/*
* 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.
*/
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/pci-bridge.h>
#include <asm/semaphore.h>
#include <asm/rtas.h>
#include <asm/vio.h>
#include "../pci.h"
#include "rpaphp.h"
#include "rpadlpar.h"
static DECLARE_MUTEX(rpadlpar_sem);
#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_type(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;
}
static struct slot *find_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 void rpadlpar_claim_one_bus(struct pci_bus *b)
{
struct list_head *ld;
struct pci_bus *child_bus;
for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
struct pci_dev *dev = pci_dev_b(ld);
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
if (r->parent || !r->start || !r->flags)
continue;
rpaphp_claim_resource(dev, i);
}
}
list_for_each_entry(child_bus, &b->children, node)
rpadlpar_claim_one_bus(child_bus);
}
static int pci_add_secondary_bus(struct device_node *dn,
struct pci_dev *bridge_dev)
{
struct pci_controller *hose = dn->phb;
struct pci_bus *child;
u8 sec_busno;
/* Get busno of downstream bus */
pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
/* Allocate and add to children of bridge_dev->bus */
child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
if (!child) {
printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
return -ENOMEM;
}
sprintf(child->name, "PCI Bus #%02x", child->number);
/* Fixup subordinate bridge bases and resources */
pcibios_fixup_bus(child);
/* Claim new bus resources */
rpadlpar_claim_one_bus(bridge_dev->bus);
if (hose->last_busno < child->number)
hose->last_busno = child->number;
dn->bussubno = child->number;
/* ioremap() for child bus, which may or may not succeed */
remap_bus_range(child);
return 0;
}
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 struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
{
struct pci_controller *hose = dn->phb;
struct pci_dev *dev = NULL;
/* Scan phb bus for EADS device, adding new one to bus->devices */
if (!pci_scan_single_device(hose->bus, dn->devfn)) {
printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
return NULL;
}
/* Add new devices to global lists. Register in proc, sysfs. */
pci_bus_add_devices(hose->bus);
/* Confirm new bridge dev was created */
dev = dlpar_find_new_dev(hose->bus, dn);
if (dev) {
if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
printk(KERN_ERR "%s: unexpected header type %d\n",
__FUNCTION__, dev->hdr_type);
return NULL;
}
if (pci_add_secondary_bus(dn, dev))
return NULL;
}
return dev;
}
static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
{
struct pci_dev *dev;
int rc;
if (rpaphp_find_pci_bus(dn))
return -EINVAL;
/* Add pci bus */
dev = dlpar_pci_add_bus(dn);
if (!dev) {
printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
drc_name);
return -EIO;
}
if (dn->child) {
rc = rpaphp_config_pci_adapter(dev->subordinate);
if (rc < 0) {
printk(KERN_ERR "%s: unable to enable slot %s\n",
__FUNCTION__, drc_name);
return -EIO;
}
}
/* Add hotplug slot */
if (rpaphp_add_slot(dn)) {
printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
__FUNCTION__, drc_name);
return -EIO;
}
return 0;
}
static int dlpar_remove_root_bus(struct pci_controller *phb)
{
struct pci_bus *phb_bus;
int rc;
phb_bus = phb->bus;
if (!(list_empty(&phb_bus->children) &&
list_empty(&phb_bus->devices))) {
return -EBUSY;
}
rc = pcibios_remove_root_bus(phb);
if (rc)
return -EIO;
device_unregister(phb_bus->bridge);
pci_remove_bus(phb_bus);
return 0;
}
static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
{
struct slot *slot;
int rc = 0;
if (!rpaphp_find_pci_bus(dn))
return -EINVAL;
slot = find_slot(dn);
if (slot) {
/* Remove hotplug slot */
if (rpaphp_remove_slot(slot)) {
printk(KERN_ERR
"%s: unable to remove hotplug slot %s\n",
__FUNCTION__, drc_name);
return -EIO;
}
}
BUG_ON(!dn->phb);
rc = dlpar_remove_root_bus(dn->phb);
if (rc < 0)
return rc;
dn->phb = NULL;
return 0;
}
static int dlpar_add_phb(char *drc_name, struct device_node *dn)
{
struct pci_controller *phb;
if (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",
__FUNCTION__, 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",
__FUNCTION__, 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 (down_interruptible(&rpadlpar_sem))
return -ERESTARTSYS;
/* Find newly added node */
dn = find_dlpar_node(drc_name, &node_type);
if (!dn) {
rc = -ENODEV;
goto exit;
}
switch (node_type) {
case NODE_TYPE_VIO:
rc = dlpar_add_vio_slot(drc_name, dn);
break;
case NODE_TYPE_SLOT:
rc = dlpar_add_pci_slot(drc_name, dn);
break;
case NODE_TYPE_PHB:
rc = dlpar_add_phb(drc_name, dn);
break;
}
printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
exit:
up(&rpadlpar_sem);
return rc;
}
/**
* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
* @drc_name: drc-name of newly added slot
*
* Remove the kernel and hotplug representations
* of an I/O Slot.
