[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pci / slot.c

/*
 * drivers/pci/slot.c
 * Copyright (C) 2006 Matthew Wilcox <matthew@wil.cx>
 * Copyright (C) 2006-2009 Hewlett-Packard Development Company, L.P.
 *	Alex Chiang <achiang@hp.com>
 */

#include <linux/kobject.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/err.h>
#include "pci.h"

struct kset *pci_slots_kset;
EXPORT_SYMBOL_GPL(pci_slots_kset);

static ssize_t pci_slot_attr_show(struct kobject *kobj,
					struct attribute *attr, char *buf)
{
	struct pci_slot *slot = to_pci_slot(kobj);
	struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
	return attribute->show ? attribute->show(slot, buf) : -EIO;
}

static ssize_t pci_slot_attr_store(struct kobject *kobj,
			struct attribute *attr, const char *buf, size_t len)
{
	struct pci_slot *slot = to_pci_slot(kobj);
	struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
	return attribute->store ? attribute->store(slot, buf, len) : -EIO;
}

static const struct sysfs_ops pci_slot_sysfs_ops = {
	.show = pci_slot_attr_show,
	.store = pci_slot_attr_store,
};

static ssize_t address_read_file(struct pci_slot *slot, char *buf)
{
	if (slot->number == 0xff)
		return sprintf(buf, "%04x:%02x\n",
				pci_domain_nr(slot->bus),
				slot->bus->number);
	else
		return sprintf(buf, "%04x:%02x:%02x\n",
				pci_domain_nr(slot->bus),
				slot->bus->number,
				slot->number);
}

/* these strings match up with the values in pci_bus_speed */
static const char *pci_bus_speed_strings[] = {
	"33 MHz PCI",		/* 0x00 */
	"66 MHz PCI",		/* 0x01 */
	"66 MHz PCI-X", 	/* 0x02 */
	"100 MHz PCI-X",	/* 0x03 */
	"133 MHz PCI-X",	/* 0x04 */
	NULL,			/* 0x05 */
	NULL,			/* 0x06 */
	NULL,			/* 0x07 */
	NULL,			/* 0x08 */
	"66 MHz PCI-X 266",	/* 0x09 */
	"100 MHz PCI-X 266",	/* 0x0a */
	"133 MHz PCI-X 266",	/* 0x0b */
	"Unknown AGP",		/* 0x0c */
	"1x AGP",		/* 0x0d */
	"2x AGP",		/* 0x0e */
	"4x AGP",		/* 0x0f */
	"8x AGP",		/* 0x10 */
	"66 MHz PCI-X 533",	/* 0x11 */
	"100 MHz PCI-X 533",	/* 0x12 */
	"133 MHz PCI-X 533",	/* 0x13 */
	"2.5 GT/s PCIe",	/* 0x14 */
	"5.0 GT/s PCIe",	/* 0x15 */
	"8.0 GT/s PCIe",	/* 0x16 */
};

static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)
{
	const char *speed_string;

	if (speed < ARRAY_SIZE(pci_bus_speed_strings))
		speed_string = pci_bus_speed_strings[speed];
	else
		speed_string = "Unknown";

	return sprintf(buf, "%s\n", speed_string);
}

static ssize_t max_speed_read_file(struct pci_slot *slot, char *buf)
{
	return bus_speed_read(slot->bus->max_bus_speed, buf);
}

static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf)
{
	return bus_speed_read(slot->bus->cur_bus_speed, buf);
}

static void pci_slot_release(struct kobject *kobj)
{
	struct pci_dev *dev;
	struct pci_slot *slot = to_pci_slot(kobj);

	dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n",
		slot->number, pci_slot_name(slot));

	list_for_each_entry(dev, &slot->bus->devices, bus_list)
		if (PCI_SLOT(dev->devfn) == slot->number)
			dev->slot = NULL;

	list_del(&slot->list);

