PCI/VGA: Fix typos

// SPDX-License-Identifier: MIT

/*

 * vgaarb.c: Implements the VGA arbitration. For details refer to

 * vgaarb.c: Implements VGA arbitration. For details refer to

 * Documentation/gpu/vgaarbiter.rst

 *

 * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>

#include <linux/vt.h>

#include <linux/console.h>

#include <linux/acpi.h>

#include <linux/uaccess.h>

#include <linux/vgaarb.h>

static void vga_arbiter_notify_clients(void);

/*

 * We keep a list of all vga devices in the system to speed

 * We keep a list of all VGA devices in the system to speed

 * up the various operations of the arbiter

 */

struct vga_device {

	struct list_head list;

	struct pci_dev *pdev;

	unsigned int decodes;	/* what does it decodes */

	unsigned int owns;	/* what does it owns */

	unsigned int locks;	/* what does it locks */

	unsigned int decodes;		/* what it decodes */

	unsigned int owns;		/* what it owns */

	unsigned int locks;		/* what it locks */

	unsigned int io_lock_cnt;	/* legacy IO lock count */

	unsigned int mem_lock_cnt;	/* legacy MEM lock count */

	unsigned int io_norm_cnt;	/* normal IO count */

static DEFINE_SPINLOCK(vga_lock);

static DECLARE_WAIT_QUEUE_HEAD(vga_wait_queue);

static const char *vga_iostate_to_str(unsigned int iostate)

{

	/* Ignore VGA_RSRC_IO and VGA_RSRC_MEM */

static int vga_str_to_iostate(char *buf, int str_size, unsigned int *io_state)

{

	/* we could in theory hand out locks on IO and mem

	 * separately to userspace but it can cause deadlocks */

	/*

	 * In theory, we could hand out locks on IO and MEM separately to

	 * userspace, but this can cause deadlocks.

	 */

	if (strncmp(buf, "none", 4) == 0) {

		*io_state = VGA_RSRC_NONE;

		return 1;

	}

	/* XXX We're not chekcing the str_size! */

	/* XXX We're not checking the str_size! */

	if (strncmp(buf, "io+mem", 6) == 0)

		goto both;

	else if (strncmp(buf, "io", 2) == 0)

	return 1;

}

/* this is only used a cookie - it should not be dereferenced */

/* This is only used as a cookie, it should not be dereferenced */

static struct pci_dev *vga_default;

/* Find somebody in our list */

/**

 * vga_default_device - return the default VGA device, for vgacon

 *

 * This can be defined by the platform. The default implementation

 * is rather dumb and will probably only work properly on single

 * vga card setups and/or x86 platforms.

 * This can be defined by the platform. The default implementation is

 * rather dumb and will probably only work properly on single VGA card

 * setups and/or x86 platforms.

 *

 * If your VGA default device is not PCI, you'll have to return

 * NULL here. In this case, I assume it will not conflict with

 * any PCI card. If this is not true, I'll have to define two archs

 * hooks for enabling/disabling the VGA default device if that is

 * possible. This may be a problem with real _ISA_ VGA cards, in

 * addition to a PCI one. I don't know at this point how to deal

 * with that card. Can theirs IOs be disabled at all ? If not, then

 * I suppose it's a matter of having the proper arch hook telling

 * us about it, so we basically never allow anybody to succeed a

 * vga_get()...

 * If your VGA default device is not PCI, you'll have to return NULL here.

 * In this case, I assume it will not conflict with any PCI card. If this

 * is not true, I'll have to define two arch hooks for enabling/disabling

 * the VGA default device if that is possible. This may be a problem with

 * real _ISA_ VGA cards, in addition to a PCI one. I don't know at this

 * point how to deal with that card. Can their IOs be disabled at all? If

 * not, then I suppose it's a matter of having the proper arch hook telling

 * us about it, so we basically never allow anybody to succeed a vga_get().

 */

struct pci_dev *vga_default_device(void)

{

}

/**

 * vga_remove_vgacon - deactivete vga console

 * vga_remove_vgacon - deactivate VGA console

 *

 * Unbind and unregister vgacon in case pdev is the default vga

 * device.  Can be called by gpu drivers on initialization to make

 * sure vga register access done by vgacon will not disturb the

 * device.

