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); }
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); }
struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) { struct acpi_device *device = root->device; struct pci_root_info *info = NULL; int domain = root->segment; int busnum = root->secondary.start; LIST_HEAD(resources); struct pci_bus *bus = NULL; struct pci_sysdata *sd; int node; #ifdef CONFIG_ACPI_NUMA int pxm; #endif if (pci_ignore_seg) domain = 0; if (domain && !pci_domains_supported) { printk(KERN_WARNING "pci_bus %04x:%02x: " "ignored (multiple domains not supported)\n", domain, busnum); return NULL; } node = -1; #ifdef CONFIG_ACPI_NUMA pxm = acpi_get_pxm(device->handle); if (pxm >= 0) node = pxm_to_node(pxm); if (node != -1) set_mp_bus_to_node(busnum, node); else #endif node = get_mp_bus_to_node(busnum); if (node != -1 && !node_online(node)) node = -1; info = kzalloc(sizeof(*info), GFP_KERNEL); if (!info) { printk(KERN_WARNING "pci_bus %04x:%02x: " "ignored (out of memory)\n", domain, busnum); return NULL; } sd = &info->sd; sd->domain = domain; sd->node = node; sd->companion = device; /* * Maybe the desired pci bus has been already scanned. In such case * it is unnecessary to scan the pci bus with the given domain,busnum. */ bus = pci_find_bus(domain, busnum); if (bus) { /* * If the desired bus exits, the content of bus->sysdata will * be replaced by sd. */ memcpy(bus->sysdata, sd, sizeof(*sd)); kfree(info); } else { probe_pci_root_info(info, device, busnum, domain); /* insert busn res at first */ pci_add_resource(&resources, &root->secondary); /* * _CRS with no apertures is normal, so only fall back to * defaults or native bridge info if we're ignoring _CRS. */ if (pci_use_crs) add_resources(info, &resources); else { free_pci_root_info_res(info); x86_pci_root_bus_resources(busnum, &resources); } if (!setup_mcfg_map(info, domain, (u8)root->secondary.start, (u8)root->secondary.end, root->mcfg_addr)) bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd, &resources); if (bus) { pci_scan_child_bus(bus); pci_set_host_bridge_release( to_pci_host_bridge(bus->bridge), release_pci_root_info, info); } else { pci_free_resource_list(&resources); __release_pci_root_info(info); } } /* After the PCI-E bus has been walked and all devices discovered, * configure any settings of the fabric that might be necessary. */ if (bus) { struct pci_bus *child; list_for_each_entry(child, &bus->children, node) pcie_bus_configure_settings(child); } if (bus && node != -1) { #ifdef CONFIG_ACPI_NUMA if (pxm >= 0) dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d (pxm %d)\n", node, pxm); #else dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); #endif } return bus; }
int cxl_pci_vphb_add(struct cxl_afu *afu) { struct pci_controller *phb; struct device_node *vphb_dn; struct device *parent; /* * If there are no AFU configuration records we won't have anything to * expose under the vPHB, so skip creating one, returning success since * this is still a valid case. This will also opt us out of EEH * handling since we won't have anything special to do if there are no * kernel drivers attached to the vPHB, and EEH handling is not yet * supported in the peer model. */ if (!afu->crs_num) return 0; /* The parent device is the adapter. Reuse the device node of * the adapter. * We don't seem to care what device node is used for the vPHB, * but tools such as lsvpd walk up the device parents looking * for a valid location code, so we might as well show devices * attached to the adapter as being located on that adapter. */ parent = afu->adapter->dev.parent; vphb_dn = parent->of_node; /* Alloc and setup PHB data structure */ phb = pcibios_alloc_controller(vphb_dn); if (!phb) return -ENODEV; /* Setup parent in sysfs */ phb->parent = parent; /* Setup the PHB using arch provided callback */ phb->ops = &cxl_pcie_pci_ops; phb->cfg_addr = NULL; phb->cfg_data = NULL; phb->private_data = afu; phb->controller_ops = cxl_pci_controller_ops; /* Scan the bus */ pcibios_scan_phb(phb); if (phb->bus == NULL) return -ENXIO; /* Set release hook on root bus */ pci_set_host_bridge_release(to_pci_host_bridge(phb->bus->bridge), pcibios_free_controller_deferred, (void *) phb); /* Claim resources. This might need some rework as well depending * whether we are doing probe-only or not, like assigning unassigned * resources etc... */ pcibios_claim_one_bus(phb->bus); /* Add probed PCI devices to the device model */ pci_bus_add_devices(phb->bus); afu->phb = phb; return 0; }