[mirror_ubuntu-bionic-kernel.git] / drivers / pci / hotplug / fakephp.c

/*
 * Fake PCI Hot Plug Controller Driver
 *
 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2003 IBM Corp.
 * Copyright (C) 2003 Rolf Eike Beer <eike-kernel@sf-tec.de>
 *
 * Based on ideas and code from:
 * 	Vladimir Kondratiev <vladimir.kondratiev@intel.com>
 *	Rolf Eike Beer <eike-kernel@sf-tec.de>
 *
 * 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, version 2 of the License.
 *
 * Send feedback to <greg@kroah.com>
 */

/*
 *
 * This driver will "emulate" removing PCI devices from the system.  If
 * the "power" file is written to with "0" then the specified PCI device
 * will be completely removed from the kernel.
 *
 * WARNING, this does NOT turn off the power to the PCI device.  This is
 * a "logical" removal, not a physical or electrical removal.
 *
 * Use this module at your own risk, you have been warned!
 *
 * Enabling PCI devices is left as an exercise for the reader...
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "../pci.h"

#if !defined(MODULE)
	#define MY_NAME	"fakephp"
#else
	#define MY_NAME	THIS_MODULE->name
#endif

#define dbg(format, arg...)					\
	do {							\
		if (debug)					\
			printk(KERN_DEBUG "%s: " format,	\
				MY_NAME , ## arg); 		\
	} while (0)
#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 DRIVER_AUTHOR	"Greg Kroah-Hartman <greg@kroah.com>"
#define DRIVER_DESC	"Fake PCI Hot Plug Controller Driver"

struct dummy_slot {
	struct list_head node;
	struct hotplug_slot *slot;
	struct pci_dev *dev;
	struct work_struct remove_work;
	unsigned long removed;
};

static int debug;
static int dup_slots;
static LIST_HEAD(slot_list);
static struct workqueue_struct *dummyphp_wq;

static void pci_rescan_worker(struct work_struct *work);
static DECLARE_WORK(pci_rescan_work, pci_rescan_worker);

static int enable_slot (struct hotplug_slot *slot);
static int disable_slot (struct hotplug_slot *slot);

static struct hotplug_slot_ops dummy_hotplug_slot_ops = {
	.owner			= THIS_MODULE,
	.enable_slot		= enable_slot,
	.disable_slot		= disable_slot,
};

static void dummy_release(struct hotplug_slot *slot)
{
	struct dummy_slot *dslot = slot->private;

	list_del(&dslot->node);
	kfree(dslot->slot->info);
	kfree(dslot->slot);
	pci_dev_put(dslot->dev);
	kfree(dslot);
}

#define SLOT_NAME_SIZE	8

static int add_slot(struct pci_dev *dev)
{
	struct dummy_slot *dslot;
	struct hotplug_slot *slot;
	char name[SLOT_NAME_SIZE];
	int retval = -ENOMEM;
	static int count = 1;

	slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
	if (!slot)
		goto error;

	slot->info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
	if (!slot->info)
		goto error_slot;

	slot->info->power_status = 1;
	slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
	slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;

	dslot = kzalloc(sizeof(struct dummy_slot), GFP_KERNEL);
	if (!dslot)
		goto error_info;

	if (dup_slots)
		snprintf(name, SLOT_NAME_SIZE, "fake");
	else
		snprintf(name, SLOT_NAME_SIZE, "fake%d", count++);
	dbg("slot->name = %s\n", name);
	slot->ops = &dummy_hotplug_slot_ops;
	slot->release = &dummy_release;
	slot->private = dslot;

	retval = pci_hp_register(slot, dev->bus, PCI_SLOT(dev->devfn), name);
	if (retval) {
		err("pci_hp_register failed with error %d\n", retval);
		goto error_dslot;
	}

	dbg("slot->name = %s\n", hotplug_slot_name(slot));
	dslot->slot = slot;
	dslot->dev = pci_dev_get(dev);
	list_add (&dslot->node, &slot_list);
	return retval;

error_dslot:
	kfree(dslot);
error_info:
	kfree(slot->info);
error_slot:
	kfree(slot);
error:
	return retval;
}

static int __init pci_scan_buses(void)
{
	struct pci_dev *dev = NULL;
	int lastslot = 0;

