[mirror_ubuntu-zesty-kernel.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/slab.h>

#include "pci.h"

void pci_add_resource_offset(struct list_head *resources, struct resource *res,
			     resource_size_t offset)
{
	struct resource_entry *entry;

	entry = resource_list_create_entry(res, 0);
	if (!entry) {
		printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
		return;
	}

	entry->offset = offset;
	resource_list_add_tail(entry, 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)
{
	resource_list_free(resources);
}
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);
	}
}

int devm_request_pci_bus_resources(struct device *dev,
				   struct list_head *resources)
{
	struct resource_entry *win;
	struct resource *parent, *res;
	int err;

	resource_list_for_each_entry(win, resources) {
		res = win->res;
		switch (resource_type(res)) {
		case IORESOURCE_IO:
			parent = &ioport_resource;
			break;
		case IORESOURCE_MEM:
			parent = &iomem_resource;
			break;
		default:
			continue;
		}

		err = devm_request_resource(dev, parent, res);
		if (err)
			return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);

static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
static struct pci_bus_region pci_64_bit = {0,
				(pci_bus_addr_t) 0xffffffffffffffffULL};
static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
				(pci_bus_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) {
		resource_size_t min_used = min;

		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_used = avail.start;

		max = avail.end;

		/* Ok, try it out.. */
		ret = allocate_resource(r, res, size, min_used, 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_PCI_BUS_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);
}
EXPORT_SYMBOL(pci_bus_alloc_resource);

/*
 * The @idx resource of @dev should be a PCI-PCI bridge window.  If this
 * resource fits inside a window of an upstream bridge, do nothing.  If it
 * overlaps an upstream window but extends outside it, clip the resource so
 * it fits completely inside.
 */
bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
{
	struct pci_bus *bus = dev->bus;
	struct resource *res = &dev->resource[idx];
	struct resource orig_res = *res;
	struct resource *r;
	int i;

	pci_bus_for_each_resource(bus, r, i) {
		resource_size_t start, end;

		if (!r)
			continue;

		if (resource_type(res) != resource_type(r))
			continue;

		start = max(r->start, res->start);
		end = min(r->end, res->end);

		if (start > end)
			continue;	/* no overlap */

		if (res->start == start && res->end == end)
			return false;	/* no change */

		res->start = start;
		res->end = end;
		res->flags &= ~IORESOURCE_UNSET;
		orig_res.flags &= ~IORESOURCE_UNSET;
		dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
				 &orig_res, res);

		return true;
	}

	return false;
}

void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }

void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }

/**
 * pci_bus_add_device - start driver for a single device
 * @dev: device to add
 *
 * This adds add sysfs entries and start device drivers
 */
void 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.
	 */
	pcibios_bus_add_device(dev);
	pci_fixup_device(pci_fixup_final, dev);
	pci_create_sysfs_dev_files(dev);
	pci_proc_attach_device(dev);
	pci_bridge_d3_update(dev);

	dev->match_driver = true;
	retval = device_attach(&dev->dev);
	if (retval < 0 && retval != -EPROBE_DEFER) {
		dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
		pci_proc_detach_device(dev);
		pci_remove_sysfs_dev_files(dev);
		return;
	}

	dev->is_added = 1;
}
EXPORT_SYMBOL_GPL(pci_bus_add_device);

/**
 * 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;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		/* Skip already-added devices */
		if (dev->is_added)
			continue;
		pci_bus_add_device(dev);
	}

	list_for_each_entry(dev, &bus->devices, bus_list) {
		/* Skip if device attach failed */
		if (!dev->is_added)
			continue;
		child = dev->subordinate;
		if (child)
			pci_bus_add_devices(child);
	}
}
EXPORT_SYMBOL(pci_bus_add_devices);

