linux/drivers/pci/hotplug/acpiphp_glue.c

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/*
* ACPI PCI HotPlug glue functions to ACPI CA subsystem
*
* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
* Copyright (C) 2002,2003 NEC Corporation
* Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
* Copyright (C) 2003-2005 Hewlett Packard
* Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
* Copyright (C) 2005 Intel Corporation
*
* 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 <kristen.c.accardi@intel.com>
*
*/
/*
* Lifetime rules for pci_dev:
* - The one in acpiphp_func has its refcount elevated by pci_get_slot()
* when the driver is loaded or when an insertion event occurs. It loses
* a refcount when its ejected or the driver unloads.
* - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
* when the bridge is scanned and it loses a refcount when the bridge
* is removed.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/pci-acpi.h>
#include <linux/mutex.h>
#include "../pci.h"
#include "acpiphp.h"
static LIST_HEAD(bridge_list);
static LIST_HEAD(ioapic_list);
static DEFINE_SPINLOCK(ioapic_list_lock);
#define MY_NAME "acpiphp_glue"
static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
/* callback routine to check for the existence of a pci dock device */
static acpi_status
is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
if (is_dock_device(handle)) {
(*count)++;
return AE_CTRL_TERMINATE;
} else {
return AE_OK;
}
}
/*
* the _DCK method can do funny things... and sometimes not
* hah-hah funny.
*
* TBD - figure out a way to only call fixups for
* systems that require them.
*/
static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
void *v)
{
struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
struct pci_bus *bus = func->slot->bridge->pci_bus;
u32 buses;
if (!bus->self)
return NOTIFY_OK;
/* fixup bad _DCK function that rewrites
* secondary bridge on slot
*/
pci_read_config_dword(bus->self,
PCI_PRIMARY_BUS,
&buses);
if (((buses >> 8) & 0xff) != bus->secondary) {
buses = (buses & 0xff000000)
| ((unsigned int)(bus->primary) << 0)
| ((unsigned int)(bus->secondary) << 8)
| ((unsigned int)(bus->subordinate) << 16);
pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
}
return NOTIFY_OK;
}
static struct acpi_dock_ops acpiphp_dock_ops = {
.handler = handle_hotplug_event_func,
};
/* callback routine to register each ACPI PCI slot object */
static acpi_status
register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
{
struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
struct acpiphp_slot *slot;
struct acpiphp_func *newfunc;
acpi_handle tmp;
acpi_status status = AE_OK;
unsigned long long adr, sun;
int device, function, retval;
struct pci_bus *pbus = bridge->pci_bus;
if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
return AE_OK;
acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
device = (adr >> 16) & 0xffff;
function = adr & 0xffff;
newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
if (!newfunc)
return AE_NO_MEMORY;
INIT_LIST_HEAD(&newfunc->sibling);
newfunc->handle = handle;
newfunc->function = function;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
newfunc->flags = FUNC_HAS_EJ0;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
newfunc->flags |= FUNC_HAS_STA;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
newfunc->flags |= FUNC_HAS_PS0;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
newfunc->flags |= FUNC_HAS_PS3;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
newfunc->flags |= FUNC_HAS_DCK;
status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
if (ACPI_FAILURE(status)) {
/*
* use the count of the number of slots we've found
* for the number of the slot
*/
sun = bridge->nr_slots+1;
}
/* search for objects that share the same slot */
for (slot = bridge->slots; slot; slot = slot->next)
if (slot->device == device) {
if (slot->sun != sun)
warn("sibling found, but _SUN doesn't match!\n");
break;
}
if (!slot) {
slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
if (!slot) {
kfree(newfunc);
return AE_NO_MEMORY;
}
slot->bridge = bridge;
slot->device = device;
slot->sun = sun;
INIT_LIST_HEAD(&slot->funcs);
mutex_init(&slot->crit_sect);
slot->next = bridge->slots;
bridge->slots = slot;
bridge->nr_slots++;
dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
slot->sun, pci_domain_nr(pbus), pbus->number, device);
retval = acpiphp_register_hotplug_slot(slot);
if (retval) {