* Return Codes:
* 0 Success
* -EINVAL Vio dev doesn't exist
*/
static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
{
struct vio_dev *vio_dev;
vio_dev = vio_find_node(dn);
if (!vio_dev)
return -EINVAL;
vio_unregister_device(vio_dev);
return 0;
}
/**
* dlpar_remove_slot - DLPAR remove a PCI I/O Slot
* @drc_name: drc-name of newly added slot
*
* Remove the kernel and hotplug representations
* of a PCI I/O Slot.
* Return Codes:
* 0 Success
* -ENODEV Not a valid drc_name
* -EIO Internal PCI Error
*/
int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
{
struct pci_bus *bus;
struct slot *slot;
bus = rpaphp_find_pci_bus(dn);
if (!bus)
return -EINVAL;
slot = find_slot(dn);
if (slot) {
/* Remove hotplug slot */
if (rpaphp_remove_slot(slot)) {
printk(KERN_ERR
"%s: unable to remove hotplug slot %s\n",
__FUNCTION__, drc_name);
return -EIO;
}
}
if (unmap_bus_range(bus)) {
printk(KERN_ERR "%s: failed to unmap bus range\n",
__FUNCTION__);
return -ERANGE;
}
BUG_ON(!bus->self);
pci_remove_bus_device(bus->self);
return 0;
}
/**
* dlpar_remove_slot - DLPAR remove an I/O Slot
* @drc_name: drc-name of newly added slot
*
* Remove the kernel and hotplug representations
* of an I/O Slot.
* Return Codes:
* 0 Success
* -ENODEV Not a valid drc_name
* -EINVAL Slot already removed
* -ERESTARTSYS Signalled before obtaining lock
* -EIO Internal Error
*/
int dlpar_remove_slot(char *drc_name)
{
struct device_node *dn;
int node_type;
int rc = 0;
if (down_interruptible(&rpadlpar_sem))
return -ERESTARTSYS;
dn = find_dlpar_node(drc_name, &node_type);
if (!dn) {
rc = -ENODEV;
goto exit;
}
switch (node_type) {
case NODE_TYPE_VIO:
rc = dlpar_remove_vio_slot(drc_name, dn);
break;
case NODE_TYPE_PHB:
rc = dlpar_remove_phb(drc_name, dn);
break;
case NODE_TYPE_SLOT:
rc = dlpar_remove_pci_slot(drc_name, dn);
break;
}
printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
exit:
up(&rpadlpar_sem);
return rc;
}
static inline int is_dlpar_capable(void)
{
int rc = rtas_token("ibm,configure-connector");
return (int) (rc != RTAS_UNKNOWN_SERVICE);
}
int __init rpadlpar_io_init(void)
{
int rc = 0;
if (!is_dlpar_capable()) {
printk(KERN_WARNING "%s: partition not DLPAR capable\n",
__FUNCTION__);
return -EPERM;
}
rc = dlpar_sysfs_init();
return rc;
}
void rpadlpar_io_exit(void)
{
dlpar_sysfs_exit();
return;
}
module_init(rpadlpar_io_init);
module_exit(rpadlpar_io_exit);
MODULE_LICENSE("GPL");
