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Subject[PATCH 10/12] PCI / ACPI / PM: Platform support for PCI PME wake-up (rev. 6)
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

Although the majority of PCI devices can generate PMEs that in
principle may be used to wake up devices suspended at run time,
platform support is generally necessary to convert PMEs into wake-up
events that can be delivered to the kernel. If ACPI is used for this
purpose, a PME generated by a PCI device will trigger the ACPI GPE
associated with the device to generate an ACPI wake-up event that we
can set up a handler for, provided that everything is configured
correctly.

Unfortunately, the subset of PCI devices that have GPEs associated
with them is quite limited and the other devices have to rely on
the GPEs associated with their upstream bridges and, possibly, the
root bridge to generate ACPI wake-up events in response to PMEs from
them. Moreover, ACPI-based PCI hotplug also uses ACPI notify
handlers that in general may conflict with the PM notify handlers,
unless this issue is specifically taken care of.

Add ACPI platform support for PCI PME wake-up:
o Add a framework making is possible to use ACPI system notify
handlers for both PM and hotplug at the same time and to take the
wake-up GPE sharing into account.
o Add new PCI platform callback ->run_wake() to struct
pci_platform_pm_ops allowing us to enable/disable the platform to
generate wake-up events for given device. Implemet this callback
for the ACPI platform.
o Define ACPI wake-up handlers for PCI devices and PCI buses and make
the PCI-ACPI binding code register wake-up notifiers for devices
associated with wake-up GPEs.
o Add function pci_dev_run_wake() which can be used by PCI drivers to
check if given device is capable of generating wake-up events at
run time.

Developed in cooperation with Matthew Garrett <mjg@redhat.com>.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/acpi/pci_bind.c | 14 +
drivers/acpi/pci_root.c | 8
drivers/pci/hotplug/acpiphp_glue.c | 23 --
drivers/pci/pci-acpi.c | 341 +++++++++++++++++++++++++++++++++++++
drivers/pci/pci.c | 67 +++++++
drivers/pci/pci.h | 7
include/acpi/acpi_bus.h | 1
include/linux/pci-acpi.h | 10 +
include/linux/pci.h | 1
9 files changed, 457 insertions(+), 15 deletions(-)
Index: linux-2.6/drivers/pci/pci.h
===================================================================
--- linux-2.6.orig/drivers/pci/pci.h
+++ linux-2.6/drivers/pci/pci.h
@@ -35,6 +35,10 @@ int pci_probe_reset_function(struct pci_
*
* @sleep_wake: enables/disables the system wake up capability of given device
*
+ * @run_wake: enables/disables the platform to generate run-time wake-up events
+ * for given device (the device's wake-up capability has to be
+ * enabled by @sleep_wake for this feature to work)
+ *
* If given platform is generally capable of power managing PCI devices, all of
* these callbacks are mandatory.
*/
@@ -44,12 +48,15 @@ struct pci_platform_pm_ops {
pci_power_t (*choose_state)(struct pci_dev *dev);
bool (*can_wakeup)(struct pci_dev *dev);
int (*sleep_wake)(struct pci_dev *dev, bool enable);
+ int (*run_wake)(struct pci_dev *dev, bool enable);
};

extern int pci_set_platform_pm(struct pci_platform_pm_ops *ops);
extern void pci_update_current_state(struct pci_dev *dev, pci_power_t state);
extern void pci_disable_enabled_device(struct pci_dev *dev);
extern bool pci_check_pme_status(struct pci_dev *dev);
+extern int __pci_pme_wakeup(struct pci_dev *dev, void *ign);
+extern void pci_pme_wakeup_bus(struct pci_bus *bus);
extern void pci_pm_init(struct pci_dev *dev);
extern void platform_pci_wakeup_init(struct pci_dev *dev);
extern void pci_allocate_cap_save_buffers(struct pci_dev *dev);
Index: linux-2.6/drivers/pci/pci-acpi.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci-acpi.c
+++ linux-2.6/drivers/pci/pci-acpi.c
@@ -16,8 +16,276 @@
#include <acpi/acpi_bus.h>

#include <linux/pci-acpi.h>
+#include <linux/pm_runtime.h>
#include "pci.h"

