[deliverable/linux.git] / drivers / pci / bus.c

/*
 *	drivers/pci/bus.c
 *
 * From setup-res.c, by:
 *	Dave Rusling (david.rusling@reo.mts.dec.com)
 *	David Mosberger (davidm@cs.arizona.edu)
 *	David Miller (davem@redhat.com)
 *	Ivan Kokshaysky (ink@jurassic.park.msu.ru)
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/slab.h>

#include "pci.h"

void pci_add_resource_offset(struct list_head *resources, struct resource *res,
			     resource_size_t offset)
{
	struct pci_host_bridge_window *window;

	window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
	if (!window) {
		printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
		return;
	}

	window->res = res;
	window->offset = offset;
	list_add_tail(&window->list, resources);
}
EXPORT_SYMBOL(pci_add_resource_offset);

void pci_add_resource(struct list_head *resources, struct resource *res)
{
	pci_add_resource_offset(resources, res, 0);
}
EXPORT_SYMBOL(pci_add_resource);

void pci_free_resource_list(struct list_head *resources)
{
	struct pci_host_bridge_window *window, *tmp;

	list_for_each_entry_safe(window, tmp, resources, list) {
		list_del(&window->list);
		kfree(window);
	}
}
EXPORT_SYMBOL(pci_free_resource_list);

void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
			  unsigned int flags)
{
	struct pci_bus_resource *bus_res;

	bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
	if (!bus_res) {
		dev_err(&bus->dev, "can't add %pR resource\n", res);
		return;
	}

	bus_res->res = res;
	bus_res->flags = flags;
	list_add_tail(&bus_res->list, &bus->resources);
}

struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
{
	struct pci_bus_resource *bus_res;

	if (n < PCI_BRIDGE_RESOURCE_NUM)
		return bus->resource[n];

	n -= PCI_BRIDGE_RESOURCE_NUM;
	list_for_each_entry(bus_res, &bus->resources, list) {
		if (n-- == 0)
			return bus_res->res;
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(pci_bus_resource_n);

void pci_bus_remove_resources(struct pci_bus *bus)
{
	int i;
	struct pci_bus_resource *bus_res, *tmp;

	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
		bus->resource[i] = NULL;

	list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
		list_del(&bus_res->list);
		kfree(bus_res);
	}
}

static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
static struct pci_bus_region pci_64_bit = {0,
				(dma_addr_t) 0xffffffffffffffffULL};
static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL,
				(dma_addr_t) 0xffffffffffffffffULL};
#endif

/*
 * @res contains CPU addresses.  Clip it so the corresponding bus addresses
 * on @bus are entirely within @region.  This is used to control the bus
 * addresses of resources we allocate, e.g., we may need a resource that
 * can be mapped by a 32-bit BAR.
 */
static void pci_clip_resource_to_region(struct pci_bus *bus,
					struct resource *res,
					struct pci_bus_region *region)
{
	struct pci_bus_region r;

	pcibios_resource_to_bus(bus, &r, res);
	if (r.start < region->start)
		r.start = region->start;
	if (r.end > region->end)
		r.end = region->end;

	if (r.end < r.start)
		res->end = res->start - 1;
	else
		pcibios_bus_to_resource(bus, res, &r);
}

static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
		resource_size_t size, resource_size_t align,
		resource_size_t min, unsigned int type_mask,
		resource_size_t (*alignf)(void *,
					  const struct resource *,
					  resource_size_t,
					  resource_size_t),
		void *alignf_data,
		struct pci_bus_region *region)
{
	int i, ret;
	struct resource *r, avail;
	resource_size_t max;

	type_mask |= IORESOURCE_IO | IORESOURCE_MEM;

	pci_bus_for_each_resource(bus, r, i) {
		if (!r)
			continue;

		/* type_mask must match */
		if ((res->flags ^ r->flags) & type_mask)
			continue;

		/* We cannot allocate a non-prefetching resource
		   from a pre-fetching area */
		if ((r->flags & IORESOURCE_PREFETCH) &&
		    !(res->flags & IORESOURCE_PREFETCH))
			continue;

		avail = *r;
		pci_clip_resource_to_region(bus, &avail, region);
		if (!resource_size(&avail))
			continue;

		/*
		 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
		 * protect badly documented motherboard resources, but if
		 * this is an already-configured bridge window, its start
		 * overrides "min".
		 */
		if (avail.start)
			min = avail.start;

		max = avail.end;

		/* Ok, try it out.. */
		ret = allocate_resource(r, res, size, min, max,
					align, alignf, alignf_data);
		if (ret == 0)
			return 0;
	}
	return -ENOMEM;
}