PCI: introduce pci_slot Currently, /sys/bus/pci/slots/ only exposes hotplug attributes when a hotplug driver is loaded, but PCI slots have attributes such as address, speed, width, etc. that are not related to hotplug at all. Introduce pci_slot as the primary data structure and kobject model. Hotplug attributes described in hotplug_slot become a secondary structure associated with the pci_slot. This patch only creates the infrastructure that allows the separation of PCI slot attributes and hotplug attributes. In this patch, the PCI hotplug core remains the only user of this infrastructure, and thus, /sys/bus/pci/slots/ will still only become populated when a hotplug driver is loaded. A later patch in this series will add a second user of this new infrastructure and demonstrate splitting the task of exposing pci_slot attributes from hotplug_slot attributes. - Make pci_slot the primary sysfs entity. hotplug_slot becomes a subsidiary structure. o pci_create_slot() creates and registers a slot with the PCI core o pci_slot_add_hotplug() gives it hotplug capability - Change the prototype of pci_hp_register() to take the bus and slot number (on parent bus) as parameters. - Remove all the ->get_address methods since this functionality is now handled by pci_slot directly. [achiang@hp.com: rpaphp-correctly-pci_hp_register-for-empty-pci-slots] Tested-by: Badari Pulavarty <pbadari@us.ibm.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: make headers_check happy] [akpm@linux-foundation.org: nuther build fix] [akpm@linux-foundation.org: fix typo in #include] Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Matthew Wilcox <matthew@wil.cx> Cc: Greg KH <greg@kroah.com> Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Cc: Len Brown <lenb@kernel.org> Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-06-10 21:28:50 +00:00
if (retval == -EBUSY)
warn("Slot %llu already registered by another "
PCI: introduce pci_slot Currently, /sys/bus/pci/slots/ only exposes hotplug attributes when a hotplug driver is loaded, but PCI slots have attributes such as address, speed, width, etc. that are not related to hotplug at all. Introduce pci_slot as the primary data structure and kobject model. Hotplug attributes described in hotplug_slot become a secondary structure associated with the pci_slot. This patch only creates the infrastructure that allows the separation of PCI slot attributes and hotplug attributes. In this patch, the PCI hotplug core remains the only user of this infrastructure, and thus, /sys/bus/pci/slots/ will still only become populated when a hotplug driver is loaded. A later patch in this series will add a second user of this new infrastructure and demonstrate splitting the task of exposing pci_slot attributes from hotplug_slot attributes. - Make pci_slot the primary sysfs entity. hotplug_slot becomes a subsidiary structure. o pci_create_slot() creates and registers a slot with the PCI core o pci_slot_add_hotplug() gives it hotplug capability - Change the prototype of pci_hp_register() to take the bus and slot number (on parent bus) as parameters. - Remove all the ->get_address methods since this functionality is now handled by pci_slot directly. [achiang@hp.com: rpaphp-correctly-pci_hp_register-for-empty-pci-slots] Tested-by: Badari Pulavarty <pbadari@us.ibm.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: make headers_check happy] [akpm@linux-foundation.org: nuther build fix] [akpm@linux-foundation.org: fix typo in #include] Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Matthew Wilcox <matthew@wil.cx> Cc: Greg KH <greg@kroah.com> Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Cc: Len Brown <lenb@kernel.org> Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-06-10 21:28:50 +00:00
"hotplug driver\n", slot->sun);
else
warn("acpiphp_register_hotplug_slot failed "
"(err code = 0x%x)\n", retval);
goto err_exit;
}
}
newfunc->slot = slot;
list_add_tail(&newfunc->sibling, &slot->funcs);
/* associate corresponding pci_dev */
newfunc->pci_dev = pci_get_slot(pbus, PCI_DEVFN(device, function));
if (newfunc->pci_dev) {
slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
}
if (is_dock_device(handle)) {
/* we don't want to call this device's _EJ0
* because we want the dock notify handler
* to call it after it calls _DCK
*/
newfunc->flags &= ~FUNC_HAS_EJ0;
if (register_hotplug_dock_device(handle,
&acpiphp_dock_ops, newfunc))
dbg("failed to register dock device\n");
/* we need to be notified when dock events happen
* outside of the hotplug operation, since we may
* need to do fixups before we can hotplug.
*/
newfunc->nb.notifier_call = post_dock_fixups;
if (register_dock_notifier(&newfunc->nb))
dbg("failed to register a dock notifier");
}
/* install notify handler */
if (!(newfunc->flags & FUNC_HAS_DCK)) {
status = acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func,
newfunc);
if (ACPI_FAILURE(status))
err("failed to register interrupt notify handler\n");
} else
status = AE_OK;
return status;
err_exit:
bridge->nr_slots--;
bridge->slots = slot->next;
kfree(slot);
kfree(newfunc);
return AE_OK;
}
/* see if it's worth looking at this bridge */
static int detect_ejectable_slots(struct pci_bus *pbus)
{
int found = acpi_pci_detect_ejectable(pbus);
if (!found) {
acpi_handle bridge_handle = acpi_pci_get_bridge_handle(pbus);
if (!bridge_handle)
return 0;
acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
is_pci_dock_device, (void *)&found, NULL);
}
return found;
}
/* decode ACPI 2.0 _HPP hot plug parameters */
static void decode_hpp(struct acpiphp_bridge *bridge)
{
acpi_status status;
status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
if (ACPI_FAILURE(status) ||
!bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
/* use default numbers */
printk(KERN_WARNING
"%s: Could not get hotplug parameters. Use defaults\n",
__func__);
bridge->hpp.t0 = &bridge->hpp.type0_data;
bridge->hpp.t0->revision = 0;
bridge->hpp.t0->cache_line_size = 0x10;
bridge->hpp.t0->latency_timer = 0x40;
