1 /* 2 * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c" 3 * 4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> 5 * Copyright (C) 2005 International Business Machines 6 * 7 * Updates, 2005, John Rose <johnrose@austin.ibm.com> 8 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com> 9 * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 */ 16 17 #include <linux/pci.h> 18 #include <linux/export.h> 19 #include <asm/pci-bridge.h> 20 #include <asm/ppc-pci.h> 21 #include <asm/firmware.h> 22 #include <asm/eeh.h> 23 24 static struct pci_bus *find_bus_among_children(struct pci_bus *bus, 25 struct device_node *dn) 26 { 27 struct pci_bus *child = NULL; 28 struct pci_bus *tmp; 29 30 if (pci_bus_to_OF_node(bus) == dn) 31 return bus; 32 33 list_for_each_entry(tmp, &bus->children, node) { 34 child = find_bus_among_children(tmp, dn); 35 if (child) 36 break; 37 } 38 39 return child; 40 } 41 42 struct pci_bus *pci_find_bus_by_node(struct device_node *dn) 43 { 44 struct pci_dn *pdn = PCI_DN(dn); 45 46 if (!pdn || !pdn->phb || !pdn->phb->bus) 47 return NULL; 48 49 return find_bus_among_children(pdn->phb->bus, dn); 50 } 51 EXPORT_SYMBOL_GPL(pci_find_bus_by_node); 52 53 /** 54 * pcibios_release_device - release PCI device 55 * @dev: PCI device 56 * 57 * The function is called before releasing the indicated PCI device. 58 */ 59 void pcibios_release_device(struct pci_dev *dev) 60 { 61 struct pci_controller *phb = pci_bus_to_host(dev->bus); 62 63 eeh_remove_device(dev); 64 65 if (phb->controller_ops.release_device) 66 phb->controller_ops.release_device(dev); 67 } 68 69 /** 70 * pci_hp_remove_devices - remove all devices under this bus 71 * @bus: the indicated PCI bus 72 * 73 * Remove all of the PCI devices under this bus both from the 74 * linux pci device tree, and from the powerpc EEH address cache. 75 */ 76 void pci_hp_remove_devices(struct pci_bus *bus) 77 { 78 struct pci_dev *dev, *tmp; 79 struct pci_bus *child_bus; 80 81 /* First go down child busses */ 82 list_for_each_entry(child_bus, &bus->children, node) 83 pci_hp_remove_devices(child_bus); 84 85 pr_debug("PCI: Removing devices on bus %04x:%02x\n", 86 pci_domain_nr(bus), bus->number); 87 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { 88 pr_debug(" Removing %s...\n", pci_name(dev)); 89 pci_stop_and_remove_bus_device(dev); 90 } 91 } 92 EXPORT_SYMBOL_GPL(pci_hp_remove_devices); 93 94 /** 95 * pci_hp_add_devices - adds new pci devices to bus 96 * @bus: the indicated PCI bus 97 * 98 * This routine will find and fixup new pci devices under 99 * the indicated bus. This routine presumes that there 100 * might already be some devices under this bridge, so 101 * it carefully tries to add only new devices. (And that 102 * is how this routine differs from other, similar pcibios 103 * routines.) 104 */ 105 void pci_hp_add_devices(struct pci_bus *bus) 106 { 107 int slotno, mode, max; 108 struct pci_dev *dev; 109 struct pci_controller *phb; 110 struct device_node *dn = pci_bus_to_OF_node(bus); 111 112 eeh_add_device_tree_early(PCI_DN(dn)); 113 114 phb = pci_bus_to_host(bus); 115 116 mode = PCI_PROBE_NORMAL; 117 if (phb->controller_ops.probe_mode) 118 mode = phb->controller_ops.probe_mode(bus); 119 120 if (mode == PCI_PROBE_DEVTREE) { 121 /* use ofdt-based probe */ 122 of_rescan_bus(dn, bus); 123 } else if (mode == PCI_PROBE_NORMAL && 124 dn->child && PCI_DN(dn->child)) { 125 /* 126 * Use legacy probe. In the partial hotplug case, we 127 * probably have grandchildren devices unplugged. So 128 * we don't check the return value from pci_scan_slot() in 129 * order for fully rescan all the way down to pick them up. 130 * They can have been removed during partial hotplug. 131 */ 132 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 133 pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 134 pcibios_setup_bus_devices(bus); 135 max = bus->busn_res.start; 136 /* 137 * Scan bridges that are already configured. We don't touch 138 * them unless they are misconfigured (which will be done in 139 * the second scan below). 140 */ 141 for_each_pci_bridge(dev, bus) 142 max = pci_scan_bridge(bus, dev, max, 0); 143 144 /* Scan bridges that need to be reconfigured */ 145 for_each_pci_bridge(dev, bus) 146 max = pci_scan_bridge(bus, dev, max, 1); 147 } 148 pcibios_finish_adding_to_bus(bus); 149 } 150 EXPORT_SYMBOL_GPL(pci_hp_add_devices); 151