483 lines
10 KiB
C
483 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Interface for Dynamic Logical Partitioning of I/O Slots on
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* RPA-compliant PPC64 platform.
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*
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* John Rose <johnrose@austin.ibm.com>
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* Linda Xie <lxie@us.ibm.com>
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*
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* October 2003
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*
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* Copyright (C) 2003 IBM.
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*/
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#undef DEBUG
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include <asm/pci-bridge.h>
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#include <linux/mutex.h>
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#include <asm/rtas.h>
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#include <asm/vio.h>
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#include <linux/firmware.h>
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#include "../pci.h"
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#include "rpaphp.h"
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#include "rpadlpar.h"
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static DEFINE_MUTEX(rpadlpar_mutex);
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#define DLPAR_MODULE_NAME "rpadlpar_io"
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#define NODE_TYPE_VIO 1
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#define NODE_TYPE_SLOT 2
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#define NODE_TYPE_PHB 3
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static struct device_node *find_vio_slot_node(char *drc_name)
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{
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struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
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struct device_node *dn;
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int rc;
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if (!parent)
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return NULL;
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for_each_child_of_node(parent, dn) {
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rc = rpaphp_check_drc_props(dn, drc_name, NULL);
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if (rc == 0)
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break;
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}
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of_node_put(parent);
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return dn;
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}
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/* Find dlpar-capable pci node that contains the specified name and type */
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static struct device_node *find_php_slot_pci_node(char *drc_name,
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char *drc_type)
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{
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struct device_node *np;
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int rc;
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for_each_node_by_name(np, "pci") {
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rc = rpaphp_check_drc_props(np, drc_name, drc_type);
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if (rc == 0)
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break;
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}
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return np;
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}
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/* Returns a device_node with its reference count incremented */
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static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
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{
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struct device_node *dn;
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dn = find_php_slot_pci_node(drc_name, "SLOT");
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if (dn) {
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*node_type = NODE_TYPE_SLOT;
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return dn;
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}
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dn = find_php_slot_pci_node(drc_name, "PHB");
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if (dn) {
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*node_type = NODE_TYPE_PHB;
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return dn;
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}
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dn = find_vio_slot_node(drc_name);
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if (dn) {
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*node_type = NODE_TYPE_VIO;
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return dn;
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}
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return NULL;
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}
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/**
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* find_php_slot - return hotplug slot structure for device node
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* @dn: target &device_node
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*
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* This routine will return the hotplug slot structure
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* for a given device node. Note that built-in PCI slots
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* may be dlpar-able, but not hot-pluggable, so this routine
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* will return NULL for built-in PCI slots.
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*/
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static struct slot *find_php_slot(struct device_node *dn)
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{
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struct slot *slot, *next;
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list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
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rpaphp_slot_list) {
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if (slot->dn == dn)
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return slot;
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}
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return NULL;
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}
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static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
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struct device_node *dev_dn)
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{
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struct pci_dev *tmp = NULL;
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struct device_node *child_dn;
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list_for_each_entry(tmp, &parent->devices, bus_list) {
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child_dn = pci_device_to_OF_node(tmp);
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if (child_dn == dev_dn)
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return tmp;
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}
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return NULL;
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}
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static void dlpar_pci_add_bus(struct device_node *dn)
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{
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struct pci_dn *pdn = PCI_DN(dn);
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struct pci_controller *phb = pdn->phb;
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struct pci_dev *dev = NULL;
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pseries_eeh_init_edev_recursive(pdn);
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/* Add EADS device to PHB bus, adding new entry to bus->devices */
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dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
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if (!dev) {
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printk(KERN_ERR "%s: failed to create pci dev for %pOF\n",
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__func__, dn);
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return;
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}
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/* Scan below the new bridge */
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if (pci_is_bridge(dev))
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of_scan_pci_bridge(dev);
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/* Map IO space for child bus, which may or may not succeed */
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pcibios_map_io_space(dev->subordinate);
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/* Finish adding it : resource allocation, adding devices, etc...
