diff mbox

[RFC,3/4] PCI / ACPI PM: Platform support for PCI PME wake-up (rev. 2)

Message ID 200910090054.18693.rjw@sisk.pl
State Superseded, archived
Headers show

Commit Message

Rafael Wysocki Oct. 8, 2009, 10:54 p.m. UTC
None
diff mbox

Patch

Index: linux-2.6/drivers/pci/pci.h
===================================================================
--- linux-2.6.orig/drivers/pci/pci.h
+++ linux-2.6/drivers/pci/pci.h
@@ -30,10 +30,14 @@  int pci_probe_reset_function(struct pci_
  *                platform; to be used during system-wide transitions from a
  *                sleeping state to the working state and vice versa
  *
- * @can_wakeup: returns 'true' if given device is capable of waking up the
- *              system from a sleeping state
+ * @can_wakeup: returns 'true' if the plaform can generate wake-up events for
+ *		given device.
  *
- * @sleep_wake: enables/disables the system wake up capability of given device
+ * @sleep_wake: enables/disables the 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.
@@ -44,16 +48,25 @@  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 int pci_platform_run_wake(struct pci_dev *dev, bool enable);
 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);
 
+static inline void pci_pme_wakeup(struct pci_dev *dev)
+{
+	__pci_pme_wakeup(dev, NULL);
+}
+
 static inline bool pci_is_bridge(struct pci_dev *pci_dev)
 {
 	return !!(pci_dev->subordinate);
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
@@ -19,6 +19,682 @@ 
 #include "pci.h"
 