bridge->hpp.t0->enable_serr = 0;
bridge->hpp.t0->enable_perr = 0;
}
}
/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
static void init_bridge_misc(struct acpiphp_bridge *bridge)
{
acpi_status status;
/* decode ACPI 2.0 _HPP (hot plug parameters) */
decode_hpp(bridge);
/* must be added to the list prior to calling register_slot */
list_add(&bridge->list, &bridge_list);
/* register all slot objects under this bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
register_slot, bridge, NULL);
if (ACPI_FAILURE(status)) {
list_del(&bridge->list);
return;
}
/* install notify handler */
if (bridge->type != BRIDGE_TYPE_HOST) {
if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
status = acpi_remove_notify_handler(bridge->func->handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
}
status = acpi_install_notify_handler(bridge->handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge,
bridge);
if (ACPI_FAILURE(status)) {
err("failed to register interrupt notify handler\n");
}
}
}
/* find acpiphp_func from acpiphp_bridge */
static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
{
struct list_head *node, *l;
struct acpiphp_bridge *bridge;
struct acpiphp_slot *slot;
struct acpiphp_func *func;
list_for_each(node, &bridge_list) {
bridge = list_entry(node, struct acpiphp_bridge, list);
for (slot = bridge->slots; slot; slot = slot->next) {
list_for_each(l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func,
sibling);
if (func->handle == handle)
return func;
}
}
}
return NULL;
}
static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
{
acpi_handle dummy_handle;
if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
"_STA", &dummy_handle)))
bridge->flags |= BRIDGE_HAS_STA;
if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
"_EJ0", &dummy_handle)))
bridge->flags |= BRIDGE_HAS_EJ0;
if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
"_PS0", &dummy_handle)))
bridge->flags |= BRIDGE_HAS_PS0;
if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
"_PS3", &dummy_handle)))
bridge->flags |= BRIDGE_HAS_PS3;
/* is this ejectable p2p bridge? */
if (bridge->flags & BRIDGE_HAS_EJ0) {
struct acpiphp_func *func;
dbg("found ejectable p2p bridge\n");
/* make link between PCI bridge and PCI function */
func = acpiphp_bridge_handle_to_function(bridge->handle);
if (!func)
return;
bridge->func = func;
func->bridge = bridge;
}
}
/* allocate and initialize host bridge data structure */
static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
{
struct acpiphp_bridge *bridge;
bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
if (bridge == NULL)
return;
bridge->type = BRIDGE_TYPE_HOST;
bridge->handle = handle;
bridge->pci_bus = pci_bus;
spin_lock_init(&bridge->res_lock);
init_bridge_misc(bridge);
}
/* allocate and initialize PCI-to-PCI bridge data structure */
static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
{
struct acpiphp_bridge *bridge;
bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
if (bridge == NULL) {
err("out of memory\n");
return;
}
bridge->type = BRIDGE_TYPE_P2P;
bridge->handle = handle;
config_p2p_bridge_flags(bridge);
bridge->pci_dev = pci_dev_get(pci_dev);
bridge->pci_bus = pci_dev->subordinate;
if (!bridge->pci_bus) {
err("This is not a PCI-to-PCI bridge!\n");
goto err;
}
spin_lock_init(&bridge->res_lock);
init_bridge_misc(bridge);
return;
err:
pci_dev_put(pci_dev);
kfree(bridge);
return;
}
/* callback routine to find P2P bridges */
static acpi_status
find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
acpi_status status;
acpi_handle dummy_handle;
unsigned long long tmp;
int device, function;
struct pci_dev *dev;
struct pci_bus *pci_bus = context;
status = acpi_get_handle(handle, "_ADR", &dummy_handle);
if (ACPI_FAILURE(status))
return AE_OK; /* continue */
status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
if (ACPI_FAILURE(status)) {
dbg("%s: _ADR evaluation failure\n", __func__);
return AE_OK;
}
device = (tmp >> 16) & 0xffff;
function = tmp & 0xffff;
dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
if (!dev || !dev->subordinate)
goto out;
/* check if this bridge has ejectable slots */
if ((detect_ejectable_slots(dev->subordinate) > 0)) {
dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
add_p2p_bridge(handle, dev);
}
/* search P2P bridges under this p2p bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
find_p2p_bridge, dev->subordinate, NULL);
if (ACPI_FAILURE(status))
warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
out:
pci_dev_put(dev);
return AE_OK;
}
/* find hot-pluggable slots, and then find P2P bridge */
static int add_bridge(acpi_handle handle)
{
acpi_status status;
unsigned long long tmp;
int seg, bus;
acpi_handle dummy_handle;
struct pci_bus *pci_bus;
/* if the bridge doesn't have _STA, we assume it is always there */
status = acpi_get_handle(handle, "_STA", &dummy_handle);
if (ACPI_SUCCESS(status)) {
status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
if (ACPI_FAILURE(status)) {
dbg("%s: _STA evaluation failure\n", __func__);
return 0;
}
if ((tmp & ACPI_STA_FUNCTIONING) == 0)
/* don't register this object */
return 0;
}
/* get PCI segment number */
status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
seg = ACPI_SUCCESS(status) ? tmp : 0;
