8737d6a90c
Error checking is scattered through various layers of the dlpar code, leading to a somewhat opaque code structure. This patch consolidates error checking in one routine, simplifying the code a tad. There's also some whitespace cleanup here too. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Acked-by: John Rose <johnrose@austin.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
476 lines
9.7 KiB
C
476 lines
9.7 KiB
C
/*
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* Interface for Dynamic Logical Partitioning of I/O Slots on
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* RPA-compliant PPC64 platform.
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*
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* John Rose <johnrose@austin.ibm.com>
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* Linda Xie <lxie@us.ibm.com>
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*
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* October 2003
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*
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* Copyright (C) 2003 IBM.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <asm/pci-bridge.h>
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#include <asm/semaphore.h>
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#include <asm/rtas.h>
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#include <asm/vio.h>
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#include "../pci.h"
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#include "rpaphp.h"
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#include "rpadlpar.h"
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static DECLARE_MUTEX(rpadlpar_sem);
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#define DLPAR_MODULE_NAME "rpadlpar_io"
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#define NODE_TYPE_VIO 1
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#define NODE_TYPE_SLOT 2
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#define NODE_TYPE_PHB 3
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static struct device_node *find_vio_slot_node(char *drc_name)
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{
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struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
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struct device_node *dn = NULL;
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char *name;
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int rc;
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if (!parent)
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return NULL;
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while ((dn = of_get_next_child(parent, dn))) {
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rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
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if ((rc == 0) && (!strcmp(drc_name, name)))
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break;
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}
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return dn;
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}
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/* Find dlpar-capable pci node that contains the specified name and type */
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static struct device_node *find_php_slot_pci_node(char *drc_name,
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char *drc_type)
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{
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struct device_node *np = NULL;
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char *name;
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char *type;
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int rc;
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while ((np = of_find_node_by_type(np, "pci"))) {
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rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
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if (rc == 0)
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if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
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break;
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}
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return np;
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}
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static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
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{
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struct device_node *dn;
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dn = find_php_slot_pci_node(drc_name, "SLOT");
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if (dn) {
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*node_type = NODE_TYPE_SLOT;
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return dn;
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}
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dn = find_php_slot_pci_node(drc_name, "PHB");
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if (dn) {
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*node_type = NODE_TYPE_PHB;
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return dn;
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}
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dn = find_vio_slot_node(drc_name);
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if (dn) {
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*node_type = NODE_TYPE_VIO;
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return dn;
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}
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return NULL;
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}
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static struct slot *find_slot(struct device_node *dn)
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{
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struct list_head *tmp, *n;
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struct slot *slot;
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list_for_each_safe(tmp, n, &rpaphp_slot_head) {
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slot = list_entry(tmp, struct slot, rpaphp_slot_list);
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if (slot->dn == dn)
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return slot;
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}
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return NULL;
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}
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static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
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struct device_node *dev_dn)
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{
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struct pci_dev *tmp = NULL;
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struct device_node *child_dn;
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list_for_each_entry(tmp, &parent->devices, bus_list) {
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child_dn = pci_device_to_OF_node(tmp);
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if (child_dn == dev_dn)
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return tmp;
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}
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return NULL;
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}
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static void dlpar_pci_add_bus(struct device_node *dn)
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{
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struct pci_dn *pdn = PCI_DN(dn);
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struct pci_controller *phb = pdn->phb;
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struct pci_dev *dev = NULL;
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eeh_add_device_tree_early(dn);
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/* Add EADS device to PHB bus, adding new entry to bus->devices */
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dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
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if (!dev) {
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printk(KERN_ERR "%s: failed to create pci dev for %s\n",
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__FUNCTION__, dn->full_name);
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return;
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}
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
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dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
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of_scan_pci_bridge(dn, dev);
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pcibios_fixup_new_pci_devices(dev->subordinate,0);
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/* Claim new bus resources */
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pcibios_claim_one_bus(dev->bus);
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/* ioremap() for child bus, which may or may not succeed */
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remap_bus_range(dev->subordinate);
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/* Add new devices to global lists. Register in proc, sysfs. */
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pci_bus_add_devices(phb->bus);
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}
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static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
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{
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struct pci_dev *dev;
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struct pci_controller *phb;
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if (pcibios_find_pci_bus(dn))
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return -EINVAL;
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/* Add pci bus */
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dlpar_pci_add_bus(dn);