 /*
+ * ACPI-based PCI run-time power management uses ACPI system notify handlers,
+ * which are also used by ACPI-based PCI hotplug.  Unfortunately, however, there
+ * can be only one ACPI system notify handler installed for an ACPI device
+ * handle.  For this reason there has to be a way to use the same notify handler
+ * for both ACPI-based hotplug and ACPI-based run-time PM.
+ *
+ * Moreover, there may be many PCI devices, including bridges, that share one
+ * wake-up GPE and if a wake-up event is signaled for a bridge, we will check
+ * the PME status of all devices below it, so if a device below a bridge shares
+ * a wake-up GPE with the bridge, it only makes sense to install a notify
+ * handled for the bridge, because the device is going to be checked anyway in
+ * the process of handling the bridge notification.  In particular, if any
+ * devices share a wake-up GPE with the root bridge, there only need to be a
+ * notify handler for the root bridge, because the other devices will be checked
+ * in the process of handling the root bridge wake-up.
+ *
+ * Furthermore, if many devices share one wake-up GPE, we only need to install
+ * a notify handler for one of them as long as we know which devices to check
+ * in the process of handling the notification.  The purpose of the data
+ * structures and helper functions below is to arrange things in accordance with
+ * these observations.
+ *
+ * pci_acpi_runtime_notifiers is a list of struct pci_acpi_notifier_block
+ * objects that each represent ACPI devices that have ACPI system notify
+ * handlers installed.  For each of them, there is a ACPI-based hotplug notifier
+ * to execute for hotplug events, hp_cb, and a pointer to the data to pass to it
+ * hp_data, as well as a list of PCI buses and a list of PCI devices for which
+ * to execute PME handlers in the case of ACPI-based PM events.  Since every
+ * object may represent multiple PCI devices and/or buses to handle if power
+ * management event is signaled via the GPE associated with it, there are
+ * reference counters for tracking the usage of each object.
+ */
+
+static LIST_HEAD(pci_acpi_runtime_notifiers);
+static DEFINE_MUTEX(pci_acpi_notifier_mtx);
+
+struct pci_acpi_notifier_block
+{
+	struct list_head entry;
+	struct acpi_device *dev;
+	acpi_notify_handler hp_cb;
+	void *hp_data;
+	struct list_head pm_buses;
+	struct list_head pm_devices;
+	int pm_enable_count;
+};
+
+struct pci_bus_notifier_entry
+{
+	struct list_head entry;
+	struct pci_bus *bus;
+	int enable_count;
+};
+
+struct pci_dev_notifier_entry
+{
+	struct list_head entry;
+	struct pci_dev *dev;
+	bool enabled;
+};
+
+/**
+ * pci_acpi_event_fn - Universal system notification handler.
+ * @handle: ACPI handle of a device the notification is for.
+ * @event: Type of the signaled event.
+ * @data: Context data, should be a pointer to a notifier object.
+ *
+ * Take the address on a notifier object from @data and use it to extract the
+ * information needed for handling the event.  If this is a wake-up event,
+ * check if PM notification is enabled for this notifier object and, if so,
+ * execute the appropriate PME handler for each bus and for each devices that
+ * should be checked for the PME status.  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 *data)
+{
+	struct pci_acpi_notifier_block *nb = data;
+
+	if (!nb)
+		return;
+
+	mutex_lock(&pci_acpi_notifier_mtx);
+
+	if (event == ACPI_NOTIFY_DEVICE_WAKE && nb->pm_enable_count) {
+		if (!list_empty(&nb->pm_buses)) {
+			struct pci_bus_notifier_entry *bne;
+
+			list_for_each_entry(bne, &nb->pm_buses, entry)
+				if (bne->enable_count)
+					pci_pme_wakeup_bus(bne->bus);
+		}
+		if (!list_empty(&nb->pm_devices)) {