/**
 * pci_bus_alloc_resource - allocate a resource from a parent bus
 * @bus: PCI bus
 * @res: resource to allocate
 * @size: size of resource to allocate
 * @align: alignment of resource to allocate
 * @min: minimum /proc/iomem address to allocate
 * @type_mask: IORESOURCE_* type flags
 * @alignf: resource alignment function
 * @alignf_data: data argument for resource alignment function
 *
 * Given the PCI bus a device resides on, the size, minimum address,
 * alignment and type, try to find an acceptable resource allocation
 * for a specific device resource.
 */
int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
		resource_size_t size, resource_size_t align,
		resource_size_t min, unsigned int type_mask,
		resource_size_t (*alignf)(void *,
					  const struct resource *,
					  resource_size_t,
					  resource_size_t),
		void *alignf_data)
{
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
	int rc;

	if (res->flags & IORESOURCE_MEM_64) {
		rc = pci_bus_alloc_from_region(bus, res, size, align, min,
					       type_mask, alignf, alignf_data,
					       &pci_high);
		if (rc == 0)
			return 0;

		return pci_bus_alloc_from_region(bus, res, size, align, min,
						 type_mask, alignf, alignf_data,
						 &pci_64_bit);
	}
#endif

	return pci_bus_alloc_from_region(bus, res, size, align, min,
					 type_mask, alignf, alignf_data,
					 &pci_32_bit);
}

void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }

/**
 * pci_bus_add_device - start driver for a single device
 * @dev: device to add
 *
 * This adds add sysfs entries and start device drivers
 */
int pci_bus_add_device(struct pci_dev *dev)
{
	int retval;

	/*
	 * Can not put in pci_device_add yet because resources
	 * are not assigned yet for some devices.
	 */
	pci_fixup_device(pci_fixup_final, dev);
	pci_create_sysfs_dev_files(dev);

	dev->match_driver = true;
	retval = device_attach(&dev->dev);
	WARN_ON(retval < 0);

	dev->is_added = 1;

	return 0;
}

/**
 * pci_bus_add_devices - start driver for PCI devices
 * @bus: bus to check for new devices
 *
 * Start driver for PCI devices and add some sysfs entries.
 */
void pci_bus_add_devices(const struct pci_bus *bus)
{
	struct pci_dev *dev;
	struct pci_bus *child;
	int retval;

	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 (%d)\n",
				retval);
	}

	list_for_each_entry(dev, &bus->devices, bus_list) {
		BUG_ON(!dev->is_added);
		child = dev->subordinate;
		if (child)
			pci_bus_add_devices(child);
	}
}

/** pci_walk_bus - walk devices on/under bus, calling callback.
 *  @top      bus whose devices should be walked
 *  @cb       callback to be called for each device found
 *  @userdata arbitrary pointer to be passed to callback.
 *
 *  Walk the given bus, including any bridged devices
 *  on buses under this bus.  Call the provided callback
 *  on each device found.
 *
 *  We check the return of @cb each time. If it returns anything
 *  other than 0, we break out.
 *
 */
void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
		  void *userdata)
{
	struct pci_dev *dev;
	struct pci_bus *bus;
	struct list_head *next;
	int retval;

	bus = top;
	down_read(&pci_bus_sem);
	next = top->devices.next;
	for (;;) {
		if (next == &bus->devices) {
			/* end of this bus, go up or finish */
			if (bus == top)
				break;
			next = bus->self->bus_list.next;
			bus = bus->self->bus;
			continue;
		}
		dev = list_entry(next, struct pci_dev, bus_list);
		if (dev->subordinate) {
			/* this is a pci-pci bridge, do its devices next */
			next = dev->subordinate->devices.next;
			bus = dev->subordinate;
		} else
			next = dev->bus_list.next;

		retval = cb(dev, userdata);
		if (retval)
			break;
	}
	up_read(&pci_bus_sem);
}
EXPORT_SYMBOL_GPL(pci_walk_bus);

struct pci_bus *pci_bus_get(struct pci_bus *bus)
{
	if (bus)
		get_device(&bus->dev);
	return bus;
}
EXPORT_SYMBOL(pci_bus_get);

void pci_bus_put(struct pci_bus *bus)
{
	if (bus)
		put_device(&bus->dev);
}
EXPORT_SYMBOL(pci_bus_put);