/* get PCI bus number */
status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
if (ACPI_SUCCESS(status)) {
bus = tmp;
} else {
warn("can't get bus number, assuming 0\n");
bus = 0;
}
pci_bus = pci_find_bus(seg, bus);
if (!pci_bus) {
err("Can't find bus %04x:%02x\n", seg, bus);
return 0;
}
/* check if this bridge has ejectable slots */
if (detect_ejectable_slots(pci_bus) > 0) {
dbg("found PCI host-bus bridge with hot-pluggable slots\n");
add_host_bridge(handle, pci_bus);
}
/* search P2P bridges under this host bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
find_p2p_bridge, pci_bus, NULL);
if (ACPI_FAILURE(status))
warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
return 0;
}
static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
{
struct list_head *head;
list_for_each(head, &bridge_list) {
struct acpiphp_bridge *bridge = list_entry(head,
struct acpiphp_bridge, list);
if (bridge->handle == handle)
return bridge;
}
return NULL;
}
static void cleanup_bridge(struct acpiphp_bridge *bridge)
{
struct list_head *list, *tmp;
struct acpiphp_slot *slot;
acpi_status status;
acpi_handle handle = bridge->handle;
status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
if ((bridge->type != BRIDGE_TYPE_HOST) &&
((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
status = acpi_install_notify_handler(bridge->func->handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func,
bridge->func);
if (ACPI_FAILURE(status))
err("failed to install interrupt notify handler\n");
}
slot = bridge->slots;
while (slot) {
struct acpiphp_slot *next = slot->next;
list_for_each_safe (list, tmp, &slot->funcs) {
struct acpiphp_func *func;
func = list_entry(list, struct acpiphp_func, sibling);
if (is_dock_device(func->handle)) {
unregister_hotplug_dock_device(func->handle);
unregister_dock_notifier(&func->nb);
}
if (!(func->flags & FUNC_HAS_DCK)) {
status = acpi_remove_notify_handler(func->handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
}
pci_dev_put(func->pci_dev);
list_del(list);
kfree(func);
}
acpiphp_unregister_hotplug_slot(slot);
list_del(&slot->funcs);
kfree(slot);
slot = next;
}
pci_dev_put(bridge->pci_dev);
list_del(&bridge->list);
kfree(bridge);
}
static acpi_status
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
struct acpiphp_bridge *bridge;
/* cleanup p2p bridges under this P2P bridge
in a depth-first manner */
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
cleanup_p2p_bridge, NULL, NULL);
bridge = acpiphp_handle_to_bridge(handle);
if (bridge)
cleanup_bridge(bridge);
return AE_OK;
}
static void remove_bridge(acpi_handle handle)
{
struct acpiphp_bridge *bridge;
/* cleanup p2p bridges under this host bridge
in a depth-first manner */
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
(u32)1, cleanup_p2p_bridge, NULL, NULL);
/*
* On root bridges with hotplug slots directly underneath (ie,
* no p2p bridge inbetween), we call cleanup_bridge().
*
* The else clause cleans up root bridges that either had no
* hotplug slots at all, or had a p2p bridge underneath.
*/
bridge = acpiphp_handle_to_bridge(handle);
if (bridge)
cleanup_bridge(bridge);
else
acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge);
}
static struct pci_dev * get_apic_pci_info(acpi_handle handle)
{
struct acpi_pci_id id;
struct pci_bus *bus;
struct pci_dev *dev;
if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
return NULL;
bus = pci_find_bus(id.segment, id.bus);
if (!bus)
return NULL;
dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
if (!dev)
return NULL;
if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
(dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
{
pci_dev_put(dev);
return NULL;
}
return dev;
}
static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
{
acpi_status status;
int result = -1;
unsigned long long gsb;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *obj;
void *table;
status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
if (ACPI_SUCCESS(status)) {
*gsi_base = (u32)gsb;
return 0;
}
status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
return -1;
obj = buffer.pointer;
if (obj->type != ACPI_TYPE_BUFFER)
goto out;
table = obj->buffer.pointer;
switch (((struct acpi_subtable_header *)table)->type) {
case ACPI_MADT_TYPE_IO_SAPIC:
*gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
result = 0;
break;
case ACPI_MADT_TYPE_IO_APIC:
*gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
result = 0;
break;
default:
break;
}
out:
kfree(buffer.pointer);
return result;
}
static acpi_status
ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
{
acpi_status status;
unsigned long long sta;
acpi_handle tmp;
struct pci_dev *pdev;
u32 gsi_base;
u64 phys_addr;
struct acpiphp_ioapic *ioapic;
/* Evaluate _STA if present */
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
return AE_CTRL_DEPTH;
/* Scan only PCI bus scope */
status = acpi_get_handle(handle, "_HID", &tmp);
if (ACPI_SUCCESS(status))
return AE_CTRL_DEPTH;
if (get_gsi_base(handle, &gsi_base))
return AE_OK;
ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
if (!ioapic)
return AE_NO_MEMORY;
pdev = get_apic_pci_info(handle);
if (!pdev)
goto exit_kfree;
if (pci_enable_device(pdev))
goto exit_pci_dev_put;
pci_set_master(pdev);