/** 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);
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>
5a0e3ad6	16	#include <linux/slab.h>
1da177e4 LT	17
	18	#include "pci.h"
	19
0efd5aab BH	20	void pci_add_resource_offset(struct list_head resources, struct resource res,
0efd5aab BH	21	resource_size_t offset)
45ca9e97	22	{
14d76b68	23	struct resource_entry *entry;
45ca9e97	24
14d76b68 JL	25	entry = resource_list_create_entry(res, 0);
14d76b68 JL	26	if (!entry) {
0efd5aab	27	printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
45ca9e97 BH	28	return;
	29	}
	30
14d76b68 JL	31	entry->offset = offset;
14d76b68 JL	32	resource_list_add_tail(entry, resources);
0efd5aab BH	33	}
	34	EXPORT_SYMBOL(pci_add_resource_offset);
	35
	36	void pci_add_resource(struct list_head resources, struct resource res)
	37	{
	38	pci_add_resource_offset(resources, res, 0);
45ca9e97 BH	39	}
	40	EXPORT_SYMBOL(pci_add_resource);
	41
	42	void pci_free_resource_list(struct list_head *resources)
	43	{
14d76b68	44	resource_list_free(resources);
45ca9e97 BH	45	}
	46	EXPORT_SYMBOL(pci_free_resource_list);
	47
2fe2abf8 BH	48	void pci_bus_add_resource(struct pci_bus bus, struct resource res,
	49	unsigned int flags)
	50	{
	51	struct pci_bus_resource *bus_res;
	52
	53	bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
	54	if (!bus_res) {
	55	dev_err(&bus->dev, "can't add %pR resource\n", res);
	56	return;
	57	}
	58
	59	bus_res->res = res;
	60	bus_res->flags = flags;
	61	list_add_tail(&bus_res->list, &bus->resources);
	62	}
	63
	64	struct resource pci_bus_resource_n(const struct pci_bus bus, int n)
	65	{
	66	struct pci_bus_resource *bus_res;
	67
	68	if (n < PCI_BRIDGE_RESOURCE_NUM)
	69	return bus->resource[n];
	70
	71	n -= PCI_BRIDGE_RESOURCE_NUM;
	72	list_for_each_entry(bus_res, &bus->resources, list) {
	73	if (n-- == 0)
	74	return bus_res->res;
	75	}
	76	return NULL;
	77	}
	78	EXPORT_SYMBOL_GPL(pci_bus_resource_n);
	79
	80	void pci_bus_remove_resources(struct pci_bus *bus)
	81	{
2fe2abf8	82	int i;
817a2685	83	struct pci_bus_resource bus_res, tmp;
2fe2abf8 BH	84
2fe2abf8 BH	85	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
7736a05a	86	bus->resource[i] = NULL;
2fe2abf8	87
817a2685 YL	88	list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
	89	list_del(&bus_res->list);
	90	kfree(bus_res);
	91	}
2fe2abf8 BH	92	}
2fe2abf8 BH	93
950334bc BH	94	int devm_request_pci_bus_resources(struct device *dev,
	95	struct list_head *resources)
	96	{
	97	struct resource_entry *win;
	98	struct resource parent, res;
	99	int err;
	100
	101	resource_list_for_each_entry(win, resources) {
	102	res = win->res;
	103	switch (resource_type(res)) {
	104	case IORESOURCE_IO:
	105	parent = &ioport_resource;
	106	break;
	107	case IORESOURCE_MEM:
	108	parent = &iomem_resource;
	109	break;
	110	default:
	111	continue;
	112	}
	113
	114	err = devm_request_resource(dev, parent, res);
	115	if (err)
	116	return err;
	117	}
	118
	119	return 0;
	120	}
	121	EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
	122
f75b99d5	123	static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
3a9ad0b4	124	#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
f75b99d5	125	static struct pci_bus_region pci_64_bit = {0,
3a9ad0b4 YL	126	(pci_bus_addr_t) 0xffffffffffffffffULL};