+			struct pci_dev_notifier_entry *dne;
+
+			list_for_each_entry(dne, &nb->pm_devices, entry)
+				if (dne->enabled)
+					pci_pme_wakeup(dne->dev);
+		}
+	} else if (nb->hp_cb) {
+		nb->hp_cb(handle, event, nb->hp_data);
+	}
+
+	mutex_unlock(&pci_acpi_notifier_mtx);
+}
+
+/**
+ * new_notifier - Create a new notifier object for given ACPI device.
+ * @dev: Device to create the notifier object for.
+ */
+static struct pci_acpi_notifier_block *new_notifier(struct acpi_device *dev)
+{
+	struct pci_acpi_notifier_block *nb;
+
+	nb = kzalloc(sizeof(*nb), GFP_KERNEL);
+	if (!nb)
+		return NULL;
+
+	nb->dev = dev;
+	INIT_LIST_HEAD(&nb->pm_buses);
+	INIT_LIST_HEAD(&nb->pm_devices);
+
+	return nb;
+}
+
+/**
+ * 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 notifier
+ * object for it.  If this is the case, add @handler and @context to the
+ * existing notifier object, unless there already is a hotplug handler in this
+ * notifier object.  Otherwise, create a new notifier 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_notifier_block *nb;
+	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);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+		if (nb->dev != dev)
+			continue;
+
+		if (!nb->hp_cb) {
+			nb->hp_cb = handler;
+			nb->hp_data = context;
+		} else {
+			status = AE_ALREADY_EXISTS;
+		}
+		goto out;
+	}
+
+	nb = new_notifier(dev);
+	if (!nb) {
+		status = AE_NO_MEMORY;
+		goto out;
+	}
+	nb->hp_cb = handler;
+	nb->hp_data = context;
+
+	list_add_tail(&nb->entry, &pci_acpi_runtime_notifiers);
+
+	status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+						pci_acpi_event_fn, nb);
+	if (ACPI_FAILURE(status)) {
+		list_del(&nb->entry);
+		kfree(nb);
+	}
+
+ 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.
+ *
+ * Find the notifier object associated with @handle and remove the hotplug
+ * callback and the pointer to the hotplug context data from it.  If the
+ * notifier 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_notifier_block *nb;
+	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);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry)
+		if (nb->dev == dev)
+			goto found;
+
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return AE_NOT_FOUND;
+
+ found:
+	if (list_empty(&nb->pm_buses) && list_empty(&nb->pm_devices)) {
+		status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+							pci_acpi_event_fn);
+		list_del(&nb->entry);
+		kfree(nb);
+	} else {
+		nb->hp_data = NULL;
+		nb->hp_cb = NULL;
+	}
+
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return status;
+}
+EXPORT_SYMBOL_GPL(pci_acpi_remove_hp_notifier);
+
+/**
+ * bus_match - Check if one PCI bus is upstream from another.
+ * @target: PCI bus expected to be upstream from the other.
+ * @bus: PCI bus expected to be downstream from the other.
+ *
+ * Return 'ture' if @target is upstream with respect to @bus.
+ */
+static inline bool bus_match(struct pci_bus *target, struct pci_bus *bus)
+{
+	return pci_domain_nr(target) == pci_domain_nr(bus)
+		&& (pci_is_root_bus(target) || (bus->number >= target->number
+		    && bus->number <= target->subordinate));
+}
+
+/**
+ * new_dev_entry - Create a new device notifier entry.
+ * @dev: PCI device to create the entry for.
+ * @list: List to add the new entry to.
+ */
+static struct pci_dev_notifier_entry *new_dev_entry(struct pci_dev *dev,
+						    struct list_head *list)
+{
+	struct pci_dev_notifier_entry *dne;
+
+	dne = kzalloc(sizeof(*dne), GFP_KERNEL);
+	if (!dne)
+		return NULL;
+
+	dne->dev = dev;
+	list_add_tail(&dne->entry, list);
+
+	return dne;
+}
+
+/**
+ * pci_acpi_add_device_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.
+ *
+ * Check if there is a notifier object for @dev and if that is the case, add