if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
goto exit_pci_disable_device;
phys_addr = pci_resource_start(pdev, 0);
if (acpi_register_ioapic(handle, phys_addr, gsi_base))
goto exit_pci_release_region;
ioapic->gsi_base = gsi_base;
ioapic->dev = pdev;
spin_lock(&ioapic_list_lock);
list_add_tail(&ioapic->list, &ioapic_list);
spin_unlock(&ioapic_list_lock);
return AE_OK;
exit_pci_release_region:
pci_release_region(pdev, 0);
exit_pci_disable_device:
pci_disable_device(pdev);
exit_pci_dev_put:
pci_dev_put(pdev);
exit_kfree:
kfree(ioapic);
return AE_OK;
}
static acpi_status
ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
{
acpi_status status;
unsigned long long sta;
acpi_handle tmp;
u32 gsi_base;
struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
/* Evaluate _STA if present */
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
return AE_CTRL_DEPTH;
/* Scan only PCI bus scope */
status = acpi_get_handle(handle, "_HID", &tmp);
if (ACPI_SUCCESS(status))
return AE_CTRL_DEPTH;
if (get_gsi_base(handle, &gsi_base))
return AE_OK;
acpi_unregister_ioapic(handle, gsi_base);
spin_lock(&ioapic_list_lock);
list_for_each_entry_safe(pos, n, &ioapic_list, list) {
if (pos->gsi_base != gsi_base)
continue;
ioapic = pos;
list_del(&ioapic->list);
break;
}
spin_unlock(&ioapic_list_lock);
if (!ioapic)
return AE_OK;
pci_release_region(ioapic->dev, 0);
pci_disable_device(ioapic->dev);
pci_dev_put(ioapic->dev);
kfree(ioapic);
return AE_OK;
}
static int acpiphp_configure_ioapics(acpi_handle handle)
{
ioapic_add(handle, 0, NULL, NULL);
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
return 0;
}
static int acpiphp_unconfigure_ioapics(acpi_handle handle)
{
ioapic_remove(handle, 0, NULL, NULL);
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
return 0;
}
static int power_on_slot(struct acpiphp_slot *slot)
{
acpi_status status;
struct acpiphp_func *func;
struct list_head *l;
int retval = 0;
/* if already enabled, just skip */
if (slot->flags & SLOT_POWEREDON)
goto err_exit;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (func->flags & FUNC_HAS_PS0) {
dbg("%s: executing _PS0\n", __func__);
status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
if (ACPI_FAILURE(status)) {
warn("%s: _PS0 failed\n", __func__);
retval = -1;
goto err_exit;
} else
break;
}
}
/* TBD: evaluate _STA to check if the slot is enabled */
slot->flags |= SLOT_POWEREDON;
err_exit:
return retval;
}
static int power_off_slot(struct acpiphp_slot *slot)
{
acpi_status status;
struct acpiphp_func *func;
struct list_head *l;
int retval = 0;
/* if already disabled, just skip */
if ((slot->flags & SLOT_POWEREDON) == 0)
goto err_exit;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (func->flags & FUNC_HAS_PS3) {
status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
if (ACPI_FAILURE(status)) {
warn("%s: _PS3 failed\n", __func__);
retval = -1;
goto err_exit;
} else
break;
}
}
/* TBD: evaluate _STA to check if the slot is disabled */
slot->flags &= (~SLOT_POWEREDON);
err_exit:
return retval;
}
/**
* acpiphp_max_busnr - return the highest reserved bus number under the given bus.
* @bus: bus to start search with
*/
static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
{
struct list_head *tmp;
unsigned char max, n;
/*
* pci_bus_max_busnr will return the highest
* reserved busnr for all these children.
* that is equivalent to the bus->subordinate
* value. We don't want to use the parent's
* bus->subordinate value because it could have
* padding in it.
*/
max = bus->secondary;
list_for_each(tmp, &bus->children) {
n = pci_bus_max_busnr(pci_bus_b(tmp));
if (n > max)
max = n;
}
return max;
}
/**
* acpiphp_bus_add - add a new bus to acpi subsystem
* @func: acpiphp_func of the bridge
*/
static int acpiphp_bus_add(struct acpiphp_func *func)
{
acpi_handle phandle;
struct acpi_device *device, *pdevice;
int ret_val;
acpi_get_parent(func->handle, &phandle);
if (acpi_bus_get_device(phandle, &pdevice)) {
dbg("no parent device, assuming NULL\n");
pdevice = NULL;
}
if (!acpi_bus_get_device(func->handle, &device)) {
dbg("bus exists... trim\n");
/* this shouldn't be in here, so remove
* the bus then re-add it...
*/
ret_val = acpi_bus_trim(device, 1);
dbg("acpi_bus_trim return %x\n", ret_val);
}
ret_val = acpi_bus_add(&device, pdevice, func->handle,
ACPI_BUS_TYPE_DEVICE);
if (ret_val) {
dbg("error adding bus, %x\n",
-ret_val);
goto acpiphp_bus_add_out;
}
/*
* try to start anyway. We could have failed to add
* simply because this bus had previously been added
* on another add. Don't bother with the return value
* we just keep going.
*/
ret_val = acpi_bus_start(device);
acpiphp_bus_add_out:
return ret_val;
}
/**
* acpiphp_bus_trim - trim a bus from acpi subsystem
* @handle: handle to acpi namespace
*/
static int acpiphp_bus_trim(acpi_handle handle)
{
struct acpi_device *device;
int retval;
retval = acpi_bus_get_device(handle, &device);
if (retval) {
dbg("acpi_device not found\n");
return retval;
}
retval = acpi_bus_trim(device, 1);
if (retval)
err("cannot remove from acpi list\n");
return retval;
}
/**
* enable_device - enable, configure a slot
* @slot: slot to be enabled
*
* This function should be called per *physical slot*,
* not per each slot object in ACPI namespace.