 * Unbind and unregister vgacon in case pdev is the default VGA device.

 * Can be called by GPU drivers on initialization to make sure VGA register

 * access done by vgacon will not disturb the device.

 *

 * @pdev: pci device.

 * @pdev: PCI device.

 */

#if !defined(CONFIG_VGA_CONSOLE)

int vga_remove_vgacon(struct pci_dev *pdev)

#endif

EXPORT_SYMBOL(vga_remove_vgacon);

/* If we don't ever use VGA arb we should avoid

   turning off anything anywhere due to old X servers getting

   confused about the boot device not being VGA */

/*

 * If we don't ever use VGA arbitration, we should avoid turning off

 * anything anywhere due to old X servers getting confused about the boot

 * device not being VGA.

 */

static void vga_check_first_use(void)

{

	/* we should inform all GPUs in the system that

	 * VGA arb has occurred and to try and disable resources

	 * if they can */

	/*

	 * Inform all GPUs in the system that VGA arbitration has occurred

	 * so they can disable resources if possible.

	 */

	if (!vga_arbiter_used) {

		vga_arbiter_used = true;

		vga_arbiter_notify_clients();

	unsigned int pci_bits;

	u32 flags = 0;

	/* Account for "normal" resources to lock. If we decode the legacy,

	/*

	 * Account for "normal" resources to lock. If we decode the legacy,

	 * counterpart, we need to request it as well

	 */

	if ((rsrc & VGA_RSRC_NORMAL_IO) &&

	if (wants == 0)

		goto lock_them;

	/* We don't need to request a legacy resource, we just enable

	 * appropriate decoding and go

	/*

	 * We don't need to request a legacy resource, we just enable

	 * appropriate decoding and go.

	 */

	legacy_wants = wants & VGA_RSRC_LEGACY_MASK;

	if (legacy_wants == 0)

		goto enable_them;

	/* Ok, we don't, let's find out how we need to kick off */

	/* Ok, we don't, let's find out who we need to kick off */

	list_for_each_entry(conflict, &vga_list, list) {

		unsigned int lwants = legacy_wants;

		unsigned int change_bridge = 0;

		if (vgadev == conflict)

			continue;

		/* We have a possible conflict. before we go further, we must

		/*

		 * We have a possible conflict. Before we go further, we must

		 * check if we sit on the same bus as the conflicting device.

		 * if we don't, then we must tie both IO and MEM resources

		 * If we don't, then we must tie both IO and MEM resources

		 * together since there is only a single bit controlling

		 * VGA forwarding on P2P bridges

		 * VGA forwarding on P2P bridges.

		 */

		if (vgadev->pdev->bus != conflict->pdev->bus) {

			change_bridge = 1;

			lwants = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;

		}

		/* Check if the guy has a lock on the resource. If he does,

		 * return the conflicting entry

		/*

		 * Check if the guy has a lock on the resource. If he does,

		 * return the conflicting entry.

		 */

		if (conflict->locks & lwants)

			return conflict;

		/* Ok, now check if it owns the resource we want.  We can

		 * lock resources that are not decoded, therefore a device

		/*

		 * Ok, now check if it owns the resource we want.  We can

		 * lock resources that are not decoded; therefore a device

		 * can own resources it doesn't decode.

		 */

		match = lwants & conflict->owns;

		if (!match)

			continue;

		/* looks like he doesn't have a lock, we can steal

		 * them from him

		/*

		 * Looks like he doesn't have a lock, we can steal them

		 * from him.

		 */

		flags = 0;

		pci_bits = 0;

		/* If we can't control legacy resources via the bridge, we

		/*

		 * If we can't control legacy resources via the bridge, we

		 * also need to disable normal decoding.

		 */

		if (!conflict->bridge_has_one_vga) {

	}

enable_them:

	/* ok dude, we got it, everybody conflicting has been disabled, let's

	/*

	 * Ok, we got it, everybody conflicting has been disabled, let's

	 * enable us.  Mark any bits in "owns" regardless of whether we

	 * decoded them.  We can lock resources we don't decode, therefore

	 * we must track them via "owns".

	vgaarb_dbg(dev, "%s\n", __func__);

	/* Update our counters, and account for equivalent legacy resources

	 * if we decode them

	/*

	 * Update our counters and account for equivalent legacy resources

	 * if we decode them.