	kfree(slot);
}

static struct pci_slot_attribute pci_slot_attr_address =
	__ATTR(address, (S_IFREG | S_IRUGO), address_read_file, NULL);
static struct pci_slot_attribute pci_slot_attr_max_speed =
	__ATTR(max_bus_speed, (S_IFREG | S_IRUGO), max_speed_read_file, NULL);
static struct pci_slot_attribute pci_slot_attr_cur_speed =
	__ATTR(cur_bus_speed, (S_IFREG | S_IRUGO), cur_speed_read_file, NULL);

static struct attribute *pci_slot_default_attrs[] = {
	&pci_slot_attr_address.attr,
	&pci_slot_attr_max_speed.attr,
	&pci_slot_attr_cur_speed.attr,
	NULL,
};

static struct kobj_type pci_slot_ktype = {
	.sysfs_ops = &pci_slot_sysfs_ops,
	.release = &pci_slot_release,
	.default_attrs = pci_slot_default_attrs,
};

static char *make_slot_name(const char *name)
{
	char *new_name;
	int len, max, dup;

	new_name = kstrdup(name, GFP_KERNEL);
	if (!new_name)
		return NULL;

	/*
	 * Make sure we hit the realloc case the first time through the
	 * loop.  'len' will be strlen(name) + 3 at that point which is
	 * enough space for "name-X" and the trailing NUL.
	 */
	len = strlen(name) + 2;
	max = 1;
	dup = 1;

	for (;;) {
		struct kobject *dup_slot;
		dup_slot = kset_find_obj(pci_slots_kset, new_name);
		if (!dup_slot)
			break;
		kobject_put(dup_slot);
		if (dup == max) {
			len++;
			max *= 10;
			kfree(new_name);
			new_name = kmalloc(len, GFP_KERNEL);
			if (!new_name)
				break;
		}
		sprintf(new_name, "%s-%d", name, dup++);
	}

	return new_name;
}

static int rename_slot(struct pci_slot *slot, const char *name)
{
	int result = 0;
	char *slot_name;

	if (strcmp(pci_slot_name(slot), name) == 0)
		return result;

	slot_name = make_slot_name(name);
	if (!slot_name)
		return -ENOMEM;

	result = kobject_rename(&slot->kobj, slot_name);
	kfree(slot_name);

	return result;
}

static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr)
{
	struct pci_slot *slot;
	/*
	 * We already hold pci_bus_sem so don't worry
	 */
	list_for_each_entry(slot, &parent->slots, list)
		if (slot->number == slot_nr) {
			kobject_get(&slot->kobj);
			return slot;
		}

	return NULL;
}

/**
 * pci_create_slot - create or increment refcount for physical PCI slot
 * @parent: struct pci_bus of parent bridge
 * @slot_nr: PCI_SLOT(pci_dev->devfn) or -1 for placeholder
 * @name: user visible string presented in /sys/bus/pci/slots/<name>
 * @hotplug: set if caller is hotplug driver, NULL otherwise
 *
 * PCI slots have first class attributes such as address, speed, width,
 * and a &struct pci_slot is used to manage them. This interface will
 * either return a new &struct pci_slot to the caller, or if the pci_slot
 * already exists, its refcount will be incremented.
 *
 * Slots are uniquely identified by a @pci_bus, @slot_nr tuple.
 *
 * There are known platforms with broken firmware that assign the same
 * name to multiple slots. Workaround these broken platforms by renaming
 * the slots on behalf of the caller. If firmware assigns name N to
 * multiple slots:
 *
 * The first slot is assigned N
 * The second slot is assigned N-1
 * The third slot is assigned N-2
 * etc.
 *
 * Placeholder slots:
 * In most cases, @pci_bus, @slot_nr will be sufficient to uniquely identify
 * a slot. There is one notable exception - pSeries (rpaphp), where the
 * @slot_nr cannot be determined until a device is actually inserted into
 * the slot. In this scenario, the caller may pass -1 for @slot_nr.
 *
 * The following semantics are imposed when the caller passes @slot_nr ==
 * -1. First, we no longer check for an existing %struct pci_slot, as there
 * may be many slots with @slot_nr of -1.  The other change in semantics is
 * user-visible, which is the 'address' parameter presented in sysfs will
 * consist solely of a dddd:bb tuple, where dddd is the PCI domain of the
 * %struct pci_bus and bb is the bus number. In other words, the devfn of
 * the 'placeholder' slot will not be displayed.
 */
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
				 const char *name,
				 struct hotplug_slot *hotplug)
{
	struct pci_dev *dev;
	struct pci_slot *slot;
	int err = 0;
	char *slot_name = NULL;

