[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] = 0;

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

/**
 * 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 i, ret = -ENOMEM;
	struct resource *r;
	resource_size_t max = -1;

	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;

	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;

		/* 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);
				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(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++)
	59	bus->resource[i] = 0;
	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
1da177e4 LT	67	/**
	68	* pci_bus_alloc_resource - allocate a resource from a parent bus
	69	* @bus: PCI bus
	70	* @res: resource to allocate
	71	* @size: size of resource to allocate
	72	* @align: alignment of resource to allocate
	73	* @min: minimum /proc/iomem address to allocate
	74	* @type_mask: IORESOURCE_* type flags
	75	* @alignf: resource alignment function
	76	* @alignf_data: data argument for resource alignment function
	77	*
	78	* Given the PCI bus a device resides on, the size, minimum address,
	79	* alignment and type, try to find an acceptable resource allocation
	80	* for a specific device resource.
	81	*/
	82	int
	83	pci_bus_alloc_resource(struct pci_bus bus, struct resource res,
e31dd6e4 GKH	84	resource_size_t size, resource_size_t align,
e31dd6e4 GKH	85	resource_size_t min, unsigned int type_mask,
b26b2d49	86	resource_size_t (alignf)(void ,
3b7a17fc	87	const struct resource *,
b26b2d49 DB	88	resource_size_t,
b26b2d49 DB	89	resource_size_t),
e31dd6e4	90	void *alignf_data)
1da177e4 LT	91	{
1da177e4 LT	92	int i, ret = -ENOMEM;
89a74ecc	93	struct resource *r;
1f82de10	94	resource_size_t max = -1;
1da177e4 LT	95
	96	type_mask \|= IORESOURCE_IO \| IORESOURCE_MEM;
	97
1f82de10 YL	98	/* don't allocate too high if the pref mem doesn't support 64bit*/
	99	if (!(res->flags & IORESOURCE_MEM_64))
	100	max = PCIBIOS_MAX_MEM_32;
	101
89a74ecc	102	pci_bus_for_each_resource(bus, r, i) {
1da177e4 LT	103	if (!r)
	104	continue;
	105
	106	/* type_mask must match */
	107	if ((res->flags ^ r->flags) & type_mask)
	108	continue;
	109
	110	/* We cannot allocate a non-prefetching resource
	111	from a pre-fetching area */
	112	if ((r->flags & IORESOURCE_PREFETCH) &&
	113	!(res->flags & IORESOURCE_PREFETCH))
	114	continue;
	115
	116	/* Ok, try it out.. */
688d1918 LT	117	ret = allocate_resource(r, res, size,
688d1918 LT	118	r->start ? : min,
1f82de10	119	max, align,
1da177e4 LT	120	alignf, alignf_data);
	121	if (ret == 0)
	122	break;
	123	}
	124	return ret;
	125	}
	126
	127	/**
3fa16fdb	128	* pci_bus_add_device - add a single device
1da177e4 LT	129	* @dev: device to add
	130	*
	131	* This adds a single pci device to the global
	132	* device list and adds sysfs and procfs entries
	133	*/
96bde06a	134	int pci_bus_add_device(struct pci_dev *dev)
1da177e4	135	{
b19441af GKH	136	int retval;
	137	retval = device_add(&dev->dev);
	138	if (retval)
	139	return retval;
1da177e4	140
8a1bc901	141	dev->is_added = 1;
1da177e4 LT	142	pci_proc_attach_device(dev);
1da177e4 LT	143	pci_create_sysfs_dev_files(dev);
b19441af	144	return 0;
1da177e4 LT	145	}
1da177e4 LT	146
876e501a YZ	147	/**
	148	* pci_bus_add_child - add a child bus
	149	* @bus: bus to add
	150	*
	151	* This adds sysfs entries for a single bus
	152	*/
	153	int pci_bus_add_child(struct pci_bus *bus)
	154	{
	155	int retval;
	156
	157	if (bus->bridge)
	158	bus->dev.parent = bus->bridge;
	159
	160	retval = device_register(&bus->dev);
	161	if (retval)
	162	return retval;
	163
	164	bus->is_added = 1;
	165
	166	retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
	167	if (retval)
	168	return retval;
	169
	170	retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);
	171
	172	/* Create legacy_io and legacy_mem files for this bus */
	173	pci_create_legacy_files(bus);
	174
	175	return retval;
	176	}
	177
1da177e4 LT	178	/**
	179	* pci_bus_add_devices - insert newly discovered PCI devices
	180	* @bus: bus to check for new devices
