// SPDX-License-Identifier: GPL-2.0 #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; 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) { pci_pme_active(dev, false); if (dev->is_added) { device_release_driver(&dev->dev); pci_proc_detach_device(dev); pci_remove_sysfs_dev_files(dev); dev->is_added = 0; } if (dev->bus->self) pcie_aspm_exit_link_state(dev); } static void pci_destroy_dev(struct pci_dev *dev) { if (!dev->dev.kobj.parent) return; device_del(&dev->dev); down_write(&pci_bus_sem); list_del(&dev->bus_list); up_write(&pci_bus_sem); pci_bridge_d3_update(dev); pci_free_resources(dev); put_device(&dev->dev); } void pci_remove_bus(struct pci_bus *bus) { pci_proc_detach_bus(bus); down_write(&pci_bus_sem); list_del(&bus->node); pci_bus_release_busn_res(bus); up_write(&pci_bus_sem); pci_remove_legacy_files(bus); if (bus->ops->remove_bus) bus->ops->remove_bus(bus); pcibios_remove_bus(bus); device_unregister(&bus->dev); } EXPORT_SYMBOL(pci_remove_bus); static void pci_stop_bus_device(struct pci_dev *dev) { struct pci_bus *bus = dev->subordinate; struct pci_dev *child, *tmp; /* * Stopping an SR-IOV PF device removes all the associated VFs, * which will update the bus->devices list and confuse the * iterator. Therefore, iterate in reverse so we remove the VFs * first, then the PF. */ if (bus) { list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) pci_stop_bus_device(child); } pci_stop_dev(dev); } static void pci_remove_bus_device(struct pci_dev *dev) { struct pci_bus *bus = dev->subordinate; struct pci_dev *child, *tmp; if (bus) { list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) pci_remove_bus_device(child); pci_remove_bus(bus); dev->subordinate = NULL; } pci_destroy_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). */ void pci_stop_and_remove_bus_device(struct pci_dev *dev) { pci_stop_bus_device(dev); pci_remove_bus_device(dev); } EXPORT_SYMBOL(pci_stop_and_remove_bus_device); void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) { pci_lock_rescan_remove(); pci_stop_and_remove_bus_device(dev); pci_unlock_rescan_remove(); } EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); void pci_stop_root_bus(struct pci_bus *bus) { struct pci_dev *child, *tmp; struct pci_host_bridge *host_bridge; if (!pci_is_root_bus(bus)) return; host_bridge = to_pci_host_bridge(bus->bridge); list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) pci_stop_bus_device(child); /* stop the host bridge */ device_release_driver(&host_bridge->dev); } EXPORT_SYMBOL_GPL(pci_stop_root_bus); void pci_remove_root_bus(struct pci_bus *bus) { struct pci_dev *child, *tmp; struct pci_host_bridge *host_bridge; if (!pci_is_root_bus(bus)) return; host_bridge = to_pci_host_bridge(bus->bridge); list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) pci_remove_bus_device(child); pci_remove_bus(bus); host_bridge->bus = NULL; /* remove the host bridge */ device_unregister(&host_bridge->dev); } EXPORT_SYMBOL_GPL(pci_remove_root_bus);