5eeb8c63a3
Currently, rpaphp registers Virtual I/O slots as hotplug slots. The only purpose of this registration is to ensure that the VIO subsystem is notified of new VIO buses during DLPAR adds. Similarly, rpaphp notifies the VIO subsystem when a VIO bus is DLPAR-removed. The rpaphp module has special case code to fake results for attributes like power, adapter status, etc. The VIO register/unregister functions could just as easily be made from the DLPAR module. This patch moves the VIO registration calls to the DLPAR module, and removes the VIO fluff from rpaphp altogether. Signed-off-by: John Rose <johnrose@austin.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
500 lines
12 KiB
C
500 lines
12 KiB
C
/*
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* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
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* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <lxie@us.ibm.com>
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*
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*/
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#include <linux/pci.h>
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#include <asm/pci-bridge.h>
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#include <asm/rtas.h>
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#include <asm/machdep.h>
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#include "../pci.h" /* for pci_add_new_bus */
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#include "rpaphp.h"
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struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
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{
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struct pci_dev *dev = NULL;
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char bus_id[BUS_ID_SIZE];
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sprintf(bus_id, "%04x:%02x:%02x.%d", dn->phb->global_number,
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dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn));
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for_each_pci_dev(dev) {
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if (!strcmp(pci_name(dev), bus_id)) {
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break;
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}
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}
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return dev;
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}
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EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev);
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int rpaphp_claim_resource(struct pci_dev *dev, int resource)
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{
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struct resource *res = &dev->resource[resource];
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struct resource *root = pci_find_parent_resource(dev, res);
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char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
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int err = -EINVAL;
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if (root != NULL) {
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err = request_resource(root, res);
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}
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if (err) {
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err("PCI: %s region %d of %s %s [%lx:%lx]\n",
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root ? "Address space collision on" :
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"No parent found for",
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resource, dtype, pci_name(dev), res->start, res->end);
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
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static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot)
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{
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return rpaphp_find_pci_dev(slot->dn);
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}
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static int rpaphp_get_sensor_state(struct slot *slot, int *state)
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{
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int rc;
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int setlevel;
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rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
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if (rc < 0) {
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if (rc == -EFAULT || rc == -EEXIST) {
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dbg("%s: slot must be power up to get sensor-state\n",
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__FUNCTION__);
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/* some slots have to be powered up
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* before get-sensor will succeed.
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*/
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rc = rtas_set_power_level(slot->power_domain, POWER_ON,
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&setlevel);
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if (rc < 0) {
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dbg("%s: power on slot[%s] failed rc=%d.\n",
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__FUNCTION__, slot->name, rc);
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} else {
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rc = rtas_get_sensor(DR_ENTITY_SENSE,
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slot->index, state);
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}
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} else if (rc == -ENODEV)
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info("%s: slot is unusable\n", __FUNCTION__);
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else
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err("%s failed to get sensor state\n", __FUNCTION__);
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}
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return rc;
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}
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/**
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* get_pci_adapter_status - get the status of a slot
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*
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* 0-- slot is empty
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* 1-- adapter is configured
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* 2-- adapter is not configured
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* 3-- not valid
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*/
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int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
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{
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int state, rc;
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struct device_node *child_dn;
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struct pci_dev *child_dev = NULL;
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*value = NOT_VALID;
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rc = rpaphp_get_sensor_state(slot, &state);
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if (rc)
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goto exit;
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if ((state == EMPTY) || (slot->type == PHB)) {
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dbg("slot is empty\n");
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*value = EMPTY;
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}
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else if (state == PRESENT) {
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if (!is_init) {
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/* at run-time slot->state can be changed by */
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/* config/unconfig adapter */
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*value = slot->state;
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} else {
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child_dn = slot->dn->child;
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if (child_dn)
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child_dev = rpaphp_find_pci_dev(child_dn);
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if (child_dev)
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*value = CONFIGURED;
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else if (!child_dn)
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dbg("%s: %s is not valid OFDT node\n",
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__FUNCTION__, slot->dn->full_name);
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else {
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err("%s: can't find pdev of adapter in slot[%s]\n",
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__FUNCTION__, slot->dn->full_name);
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*value = NOT_CONFIGURED;
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}
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}
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}
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exit:
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return rc;
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}
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/* Must be called before pci_bus_add_devices */
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static void
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rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
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{
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struct pci_dev *dev;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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/*
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* Skip already-present devices (which are on the
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* global device list.)
