/* * Interface for Dynamic Logical Partitioning of I/O Slots on * RPA-compliant PPC64 platform. * * John Rose <johnrose@austin.ibm.com> * Linda Xie <lxie@us.ibm.com> * * October 2003 * * Copyright (C) 2003 IBM. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #undef DEBUG #include <linux/init.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/string.h> #include <linux/vmalloc.h> #include <asm/pci-bridge.h> #include <linux/mutex.h> #include <asm/rtas.h> #include <asm/vio.h> #include "../pci.h" #include "rpaphp.h" #include "rpadlpar.h" static DEFINE_MUTEX(rpadlpar_mutex); #define DLPAR_MODULE_NAME "rpadlpar_io" #define NODE_TYPE_VIO 1 #define NODE_TYPE_SLOT 2 #define NODE_TYPE_PHB 3 static struct device_node *find_vio_slot_node(char *drc_name) { struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); struct device_node *dn = NULL; char *name; int rc; if (!parent) return NULL; while ((dn = of_get_next_child(parent, dn))) { rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); if ((rc == 0) && (!strcmp(drc_name, name))) break; } return dn; } /* Find dlpar-capable pci node that contains the specified name and type */ static struct device_node *find_php_slot_pci_node(char *drc_name, char *drc_type) { struct device_node *np = NULL; char *name; char *type; int rc; while ((np = of_find_node_by_name(np, "pci"))) { rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); if (rc == 0) if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) break; } return np; } static struct device_node *find_dlpar_node(char *drc_name, int *node_type) { struct device_node *dn; dn = find_php_slot_pci_node(drc_name, "SLOT"); if (dn) { *node_type = NODE_TYPE_SLOT; return dn; } dn = find_php_slot_pci_node(drc_name, "PHB"); if (dn) { *node_type = NODE_TYPE_PHB; return dn; } dn = find_vio_slot_node(drc_name); if (dn) { *node_type = NODE_TYPE_VIO; return dn; } return NULL; } /** * find_php_slot - return hotplug slot structure for device node * @dn: target &device_node * * This routine will return the hotplug slot structure * for a given device node. Note that built-in PCI slots * may be dlpar-able, but not hot-pluggable, so this routine * will return NULL for built-in PCI slots. */ static struct slot *find_php_slot(struct device_node *dn) { struct list_head *tmp, *n; struct slot *slot; list_for_each_safe(tmp, n, &rpaphp_slot_head) { slot = list_entry(tmp, struct slot, rpaphp_slot_list); if (slot->dn == dn) return slot; } return NULL; } static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, struct device_node *dev_dn) { struct pci_dev *tmp = NULL; struct device_node *child_dn; list_for_each_entry(tmp, &parent->devices, bus_list) { child_dn = pci_device_to_OF_node(tmp); if (child_dn == dev_dn) return tmp; } return NULL; } static void dlpar_pci_add_bus(struct device_node *dn) { struct pci_dn *pdn = PCI_DN(dn); struct pci_controller *phb = pdn->phb; struct pci_dev *dev = NULL; eeh_add_device_tree_early(dn); /* Add EADS device to PHB bus, adding new entry to bus->devices */ dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); if (!dev) { printk(KERN_ERR "%s: failed to create pci dev for %s\n", __func__, dn->full_name); return; } /* Scan below the new bridge */ if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) of_scan_pci_bridge(dev); /* Map IO space for child bus, which may or may not succeed */ pcibios_map_io_space(dev->subordinate); /* Finish adding it : resource allocation, adding devices, etc... * Note that we need to perform the finish pass on the -parent- * bus of the EADS bridge so the bridge device itself gets * properly added */ pcibios_finish_adding_to_bus(phb->bus); } static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) { struct pci_dev *dev; struct pci_controller *phb; if (pcibios_find_pci_bus(dn)) return -EINVAL; /* Add pci bus */ dlpar_pci_add_bus(dn); /* Confirm new bridge dev was created */ phb = PCI_DN(dn)->phb; dev = dlpar_find_new_dev(phb->bus, dn); if (!dev) { printk(KERN_ERR "%s: unable to add bus %s\n", __func__, drc_name); return -EIO; } if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", __func__, dev->hdr_type, drc_name); return -EIO; } /* Add hotplug slot */ if (rpaphp_add_slot(dn)) { printk(KERN_ERR "%s: unable to add hotplug slot %s\n", __func__, drc_name); return -EIO; } return 0; } static int dlpar_remove_phb(char *drc_name, struct device_node *dn) { struct slot *slot; struct pci_dn *pdn; int rc = 0; if (!pcibios_find_pci_bus(dn)) return -EINVAL; /* If pci slot is hotplugable, use hotplug to remove it */ slot = find_php_slot(dn); if (slot && rpaphp_deregister_slot(slot)) { printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", __func__, drc_name); return -EIO; } pdn = dn->data; BUG_ON(!pdn || !pdn->phb); rc = remove_phb_dynamic(pdn->phb); if (rc < 0) return rc; pdn->phb = NULL; return 0; } static int dlpar_add_phb(char *drc_name, struct device_node *dn) { struct pci_controller *phb; if (PCI_DN(dn) && PCI_DN(dn)->phb) { /* PHB already exists */ return -EINVAL; } phb = init_phb_dynamic(dn); if (!phb) return -EIO; if (rpaphp_add_slot(dn)) { printk(KERN_ERR "%s: unable to add hotplug slot %s\n", __func__, drc_name); return -EIO; } return 0; } static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) { if (vio_find_node(dn)) return -EINVAL; if (!vio_register_device_node(dn)) { printk(KERN_ERR "%s: failed to register vio node %s\n", __func__, drc_name); return -EIO; } return 0; } /** * dlpar_add_slot - DLPAR add an I/O Slot * @drc_name: drc-name of newly added slot * * Make the hotplug module and the kernel aware of a newly added I/O Slot. * Return Codes: * 0 Success * -ENODEV Not a valid drc_name * -EINVAL Slot already added * -ERESTARTSYS Signalled before obtaining lock * -EIO Internal PCI Error */ int dlpar_add_slot(char *drc_name) { struct device_node *dn = NULL; int node_type; int rc = -EIO; if (mutex_lock_interruptible(&rpadlpar_mutex)) return -ERESTARTSYS; /* Find newly added node */ dn = find_dlpar_node(drc_name, &node_type); if (!dn) { rc = -ENODEV; goto exit; } switch (node_type) { case NODE_TYPE_VIO: rc = dlpar_add_vio_slot(drc_name, dn); break; case NODE_TYPE_SLOT: rc = dlpar_add_pci_slot(drc_name, dn); break; case NODE_TYPE_PHB: rc = dlpar_add_phb(drc_name, dn); break; } printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); exit: mutex_unlock(&rpadlpar_mutex); return rc; } /** * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot * @drc_name: drc-name of newly added slot * @dn: &device_node * * Remove the kernel and hotplug representations of an I/O Slot. * Return Codes: * 0 Success * -EINVAL Vio dev doesn't exist */ static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) { struct vio_dev *vio_dev; vio_dev = vio_find_node(dn); if (!vio_dev) return -EINVAL; vio_unregister_device(vio_dev); return 0; } /** * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot * @drc_name: drc-name of newly added slot * @dn: &device_node * * Remove the kernel and hotplug representations of a PCI I/O Slot. * Return Codes: * 0 Success * -ENODEV Not a valid drc_name * -EIO Internal PCI Error */ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) { struct pci_bus *bus; struct slot *slot; bus = pcibios_find_pci_bus(dn); if (!bus) return -EINVAL; pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", bus->self ? pci_name(bus->self) : "<!PHB!>"); slot = find_php_slot(dn); if (slot) { pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", pci_domain_nr(bus), bus->number); if (rpaphp_deregister_slot(slot)) { printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", __func__, drc_name); return -EIO; } } /* Remove all devices below slot */ pcibios_remove_pci_devices(bus); /* Unmap PCI IO space */ if (pcibios_unmap_io_space(bus)) { printk(KERN_ERR "%s: failed to unmap bus range\n", __func__); return -ERANGE; } /* Remove the EADS bridge device itself */ BUG_ON(!bus->self); pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); eeh_remove_bus_device(bus->self); pci_remove_bus_device(bus->self); return 0; } /** * dlpar_remove_slot - DLPAR remove an I/O Slot * @drc_name: drc-name of newly added slot * * Remove the kernel and hotplug representations of an I/O Slot. * Return Codes: * 0 Success * -ENODEV Not a valid drc_name * -EINVAL Slot already removed * -ERESTARTSYS Signalled before obtaining lock * -EIO Internal Error */ int dlpar_remove_slot(char *drc_name) { struct device_node *dn; int node_type; int rc = 0; if (mutex_lock_interruptible(&rpadlpar_mutex)) return -ERESTARTSYS; dn = find_dlpar_node(drc_name, &node_type); if (!dn) { rc = -ENODEV; goto exit; } switch (node_type) { case NODE_TYPE_VIO: rc = dlpar_remove_vio_slot(drc_name, dn); break; case NODE_TYPE_PHB: rc = dlpar_remove_phb(drc_name, dn); break; case NODE_TYPE_SLOT: rc = dlpar_remove_pci_slot(drc_name, dn); break; } vm_unmap_aliases(); printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); exit: mutex_unlock(&rpadlpar_mutex); return rc; } static inline int is_dlpar_capable(void) { int rc = rtas_token("ibm,configure-connector"); return (int) (rc != RTAS_UNKNOWN_SERVICE); } int __init rpadlpar_io_init(void) { int rc = 0; if (!is_dlpar_capable()) { printk(KERN_WARNING "%s: partition not DLPAR capable\n", __func__); return -EPERM; } rc = dlpar_sysfs_init(); return rc; } void rpadlpar_io_exit(void) { dlpar_sysfs_exit(); return; } module_init(rpadlpar_io_init); module_exit(rpadlpar_io_exit); MODULE_LICENSE("GPL");