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