940903c5a5
This patch exports rpaphp_config_pci_adapter() for use by the rpadlpar module. It also changes this function by removing any dependencies on struct slot. The patch also changes the RPA DLPAR-add path to enable newly-added slots in a separate step from that which registers them as hotplug slots. Signed-off-by: John Rose <johnrose@austin.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
472 lines
12 KiB
C
472 lines
12 KiB
C
/*
|
|
* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
|
|
* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Send feedback to <lxie@us.ibm.com>
|
|
*
|
|
*/
|
|
#include <linux/pci.h>
|
|
#include <asm/pci-bridge.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/machdep.h>
|
|
#include "../pci.h" /* for pci_add_new_bus */
|
|
|
|
#include "rpaphp.h"
|
|
|
|
static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
|
|
struct device_node *dn)
|
|
{
|
|
struct pci_bus *child = NULL;
|
|
struct list_head *tmp;
|
|
struct device_node *busdn;
|
|
|
|
busdn = pci_bus_to_OF_node(bus);
|
|
if (busdn == dn)
|
|
return bus;
|
|
|
|
list_for_each(tmp, &bus->children) {
|
|
child = find_bus_among_children(pci_bus_b(tmp), dn);
|
|
if (child)
|
|
break;
|
|
}
|
|
return child;
|
|
}
|
|
|
|
static struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn)
|
|
{
|
|
if (!dn->phb || !dn->phb->bus)
|
|
return NULL;
|
|
|
|
return find_bus_among_children(dn->phb->bus, dn);
|
|
}
|
|
|
|
int rpaphp_claim_resource(struct pci_dev *dev, int resource)
|
|
{
|
|
struct resource *res = &dev->resource[resource];
|
|
struct resource *root = pci_find_parent_resource(dev, res);
|
|
char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
|
|
int err = -EINVAL;
|
|
|
|
if (root != NULL) {
|
|
err = request_resource(root, res);
|
|
}
|
|
|
|
if (err) {
|
|
err("PCI: %s region %d of %s %s [%lx:%lx]\n",
|
|
root ? "Address space collision on" :
|
|
"No parent found for",
|
|
resource, dtype, pci_name(dev), res->start, res->end);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
|
|
|
|
static int rpaphp_get_sensor_state(struct slot *slot, int *state)
|
|
{
|
|
int rc;
|
|
int setlevel;
|
|
|
|
rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
|
|
|
|
if (rc < 0) {
|
|
if (rc == -EFAULT || rc == -EEXIST) {
|
|
dbg("%s: slot must be power up to get sensor-state\n",
|
|
__FUNCTION__);
|
|
|
|
/* some slots have to be powered up
|
|
* before get-sensor will succeed.
|
|
*/
|
|
rc = rtas_set_power_level(slot->power_domain, POWER_ON,
|
|
&setlevel);
|
|
if (rc < 0) {
|
|
dbg("%s: power on slot[%s] failed rc=%d.\n",
|
|
__FUNCTION__, slot->name, rc);
|
|
} else {
|
|
rc = rtas_get_sensor(DR_ENTITY_SENSE,
|
|
slot->index, state);
|
|
}
|
|
} else if (rc == -ENODEV)
|
|
info("%s: slot is unusable\n", __FUNCTION__);
|
|
else
|
|
err("%s failed to get sensor state\n", __FUNCTION__);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* get_pci_adapter_status - get the status of a slot
|
|
*
|
|
* 0-- slot is empty
|
|
* 1-- adapter is configured
|
|
* 2-- adapter is not configured
|
|
* 3-- not valid
|
|
*/
|
|
int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
|
|
{
|
|
struct pci_bus *bus;
|
|
int state, rc;
|
|
|
|
*value = NOT_VALID;
|
|
rc = rpaphp_get_sensor_state(slot, &state);
|
|
if (rc)
|
|
goto exit;
|
|
|
|
if ((state == EMPTY) || (slot->type == PHB)) {
|
|
dbg("slot is empty\n");
|
|
*value = EMPTY;
|
|
}
|
|
else if (state == PRESENT) {
|
|
if (!is_init) {
|
|
/* at run-time slot->state can be changed by */
|
|
/* config/unconfig adapter */
|
|
*value = slot->state;
|
|
} else {
|
|
bus = rpaphp_find_pci_bus(slot->dn);
|
|
if (bus && !list_empty(&bus->devices))
|
|
*value = CONFIGURED;
|
|
else
|
|
*value = NOT_CONFIGURED;
|
|
}
|
|
}
|
|
exit:
|
|
return rc;
|
|
}
|
|
|
|
/* Must be called before pci_bus_add_devices */
|
|
static void
|
|
rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
/*
|
|
* Skip already-present devices (which are on the
|
|
* global device list.)