	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
		if (PCI_FUNC(dev->devfn) > 0 &&
				lastslot == PCI_SLOT(dev->devfn))
			continue;
		lastslot = PCI_SLOT(dev->devfn);
		add_slot(dev);
	}

	return 0;
}

static void remove_slot(struct dummy_slot *dslot)
{
	int retval;

	dbg("removing slot %s\n", hotplug_slot_name(dslot->slot));
	retval = pci_hp_deregister(dslot->slot);
	if (retval)
		err("Problem unregistering a slot %s\n",
			hotplug_slot_name(dslot->slot));
}

/* called from the single-threaded workqueue handler to remove a slot */
static void remove_slot_worker(struct work_struct *work)
{
	struct dummy_slot *dslot =
		container_of(work, struct dummy_slot, remove_work);
	remove_slot(dslot);
}

/**
 * pci_rescan_slot - Rescan slot
 * @temp: Device template. Should be set: bus and devfn.
 *
 * Tries hard not to re-enable already existing devices;
 * also handles scanning of subfunctions.
 */
static int pci_rescan_slot(struct pci_dev *temp)
{
	struct pci_bus *bus = temp->bus;
	struct pci_dev *dev;
	int func;
	u8 hdr_type;
	int count = 0;

	if (!pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type)) {
		temp->hdr_type = hdr_type & 0x7f;
		if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
			pci_dev_put(dev);
		else {
			dev = pci_scan_single_device(bus, temp->devfn);
			if (dev) {
				dbg("New device on %s function %x:%x\n",
					bus->name, temp->devfn >> 3,
					temp->devfn & 7);
				count++;
			}
		}
		/* multifunction device? */
		if (!(hdr_type & 0x80))
			return count;

		/* continue scanning for other functions */
		for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
			if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
				continue;
			temp->hdr_type = hdr_type & 0x7f;

			if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
				pci_dev_put(dev);
			else {
				dev = pci_scan_single_device(bus, temp->devfn);
				if (dev) {
					dbg("New device on %s function %x:%x\n",
						bus->name, temp->devfn >> 3,
						temp->devfn & 7);
					count++;
				}
			}
		}
	}

	return count;
}


/**
 * pci_rescan_bus - Rescan PCI bus
 * @bus: the PCI bus to rescan
 *
 * Call pci_rescan_slot for each possible function of the bus.
 */
static void pci_rescan_bus(const struct pci_bus *bus)
{
	unsigned int devfn;
	struct pci_dev *dev;
	int retval;
	int found = 0;
	dev = alloc_pci_dev();
	if (!dev)
		return;

	dev->bus = (struct pci_bus*)bus;
	dev->sysdata = bus->sysdata;
	for (devfn = 0; devfn < 0x100; devfn += 8) {
		dev->devfn = devfn;
		found += pci_rescan_slot(dev);
	}

	if (found) {
		pci_bus_assign_resources(bus);
		list_for_each_entry(dev, &bus->devices, bus_list) {
			/* Skip already-added devices */
			if (dev->is_added)
					continue;
			retval = pci_bus_add_device(dev);
			if (retval)
				dev_err(&dev->dev,
					"Error adding device, continuing\n");
			else
				add_slot(dev);
		}
		pci_bus_add_devices(bus);
	}
	kfree(dev);
}

/* recursively scan all buses */
static void pci_rescan_buses(const struct list_head *list)
{
	const struct list_head *l;
	list_for_each(l,list) {
		const struct pci_bus *b = pci_bus_b(l);
		pci_rescan_bus(b);
		pci_rescan_buses(&b->children);
	}
}

/* initiate rescan of all pci buses */
static inline void pci_rescan(void) {
	pci_rescan_buses(&pci_root_buses);
}