+static DEFINE_MUTEX(pci_acpi_notifier_mtx);
+
+struct pci_acpi_notify_data
+{
+ acpi_notify_handler hp_cb;
+ void *hp_data;
+ struct pci_bus *pci_bus;
+ struct pci_dev *pci_dev;
+};
+
+/**
+ * pci_acpi_event_fn - Universal system notification handler.
+ * @handle: ACPI handle of a device the notification is for.
+ * @event: Type of the signaled event.
+ * @ign: The value of this argument is ignored.
+ *
+ * Use @handle to obtain the address of the ACPI device object the event is
+ * signaled for. If this is a wake-up event, execute the appropriate PME
+ * handler for the bus or device represented by it (or both, if @dev is a
+ * bridge). If this is not a wake-up event, execute the hotplug notify handler
+ * for @handle.
+ */
+static void pci_acpi_event_fn(acpi_handle handle, u32 event, void *ign)
+{
+ struct acpi_device *dev;
+ struct pci_acpi_notify_data *nd;
+
+ if (ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
+ pr_warning("ACPI handle has no context in %s!\n", __func__);
+ return;
+ }
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ nd = dev->bus_data;
+ if (!nd)
+ goto out;
+
+ if (event == ACPI_NOTIFY_DEVICE_WAKE) {
+ if (nd->pci_bus) {
+ pci_pme_wakeup_bus(nd->pci_bus);
+ }
+ if (nd->pci_dev) {
+ pci_check_pme_status(nd->pci_dev);
+ pm_request_resume(&nd->pci_dev->dev);
+ }
+ } else if (nd->hp_cb) {
+ nd->hp_cb(handle, event, nd->hp_data);
+ }
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+}
+
+/**
+ * add_notify_data - Create a new notify data object for given ACPI device.
+ * @dev: Device to create the notify data object for.
+ */
+static struct pci_acpi_notify_data *add_notify_data(struct acpi_device *dev)
+{
+ struct pci_acpi_notify_data *nd;
+
+ nd = kzalloc(sizeof(*nd), GFP_KERNEL);
+ if (!nd)
+ return NULL;
+
+ dev->bus_data = nd;
+ return nd;
+}
+
+/**
+ * remove_notify_data - Remove the notify data object from given ACPI device.
+ * @dev: Device to remove the notify data object from.
+ */
+static void remove_notify_data(struct acpi_device *dev)
+{
+ kfree(dev->bus_data);
+ dev->bus_data = NULL;
+}
+
+/**
+ * pci_acpi_add_hp_notifier - Register a hotplug notifier for given device.
+ * @handle: ACPI handle of the device to register the notifier for.
+ * @handler: Callback to execute for hotplug events related to @handle.
+ * @context: Pointer to the context data to pass to @handler.
+ *
+ * Use @handle to get an ACPI device object and check if there is a notify data
+ * object for it. If this is the case, add @handler and @context to the
+ * existing notify data object, unless there already is a hotplug handler in
+ * there. Otherwise, create a new notify data object for the ACPI device
+ * associated with @handle and add @handler and @context to it.
+ */
+acpi_status pci_acpi_add_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler, void *context)
+{
+ struct pci_acpi_notify_data *nd;
+ struct acpi_device *dev;
+ acpi_status status = AE_OK;
+
+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev)))
+ return AE_NOT_FOUND;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ nd = dev->bus_data;
+ if (nd) {
+ if (!nd->hp_cb)
+ goto add;
+
+ status = AE_ALREADY_EXISTS;
+ goto out;
+ }
+
+ nd = add_notify_data(dev);
+ if (!nd) {
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn, NULL);
+ if (ACPI_FAILURE(status)) {
+ remove_notify_data(dev);
+ goto out;
+ }
+
+ add:
+ nd->hp_cb = handler;
+ nd->hp_data = context;
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(pci_acpi_add_hp_notifier);
+
+/**
+ * pci_acpi_remove_hp_notifier - Unregister a hotplug notifier for given device.
+ * @handle: ACPI handle of the device to unregister the notifier for.
+ * @handler: Callback executed for hotplug events related to @handle.
+ *
+ * Remove the hotplug callback and the pointer to the hotplug context data from
+ * the notify data object belonging to the device represented by @handle. If
+ * the notify data object is not necessary any more, remove it altogether.
+ */
+acpi_status pci_acpi_remove_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler)
+{
+ struct pci_acpi_notify_data *nd;
+ struct acpi_device *dev;
+ acpi_status status = AE_NOT_FOUND;
+
+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev)))
+ return AE_NOT_FOUND;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ nd = dev->bus_data;
+ if (!nd)
+ goto out;
+
+ nd->hp_data = NULL;
+ nd->hp_cb = NULL;
+
+ if (nd->pci_bus || nd->pci_dev)
+ goto out;
+
+ status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn);
+ remove_notify_data(dev);
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+EXPORT_SYMBOL_GPL(pci_acpi_remove_hp_notifier);
+
+/**
+ * pci_acpi_add_pm_notifier - Register PM notifier for given device.
+ * @dev: ACPI device to add the notifier for.
+ * @pci_dev: PCI device to check for the PME status if an event is signaled.
+ * @pci_bus: PCI bus to walk (checking PME status) if an event is signaled.
+ *
+ * Check if there is a notify data object for @dev and if that is the case, add
+ * @pci_dev to it as the device whose PME status should be checked whenever a PM
+ * event is signaled for @dev. Also, add @pci_bus to it as the bus to walk
+ * checking the PME status of all devices on it whenever a PM event is signaled
+ * for @dev.
+ *
+ * Otherwise, create a new notify data object for @dev and add both @pci_dev and
+ * @pci_bus to it.
+ *
+ * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
+ * PM wake-up events. For example, wake-up events may be generated for bridges
+ * if one of the devices below the bridge is signaling PME, even if the bridge
+ * itself doesn't have a wake-up GPE associated with it.
+ */
+acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev,
+ struct pci_bus *pci_bus)
+{
+ struct pci_acpi_notify_data *nd;
+ acpi_status status = AE_OK;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ nd = dev->bus_data;
+ if (nd)
+ goto add;
+
+ nd = add_notify_data(dev);
+ if (!nd) {
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ status = acpi_install_notify_handler(dev->handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn, NULL);
+ if (ACPI_FAILURE(status)) {
+ remove_notify_data(dev);
+ goto out;
+ }
+
+ add:
+ nd->pci_dev = pci_dev;
+ nd->pci_bus = pci_bus;
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+
+/**
+ * pci_acpi_remove_pm_notifier - Unregister PM notifier for given device.
+ * @dev: ACPI device to remove the notifier from.
+ *
+ * Find the notify data object for @dev and clear its @pci_dev and @pci_bus
+ * fields. If the notify data object is not necessary any more after that,
+ * remove it too.
+ */
+acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
+{
+ struct pci_acpi_notify_data *nd;
+ acpi_status status = AE_NOT_FOUND;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ nd = dev->bus_data;
+ if (!nd)
+ goto out;
+
+ nd->pci_dev = NULL;
+ nd->pci_bus = NULL;
+
+ if (nd->hp_cb)
+ goto out;
+
+ status = acpi_remove_notify_handler(dev->handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn);
+ remove_notify_data(dev);
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+
/*
* _SxD returns the D-state with the highest power
* (lowest D-state number) supported in the S-state "x".
@@ -131,12 +399,85 @@ static int acpi_pci_sleep_wake(struct pc
return 0;
}

