[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 long 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_TYPE_BITS;

	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);

		/*
		 * "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 long 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);
	pci_proc_attach_device(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	134	resource_size_t size, resource_size_t align,
664c2848	135	resource_size_t min, unsigned long 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	146
aa11fc58	147	type_mask \|= IORESOURCE_TYPE_BITS;
1da177e4	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;
f75b99d5 YL	164	pci_clip_resource_to_region(bus, &avail, region);
f75b99d5	165
36e097a8 BH	166	/*
	167	* "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
	168	* protect badly documented motherboard resources, but if
	169	* this is an already-configured bridge window, its start
	170	* overrides "min".
	171	*/
f75b99d5 YL	172	if (avail.start)
	173	min = avail.start;
	174
	175	max = avail.end;
36e097a8	176
1da177e4	177	/* Ok, try it out.. */
36e097a8 BH	178	ret = allocate_resource(r, res, size, min, max,
36e097a8 BH	179	align, alignf, alignf_data);
1da177e4	180	if (ret == 0)
f75b99d5	181	return 0;
1da177e4	182	}
f75b99d5 YL	183	return -ENOMEM;
	184	}
	185
	186	/**
	187	* pci_bus_alloc_resource - allocate a resource from a parent bus
	188	* @bus: PCI bus
	189	* @res: resource to allocate
	190	* @size: size of resource to allocate
	191	* @align: alignment of resource to allocate
	192	* @min: minimum /proc/iomem address to allocate
	193	* @type_mask: IORESOURCE_* type flags
	194	* @alignf: resource alignment function
	195	* @alignf_data: data argument for resource alignment function
	196	*
	197	* Given the PCI bus a device resides on, the size, minimum address,
	198	* alignment and type, try to find an acceptable resource allocation
	199	* for a specific device resource.
	200	*/
d56dbf5b	201	int pci_bus_alloc_resource(struct pci_bus bus, struct resource res,
f75b99d5	202	resource_size_t size, resource_size_t align,
664c2848	203	resource_size_t min, unsigned long type_mask,
f75b99d5 YL	204	resource_size_t (alignf)(void ,
	205	const struct resource *,
	206	resource_size_t,
	207	resource_size_t),
	208	void *alignf_data)
	209	{
	210	#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
d56dbf5b YL	211	int rc;
	212
	213	if (res->flags & IORESOURCE_MEM_64) {
	214	rc = pci_bus_alloc_from_region(bus, res, size, align, min,
	215	type_mask, alignf, alignf_data,
	216	&pci_high);
	217	if (rc == 0)
	218	return 0;
	219
f75b99d5 YL	220	return pci_bus_alloc_from_region(bus, res, size, align, min,
	221	type_mask, alignf, alignf_data,
	222	&pci_64_bit);
1da177e4	223	}
f75b99d5 YL	224	#endif
	225
	226	return pci_bus_alloc_from_region(bus, res, size, align, min,
	227	type_mask, alignf, alignf_data,
	228	&pci_32_bit);
1da177e4 LT	229	}
1da177e4 LT	230
3c449ed0 YL	231	void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
3c449ed0 YL	232
1da177e4	233	/**
4f535093	234	* pci_bus_add_device - start driver for a single device
1da177e4 LT	235	* @dev: device to add
1da177e4 LT	236	*
4f535093	237	* This adds add sysfs entries and start device drivers
1da177e4	238	*/
96bde06a	239	int pci_bus_add_device(struct pci_dev *dev)
1da177e4	240	{
b19441af	241	int retval;
735bff10	242
4f535093 YL	243	/*
	244	* Can not put in pci_device_add yet because resources
	245	* are not assigned yet for some devices.
	246	*/
e253aaf0	247	pci_fixup_device(pci_fixup_final, dev);
4f535093	248	pci_create_sysfs_dev_files(dev);
ef37702e	249	pci_proc_attach_device(dev);
1da177e4	250
58d9a38f YL	251	dev->match_driver = true;
	252	retval = device_attach(&dev->dev);
	253	WARN_ON(retval < 0);
	254
8a1bc901	255	dev->is_added = 1;
876e501a	256
4f535093	257	return 0;
876e501a YZ	258	}
876e501a YZ	259
1da177e4	260	/**
4f535093	261	* pci_bus_add_devices - start driver for PCI devices
1da177e4 LT	262	* @bus: bus to check for new devices
1da177e4 LT	263	*
4f535093	264	* Start driver for PCI devices and add some sysfs entries.