EXPORT_SYMBOL(pci_bus_alloc_resource);
EXPORT_SYMBOL_GPL(pci_bus_add_device);
EXPORT_SYMBOL(pci_bus_add_devices);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/pci/bus.c
	3	*
	4	* From setup-res.c, by:
	5	* Dave Rusling (david.rusling@reo.mts.dec.com)
	6	* David Mosberger (davidm@cs.arizona.edu)
	7	* David Miller (davem@redhat.com)
	8	* Ivan Kokshaysky (ink@jurassic.park.msu.ru)
	9	*/
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/pci.h>
	13	#include <linux/errno.h>
	14	#include <linux/ioport.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/init.h>
5a0e3ad6	17	#include <linux/slab.h>
1da177e4 LT	18
	19	#include "pci.h"
	20
0efd5aab BH	21	void pci_add_resource_offset(struct list_head resources, struct resource res,
0efd5aab BH	22	resource_size_t offset)
45ca9e97	23	{
0efd5aab	24	struct pci_host_bridge_window *window;
45ca9e97	25
0efd5aab BH	26	window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
	27	if (!window) {
	28	printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
45ca9e97 BH	29	return;
	30	}
	31
0efd5aab BH	32	window->res = res;
	33	window->offset = offset;
	34	list_add_tail(&window->list, resources);
	35	}
	36	EXPORT_SYMBOL(pci_add_resource_offset);
	37
	38	void pci_add_resource(struct list_head resources, struct resource res)
	39	{
	40	pci_add_resource_offset(resources, res, 0);
45ca9e97 BH	41	}
	42	EXPORT_SYMBOL(pci_add_resource);
	43
	44	void pci_free_resource_list(struct list_head *resources)
	45	{
0efd5aab	46	struct pci_host_bridge_window window, tmp;
45ca9e97	47
0efd5aab BH	48	list_for_each_entry_safe(window, tmp, resources, list) {
	49	list_del(&window->list);
	50	kfree(window);
45ca9e97 BH	51	}
	52	}
	53	EXPORT_SYMBOL(pci_free_resource_list);
	54
2fe2abf8 BH	55	void pci_bus_add_resource(struct pci_bus bus, struct resource res,
	56	unsigned int flags)
	57	{
	58	struct pci_bus_resource *bus_res;
	59
	60	bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
	61	if (!bus_res) {
	62	dev_err(&bus->dev, "can't add %pR resource\n", res);
	63	return;
	64	}
	65
	66	bus_res->res = res;
	67	bus_res->flags = flags;
	68	list_add_tail(&bus_res->list, &bus->resources);
	69	}
	70
	71	struct resource pci_bus_resource_n(const struct pci_bus bus, int n)
	72	{
	73	struct pci_bus_resource *bus_res;
	74
	75	if (n < PCI_BRIDGE_RESOURCE_NUM)
	76	return bus->resource[n];
	77
	78	n -= PCI_BRIDGE_RESOURCE_NUM;
	79	list_for_each_entry(bus_res, &bus->resources, list) {
	80	if (n-- == 0)
	81	return bus_res->res;
	82	}
	83	return NULL;
	84	}
	85	EXPORT_SYMBOL_GPL(pci_bus_resource_n);
	86
	87	void pci_bus_remove_resources(struct pci_bus *bus)
	88	{
2fe2abf8	89	int i;
817a2685	90	struct pci_bus_resource bus_res, tmp;
2fe2abf8 BH	91
2fe2abf8 BH	92	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
7736a05a	93	bus->resource[i] = NULL;
2fe2abf8	94
817a2685 YL	95	list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
	96	list_del(&bus_res->list);
	97	kfree(bus_res);
	98	}
2fe2abf8 BH	99	}
2fe2abf8 BH	100
f75b99d5 YL	101	static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
	102	#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
	103	static struct pci_bus_region pci_64_bit = {0,
	104	(dma_addr_t) 0xffffffffffffffffULL};
d56dbf5b YL	105	static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL,
d56dbf5b YL	106	(dma_addr_t) 0xffffffffffffffffULL};
f75b99d5 YL	107	#endif
	108
	109	/*
	110	* @res contains CPU addresses. Clip it so the corresponding bus addresses
	111	* on @bus are entirely within @region. This is used to control the bus
	112	* addresses of resources we allocate, e.g., we may need a resource that
	113	* can be mapped by a 32-bit BAR.
1da177e4	114	*/
f75b99d5 YL	115	static void pci_clip_resource_to_region(struct pci_bus *bus,
	116	struct resource *res,
	117	struct pci_bus_region *region)
