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#include <linux/pci.h>
#include <linux/module.h>
#include <linux/pci-aspm.h>
#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);
}
}
static void pci_stop_dev(struct pci_dev *dev)
{
if (dev->is_added) {
pci_proc_detach_device(dev);
pci_remove_sysfs_dev_files(dev);
device_unregister(&dev->dev);
dev->is_added = 0;
}
if (dev->bus->self)
pcie_aspm_exit_link_state(dev);
}
static void pci_destroy_dev(struct pci_dev *dev)
{
/* Remove the device from the device lists, and prevent any further
* list accesses from this device */
down_write(&pci_bus_sem);
list_del(&dev->bus_list);
dev->bus_list.next = dev->bus_list.prev = NULL;
up_write(&pci_bus_sem);
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.
*/
#if 0
int pci_remove_device_safe(struct pci_dev *dev)
{
if (pci_dev_driver(dev))
return -EBUSY;
pci_destroy_dev(dev);
return 0;
}
#endif /* 0 */
void pci_remove_bus(struct pci_bus *pci_bus)
{
pci_proc_detach_bus(pci_bus);
down_write(&pci_bus_sem);
list_del(&pci_bus->node);
pci_bus_release_busn_res(pci_bus);
up_write(&pci_bus_sem);
if (!pci_bus->is_added)
return;
pci_remove_legacy_files(pci_bus);
device_unregister(&pci_bus->dev);
}
EXPORT_SYMBOL(pci_remove_bus);
static void __pci_remove_behind_bridge(struct pci_dev *dev);
static void pci_stop_bus_device(struct pci_dev *dev);
/**
* pci_stop_and_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).
*/
static void __pci_remove_bus_device(struct pci_dev *dev)
{
if (dev->subordinate) {
struct pci_bus *b = dev->subordinate;
__pci_remove_behind_bridge(dev);
pci_remove_bus(b);
dev->subordinate = NULL;
}
pci_destroy_dev(dev);
}
void pci_stop_and_remove_bus_device(struct pci_dev *dev)
{
pci_stop_bus_device(dev);
__pci_remove_bus_device(dev);
}
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_bus_devices(struct pci_bus *bus)
{
struct list_head *l, *n;
/*
* VFs could be removed by pci_stop_and_remove_bus_device() in the
* pci_stop_bus_devices() code path for PF.
* aka, bus->devices get updated in the process.
* but VFs are inserted after PFs when SRIOV is enabled for PF,
* We can iterate the list backwards to get prev valid PF instead
* of removed VF.
*/
list_for_each_prev_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.
*/
static void pci_stop_bus_device(struct pci_dev *dev)
{
if (dev->subordinate)
pci_stop_bus_devices(dev->subordinate);
pci_stop_dev(dev);
}
EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
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