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linux/drivers/pci/hotplug/rpadlpar_core.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

504 lines
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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.
*/
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/pci-bridge.h>
#include <asm/semaphore.h>
#include <asm/rtas.h>
#include "../pci.h"
#include "rpaphp.h"
#include "rpadlpar.h"
static DECLARE_MUTEX(rpadlpar_sem);
#define NODE_TYPE_VIO 1
#define NODE_TYPE_SLOT 2
#define NODE_TYPE_PHB 3
static struct device_node *find_php_slot_vio_node(char *drc_name)
{
struct device_node *child;
struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
char *loc_code;
if (!parent)
return NULL;
for (child = of_get_next_child(parent, NULL);
child; child = of_get_next_child(parent, child)) {
loc_code = get_property(child, "ibm,loc-code", NULL);
if (loc_code && !strncmp(loc_code, drc_name, strlen(drc_name)))
return child;
}
return NULL;
}
/* 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_newly_added_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_php_slot_vio_node(drc_name);
if (dn) {
*node_type = NODE_TYPE_VIO;
return dn;
}
return NULL;
}
static struct slot *find_slot(char *drc_name)
{
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 (strcmp(slot->location, drc_name) == 0)
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_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 = rpaphp_find_pci_dev(dn);
if (!dev) {
printk(KERN_ERR "%s: failed to add pci device\n", __FUNCTION__);
return NULL;
}
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_pci_remove_bus(struct pci_dev *bridge_dev)
{
struct pci_bus *secondary_bus;
if (!bridge_dev) {
printk(KERN_ERR "%s: unexpected null device\n",
__FUNCTION__);
return -EINVAL;
}
secondary_bus = bridge_dev->subordinate;
if (unmap_bus_range(secondary_bus)) {
printk(KERN_ERR "%s: failed to unmap bus range\n",
__FUNCTION__);
return -ERANGE;
}
pci_remove_bus_device(bridge_dev);
return 0;
}
static inline int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
{
struct pci_dev *dev;
/* 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;
}
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(struct slot *slot)
{
struct pci_controller *phb;
struct device_node *dn;
int rc = 0;
dn = slot->dn;
if (!dn) {
printk(KERN_ERR "%s: unexpected NULL slot device node\n",
__FUNCTION__);
return -EIO;
}
phb = dn->phb;
if (!phb) {
printk(KERN_ERR "%s: unexpected NULL phb pointer\n",
__FUNCTION__);
return -EIO;
}
if (rpaphp_remove_slot(slot)) {
printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
__FUNCTION__, slot->location);
return -EIO;
}
rc = dlpar_remove_root_bus(phb);
if (rc < 0)
return rc;
return 0;
}
static int dlpar_add_phb(struct device_node *dn)
{
struct pci_controller *phb;
phb = init_phb_dynamic(dn);
if (!phb)
return -EINVAL;
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 = 0;
if (down_interruptible(&rpadlpar_sem))
return -ERESTARTSYS;
/* Check for existing hotplug slot */
if (find_slot(drc_name)) {
rc = -EINVAL;
goto exit;
}
dn = find_newly_added_node(drc_name, &node_type);
if (!dn) {
rc = -ENODEV;
goto exit;
}
switch (node_type) {
case NODE_TYPE_VIO:
/* Just add hotplug slot */
break;
case NODE_TYPE_SLOT:
rc = dlpar_add_pci_slot(drc_name, dn);
break;
case NODE_TYPE_PHB:
rc = dlpar_add_phb(dn);
break;
default:
printk("%s: unexpected node type\n", __FUNCTION__);
return -EIO;
}
if (!rc && rpaphp_add_slot(dn)) {
printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
__FUNCTION__, drc_name);
rc = -EIO;
}
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
* -EIO Internal Error
*/
int dlpar_remove_vio_slot(struct slot *slot, char *drc_name)
{
/* Remove hotplug slot */
if (rpaphp_remove_slot(slot)) {
printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
__FUNCTION__, drc_name);
return -EIO;
}
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(struct slot *slot, char *drc_name)
{
struct pci_dev *bridge_dev;
bridge_dev = slot->bridge;
if (!bridge_dev) {
printk(KERN_ERR "%s: unexpected null bridge device\n",
__FUNCTION__);
return -EIO;
}
/* Remove hotplug slot */
if (rpaphp_remove_slot(slot)) {
printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
__FUNCTION__, drc_name);
return -EIO;
}
/* Remove pci bus */
if (dlpar_pci_remove_bus(bridge_dev)) {
printk(KERN_ERR "%s: unable to remove pci bus %s\n",
__FUNCTION__, drc_name);
return -EIO;
}
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 slot *slot;
int rc = 0;
if (down_interruptible(&rpadlpar_sem))
return -ERESTARTSYS;
if (!find_php_slot_vio_node(drc_name) &&
!find_php_slot_pci_node(drc_name, "SLOT") &&
!find_php_slot_pci_node(drc_name, "PHB")) {
rc = -ENODEV;
goto exit;
}
slot = find_slot(drc_name);
if (!slot) {
rc = -EINVAL;
goto exit;
}
if (slot->type == PHB) {
rc = dlpar_remove_phb(slot);
} else {
switch (slot->dev_type) {
case PCI_DEV:
rc = dlpar_remove_pci_slot(slot, drc_name);
break;
case VIO_DEV:
rc = dlpar_remove_vio_slot(slot, drc_name);
break;
}
}
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");
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