+/**
+ * acpi_dev_run_wake_enable - Enable/disable wake-up for given device.
+ * @phys_dev: Device to enable/disable the platform to wake-up the system for.
+ * @enable: Whether enable or disable the wake-up functionality.
+ *
+ * Find the ACPI device object corresponding to @pci_dev and try to
+ * enable/disable the GPE associated with it.
+ */
+static int acpi_dev_run_wake_enable(struct device *phys_dev, bool enable)
+{
+ struct acpi_device *dev;
+ acpi_handle handle;
+ int error = -ENODEV;
+
+ if (!device_run_wake(phys_dev))
+ return -EINVAL;
+
+ handle = DEVICE_ACPI_HANDLE(phys_dev);
+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
+ dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ if (enable) {
+ if (!dev->wakeup.run_wake_count++) {
+ acpi_pm_wakeup_power(dev, true);
+ acpi_ref_runtime_gpe(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number);
+ }
+ } else if (dev->wakeup.run_wake_count > 0) {
+ if (!--dev->wakeup.run_wake_count) {
+ acpi_unref_runtime_gpe(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number);
+ acpi_pm_wakeup_power(dev, false);
+ }
+ } else {
+ error = -EALREADY;
+ }
+
+ return error;
+}
+
+static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
+{
+ while (bus->parent) {
+ struct pci_dev *bridge = bus->self;
+
+ if (bridge->pme_interrupt)
+ return;
+ if (!acpi_dev_run_wake_enable(&bridge->dev, enable))
+ return;
+ bus = bus->parent;
+ }
+
+ /* We have reached the root bus. */
+ if (bus->bridge)
+ acpi_dev_run_wake_enable(bus->bridge, enable);
+}
+
+static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
+{
+ if (dev->pme_interrupt)
+ return 0;
+
+ if (!acpi_dev_run_wake_enable(&dev->dev, enable))
+ return 0;
+
+ acpi_pci_propagate_run_wake(dev->bus, enable);
+ return 0;
+}
+
static struct pci_platform_pm_ops acpi_pci_platform_pm = {
.is_manageable = acpi_pci_power_manageable,
.set_state = acpi_pci_set_power_state,
.choose_state = acpi_pci_choose_state,
.can_wakeup = acpi_pci_can_wakeup,
.sleep_wake = acpi_pci_sleep_wake,
+ .run_wake = acpi_pci_run_wake,
};