+ * @pci_dev to its list of devices whose PME status should be checked if a PM
+ * event is signaled for @dev, unless @pci_dev is covered by one of the buses
+ * in the notifier's bus list.  Otherwise, create a new notifier object for @dev
+ * and add @pci_dev to its list of devices whose PME status to check.
+ */
+acpi_status pci_acpi_add_device_pm_notifier(struct acpi_device *dev,
+					    struct pci_dev *pci_dev)
+{
+	struct pci_acpi_notifier_block *nb;
+	struct pci_dev_notifier_entry *dne;
+	struct pci_bus *bus = pci_dev->bus;
+	acpi_status status = AE_OK;
+
+	if (!dev->wakeup.flags.valid)
+		return AE_BAD_PARAMETER;
+
+	mutex_lock(&pci_acpi_notifier_mtx);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+		struct pci_bus_notifier_entry *bne;
+
+		if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+			continue;
+
+		list_for_each_entry(bne, &nb->pm_buses, entry)
+			if (bus_match(bne->bus, bus))
+				goto out;
+
+		list_for_each_entry(dne, &nb->pm_devices, entry)
+			if (dne->dev == pci_dev)
+				goto out;
+
+		if (!new_dev_entry(pci_dev, &nb->pm_devices))
+			status = AE_NO_MEMORY;
+		goto out;
+	}
+
+	nb = new_notifier(dev);
+	if (!nb) {
+		status = AE_NO_MEMORY;
+		goto out;
+	}
+
+	dne = new_dev_entry(pci_dev, &nb->pm_devices);
+	if (!dne) {
+		kfree(nb);
+		status = AE_NO_MEMORY;
+		goto out;
+	}
+
+	list_add_tail(&nb->entry, &pci_acpi_runtime_notifiers);
+
+	status = acpi_install_notify_handler(dev->handle, ACPI_SYSTEM_NOTIFY,
+						pci_acpi_event_fn, nb);
+	if (ACPI_FAILURE(status)) {
+		list_del(&dne->entry);
+		kfree(dne);
+		list_del(&nb->entry);
+		kfree(nb);
+	}
+
+ out:
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return status;
+}
+
+/**
+ * pci_acpi_remove_device_pm_notifier - Unregister PM notifier for given device.
+ * @dev: ACPI device to remove the notifier from.
+ * @pci_dev: PCI device whose PME status is checked if an event is signaled.
+ *
+ * Find the notifier object for @dev and remove @pci_dev from its list of
+ * devices whose PME status to check when wake-up event is signaled.  If the
+ * notifier object is not necessary any more after that, remove it too.
+ */
+acpi_status pci_acpi_remove_device_pm_notifier(struct acpi_device *dev,
+					       struct pci_dev *pci_dev)
+{
+	struct pci_acpi_notifier_block *nb;
+	struct pci_dev_notifier_entry *dne = NULL;
+	acpi_status status = AE_OK;
+
+	mutex_lock(&pci_acpi_notifier_mtx);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+		if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+			continue;
+
+		list_for_each_entry(dne, &nb->pm_devices, entry)
+			if (dne->dev == pci_dev)
+				goto found;
+	}
+
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return AE_NOT_FOUND;
+
+ found:
+	if (dne->enabled) {
+		if (!--nb->pm_enable_count)
+			acpi_device_run_wake(nb->dev, false);
+	}
+	list_del(&dne->entry);
+	kfree(dne);
+
+	if (list_empty(&nb->pm_devices) && list_empty(&nb->pm_buses)
+	    && !nb->hp_cb) {
+		status = acpi_remove_notify_handler(nb->dev->handle,
+							ACPI_SYSTEM_NOTIFY,
+							pci_acpi_event_fn);
+		list_del(&nb->entry);
+		kfree(nb);
+	}
+
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return status;
+}
+
+/**
+ * new_bus_entry - Create a new bus notifier entry.
+ * @bus: PCI bus to create the entry for.
+ * @list: List to add the new entry to.
+ */
+static struct pci_bus_notifier_entry *new_bus_entry(struct pci_bus *bus,
+						    struct list_head *list)
+{
+	struct pci_bus_notifier_entry *bne;
+
+	bne = kzalloc(sizeof(*bne), GFP_KERNEL);
+	if (!bne)
+		return NULL;
+
+	bne->bus = bus;
+	list_add_tail(&bne->entry, list);
+
+	return bne;
+}
+
+/**
+ * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
+ * @dev: ACPI device to add the notifier for.
