1 #include <linux/pci.h> 2 #include <linux/module.h> 3 #include <linux/pci-aspm.h> 4 #include "pci.h" 5 6 static void pci_free_resources(struct pci_dev *dev) 7 { 8 int i; 9 10 msi_remove_pci_irq_vectors(dev); 11 12 pci_cleanup_rom(dev); 13 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 14 struct resource *res = dev->resource + i; 15 if (res->parent) 16 release_resource(res); 17 } 18 } 19 20 static void pci_stop_dev(struct pci_dev *dev) 21 { 22 if (dev->is_added) { 23 pci_proc_detach_device(dev); 24 pci_remove_sysfs_dev_files(dev); 25 device_unregister(&dev->dev); 26 dev->is_added = 0; 27 } 28 29 if (dev->bus->self) 30 pcie_aspm_exit_link_state(dev); 31 } 32 33 static void pci_destroy_dev(struct pci_dev *dev) 34 { 35 down_write(&pci_bus_sem); 36 list_del(&dev->bus_list); 37 up_write(&pci_bus_sem); 38 39 pci_free_resources(dev); 40 pci_dev_put(dev); 41 } 42 43 void pci_remove_bus(struct pci_bus *bus) 44 { 45 pci_proc_detach_bus(bus); 46 47 down_write(&pci_bus_sem); 48 list_del(&bus->node); 49 pci_bus_release_busn_res(bus); 50 up_write(&pci_bus_sem); 51 if (!bus->is_added) 52 return; 53 54 pci_remove_legacy_files(bus); 55 device_unregister(&bus->dev); 56 } 57 EXPORT_SYMBOL(pci_remove_bus); 58 59 static void pci_stop_bus_device(struct pci_dev *dev) 60 { 61 struct pci_bus *bus = dev->subordinate; 62 struct pci_dev *child, *tmp; 63 64 /* 65 * Stopping an SR-IOV PF device removes all the associated VFs, 66 * which will update the bus->devices list and confuse the 67 * iterator. Therefore, iterate in reverse so we remove the VFs 68 * first, then the PF. 69 */ 70 if (bus) { 71 list_for_each_entry_safe_reverse(child, tmp, 72 &bus->devices, bus_list) 73 pci_stop_bus_device(child); 74 } 75 76 pci_stop_dev(dev); 77 } 78 79 static void pci_remove_bus_device(struct pci_dev *dev) 80 { 81 struct pci_bus *bus = dev->subordinate; 82 struct pci_dev *child, *tmp; 83 84 if (bus) { 85 list_for_each_entry_safe(child, tmp, 86 &bus->devices, bus_list) 87 pci_remove_bus_device(child); 88 89 pci_remove_bus(bus); 90 dev->subordinate = NULL; 91 } 92 93 pci_destroy_dev(dev); 94 } 95 96 /** 97 * pci_stop_and_remove_bus_device - remove a PCI device and any children 98 * @dev: the device to remove 99 * 100 * Remove a PCI device from the device lists, informing the drivers 101 * that the device has been removed. We also remove any subordinate 102 * buses and children in a depth-first manner. 103 * 104 * For each device we remove, delete the device structure from the 105 * device lists, remove the /proc entry, and notify userspace 106 * (/sbin/hotplug). 107 */ 108 void pci_stop_and_remove_bus_device(struct pci_dev *dev) 109 { 110 pci_stop_bus_device(dev); 111 pci_remove_bus_device(dev); 112 } 113 EXPORT_SYMBOL(pci_stop_and_remove_bus_device); 114 115 void pci_stop_root_bus(struct pci_bus *bus) 116 { 117 struct pci_dev *child, *tmp; 118 struct pci_host_bridge *host_bridge; 119 120 if (!pci_is_root_bus(bus)) 121 return; 122 123 host_bridge = to_pci_host_bridge(bus->bridge); 124 list_for_each_entry_safe_reverse(child, tmp, 125 &bus->devices, bus_list) 126 pci_stop_bus_device(child); 127 128 /* stop the host bridge */ 129 device_del(&host_bridge->dev); 130 } 131 132 void pci_remove_root_bus(struct pci_bus *bus) 133 { 134 struct pci_dev *child, *tmp; 135 struct pci_host_bridge *host_bridge; 136 137 if (!pci_is_root_bus(bus)) 138 return; 139 140 host_bridge = to_pci_host_bridge(bus->bridge); 141 list_for_each_entry_safe(child, tmp, 142 &bus->devices, bus_list) 143 pci_remove_bus_device(child); 144 pci_remove_bus(bus); 145 host_bridge->bus = NULL; 146 147 /* remove the host bridge */ 148 put_device(&host_bridge->dev); 149 } 150