// SPDX-License-Identifier: GPL-2.0+
/*
* Interface for Dynamic Logical Partitioning of I/O Slots on
* RPA-compliant PPC64 platform.
*
* John Rose <[email protected]>
* Linda Xie <[email protected]>
*
* October 2003
*
* Copyright (C) 2003 IBM.
*/
#undef DEBUG
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.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 <linux/firmware.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;
int rc;
if (!parent)
return NULL;
for_each_child_of_node(parent, dn) {
rc = rpaphp_check_drc_props(dn, drc_name, NULL);
if (rc == 0)
break;
}
of_node_put(parent);
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;
int rc;
for_each_node_by_name(np, "pci") {
rc = rpaphp_check_drc_props(np, drc_name, drc_type);
if (rc == 0)
break;
}
return np;
}
/* Returns a device_node with its reference count incremented */
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;
pseries_eeh_init_edev_recursive(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 %pOF\n",
__func__, dn);
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;
}
of_node_put(dn);
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
*/
static 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;
}
of_node_put(dn);
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);
}
static int __init rpadlpar_io_init(void)
{
if (!is_dlpar_capable()) {
printk(KERN_WARNING "%s: partition not DLPAR capable\n",
__func__);
return -EPERM;
}
return dlpar_sysfs_init();
}
static void __exit rpadlpar_io_exit(void)
{
dlpar_sysfs_exit();
}
module_init(rpadlpar_io_init);
module_exit(rpadlpar_io_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("RPA Dynamic Logical Partitioning driver for I/O slots");
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