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* Note that we need to perform the finish pass on the -parent-
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* bus of the EADS bridge so the bridge device itself gets
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* properly added
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*/
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pcibios_finish_adding_to_bus(phb->bus);
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}
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static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
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{
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struct pci_dev *dev;
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struct pci_controller *phb;
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if (pci_find_bus_by_node(dn))
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return -EINVAL;
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/* Add pci bus */
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dlpar_pci_add_bus(dn);
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/* Confirm new bridge dev was created */
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phb = PCI_DN(dn)->phb;
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dev = dlpar_find_new_dev(phb->bus, dn);
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if (!dev) {
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printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
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drc_name);
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return -EIO;
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}
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if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
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printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
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__func__, dev->hdr_type, drc_name);
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return -EIO;
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}
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/* Add hotplug slot */
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if (rpaphp_add_slot(dn)) {
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printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
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__func__, drc_name);
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return -EIO;
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}
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return 0;
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}
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static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
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{
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struct slot *slot;
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struct pci_dn *pdn;
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int rc = 0;
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if (!pci_find_bus_by_node(dn))
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return -EINVAL;
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/* If pci slot is hotpluggable, use hotplug to remove it */
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slot = find_php_slot(dn);
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if (slot && rpaphp_deregister_slot(slot)) {
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printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
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__func__, drc_name);
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return -EIO;
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}
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pdn = dn->data;
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BUG_ON(!pdn || !pdn->phb);
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rc = remove_phb_dynamic(pdn->phb);
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if (rc < 0)
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return rc;
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pdn->phb = NULL;
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return 0;
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}
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static int dlpar_add_phb(char *drc_name, struct device_node *dn)
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{
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struct pci_controller *phb;
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if (PCI_DN(dn) && PCI_DN(dn)->phb) {
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/* PHB already exists */
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return -EINVAL;
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}
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phb = init_phb_dynamic(dn);
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if (!phb)
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return -EIO;
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if (rpaphp_add_slot(dn)) {
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printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
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__func__, drc_name);
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return -EIO;
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}
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return 0;
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}
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static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
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{
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struct vio_dev *vio_dev;
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vio_dev = vio_find_node(dn);
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if (vio_dev) {
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put_device(&vio_dev->dev);
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return -EINVAL;
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}
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if (!vio_register_device_node(dn)) {
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printk(KERN_ERR
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"%s: failed to register vio node %s\n",
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__func__, drc_name);
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return -EIO;
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}
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return 0;
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}
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/**
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* dlpar_add_slot - DLPAR add an I/O Slot
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* @drc_name: drc-name of newly added slot
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*
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* Make the hotplug module and the kernel aware of a newly added I/O Slot.
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* Return Codes:
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* 0 Success
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* -ENODEV Not a valid drc_name
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* -EINVAL Slot already added
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* -ERESTARTSYS Signalled before obtaining lock
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* -EIO Internal PCI Error
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*/
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int dlpar_add_slot(char *drc_name)
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{
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struct device_node *dn = NULL;
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int node_type;
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int rc = -EIO;
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if (mutex_lock_interruptible(&rpadlpar_mutex))
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return -ERESTARTSYS;
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/* Find newly added node */
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dn = find_dlpar_node(drc_name, &node_type);
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if (!dn) {
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rc = -ENODEV;
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goto exit;
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}
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switch (node_type) {
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case NODE_TYPE_VIO:
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rc = dlpar_add_vio_slot(drc_name, dn);
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break;
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case NODE_TYPE_SLOT:
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rc = dlpar_add_pci_slot(drc_name, dn);
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break;
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case NODE_TYPE_PHB:
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rc = dlpar_add_phb(drc_name, dn);
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break;
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}
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of_node_put(dn);
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printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
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exit:
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mutex_unlock(&rpadlpar_mutex);
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return rc;
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}
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/**
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* dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
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* @drc_name: drc-name of newly added slot
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* @dn: &device_node
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*
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* Remove the kernel and hotplug representations of an I/O Slot.