	down_write(&pci_bus_sem);

	if (slot_nr == -1)
		goto placeholder;

	/*
	 * Hotplug drivers are allowed to rename an existing slot,
	 * but only if not already claimed.
	 */
	slot = get_slot(parent, slot_nr);
	if (slot) {
		if (hotplug) {
			if ((err = slot->hotplug ? -EBUSY : 0)
			     || (err = rename_slot(slot, name))) {
				kobject_put(&slot->kobj);
				slot = NULL;
				goto err;
			}
		}
		goto out;
	}

placeholder:
	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	if (!slot) {
		err = -ENOMEM;
		goto err;
	}

	slot->bus = parent;
	slot->number = slot_nr;

	slot->kobj.kset = pci_slots_kset;

	slot_name = make_slot_name(name);
	if (!slot_name) {
		err = -ENOMEM;
		goto err;
	}

	err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL,
				   "%s", slot_name);
	if (err)
		goto err;

	INIT_LIST_HEAD(&slot->list);
	list_add(&slot->list, &parent->slots);

	list_for_each_entry(dev, &parent->devices, bus_list)
		if (PCI_SLOT(dev->devfn) == slot_nr)
			dev->slot = slot;

	dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n",
		slot_nr, pci_slot_name(slot));

out:
	kfree(slot_name);
	up_write(&pci_bus_sem);
	return slot;
err:
	kfree(slot);
	slot = ERR_PTR(err);
	goto out;
}
EXPORT_SYMBOL_GPL(pci_create_slot);

/**
 * pci_renumber_slot - update %struct pci_slot -> number
 * @slot: &struct pci_slot to update
 * @slot_nr: new number for slot
 *
 * The primary purpose of this interface is to allow callers who earlier
 * created a placeholder slot in pci_create_slot() by passing a -1 as
 * slot_nr, to update their %struct pci_slot with the correct @slot_nr.
 */
void pci_renumber_slot(struct pci_slot *slot, int slot_nr)
{
	struct pci_slot *tmp;

	down_write(&pci_bus_sem);

	list_for_each_entry(tmp, &slot->bus->slots, list) {
		WARN_ON(tmp->number == slot_nr);
		goto out;
	}

	slot->number = slot_nr;
out:
	up_write(&pci_bus_sem);
}
EXPORT_SYMBOL_GPL(pci_renumber_slot);

/**
 * pci_destroy_slot - decrement refcount for physical PCI slot
 * @slot: struct pci_slot to decrement
 *
 * %struct pci_slot is refcounted, so destroying them is really easy; we
 * just call kobject_put on its kobj and let our release methods do the
 * rest.
 */
void pci_destroy_slot(struct pci_slot *slot)
{
	dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n",
		slot->number, atomic_read(&slot->kobj.kref.refcount) - 1);

	down_write(&pci_bus_sem);
	kobject_put(&slot->kobj);
	up_write(&pci_bus_sem);
}
EXPORT_SYMBOL_GPL(pci_destroy_slot);