	181	*
	182	* Add newly discovered PCI devices (which are on the bus->devices
	183	* list) to the global PCI device list, add the sysfs and procfs
	184	* entries. Where a bridge is found, add the discovered bus to
	185	* the parents list of child buses, and recurse (breadth-first
	186	* to be compatible with 2.4)
	187	*
	188	* Call hotplug for each new devices.
	189	*/
c48f1670	190	void pci_bus_add_devices(const struct pci_bus *bus)
1da177e4 LT	191	{
1da177e4 LT	192	struct pci_dev *dev;
3fa16fdb	193	struct pci_bus *child;
b19441af	194	int retval;
1da177e4 LT	195
1da177e4 LT	196	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901 GKH	197	/* Skip already-added devices */
8a1bc901 GKH	198	if (dev->is_added)
1da177e4	199	continue;
b19441af GKH	200	retval = pci_bus_add_device(dev);
	201	if (retval)
	202	dev_err(&dev->dev, "Error adding device, continuing\n");
1da177e4 LT	203	}
	204
	205	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901	206	BUG_ON(!dev->is_added);
1da177e4	207
3fa16fdb	208	child = dev->subordinate;
1da177e4 LT	209	/*
	210	* If there is an unattached subordinate bus, attach
	211	* it and then scan for unattached PCI devices.
	212	*/
3fa16fdb YZ	213	if (!child)
	214	continue;
	215	if (list_empty(&child->node)) {
	216	down_write(&pci_bus_sem);
	217	list_add_tail(&child->node, &dev->bus->children);
	218	up_write(&pci_bus_sem);
	219	}
	220	pci_bus_add_devices(child);
	221
	222	/*
	223	* register the bus with sysfs as the parent is now
	224	* properly registered.
	225	*/
	226	if (child->is_added)
	227	continue;
876e501a	228	retval = pci_bus_add_child(child);
3fa16fdb	229	if (retval)
876e501a	230	dev_err(&dev->dev, "Error adding bus, continuing\n");
1da177e4 LT	231	}
	232	}
	233
	234	void pci_enable_bridges(struct pci_bus *bus)
	235	{
	236	struct pci_dev *dev;
95a62965	237	int retval;
1da177e4 LT	238
	239	list_for_each_entry(dev, &bus->devices, bus_list) {
	240	if (dev->subordinate) {
296ccb08	241	if (!pci_is_enabled(dev)) {
9dd90caf AC	242	retval = pci_enable_device(dev);
	243	pci_set_master(dev);
	244	}
1da177e4 LT	245	pci_enable_bridges(dev->subordinate);
	246	}
	247	}
	248	}
	249
cecf4864 PM	250	/** pci_walk_bus - walk devices on/under bus, calling callback.
	251	* @top bus whose devices should be walked
	252	* @cb callback to be called for each device found
	253	* @userdata arbitrary pointer to be passed to callback.
	254	*
	255	* Walk the given bus, including any bridged devices
	256	* on buses under this bus. Call the provided callback
	257	* on each device found.
70298c6e ZY	258	*
	259	* We check the return of @cb each time. If it returns anything
	260	* other than 0, we break out.
	261	*
cecf4864	262	*/
70298c6e	263	void pci_walk_bus(struct pci_bus top, int (cb)(struct pci_dev , void ),
cecf4864 PM	264	void *userdata)
	265	{
	266	struct pci_dev *dev;
	267	struct pci_bus *bus;
	268	struct list_head *next;
70298c6e	269	int retval;
cecf4864 PM	270
cecf4864 PM	271	bus = top;
d71374da	272	down_read(&pci_bus_sem);
cecf4864 PM	273	next = top->devices.next;
	274	for (;;) {
	275	if (next == &bus->devices) {
	276	/* end of this bus, go up or finish */
	277	if (bus == top)
	278	break;
	279	next = bus->self->bus_list.next;
	280	bus = bus->self->bus;
	281	continue;
	282	}
	283	dev = list_entry(next, struct pci_dev, bus_list);
cecf4864 PM	284	if (dev->subordinate) {
	285	/* this is a pci-pci bridge, do its devices next */
	286	next = dev->subordinate->devices.next;
	287	bus = dev->subordinate;
	288	} else
	289	next = dev->bus_list.next;
cecf4864	290
d71374da	291	/* Run device routines with the device locked */
8e9394ce	292	device_lock(&dev->dev);
70298c6e	293	retval = cb(dev, userdata);
8e9394ce	294	device_unlock(&dev->dev);
70298c6e ZY	295	if (retval)
70298c6e ZY	296	break;
cecf4864	297	}
d71374da	298	up_read(&pci_bus_sem);
cecf4864	299	}
cecf4864	300
1da177e4 LT	301	EXPORT_SYMBOL(pci_bus_alloc_resource);
	302	EXPORT_SYMBOL_GPL(pci_bus_add_device);
	303	EXPORT_SYMBOL(pci_bus_add_devices);
	304	EXPORT_SYMBOL(pci_enable_bridges);