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*/
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if (list_empty(&dev->global_list)) {
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int i;
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/* Need to setup IOMMU tables */
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ppc_md.iommu_dev_setup(dev);
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if(fix_bus)
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pcibios_fixup_device_resources(dev, bus);
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pci_read_irq_line(dev);
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *r = &dev->resource[i];
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if (r->parent || !r->start || !r->flags)
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continue;
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rpaphp_claim_resource(dev, i);
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}
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}
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}
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}
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static int rpaphp_pci_config_bridge(struct pci_dev *dev)
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{
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u8 sec_busno;
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struct pci_bus *child_bus;
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struct pci_dev *child_dev;
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dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
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/* get busno of downstream bus */
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pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
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/* add to children of PCI bridge dev->bus */
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child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
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if (!child_bus) {
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err("%s: could not add second bus\n", __FUNCTION__);
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return -EIO;
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}
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sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
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/* do pci_scan_child_bus */
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pci_scan_child_bus(child_bus);
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list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
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eeh_add_device_late(child_dev);
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}
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/* fixup new pci devices without touching bus struct */
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rpaphp_fixup_new_pci_devices(child_bus, 0);
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/* Make the discovered devices available */
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pci_bus_add_devices(child_bus);
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return 0;
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}
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/*****************************************************************************
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rpaphp_pci_config_slot() will configure all devices under the
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given slot->dn and return the the first pci_dev.
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*****************************************************************************/
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static struct pci_dev *
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rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
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{
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struct device_node *eads_first_child = dn->child;
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struct pci_dev *dev = NULL;
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int num;
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dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
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if (eads_first_child) {
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/* pci_scan_slot should find all children of EADs */
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num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
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if (num) {
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rpaphp_fixup_new_pci_devices(bus, 1);
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pci_bus_add_devices(bus);
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}
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dev = rpaphp_find_pci_dev(eads_first_child);
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if (!dev) {
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err("No new device found\n");
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return NULL;
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}
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
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rpaphp_pci_config_bridge(dev);
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}
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return dev;
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}
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static void enable_eeh(struct device_node *dn)
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{
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struct device_node *sib;
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for (sib = dn->child; sib; sib = sib->sibling)
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enable_eeh(sib);
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eeh_add_device_early(dn);
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return;
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}
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static void print_slot_pci_funcs(struct slot *slot)
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{
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struct pci_dev *dev;
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dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name);
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list_for_each_entry (dev, slot->pci_devs, bus_list)
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dbg("\t%s\n", pci_name(dev));
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return;
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}
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static int rpaphp_config_pci_adapter(struct slot *slot)
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{
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struct pci_bus *pci_bus;
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struct pci_dev *dev;
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int rc = -ENODEV;
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dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
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if (slot->bridge) {
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pci_bus = slot->bridge->subordinate;
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if (!pci_bus) {
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err("%s: can't find bus structure\n", __FUNCTION__);
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goto exit;
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}
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enable_eeh(slot->dn);
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dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
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if (!dev) {
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err("%s: can't find any devices.\n", __FUNCTION__);
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goto exit;
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}
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print_slot_pci_funcs(slot);
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rc = 0;
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} else {
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/* slot is not enabled */
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err("slot doesn't have pci_dev structure\n");
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}
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exit:
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dbg("Exit %s: rc=%d\n", __FUNCTION__, rc);
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return rc;
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}
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static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
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{
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eeh_remove_device(dev);
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
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struct pci_bus *bus = dev->subordinate;
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struct list_head *ln;
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if (!bus)
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return;
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for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
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struct pci_dev *pdev = pci_dev_b(ln);
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if (pdev)
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rpaphp_eeh_remove_bus_device(pdev);
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}
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}
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return;
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}
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int rpaphp_unconfig_pci_adapter(struct slot *slot)
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{
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struct pci_dev *dev;
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int retval = 0;
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list_for_each_entry(dev, slot->pci_devs, bus_list)
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rpaphp_eeh_remove_bus_device(dev);
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pci_remove_behind_bridge(slot->bridge);
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slot->state = NOT_CONFIGURED;
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info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
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slot->name);
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return retval;
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}
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static int setup_pci_hotplug_slot_info(struct slot *slot)