#if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)
#include <linux/pci_hotplug.h>
/**
 * pci_hp_create_link - create symbolic link to the hotplug driver module.
 * @pci_slot: struct pci_slot
 *
 * Helper function for pci_hotplug_core.c to create symbolic link to
 * the hotplug driver module.
 */
void pci_hp_create_module_link(struct pci_slot *pci_slot)
{
	struct hotplug_slot *slot = pci_slot->hotplug;
	struct kobject *kobj = NULL;
	int ret;

	if (!slot || !slot->ops)
		return;
	kobj = kset_find_obj(module_kset, slot->ops->mod_name);
	if (!kobj)
		return;
	ret = sysfs_create_link(&pci_slot->kobj, kobj, "module");
	if (ret)
		dev_err(&pci_slot->bus->dev, "Error creating sysfs link (%d)\n",
			ret);
	kobject_put(kobj);
}
EXPORT_SYMBOL_GPL(pci_hp_create_module_link);

/**
 * pci_hp_remove_link - remove symbolic link to the hotplug driver module.
 * @pci_slot: struct pci_slot
 *
 * Helper function for pci_hotplug_core.c to remove symbolic link to
 * the hotplug driver module.
 */
void pci_hp_remove_module_link(struct pci_slot *pci_slot)
{
	sysfs_remove_link(&pci_slot->kobj, "module");
}
EXPORT_SYMBOL_GPL(pci_hp_remove_module_link);
#endif

static int pci_slot_init(void)
{
	struct kset *pci_bus_kset;

	pci_bus_kset = bus_get_kset(&pci_bus_type);
	pci_slots_kset = kset_create_and_add("slots", NULL,
						&pci_bus_kset->kobj);
	if (!pci_slots_kset) {
		printk(KERN_ERR "PCI: Slot initialization failure\n");
		return -ENOMEM;
	}
	return 0;
}