	118	{
	119	struct pci_bus_region r;
	120
	121	pcibios_resource_to_bus(bus, &r, res);
	122	if (r.start < region->start)
	123	r.start = region->start;
	124	if (r.end > region->end)
	125	r.end = region->end;
	126
	127	if (r.end < r.start)
	128	res->end = res->start - 1;
	129	else
	130	pcibios_bus_to_resource(bus, res, &r);
	131	}
	132
	133	static int pci_bus_alloc_from_region(struct pci_bus bus, struct resource res,
e31dd6e4 GKH	134	resource_size_t size, resource_size_t align,
e31dd6e4 GKH	135	resource_size_t min, unsigned int type_mask,
b26b2d49	136	resource_size_t (alignf)(void ,
3b7a17fc	137	const struct resource *,
b26b2d49 DB	138	resource_size_t,
b26b2d49 DB	139	resource_size_t),
f75b99d5 YL	140	void *alignf_data,
f75b99d5 YL	141	struct pci_bus_region *region)
1da177e4	142	{
f75b99d5 YL	143	int i, ret;
	144	struct resource *r, avail;
	145	resource_size_t max;
1da177e4 LT	146
	147	type_mask \|= IORESOURCE_IO \| IORESOURCE_MEM;
	148
6db45b76 BH	149	pci_bus_for_each_resource(bus, r, i) {
	150	if (!r)
	151	continue;
	152
1da177e4 LT	153	/* type_mask must match */
	154	if ((res->flags ^ r->flags) & type_mask)
	155	continue;
	156
	157	/* We cannot allocate a non-prefetching resource
	158	from a pre-fetching area */
	159	if ((r->flags & IORESOURCE_PREFETCH) &&
	160	!(res->flags & IORESOURCE_PREFETCH))
	161	continue;
	162
f75b99d5 YL	163	avail = *r;
	164	pci_clip_resource_to_region(bus, &avail, region);
	165	if (!resource_size(&avail))
	166	continue;
	167
36e097a8 BH	168	/*
	169	* "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
	170	* protect badly documented motherboard resources, but if
	171	* this is an already-configured bridge window, its start
	172	* overrides "min".
	173	*/
f75b99d5 YL	174	if (avail.start)
	175	min = avail.start;
	176
	177	max = avail.end;
36e097a8	178
1da177e4	179	/* Ok, try it out.. */
36e097a8 BH	180	ret = allocate_resource(r, res, size, min, max,
36e097a8 BH	181	align, alignf, alignf_data);
1da177e4	182	if (ret == 0)
f75b99d5	183	return 0;
1da177e4	184	}
f75b99d5 YL	185	return -ENOMEM;
	186	}
	187
	188	/**
	189	* pci_bus_alloc_resource - allocate a resource from a parent bus
	190	* @bus: PCI bus
	191	* @res: resource to allocate
	192	* @size: size of resource to allocate
	193	* @align: alignment of resource to allocate
	194	* @min: minimum /proc/iomem address to allocate
	195	* @type_mask: IORESOURCE_* type flags
	196	* @alignf: resource alignment function
	197	* @alignf_data: data argument for resource alignment function
	198	*
	199	* Given the PCI bus a device resides on, the size, minimum address,
	200	* alignment and type, try to find an acceptable resource allocation
	201	* for a specific device resource.
	202	*/
d56dbf5b	203	int pci_bus_alloc_resource(struct pci_bus bus, struct resource res,
f75b99d5 YL	204	resource_size_t size, resource_size_t align,
	205	resource_size_t min, unsigned int type_mask,
	206	resource_size_t (alignf)(void ,
	207	const struct resource *,
	208	resource_size_t,
	209	resource_size_t),
	210	void *alignf_data)
	211	{
	212	#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
d56dbf5b YL	213	int rc;
	214
	215	if (res->flags & IORESOURCE_MEM_64) {
	216	rc = pci_bus_alloc_from_region(bus, res, size, align, min,
	217	type_mask, alignf, alignf_data,
	218	&pci_high);
	219	if (rc == 0)
	220	return 0;
	221
f75b99d5 YL	222	return pci_bus_alloc_from_region(bus, res, size, align, min,
	223	type_mask, alignf, alignf_data,
	224	&pci_64_bit);
d56dbf5b	225	}
f75b99d5 YL	226	#endif
	227
	228	return pci_bus_alloc_from_region(bus, res, size, align, min,
	229	type_mask, alignf, alignf_data,
	230	&pci_32_bit);
1da177e4 LT	231	}
1da177e4 LT	232
3c449ed0 YL	233	void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
3c449ed0 YL	234
1da177e4	235	/**
4f535093	236	* pci_bus_add_device - start driver for a single device