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{
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dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
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__FUNCTION__);
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rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
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rpaphp_get_pci_adapter_status(slot, 1,
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&slot->hotplug_slot->info->
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adapter_status);
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if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
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err("%s: NOT_VALID: skip dn->full_name=%s\n",
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__FUNCTION__, slot->dn->full_name);
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return -EINVAL;
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}
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return 0;
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}
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static int set_phb_slot_name(struct slot *slot)
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{
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struct device_node *dn;
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struct pci_controller *phb;
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struct pci_bus *bus;
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dn = slot->dn;
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if (!dn) {
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return -EINVAL;
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}
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phb = dn->phb;
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if (!phb) {
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return -EINVAL;
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}
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bus = phb->bus;
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if (!bus) {
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return -EINVAL;
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}
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sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
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bus->number, 0, 0);
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return 0;
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}
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static int setup_pci_slot(struct slot *slot)
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{
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struct pci_bus *bus;
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int rc;
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if (slot->type == PHB) {
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rc = set_phb_slot_name(slot);
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if (rc < 0) {
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err("%s: failed to set phb slot name\n", __FUNCTION__);
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goto exit_rc;
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}
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} else {
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slot->bridge = rpaphp_find_bridge_pdev(slot);
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if (!slot->bridge) {
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/* slot being added doesn't have pci_dev yet */
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err("%s: no pci_dev for bridge dn %s\n",
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__FUNCTION__, slot->name);
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goto exit_rc;
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}
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bus = slot->bridge->subordinate;
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if (!bus)
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goto exit_rc;
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slot->pci_devs = &bus->devices;
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dbg("%s set slot->name to %s\n", __FUNCTION__,
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pci_name(slot->bridge));
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strcpy(slot->name, pci_name(slot->bridge));
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}
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/* find slot's pci_dev if it's not empty */
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if (slot->hotplug_slot->info->adapter_status == EMPTY) {
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slot->state = EMPTY; /* slot is empty */
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} else {
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/* slot is occupied */
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if (!(slot->dn->child)) {
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/* non-empty slot has to have child */
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err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
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__FUNCTION__, slot->name);
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goto exit_rc;
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}
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if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
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dbg("%s CONFIGURING pci adapter in slot[%s]\n",
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__FUNCTION__, slot->name);
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if (rpaphp_config_pci_adapter(slot)) {
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err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
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goto exit_rc;
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}
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} else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
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err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
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__FUNCTION__, slot->name);
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goto exit_rc;
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}
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print_slot_pci_funcs(slot);
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if (!list_empty(slot->pci_devs)) {
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slot->state = CONFIGURED;
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} else {
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/* DLPAR add as opposed to
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* boot time */
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slot->state = NOT_CONFIGURED;
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}
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}
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return 0;
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exit_rc:
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dealloc_slot_struct(slot);
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return -EINVAL;
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}
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int register_pci_slot(struct slot *slot)
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{
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int rc = -EINVAL;
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if ((slot->type == EMBEDDED) || (slot->type == PHB))
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slot->removable = 0;
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else
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slot->removable = 1;
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if (setup_pci_hotplug_slot_info(slot))
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goto exit_rc;
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if (setup_pci_slot(slot))
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goto exit_rc;
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rc = register_slot(slot);
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exit_rc:
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return rc;
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}
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int rpaphp_enable_pci_slot(struct slot *slot)
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{
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int retval = 0, state;
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retval = rpaphp_get_sensor_state(slot, &state);
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if (retval)
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goto exit;
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dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
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/* if slot is not empty, enable the adapter */
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if (state == PRESENT) {
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dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
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retval = rpaphp_config_pci_adapter(slot);
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if (!retval) {
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slot->state = CONFIGURED;
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dbg("%s: PCI devices in slot[%s] has been configured\n",
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__FUNCTION__, slot->name);
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} else {
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slot->state = NOT_CONFIGURED;
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dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
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__FUNCTION__, slot->name);
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}
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} else if (state == EMPTY) {
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dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
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slot->state = EMPTY;
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} else {
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err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
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slot->name);
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slot->state = NOT_VALID;
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retval = -EINVAL;
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}
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exit:
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dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
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return retval;
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}
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