1 /* 2 * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code 3 * for RPA-compliant PPC64 platform. 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 * 10 * All rights reserved. 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or (at 15 * your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 20 * NON INFRINGEMENT. See the GNU General Public License for more 21 * details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 #include <linux/pci.h> 29 #include <linux/export.h> 30 #include <asm/pci-bridge.h> 31 #include <asm/ppc-pci.h> 32 #include <asm/firmware.h> 33 #include <asm/eeh.h> 34 35 static struct pci_bus * 36 find_bus_among_children(struct pci_bus *bus, 37 struct device_node *dn) 38 { 39 struct pci_bus *child = NULL; 40 struct list_head *tmp; 41 struct device_node *busdn; 42 43 busdn = pci_bus_to_OF_node(bus); 44 if (busdn == dn) 45 return bus; 46 47 list_for_each(tmp, &bus->children) { 48 child = find_bus_among_children(pci_bus_b(tmp), dn); 49 if (child) 50 break; 51 }; 52 return child; 53 } 54 55 struct pci_bus * 56 pcibios_find_pci_bus(struct device_node *dn) 57 { 58 struct pci_dn *pdn = dn->data; 59 60 if (!pdn || !pdn->phb || !pdn->phb->bus) 61 return NULL; 62 63 return find_bus_among_children(pdn->phb->bus, dn); 64 } 65 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus); 66 67 /** 68 * __pcibios_remove_pci_devices - remove all devices under this bus 69 * @bus: the indicated PCI bus 70 * @purge_pe: destroy the PE on removal of PCI devices 71 * 72 * Remove all of the PCI devices under this bus both from the 73 * linux pci device tree, and from the powerpc EEH address cache. 74 * By default, the corresponding PE will be destroied during the 75 * normal PCI hotplug path. For PCI hotplug during EEH recovery, 76 * the corresponding PE won't be destroied and deallocated. 77 */ 78 void __pcibios_remove_pci_devices(struct pci_bus *bus, int purge_pe) 79 { 80 struct pci_dev *dev, *tmp; 81 struct pci_bus *child_bus; 82 83 /* First go down child busses */ 84 list_for_each_entry(child_bus, &bus->children, node) 85 __pcibios_remove_pci_devices(child_bus, purge_pe); 86 87 pr_debug("PCI: Removing devices on bus %04x:%02x\n", 88 pci_domain_nr(bus), bus->number); 89 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 90 pr_debug(" * Removing %s...\n", pci_name(dev)); 91 eeh_remove_bus_device(dev, purge_pe); 92 pci_stop_and_remove_bus_device(dev); 93 } 94 } 95 96 /** 97 * pcibios_remove_pci_devices - remove all devices under this bus 98 * 99 * Remove all of the PCI devices under this bus both from the 100 * linux pci device tree, and from the powerpc EEH address cache. 101 */ 102 void pcibios_remove_pci_devices(struct pci_bus *bus) 103 { 104 __pcibios_remove_pci_devices(bus, 1); 105 } 106 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices); 107 108 /** 109 * pcibios_add_pci_devices - adds new pci devices to bus 110 * 111 * This routine will find and fixup new pci devices under 112 * the indicated bus. This routine presumes that there 113 * might already be some devices under this bridge, so 114 * it carefully tries to add only new devices. (And that 115 * is how this routine differs from other, similar pcibios 116 * routines.) 117 */ 118 void pcibios_add_pci_devices(struct pci_bus * bus) 119 { 120 int slotno, num, mode, pass, max; 121 struct pci_dev *dev; 122 struct device_node *dn = pci_bus_to_OF_node(bus); 123 124 eeh_add_device_tree_early(dn); 125 126 mode = PCI_PROBE_NORMAL; 127 if (ppc_md.pci_probe_mode) 128 mode = ppc_md.pci_probe_mode(bus); 129 130 if (mode == PCI_PROBE_DEVTREE) { 131 /* use ofdt-based probe */ 132 of_rescan_bus(dn, bus); 133 } else if (mode == PCI_PROBE_NORMAL) { 134 /* use legacy probe */ 135 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 136 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 137 if (!num) 138 return; 139 pcibios_setup_bus_devices(bus); 140 max = bus->busn_res.start; 141 for (pass=0; pass < 2; pass++) 142 list_for_each_entry(dev, &bus->devices, bus_list) { 143 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 144 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 145 max = pci_scan_bridge(bus, dev, max, pass); 146 } 147 } 148 pcibios_finish_adding_to_bus(bus); 149 } 150 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); 151 152 struct pci_controller *init_phb_dynamic(struct device_node *dn) 153 { 154 struct pci_controller *phb; 155 156 pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name); 157 158 phb = pcibios_alloc_controller(dn); 159 if (!phb) 160 return NULL; 161 rtas_setup_phb(phb); 162 pci_process_bridge_OF_ranges(phb, dn, 0); 163 164 pci_devs_phb_init_dynamic(phb); 165 166 /* Create EEH devices for the PHB */ 167 eeh_dev_phb_init_dynamic(phb); 168 169 if (dn->child) 170 eeh_add_device_tree_early(dn); 171 172 pcibios_scan_phb(phb); 173 pcibios_finish_adding_to_bus(phb->bus); 174 175 return phb; 176 } 177 EXPORT_SYMBOL_GPL(init_phb_dynamic); 178 179 /* RPA-specific bits for removing PHBs */ 180 int remove_phb_dynamic(struct pci_controller *phb) 181 { 182 struct pci_bus *b = phb->bus; 183 struct resource *res; 184 int rc, i; 185 186 pr_debug("PCI: Removing PHB %04x:%02x...\n", 187 pci_domain_nr(b), b->number); 188 189 /* We cannot to remove a root bus that has children */ 190 if (!(list_empty(&b->children) && list_empty(&b->devices))) 191 return -EBUSY; 192 193 /* We -know- there aren't any child devices anymore at this stage 194 * and thus, we can safely unmap the IO space as it's not in use 195 */ 196 res = &phb->io_resource; 197 if (res->flags & IORESOURCE_IO) { 198 rc = pcibios_unmap_io_space(b); 199 if (rc) { 200 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", 201 __func__, b->name); 202 return 1; 203 } 204 } 205 206 /* Unregister the bridge device from sysfs and remove the PCI bus */ 207 device_unregister(b->bridge); 208 phb->bus = NULL; 209 pci_remove_bus(b); 210 211 /* Now release the IO resource */ 212 if (res->flags & IORESOURCE_IO) 213 release_resource(res); 214 215 /* Release memory resources */ 216 for (i = 0; i < 3; ++i) { 217 res = &phb->mem_resources[i]; 218 if (!(res->flags & IORESOURCE_MEM)) 219 continue; 220 release_resource(res); 221 } 222 223 /* Free pci_controller data structure */ 224 pcibios_free_controller(phb); 225 226 return 0; 227 } 228 EXPORT_SYMBOL_GPL(remove_phb_dynamic); 229