[linux-2.6-block.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);
	}
}

/**
 * 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;

	pci_fixup_device(pci_fixup_final, dev);

	retval = pcibios_add_device(dev);
	if (retval)
		return 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;

	/* 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;

		retval = cb(dev, userdata);
		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
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
1da177e4 LT	101	/**
	102	* pci_bus_alloc_resource - allocate a resource from a parent bus
	103	* @bus: PCI bus
	104	* @res: resource to allocate
	105	* @size: size of resource to allocate
	106	* @align: alignment of resource to allocate
	107	* @min: minimum /proc/iomem address to allocate
	108	* @type_mask: IORESOURCE_* type flags
	109	* @alignf: resource alignment function
	110	* @alignf_data: data argument for resource alignment function
	111	*
	112	* Given the PCI bus a device resides on, the size, minimum address,
	113	* alignment and type, try to find an acceptable resource allocation
	114	* for a specific device resource.
	115	*/
	116	int
	117	pci_bus_alloc_resource(struct pci_bus bus, struct resource res,
e31dd6e4 GKH	118	resource_size_t size, resource_size_t align,
e31dd6e4 GKH	119	resource_size_t min, unsigned int type_mask,
b26b2d49	120	resource_size_t (alignf)(void ,
3b7a17fc	121	const struct resource *,
b26b2d49 DB	122	resource_size_t,
b26b2d49 DB	123	resource_size_t),
e31dd6e4	124	void *alignf_data)
1da177e4	125	{
6db45b76	126	int i, ret = -ENOMEM;
89a74ecc	127	struct resource *r;
1f82de10	128	resource_size_t max = -1;
1da177e4 LT	129
	130	type_mask \|= IORESOURCE_IO \| IORESOURCE_MEM;
	131
1f82de10 YL	132	/* don't allocate too high if the pref mem doesn't support 64bit*/
	133	if (!(res->flags & IORESOURCE_MEM_64))
	134	max = PCIBIOS_MAX_MEM_32;
	135
6db45b76 BH	136	pci_bus_for_each_resource(bus, r, i) {
	137	if (!r)
	138	continue;
	139
1da177e4 LT	140	/* type_mask must match */
	141	if ((res->flags ^ r->flags) & type_mask)
	142	continue;
	143
	144	/* We cannot allocate a non-prefetching resource
	145	from a pre-fetching area */
	146	if ((r->flags & IORESOURCE_PREFETCH) &&
	147	!(res->flags & IORESOURCE_PREFETCH))
	148	continue;
	149
	150	/* Ok, try it out.. */
688d1918 LT	151	ret = allocate_resource(r, res, size,
688d1918 LT	152	r->start ? : min,
1f82de10	153	max, align,
1da177e4 LT	154	alignf, alignf_data);
	155	if (ret == 0)
	156	break;
	157	}
	158	return ret;
	159	}
	160
	161	/**
3fa16fdb	162	* pci_bus_add_device - add a single device
1da177e4 LT	163	* @dev: device to add
	164	*
	165	* This adds a single pci device to the global
	166	* device list and adds sysfs and procfs entries
	167	*/
96bde06a	168	int pci_bus_add_device(struct pci_dev *dev)
1da177e4	169	{
b19441af	170	int retval;
735bff10	171
95df8b87	172	pci_fixup_device(pci_fixup_final, dev);
eca0d467 MG	173
	174	retval = pcibios_add_device(dev);
	175	if (retval)
	176	return retval;
	177
b19441af GKH	178	retval = device_add(&dev->dev);
	179	if (retval)
	180	return retval;
1da177e4	181
8a1bc901	182	dev->is_added = 1;
1da177e4 LT	183	pci_proc_attach_device(dev);
1da177e4 LT	184	pci_create_sysfs_dev_files(dev);
b19441af	185	return 0;
1da177e4 LT	186	}
1da177e4 LT	187
876e501a YZ	188	/**
	189	* pci_bus_add_child - add a child bus
	190	* @bus: bus to add
	191	*
	192	* This adds sysfs entries for a single bus
	193	*/
	194	int pci_bus_add_child(struct pci_bus *bus)
	195	{
	196	int retval;
	197
	198	if (bus->bridge)
	199	bus->dev.parent = bus->bridge;
	200
	201	retval = device_register(&bus->dev);
	202	if (retval)
	203	return retval;
	204
	205	bus->is_added = 1;
	206
876e501a YZ	207	/* Create legacy_io and legacy_mem files for this bus */
	208	pci_create_legacy_files(bus);
	209
	210	return retval;
	211	}
	212
1da177e4 LT	213	/**
	214	* pci_bus_add_devices - insert newly discovered PCI devices
	215	* @bus: bus to check for new devices
	216	*