/* ACPI bus type */
Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -21,6 +21,7 @@
#include <linux/interrupt.h>
#include <asm/dma.h> /* isa_dma_bridge_buggy */
#include <linux/device.h>
+#include <linux/pm_runtime.h>
#include <asm/setup.h>
#include "pci.h"

@@ -447,6 +448,12 @@ static inline int platform_pci_sleep_wak
pci_platform_pm->sleep_wake(dev, enable) : -ENODEV;
}

+static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable)
+{
+ return pci_platform_pm ?
+ pci_platform_pm->run_wake(dev, enable) : -ENODEV;
+}
+
/**
* pci_raw_set_power_state - Use PCI PM registers to set the power state of
* given PCI device
@@ -1215,6 +1222,31 @@ bool pci_check_pme_status(struct pci_dev
}

/**
+ * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
+ * @dev: Device to handle.
+ * @ign: Ignored.
+ *
+ * Check if @dev has generated PME and queue a resume request for it in that
+ * case.
+ */
+static int pci_pme_wakeup(struct pci_dev *dev, void *ign)
+{
+ if (pci_check_pme_status(dev))
+ pm_request_resume(&dev->dev);
+ return 0;
+}
+
+/**
+ * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
+ * @bus: Top bus of the subtree to walk.
+ */
+void pci_pme_wakeup_bus(struct pci_bus *bus)
+{
+ if (bus)
+ pci_walk_bus(bus, pci_pme_wakeup, NULL);
+}
+
+/**
* pci_pme_capable - check the capability of PCI device to generate PME#
* @dev: PCI device to handle.
* @state: PCI state from which device will issue PME#.
@@ -1419,6 +1451,41 @@ int pci_back_from_sleep(struct pci_dev *
}

/**
+ * pci_dev_run_wake - Check if device can generate run-time wake-up events.
+ * @dev: Device to check.
+ *
+ * Return true if the device itself is cabable of generating wake-up events
+ * (through the platform or using the native PCIe PME) or if the device supports
+ * PME and one of its upstream bridges can generate wake-up events.
+ */
+bool pci_dev_run_wake(struct pci_dev *dev)
+{
+ struct pci_bus *bus = dev->bus;
+
+ if (device_run_wake(&dev->dev))
+ return true;
+
+ if (!dev->pme_support)
+ return false;
+
+ while (bus->parent) {
+ struct pci_dev *bridge = bus->self;
+
+ if (device_run_wake(&bridge->dev))
+ return true;
+
+ bus = bus->parent;
+ }
+
+ /* We have reached the root bus. */
+ if (bus->bridge)
+ return device_run_wake(bus->bridge);
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(pci_dev_run_wake);
+
+/**
* pci_pm_init - Initialize PM functions of given PCI device
* @dev: PCI device to handle.
*/
Index: linux-2.6/include/linux/pci-acpi.h
===================================================================
--- linux-2.6.orig/include/linux/pci-acpi.h
+++ linux-2.6/include/linux/pci-acpi.h
@@ -11,6 +11,16 @@
#include <linux/acpi.h>

#ifdef CONFIG_ACPI
+extern acpi_status pci_acpi_add_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler,
+ void *context);
+extern acpi_status pci_acpi_remove_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler);
+extern acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev,
+ struct pci_bus *pci_bus);
+extern acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev);
+
static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
{
struct pci_bus *pbus = pdev->bus;
Index: linux-2.6/drivers/acpi/pci_bind.c
===================================================================
--- linux-2.6.orig/drivers/acpi/pci_bind.c
+++ linux-2.6/drivers/acpi/pci_bind.c
@@ -26,7 +26,9 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
+#include <linux/pci-acpi.h>
#include <linux/acpi.h>
+#include <linux/pm_runtime.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

@@ -38,7 +40,13 @@ static int acpi_pci_unbind(struct acpi_d
struct pci_dev *dev;

dev = acpi_get_pci_dev(device->handle);
- if (!dev || !dev->subordinate)
+ if (!dev)
+ goto out;
+
+ device_set_run_wake(&dev->dev, false);
+ pci_acpi_remove_pm_notifier(device);
+
+ if (!dev->subordinate)
goto out;

acpi_pci_irq_del_prt(dev->subordinate);
@@ -62,6 +70,10 @@ static int acpi_pci_bind(struct acpi_dev
if (!dev)
return 0;

