[net-next-2.6.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_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)
{
	struct pci_bus_resource *bus_res, *tmp;
	int i;

	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);
	}
}

/*
 * Find the highest-address bus resource below the cursor "res".  If the
 * cursor is NULL, return the highest resource.
 */
static struct resource *pci_bus_find_resource_prev(struct pci_bus *bus,
						   unsigned int type,
						   struct resource *res)
{
	struct resource *r, *prev = NULL;
	int i;

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

		if ((r->flags & IORESOURCE_TYPE_BITS) != type)
			continue;

		/* If this resource is at or past the cursor, skip it */
		if (res) {
			if (r == res)
				continue;
			if (r->end > res->end)
				continue;
			if (r->end == res->end && r->start > res->start)
				continue;
		}

		if (!prev)
			prev = r;

		/*
		 * A small resource is higher than a large one that ends at
		 * the same address.
		 */
		if (r->end > prev->end ||
		    (r->end == prev->end && r->start > prev->start))
			prev = r;
	}

	return prev;
}

/**
 * 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)
{
	int ret = -ENOMEM;
	struct resource *r;
	resource_size_t max = -1;
	unsigned int type = res->flags & IORESOURCE_TYPE_BITS;

	type_mask |= IORESOURCE_IO | IORESOURCE_MEM;

	/* don't allocate too high if the pref mem doesn't support 64bit*/
	if (!(res->flags & IORESOURCE_MEM_64))
		max = PCIBIOS_MAX_MEM_32;

	/* Look for space at highest addresses first */
	r = pci_bus_find_resource_prev(bus, type, NULL);
	for ( ; r; r = pci_bus_find_resource_prev(bus, type, r)) {
		/* 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;

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

/**
 * pci_bus_add_device - add a single device
 * @dev: device to add
 *
 * This adds a single pci device to the global
 * device list and adds sysfs and procfs entries
 */
int pci_bus_add_device(struct pci_dev *dev)
{
	int retval;
	retval = device_add(&dev->dev);
	if (retval)
		return retval;

	dev->is_added = 1;
	pci_proc_attach_device(dev);
	pci_create_sysfs_dev_files(dev);
	return 0;
}

/**
 * pci_bus_add_child - add a child bus
 * @bus: bus to add
 *
 * This adds sysfs entries for a single bus
 */
int pci_bus_add_child(struct pci_bus *bus)
{
	int retval;

	if (bus->bridge)
		bus->dev.parent = bus->bridge;

	retval = device_register(&bus->dev);
	if (retval)
		return retval;

	bus->is_added = 1;

	retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
	if (retval)
		return retval;

	retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);

	/* Create legacy_io and legacy_mem files for this bus */
	pci_create_legacy_files(bus);

	return retval;
}

/**
 * pci_bus_add_devices - insert newly discovered PCI devices
 * @bus: bus to check for new devices
 *
 * Add newly discovered PCI devices (which are on the bus->devices
 * list) to the global PCI device list, add the sysfs and procfs
 * entries.  Where a bridge is found, add the discovered bus to
 * the parents list of child buses, and recurse (breadth-first
 * to be compatible with 2.4)
 *
 * Call hotplug for each new devices.
 */
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, continuing\n");
	}

	list_for_each_entry(dev, &bus->devices, bus_list) {
		BUG_ON(!dev->is_added);

		child = dev->subordinate;
		/*
		 * If there is an unattached subordinate bus, attach
		 * it and then scan for unattached PCI devices.
		 */
		if (!child)
			continue;
		if (list_empty(&child->node)) {
			down_write(&pci_bus_sem);
			list_add_tail(&child->node, &dev->bus->children);
			up_write(&pci_bus_sem);
		}
		pci_bus_add_devices(child);

		/*
		 * register the bus with sysfs as the parent is now
		 * properly registered.
		 */
		if (child->is_added)
			continue;
		retval = pci_bus_add_child(child);
		if (retval)
			dev_err(&dev->dev, "Error adding bus, continuing\n");
	}
}

void pci_enable_bridges(struct pci_bus *bus)
{
	struct pci_dev *dev;
	int retval;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (dev->subordinate) {
			if (!pci_is_enabled(dev)) {
				retval = pci_enable_device(dev);
				if (retval)
					dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
				pci_set_master(dev);
			}
			pci_enable_bridges(dev->subordinate);
		}
	}
}