1da177e4	265	*/
c48f1670	266	void pci_bus_add_devices(const struct pci_bus *bus)
1da177e4 LT	267	{
1da177e4 LT	268	struct pci_dev *dev;
3fa16fdb	269	struct pci_bus *child;
b19441af	270	int retval;
1da177e4 LT	271
1da177e4 LT	272	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901 GKH	273	/* Skip already-added devices */
8a1bc901 GKH	274	if (dev->is_added)
1da177e4	275	continue;
b19441af	276	retval = pci_bus_add_device(dev);
9fc9eea0 BH	277	if (retval)
	278	dev_err(&dev->dev, "Error adding device (%d)\n",
	279	retval);
1da177e4 LT	280	}
	281
	282	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901	283	BUG_ON(!dev->is_added);
3fa16fdb	284	child = dev->subordinate;
981cf9ea JL	285	if (child)
981cf9ea JL	286	pci_bus_add_devices(child);
1da177e4 LT	287	}
	288	}
	289
cecf4864 PM	290	/** pci_walk_bus - walk devices on/under bus, calling callback.
	291	* @top bus whose devices should be walked
	292	* @cb callback to be called for each device found
	293	* @userdata arbitrary pointer to be passed to callback.
	294	*
	295	* Walk the given bus, including any bridged devices
	296	* on buses under this bus. Call the provided callback
	297	* on each device found.
70298c6e ZY	298	*
	299	* We check the return of @cb each time. If it returns anything
	300	* other than 0, we break out.
	301	*
cecf4864	302	*/
70298c6e	303	void pci_walk_bus(struct pci_bus top, int (cb)(struct pci_dev , void ),
cecf4864 PM	304	void *userdata)
	305	{
	306	struct pci_dev *dev;
	307	struct pci_bus *bus;
	308	struct list_head *next;
70298c6e	309	int retval;
cecf4864 PM	310
cecf4864 PM	311	bus = top;
d71374da	312	down_read(&pci_bus_sem);
cecf4864 PM	313	next = top->devices.next;
	314	for (;;) {
	315	if (next == &bus->devices) {
	316	/* end of this bus, go up or finish */
	317	if (bus == top)
	318	break;
	319	next = bus->self->bus_list.next;
	320	bus = bus->self->bus;
	321	continue;
	322	}
	323	dev = list_entry(next, struct pci_dev, bus_list);
cecf4864 PM	324	if (dev->subordinate) {
	325	/* this is a pci-pci bridge, do its devices next */
	326	next = dev->subordinate->devices.next;
	327	bus = dev->subordinate;
	328	} else
	329	next = dev->bus_list.next;
cecf4864	330
70298c6e	331	retval = cb(dev, userdata);
70298c6e ZY	332	if (retval)
70298c6e ZY	333	break;
cecf4864	334	}
d71374da	335	up_read(&pci_bus_sem);
cecf4864	336	}
7c94def8	337	EXPORT_SYMBOL_GPL(pci_walk_bus);
cecf4864	338
fe830ef6 JL	339	struct pci_bus pci_bus_get(struct pci_bus bus)
	340	{
	341	if (bus)
	342	get_device(&bus->dev);
	343	return bus;
	344	}
	345	EXPORT_SYMBOL(pci_bus_get);
	346
	347	void pci_bus_put(struct pci_bus *bus)
	348	{
	349	if (bus)
	350	put_device(&bus->dev);
	351	}
	352	EXPORT_SYMBOL(pci_bus_put);
	353
1da177e4 LT	354	EXPORT_SYMBOL(pci_bus_alloc_resource);
	355	EXPORT_SYMBOL_GPL(pci_bus_add_device);
	356	EXPORT_SYMBOL(pci_bus_add_devices);