	 */

	if ((rsrc & VGA_RSRC_NORMAL_IO) && vgadev->io_norm_cnt > 0) {

		vgadev->io_norm_cnt--;

	if ((rsrc & VGA_RSRC_LEGACY_MEM) && vgadev->mem_lock_cnt > 0)

		vgadev->mem_lock_cnt--;

	/* Just clear lock bits, we do lazy operations so we don't really

	 * have to bother about anything else at this point

	/*

	 * Just clear lock bits, we do lazy operations so we don't really

	 * have to bother about anything else at this point.

	 */

	if (vgadev->io_lock_cnt == 0)

		vgadev->locks &= ~VGA_RSRC_LEGACY_IO;

	if (vgadev->mem_lock_cnt == 0)

		vgadev->locks &= ~VGA_RSRC_LEGACY_MEM;

	/* Kick the wait queue in case somebody was waiting if we actually

	 * released something

	/*

	 * Kick the wait queue in case somebody was waiting if we actually

	 * released something.

	 */

	if (old_locks != vgadev->locks)

		wake_up_all(&vga_wait_queue);

}

/**

 * vga_get - acquire & locks VGA resources

 * @pdev: pci device of the VGA card or NULL for the system default

 * vga_get - acquire & lock VGA resources

 * @pdev: PCI device of the VGA card or NULL for the system default

 * @rsrc: bit mask of resources to acquire and lock

 * @interruptible: blocking should be interruptible by signals ?

 *

 * This function acquires VGA resources for the given card and mark those

 * resources locked. If the resource requested are "normal" (and not legacy)

 * Acquire VGA resources for the given card and mark those resources

 * locked. If the resources requested are "normal" (and not legacy)

 * resources, the arbiter will first check whether the card is doing legacy

 * decoding for that type of resource. If yes, the lock is "converted" into a

 * legacy resource lock.

 * decoding for that type of resource. If yes, the lock is "converted" into

 * a legacy resource lock.

 *

 * The arbiter will first look for all VGA cards that might conflict and disable

 * their IOs and/or Memory access, including VGA forwarding on P2P bridges if

	int rc = 0;

	vga_check_first_use();

	/* The one who calls us should check for this, but lets be sure... */

	/* The caller should check for this, but let's be sure */

	if (pdev == NULL)

		pdev = vga_default_device();

	if (pdev == NULL)

		if (conflict == NULL)

			break;

		/* We have a conflict, we wait until somebody kicks the

		/*

		 * We have a conflict; we wait until somebody kicks the

		 * work queue. Currently we have one work queue that we

		 * kick each time some resources are released, but it would

		 * be fairly easy to have a per device one so that we only

		 * need to attach to the conflicting device

		 * be fairly easy to have a per-device one so that we only

		 * need to attach to the conflicting device.

		 */

		init_waitqueue_entry(&wait, current);

		add_wait_queue(&vga_wait_queue, &wait);

/**

 * vga_tryget - try to acquire & lock legacy VGA resources

 * @pdev: pci devivce of VGA card or NULL for system default

 * @pdev: PCI device of VGA card or NULL for system default

 * @rsrc: bit mask of resources to acquire and lock

 *

 * This function performs the same operation as vga_get(), but will return an

 * error (-EBUSY) instead of blocking if the resources are already locked by

 * another card. It can be called in any context

 * Perform the same operation as vga_get(), but return an error (-EBUSY)

 * instead of blocking if the resources are already locked by another card.

 * Can be called in any context.

 *

 * On success, release the VGA resource again with vga_put().

 *

	vga_check_first_use();

	/* The one who calls us should check for this, but lets be sure... */

	/* The caller should check for this, but let's be sure */

	if (pdev == NULL)

		pdev = vga_default_device();

	if (pdev == NULL)

/**

 * vga_put - release lock on legacy VGA resources

 * @pdev: pci device of VGA card or NULL for system default

 * @rsrc: but mask of resource to release

 * @pdev: PCI device of VGA card or NULL for system default

 * @rsrc: bit mask of resource to release

 *

 * This fuction releases resources previously locked by vga_get() or

 * vga_tryget(). The resources aren't disabled right away, so that a subsequence

 * vga_get() on the same card will succeed immediately. Resources have a

 * counter, so locks are only released if the counter reaches 0.