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* Return Codes:
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* 0 Success
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* -EINVAL Vio dev doesn't exist
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*/
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static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
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{
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struct vio_dev *vio_dev;
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vio_dev = vio_find_node(dn);
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if (!vio_dev)
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return -EINVAL;
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vio_unregister_device(vio_dev);
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put_device(&vio_dev->dev);
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return 0;
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}
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/**
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* dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
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* @drc_name: drc-name of newly added slot
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* @dn: &device_node
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*
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* Remove the kernel and hotplug representations of a PCI I/O Slot.
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* Return Codes:
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* 0 Success
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* -ENODEV Not a valid drc_name
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* -EIO Internal PCI Error
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*/
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static int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
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{
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struct pci_bus *bus;
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struct slot *slot;
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int ret = 0;
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pci_lock_rescan_remove();
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bus = pci_find_bus_by_node(dn);
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if (!bus) {
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ret = -EINVAL;
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goto out;
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}
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pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
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bus->self ? pci_name(bus->self) : "<!PHB!>");
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slot = find_php_slot(dn);
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if (slot) {
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pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
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pci_domain_nr(bus), bus->number);
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if (rpaphp_deregister_slot(slot)) {
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printk(KERN_ERR
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"%s: unable to remove hotplug slot %s\n",
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__func__, drc_name);
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ret = -EIO;
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goto out;
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}
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}
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/* Remove all devices below slot */
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pci_hp_remove_devices(bus);
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/* Unmap PCI IO space */
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if (pcibios_unmap_io_space(bus)) {
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printk(KERN_ERR "%s: failed to unmap bus range\n",
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__func__);
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ret = -ERANGE;
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goto out;
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}
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/* Remove the EADS bridge device itself */
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BUG_ON(!bus->self);
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pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
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pci_stop_and_remove_bus_device(bus->self);
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out:
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pci_unlock_rescan_remove();
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return ret;
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}
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/**
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* dlpar_remove_slot - DLPAR remove an I/O Slot
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* @drc_name: drc-name of newly added slot
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*
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* Remove the kernel and hotplug representations of an I/O Slot.
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* Return Codes:
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* 0 Success
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* -ENODEV Not a valid drc_name
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* -EINVAL Slot already removed
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* -ERESTARTSYS Signalled before obtaining lock
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* -EIO Internal Error
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*/
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int dlpar_remove_slot(char *drc_name)
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{
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struct device_node *dn;
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int node_type;
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int rc = 0;
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if (mutex_lock_interruptible(&rpadlpar_mutex))
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return -ERESTARTSYS;
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dn = find_dlpar_node(drc_name, &node_type);
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if (!dn) {
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rc = -ENODEV;
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goto exit;
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}
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switch (node_type) {
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case NODE_TYPE_VIO:
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rc = dlpar_remove_vio_slot(drc_name, dn);
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break;
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case NODE_TYPE_PHB:
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rc = dlpar_remove_phb(drc_name, dn);
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break;
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case NODE_TYPE_SLOT:
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rc = dlpar_remove_pci_slot(drc_name, dn);
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break;
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}
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of_node_put(dn);
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vm_unmap_aliases();
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printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
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exit:
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mutex_unlock(&rpadlpar_mutex);
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return rc;
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}
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static inline int is_dlpar_capable(void)
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{
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int rc = rtas_token("ibm,configure-connector");
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return (int) (rc != RTAS_UNKNOWN_SERVICE);
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}
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static int __init rpadlpar_io_init(void)
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{
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if (!is_dlpar_capable()) {
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printk(KERN_WARNING "%s: partition not DLPAR capable\n",
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__func__);
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return -EPERM;
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}
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return dlpar_sysfs_init();
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}
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static void __exit rpadlpar_io_exit(void)
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{
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dlpar_sysfs_exit();
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}
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module_init(rpadlpar_io_init);
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module_exit(rpadlpar_io_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("RPA Dynamic Logical Partitioning driver for I/O slots");
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