[linux.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 <[email protected]> for much guidance.
 *  Thanks to Kenji Kaneshige <[email protected]> for code
 *  review and fixes.
 *
 *  Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
 *  	Alex Chiang <[email protected]>
 *
 *  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>

static int debug;
static int check_sta_before_sun;

#define DRIVER_VERSION 	"0.1"
#define DRIVER_AUTHOR	"Alex Chiang <[email protected]>"
#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 20		/* 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), "%u", (u32)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);

	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;

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