|
|
*/
|
|
if (list_empty(&dev->global_list)) {
|
|
int i;
|
|
|
|
/* Need to setup IOMMU tables */
|
|
ppc_md.iommu_dev_setup(dev);
|
|
|
|
if(fix_bus)
|
|
pcibios_fixup_device_resources(dev, bus);
|
|
pci_read_irq_line(dev);
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
|
|
struct resource *r = &dev->resource[i];
|
|
|
|
if (r->parent || !r->start || !r->flags)
|
|
continue;
|
|
rpaphp_claim_resource(dev, i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int rpaphp_pci_config_bridge(struct pci_dev *dev)
|
|
{
|
|
u8 sec_busno;
|
|
struct pci_bus *child_bus;
|
|
struct pci_dev *child_dev;
|
|
|
|
dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
|
|
|
|
/* get busno of downstream bus */
|
|
pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
|
|
|
|
/* add to children of PCI bridge dev->bus */
|
|
child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
|
|
if (!child_bus) {
|
|
err("%s: could not add second bus\n", __FUNCTION__);
|
|
return -EIO;
|
|
}
|
|
sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
|
|
/* do pci_scan_child_bus */
|
|
pci_scan_child_bus(child_bus);
|
|
|
|
list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
|
|
eeh_add_device_late(child_dev);
|
|
}
|
|
|
|
/* fixup new pci devices without touching bus struct */
|
|
rpaphp_fixup_new_pci_devices(child_bus, 0);
|
|
|
|
/* Make the discovered devices available */
|
|
pci_bus_add_devices(child_bus);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
rpaphp_pci_config_slot() will configure all devices under the
|
|
given slot->dn and return the the first pci_dev.
|
|
*****************************************************************************/
|
|
static struct pci_dev *
|
|
rpaphp_pci_config_slot(struct pci_bus *bus)
|
|
{
|
|
struct device_node *dn = pci_bus_to_OF_node(bus);
|
|
struct pci_dev *dev = NULL;
|
|
int slotno;
|
|
int num;
|
|
|
|
dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
|
|
if (!dn || !dn->child)
|
|
return NULL;
|
|
|
|
slotno = PCI_SLOT(dn->child->devfn);
|
|
|
|
/* pci_scan_slot should find all children */
|
|
num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
|
|
if (num) {
|
|
rpaphp_fixup_new_pci_devices(bus, 1);
|
|
pci_bus_add_devices(bus);
|
|
}
|
|
if (list_empty(&bus->devices)) {
|
|
err("%s: No new device found\n", __FUNCTION__);
|
|
return NULL;
|
|
}
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
|
|
rpaphp_pci_config_bridge(dev);
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
static void enable_eeh(struct device_node *dn)
|
|
{
|
|
struct device_node *sib;
|
|
|
|
for (sib = dn->child; sib; sib = sib->sibling)
|
|
enable_eeh(sib);
|
|
eeh_add_device_early(dn);
|
|
return;
|
|
|
|
}
|
|
|
|
static void print_slot_pci_funcs(struct pci_bus *bus)
|
|
{
|
|
struct device_node *dn;
|
|
struct pci_dev *dev;
|
|
|
|
dn = pci_bus_to_OF_node(bus);
|
|
if (!dn)
|
|
return;
|
|
|
|
dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
|
|
list_for_each_entry (dev, &bus->devices, bus_list)
|
|
dbg("\t%s\n", pci_name(dev));
|
|
return;
|
|
}
|
|
|
|
int rpaphp_config_pci_adapter(struct pci_bus *bus)
|
|
{
|
|
struct device_node *dn = pci_bus_to_OF_node(bus);
|
|
struct pci_dev *dev;
|
|
int rc = -ENODEV;
|
|
|
|
dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
|
|
if (!dn)
|
|
goto exit;
|
|
|
|
enable_eeh(dn);
|
|
dev = rpaphp_pci_config_slot(bus);
|
|
if (!dev) {
|
|
err("%s: can't find any devices.\n", __FUNCTION__);
|
|
goto exit;
|
|
}
|
|
print_slot_pci_funcs(bus);
|
|
rc = 0;
|
|
exit:
|
|
dbg("Exit %s: rc=%d\n", __FUNCTION__, rc);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);
|
|
|
|
static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
|
|
{
|
|
eeh_remove_device(dev);
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
|
|
struct pci_bus *bus = dev->subordinate;
|
|
struct list_head *ln;
|
|
if (!bus)
|
|
return;
|
|
for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
|
|
struct pci_dev *pdev = pci_dev_b(ln);
|
|
if (pdev)
|
|
rpaphp_eeh_remove_bus_device(pdev);
|
|
}
|
|
|
|
}
|
|
return;
|
|
}
|
|
|
|
int rpaphp_unconfig_pci_adapter(struct slot *slot)
