diff options
Diffstat (limited to 'drivers/pci/hotplug/rpadlpar_core.c')
| -rw-r--r-- | drivers/pci/hotplug/rpadlpar_core.c | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c new file mode 100644 index 00000000..1e117c2a --- /dev/null +++ b/drivers/pci/hotplug/rpadlpar_core.c @@ -0,0 +1,472 @@ +/* + * 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_stop_and_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"); |