subsys_initcall(pci_slot_init);
Commit	Line	Data
f46753c5 AC	1	/*
	2	* drivers/pci/slot.c
	3	* Copyright (C) 2006 Matthew Wilcox <matthew@wil.cx>
62795041 AC	4	* Copyright (C) 2006-2009 Hewlett-Packard Development Company, L.P.
62795041 AC	5	* Alex Chiang <achiang@hp.com>
f46753c5 AC	6	*/
	7
	8	#include <linux/kobject.h>
5a0e3ad6	9	#include <linux/slab.h>
eefa9cfc	10	#include <linux/module.h>
f46753c5 AC	11	#include <linux/pci.h>
	12	#include <linux/err.h>
	13	#include "pci.h"
	14
	15	struct kset *pci_slots_kset;
	16	EXPORT_SYMBOL_GPL(pci_slots_kset);
	17
	18	static ssize_t pci_slot_attr_show(struct kobject *kobj,
	19	struct attribute attr, char buf)
	20	{
	21	struct pci_slot *slot = to_pci_slot(kobj);
	22	struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
	23	return attribute->show ? attribute->show(slot, buf) : -EIO;
	24	}
	25
	26	static ssize_t pci_slot_attr_store(struct kobject *kobj,
	27	struct attribute attr, const char buf, size_t len)
	28	{
	29	struct pci_slot *slot = to_pci_slot(kobj);
	30	struct pci_slot_attribute *attribute = to_pci_slot_attr(attr);
	31	return attribute->store ? attribute->store(slot, buf, len) : -EIO;
	32	}
	33
52cf25d0	34	static const struct sysfs_ops pci_slot_sysfs_ops = {
f46753c5 AC	35	.show = pci_slot_attr_show,
	36	.store = pci_slot_attr_store,
	37	};
	38
	39	static ssize_t address_read_file(struct pci_slot slot, char buf)
	40	{
	41	if (slot->number == 0xff)
	42	return sprintf(buf, "%04x:%02x\n",
	43	pci_domain_nr(slot->bus),
	44	slot->bus->number);
	45	else
	46	return sprintf(buf, "%04x:%02x:%02x\n",
	47	pci_domain_nr(slot->bus),
	48	slot->bus->number,
	49	slot->number);
	50	}
	51
3749c51a	52	/* these strings match up with the values in pci_bus_speed */
17134d96	53	static const char *pci_bus_speed_strings[] = {
3749c51a MW	54	"33 MHz PCI", /* 0x00 */
	55	"66 MHz PCI", /* 0x01 */
	56	"66 MHz PCI-X", /* 0x02 */
	57	"100 MHz PCI-X", /* 0x03 */
	58	"133 MHz PCI-X", /* 0x04 */
	59	NULL, /* 0x05 */
	60	NULL, /* 0x06 */
	61	NULL, /* 0x07 */
	62	NULL, /* 0x08 */
	63	"66 MHz PCI-X 266", /* 0x09 */
	64	"100 MHz PCI-X 266", /* 0x0a */
	65	"133 MHz PCI-X 266", /* 0x0b */
45b4cdd5 MW	66	"Unknown AGP", /* 0x0c */
	67	"1x AGP", /* 0x0d */
	68	"2x AGP", /* 0x0e */
	69	"4x AGP", /* 0x0f */
	70	"8x AGP", /* 0x10 */
3749c51a MW	71	"66 MHz PCI-X 533", /* 0x11 */
	72	"100 MHz PCI-X 533", /* 0x12 */
	73	"133 MHz PCI-X 533", /* 0x13 */
	74	"2.5 GT/s PCIe", /* 0x14 */
	75	"5.0 GT/s PCIe", /* 0x15 */
9dfd97fe	76	"8.0 GT/s PCIe", /* 0x16 */
3749c51a MW	77	};
	78
	79	static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)
	80	{
	81	const char *speed_string;
	82
	83	if (speed < ARRAY_SIZE(pci_bus_speed_strings))
	84	speed_string = pci_bus_speed_strings[speed];
	85	else
	86	speed_string = "Unknown";
	87
	88	return sprintf(buf, "%s\n", speed_string);
	89	}
	90
	91	static ssize_t max_speed_read_file(struct pci_slot slot, char buf)
	92	{
	93	return bus_speed_read(slot->bus->max_bus_speed, buf);
	94	}
	95
	96	static ssize_t cur_speed_read_file(struct pci_slot slot, char buf)
	97	{
	98	return bus_speed_read(slot->bus->cur_bus_speed, buf);
	99	}
	100
f46753c5 AC	101	static void pci_slot_release(struct kobject *kobj)
f46753c5 AC	102	{
cef354db	103	struct pci_dev *dev;
f46753c5 AC	104	struct pci_slot *slot = to_pci_slot(kobj);
f46753c5 AC	105
62795041 AC	106	dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n",
62795041 AC	107	slot->number, pci_slot_name(slot));
