486 lines
10 KiB
C
486 lines
10 KiB
C
/*
|
|
* 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/module.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 slot *slot, *next;
|
|
|
|
list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
|
|
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(pdn);
|
|
|
|
/* 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 (pci_is_bridge(dev))
|
|
of_scan_pci_bridge(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 (pci_find_bus_by_node(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 (!pci_find_bus_by_node(dn))
|
|
return -EINVAL;
|
|
|
|
/* If pci slot is hotpluggable, 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)
|
|
{
|
|
struct vio_dev *vio_dev;
|
|
|
|
vio_dev = vio_find_node(dn);
|
|
if (vio_dev) {
|
|
put_device(&vio_dev->dev);
|
|
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 = 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:
|
|
mutex_unlock(&rpadlpar_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
|
|
* @drc_name: drc-name of newly added slot
|
|
* @dn: &device_node
|
|
*
|
|
* 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);
|
|
|
|
put_device(&vio_dev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
|
|
* @drc_name: drc-name of newly added slot
|
|
* @dn: &device_node
|
|
*
|
|
* 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;
|
|
int ret = 0;
|
|
|
|
pci_lock_rescan_remove();
|
|
|
|
bus = pci_find_bus_by_node(dn);
|
|
if (!bus) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
|
|
bus->self ? pci_name(bus->self) : "<!PHB!>");
|
|
|
|
slot = find_php_slot(dn);
|
|
if (slot) {
|
|
pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
|
|
pci_domain_nr(bus), bus->number);
|
|
|
|
if (rpaphp_deregister_slot(slot)) {
|
|
printk(KERN_ERR
|
|
"%s: unable to remove hotplug slot %s\n",
|
|
__func__, drc_name);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Remove all devices below slot */
|
|
pci_hp_remove_devices(bus);
|
|
|
|
/* Unmap PCI IO space */
|
|
if (pcibios_unmap_io_space(bus)) {
|
|
printk(KERN_ERR "%s: failed to unmap bus range\n",
|
|
__func__);
|
|
ret = -ERANGE;
|
|
goto out;
|
|
}
|
|
|
|
/* Remove the EADS bridge device itself */
|
|
BUG_ON(!bus->self);
|
|
pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
|
|
pci_stop_and_remove_bus_device(bus->self);
|
|
|
|
out:
|
|
pci_unlock_rescan_remove();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 (mutex_lock_interruptible(&rpadlpar_mutex))
|
|
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;
|
|
}
|
|
vm_unmap_aliases();
|
|
|
|
printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
|
|
exit:
|
|
mutex_unlock(&rpadlpar_mutex);
|
|
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",
|
|
__func__);
|
|
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");
|