f5c99dfc11
Here's a small patch to reduce the nr. of pointer dereferences in drivers/pci/hotplug/rpaphp_pci.c Benefits: - micro speed optimization due to fewer pointer derefs - generated code should be slightly smaller - better readability note: due to lack of both hardware and cross-compile tools this patch is, unfortunately, completely untested. Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
470 lines
12 KiB
C
470 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 <linux/string.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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static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
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struct device_node *dn)
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{
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struct pci_bus *child = NULL;
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struct list_head *tmp;
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struct device_node *busdn;
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busdn = pci_bus_to_OF_node(bus);
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if (busdn == dn)
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return bus;
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list_for_each(tmp, &bus->children) {
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child = find_bus_among_children(pci_bus_b(tmp), dn);
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if (child)
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break;
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}
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return child;
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}
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struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn)
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{
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struct pci_dn *pdn = dn->data;
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if (!pdn || !pdn->phb || !pdn->phb->bus)
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return NULL;
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return find_bus_among_children(pdn->phb->bus, dn);
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}
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EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus);
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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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struct pci_bus *bus;
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int state, rc;
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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)
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*value = EMPTY;
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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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bus = rpaphp_find_pci_bus(slot->dn);
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if (bus && !list_empty(&bus->devices))
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*value = CONFIGURED;
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else
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*value = NOT_CONFIGURED;
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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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void 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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pci_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 void rpaphp_eeh_add_bus_device(struct pci_bus *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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eeh_add_device_late(dev);
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if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
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struct pci_bus *subbus = dev->subordinate;
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if (subbus)
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rpaphp_eeh_add_bus_device (subbus);
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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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void rpaphp_init_new_devs(struct pci_bus *bus)
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{
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rpaphp_fixup_new_pci_devices(bus, 0);
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rpaphp_eeh_add_bus_device(bus);
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}
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EXPORT_SYMBOL_GPL(rpaphp_init_new_devs);
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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 pci_bus *bus)
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{
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struct device_node *dn = pci_bus_to_OF_node(bus);
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struct pci_dev *dev = NULL;
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int slotno;
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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 (!dn || !dn->child)
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return NULL;
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if (_machine == PLATFORM_PSERIES_LPAR) {
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of_scan_bus(dn, bus);
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if (list_empty(&bus->devices)) {
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err("%s: No new device found\n", __FUNCTION__);
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return NULL;
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}
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rpaphp_init_new_devs(bus);
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pci_bus_add_devices(bus);
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dev = list_entry(&bus->devices, struct pci_dev, bus_list);
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} else {
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slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
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/* pci_scan_slot should find all children */
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num = pci_scan_slot(bus, PCI_DEVFN(slotno, 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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if (list_empty(&bus->devices)) {
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err("%s: No new device found\n", __FUNCTION__);
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return NULL;
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}
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list_for_each_entry(dev, &bus->devices, bus_list) {
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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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rpaphp_eeh_add_bus_device(bus);
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}
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}
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return dev;
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}
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static void print_slot_pci_funcs(struct pci_bus *bus)
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{
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struct device_node *dn;
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struct pci_dev *dev;
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dn = pci_bus_to_OF_node(bus);
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if (!dn)
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return;
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dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
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list_for_each_entry (dev, &bus->devices, 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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int rpaphp_config_pci_adapter(struct pci_bus *bus)
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{
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struct device_node *dn = pci_bus_to_OF_node(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__, dn->full_name);
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if (!dn)
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goto exit;
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eeh_add_device_tree_early(dn);
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dev = rpaphp_pci_config_slot(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(bus);
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rc = 0;
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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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EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);
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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 pci_bus *bus)
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{
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struct pci_dev *dev, *tmp;
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list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
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rpaphp_eeh_remove_bus_device(dev);
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pci_remove_bus_device(dev);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter);
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static int setup_pci_hotplug_slot_info(struct slot *slot)
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{
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struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info;
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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, &hotplug_slot_info->power_status);
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rpaphp_get_pci_adapter_status(slot, 1,
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&hotplug_slot_info->adapter_status);
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if (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 void set_slot_name(struct slot *slot)
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{
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struct pci_bus *bus = slot->bus;
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struct pci_dev *bridge;
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bridge = bus->self;
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if (bridge)
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strcpy(slot->name, pci_name(bridge));
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else
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sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
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bus->number);
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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 device_node *dn = slot->dn;
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struct pci_bus *bus;
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BUG_ON(!dn);
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bus = rpaphp_find_pci_bus(dn);
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if (!bus) {
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err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
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goto exit_rc;
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}
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slot->bus = bus;
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slot->pci_devs = &bus->devices;
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set_slot_name(slot);
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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 (!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->bus)) {
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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->bus);
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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 (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->bus);
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if (!retval) {
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slot->state = CONFIGURED;
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info("%s: devices in slot[%s] 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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