*/
static int __ref enable_device(struct acpiphp_slot *slot)
{
struct pci_dev *dev;
struct pci_bus *bus = slot->bridge->pci_bus;
struct list_head *l;
struct acpiphp_func *func;
int retval = 0;
int num, max, pass;
acpi_status status;
if (slot->flags & SLOT_ENABLED)
goto err_exit;
/* sanity check: dev should be NULL when hot-plugged in */
dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
if (dev) {
/* This case shouldn't happen */
err("pci_dev structure already exists.\n");
pci_dev_put(dev);
retval = -1;
goto err_exit;
}
num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
if (num == 0) {
err("No new device found\n");
retval = -1;
goto err_exit;
}
max = acpiphp_max_busnr(bus);
for (pass = 0; pass < 2; pass++) {
list_for_each_entry(dev, &bus->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != slot->device)
continue;
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
max = pci_scan_bridge(bus, dev, max, pass);
if (pass && dev->subordinate)
pci_bus_size_bridges(dev->subordinate);
}
}
}
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
acpiphp_bus_add(func);
}
pci_bus_assign_resources(bus);
acpiphp_sanitize_bus(bus);
acpiphp_set_hpp_values(slot->bridge->handle, bus);
list_for_each_entry(func, &slot->funcs, sibling)
acpiphp_configure_ioapics(func->handle);
pci_enable_bridges(bus);
pci_bus_add_devices(bus);
/* associate pci_dev to our representation */
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
func->function));
if (!func->pci_dev)
continue;
if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
continue;
status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
if (ACPI_FAILURE(status))
warn("find_p2p_bridge failed (error code = 0x%x)\n",
status);
}
slot->flags |= SLOT_ENABLED;
err_exit:
return retval;
}
static void disable_bridges(struct pci_bus *bus)
{
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->subordinate) {
disable_bridges(dev->subordinate);
pci_disable_device(dev);
}
}
}
/**
* disable_device - disable a slot
* @slot: ACPI PHP slot
*/
static int disable_device(struct acpiphp_slot *slot)
{
int retval = 0;
struct acpiphp_func *func;
struct list_head *l;
/* is this slot already disabled? */
if (!(slot->flags & SLOT_ENABLED))
goto err_exit;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (func->bridge) {
/* cleanup p2p bridges under this P2P bridge */
cleanup_p2p_bridge(func->bridge->handle,
(u32)1, NULL, NULL);
func->bridge = NULL;
}
if (func->pci_dev) {
pci_stop_bus_device(func->pci_dev);
if (func->pci_dev->subordinate) {
disable_bridges(func->pci_dev->subordinate);
pci_disable_device(func->pci_dev);
}
}
}
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
acpiphp_unconfigure_ioapics(func->handle);
acpiphp_bus_trim(func->handle);
/* try to remove anyway.
* acpiphp_bus_add might have been failed */
if (!func->pci_dev)
continue;
pci_remove_bus_device(func->pci_dev);
pci_dev_put(func->pci_dev);
func->pci_dev = NULL;
}
slot->flags &= (~SLOT_ENABLED);
err_exit:
return retval;
}
/**
* get_slot_status - get ACPI slot status
* @slot: ACPI PHP slot
*
* If a slot has _STA for each function and if any one of them
* returned non-zero status, return it.
*
* If a slot doesn't have _STA and if any one of its functions'
* configuration space is configured, return 0x0f as a _STA.
*
* Otherwise return 0.
*/
static unsigned int get_slot_status(struct acpiphp_slot *slot)
{
acpi_status status;
unsigned long long sta = 0;
u32 dvid;
struct list_head *l;
struct acpiphp_func *func;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (func->flags & FUNC_HAS_STA) {
status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
if (ACPI_SUCCESS(status) && sta)
break;
} else {
pci_bus_read_config_dword(slot->bridge->pci_bus,
PCI_DEVFN(slot->device,
func->function),
PCI_VENDOR_ID, &dvid);
if (dvid != 0xffffffff) {
sta = ACPI_STA_ALL;
break;
}
}
}
return (unsigned int)sta;
}
/**
* acpiphp_eject_slot - physically eject the slot
* @slot: ACPI PHP slot
*/
int acpiphp_eject_slot(struct acpiphp_slot *slot)
{
acpi_status status;
struct acpiphp_func *func;
struct list_head *l;
struct acpi_object_list arg_list;
union acpi_object arg;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
/* We don't want to call _EJ0 on non-existing functions. */
if ((func->flags & FUNC_HAS_EJ0)) {
/* _EJ0 method take one argument */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = 1;
status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
if (ACPI_FAILURE(status)) {
warn("%s: _EJ0 failed\n", __func__);
return -1;
} else
break;
}
}
return 0;
}
/**
* acpiphp_check_bridge - re-enumerate devices
* @bridge: where to begin re-enumeration
*
* Iterate over all slots under this bridge and make sure that if a
* card is present they are enabled, and if not they are disabled.