f46753c5	108
cef354db AC	109	list_for_each_entry(dev, &slot->bus->devices, bus_list)
	110	if (PCI_SLOT(dev->devfn) == slot->number)
	111	dev->slot = NULL;
	112
f46753c5 AC	113	list_del(&slot->list);
	114
	115	kfree(slot);
	116	}
	117
	118	static struct pci_slot_attribute pci_slot_attr_address =
	119	__ATTR(address, (S_IFREG \| S_IRUGO), address_read_file, NULL);
3749c51a MW	120	static struct pci_slot_attribute pci_slot_attr_max_speed =
	121	__ATTR(max_bus_speed, (S_IFREG \| S_IRUGO), max_speed_read_file, NULL);
	122	static struct pci_slot_attribute pci_slot_attr_cur_speed =
	123	__ATTR(cur_bus_speed, (S_IFREG \| S_IRUGO), cur_speed_read_file, NULL);
f46753c5 AC	124
	125	static struct attribute *pci_slot_default_attrs[] = {
	126	&pci_slot_attr_address.attr,
3749c51a MW	127	&pci_slot_attr_max_speed.attr,
3749c51a MW	128	&pci_slot_attr_cur_speed.attr,
f46753c5 AC	129	NULL,
	130	};
	131
	132	static struct kobj_type pci_slot_ktype = {
	133	.sysfs_ops = &pci_slot_sysfs_ops,
	134	.release = &pci_slot_release,
	135	.default_attrs = pci_slot_default_attrs,
	136	};
	137
5fe6cc60 AC	138	static char make_slot_name(const char name)
	139	{
	140	char *new_name;
	141	int len, max, dup;
	142
	143	new_name = kstrdup(name, GFP_KERNEL);
	144	if (!new_name)
	145	return NULL;
	146
	147	/*
	148	* Make sure we hit the realloc case the first time through the
	149	* loop. 'len' will be strlen(name) + 3 at that point which is
	150	* enough space for "name-X" and the trailing NUL.
	151	*/
	152	len = strlen(name) + 2;
	153	max = 1;
	154	dup = 1;
	155
	156	for (;;) {
	157	struct kobject *dup_slot;
	158	dup_slot = kset_find_obj(pci_slots_kset, new_name);
	159	if (!dup_slot)
	160	break;
	161	kobject_put(dup_slot);
	162	if (dup == max) {
	163	len++;
	164	max *= 10;
	165	kfree(new_name);
	166	new_name = kmalloc(len, GFP_KERNEL);
	167	if (!new_name)
	168	break;
	169	}
	170	sprintf(new_name, "%s-%d", name, dup++);
	171	}
	172
	173	return new_name;
	174	}
	175
	176	static int rename_slot(struct pci_slot slot, const char name)
	177	{
	178	int result = 0;
	179	char *slot_name;
	180
0ad772ec	181	if (strcmp(pci_slot_name(slot), name) == 0)
5fe6cc60 AC	182	return result;
	183
	184	slot_name = make_slot_name(name);
	185	if (!slot_name)
	186	return -ENOMEM;
	187
	188	result = kobject_rename(&slot->kobj, slot_name);
	189	kfree(slot_name);
	190
	191	return result;
	192	}
	193
	194	static struct pci_slot get_slot(struct pci_bus parent, int slot_nr)
	195	{
	196	struct pci_slot *slot;
	197	/*
	198	* We already hold pci_bus_sem so don't worry
	199	*/
	200	list_for_each_entry(slot, &parent->slots, list)
	201	if (slot->number == slot_nr) {
	202	kobject_get(&slot->kobj);
	203	return slot;
	204	}
	205
	206	return NULL;
	207	}
	208
f46753c5 AC	209	/**
	210	* pci_create_slot - create or increment refcount for physical PCI slot
	211	* @parent: struct pci_bus of parent bridge
	212	* @slot_nr: PCI_SLOT(pci_dev->devfn) or -1 for placeholder
	213	* @name: user visible string presented in /sys/bus/pci/slots/<name>
828f3768	214	* @hotplug: set if caller is hotplug driver, NULL otherwise
f46753c5 AC	215	*
	216	* PCI slots have first class attributes such as address, speed, width,
	217	* and a &struct pci_slot is used to manage them. This interface will
	218	* either return a new &struct pci_slot to the caller, or if the pci_slot
	219	* already exists, its refcount will be incremented.
	220	*