	127	static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
	128	(pci_bus_addr_t) 0xffffffffffffffffULL};
f75b99d5 YL	129	#endif
	130
	131	/*
	132	* @res contains CPU addresses. Clip it so the corresponding bus addresses
	133	* on @bus are entirely within @region. This is used to control the bus
	134	* addresses of resources we allocate, e.g., we may need a resource that
	135	* can be mapped by a 32-bit BAR.
1da177e4	136	*/
f75b99d5 YL	137	static void pci_clip_resource_to_region(struct pci_bus *bus,
	138	struct resource *res,
	139	struct pci_bus_region *region)
	140	{
	141	struct pci_bus_region r;
	142
	143	pcibios_resource_to_bus(bus, &r, res);
	144	if (r.start < region->start)
	145	r.start = region->start;
	146	if (r.end > region->end)
	147	r.end = region->end;
	148
	149	if (r.end < r.start)
	150	res->end = res->start - 1;
	151	else
	152	pcibios_bus_to_resource(bus, res, &r);
	153	}
	154
	155	static int pci_bus_alloc_from_region(struct pci_bus bus, struct resource res,
e31dd6e4	156	resource_size_t size, resource_size_t align,
664c2848	157	resource_size_t min, unsigned long type_mask,
b26b2d49	158	resource_size_t (alignf)(void ,
3b7a17fc	159	const struct resource *,
b26b2d49 DB	160	resource_size_t,
b26b2d49 DB	161	resource_size_t),
f75b99d5 YL	162	void *alignf_data,
f75b99d5 YL	163	struct pci_bus_region *region)
1da177e4	164	{
f75b99d5 YL	165	int i, ret;
	166	struct resource *r, avail;
	167	resource_size_t max;
1da177e4	168
aa11fc58	169	type_mask \|= IORESOURCE_TYPE_BITS;
1da177e4	170
6db45b76	171	pci_bus_for_each_resource(bus, r, i) {
3460baa6 CB	172	resource_size_t min_used = min;
3460baa6 CB	173
6db45b76 BH	174	if (!r)
	175	continue;
	176
1da177e4 LT	177	/* type_mask must match */
	178	if ((res->flags ^ r->flags) & type_mask)
	179	continue;
	180
	181	/* We cannot allocate a non-prefetching resource
	182	from a pre-fetching area */
	183	if ((r->flags & IORESOURCE_PREFETCH) &&
	184	!(res->flags & IORESOURCE_PREFETCH))
	185	continue;
	186
f75b99d5 YL	187	avail = *r;
f75b99d5 YL	188	pci_clip_resource_to_region(bus, &avail, region);
f75b99d5	189
36e097a8 BH	190	/*
	191	* "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
	192	* protect badly documented motherboard resources, but if
	193	* this is an already-configured bridge window, its start
	194	* overrides "min".
	195	*/
f75b99d5	196	if (avail.start)
3460baa6	197	min_used = avail.start;
f75b99d5 YL	198
f75b99d5 YL	199	max = avail.end;
36e097a8	200
1da177e4	201	/* Ok, try it out.. */
3460baa6	202	ret = allocate_resource(r, res, size, min_used, max,
36e097a8	203	align, alignf, alignf_data);
1da177e4	204	if (ret == 0)
f75b99d5	205	return 0;
1da177e4	206	}
f75b99d5 YL	207	return -ENOMEM;
	208	}
	209
	210	/**
	211	* pci_bus_alloc_resource - allocate a resource from a parent bus
	212	* @bus: PCI bus
	213	* @res: resource to allocate
	214	* @size: size of resource to allocate
	215	* @align: alignment of resource to allocate
	216	* @min: minimum /proc/iomem address to allocate
	217	* @type_mask: IORESOURCE_* type flags
	218	* @alignf: resource alignment function
	219	* @alignf_data: data argument for resource alignment function
	220	*
	221	* Given the PCI bus a device resides on, the size, minimum address,
	222	* alignment and type, try to find an acceptable resource allocation