+ pci_acpi_add_pm_notifier(device, dev, dev->subordinate);
+ if (device->wakeup.flags.run_wake)
+ device_set_run_wake(&dev->dev, true);
+
/*
* Install the 'bind' function to facilitate callbacks for
* children of the P2P bridge.
Index: linux-2.6/drivers/pci/hotplug/acpiphp_glue.c
===================================================================
--- linux-2.6.orig/drivers/pci/hotplug/acpiphp_glue.c
+++ linux-2.6/drivers/pci/hotplug/acpiphp_glue.c
@@ -236,8 +236,7 @@ register_slot(acpi_handle handle, u32 lv

/* install notify handler */
if (!(newfunc->flags & FUNC_HAS_DCK)) {
- status = acpi_install_notify_handler(handle,
- ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_add_hp_notifier(handle,
handle_hotplug_event_func,
newfunc);

@@ -288,14 +287,12 @@ static void init_bridge_misc(struct acpi
/* 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,
+ status = pci_acpi_remove_hp_notifier(bridge->func->handle,
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,
+ status = pci_acpi_add_hp_notifier(bridge->handle,
handle_hotplug_event_bridge,
bridge);

@@ -505,15 +502,14 @@ static void cleanup_bridge(struct acpiph
acpi_status status;
acpi_handle handle = bridge->handle;

- status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_remove_hp_notifier(handle,
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,
+ status = pci_acpi_add_hp_notifier(bridge->func->handle,
handle_hotplug_event_func,
bridge->func);
if (ACPI_FAILURE(status))
@@ -529,8 +525,7 @@ static void cleanup_bridge(struct acpiph
unregister_dock_notifier(&func->nb);
}
if (!(func->flags & FUNC_HAS_DCK)) {
- status = acpi_remove_notify_handler(func->handle,
- ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_remove_hp_notifier(func->handle,
handle_hotplug_event_func);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
@@ -592,7 +587,7 @@ static void remove_bridge(acpi_handle ha
if (bridge)
cleanup_bridge(bridge);
else
- acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_remove_hp_notifier(handle,
handle_hotplug_event_bridge);
}

@@ -1278,8 +1273,8 @@ find_root_bridges(acpi_handle handle, u3
int *count = (int *)context;

if (acpi_is_root_bridge(handle)) {
- acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
- handle_hotplug_event_bridge, NULL);
+ pci_acpi_add_hp_notifier(handle,
+ handle_hotplug_event_bridge, NULL);
(*count)++;
}
return AE_OK ;
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -752,6 +752,7 @@ int pci_wake_from_d3(struct pci_dev *dev
pci_power_t pci_target_state(struct pci_dev *dev);
int pci_prepare_to_sleep(struct pci_dev *dev);
int pci_back_from_sleep(struct pci_dev *dev);
+bool pci_dev_run_wake(struct pci_dev *dev);

/* Functions for PCI Hotplug drivers to use */
int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
Index: linux-2.6/include/acpi/acpi_bus.h
===================================================================
--- linux-2.6.orig/include/acpi/acpi_bus.h
+++ linux-2.6/include/acpi/acpi_bus.h
@@ -282,6 +282,7 @@ struct acpi_device {
struct device dev;
struct acpi_bus_ops bus_ops; /* workaround for different code path for hotplug */
enum acpi_bus_removal_type removal_type; /* indicate for different removal type */
+ void *bus_data;
};

static inline void *acpi_driver_data(struct acpi_device *d)
Index: linux-2.6/drivers/acpi/pci_root.c
===================================================================
--- linux-2.6.orig/drivers/acpi/pci_root.c
+++ linux-2.6/drivers/acpi/pci_root.c
@@ -30,6 +30,7 @@
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/acpi.h>
@@ -528,6 +529,10 @@ static int __devinit acpi_pci_root_add(s
if (flags != base_flags)
acpi_pci_osc_support(root, flags);

+ pci_acpi_add_pm_notifier(device, NULL, root->bus);
+ if (device->wakeup.flags.run_wake)
+ device_set_run_wake(root->bus->bridge, true);
+
return 0;

end:
@@ -549,6 +554,9 @@ static int acpi_pci_root_remove(struct a
{
struct acpi_pci_root *root = acpi_driver_data(device);

+ device_set_run_wake(root->bus->bridge, false);
+ pci_acpi_remove_pm_notifier(device);
+
kfree(root);
return 0;
}


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