5fe6cc60 AC	221	* Slots are uniquely identified by a @pci_bus, @slot_nr tuple.
	222	*
	223	* There are known platforms with broken firmware that assign the same
	224	* name to multiple slots. Workaround these broken platforms by renaming
	225	* the slots on behalf of the caller. If firmware assigns name N to
	226	* multiple slots:
	227	*
	228	* The first slot is assigned N
	229	* The second slot is assigned N-1
	230	* The third slot is assigned N-2
	231	* etc.
f46753c5 AC	232	*
	233	* Placeholder slots:
	234	* In most cases, @pci_bus, @slot_nr will be sufficient to uniquely identify
	235	* a slot. There is one notable exception - pSeries (rpaphp), where the
	236	* @slot_nr cannot be determined until a device is actually inserted into
	237	* the slot. In this scenario, the caller may pass -1 for @slot_nr.
	238	*
	239	* The following semantics are imposed when the caller passes @slot_nr ==
5fe6cc60 AC	240	* -1. First, we no longer check for an existing %struct pci_slot, as there
5fe6cc60 AC	241	* may be many slots with @slot_nr of -1. The other change in semantics is
f46753c5 AC	242	* user-visible, which is the 'address' parameter presented in sysfs will
	243	* consist solely of a dddd:bb tuple, where dddd is the PCI domain of the
	244	* %struct pci_bus and bb is the bus number. In other words, the devfn of
	245	* the 'placeholder' slot will not be displayed.
	246	*/
f46753c5	247	struct pci_slot pci_create_slot(struct pci_bus parent, int slot_nr,
828f3768 AC	248	const char *name,
828f3768 AC	249	struct hotplug_slot *hotplug)
f46753c5	250	{
cef354db	251	struct pci_dev *dev;
f46753c5	252	struct pci_slot *slot;
5fe6cc60 AC	253	int err = 0;
5fe6cc60 AC	254	char *slot_name = NULL;
f46753c5 AC	255
	256	down_write(&pci_bus_sem);
	257
	258	if (slot_nr == -1)
	259	goto placeholder;
	260
5fe6cc60 AC	261	/*
	262	* Hotplug drivers are allowed to rename an existing slot,
	263	* but only if not already claimed.
	264	*/
	265	slot = get_slot(parent, slot_nr);
	266	if (slot) {
	267	if (hotplug) {
	268	if ((err = slot->hotplug ? -EBUSY : 0)
	269	\|\| (err = rename_slot(slot, name))) {
	270	kobject_put(&slot->kobj);
	271	slot = NULL;
	272	goto err;
	273	}
f46753c5	274	}
5fe6cc60	275	goto out;
f46753c5 AC	276	}
	277
	278	placeholder:
	279	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	280	if (!slot) {
5fe6cc60 AC	281	err = -ENOMEM;
5fe6cc60 AC	282	goto err;
f46753c5 AC	283	}
	284
	285	slot->bus = parent;
	286	slot->number = slot_nr;
	287
	288	slot->kobj.kset = pci_slots_kset;
5fe6cc60 AC	289
	290	slot_name = make_slot_name(name);
	291	if (!slot_name) {
	292	err = -ENOMEM;
f46753c5 AC	293	goto err;
	294	}
	295
5fe6cc60 AC	296	err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL,
	297	"%s", slot_name);
	298	if (err)
	299	goto err;
	300
f46753c5 AC	301	INIT_LIST_HEAD(&slot->list);
	302	list_add(&slot->list, &parent->slots);
	303
cef354db AC	304	list_for_each_entry(dev, &parent->devices, bus_list)
	305	if (PCI_SLOT(dev->devfn) == slot_nr)
	306	dev->slot = slot;
	307
62795041 AC	308	dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n",
62795041 AC	309	slot_nr, pci_slot_name(slot));
f46753c5	310
5fe6cc60	311	out:
3b5dd45e	312	kfree(slot_name);
f46753c5 AC	313	up_write(&pci_bus_sem);
f46753c5 AC	314	return slot;
5fe6cc60	315	err:
f46753c5 AC	316	kfree(slot);
	317	slot = ERR_PTR(err);
	318	goto out;
	319	}
	320	EXPORT_SYMBOL_GPL(pci_create_slot);
	321
	322	/**