	217	* Add newly discovered PCI devices (which are on the bus->devices
	218	* list) to the global PCI device list, add the sysfs and procfs
	219	* entries. Where a bridge is found, add the discovered bus to
	220	* the parents list of child buses, and recurse (breadth-first
	221	* to be compatible with 2.4)
	222	*
	223	* Call hotplug for each new devices.
	224	*/
c48f1670	225	void pci_bus_add_devices(const struct pci_bus *bus)
1da177e4 LT	226	{
1da177e4 LT	227	struct pci_dev *dev;
3fa16fdb	228	struct pci_bus *child;
b19441af	229	int retval;
1da177e4 LT	230
1da177e4 LT	231	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901 GKH	232	/* Skip already-added devices */
8a1bc901 GKH	233	if (dev->is_added)
1da177e4	234	continue;
b19441af GKH	235	retval = pci_bus_add_device(dev);
	236	if (retval)
	237	dev_err(&dev->dev, "Error adding device, continuing\n");
1da177e4 LT	238	}
	239
	240	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901	241	BUG_ON(!dev->is_added);
1da177e4	242
3fa16fdb	243	child = dev->subordinate;
1da177e4 LT	244	/*
	245	* If there is an unattached subordinate bus, attach
	246	* it and then scan for unattached PCI devices.
	247	*/
3fa16fdb YZ	248	if (!child)
	249	continue;
	250	if (list_empty(&child->node)) {
	251	down_write(&pci_bus_sem);
	252	list_add_tail(&child->node, &dev->bus->children);
	253	up_write(&pci_bus_sem);
	254	}
	255	pci_bus_add_devices(child);
	256
	257	/*
	258	* register the bus with sysfs as the parent is now
	259	* properly registered.
	260	*/
	261	if (child->is_added)
	262	continue;
876e501a	263	retval = pci_bus_add_child(child);
3fa16fdb	264	if (retval)
876e501a	265	dev_err(&dev->dev, "Error adding bus, continuing\n");
1da177e4 LT	266	}
	267	}
	268
	269	void pci_enable_bridges(struct pci_bus *bus)
	270	{
	271	struct pci_dev *dev;
95a62965	272	int retval;
1da177e4 LT	273
	274	list_for_each_entry(dev, &bus->devices, bus_list) {
	275	if (dev->subordinate) {
296ccb08	276	if (!pci_is_enabled(dev)) {
9dd90caf	277	retval = pci_enable_device(dev);
2eb5ebd3 JW	278	if (retval)
2eb5ebd3 JW	279	dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
9dd90caf AC	280	pci_set_master(dev);
9dd90caf AC	281	}
1da177e4 LT	282	pci_enable_bridges(dev->subordinate);
	283	}
	284	}
	285	}
	286
cecf4864 PM	287	/** pci_walk_bus - walk devices on/under bus, calling callback.
	288	* @top bus whose devices should be walked
	289	* @cb callback to be called for each device found
	290	* @userdata arbitrary pointer to be passed to callback.
	291	*
	292	* Walk the given bus, including any bridged devices
	293	* on buses under this bus. Call the provided callback
	294	* on each device found.
70298c6e ZY	295	*
	296	* We check the return of @cb each time. If it returns anything
	297	* other than 0, we break out.
	298	*
cecf4864	299	*/
70298c6e	300	void pci_walk_bus(struct pci_bus top, int (cb)(struct pci_dev , void ),
cecf4864 PM	301	void *userdata)
	302	{
	303	struct pci_dev *dev;
	304	struct pci_bus *bus;
	305	struct list_head *next;
70298c6e	306	int retval;
cecf4864 PM	307
cecf4864 PM	308	bus = top;
d71374da	309	down_read(&pci_bus_sem);
cecf4864 PM	310	next = top->devices.next;
	311	for (;;) {
	312	if (next == &bus->devices) {
	313	/* end of this bus, go up or finish */
	314	if (bus == top)
	315	break;
	316	next = bus->self->bus_list.next;
	317	bus = bus->self->bus;
	318	continue;
	319	}
	320	dev = list_entry(next, struct pci_dev, bus_list);
cecf4864 PM	321	if (dev->subordinate) {
	322	/* this is a pci-pci bridge, do its devices next */
	323	next = dev->subordinate->devices.next;
	324	bus = dev->subordinate;
	325	} else
	326	next = dev->bus_list.next;
cecf4864	327
70298c6e	328	retval = cb(dev, userdata);
70298c6e ZY	329	if (retval)
70298c6e ZY	330	break;
cecf4864	331	}
d71374da	332	up_read(&pci_bus_sem);
cecf4864	333	}
7c94def8	334	EXPORT_SYMBOL_GPL(pci_walk_bus);
cecf4864	335
1da177e4 LT	336	EXPORT_SYMBOL(pci_bus_alloc_resource);
	337	EXPORT_SYMBOL_GPL(pci_bus_add_device);
	338	EXPORT_SYMBOL(pci_bus_add_devices);
	339	EXPORT_SYMBOL(pci_enable_bridges);