/* called from the single-threaded workqueue handler to rescan all pci buses */
static void pci_rescan_worker(struct work_struct *work)
{
	pci_rescan();
}

static int enable_slot(struct hotplug_slot *hotplug_slot)
{
	/* mis-use enable_slot for rescanning of the pci bus */
	cancel_work_sync(&pci_rescan_work);
	queue_work(dummyphp_wq, &pci_rescan_work);
	return 0;
}

static int disable_slot(struct hotplug_slot *slot)
{
	struct dummy_slot *dslot;
	struct pci_dev *dev;
	int func;

	if (!slot)
		return -ENODEV;
	dslot = slot->private;

	dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(slot));

	for (func = 7; func >= 0; func--) {
		dev = pci_get_slot(dslot->dev->bus, dslot->dev->devfn + func);
		if (!dev)
			continue;

		if (test_and_set_bit(0, &dslot->removed)) {
			dbg("Slot already scheduled for removal\n");
			pci_dev_put(dev);
			return -ENODEV;
		}

		/* remove the device from the pci core */
		pci_remove_bus_device(dev);

		/* queue work item to blow away this sysfs entry and other
		 * parts.
		 */
		INIT_WORK(&dslot->remove_work, remove_slot_worker);
		queue_work(dummyphp_wq, &dslot->remove_work);

		pci_dev_put(dev);
	}
	return 0;
}

static void cleanup_slots (void)
{
	struct list_head *tmp;
	struct list_head *next;
	struct dummy_slot *dslot;

	destroy_workqueue(dummyphp_wq);
	list_for_each_safe (tmp, next, &slot_list) {
		dslot = list_entry (tmp, struct dummy_slot, node);
		remove_slot(dslot);
	}
	
}

static int __init dummyphp_init(void)
{
	info(DRIVER_DESC "\n");

	dummyphp_wq = create_singlethread_workqueue(MY_NAME);
	if (!dummyphp_wq)
		return -ENOMEM;

