walk_callback user_function;

	struct pci_dev *dev;
	struct pci_bus *pci_bus;
	struct callback_args child_context;
	struct callback_args *parent_context = context;

	pci_bus = parent_context->pci_bus;
	user_function = parent_context->user_function;

	status = acpi_get_handle(handle, "_ADR", &dummy_handle);
	if (ACPI_FAILURE(status))
		return AE_OK;

	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
	if (ACPI_FAILURE(status))
		return AE_OK;

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

	dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
	if (!dev || !dev->subordinate)
		goto out;

	child_context.pci_bus = dev->subordinate;
	child_context.user_function = user_function;
	child_context.root_handle = parent_context->root_handle;

	dbg("p2p bridge walk, pci_bus = %x\n", dev->subordinate->number);
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
				     user_function, &child_context, NULL);
	if (ACPI_FAILURE(status))
		goto out;

	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
				     walk_p2p_bridge, &child_context, NULL);
out:
	pci_dev_put(dev);
	return AE_OK;
}

/*
 * walk_root_bridge - generic root bridge walker
 * @handle: points to an acpi_pci_root
 * @user_function: user callback for slot objects
 *
 * Call user_function for all objects underneath this root bridge.
 * Walk p2p bridges underneath us and call user_function on those too.
 */
static int
walk_root_bridge(acpi_handle handle, acpi_walk_callback user_function)
{
	int seg, bus;
	unsigned long long tmp;
	acpi_status status;
	acpi_handle dummy_handle;
	struct pci_bus *pci_bus;
	struct callback_args context;

	/* 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)) {
			info("%s: _STA evaluation failure\n", __func__);
			return 0;
		}
		if ((tmp & ACPI_STA_DEVICE_FUNCTIONING) == 0)
			/* don't register this object */
			return 0;
	}

	status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
	seg = ACPI_SUCCESS(status) ? tmp : 0;

	status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
	bus = ACPI_SUCCESS(status) ? tmp : 0;

	pci_bus = pci_find_bus(seg, bus);
	if (!pci_bus)
		return 0;

	context.pci_bus = pci_bus;
	context.user_function = user_function;
	context.root_handle = handle;

	dbg("root bridge walk, pci_bus = %x\n", pci_bus->number);
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
				     user_function, &context, NULL);
	if (ACPI_FAILURE(status))
		return status;

	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
				     walk_p2p_bridge, &context, NULL);
	if (ACPI_FAILURE(status))
		err("%s: walk_p2p_bridge failure - %d\n", __func__, status);

	return status;
}

/*
 * acpi_pci_slot_add
 * @handle: points to an acpi_pci_root
 */
static int
acpi_pci_slot_add(acpi_handle handle)
{
	acpi_status status;

	status = walk_root_bridge(handle, register_slot);
	if (ACPI_FAILURE(status))
		err("%s: register_slot failure - %d\n", __func__, status);

	return status;
}

/*
 * acpi_pci_slot_remove
 * @handle: points to an acpi_pci_root
 */
static void
acpi_pci_slot_remove(acpi_handle handle)
{
	struct acpi_pci_slot *slot, *tmp;
	struct pci_bus *pbus;

	mutex_lock(&slot_list_lock);
	list_for_each_entry_safe(slot, tmp, &slot_list, list) {
		if (slot->root_handle == handle) {
			list_del(&slot->list);
			pbus = slot->pci_slot->bus;
			pci_destroy_slot(slot->pci_slot);
			put_device(&pbus->dev);
			kfree(slot);
		}
	}
	mutex_unlock(&slot_list_lock);
}

static int do_sta_before_sun(const struct dmi_system_id *d)
{
	info("%s detected: will evaluate _STA before calling _SUN\n", d->ident);
	check_sta_before_sun = 1;
	return 0;
}

static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
	/*
	 * Fujitsu Primequest machines will return 1023 to indicate an
	 * error if the _SUN method is evaluated on SxFy objects that
	 * are not present (as indicated by _STA), so for those machines,
	 * we want to check _STA before evaluating _SUN.
	 */
	{
	 .callback = do_sta_before_sun,
	 .ident = "Fujitsu PRIMEQUEST",
	 .matches = {
		DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
		DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
		},
	},
	{}
};

static int __init
acpi_pci_slot_init(void)
{
	dmi_check_system(acpi_pci_slot_dmi_table);
	acpi_pci_register_driver(&acpi_pci_slot_driver);
	return 0;
}