|
|
{
|
|
struct pci_dev *dev, *tmp;
|
|
int retval = 0;
|
|
|
|
list_for_each_entry_safe(dev, tmp, slot->pci_devs, bus_list) {
|
|
rpaphp_eeh_remove_bus_device(dev);
|
|
pci_remove_bus_device(dev);
|
|
}
|
|
|
|
slot->state = NOT_CONFIGURED;
|
|
info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
|
|
slot->name);
|
|
return retval;
|
|
}
|
|
|
|
static int setup_pci_hotplug_slot_info(struct slot *slot)
|
|
{
|
|
dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
|
|
__FUNCTION__);
|
|
rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
|
|
rpaphp_get_pci_adapter_status(slot, 1,
|
|
&slot->hotplug_slot->info->
|
|
adapter_status);
|
|
if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
|
|
err("%s: NOT_VALID: skip dn->full_name=%s\n",
|
|
__FUNCTION__, slot->dn->full_name);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void set_slot_name(struct slot *slot)
|
|
{
|
|
struct pci_bus *bus = slot->bus;
|
|
struct pci_dev *bridge;
|
|
|
|
bridge = bus->self;
|
|
if (bridge)
|
|
strcpy(slot->name, pci_name(bridge));
|
|
else
|
|
sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
|
|
bus->number);
|
|
}
|
|
|
|
static int setup_pci_slot(struct slot *slot)
|
|
{
|
|
struct device_node *dn = slot->dn;
|
|
struct pci_bus *bus;
|
|
|
|
BUG_ON(!dn);
|
|
bus = rpaphp_find_pci_bus(dn);
|
|
if (!bus) {
|
|
err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
|
|
goto exit_rc;
|
|
}
|
|
|
|
slot->bus = bus;
|
|
slot->pci_devs = &bus->devices;
|
|
set_slot_name(slot);
|
|
|
|
/* find slot's pci_dev if it's not empty */
|
|
if (slot->hotplug_slot->info->adapter_status == EMPTY) {
|
|
slot->state = EMPTY; /* slot is empty */
|
|
} else {
|
|
/* slot is occupied */
|
|
if (!dn->child) {
|
|
/* non-empty slot has to have child */
|
|
err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
|
|
__FUNCTION__, slot->name);
|
|
goto exit_rc;
|
|
}
|
|
|
|
if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
|
|
dbg("%s CONFIGURING pci adapter in slot[%s]\n",
|
|
__FUNCTION__, slot->name);
|
|
if (rpaphp_config_pci_adapter(slot->bus)) {
|
|
err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
|
|
goto exit_rc;
|
|
}
|
|
|
|
} else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
|
|
err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
|
|
__FUNCTION__, slot->name);
|
|
goto exit_rc;
|
|
}
|
|
print_slot_pci_funcs(slot->bus);
|
|
if (!list_empty(slot->pci_devs)) {
|
|
slot->state = CONFIGURED;
|
|
} else {
|
|
/* DLPAR add as opposed to
|
|
* boot time */
|
|
slot->state = NOT_CONFIGURED;
|
|
}
|
|
}
|
|
return 0;
|
|
exit_rc:
|
|
dealloc_slot_struct(slot);
|
|
return -EINVAL;
|
|
}
|
|
|
|
int register_pci_slot(struct slot *slot)
|
|
{
|
|
int rc = -EINVAL;
|
|
|
|
if ((slot->type == EMBEDDED) || (slot->type == PHB))
|
|
slot->removable = 0;
|
|
else
|
|
slot->removable = 1;
|
|
if (setup_pci_hotplug_slot_info(slot))
|
|
goto exit_rc;
|
|
if (setup_pci_slot(slot))
|
|
goto exit_rc;
|
|
rc = register_slot(slot);
|
|
exit_rc:
|
|
return rc;
|
|
}
|
|
|
|
int rpaphp_enable_pci_slot(struct slot *slot)
|
|
{
|
|
int retval = 0, state;
|
|
|
|
retval = rpaphp_get_sensor_state(slot, &state);
|
|
if (retval)
|
|
goto exit;
|
|
dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
|
|
/* if slot is not empty, enable the adapter */
|
|
if (state == PRESENT) {
|
|
dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
|
|
retval = rpaphp_config_pci_adapter(slot->bus);
|
|
if (!retval) {
|
|
slot->state = CONFIGURED;
|
|
dbg("%s: PCI devices in slot[%s] has been configured\n",
|
|
__FUNCTION__, slot->name);
|
|
} else {
|
|
slot->state = NOT_CONFIGURED;
|
|
dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
|
|
__FUNCTION__, slot->name);
|
|
}
|
|
} else if (state == EMPTY) {
|
|
dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
|
|
slot->state = EMPTY;
|
|
} else {
|
|
err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
|
|
slot->name);
|
|
slot->state = NOT_VALID;
|
|
retval = -EINVAL;
|
|
}
|
|
exit:
|
|
dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
|
|
return retval;
|
|
}
|