	return pci_scan_buses();
}


static void __exit dummyphp_exit(void)
{
	cleanup_slots();
}

module_init(dummyphp_init);
module_exit(dummyphp_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
module_param(dup_slots, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dup_slots, "Force duplicate slot names for debugging");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Fake PCI Hot Plug Controller Driver
	3	*
	4	* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
	5	* Copyright (C) 2003 IBM Corp.
	6	* Copyright (C) 2003 Rolf Eike Beer <eike-kernel@sf-tec.de>
	7	*
	8	* Based on ideas and code from:
	9	* Vladimir Kondratiev <vladimir.kondratiev@intel.com>
	10	* Rolf Eike Beer <eike-kernel@sf-tec.de>
	11	*
	12	* All rights reserved.
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation, version 2 of the License.
	17	*
	18	* Send feedback to <greg@kroah.com>
	19	*/
	20
	21	/*
	22	*
	23	* This driver will "emulate" removing PCI devices from the system. If
	24	* the "power" file is written to with "0" then the specified PCI device
	25	* will be completely removed from the kernel.
	26	*
	27	* WARNING, this does NOT turn off the power to the PCI device. This is
	28	* a "logical" removal, not a physical or electrical removal.
	29	*
	30	* Use this module at your own risk, you have been warned!
	31	*
	32	* Enabling PCI devices is left as an exercise for the reader...
	33	*
	34	*/
1da177e4 LT	35	#include <linux/kernel.h>
	36	#include <linux/module.h>
	37	#include <linux/pci.h>
7a54f25c	38	#include <linux/pci_hotplug.h>
1da177e4	39	#include <linux/init.h>
4e57b681 TS	40	#include <linux/string.h>
4e57b681 TS	41	#include <linux/slab.h>
5c796ae7	42	#include <linux/workqueue.h>
1da177e4 LT	43	#include "../pci.h"
	44
	45	#if !defined(MODULE)
	46	#define MY_NAME "fakephp"
	47	#else
	48	#define MY_NAME THIS_MODULE->name
	49	#endif
	50
	51	#define dbg(format, arg...) \
	52	do { \
	53	if (debug) \
	54	printk(KERN_DEBUG "%s: " format, \
	55	MY_NAME , ## arg); \
	56	} while (0)
	57	#define err(format, arg...) printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
	58	#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
	59
	60	#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
	61	#define DRIVER_DESC "Fake PCI Hot Plug Controller Driver"
	62
	63	struct dummy_slot {
	64	struct list_head node;
	65	struct hotplug_slot *slot;
	66	struct pci_dev *dev;
5c796ae7 IA	67	struct work_struct remove_work;
5c796ae7 IA	68	unsigned long removed;
1da177e4 LT	69	};
	70
	71	static int debug;
0b8b0dca	72	static int dup_slots;
1da177e4	73	static LIST_HEAD(slot_list);
5c796ae7 IA	74	static struct workqueue_struct *dummyphp_wq;
	75
	76	static void pci_rescan_worker(struct work_struct *work);
	77	static DECLARE_WORK(pci_rescan_work, pci_rescan_worker);
1da177e4 LT	78
	79	static int enable_slot (struct hotplug_slot *slot);
	80	static int disable_slot (struct hotplug_slot *slot);
	81
	82	static struct hotplug_slot_ops dummy_hotplug_slot_ops = {
	83	.owner = THIS_MODULE,
	84	.enable_slot = enable_slot,
	85	.disable_slot = disable_slot,
	86	};
	87
	88	static void dummy_release(struct hotplug_slot *slot)
	89	{
	90	struct dummy_slot *dslot = slot->private;
	91
	92	list_del(&dslot->node);
	93	kfree(dslot->slot->info);
	94	kfree(dslot->slot);
	95	pci_dev_put(dslot->dev);
	96	kfree(dslot);
	97	}
	98
43caae88 AC	99	#define SLOT_NAME_SIZE 8
43caae88 AC	100
1da177e4 LT	101	static int add_slot(struct pci_dev *dev)
	102	{
	103	struct dummy_slot *dslot;
	104	struct hotplug_slot *slot;
43caae88	105	char name[SLOT_NAME_SIZE];
1da177e4	106	int retval = -ENOMEM;
fe99740c	107	static int count = 1;
1da177e4	108
f5afe806	109	slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
1da177e4 LT	110	if (!slot)
1da177e4 LT	111	goto error;
1da177e4	112
f5afe806	113	slot->info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
1da177e4 LT	114	if (!slot->info)
1da177e4 LT	115	goto error_slot;
1da177e4 LT	116
	117	slot->info->power_status = 1;
	118	slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
	119	slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