/** 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;

		/* Run device routines with the device locked */
		device_lock(&dev->dev);
		retval = cb(dev, userdata);
		device_unlock(&dev->dev);
		if (retval)
			break;
	}
	up_read(&pci_bus_sem);
}
EXPORT_SYMBOL_GPL(pci_walk_bus);

EXPORT_SYMBOL(pci_bus_alloc_resource);
EXPORT_SYMBOL_GPL(pci_bus_add_device);
EXPORT_SYMBOL(pci_bus_add_devices);
EXPORT_SYMBOL(pci_enable_bridges);
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
2fe2abf8 BH	21	void pci_bus_add_resource(struct pci_bus bus, struct resource res,
	22	unsigned int flags)
	23	{
	24	struct pci_bus_resource *bus_res;
	25
	26	bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
	27	if (!bus_res) {
	28	dev_err(&bus->dev, "can't add %pR resource\n", res);
	29	return;
	30	}
	31
	32	bus_res->res = res;
	33	bus_res->flags = flags;
	34	list_add_tail(&bus_res->list, &bus->resources);
	35	}
	36
	37	struct resource pci_bus_resource_n(const struct pci_bus bus, int n)
	38	{
	39	struct pci_bus_resource *bus_res;
	40
	41	if (n < PCI_BRIDGE_RESOURCE_NUM)
	42	return bus->resource[n];
	43
	44	n -= PCI_BRIDGE_RESOURCE_NUM;
	45	list_for_each_entry(bus_res, &bus->resources, list) {
	46	if (n-- == 0)
	47	return bus_res->res;
	48	}
	49	return NULL;
	50	}
	51	EXPORT_SYMBOL_GPL(pci_bus_resource_n);
	52
	53	void pci_bus_remove_resources(struct pci_bus *bus)
	54	{
	55	struct pci_bus_resource bus_res, tmp;
	56	int i;
	57
	58	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
7736a05a	59	bus->resource[i] = NULL;
2fe2abf8 BH	60
	61	list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
	62	list_del(&bus_res->list);
	63	kfree(bus_res);
	64	}
	65	}
	66
b126b470 BH	67	/*
	68	* Find the highest-address bus resource below the cursor "res". If the
	69	* cursor is NULL, return the highest resource.
	70	*/
	71	static struct resource pci_bus_find_resource_prev(struct pci_bus bus,
	72	unsigned int type,
	73	struct resource *res)
	74	{
	75	struct resource r, prev = NULL;
	76	int i;
	77
	78	pci_bus_for_each_resource(bus, r, i) {
	79	if (!r)
	80	continue;
	81
	82	if ((r->flags & IORESOURCE_TYPE_BITS) != type)
	83	continue;
	84
	85	/* If this resource is at or past the cursor, skip it */
	86	if (res) {
	87	if (r == res)
	88	continue;
	89	if (r->end > res->end)
	90	continue;
	91	if (r->end == res->end && r->start > res->start)
	92	continue;
	93	}
	94
	95	if (!prev)
	96	prev = r;
	97
	98	/*
	99	* A small resource is higher than a large one that ends at
	100	* the same address.
	101	*/
	102	if (r->end > prev->end \|\|
	103	(r->end == prev->end && r->start > prev->start))
	104	prev = r;
	105	}
	106
	107	return prev;
	108	}
	109
1da177e4 LT	110	/**
	111	* pci_bus_alloc_resource - allocate a resource from a parent bus
	112	* @bus: PCI bus
	113	* @res: resource to allocate
	114	* @size: size of resource to allocate
	115	* @align: alignment of resource to allocate
	116	* @min: minimum /proc/iomem address to allocate
	117	* @type_mask: IORESOURCE_* type flags
	118	* @alignf: resource alignment function
	119	* @alignf_data: data argument for resource alignment function
	120	*
	121	* Given the PCI bus a device resides on, the size, minimum address,
	122	* alignment and type, try to find an acceptable resource allocation
	123	* for a specific device resource.
	124	*/
	125	int
	126	pci_bus_alloc_resource(struct pci_bus bus, struct resource res,
e31dd6e4 GKH	127	resource_size_t size, resource_size_t align,
e31dd6e4 GKH	128	resource_size_t min, unsigned int type_mask,
