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c14f7ccc9f
Replace assignment of PCI domain IDs from atomic_inc_return() to ida_alloc(). Use two IDAs, one for static domain allocations (those which are defined in device tree) and second for dynamic allocations (all other). During removal of root bus / host bridge, also release the domain ID. The released ID can be reused again, for example when dynamically loading and unloading native PCI host bridge drivers. This change also allows to mix static device tree assignment and dynamic by kernel as all static allocations are reserved in dynamic pool. [bhelgaas: set "err" if "bus->domain_nr < 0"] Link: https://lore.kernel.org/r/20220714184130.5436-1-pali@kernel.org Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
173 lines
3.9 KiB
C
173 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/pci.h>
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#include <linux/module.h>
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#include "pci.h"
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static void pci_free_resources(struct pci_dev *dev)
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{
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int i;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *res = dev->resource + i;
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if (res->parent)
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release_resource(res);
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}
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}
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static void pci_stop_dev(struct pci_dev *dev)
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{
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pci_pme_active(dev, false);
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if (pci_dev_is_added(dev)) {
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device_release_driver(&dev->dev);
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pci_proc_detach_device(dev);
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pci_remove_sysfs_dev_files(dev);
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pci_dev_assign_added(dev, false);
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}
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}
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static void pci_destroy_dev(struct pci_dev *dev)
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{
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if (!dev->dev.kobj.parent)
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return;
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device_del(&dev->dev);
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down_write(&pci_bus_sem);
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list_del(&dev->bus_list);
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up_write(&pci_bus_sem);
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pcie_aspm_exit_link_state(dev);
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pci_bridge_d3_update(dev);
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pci_free_resources(dev);
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put_device(&dev->dev);
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}
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void pci_remove_bus(struct pci_bus *bus)
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{
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pci_proc_detach_bus(bus);
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down_write(&pci_bus_sem);
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list_del(&bus->node);
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pci_bus_release_busn_res(bus);
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up_write(&pci_bus_sem);
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pci_remove_legacy_files(bus);
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if (bus->ops->remove_bus)
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bus->ops->remove_bus(bus);
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pcibios_remove_bus(bus);
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device_unregister(&bus->dev);
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}
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EXPORT_SYMBOL(pci_remove_bus);
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static void pci_stop_bus_device(struct pci_dev *dev)
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{
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struct pci_bus *bus = dev->subordinate;
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struct pci_dev *child, *tmp;
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/*
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* Stopping an SR-IOV PF device removes all the associated VFs,
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* which will update the bus->devices list and confuse the
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* iterator. Therefore, iterate in reverse so we remove the VFs
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* first, then the PF.
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*/
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if (bus) {
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list_for_each_entry_safe_reverse(child, tmp,
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&bus->devices, bus_list)
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pci_stop_bus_device(child);
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}
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pci_stop_dev(dev);
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}
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static void pci_remove_bus_device(struct pci_dev *dev)
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{
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struct pci_bus *bus = dev->subordinate;
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struct pci_dev *child, *tmp;
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if (bus) {
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list_for_each_entry_safe(child, tmp,
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&bus->devices, bus_list)
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pci_remove_bus_device(child);
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pci_remove_bus(bus);
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dev->subordinate = NULL;
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}
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pci_destroy_dev(dev);
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}
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/**
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* pci_stop_and_remove_bus_device - remove a PCI device and any children
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* @dev: the device to remove
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*
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* Remove a PCI device from the device lists, informing the drivers
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* that the device has been removed. We also remove any subordinate
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* buses and children in a depth-first manner.
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*
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* For each device we remove, delete the device structure from the
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* device lists, remove the /proc entry, and notify userspace
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* (/sbin/hotplug).
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*/
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void pci_stop_and_remove_bus_device(struct pci_dev *dev)
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{
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pci_stop_bus_device(dev);
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pci_remove_bus_device(dev);
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}
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EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
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void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
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{
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pci_lock_rescan_remove();
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pci_stop_and_remove_bus_device(dev);
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pci_unlock_rescan_remove();
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}
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EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
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void pci_stop_root_bus(struct pci_bus *bus)
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{
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struct pci_dev *child, *tmp;
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struct pci_host_bridge *host_bridge;
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if (!pci_is_root_bus(bus))
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return;
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host_bridge = to_pci_host_bridge(bus->bridge);
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list_for_each_entry_safe_reverse(child, tmp,
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&bus->devices, bus_list)
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pci_stop_bus_device(child);
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/* stop the host bridge */
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device_release_driver(&host_bridge->dev);
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}
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EXPORT_SYMBOL_GPL(pci_stop_root_bus);
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void pci_remove_root_bus(struct pci_bus *bus)
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{
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struct pci_dev *child, *tmp;
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struct pci_host_bridge *host_bridge;
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if (!pci_is_root_bus(bus))
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return;
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host_bridge = to_pci_host_bridge(bus->bridge);
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list_for_each_entry_safe(child, tmp,
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&bus->devices, bus_list)
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pci_remove_bus_device(child);
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pci_remove_bus(bus);
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host_bridge->bus = NULL;
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#ifdef CONFIG_PCI_DOMAINS_GENERIC
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/* Release domain_nr if it was dynamically allocated */
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if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
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pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
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#endif
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/* remove the host bridge */
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device_del(&host_bridge->dev);
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}
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EXPORT_SYMBOL_GPL(pci_remove_root_bus);
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