remove.c 4.0 KB
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#include <linux/pci.h>
#include <linux/module.h>
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#include <linux/pci-aspm.h>
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#include "pci.h"

static void pci_free_resources(struct pci_dev *dev)
{
	int i;

 	msi_remove_pci_irq_vectors(dev);

	pci_cleanup_rom(dev);
	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
		struct resource *res = dev->resource + i;
		if (res->parent)
			release_resource(res);
	}
}

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static void pci_stop_dev(struct pci_dev *dev)
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{
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	if (dev->is_added) {
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		pci_proc_detach_device(dev);
		pci_remove_sysfs_dev_files(dev);
		device_unregister(&dev->dev);
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		dev->is_added = 0;
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	}
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	if (dev->bus->self)
		pcie_aspm_exit_link_state(dev);
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}

static void pci_destroy_dev(struct pci_dev *dev)
{
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	/* Remove the device from the device lists, and prevent any further
	 * list accesses from this device */
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	down_write(&pci_bus_sem);
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	list_del(&dev->bus_list);
	dev->bus_list.next = dev->bus_list.prev = NULL;
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	up_write(&pci_bus_sem);
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	pci_free_resources(dev);
	pci_dev_put(dev);
}

/**
 * pci_remove_device_safe - remove an unused hotplug device
 * @dev: the device to remove
 *
 * Delete the device structure from the device lists and 
 * notify userspace (/sbin/hotplug), but only if the device
 * in question is not being used by a driver.
 * Returns 0 on success.
 */
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#if 0
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int pci_remove_device_safe(struct pci_dev *dev)
{
	if (pci_dev_driver(dev))
		return -EBUSY;
	pci_destroy_dev(dev);
	return 0;
}
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#endif  /*  0  */
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void pci_remove_bus(struct pci_bus *pci_bus)
{
	pci_proc_detach_bus(pci_bus);

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	down_write(&pci_bus_sem);
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	list_del(&pci_bus->node);
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	up_write(&pci_bus_sem);
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	if (!pci_bus->is_added)
		return;

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	pci_remove_legacy_files(pci_bus);
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	device_unregister(&pci_bus->dev);
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}
EXPORT_SYMBOL(pci_remove_bus);

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static void __pci_remove_behind_bridge(struct pci_dev *dev);
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/**
 * pci_remove_bus_device - remove a PCI device and any children
 * @dev: the device to remove
 *
 * Remove a PCI device from the device lists, informing the drivers
 * that the device has been removed.  We also remove any subordinate
 * buses and children in a depth-first manner.
 *
 * For each device we remove, delete the device structure from the
 * device lists, remove the /proc entry, and notify userspace
 * (/sbin/hotplug).
 */
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static void __pci_remove_bus_device(struct pci_dev *dev)
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{
	if (dev->subordinate) {
		struct pci_bus *b = dev->subordinate;

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		__pci_remove_behind_bridge(dev);
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		pci_remove_bus(b);
		dev->subordinate = NULL;
	}

	pci_destroy_dev(dev);
}
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void pci_remove_bus_device(struct pci_dev *dev)
{
	pci_stop_bus_device(dev);
	__pci_remove_bus_device(dev);
}
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static void __pci_remove_behind_bridge(struct pci_dev *dev)
{
	struct list_head *l, *n;

	if (dev->subordinate)
		list_for_each_safe(l, n, &dev->subordinate->devices)
			__pci_remove_bus_device(pci_dev_b(l));
}

static void pci_stop_behind_bridge(struct pci_dev *dev)
{
	struct list_head *l, *n;

	if (dev->subordinate)
		list_for_each_safe(l, n, &dev->subordinate->devices)
			pci_stop_bus_device(pci_dev_b(l));
}

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/**
 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 * @dev: PCI bridge device
 *
 * Remove all devices on the bus, except for the parent bridge.
 * This also removes any child buses, and any devices they may
 * contain in a depth-first manner.
 */
void pci_remove_behind_bridge(struct pci_dev *dev)
{
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	pci_stop_behind_bridge(dev);
	__pci_remove_behind_bridge(dev);
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}

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static void pci_stop_bus_devices(struct pci_bus *bus)
{
	struct list_head *l, *n;

	list_for_each_safe(l, n, &bus->devices) {
		struct pci_dev *dev = pci_dev_b(l);
		pci_stop_bus_device(dev);
	}
}

/**
 * pci_stop_bus_device - stop a PCI device and any children
 * @dev: the device to stop
 *
 * Stop a PCI device (detach the driver, remove from the global list
 * and so on). This also stop any subordinate buses and children in a
 * depth-first manner.
 */
void pci_stop_bus_device(struct pci_dev *dev)
{
	if (dev->subordinate)
		pci_stop_bus_devices(dev->subordinate);

	pci_stop_dev(dev);
}

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EXPORT_SYMBOL(pci_remove_bus_device);
EXPORT_SYMBOL(pci_remove_behind_bridge);
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EXPORT_SYMBOL_GPL(pci_stop_bus_device);