	120
5c796ae7	121	dslot = kzalloc(sizeof(struct dummy_slot), GFP_KERNEL);
1da177e4 LT	122	if (!dslot)
	123	goto error_info;
	124
0b8b0dca AC	125	if (dup_slots)
	126	snprintf(name, SLOT_NAME_SIZE, "fake");
	127	else
	128	snprintf(name, SLOT_NAME_SIZE, "fake%d", count++);
	129	dbg("slot->name = %s\n", name);
1da177e4 LT	130	slot->ops = &dummy_hotplug_slot_ops;
	131	slot->release = &dummy_release;
	132	slot->private = dslot;
	133
43caae88	134	retval = pci_hp_register(slot, dev->bus, PCI_SLOT(dev->devfn), name);
1da177e4 LT	135	if (retval) {
	136	err("pci_hp_register failed with error %d\n", retval);
	137	goto error_dslot;
	138	}
	139
43caae88	140	dbg("slot->name = %s\n", hotplug_slot_name(slot));
1da177e4 LT	141	dslot->slot = slot;
	142	dslot->dev = pci_dev_get(dev);
	143	list_add (&dslot->node, &slot_list);
	144	return retval;
	145
	146	error_dslot:
	147	kfree(dslot);
	148	error_info:
	149	kfree(slot->info);
	150	error_slot:
	151	kfree(slot);
	152	error:
	153	return retval;
	154	}
	155
	156	static int __init pci_scan_buses(void)
	157	{
	158	struct pci_dev *dev = NULL;
fe99740c	159	int lastslot = 0;
1da177e4 LT	160
1da177e4 LT	161	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
fe99740c AC	162	if (PCI_FUNC(dev->devfn) > 0 &&
	163	lastslot == PCI_SLOT(dev->devfn))
	164	continue;
	165	lastslot = PCI_SLOT(dev->devfn);
	166	add_slot(dev);
1da177e4 LT	167	}
1da177e4 LT	168
fe99740c	169	return 0;
1da177e4 LT	170	}
	171
	172	static void remove_slot(struct dummy_slot *dslot)
	173	{
	174	int retval;
	175
43caae88	176	dbg("removing slot %s\n", hotplug_slot_name(dslot->slot));
1da177e4 LT	177	retval = pci_hp_deregister(dslot->slot);
1da177e4 LT	178	if (retval)
43caae88 AC	179	err("Problem unregistering a slot %s\n",
43caae88 AC	180	hotplug_slot_name(dslot->slot));
1da177e4 LT	181	}
1da177e4 LT	182
5c796ae7 IA	183	/* called from the single-threaded workqueue handler to remove a slot */
	184	static void remove_slot_worker(struct work_struct *work)
	185	{
	186	struct dummy_slot *dslot =
	187	container_of(work, struct dummy_slot, remove_work);
	188	remove_slot(dslot);
	189	}
	190
1da177e4	191	/**
26e6c66e RD	192	* pci_rescan_slot - Rescan slot
26e6c66e RD	193	* @temp: Device template. Should be set: bus and devfn.
1da177e4	194	*
26e6c66e RD	195	* Tries hard not to re-enable already existing devices;
26e6c66e RD	196	* also handles scanning of subfunctions.
1da177e4	197	*/
bf4162bc	198	static int pci_rescan_slot(struct pci_dev *temp)
1da177e4 LT	199	{
	200	struct pci_bus *bus = temp->bus;
	201	struct pci_dev *dev;
	202	int func;
	203	u8 hdr_type;
bf4162bc	204	int count = 0;
b19441af	205
1da177e4 LT	206	if (!pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type)) {
1da177e4 LT	207	temp->hdr_type = hdr_type & 0x7f;
094ed76e AC	208	if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
	209	pci_dev_put(dev);
	210	else {
1da177e4 LT	211	dev = pci_scan_single_device(bus, temp->devfn);
	212	if (dev) {
	213	dbg("New device on %s function %x:%x\n",
	214	bus->name, temp->devfn >> 3,
	215	temp->devfn & 7);
bf4162bc	216	count++;
1da177e4 LT	217	}
	218	}
	219	/* multifunction device? */
	220	if (!(hdr_type & 0x80))
bf4162bc	221	return count;
1da177e4 LT	222
	223	/* continue scanning for other functions */
	224	for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
	225	if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
	226	continue;
	227	temp->hdr_type = hdr_type & 0x7f;
	228
094ed76e AC	229	if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
	230	pci_dev_put(dev);
	231	else {
1da177e4 LT	232	dev = pci_scan_single_device(bus, temp->devfn);
	233	if (dev) {
	234	dbg("New device on %s function %x:%x\n",
	235	bus->name, temp->devfn >> 3,
	236	temp->devfn & 7);
bf4162bc	237	count++;
1da177e4 LT	238	}
	239	}
	240	}
	241	}
bf4162bc DW	242
bf4162bc DW	243	return count;
1da177e4 LT	244	}
	245
	246
	247	/**
26e6c66e RD	248	* pci_rescan_bus - Rescan PCI bus
26e6c66e RD	249	* @bus: the PCI bus to rescan
1da177e4	250	*
26e6c66e	251	* Call pci_rescan_slot for each possible function of the bus.
