drivers/pci/bus.c - kernel/common - Git at Google

 /*
  *	drivers/pci/bus.c
  *
  * From setup-res.c, by:
  *	Dave Rusling ([email protected])
  *	David Mosberger ([email protected])
  *	David Miller ([email protected])
  *	Ivan Kokshaysky ([email protected])
  */
 #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);
 	}
 }

 /**
  * 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);
 				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);
	/*
	* drivers/pci/bus.c
	*
	* From setup-res.c, by:
	* Dave Rusling ([email protected])
	* David Mosberger ([email protected])
	* David Miller ([email protected])
	* Ivan Kokshaysky ([email protected])
	*/
	#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);
	}
	}

	/**
	* 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);
	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);