	223	* for a specific device resource.
	224	*/
d56dbf5b	225	int pci_bus_alloc_resource(struct pci_bus bus, struct resource res,
f75b99d5	226	resource_size_t size, resource_size_t align,
664c2848	227	resource_size_t min, unsigned long type_mask,
f75b99d5 YL	228	resource_size_t (alignf)(void ,
	229	const struct resource *,
	230	resource_size_t,
	231	resource_size_t),
	232	void *alignf_data)
	233	{
3a9ad0b4	234	#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
d56dbf5b YL	235	int rc;
	236
	237	if (res->flags & IORESOURCE_MEM_64) {
	238	rc = pci_bus_alloc_from_region(bus, res, size, align, min,
	239	type_mask, alignf, alignf_data,
	240	&pci_high);
	241	if (rc == 0)
	242	return 0;
	243
f75b99d5 YL	244	return pci_bus_alloc_from_region(bus, res, size, align, min,
	245	type_mask, alignf, alignf_data,
	246	&pci_64_bit);
1da177e4	247	}
f75b99d5 YL	248	#endif
	249
	250	return pci_bus_alloc_from_region(bus, res, size, align, min,
	251	type_mask, alignf, alignf_data,
	252	&pci_32_bit);
1da177e4	253	}
b7fe9434	254	EXPORT_SYMBOL(pci_bus_alloc_resource);
1da177e4	255
0f7e7aee YL	256	/*
	257	* The @idx resource of @dev should be a PCI-PCI bridge window. If this
	258	* resource fits inside a window of an upstream bridge, do nothing. If it
	259	* overlaps an upstream window but extends outside it, clip the resource so
	260	* it fits completely inside.
	261	*/
	262	bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
	263	{
	264	struct pci_bus *bus = dev->bus;
	265	struct resource *res = &dev->resource[idx];
	266	struct resource orig_res = *res;
	267	struct resource *r;
	268	int i;
	269
	270	pci_bus_for_each_resource(bus, r, i) {
	271	resource_size_t start, end;
	272
	273	if (!r)
	274	continue;
	275
	276	if (resource_type(res) != resource_type(r))
	277	continue;
	278
	279	start = max(r->start, res->start);
	280	end = min(r->end, res->end);
	281
	282	if (start > end)
	283	continue; /* no overlap */
	284
	285	if (res->start == start && res->end == end)
	286	return false; /* no change */
	287
	288	res->start = start;
	289	res->end = end;
b838b39e BH	290	res->flags &= ~IORESOURCE_UNSET;
b838b39e BH	291	orig_res.flags &= ~IORESOURCE_UNSET;
0f7e7aee YL	292	dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
	293	&orig_res, res);
	294
	295	return true;
	296	}
	297
	298	return false;
	299	}
	300
3c449ed0 YL	301	void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
3c449ed0 YL	302
7b77061f WY	303	void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
7b77061f WY	304
1da177e4	305	/**
4f535093	306	* pci_bus_add_device - start driver for a single device
1da177e4 LT	307	* @dev: device to add
1da177e4 LT	308	*
4f535093	309	* This adds add sysfs entries and start device drivers
1da177e4	310	*/
c893d133	311	void pci_bus_add_device(struct pci_dev *dev)
1da177e4	312	{
b19441af	313	int retval;
735bff10	314
4f535093 YL	315	/*
	316	* Can not put in pci_device_add yet because resources
	317	* are not assigned yet for some devices.
	318	*/
7b77061f	319	pcibios_bus_add_device(dev);
e253aaf0	320	pci_fixup_device(pci_fixup_final, dev);
4f535093	321	pci_create_sysfs_dev_files(dev);
ef37702e	322	pci_proc_attach_device(dev);
1ed276a7	323	pci_bridge_d3_update(dev);
1da177e4	324
58d9a38f YL	325	dev->match_driver = true;
58d9a38f YL	326	retval = device_attach(&dev->dev);