1da177e4 LT	252	*/
	253	static void pci_rescan_bus(const struct pci_bus *bus)
	254	{
	255	unsigned int devfn;
	256	struct pci_dev *dev;
bf4162bc DW	257	int retval;
bf4162bc DW	258	int found = 0;
bab41e9b	259	dev = alloc_pci_dev();
1da177e4 LT	260	if (!dev)
	261	return;
	262
1da177e4 LT	263	dev->bus = (struct pci_bus*)bus;
	264	dev->sysdata = bus->sysdata;
	265	for (devfn = 0; devfn < 0x100; devfn += 8) {
	266	dev->devfn = devfn;
bf4162bc DW	267	found += pci_rescan_slot(dev);
	268	}
	269
	270	if (found) {
	271	pci_bus_assign_resources(bus);
	272	list_for_each_entry(dev, &bus->devices, bus_list) {
	273	/* Skip already-added devices */
	274	if (dev->is_added)
	275	continue;
	276	retval = pci_bus_add_device(dev);
	277	if (retval)
	278	dev_err(&dev->dev,
	279	"Error adding device, continuing\n");
	280	else
	281	add_slot(dev);
	282	}
	283	pci_bus_add_devices(bus);
1da177e4 LT	284	}
	285	kfree(dev);
	286	}
	287
	288	/* recursively scan all buses */
	289	static void pci_rescan_buses(const struct list_head *list)
	290	{
	291	const struct list_head *l;
	292	list_for_each(l,list) {
	293	const struct pci_bus *b = pci_bus_b(l);
	294	pci_rescan_bus(b);
	295	pci_rescan_buses(&b->children);
	296	}
	297	}
	298
	299	/* initiate rescan of all pci buses */
	300	static inline void pci_rescan(void) {
	301	pci_rescan_buses(&pci_root_buses);
	302	}
	303
5c796ae7 IA	304	/* called from the single-threaded workqueue handler to rescan all pci buses */
	305	static void pci_rescan_worker(struct work_struct *work)
	306	{
	307	pci_rescan();
	308	}
1da177e4 LT	309
	310	static int enable_slot(struct hotplug_slot *hotplug_slot)
	311	{
	312	/* mis-use enable_slot for rescanning of the pci bus */
5c796ae7 IA	313	cancel_work_sync(&pci_rescan_work);
5c796ae7 IA	314	queue_work(dummyphp_wq, &pci_rescan_work);
ca99eb8c	315	return 0;
1da177e4 LT	316	}
1da177e4 LT	317
1da177e4 LT	318	static int disable_slot(struct hotplug_slot *slot)
	319	{
	320	struct dummy_slot *dslot;
1da177e4 LT	321	struct pci_dev *dev;
	322	int func;
	323
	324	if (!slot)
	325	return -ENODEV;
	326	dslot = slot->private;
	327
43caae88	328	dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(slot));
1da177e4	329
fe99740c AC	330	for (func = 7; func >= 0; func--) {
	331	dev = pci_get_slot(dslot->dev->bus, dslot->dev->devfn + func);
	332	if (!dev)
	333	continue;
	334
	335	if (test_and_set_bit(0, &dslot->removed)) {
	336	dbg("Slot already scheduled for removal\n");
4ba7d0f0	337	pci_dev_put(dev);
fe99740c	338	return -ENODEV;
1da177e4	339	}
1da177e4	340
48902025 AC	341	/* remove the device from the pci core */
	342	pci_remove_bus_device(dev);
	343
fe99740c AC	344	/* queue work item to blow away this sysfs entry and other
	345	* parts.
	346	*/
	347	INIT_WORK(&dslot->remove_work, remove_slot_worker);
	348	queue_work(dummyphp_wq, &dslot->remove_work);
1da177e4	349
fe99740c AC	350	pci_dev_put(dev);
fe99740c AC	351	}
1da177e4 LT	352	return 0;
	353	}
	354
	355	static void cleanup_slots (void)
	356	{
	357	struct list_head *tmp;
	358	struct list_head *next;
	359	struct dummy_slot *dslot;
	360
5c796ae7	361	destroy_workqueue(dummyphp_wq);
1da177e4 LT	362	list_for_each_safe (tmp, next, &slot_list) {
	363	dslot = list_entry (tmp, struct dummy_slot, node);
	364	remove_slot(dslot);
	365	}
	366
	367	}
	368
	369	static int __init dummyphp_init(void)
	370	{
	371	info(DRIVER_DESC "\n");
	372
5c796ae7 IA	373	dummyphp_wq = create_singlethread_workqueue(MY_NAME);
	374	if (!dummyphp_wq)
	375	return -ENOMEM;
	376
1da177e4 LT	377	return pci_scan_buses();
	378	}
	379
	380
	381	static void __exit dummyphp_exit(void)
	382	{
	383	cleanup_slots();
	384	}
	385
	386	module_init(dummyphp_init);
	387	module_exit(dummyphp_exit);
	388
	389	MODULE_AUTHOR(DRIVER_AUTHOR);
	390	MODULE_DESCRIPTION(DRIVER_DESC);
	391	MODULE_LICENSE("GPL");
	392	module_param(debug, bool, S_IRUGO \| S_IWUSR);
	393	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
0b8b0dca AC	394	module_param(dup_slots, bool, S_IRUGO \| S_IWUSR);
0b8b0dca AC	395	MODULE_PARM_DESC(dup_slots, "Force duplicate slot names for debugging");