9c209c919d
The slot structure in the rpaphp module currently references the PCI contents of the slot using the PCI device of the parent bridge. This is unnecessary, since the module is actually interested in the subordinate bus of the bridge. The dependency on a PCI bridge device also prohibits the module from registering hotplug slots that have a root bridge as a parent, since root bridges on PPC64 don't have PCI devices. This patch changes struct slot to reference the PCI subsystem using a pci_bus rather than a pci_dev. Signed-off-by: John Rose <johnrose@austin.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
487 lines
12 KiB
C
487 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"
|
|
|
|
struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
|
|
{
|
|
struct pci_dev *dev = NULL;
|
|
char bus_id[BUS_ID_SIZE];
|
|
|
|
sprintf(bus_id, "%04x:%02x:%02x.%d", dn->phb->global_number,
|
|
dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn));
|
|
for_each_pci_dev(dev) {
|
|
if (!strcmp(pci_name(dev), bus_id)) {
|
|
break;
|
|
}
|
|
}
|
|
return dev;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn)
|
|
{
|
|
BUG_ON(!dn->phb || !dn->phb->bus);
|
|
|
|
return find_bus_among_children(dn->phb->bus, dn);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev);
|
|
|
|
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)
|
|
{
|
|
int state, rc;
|
|
struct device_node *child_dn;
|
|
struct pci_dev *child_dev = NULL;
|
|
|
|
*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 {
|
|
child_dn = slot->dn->child;
|
|
if (child_dn)
|
|
child_dev = rpaphp_find_pci_dev(child_dn);
|
|
|
|
if (child_dev)
|
|
*value = CONFIGURED;
|
|
else if (!child_dn)
|
|
dbg("%s: %s is not valid OFDT node\n",
|
|
__FUNCTION__, slot->dn->full_name);
|
|
else {
|
|
err("%s: can't find pdev of adapter in slot[%s]\n",
|
|
__FUNCTION__, slot->dn->full_name);
|
|
*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 device_node *dn, struct pci_bus *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->child) {
|
|
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);
|
|
}
|
|
dev = rpaphp_find_pci_dev(dn->child);
|
|
if (!dev) {
|
|
err("No new device found\n");
|
|
return NULL;
|
|
}
|
|
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 slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name);
|
|
list_for_each_entry (dev, slot->pci_devs, bus_list)
|
|
dbg("\t%s\n", pci_name(dev));
|
|
return;
|
|
}
|
|
|
|
static int rpaphp_config_pci_adapter(struct slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
int rc = -ENODEV;
|
|
|
|
dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
|
|
|
|
enable_eeh(slot->dn);
|
|
dev = rpaphp_pci_config_slot(slot->dn, slot->bus);
|
|
if (!dev) {
|
|
err("%s: can't find any devices.\n", __FUNCTION__);
|
|
goto exit;
|
|
}
|
|
print_slot_pci_funcs(slot);
|
|
rc = 0;
|
|
exit:
|
|
dbg("Exit %s: rc=%d\n", __FUNCTION__, rc);
|
|
return rc;
|
|
}
|
|
|
|
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)) {
|
|
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);
|
|
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);
|
|
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;
|
|
}
|