+ * @bus: PCI bus to walk if an event is signaled.
+ *
+ * Check if there is a notifier object for @dev and if that is the case, add
+ * @bus to its list of buses to walk, checking the PME status of all devices on
+ * them, if a PM event is signaled for @dev, unless @bus or a PCI bus upstream
+ * with respect to it is in the list already.  Otherwise, create a new notifier
+ * object for @dev and add @bus to its list of buses to walk if a PM event is
+ * signaled.
+ */
+acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
+					 struct pci_bus *bus)
+{
+	struct pci_acpi_notifier_block *nb;
+	struct pci_bus_notifier_entry *bne;
+	acpi_status status = AE_OK;
+
+	if (!dev->wakeup.flags.valid)
+		return AE_BAD_PARAMETER;
+
+	mutex_lock(&pci_acpi_notifier_mtx);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+		if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+			continue;
+
+		list_for_each_entry(bne, &nb->pm_buses, entry)
+			if (bus_match(bne->bus, bus))
+				goto out;
+
+		if (!new_bus_entry(bus, &nb->pm_buses))
+			status = AE_NO_MEMORY;
+		goto out;
+	}
+
+	nb = new_notifier(dev);
+	if (!nb) {
+		status = AE_NO_MEMORY;
+		goto out;
+	}
+
+	bne = new_bus_entry(bus, &nb->pm_buses);
+	if (!bne) {
+		kfree(nb);
+		status = AE_NO_MEMORY;
+		goto out;
+	}
+
+	list_add_tail(&nb->entry, &pci_acpi_runtime_notifiers);
+
+	status = acpi_install_notify_handler(dev->handle, ACPI_SYSTEM_NOTIFY,
+						pci_acpi_event_fn, nb);
+	if (ACPI_FAILURE(status)) {
+		list_del(&bne->entry);
+		kfree(bne);
+		list_del(&nb->entry);
+		kfree(nb);
+	}
+
+ out:
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return status;
+}
+
+/**
+ * pci_acpi_remove_bus_pm_notifier - Unregister PM notifier for given PCI bus.
+ * @dev: ACPI device to remove the notifier from.
+ * @bus: PCI bus that is walked if an event is signaled.
+ *
+ * Find the notifier object for @dev and remove @bus from its list of buses to
+ * walk when wake-up event is signaled.  If the notifier object is not necessary
+ * any more after that, remove it too.
+ */
+acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev,
+					    struct pci_bus *bus)
+{
+	struct pci_acpi_notifier_block *nb;
+	struct pci_bus_notifier_entry *bne = NULL;
+	acpi_status status = AE_OK;
+
+	mutex_lock(&pci_acpi_notifier_mtx);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+		if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+			continue;
+
+		list_for_each_entry(bne, &nb->pm_buses, entry)
+			if (bne->bus == bus)
+				goto found;
+	}
+
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return AE_NOT_FOUND;
+
+ found:
+	if (bne->enable_count) {
+		nb->pm_enable_count -= bne->enable_count;
+		if (!nb->pm_enable_count)
+			acpi_device_run_wake(nb->dev, false);
+	}
+	list_del(&bne->entry);
+	kfree(bne);
+
+	if (list_empty(&nb->pm_devices) && list_empty(&nb->pm_buses)
+	    && !nb->hp_cb) {
+		status = acpi_remove_notify_handler(nb->dev->handle,
+							ACPI_SYSTEM_NOTIFY,
+							pci_acpi_event_fn);
+		list_del(&nb->entry);
+		kfree(nb);
+	}
+
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return status;
+}
+
+/**
+ * dev_run_wake - Enable/disable the GPE associated with given notifier.
+ * @nb: Notifier to enable/disable the GPE for.
+ * @dne: Device notifier entry for the device being enabled/disabled to wake-up.
+ * @enable: Whether to enable or disable the GPE.
+ */
+static int dev_run_wake(struct pci_acpi_notifier_block *nb,
+			struct pci_dev_notifier_entry *dne, bool enable)
+{
+	int error = 0;
+
+	if (enable) {
+		dne->enabled = true;
+		if (!nb->pm_enable_count++)
+			acpi_device_run_wake(nb->dev, true);
+	} else if (dne->enabled) {
+		dne->enabled = false;
+		if (!--nb->pm_enable_count)
