504 lines
10 KiB
C
504 lines
10 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 <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 "../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 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_php_slot_vio_node(char *drc_name)
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{
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struct device_node *child;
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struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
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char *loc_code;
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if (!parent)
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return NULL;
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for (child = of_get_next_child(parent, NULL);
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child; child = of_get_next_child(parent, child)) {
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loc_code = get_property(child, "ibm,loc-code", NULL);
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if (loc_code && !strncmp(loc_code, drc_name, strlen(drc_name)))
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return child;
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}
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return NULL;
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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_newly_added_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_php_slot_vio_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(char *drc_name)
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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 (strcmp(slot->location, drc_name) == 0)
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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 void rpadlpar_claim_one_bus(struct pci_bus *b)
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{
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struct list_head *ld;
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struct pci_bus *child_bus;
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for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
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struct pci_dev *dev = pci_dev_b(ld);
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int i;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *r = &dev->resource[i];
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if (r->parent || !r->start || !r->flags)
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continue;
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rpaphp_claim_resource(dev, i);
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}
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}
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list_for_each_entry(child_bus, &b->children, node)
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rpadlpar_claim_one_bus(child_bus);
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}
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static int pci_add_secondary_bus(struct device_node *dn,
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struct pci_dev *bridge_dev)
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{
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struct pci_controller *hose = dn->phb;
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struct pci_bus *child;
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u8 sec_busno;
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/* Get busno of downstream bus */
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pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
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/* Allocate and add to children of bridge_dev->bus */
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child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
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if (!child) {
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printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
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return -ENOMEM;
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}
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sprintf(child->name, "PCI Bus #%02x", child->number);
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/* Fixup subordinate bridge bases and resources */
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pcibios_fixup_bus(child);
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/* Claim new bus resources */
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rpadlpar_claim_one_bus(bridge_dev->bus);
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if (hose->last_busno < child->number)
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hose->last_busno = child->number;
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dn->bussubno = child->number;
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/* ioremap() for child bus, which may or may not succeed */
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remap_bus_range(child);
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return 0;
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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_controller *hose = dn->phb;
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struct pci_dev *dev = NULL;
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/* Scan phb bus for EADS device, adding new one to bus->devices */
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if (!pci_scan_single_device(hose->bus, dn->devfn)) {
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printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
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return NULL;
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}
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/* Add new devices to global lists. Register in proc, sysfs. */
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pci_bus_add_devices(hose->bus);
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/* Confirm new bridge dev was created */
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dev = rpaphp_find_pci_dev(dn);
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if (!dev) {
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printk(KERN_ERR "%s: failed to add pci device\n", __FUNCTION__);
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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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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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if (pci_add_secondary_bus(dn, dev))
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return NULL;
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return dev;
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}
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static int dlpar_pci_remove_bus(struct pci_dev *bridge_dev)
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{
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struct pci_bus *secondary_bus;
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if (!bridge_dev) {
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printk(KERN_ERR "%s: unexpected null device\n",
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__FUNCTION__);
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return -EINVAL;
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}
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secondary_bus = bridge_dev->subordinate;
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if (unmap_bus_range(secondary_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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pci_remove_bus_device(bridge_dev);
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return 0;
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}
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static inline 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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/* 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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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(struct slot *slot)
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{
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struct pci_controller *phb;
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struct device_node *dn;
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int rc = 0;
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dn = slot->dn;
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if (!dn) {
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printk(KERN_ERR "%s: unexpected NULL slot device node\n",
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__FUNCTION__);
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return -EIO;
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}
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phb = dn->phb;
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if (!phb) {
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printk(KERN_ERR "%s: unexpected NULL phb pointer\n",
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__FUNCTION__);
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return -EIO;
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}
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if (rpaphp_remove_slot(slot)) {
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printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
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__FUNCTION__, slot->location);
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return -EIO;
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}
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rc = dlpar_remove_root_bus(phb);
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if (rc < 0)
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return rc;
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return 0;
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}
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static int dlpar_add_phb(struct device_node *dn)
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{
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struct pci_controller *phb;
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phb = init_phb_dynamic(dn);
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if (!phb)
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return -EINVAL;
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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 = 0;
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if (down_interruptible(&rpadlpar_sem))
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return -ERESTARTSYS;
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/* Check for existing hotplug slot */
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if (find_slot(drc_name)) {
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rc = -EINVAL;
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goto exit;
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}
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dn = find_newly_added_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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/* Just add hotplug slot */
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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(dn);
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break;
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default:
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printk("%s: unexpected node type\n", __FUNCTION__);
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return -EIO;
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}
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if (!rc && 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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rc = -EIO;
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}
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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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* -EIO Internal Error
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*/
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int dlpar_remove_vio_slot(struct slot *slot, char *drc_name)
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{
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/* Remove hotplug slot */
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if (rpaphp_remove_slot(slot)) {
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printk(KERN_ERR "%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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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(struct slot *slot, char *drc_name)
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{
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struct pci_dev *bridge_dev;
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bridge_dev = slot->bridge;
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if (!bridge_dev) {
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printk(KERN_ERR "%s: unexpected null bridge device\n",
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__FUNCTION__);
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return -EIO;
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}
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/* Remove hotplug slot */
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if (rpaphp_remove_slot(slot)) {
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printk(KERN_ERR "%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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/* Remove pci bus */
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if (dlpar_pci_remove_bus(bridge_dev)) {
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printk(KERN_ERR "%s: unable to remove pci bus %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_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 slot *slot;
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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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if (!find_php_slot_vio_node(drc_name) &&
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!find_php_slot_pci_node(drc_name, "SLOT") &&
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!find_php_slot_pci_node(drc_name, "PHB")) {
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rc = -ENODEV;
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goto exit;
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}
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slot = find_slot(drc_name);
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if (!slot) {
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rc = -EINVAL;
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goto exit;
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}
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if (slot->type == PHB) {
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rc = dlpar_remove_phb(slot);
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} else {
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switch (slot->dev_type) {
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case PCI_DEV:
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rc = dlpar_remove_pci_slot(slot, drc_name);
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break;
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case VIO_DEV:
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rc = dlpar_remove_vio_slot(slot, drc_name);
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break;
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}
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}
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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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