static void __exit
acpi_pci_slot_exit(void)
{
	acpi_pci_unregister_driver(&acpi_pci_slot_driver);
}

module_init(acpi_pci_slot_init);
module_exit(acpi_pci_slot_exit);
Commit	Line	Data
8344b568 AC	1	/*
	2	* pci_slot.c - ACPI PCI Slot Driver
	3	*
	4	* The code here is heavily leveraged from the acpiphp module.
	5	* Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance.
	6	* Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code
	7	* review and fixes.
	8	*
e4268aad AC	9	* Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
e4268aad AC	10	* Alex Chiang <achiang@hp.com>
8344b568 AC	11	*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms and conditions of the GNU General Public License,
	14	* version 2, as published by the Free Software Foundation.
	15	*
	16	* This program is distributed in the hope that it will be useful, but
	17	* WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	* General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License along
	22	* with this program; if not, write to the Free Software Foundation, Inc.,
	23	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/types.h>
	30	#include <linux/pci.h>
	31	#include <linux/acpi.h>
	32	#include <acpi/acpi_bus.h>
	33	#include <acpi/acpi_drivers.h>
eb27cae8	34	#include <linux/dmi.h>
8344b568 AC	35
	36	static int debug;
	37	static int check_sta_before_sun;
	38
	39	#define DRIVER_VERSION "0.1"
	40	#define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>"
	41	#define DRIVER_DESC "ACPI PCI Slot Detection Driver"
	42	MODULE_AUTHOR(DRIVER_AUTHOR);
	43	MODULE_DESCRIPTION(DRIVER_DESC);
	44	MODULE_LICENSE("GPL");
	45	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
	46	module_param(debug, bool, 0644);
	47
	48	#define _COMPONENT ACPI_PCI_COMPONENT
	49	ACPI_MODULE_NAME("pci_slot");
	50
	51	#define MY_NAME "pci_slot"
	52	#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
	53	#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
	54	#define dbg(format, arg...) \
	55	do { \
	56	if (debug) \
	57	printk(KERN_DEBUG "%s: " format, \
	58	MY_NAME , ## arg); \
	59	} while (0)
	60
7e24bc1c	61	#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
8344b568 AC	62
	63	struct acpi_pci_slot {
	64	acpi_handle root_handle; /* handle of the root bridge */
	65	struct pci_slot pci_slot; / corresponding pci_slot */
	66	struct list_head list; /* node in the list of slots */
	67	};
	68
	69	static int acpi_pci_slot_add(acpi_handle handle);
	70	static void acpi_pci_slot_remove(acpi_handle handle);
	71
	72	static LIST_HEAD(slot_list);
	73	static DEFINE_MUTEX(slot_list_lock);
	74	static struct acpi_pci_driver acpi_pci_slot_driver = {
	75	.add = acpi_pci_slot_add,
	76	.remove = acpi_pci_slot_remove,
	77	};
	78
	79	static int
27663c58	80	check_slot(acpi_handle handle, unsigned long long *sun)
8344b568	81	{
362b7077	82	int device = -1;
27663c58	83	unsigned long long adr, sta;
8344b568 AC	84	acpi_status status;
	85	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	86
	87	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
	88	dbg("Checking slot on path: %s\n", (char *)buffer.pointer);
	89
	90	if (check_sta_before_sun) {
	91	/* If SxFy doesn't have _STA, we just assume it's there */
	92	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
362b7077	93	if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
8344b568	94	goto out;
8344b568 AC	95	}
	96
	97	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
	98	if (ACPI_FAILURE(status)) {
	99	dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
8344b568 AC	100	goto out;
	101	}
	102
8344b568 AC	103	/* No _SUN == not a slot == bail */
	104	status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
	105	if (ACPI_FAILURE(status)) {
	106	dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
8344b568 AC	107	goto out;
	108	}
	109
362b7077	110	device = (adr >> 16) & 0xffff;
8344b568 AC	111	out:
8344b568 AC	112	kfree(buffer.pointer);
362b7077	113	return device;