b26b2d49	129	resource_size_t (alignf)(void ,
3b7a17fc	130	const struct resource *,
b26b2d49 DB	131	resource_size_t,
b26b2d49 DB	132	resource_size_t),
e31dd6e4	133	void *alignf_data)
1da177e4	134	{
b126b470	135	int ret = -ENOMEM;
89a74ecc	136	struct resource *r;
1f82de10	137	resource_size_t max = -1;
b126b470	138	unsigned int type = res->flags & IORESOURCE_TYPE_BITS;
1da177e4 LT	139
	140	type_mask \|= IORESOURCE_IO \| IORESOURCE_MEM;
	141
1f82de10 YL	142	/* don't allocate too high if the pref mem doesn't support 64bit*/
	143	if (!(res->flags & IORESOURCE_MEM_64))
	144	max = PCIBIOS_MAX_MEM_32;
	145
b126b470 BH	146	/* Look for space at highest addresses first */
	147	r = pci_bus_find_resource_prev(bus, type, NULL);
	148	for ( ; r; r = pci_bus_find_resource_prev(bus, type, r)) {
1da177e4 LT	149	/* type_mask must match */
	150	if ((res->flags ^ r->flags) & type_mask)
	151	continue;
	152
	153	/* We cannot allocate a non-prefetching resource
	154	from a pre-fetching area */
	155	if ((r->flags & IORESOURCE_PREFETCH) &&
	156	!(res->flags & IORESOURCE_PREFETCH))
	157	continue;
	158
	159	/* Ok, try it out.. */
688d1918 LT	160	ret = allocate_resource(r, res, size,
688d1918 LT	161	r->start ? : min,
1f82de10	162	max, align,
1da177e4 LT	163	alignf, alignf_data);
	164	if (ret == 0)
	165	break;
	166	}
	167	return ret;
	168	}
	169
	170	/**
3fa16fdb	171	* pci_bus_add_device - add a single device
1da177e4 LT	172	* @dev: device to add
	173	*
	174	* This adds a single pci device to the global
	175	* device list and adds sysfs and procfs entries
	176	*/
96bde06a	177	int pci_bus_add_device(struct pci_dev *dev)
1da177e4	178	{
b19441af GKH	179	int retval;
	180	retval = device_add(&dev->dev);
	181	if (retval)
	182	return retval;
1da177e4	183
8a1bc901	184	dev->is_added = 1;
1da177e4 LT	185	pci_proc_attach_device(dev);
1da177e4 LT	186	pci_create_sysfs_dev_files(dev);
b19441af	187	return 0;
1da177e4 LT	188	}
1da177e4 LT	189
876e501a YZ	190	/**
	191	* pci_bus_add_child - add a child bus
	192	* @bus: bus to add
	193	*
	194	* This adds sysfs entries for a single bus
	195	*/
	196	int pci_bus_add_child(struct pci_bus *bus)
	197	{
	198	int retval;
	199
	200	if (bus->bridge)
	201	bus->dev.parent = bus->bridge;
	202
	203	retval = device_register(&bus->dev);
	204	if (retval)
	205	return retval;
	206
	207	bus->is_added = 1;
	208
	209	retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
	210	if (retval)
	211	return retval;
	212
	213	retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);
	214
	215	/* Create legacy_io and legacy_mem files for this bus */
	216	pci_create_legacy_files(bus);
	217
	218	return retval;
	219	}
	220
1da177e4 LT	221	/**
	222	* pci_bus_add_devices - insert newly discovered PCI devices
	223	* @bus: bus to check for new devices
	224	*
	225	* Add newly discovered PCI devices (which are on the bus->devices
	226	* list) to the global PCI device list, add the sysfs and procfs
	227	* entries. Where a bridge is found, add the discovered bus to
	228	* the parents list of child buses, and recurse (breadth-first
	229	* to be compatible with 2.4)
	230	*
	231	* Call hotplug for each new devices.
	232	*/
c48f1670	233	void pci_bus_add_devices(const struct pci_bus *bus)
1da177e4 LT	234	{
1da177e4 LT	235	struct pci_dev *dev;
3fa16fdb	236	struct pci_bus *child;
b19441af	237	int retval;
1da177e4 LT	238
1da177e4 LT	239	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901 GKH	240	/* Skip already-added devices */