 * Release resources previously locked by vga_get() or vga_tryget().  The

 * resources aren't disabled right away, so that a subsequent vga_get() on

 * the same card will succeed immediately.  Resources have a counter, so

 * locks are only released if the counter reaches 0.

 */

void vga_put(struct pci_dev *pdev, unsigned int rsrc)

{

	struct vga_device *vgadev;

	unsigned long flags;

	/* The one who calls us should check for this, but lets be sure... */

	/* The caller should check for this, but let's be sure */

	if (pdev == NULL)

		pdev = vga_default_device();

	if (pdev == NULL)

	}

	/*

	 * vgadev has neither IO nor MEM enabled.  If we haven't found any

	 * Vgadev has neither IO nor MEM enabled.  If we haven't found any

	 * other VGA devices, it is the best candidate so far.

	 */

	if (!boot_vga)

		return;

	}

	/* okay iterate the new devices bridge hierarachy */

	/* Iterate the new device's bridge hierarchy */

	new_bus = vgadev->pdev->bus;

	while (new_bus) {

		new_bridge = new_bus->self;

		/* go through list of devices already registered */

		/* Go through list of devices already registered */

		list_for_each_entry(same_bridge_vgadev, &vga_list, list) {

			bus = same_bridge_vgadev->pdev->bus;

			bridge = bus->self;

			/* see if the share a bridge with this device */

			/* See if it shares a bridge with this device */

			if (new_bridge == bridge) {

				/*

				 * If their direct parent bridge is the same

				 * If its direct parent bridge is the same

				 * as any bridge of this device then it can't

				 * be used for that device.

				 */

			}

			/*

			 * Now iterate the previous devices bridge hierarchy.

			 * If the new devices parent bridge is in the other

			 * devices hierarchy then we can't use it to control

			 * this device

			 * Now iterate the previous device's bridge hierarchy.

			 * If the new device's parent bridge is in the other

			 * device's hierarchy, we can't use it to control this

			 * device.

			 */

			while (bus) {

				bridge = bus->self;

}

/*

 * Currently, we assume that the "initial" setup of the system is

 * not sane, that is we come up with conflicting devices and let

 * the arbiter's client decides if devices decodes or not legacy

 * things.

 * Currently, we assume that the "initial" setup of the system is not sane,

 * that is, we come up with conflicting devices and let the arbiter's

 * client decide if devices decodes legacy things or not.

 */

static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)

{

	vgadev->decodes = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |

			  VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;

	/* by default mark it as decoding */

	/* By default, mark it as decoding */

	vga_decode_count++;

	/* Mark that we "own" resources based on our enables, we will

	 * clear that below if the bridge isn't forwarding

	/*

	 * Mark that we "own" resources based on our enables, we will

	 * clear that below if the bridge isn't forwarding.

	 */

	pci_read_config_word(pdev, PCI_COMMAND, &cmd);

	if (cmd & PCI_COMMAND_IO)

	return ret;

}

/* This is called with the lock */

/* Called with the lock */

static void vga_update_device_decodes(struct vga_device *vgadev,

				      unsigned int new_decodes)

{

		__vga_put(vgadev, decodes_unlocked);

	}

	/* change decodes counter */

	/* Change decodes counter */

	if (old_decodes & VGA_RSRC_LEGACY_MASK &&

	    !(new_decodes & VGA_RSRC_LEGACY_MASK))

		vga_decode_count--;

	if (vgadev == NULL)

		goto bail;

	/* don't let userspace futz with kernel driver decodes */

	/* Don't let userspace futz with kernel driver decodes */

	if (userspace && vgadev->set_decode)

		goto bail;

	/* update the device decodes + counter */

	/* Update the device decodes + counter */

	vga_update_device_decodes(vgadev, decodes);

	/* XXX if somebody is going from "doesn't decode" to "decodes" state

	 * here, additional care must be taken as we may have pending owner

	 * ship of non-legacy region ...

	/*

	 * XXX If somebody is going from "doesn't decode" to "decodes"

	 * state here, additional care must be taken as we may have pending

	 * ownership of non-legacy region.