1da177e4 LT	237	* @dev: device to add
1da177e4 LT	238	*
4f535093	239	* This adds add sysfs entries and start device drivers
1da177e4	240	*/
96bde06a	241	int pci_bus_add_device(struct pci_dev *dev)
1da177e4	242	{
b19441af	243	int retval;
735bff10	244
4f535093 YL	245	/*
	246	* Can not put in pci_device_add yet because resources
	247	* are not assigned yet for some devices.
	248	*/
e253aaf0	249	pci_fixup_device(pci_fixup_final, dev);
4f535093	250	pci_create_sysfs_dev_files(dev);
1da177e4	251
58d9a38f YL	252	dev->match_driver = true;
	253	retval = device_attach(&dev->dev);
	254	WARN_ON(retval < 0);
	255
8a1bc901	256	dev->is_added = 1;
876e501a	257
4f535093	258	return 0;
876e501a YZ	259	}
876e501a YZ	260
1da177e4	261	/**
4f535093	262	* pci_bus_add_devices - start driver for PCI devices
1da177e4 LT	263	* @bus: bus to check for new devices
1da177e4 LT	264	*
4f535093	265	* Start driver for PCI devices and add some sysfs entries.
1da177e4	266	*/
c48f1670	267	void pci_bus_add_devices(const struct pci_bus *bus)
1da177e4 LT	268	{
1da177e4 LT	269	struct pci_dev *dev;
3fa16fdb	270	struct pci_bus *child;
b19441af	271	int retval;
1da177e4 LT	272
1da177e4 LT	273	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901 GKH	274	/* Skip already-added devices */
8a1bc901 GKH	275	if (dev->is_added)
1da177e4	276	continue;
b19441af	277	retval = pci_bus_add_device(dev);
9fc9eea0 BH	278	if (retval)
	279	dev_err(&dev->dev, "Error adding device (%d)\n",
	280	retval);
1da177e4 LT	281	}
	282
	283	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901	284	BUG_ON(!dev->is_added);
3fa16fdb	285	child = dev->subordinate;
981cf9ea JL	286	if (child)
981cf9ea JL	287	pci_bus_add_devices(child);
1da177e4 LT	288	}
	289	}
	290
cecf4864 PM	291	/** pci_walk_bus - walk devices on/under bus, calling callback.
	292	* @top bus whose devices should be walked
	293	* @cb callback to be called for each device found
	294	* @userdata arbitrary pointer to be passed to callback.
	295	*
	296	* Walk the given bus, including any bridged devices
	297	* on buses under this bus. Call the provided callback
	298	* on each device found.
70298c6e ZY	299	*
	300	* We check the return of @cb each time. If it returns anything
	301	* other than 0, we break out.
	302	*
cecf4864	303	*/
70298c6e	304	void pci_walk_bus(struct pci_bus top, int (cb)(struct pci_dev , void ),
cecf4864 PM	305	void *userdata)
	306	{
	307	struct pci_dev *dev;
	308	struct pci_bus *bus;
	309	struct list_head *next;
70298c6e	310	int retval;
cecf4864 PM	311
cecf4864 PM	312	bus = top;
d71374da	313	down_read(&pci_bus_sem);
cecf4864 PM	314	next = top->devices.next;
	315	for (;;) {
	316	if (next == &bus->devices) {
	317	/* end of this bus, go up or finish */
	318	if (bus == top)
	319	break;
	320	next = bus->self->bus_list.next;
	321	bus = bus->self->bus;
	322	continue;
	323	}
	324	dev = list_entry(next, struct pci_dev, bus_list);
cecf4864 PM	325	if (dev->subordinate) {
	326	/* this is a pci-pci bridge, do its devices next */
	327	next = dev->subordinate->devices.next;
	328	bus = dev->subordinate;
	329	} else
	330	next = dev->bus_list.next;
cecf4864	331
70298c6e	332	retval = cb(dev, userdata);
70298c6e ZY	333	if (retval)
70298c6e ZY	334	break;
cecf4864	335	}
d71374da	336	up_read(&pci_bus_sem);
cecf4864	337	}
7c94def8	338	EXPORT_SYMBOL_GPL(pci_walk_bus);
cecf4864	339
fe830ef6 JL	340	struct pci_bus pci_bus_get(struct pci_bus bus)
	341	{
	342	if (bus)
	343	get_device(&bus->dev);
	344	return bus;
	345	}
	346	EXPORT_SYMBOL(pci_bus_get);
	347
	348	void pci_bus_put(struct pci_bus *bus)
	349	{
	350	if (bus)
	351	put_device(&bus->dev);
	352	}
	353	EXPORT_SYMBOL(pci_bus_put);
	354
1da177e4 LT	355	EXPORT_SYMBOL(pci_bus_alloc_resource);
	356	EXPORT_SYMBOL_GPL(pci_bus_add_device);
	357	EXPORT_SYMBOL(pci_bus_add_devices);