8344b568 AC	114	}
	115
	116	struct callback_args {
	117	acpi_walk_callback user_function; /* only for walk_p2p_bridge */
	118	struct pci_bus *pci_bus;
	119	acpi_handle root_handle;
	120	};
	121
	122	/*
	123	* register_slot
	124	*
	125	* Called once for each SxFy object in the namespace. Don't worry about
	126	* calling pci_create_slot multiple times for the same pci_bus:device,
	127	* since each subsequent call simply bumps the refcount on the pci_slot.
	128	*
	129	* The number of calls to pci_destroy_slot from unregister_slot is
	130	* symmetrical.
	131	*/
	132	static acpi_status
	133	register_slot(acpi_handle handle, u32 lvl, void context, void *rv)
	134	{
	135	int device;
27663c58	136	unsigned long long sun;
8344b568 AC	137	char name[SLOT_NAME_SIZE];
	138	struct acpi_pci_slot *slot;
	139	struct pci_slot *pci_slot;
	140	struct callback_args *parent_context = context;
	141	struct pci_bus *pci_bus = parent_context->pci_bus;
	142
362b7077 MW	143	device = check_slot(handle, &sun);
362b7077 MW	144	if (device < 0)
8344b568 AC	145	return AE_OK;
	146
	147	slot = kmalloc(sizeof(*slot), GFP_KERNEL);
	148	if (!slot) {
	149	err("%s: cannot allocate memory\n", __func__);
	150	return AE_OK;
	151	}
	152
7e24bc1c	153	snprintf(name, sizeof(name), "%llu", sun);
828f3768	154	pci_slot = pci_create_slot(pci_bus, device, name, NULL);
8344b568 AC	155	if (IS_ERR(pci_slot)) {
	156	err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
	157	kfree(slot);
e4268aad	158	return AE_OK;
8344b568 AC	159	}
	160
	161	slot->root_handle = parent_context->root_handle;
	162	slot->pci_slot = pci_slot;
	163	INIT_LIST_HEAD(&slot->list);
	164	mutex_lock(&slot_list_lock);
	165	list_add(&slot->list, &slot_list);
	166	mutex_unlock(&slot_list_lock);
	167
72800360 AC	168	get_device(&pci_bus->dev);
72800360 AC	169
8344b568 AC	170	dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n",
	171	pci_slot, pci_bus->number, device, name);
	172
	173	return AE_OK;
	174	}
	175
	176	/*
	177	* walk_p2p_bridge - discover and walk p2p bridges
	178	* @handle: points to an acpi_pci_root
	179	* @context: p2p_bridge_context pointer
	180	*
	181	* Note that when we call ourselves recursively, we pass a different
	182	* value of pci_bus in the child_context.
	183	*/
	184	static acpi_status
	185	walk_p2p_bridge(acpi_handle handle, u32 lvl, void context, void *rv)
	186	{
	187	int device, function;
27663c58	188	unsigned long long adr;
8344b568 AC	189	acpi_status status;
	190	acpi_handle dummy_handle;
	191	acpi_walk_callback user_function;
	192
	193	struct pci_dev *dev;
	194	struct pci_bus *pci_bus;
	195	struct callback_args child_context;
	196	struct callback_args *parent_context = context;
	197
	198	pci_bus = parent_context->pci_bus;
	199	user_function = parent_context->user_function;
	200
	201	status = acpi_get_handle(handle, "_ADR", &dummy_handle);
	202	if (ACPI_FAILURE(status))
	203	return AE_OK;
	204
	205	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
	206	if (ACPI_FAILURE(status))
	207	return AE_OK;
	208
	209	device = (adr >> 16) & 0xffff;
	210	function = adr & 0xffff;
	211
	212	dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
	213	if (!dev \|\| !dev->subordinate)
	214	goto out;
	215
	216	child_context.pci_bus = dev->subordinate;
	217	child_context.user_function = user_function;
	218	child_context.root_handle = parent_context->root_handle;
	219
	220	dbg("p2p bridge walk, pci_bus = %x\n", dev->subordinate->number);
	221	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
	222	user_function, &child_context, NULL);
	223	if (ACPI_FAILURE(status))
	224	goto out;
	225
	226	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
	227	walk_p2p_bridge, &child_context, NULL);
	228	out:
	229	pci_dev_put(dev);
	230	return AE_OK;
	231	}
	232
	233	/*
	234	* walk_root_bridge - generic root bridge walker
	235	* @handle: points to an acpi_pci_root
	236	* @user_function: user callback for slot objects
	237	*