8a1bc901 GKH	241	if (dev->is_added)
1da177e4	242	continue;
b19441af GKH	243	retval = pci_bus_add_device(dev);
	244	if (retval)
	245	dev_err(&dev->dev, "Error adding device, continuing\n");
1da177e4 LT	246	}
	247
	248	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901	249	BUG_ON(!dev->is_added);
1da177e4	250
3fa16fdb	251	child = dev->subordinate;
1da177e4 LT	252	/*
	253	* If there is an unattached subordinate bus, attach
	254	* it and then scan for unattached PCI devices.
	255	*/
3fa16fdb YZ	256	if (!child)
	257	continue;
	258	if (list_empty(&child->node)) {
	259	down_write(&pci_bus_sem);
	260	list_add_tail(&child->node, &dev->bus->children);
	261	up_write(&pci_bus_sem);
	262	}
	263	pci_bus_add_devices(child);
	264
	265	/*
	266	* register the bus with sysfs as the parent is now
	267	* properly registered.
	268	*/
	269	if (child->is_added)
	270	continue;
876e501a	271	retval = pci_bus_add_child(child);
3fa16fdb	272	if (retval)
876e501a	273	dev_err(&dev->dev, "Error adding bus, continuing\n");
1da177e4 LT	274	}
	275	}
	276
	277	void pci_enable_bridges(struct pci_bus *bus)
	278	{
	279	struct pci_dev *dev;
95a62965	280	int retval;
1da177e4 LT	281
	282	list_for_each_entry(dev, &bus->devices, bus_list) {
	283	if (dev->subordinate) {
296ccb08	284	if (!pci_is_enabled(dev)) {
9dd90caf	285	retval = pci_enable_device(dev);
2eb5ebd3 JW	286	if (retval)
2eb5ebd3 JW	287	dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
9dd90caf AC	288	pci_set_master(dev);
9dd90caf AC	289	}
1da177e4 LT	290	pci_enable_bridges(dev->subordinate);
	291	}
	292	}
	293	}
	294
cecf4864 PM	295	/** pci_walk_bus - walk devices on/under bus, calling callback.
	296	* @top bus whose devices should be walked
	297	* @cb callback to be called for each device found
	298	* @userdata arbitrary pointer to be passed to callback.
	299	*
	300	* Walk the given bus, including any bridged devices
	301	* on buses under this bus. Call the provided callback
	302	* on each device found.
70298c6e ZY	303	*
	304	* We check the return of @cb each time. If it returns anything
	305	* other than 0, we break out.
	306	*
cecf4864	307	*/
70298c6e	308	void pci_walk_bus(struct pci_bus top, int (cb)(struct pci_dev , void ),
cecf4864 PM	309	void *userdata)
	310	{
	311	struct pci_dev *dev;
	312	struct pci_bus *bus;
	313	struct list_head *next;
70298c6e	314	int retval;
cecf4864 PM	315
cecf4864 PM	316	bus = top;
d71374da	317	down_read(&pci_bus_sem);
cecf4864 PM	318	next = top->devices.next;
	319	for (;;) {
	320	if (next == &bus->devices) {
	321	/* end of this bus, go up or finish */
	322	if (bus == top)
	323	break;
	324	next = bus->self->bus_list.next;
	325	bus = bus->self->bus;
	326	continue;
	327	}
	328	dev = list_entry(next, struct pci_dev, bus_list);
cecf4864 PM	329	if (dev->subordinate) {
	330	/* this is a pci-pci bridge, do its devices next */
	331	next = dev->subordinate->devices.next;
	332	bus = dev->subordinate;
	333	} else
	334	next = dev->bus_list.next;
cecf4864	335
d71374da	336	/* Run device routines with the device locked */
8e9394ce	337	device_lock(&dev->dev);
70298c6e	338	retval = cb(dev, userdata);
8e9394ce	339	device_unlock(&dev->dev);
70298c6e ZY	340	if (retval)
70298c6e ZY	341	break;
cecf4864	342	}
d71374da	343	up_read(&pci_bus_sem);
cecf4864	344	}
7c94def8	345	EXPORT_SYMBOL_GPL(pci_walk_bus);
cecf4864	346
1da177e4 LT	347	EXPORT_SYMBOL(pci_bus_alloc_resource);
	348	EXPORT_SYMBOL_GPL(pci_bus_add_device);
	349	EXPORT_SYMBOL(pci_bus_add_devices);
	350	EXPORT_SYMBOL(pci_enable_bridges);