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/* Confirm new bridge dev was created */
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phb = PCI_DN(dn)->phb;
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dev = dlpar_find_new_dev(phb->bus, dn);
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if (!dev) {
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printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
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drc_name);
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return -EIO;
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}
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if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
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printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
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__FUNCTION__, dev->hdr_type, drc_name);
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return -EIO;
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}
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/* Add hotplug slot */
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if (rpaphp_add_slot(dn)) {
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printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
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__FUNCTION__, drc_name);
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return -EIO;
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}
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return 0;
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}
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static int dlpar_remove_root_bus(struct pci_controller *phb)
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{
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struct pci_bus *phb_bus;
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int rc;
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phb_bus = phb->bus;
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if (!(list_empty(&phb_bus->children) &&
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list_empty(&phb_bus->devices))) {
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return -EBUSY;
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}
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rc = pcibios_remove_root_bus(phb);
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if (rc)
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return -EIO;
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device_unregister(phb_bus->bridge);
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pci_remove_bus(phb_bus);
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return 0;
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}
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static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
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{
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struct slot *slot;
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struct pci_dn *pdn;
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int rc = 0;
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if (!pcibios_find_pci_bus(dn))
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return -EINVAL;
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slot = find_slot(dn);
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if (slot) {
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/* Remove hotplug slot */
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if (rpaphp_deregister_slot(slot)) {
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printk(KERN_ERR
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"%s: unable to remove hotplug slot %s\n",
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__FUNCTION__, drc_name);
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return -EIO;
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}
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}
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pdn = dn->data;
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BUG_ON(!pdn || !pdn->phb);
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rc = dlpar_remove_root_bus(pdn->phb);
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if (rc < 0)
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return rc;
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pdn->phb = NULL;
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return 0;
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}
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static int dlpar_add_phb(char *drc_name, struct device_node *dn)
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{
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struct pci_controller *phb;
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if (PCI_DN(dn) && PCI_DN(dn)->phb) {
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/* PHB already exists */
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return -EINVAL;
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}
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phb = init_phb_dynamic(dn);
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if (!phb)
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return -EIO;
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if (rpaphp_add_slot(dn)) {
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printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
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__FUNCTION__, drc_name);
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return -EIO;
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}
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return 0;
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}
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static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
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{
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if (vio_find_node(dn))
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return -EINVAL;
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if (!vio_register_device_node(dn)) {
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printk(KERN_ERR
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"%s: failed to register vio node %s\n",
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__FUNCTION__, drc_name);
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return -EIO;
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}
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return 0;
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}
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/**
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* dlpar_add_slot - DLPAR add an I/O Slot
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* @drc_name: drc-name of newly added slot
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*
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* Make the hotplug module and the kernel aware
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* of a newly added I/O Slot.
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* Return Codes -
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* 0 Success
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* -ENODEV Not a valid drc_name
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* -EINVAL Slot already added
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* -ERESTARTSYS Signalled before obtaining lock
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* -EIO Internal PCI Error
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*/
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int dlpar_add_slot(char *drc_name)
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{
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struct device_node *dn = NULL;
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int node_type;
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int rc = -EIO;
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if (down_interruptible(&rpadlpar_sem))
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return -ERESTARTSYS;
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/* Find newly added node */
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dn = find_dlpar_node(drc_name, &node_type);
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if (!dn) {
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rc = -ENODEV;
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goto exit;
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}
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switch (node_type) {
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case NODE_TYPE_VIO:
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rc = dlpar_add_vio_slot(drc_name, dn);
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break;
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case NODE_TYPE_SLOT:
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rc = dlpar_add_pci_slot(drc_name, dn);
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break;
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case NODE_TYPE_PHB:
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rc = dlpar_add_phb(drc_name, dn);
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break;
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}
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printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
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exit:
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up(&rpadlpar_sem);
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return rc;
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}
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/**
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* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
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* @drc_name: drc-name of newly added slot
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*
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* Remove the kernel and hotplug representations
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* of an I/O Slot.