	 */

bail:

	spin_unlock_irqrestore(&vga_lock, flags);

/**

 * vga_set_legacy_decoding

 * @pdev: pci device of the VGA card

 * @pdev: PCI device of the VGA card

 * @decodes: bit mask of what legacy regions the card decodes

 *

 * Indicates to the arbiter if the card decodes legacy VGA IOs, legacy VGA

 * Indicate to the arbiter if the card decodes legacy VGA IOs, legacy VGA

 * Memory, both, or none. All cards default to both, the card driver (fbdev for

 * example) should tell the arbiter if it has disabled legacy decoding, so the

 * card can be left out of the arbitration process (and can be safe to take

/**

 * vga_client_register - register or unregister a VGA arbitration client

 * @pdev: pci device of the VGA client

 * @set_decode: vga decode change callback

 * @pdev: PCI device of the VGA client

 * @set_decode: VGA decode change callback

 *

 * Clients have two callback mechanisms they can use.

 *

 * @set_decode callback: If a client can disable its GPU VGA resource, it

 * will get a callback from this to set the encode/decode state.

 *

 * Rationale: we cannot disable VGA decode resources unconditionally some single

 * GPU laptops seem to require ACPI or BIOS access to the VGA registers to

 * control things like backlights etc.  Hopefully newer multi-GPU laptops do

 * something saner, and desktops won't have any special ACPI for this. The

 * driver will get a callback when VGA arbitration is first used by userspace

 * since some older X servers have issues.

 * Rationale: we cannot disable VGA decode resources unconditionally

 * because some single GPU laptops seem to require ACPI or BIOS access to

 * the VGA registers to control things like backlights etc. Hopefully newer

 * multi-GPU laptops do something saner, and desktops won't have any

 * special ACPI for this. The driver will get a callback when VGA

 * arbitration is first used by userspace since some older X servers have

 * issues.

 *

 * This function does not check whether a client for @pdev has been registered

 * already.

 * Does not check whether a client for @pdev has been registered already.

 *

 * To unregister just call vga_client_unregister().

 * To unregister, call vga_client_unregister().

 *

 * Returns: 0 on success, -ENODEV on failure

 */

 *

 * Semantics is:

 *

 *  open       : open user instance of the arbitrer. by default, it's

 *  open       : Open user instance of the arbiter. By default, it's

 *                attached to the default VGA device of the system.

 *

 *  close      : close user instance, release locks

 *  close      : Close user instance, release locks

 *

 *  read       : return a string indicating the status of the target.

 *                an IO state string is of the form {io,mem,io+mem,none},

 *  read       : Return a string indicating the status of the target.

 *                An IO state string is of the form {io,mem,io+mem,none},

 *                mc and ic are respectively mem and io lock counts (for

 *                debugging/diagnostic only). "decodes" indicate what the

 *                card currently decodes, "owns" indicates what is currently

 * write       : write a command to the arbiter. List of commands is:

 *

 *   target <card_ID>   : switch target to card <card_ID> (see below)

 *   lock <io_state>    : acquires locks on target ("none" is invalid io_state)

 *   lock <io_state>    : acquire locks on target ("none" is invalid io_state)

 *   trylock <io_state> : non-blocking acquire locks on target

 *   unlock <io_state>  : release locks on target

 *   unlock all         : release all locks on target held by this user

 * Note about locks:

 *

 * The driver keeps track of which user has what locks on which card. It

 * supports stacking, like the kernel one. This complexifies the implementation

 * supports stacking, like the kernel one. This complicates the implementation

 * a bit, but makes the arbiter more tolerant to userspace problems and able

 * to properly cleanup in all cases when a process dies.

 * Currently, a max of 16 cards simultaneously can have locks issued from

 * userspace for a given user (file descriptor instance) of the arbiter.

 *

 * If the device is hot-unplugged, there is a hook inside the module to notify

 * they being added/removed in the system and automatically added/removed in

 * it being added/removed in the system and automatically added/removed in

 * the arbiter.

 */

#define MAX_USER_CARDS         CONFIG_VGA_ARB_MAX_GPUS

#define PCI_INVALID_CARD       ((struct pci_dev *)-1UL)

/*

 * Each user has an array of these, tracking which cards have locks

 */

/* Each user has an array of these, tracking which cards have locks */

struct vga_arb_user_card {

	struct pci_dev *pdev;

	unsigned int mem_cnt;

/*

 * This function gets a string in the format: "PCI:domain:bus:dev.fn" and

 * returns the respective values. If the string is not in this format,

 * it returns 0.

