bf5e2ba28f
The PCI code in 32 and 64 bits fixes up resources differently. 32 bits uses a header quirk plus handles bridges in pcibios_fixup_bus() while 64 bits does things in various places depending on whether you are using OF probing, using PCI hotplug, etc... This merges those by basically using the 32 bits approach for both, with various tweaks to make 64 bits work with the new approach. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
478 lines
10 KiB
C
478 lines
10 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/string.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 "../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 = NULL;
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char *name;
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int rc;
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if (!parent)
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return NULL;
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while ((dn = of_get_next_child(parent, dn))) {
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rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
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if ((rc == 0) && (!strcmp(drc_name, name)))
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break;
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}
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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 = NULL;
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char *name;
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char *type;
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int rc;
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while ((np = of_find_node_by_name(np, "pci"))) {
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rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
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if (rc == 0)
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if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
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break;
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}
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return np;
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}
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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 list_head *tmp, *n;
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struct slot *slot;
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list_for_each_safe(tmp, n, &rpaphp_slot_head) {
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slot = list_entry(tmp, struct slot, 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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eeh_add_device_tree_early(dn);
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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 %s\n",
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__FUNCTION__, dn->full_name);
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return;
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}
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
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dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
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of_scan_pci_bridge(dn, dev);
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pcibios_fixup_new_pci_devices(dev->subordinate);
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/* Claim new bus resources */
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pcibios_claim_one_bus(dev->bus);
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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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/* Add new devices to global lists. Register in proc, sysfs. */
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pci_bus_add_devices(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 (pcibios_find_pci_bus(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", __FUNCTION__,
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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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__FUNCTION__, 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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__FUNCTION__, 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_root_bus(struct pci_controller *phb)
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{
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struct pci_bus *phb_bus;
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int rc;
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phb_bus = phb->bus;
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if (!(list_empty(&phb_bus->children) &&
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list_empty(&phb_bus->devices))) {
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return -EBUSY;
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}
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rc = pcibios_remove_root_bus(phb);
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if (rc)
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return -EIO;
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device_unregister(phb_bus->bridge);
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pci_remove_bus(phb_bus);
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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 (!pcibios_find_pci_bus(dn))
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return -EINVAL;
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/* If pci slot is hotplugable, use hotplug to remove it */
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slot = find_php_slot(dn);
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if (slot) {
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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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__FUNCTION__, drc_name);
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return -EIO;
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}
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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 = dlpar_remove_root_bus(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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__FUNCTION__, 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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if (vio_find_node(dn))
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return -EINVAL;
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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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__FUNCTION__, 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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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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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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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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bus = pcibios_find_pci_bus(dn);
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if (!bus)
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return -EINVAL;
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/* If pci slot is hotplugable, use hotplug to remove it */
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slot = find_php_slot(dn);
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if (slot) {
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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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__FUNCTION__, drc_name);
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return -EIO;
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}
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} else
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pcibios_remove_pci_devices(bus);
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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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__FUNCTION__);
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return -ERANGE;
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}
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BUG_ON(!bus->self);
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pci_remove_bus_device(bus->self);
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return 0;
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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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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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int __init rpadlpar_io_init(void)
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{
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int rc = 0;
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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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__FUNCTION__);
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return -EPERM;
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}
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rc = dlpar_sysfs_init();
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return rc;
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}
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void rpadlpar_io_exit(void)
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{
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dlpar_sysfs_exit();
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return;
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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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