*/
static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
{
struct acpiphp_slot *slot;
int retval = 0;
int enabled, disabled;
enabled = disabled = 0;
for (slot = bridge->slots; slot; slot = slot->next) {
unsigned int status = get_slot_status(slot);
if (slot->flags & SLOT_ENABLED) {
if (status == ACPI_STA_ALL)
continue;
retval = acpiphp_disable_slot(slot);
if (retval) {
err("Error occurred in disabling\n");
goto err_exit;
} else {
acpiphp_eject_slot(slot);
}
disabled++;
} else {
if (status != ACPI_STA_ALL)
continue;
retval = acpiphp_enable_slot(slot);
if (retval) {
err("Error occurred in enabling\n");
goto err_exit;
}
enabled++;
}
}
dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
err_exit:
return retval;
}
static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
{
u16 pci_cmd, pci_bctl;
struct pci_dev *cdev;
/* Program hpp values for this device */
if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
return;
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
return;
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
bridge->hpp.t0->cache_line_size);
pci_write_config_byte(dev, PCI_LATENCY_TIMER,
bridge->hpp.t0->latency_timer);
pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
if (bridge->hpp.t0->enable_serr)
pci_cmd |= PCI_COMMAND_SERR;
else
pci_cmd &= ~PCI_COMMAND_SERR;
if (bridge->hpp.t0->enable_perr)
pci_cmd |= PCI_COMMAND_PARITY;
else
pci_cmd &= ~PCI_COMMAND_PARITY;
pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
/* Program bridge control value and child devices */
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
bridge->hpp.t0->latency_timer);
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
if (bridge->hpp.t0->enable_serr)
pci_bctl |= PCI_BRIDGE_CTL_SERR;
else
pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
if (bridge->hpp.t0->enable_perr)
pci_bctl |= PCI_BRIDGE_CTL_PARITY;
else
pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
if (dev->subordinate) {
list_for_each_entry(cdev, &dev->subordinate->devices,
bus_list)
program_hpp(cdev, bridge);
}
}
}
static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
{
struct acpiphp_bridge bridge;
struct pci_dev *dev;
memset(&bridge, 0, sizeof(bridge));
bridge.handle = handle;
bridge.pci_bus = bus;
bridge.pci_dev = bus->self;
decode_hpp(&bridge);
list_for_each_entry(dev, &bus->devices, bus_list)
program_hpp(dev, &bridge);
}
/*
* Remove devices for which we could not assign resources, call
* arch specific code to fix-up the bus
*/
static void acpiphp_sanitize_bus(struct pci_bus *bus)
{
struct pci_dev *dev;
int i;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
list_for_each_entry(dev, &bus->devices, bus_list) {
for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
struct resource *res = &dev->resource[i];
if ((res->flags & type_mask) && !res->start &&
res->end) {
/* Could not assign a required resources
* for this device, remove it */
pci_remove_bus_device(dev);
break;
}
}
}
}
/* Program resources in newly inserted bridge */
static int acpiphp_configure_bridge (acpi_handle handle)
{
struct acpi_pci_id pci_id;
struct pci_bus *bus;
if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
err("cannot get PCI domain and bus number for bridge\n");
return -EINVAL;
}
bus = pci_find_bus(pci_id.segment, pci_id.bus);
if (!bus) {
err("cannot find bus %d:%d\n",
pci_id.segment, pci_id.bus);
return -EINVAL;
}
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);
acpiphp_sanitize_bus(bus);
acpiphp_set_hpp_values(handle, bus);
pci_enable_bridges(bus);
acpiphp_configure_ioapics(handle);
return 0;
}
static void handle_bridge_insertion(acpi_handle handle, u32 type)
{
struct acpi_device *device, *pdevice;
acpi_handle phandle;
if ((type != ACPI_NOTIFY_BUS_CHECK) &&
(type != ACPI_NOTIFY_DEVICE_CHECK)) {
err("unexpected notification type %d\n", type);
return;
}
acpi_get_parent(handle, &phandle);
if (acpi_bus_get_device(phandle, &pdevice)) {
dbg("no parent device, assuming NULL\n");
pdevice = NULL;
}
if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
err("cannot add bridge to acpi list\n");
return;
}
if (!acpiphp_configure_bridge(handle) &&
!acpi_bus_start(device))
add_bridge(handle);
else
err("cannot configure and start bridge\n");
}
/*
* ACPI event handlers
*/
static acpi_status
count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
struct acpiphp_bridge *bridge;
bridge = acpiphp_handle_to_bridge(handle);
if (bridge)
(*count)++;
return AE_OK ;
}
static acpi_status
check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
struct acpiphp_bridge *bridge;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
bridge = acpiphp_handle_to_bridge(handle);
if (bridge) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
dbg("%s: re-enumerating slots under %s\n",
__func__, objname);
acpiphp_check_bridge(bridge);
}
return AE_OK ;
}
/**
* handle_hotplug_event_bridge - handle ACPI event on bridges
* @handle: Notify()'ed acpi_handle
* @type: Notify code
* @context: pointer to acpiphp_bridge structure
*
* Handles ACPI event notification on {host,p2p} bridges.
*/
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
{
struct acpiphp_bridge *bridge;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
struct acpi_device *device;
int num_sub_bridges = 0;
if (acpi_bus_get_device(handle, &device)) {
/* This bridge must have just been physically inserted */
handle_bridge_insertion(handle, type);
return;
}
bridge = acpiphp_handle_to_bridge(handle);
if (type == ACPI_NOTIFY_BUS_CHECK) {
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
count_sub_bridges, &num_sub_bridges, NULL);
}
if (!bridge && !num_sub_bridges) {
err("cannot get bridge info\n");
return;
}
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
/* bus re-enumerate */
dbg("%s: Bus check notify on %s\n", __func__, objname);
if (bridge) {
dbg("%s: re-enumerating slots under %s\n",
__func__, objname);
acpiphp_check_bridge(bridge);
}
if (num_sub_bridges)
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
break;
case ACPI_NOTIFY_DEVICE_CHECK:
/* device check */
dbg("%s: Device check notify on %s\n", __func__, objname);
acpiphp_check_bridge(bridge);
break;
case ACPI_NOTIFY_DEVICE_WAKE:
/* wake event */
dbg("%s: Device wake notify on %s\n", __func__, objname);
break;
case ACPI_NOTIFY_EJECT_REQUEST:
/* request device eject */
dbg("%s: Device eject notify on %s\n", __func__, objname);
if ((bridge->type != BRIDGE_TYPE_HOST) &&
(bridge->flags & BRIDGE_HAS_EJ0)) {
struct acpiphp_slot *slot;
slot = bridge->func->slot;
if (!acpiphp_disable_slot(slot))
acpiphp_eject_slot(slot);
}
break;
case ACPI_NOTIFY_FREQUENCY_MISMATCH:
printk(KERN_ERR "Device %s cannot be configured due"
" to a frequency mismatch\n", objname);
break;
case ACPI_NOTIFY_BUS_MODE_MISMATCH:
printk(KERN_ERR "Device %s cannot be configured due"
" to a bus mode mismatch\n", objname);
break;
case ACPI_NOTIFY_POWER_FAULT:
printk(KERN_ERR "Device %s has suffered a power fault\n",
objname);
break;
default:
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
break;
}
}
/**
* handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
* @handle: Notify()'ed acpi_handle
* @type: Notify code
* @context: pointer to acpiphp_func structure
*
* Handles ACPI event notification on slots.