 * Take a string in the format: "PCI:domain:bus:dev.fn" and return the

 * respective values. If the string is not in this format, return 0.

 */

static int vga_pci_str_to_vars(char *buf, int count, unsigned int *domain,

			       unsigned int *bus, unsigned int *devfn)

	int n;

	unsigned int slot, func;

	n = sscanf(buf, "PCI:%x:%x:%x.%x", domain, bus, &slot, &func);

	if (n != 4)

		return 0;

	if (lbuf == NULL)

		return -ENOMEM;

	/* Protects vga_list */

	/* Protect vga_list */

	spin_lock_irqsave(&vga_lock, flags);

	/* If we are targeting the default, use it */

	/* Find card vgadev structure */

	vgadev = vgadev_find(pdev);

	if (vgadev == NULL) {

		/* Wow, it's not in the list, that shouldn't happen,

		 * let's fix us up and return invalid card

		/*

		 * Wow, it's not in the list, that shouldn't happen, let's

		 * fix us up and return invalid card.

		 */

		spin_unlock_irqrestore(&vga_lock, flags);

		len = sprintf(lbuf, "invalid");

		goto done;

	}

	/* Fill the buffer with infos */

	/* Fill the buffer with info */

	len = snprintf(lbuf, 1024,

		       "count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%u:%u)\n",

		       vga_decode_count, pci_name(pdev),

	if (copy_from_user(kbuf, buf, count))

		return -EFAULT;

	curr_pos = kbuf;

	kbuf[count] = '\0';	/* Just to make sure... */

	kbuf[count] = '\0';

	if (strncmp(curr_pos, "lock ", 5) == 0) {

		curr_pos += 5;

		vga_get_uninterruptible(pdev, io_state);

		/* Update the client's locks lists... */

		/* Update the client's locks lists */

		for (i = 0; i < MAX_USER_CARDS; i++) {

			if (priv->cards[i].pdev == pdev) {

				if (io_state & VGA_RSRC_LEGACY_IO)

		curr_pos += 7;

		remaining -= 7;

		pr_debug("client 0x%p called 'target'\n", priv);

		/* if target is default */

		/* If target is default */

		if (!strncmp(curr_pos, "default", 7))

			pdev = pci_dev_get(vga_default_device());

		else {

			vgaarb_dbg(&pdev->dev, "maximum user cards (%d) number reached, ignoring this one!\n",

				MAX_USER_CARDS);

			pci_dev_put(pdev);

			/* XXX: which value to return? */

			/* XXX: Which value to return? */

			ret_val =  -ENOMEM;

			goto done;

		}

	list_add(&priv->list, &vga_user_list);

	spin_unlock_irqrestore(&vga_user_lock, flags);

	/* Set the client' lists of locks */

	/* Set the client's lists of locks */

	priv->target = vga_default_device(); /* Maybe this is still null! */

	priv->cards[0].pdev = priv->target;

	priv->cards[0].io_cnt = 0;

	priv->cards[0].mem_cnt = 0;

	return 0;

}

}

/*

 * callback any registered clients to let them know we have a

 * change in VGA cards

 * Callback any registered clients to let them know we have a change in VGA

 * cards.

 */

static void vga_arbiter_notify_clients(void)

{

	vgaarb_dbg(dev, "%s\n", __func__);

	/* For now we're only intereted in devices added and removed. I didn't

	 * test this thing here, so someone needs to double check for the

	 * cases of hotplugable vga cards. */

	/*

	 * For now, we're only interested in devices added and removed.

	 * I didn't test this thing here, so someone needs to double check

	 * for the cases of hot-pluggable VGA cards.

	 */

	if (action == BUS_NOTIFY_ADD_DEVICE)

		notify = vga_arbiter_add_pci_device(pdev);

	else if (action == BUS_NOTIFY_DEL_DEVICE)

	bus_register_notifier(&pci_bus_type, &pci_notifier);

	/* We add all PCI devices satisfying VGA class in the arbiter by

	 * default */

	/* Add all VGA class PCI devices by default */

	pdev = NULL;

	while ((pdev =

		pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,