9a2a5a63	327	if (retval < 0 && retval != -EPROBE_DEFER) {
ab1a187b BH	328	dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
	329	pci_proc_detach_device(dev);
	330	pci_remove_sysfs_dev_files(dev);
	331	return;
	332	}
58d9a38f	333
8a1bc901	334	dev->is_added = 1;
876e501a	335	}
b7fe9434	336	EXPORT_SYMBOL_GPL(pci_bus_add_device);
876e501a	337
1da177e4	338	/**
4f535093	339	* pci_bus_add_devices - start driver for PCI devices
1da177e4 LT	340	* @bus: bus to check for new devices
1da177e4 LT	341	*
4f535093	342	* Start driver for PCI devices and add some sysfs entries.
1da177e4	343	*/
c48f1670	344	void pci_bus_add_devices(const struct pci_bus *bus)
1da177e4 LT	345	{
1da177e4 LT	346	struct pci_dev *dev;
3fa16fdb	347	struct pci_bus *child;
1da177e4 LT	348
1da177e4 LT	349	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901 GKH	350	/* Skip already-added devices */
8a1bc901 GKH	351	if (dev->is_added)
1da177e4	352	continue;
c893d133	353	pci_bus_add_device(dev);
1da177e4 LT	354	}
	355
	356	list_for_each_entry(dev, &bus->devices, bus_list) {
1e398eae LW	357	/* Skip if device attach failed */
	358	if (!dev->is_added)
	359	continue;
3fa16fdb	360	child = dev->subordinate;
981cf9ea JL	361	if (child)
981cf9ea JL	362	pci_bus_add_devices(child);
1da177e4 LT	363	}
1da177e4 LT	364	}
b7fe9434	365	EXPORT_SYMBOL(pci_bus_add_devices);
1da177e4	366
cecf4864 PM	367	/** pci_walk_bus - walk devices on/under bus, calling callback.
	368	* @top bus whose devices should be walked
	369	* @cb callback to be called for each device found
	370	* @userdata arbitrary pointer to be passed to callback.
	371	*
	372	* Walk the given bus, including any bridged devices
	373	* on buses under this bus. Call the provided callback
	374	* on each device found.
70298c6e ZY	375	*
	376	* We check the return of @cb each time. If it returns anything
	377	* other than 0, we break out.
	378	*
cecf4864	379	*/
70298c6e	380	void pci_walk_bus(struct pci_bus top, int (cb)(struct pci_dev , void ),
cecf4864 PM	381	void *userdata)
	382	{
	383	struct pci_dev *dev;
	384	struct pci_bus *bus;
	385	struct list_head *next;
70298c6e	386	int retval;
cecf4864 PM	387
cecf4864 PM	388	bus = top;
d71374da	389	down_read(&pci_bus_sem);
cecf4864 PM	390	next = top->devices.next;
	391	for (;;) {
	392	if (next == &bus->devices) {
	393	/* end of this bus, go up or finish */
	394	if (bus == top)
	395	break;
	396	next = bus->self->bus_list.next;
	397	bus = bus->self->bus;
	398	continue;
	399	}
	400	dev = list_entry(next, struct pci_dev, bus_list);
cecf4864 PM	401	if (dev->subordinate) {
	402	/* this is a pci-pci bridge, do its devices next */
	403	next = dev->subordinate->devices.next;
	404	bus = dev->subordinate;
	405	} else
	406	next = dev->bus_list.next;
cecf4864	407
70298c6e	408	retval = cb(dev, userdata);
70298c6e ZY	409	if (retval)
70298c6e ZY	410	break;
cecf4864	411	}
d71374da	412	up_read(&pci_bus_sem);
cecf4864	413	}
7c94def8	414	EXPORT_SYMBOL_GPL(pci_walk_bus);
cecf4864	415
fe830ef6 JL	416	struct pci_bus pci_bus_get(struct pci_bus bus)
	417	{
	418	if (bus)
	419	get_device(&bus->dev);
	420	return bus;
	421	}
	422	EXPORT_SYMBOL(pci_bus_get);
	423
	424	void pci_bus_put(struct pci_bus *bus)
	425	{
	426	if (bus)
	427	put_device(&bus->dev);
	428	}
	429	EXPORT_SYMBOL(pci_bus_put);