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* Return Codes:
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* 0 Success
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* -EINVAL Vio dev doesn't exist
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*/
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static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
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{
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struct vio_dev *vio_dev;
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vio_dev = vio_find_node(dn);
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if (!vio_dev)
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return -EINVAL;
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vio_unregister_device(vio_dev);
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return 0;
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}
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/**
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* dlpar_remove_slot - DLPAR remove a PCI I/O Slot
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* @drc_name: drc-name of newly added slot
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*
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* Remove the kernel and hotplug representations
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* of a PCI I/O Slot.
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* Return Codes:
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* 0 Success
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* -ENODEV Not a valid drc_name
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* -EIO Internal PCI Error
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*/
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int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
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{
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struct pci_bus *bus;
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struct slot *slot;
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bus = pcibios_find_pci_bus(dn);
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if (!bus)
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return -EINVAL;
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slot = find_slot(dn);
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if (slot) {
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/* Remove hotplug slot */
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if (rpaphp_deregister_slot(slot)) {
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printk(KERN_ERR
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"%s: unable to remove hotplug slot %s\n",
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__FUNCTION__, drc_name);
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return -EIO;
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}
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} else {
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struct pci_dev *dev, *tmp;
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list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
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eeh_remove_bus_device(dev);
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pci_remove_bus_device(dev);
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}
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}
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if (unmap_bus_range(bus)) {
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printk(KERN_ERR "%s: failed to unmap bus range\n",
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__FUNCTION__);
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return -ERANGE;
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}
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BUG_ON(!bus->self);
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pci_remove_bus_device(bus->self);
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return 0;
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}
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/**
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* dlpar_remove_slot - DLPAR remove an I/O Slot
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* @drc_name: drc-name of newly added slot
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*
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* Remove the kernel and hotplug representations
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* of an I/O Slot.
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* Return Codes:
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* 0 Success
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* -ENODEV Not a valid drc_name
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* -EINVAL Slot already removed
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* -ERESTARTSYS Signalled before obtaining lock
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* -EIO Internal Error
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*/
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int dlpar_remove_slot(char *drc_name)
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{
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struct device_node *dn;
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int node_type;
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int rc = 0;
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if (down_interruptible(&rpadlpar_sem))
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return -ERESTARTSYS;
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dn = find_dlpar_node(drc_name, &node_type);
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if (!dn) {
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rc = -ENODEV;
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goto exit;
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}
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switch (node_type) {
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case NODE_TYPE_VIO:
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rc = dlpar_remove_vio_slot(drc_name, dn);
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break;
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case NODE_TYPE_PHB:
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rc = dlpar_remove_phb(drc_name, dn);
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break;
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case NODE_TYPE_SLOT:
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rc = dlpar_remove_pci_slot(drc_name, dn);
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break;
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}
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printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
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exit:
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up(&rpadlpar_sem);
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return rc;
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}
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static inline int is_dlpar_capable(void)
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{
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int rc = rtas_token("ibm,configure-connector");
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return (int) (rc != RTAS_UNKNOWN_SERVICE);
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}
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int __init rpadlpar_io_init(void)
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{
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int rc = 0;
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if (!is_dlpar_capable()) {
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printk(KERN_WARNING "%s: partition not DLPAR capable\n",
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__FUNCTION__);
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return -EPERM;
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}
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rc = dlpar_sysfs_init();
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return rc;
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}
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void rpadlpar_io_exit(void)
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{
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dlpar_sysfs_exit();
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return;
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}
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module_init(rpadlpar_io_init);
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module_exit(rpadlpar_io_exit);
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MODULE_LICENSE("GPL");
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