+			acpi_device_run_wake(nb->dev, false);
+	} else {
+		error = -EALREADY;
+	}
+
+	return error;
+}
+
+/**
+ * bus_run_wake - Enable/disable the GPE associated with given notifier.
+ * @nb: Notifier to enable/disable the GPE for.
+ * @bne: Bus notifier entry for a bridge being enabled/disabled to wake-up.
+ * @enable: Whether to enable or disable the GPE.
+ */
+static int bus_run_wake(struct pci_acpi_notifier_block *nb,
+			struct pci_bus_notifier_entry *bne, bool enable)
+{
+	int error = 0;
+
+	if (enable) {
+		bne->enable_count++;
+		if (!nb->pm_enable_count++)
+			acpi_device_run_wake(nb->dev, true);
+	} else if (bne->enable_count) {
+		bne->enable_count--;
+		if (!--nb->pm_enable_count)
+			acpi_device_run_wake(nb->dev, false);
+	} else {
+		error = -EALREADY;
+	}
+
+	return error;
+}
+
+/**
+ * __acpi_dev_run_wake - Enable/disable wake-up for given PCI device.
+ * @pci_dev: Device to enable/disable the platform to wake-up the system for.
+ * @enable: Whether enable or disable the wake-up functionality.
+ *
+ * Find the notifier object corresponding to @pci_dev and try to enable/disable
+ * the GPE associated with it.
+ */
+static int __acpi_dev_run_wake(struct pci_dev *pci_dev, bool enable)
+{
+	struct pci_acpi_notifier_block *nb;
+	struct pci_bus *bus = pci_dev->bus;
+	struct acpi_device *dev;
+	acpi_handle handle;
+	int error = -ENODEV;
+
+	if (!device_can_wakeup(&pci_dev->dev))
+		return -EINVAL;
+
+	handle = DEVICE_ACPI_HANDLE(&pci_dev->dev);
+	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
+		dev_dbg(&pci_dev->dev, "ACPI handle has no context in %s!\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&pci_acpi_notifier_mtx);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+		struct pci_bus_notifier_entry *bne;
+		struct pci_dev_notifier_entry *dne;
+
+		if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+			continue;
+
+		list_for_each_entry(bne, &nb->pm_buses, entry)
+			if (bus_match(bne->bus, bus)) {
+				error = bus_run_wake(nb, bne, enable);
+				goto out;
+			}
+
+		list_for_each_entry(dne, &nb->pm_devices, entry)
+			if (dne->dev == pci_dev) {
+				error = dev_run_wake(nb, dne, enable);
+				goto out;
+			}
+	}
+
+ out:
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return error;
+}
+
+/**
+ * __acpi_bridge_run_wake - Enable/disable wake-up for given bridge.
+ * @bridge: Bridge to enable/disable the platform to wake-up the system for.
+ * @enable: Whether enable or disable the wake-up functionality.
+ *
+ * Find the notifier object corresponding to @bridge and try to enable/disable
+ * the GPE associated with it, under the assumption that @bridge may be a PCI
+ * root bridge.
+ */
+static int __acpi_bridge_run_wake(struct device *bridge, bool enable)
+{
+	struct pci_acpi_notifier_block *nb;
+	struct acpi_device *dev;
+	acpi_handle handle;
+	int error = -ENODEV;
+
+	if (!device_can_wakeup(bridge))
+		return -EINVAL;
+
+	handle = DEVICE_ACPI_HANDLE(bridge);
+	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
+		dev_dbg(bridge, "ACPI handle has no context in %s!\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&pci_acpi_notifier_mtx);
+
+	list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+		struct pci_bus_notifier_entry *bne;
+
+		if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+			continue;
+
+		list_for_each_entry(bne, &nb->pm_buses, entry)
+			if (bne->bus->bridge == bridge) {
+				error = bus_run_wake(nb, bne, enable);
+				goto out;
+			}
+	}
+
+ out:
+	mutex_unlock(&pci_acpi_notifier_mtx);
+	return error;
+}
+
+/*
  * _SxD returns the D-state with the highest power
  * (lowest D-state number) supported in the S-state "x".
  *
@@ -137,12 +813,42 @@  static int acpi_pci_sleep_wake(struct pc
 	return 0;
 }
 
