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OpenCloudOS-Kernel/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_bridge has its refcount elevated by pci_get_slot()
* when the bridge is scanned and it loses a refcount when the bridge
* is removed.
* - When a P2P bridge is present, we elevate the refcount on the subordinate
* bus. It loses the refcount when the the driver unloads.
*/
#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 <linux/slab.h>
#include "../pci.h"
#include "acpiphp.h"
static LIST_HEAD(bridge_list);
#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(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;
struct pci_dev *pdev;
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) {
if (retval == -EBUSY)
warn("Slot %llu already registered by another "
"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);
pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
if (pdev) {
pdev->current_state = PCI_D0;
slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
pci_dev_put(pdev);
}
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(acpi_handle handle)
{
int found = acpi_pci_detect_ejectable(handle);
if (!found) {
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
is_pci_dock_device, NULL, (void *)&found, NULL);
}
return found;
}
/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
static void init_bridge_misc(struct acpiphp_bridge *bridge)
{
acpi_status status;
/* 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, NULL, 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 acpiphp_bridge *bridge;
struct acpiphp_slot *slot;
struct acpiphp_func *func;
list_for_each_entry(bridge, &bridge_list, list) {
for (slot = bridge->slots; slot; slot = slot->next) {
list_for_each_entry(func, &slot->funcs, 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 acpiphp_bridge *bridge;
struct acpi_pci_root *root = acpi_pci_find_root(handle);
bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
if (bridge == NULL)
return;
bridge->type = BRIDGE_TYPE_HOST;
bridge->handle = handle;
bridge->pci_bus = root->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 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 = acpi_get_pci_dev(handle);
bridge->pci_bus = bridge->pci_dev->subordinate;
if (!bridge->pci_bus) {
err("This is not a PCI-to-PCI bridge!\n");
goto err;
}
/*
* Grab a ref to the subordinate PCI bus in case the bus is
* removed via PCI core logical hotplug. The ref pins the bus
* (which we access during module unload).
*/
get_device(&bridge->pci_bus->dev);
spin_lock_init(&bridge->res_lock);
init_bridge_misc(bridge);
return;
err:
pci_dev_put(bridge->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;
struct pci_dev *dev;
dev = acpi_get_pci_dev(handle);
if (!dev || !dev->subordinate)
goto out;
/* check if this bridge has ejectable slots */
if ((detect_ejectable_slots(handle) > 0)) {
dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
add_p2p_bridge(handle);
}
/* search P2P bridges under this p2p bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
find_p2p_bridge, NULL, NULL, 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;
acpi_handle dummy_handle;
/* 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;
}
/* check if this bridge has ejectable slots */
if (detect_ejectable_slots(handle) > 0) {
dbg("found PCI host-bus bridge with hot-pluggable slots\n");
add_host_bridge(handle);
}
/* search P2P bridges under this host bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
find_p2p_bridge, NULL, NULL, 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 acpiphp_bridge *bridge;
list_for_each_entry(bridge, &bridge_list, list)
if (bridge->handle == handle)
return bridge;
return NULL;
}
static void cleanup_bridge(struct acpiphp_bridge *bridge)
{
struct acpiphp_slot *slot, *next;
struct acpiphp_func *func, *tmp;
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) {
next = slot->next;
list_for_each_entry_safe(func, tmp, &slot->funcs, 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");
}
list_del(&func->sibling);
kfree(func);
}
acpiphp_unregister_hotplug_slot(slot);
list_del(&slot->funcs);
kfree(slot);
slot = next;
}
/*
* Only P2P bridges have a pci_dev
*/
if (bridge->pci_dev)
put_device(&bridge->pci_bus->dev);
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, 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, NULL);
/*
* On root bridges with hotplug slots directly underneath (ie,
* no p2p bridge between), 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 int power_on_slot(struct acpiphp_slot *slot)
{
acpi_status status;
struct acpiphp_func *func;
int retval = 0;
/* if already enabled, just skip */
if (slot->flags & SLOT_POWEREDON)
goto err_exit;
list_for_each_entry(func, &slot->funcs, 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;
int retval = 0;
/* if already disabled, just skip */
if ((slot->flags & SLOT_POWEREDON) == 0)
goto err_exit;
list_for_each_entry(func, &slot->funcs, 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;
}
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;
}
static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
{
struct acpiphp_func *func;
union acpi_object params[2];
struct acpi_object_list arg_list;
list_for_each_entry(func, &slot->funcs, sibling) {
arg_list.count = 2;
arg_list.pointer = params;
params[0].type = ACPI_TYPE_INTEGER;
params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = 1;
/* _REG is optional, we don't care about if there is failure */
acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
}
}
/**
* 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 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_entry(func, &slot->funcs, sibling)
acpiphp_bus_add(func);
pci_bus_assign_resources(bus);
acpiphp_sanitize_bus(bus);
acpiphp_set_hpp_values(bus);
acpiphp_set_acpi_region(slot);
pci_enable_bridges(bus);
pci_bus_add_devices(bus);
list_for_each_entry(func, &slot->funcs, sibling) {
dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
func->function));
if (!dev)
continue;
if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
pci_dev_put(dev);
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);
pci_dev_put(dev);
}
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)
{
struct acpiphp_func *func;
struct pci_dev *pdev;
/* is this slot already disabled? */
if (!(slot->flags & SLOT_ENABLED))
goto err_exit;
list_for_each_entry(func, &slot->funcs, sibling) {
if (func->bridge) {
/* cleanup p2p bridges under this P2P bridge */
cleanup_p2p_bridge(func->bridge->handle,
(u32)1, NULL, NULL);
func->bridge = NULL;
}
pdev = pci_get_slot(slot->bridge->pci_bus,
PCI_DEVFN(slot->device, func->function));
if (pdev) {
pci_stop_bus_device(pdev);
if (pdev->subordinate) {
disable_bridges(pdev->subordinate);
pci_disable_device(pdev);
}
pci_remove_bus_device(pdev);
pci_dev_put(pdev);
}
}
list_for_each_entry(func, &slot->funcs, sibling) {
acpiphp_bus_trim(func->handle);
}
slot->flags &= (~SLOT_ENABLED);
err_exit:
return 0;
}
/**
* 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 acpiphp_func *func;
list_for_each_entry(func, &slot->funcs, 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 acpi_object_list arg_list;
union acpi_object arg;
list_for_each_entry(func, &slot->funcs, 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 acpiphp_set_hpp_values(struct pci_bus *bus)
{
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list)
pci_configure_slot(dev);
}
/*
* 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 pci_bus *bus;
if (acpi_is_root_bridge(handle)) {
struct acpi_pci_root *root = acpi_pci_find_root(handle);
bus = root->bus;
} else {
struct pci_dev *pdev = acpi_get_pci_dev(handle);
bus = pdev->subordinate;
pci_dev_put(pdev);
}
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);
acpiphp_sanitize_bus(bus);
acpiphp_set_hpp_values(bus);
pci_enable_bridges(bus);
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, NULL, &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, 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_is_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, NULL, &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;
}
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