	238	* Call user_function for all objects underneath this root bridge.
	239	* Walk p2p bridges underneath us and call user_function on those too.
	240	*/
	241	static int
	242	walk_root_bridge(acpi_handle handle, acpi_walk_callback user_function)
	243	{
	244	int seg, bus;
27663c58	245	unsigned long long tmp;
8344b568 AC	246	acpi_status status;
	247	acpi_handle dummy_handle;
	248	struct pci_bus *pci_bus;
	249	struct callback_args context;
	250
	251	/* If the bridge doesn't have _STA, we assume it is always there */
	252	status = acpi_get_handle(handle, "_STA", &dummy_handle);
	253	if (ACPI_SUCCESS(status)) {
	254	status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
	255	if (ACPI_FAILURE(status)) {
	256	info("%s: _STA evaluation failure\n", __func__);
	257	return 0;
	258	}
	259	if ((tmp & ACPI_STA_DEVICE_FUNCTIONING) == 0)
	260	/* don't register this object */
	261	return 0;
	262	}
	263
	264	status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
	265	seg = ACPI_SUCCESS(status) ? tmp : 0;
	266
	267	status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
	268	bus = ACPI_SUCCESS(status) ? tmp : 0;
	269
	270	pci_bus = pci_find_bus(seg, bus);
	271	if (!pci_bus)
	272	return 0;
	273
	274	context.pci_bus = pci_bus;
	275	context.user_function = user_function;
	276	context.root_handle = handle;
	277
	278	dbg("root bridge walk, pci_bus = %x\n", pci_bus->number);
	279	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
	280	user_function, &context, NULL);
	281	if (ACPI_FAILURE(status))
	282	return status;
	283
	284	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
	285	walk_p2p_bridge, &context, NULL);
	286	if (ACPI_FAILURE(status))
	287	err("%s: walk_p2p_bridge failure - %d\n", __func__, status);
	288
	289	return status;
	290	}
	291
	292	/*
	293	* acpi_pci_slot_add
	294	* @handle: points to an acpi_pci_root
	295	*/
	296	static int
	297	acpi_pci_slot_add(acpi_handle handle)
	298	{
	299	acpi_status status;
	300
	301	status = walk_root_bridge(handle, register_slot);
	302	if (ACPI_FAILURE(status))
	303	err("%s: register_slot failure - %d\n", __func__, status);
	304
	305	return status;
	306	}
	307
	308	/*
	309	* acpi_pci_slot_remove
310	* @handle: points to an acpi_pci_root
311	*/
312	static void
313	acpi_pci_slot_remove(acpi_handle handle)
314	{
315	struct acpi_pci_slot slot, tmp;
72800360	316	struct pci_bus *pbus;
8344b568 AC	317
	318	mutex_lock(&slot_list_lock);
	319	list_for_each_entry_safe(slot, tmp, &slot_list, list) {
	320	if (slot->root_handle == handle) {
	321	list_del(&slot->list);
72800360	322	pbus = slot->pci_slot->bus;
8344b568	323	pci_destroy_slot(slot->pci_slot);
72800360	324	put_device(&pbus->dev);
8344b568 AC	325	kfree(slot);
	326	}
	327	}
	328	mutex_unlock(&slot_list_lock);
	329	}
	330
	331	static int do_sta_before_sun(const struct dmi_system_id *d)
	332	{
	333	info("%s detected: will evaluate _STA before calling _SUN\n", d->ident);
	334	check_sta_before_sun = 1;
	335	return 0;
	336	}
	337
	338	static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
	339	/*
	340	* Fujitsu Primequest machines will return 1023 to indicate an
	341	* error if the _SUN method is evaluated on SxFy objects that
	342	* are not present (as indicated by _STA), so for those machines,
	343	* we want to check _STA before evaluating _SUN.
	344	*/
	345	{
	346	.callback = do_sta_before_sun,
	347	.ident = "Fujitsu PRIMEQUEST",
	348	.matches = {
	349	DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
	350	DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
	351	},
	352	},
	353	{}
	354	};
	355
	356	static int __init
	357	acpi_pci_slot_init(void)
	358	{
	359	dmi_check_system(acpi_pci_slot_dmi_table);
	360	acpi_pci_register_driver(&acpi_pci_slot_driver);
	361	return 0;
	362	}
	363
	364	static void __exit
	365	acpi_pci_slot_exit(void)
	366	{
	367	acpi_pci_unregister_driver(&acpi_pci_slot_driver);
	368	}
	369
	370	module_init(acpi_pci_slot_init);
	371	module_exit(acpi_pci_slot_exit);