+static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
+{
+	while (bus->parent) {
+		struct pci_dev *bridge = bus->self;
+
+		if (pcie_pme_enabled(bridge))
+			return;
+		if (!__acpi_dev_run_wake(bridge, enable))
+			return;
+		bus = bus->parent;
+	}
+
+	/* We have reached the root bus. */
+	if (bus->bridge)
+		__acpi_bridge_run_wake(bus->bridge, enable);
+}
+
+static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
+{
+	if (pcie_pme_enabled(dev))
+		return 0;
+
+	if (acpi_pci_can_wakeup(dev))
+		return __acpi_dev_run_wake(dev, enable);
+
+	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"
 
@@ -434,6 +435,12 @@  static inline int platform_pci_sleep_wak
 			pci_platform_pm->sleep_wake(dev, enable) : -ENODEV;
 }
 
+int pci_platform_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
@@ -1202,6 +1209,31 @@  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.
+ */
+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#.
Index: linux-2.6/drivers/acpi/wakeup.c
===================================================================
--- linux-2.6.orig/drivers/acpi/wakeup.c
+++ linux-2.6/drivers/acpi/wakeup.c
@@ -124,6 +124,56 @@  void acpi_disable_wakeup_device(u8 sleep
 	}
 }
 
+#ifdef CONFIG_PM_WAKEUP
+/**
+ * acpi_device_run_wake - Enable/disable ACPI BIOS to generate wake-up events.
+ * @dev: Device to generate the wake-up events for.
+ * @enable: Desired action.
+ *
+ * If @enable is set, set up the GPE associated with @phys_dev to generate
+ * wake-up events at run time.  If @enable is unset, disable the GPE associated
+ * with @phys_dev (unless it is marked as a run-wake device).
+ */
+int acpi_device_run_wake(struct acpi_device *dev, bool enable)
+{
+	if (!dev || !dev->wakeup.flags.valid)
+		return -EINVAL;
+
+	if (enable) {
+		if (!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
+			return -EINVAL;
+
+		acpi_set_gpe_type(dev->wakeup.gpe_device,
+					dev->wakeup.gpe_number,
+					ACPI_GPE_TYPE_WAKE_RUN);
+		acpi_enable_gpe(dev->wakeup.gpe_device,
+					dev->wakeup.gpe_number);
+	} else if (!dev->wakeup.flags.run_wake) {
+		acpi_set_gpe_type(dev->wakeup.gpe_device,
+					dev->wakeup.gpe_number,
+					ACPI_GPE_TYPE_WAKE);
+		acpi_disable_gpe(dev->wakeup.gpe_device,
+					dev->wakeup.gpe_number);
+		acpi_clear_gpe(dev->wakeup.gpe_device,
+					dev->wakeup.gpe_number, ACPI_NOT_ISR);
+	}
+
+	return 0;
+}
+
+/**
+ * acpi_wakeup_gpes_shared - Check if given ACPI devices share a wake-up GPE.
+ * @deva: First ACPI device to check.
+ * @devb: Second ACPI device to check.
+ */
+bool acpi_wakeup_gpe_shared(struct acpi_device *deva, struct acpi_device *devb)
+{
+	return deva->wakeup.flags.valid && devb->wakeup.flags.valid
+		&& deva->wakeup.gpe_device == devb->wakeup.gpe_device
+		&& deva->wakeup.gpe_number == devb->wakeup.gpe_number;
+}
+#endif /* CONFIG_PM_WAKEUP */
+
 int __init acpi_wakeup_device_init(void)
 {
 	struct list_head *node, *next;
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
@@ -386,21 +386,35 @@  acpi_handle acpi_get_pci_rootbridge_hand
 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
 #define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)((dev)->archdata.acpi_handle))
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM_WAKEUP
 int acpi_pm_device_sleep_state(struct device *, int *);
 int acpi_pm_device_sleep_wake(struct device *, bool);
-#else /* !CONFIG_PM_SLEEP */
+int acpi_device_run_wake(struct acpi_device *, bool);
+bool acpi_wakeup_gpe_shared(struct acpi_device *, struct acpi_device *);
+#else /* !CONFIG_PM_WAKEUP */
 static inline int acpi_pm_device_sleep_state(struct device *d, int *p)
 {
 	if (p)
 		*p = ACPI_STATE_D0;
 	return ACPI_STATE_D3;
 }
+
 static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 {
 	return -ENODEV;
 }
-#endif /* !CONFIG_PM_SLEEP */
+
+static inline int acpi_device_run_wake(struct device *dev, bool enable)
+{
+	return -ENODEV;
+}
+
+static inline bool acpi_wakeup_gpe_shared(struct acpi_device *a,
+					   struct acpi_device *b)
+{
+	return false;
+}
+#endif /* !CONFIG_PM_WAKEUP */
 