*/
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
{
struct acpiphp_func *func;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
func = (struct acpiphp_func *)context;
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
/* bus re-enumerate */
dbg("%s: Bus check notify on %s\n", __func__, objname);
acpiphp_enable_slot(func->slot);
break;
case ACPI_NOTIFY_DEVICE_CHECK:
/* device check : re-enumerate from parent bus */
dbg("%s: Device check notify on %s\n", __func__, objname);
acpiphp_check_bridge(func->slot->bridge);
break;
case ACPI_NOTIFY_DEVICE_WAKE:
/* wake event */
dbg("%s: Device wake notify on %s\n", __func__, objname);
break;
case ACPI_NOTIFY_EJECT_REQUEST:
/* request device eject */
dbg("%s: Device eject notify on %s\n", __func__, objname);
if (!(acpiphp_disable_slot(func->slot)))
acpiphp_eject_slot(func->slot);
break;
default:
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
break;
}
}
static acpi_status
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
if (acpi_root_bridge(handle)) {
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge, NULL);
(*count)++;
}
return AE_OK ;
}
static struct acpi_pci_driver acpi_pci_hp_driver = {
.add = add_bridge,
.remove = remove_bridge,
};
/**
* acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
*/
int __init acpiphp_glue_init(void)
{
int num = 0;
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
if (num <= 0)
return -1;
else
acpi_pci_register_driver(&acpi_pci_hp_driver);
return 0;
}
/**
* acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
*
* This function frees all data allocated in acpiphp_glue_init().
*/
void acpiphp_glue_exit(void)
{
acpi_pci_unregister_driver(&acpi_pci_hp_driver);
}
/**
* acpiphp_get_num_slots - count number of slots in a system
*/
int __init acpiphp_get_num_slots(void)
{
struct acpiphp_bridge *bridge;
int num_slots = 0;
list_for_each_entry (bridge, &bridge_list, list) {
dbg("Bus %04x:%02x has %d slot%s\n",
pci_domain_nr(bridge->pci_bus),
bridge->pci_bus->number, bridge->nr_slots,
bridge->nr_slots == 1 ? "" : "s");
num_slots += bridge->nr_slots;
}
dbg("Total %d slots\n", num_slots);
return num_slots;
}
#if 0
/**
* acpiphp_for_each_slot - call function for each slot
* @fn: callback function
* @data: context to be passed to callback function
*/
static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
{
struct list_head *node;
struct acpiphp_bridge *bridge;
struct acpiphp_slot *slot;
int retval = 0;
list_for_each (node, &bridge_list) {
bridge = (struct acpiphp_bridge *)node;
for (slot = bridge->slots; slot; slot = slot->next) {
retval = fn(slot, data);
if (!retval)
goto err_exit;
}
}
err_exit:
return retval;
}
#endif
/**
* acpiphp_enable_slot - power on slot
* @slot: ACPI PHP slot
*/
int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
int retval;
mutex_lock(&slot->crit_sect);
/* wake up all functions */
retval = power_on_slot(slot);
if (retval)
goto err_exit;
if (get_slot_status(slot) == ACPI_STA_ALL) {
/* configure all functions */
retval = enable_device(slot);
if (retval)
power_off_slot(slot);
} else {
dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
power_off_slot(slot);
}
err_exit:
mutex_unlock(&slot->crit_sect);
return retval;
}
/**
* acpiphp_disable_slot - power off slot
* @slot: ACPI PHP slot
*/
int acpiphp_disable_slot(struct acpiphp_slot *slot)
{
int retval = 0;
mutex_lock(&slot->crit_sect);
/* unconfigure all functions */
retval = disable_device(slot);
if (retval)
goto err_exit;
/* power off all functions */
retval = power_off_slot(slot);
if (retval)
goto err_exit;
err_exit:
mutex_unlock(&slot->crit_sect);
return retval;
}
/*
* slot enabled: 1
* slot disabled: 0
*/
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
{
return (slot->flags & SLOT_POWEREDON);
}
/*
* latch open: 1
* latch closed: 0
*/
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
{
unsigned int sta;
sta = get_slot_status(slot);
return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
}
/*
* adapter presence : 1
* absence : 0
*/
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
{
unsigned int sta;
sta = get_slot_status(slot);
return (sta == 0) ? 0 : 1;
}