d25b7c8d	323	* pci_renumber_slot - update %struct pci_slot -> number
cffb2faf RD	324	* @slot: &struct pci_slot to update
cffb2faf RD	325	* @slot_nr: new number for slot
f46753c5 AC	326	*
	327	* The primary purpose of this interface is to allow callers who earlier
	328	* created a placeholder slot in pci_create_slot() by passing a -1 as
	329	* slot_nr, to update their %struct pci_slot with the correct @slot_nr.
	330	*/
d25b7c8d	331	void pci_renumber_slot(struct pci_slot *slot, int slot_nr)
f46753c5	332	{
f46753c5 AC	333	struct pci_slot *tmp;
	334
	335	down_write(&pci_bus_sem);
	336
	337	list_for_each_entry(tmp, &slot->bus->slots, list) {
	338	WARN_ON(tmp->number == slot_nr);
d25b7c8d	339	goto out;
f46753c5 AC	340	}
f46753c5 AC	341
f46753c5	342	slot->number = slot_nr;
d25b7c8d	343	out:
f46753c5 AC	344	up_write(&pci_bus_sem);
f46753c5 AC	345	}
d25b7c8d	346	EXPORT_SYMBOL_GPL(pci_renumber_slot);
f46753c5 AC	347
	348	/**
	349	* pci_destroy_slot - decrement refcount for physical PCI slot
	350	* @slot: struct pci_slot to decrement
	351	*
	352	* %struct pci_slot is refcounted, so destroying them is really easy; we
	353	* just call kobject_put on its kobj and let our release methods do the
	354	* rest.
	355	*/
f46753c5 AC	356	void pci_destroy_slot(struct pci_slot *slot)
f46753c5 AC	357	{
62795041 AC	358	dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n",
62795041 AC	359	slot->number, atomic_read(&slot->kobj.kref.refcount) - 1);
f46753c5 AC	360
	361	down_write(&pci_bus_sem);
	362	kobject_put(&slot->kobj);
	363	up_write(&pci_bus_sem);
	364	}
	365	EXPORT_SYMBOL_GPL(pci_destroy_slot);
	366
c825bc94 KK	367	#if defined(CONFIG_HOTPLUG_PCI) \|\| defined(CONFIG_HOTPLUG_PCI_MODULE)
	368	#include <linux/pci_hotplug.h>
	369	/**
	370	* pci_hp_create_link - create symbolic link to the hotplug driver module.
503998ca	371	* @pci_slot: struct pci_slot
c825bc94 KK	372	*
	373	* Helper function for pci_hotplug_core.c to create symbolic link to
	374	* the hotplug driver module.
	375	*/
	376	void pci_hp_create_module_link(struct pci_slot *pci_slot)
	377	{
	378	struct hotplug_slot *slot = pci_slot->hotplug;
	379	struct kobject *kobj = NULL;
9fc9eea0	380	int ret;
c825bc94 KK	381
	382	if (!slot \|\| !slot->ops)
	383	return;
	384	kobj = kset_find_obj(module_kset, slot->ops->mod_name);
	385	if (!kobj)
	386	return;
9fc9eea0 BH	387	ret = sysfs_create_link(&pci_slot->kobj, kobj, "module");
	388	if (ret)
	389	dev_err(&pci_slot->bus->dev, "Error creating sysfs link (%d)\n",
	390	ret);
c825bc94 KK	391	kobject_put(kobj);
	392	}
	393	EXPORT_SYMBOL_GPL(pci_hp_create_module_link);
	394
	395	/**
	396	* pci_hp_remove_link - remove symbolic link to the hotplug driver module.
503998ca	397	* @pci_slot: struct pci_slot
c825bc94 KK	398	*
	399	* Helper function for pci_hotplug_core.c to remove symbolic link to
	400	* the hotplug driver module.
	401	*/
	402	void pci_hp_remove_module_link(struct pci_slot *pci_slot)
	403	{
	404	sysfs_remove_link(&pci_slot->kobj, "module");
	405	}
	406	EXPORT_SYMBOL_GPL(pci_hp_remove_module_link);
	407	#endif
	408
f46753c5 AC	409	static int pci_slot_init(void)
	410	{
	411	struct kset *pci_bus_kset;
	412
	413	pci_bus_kset = bus_get_kset(&pci_bus_type);
	414	pci_slots_kset = kset_create_and_add("slots", NULL,
	415	&pci_bus_kset->kobj);
	416	if (!pci_slots_kset) {
	417	printk(KERN_ERR "PCI: Slot initialization failure\n");
	418	return -ENOMEM;
	419	}
	420	return 0;
	421	}
	422
	423	subsys_initcall(pci_slot_init);