 #endif				/* CONFIG_ACPI */
 
Index: linux-2.6/kernel/power/Kconfig
===================================================================
--- linux-2.6.orig/kernel/power/Kconfig
+++ linux-2.6/kernel/power/Kconfig
@@ -236,3 +236,8 @@  config PM_RUNTIME
 	  and the bus type drivers of the buses the devices are on are
 	  responsible for the actual handling of the autosuspend requests and
 	  wake-up events.
+
+config PM_WAKEUP
+	bool
+	depends on SUSPEND || HIBERNATION || PM_RUNTIME
+	default y
Index: linux-2.6/drivers/acpi/sleep.c
===================================================================
--- linux-2.6.orig/drivers/acpi/sleep.c
+++ linux-2.6/drivers/acpi/sleep.c
@@ -602,7 +602,7 @@  int acpi_suspend(u32 acpi_state)
 	return -EINVAL;
 }
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM_WAKEUP
 /**
  *	acpi_pm_device_sleep_state - return preferred power state of ACPI device
  *		in the system sleep state given by %acpi_target_sleep_state
@@ -717,7 +717,7 @@  int acpi_pm_device_sleep_wake(struct dev
 
 	return error;
 }
-#endif
+#endif /* CONFIG_PM_WAKEUP */
 
 static void acpi_power_off_prepare(void)
 {
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
@@ -577,6 +577,9 @@  static int __devinit acpi_pci_root_add(s
 	if (flags != base_flags)
 		acpi_pci_osc_support(root, flags);
 
+	if (device->wakeup.flags.valid)
+		pci_acpi_add_bus_pm_notifier(device, root->bus);
+
 	return 0;
 
 end:
@@ -598,6 +601,8 @@  static int acpi_pci_root_remove(struct a
 {
 	struct acpi_pci_root *root = acpi_driver_data(device);
 
+	if (device->wakeup.flags.valid)
+		pci_acpi_remove_bus_pm_notifier(device, root->bus);
 	kfree(root);
 	return 0;
 }
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 +11,20 @@ 
 #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_device_pm_notifier(struct acpi_device *dev,
+						   struct pci_dev *pci_dev);
+extern acpi_status pci_acpi_remove_device_pm_notifier(struct acpi_device *dev,
+						      struct pci_dev *pci_dev);
+extern acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
+						struct pci_bus *bus);
+extern acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev,
+						   struct pci_bus *bus);
+
 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
@@ -26,6 +26,7 @@ 
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/pci.h>
+#include <linux/pci-acpi.h>
 #include <linux/acpi.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
@@ -38,7 +39,17 @@  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;
+
+	if (device->wakeup.flags.valid) {
+		if (dev->subordinate)
+			pci_acpi_remove_bus_pm_notifier(device,
+							dev->subordinate);
+		pci_acpi_remove_device_pm_notifier(device, dev);
+	}
+
+	if (!dev->subordinate)
 		goto out;
 
 	acpi_pci_irq_del_prt(dev->subordinate);
@@ -94,6 +105,12 @@  static int acpi_pci_bind(struct acpi_dev
 
 	acpi_pci_irq_add_prt(device->handle, bus);
 
+	if (device->wakeup.flags.valid) {
+		pci_acpi_add_device_pm_notifier(device, dev);
+		if (dev->subordinate)
+			pci_acpi_add_bus_pm_notifier(device, dev->subordinate);
+	}
+
 out:
 	pci_dev_put(dev);
 	return 0;
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
@@ -238,8 +238,7 @@  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);
 
@@ -290,14 +289,12 @@  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);
 
@@ -513,15 +510,14 @@  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))
@@ -539,8 +535,7 @@  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");
@@ -602,7 +597,7 @@  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);
 }
 
@@ -1492,8 +1487,8 @@  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 ;