3c0c644188
Removing and then adding a PCI slot to a running partition results in a kernel panic. The current code attempts to add iospace for an entire root bus, which is inappropriate, and silently fails. When a pci device tries to use the iospace, a page fault is taken, as the iospace had not been mapped, and of course the page fault cannot be resolved. This only occurs for PCI adapters using pio, which may be why it hadn't been seen earlier (this seems to have been broken for a while). This patch has survived testing of dozens of slot add and removes. 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>
472 lines
9.6 KiB
C
472 lines
9.6 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 struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
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{
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struct pci_dn *pdn = dn->data;
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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 NULL;
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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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rpaphp_init_new_devs(dev->subordinate);
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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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/* Confirm new bridge dev was created */
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dev = dlpar_find_new_dev(phb->bus, dn);
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if (dev) {
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if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
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printk(KERN_ERR "%s: unexpected header type %d\n",
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__FUNCTION__, dev->hdr_type);
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return NULL;
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}
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}
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return dev;
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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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if (rpaphp_find_pci_bus(dn))
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return -EINVAL;
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/* Add pci bus */
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dev = dlpar_pci_add_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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/* 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 (!rpaphp_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_remove_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 = rpaphp_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_remove_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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rpaphp_unconfig_pci_adapter(bus);
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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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