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authorRafael J. Wysocki <rjw@sisk.pl>2010-02-17 23:44:09 +0100
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-02-22 16:21:02 -0800
commitb67ea76172d4b1922c4b3c46c8ea8e9fec1ff38c (patch)
treec2f51811376060b3b59ac43243a182b94a48be9b /drivers/pci/pci-acpi.c
parent3f0be67188c60ebf1b5d00354b44b4b24f5af313 (diff)
PCI / ACPI / PM: Platform support for PCI PME wake-up
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, PME signals 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. The devices without dedicated GPEs have to rely on the GPEs associated with other devices (in the majority of cases their upstream bridges and, possibly, the root bridge) to generate ACPI wake-up events in response to PME signals from them. Add ACPI platform support for PCI PME wake-up: o Add a framework making is possible to use ACPI system notify handlers for run-time PM. 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 root buses and make the PCI-ACPI binding code register wake-up notifiers for all PCI devices present in the ACPI tables. 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> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r--drivers/pci/pci-acpi.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 7e2829538a4..c0c73913833 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -16,8 +16,144 @@
#include <acpi/acpi_bus.h>
#include <linux/pci-acpi.h>
+#include <linux/pm_runtime.h>
#include "pci.h"
+static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
+
+/**
+ * pci_acpi_wake_bus - Wake-up notification handler for root buses.
+ * @handle: ACPI handle of a device the notification is for.
+ * @event: Type of the signaled event.
+ * @context: PCI root bus to wake up devices on.
+ */
+static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context)
+{
+ struct pci_bus *pci_bus = context;
+
+ if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
+ pci_pme_wakeup_bus(pci_bus);
+}
+
+/**
+ * pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
+ * @handle: ACPI handle of a device the notification is for.
+ * @event: Type of the signaled event.
+ * @context: PCI device object to wake up.
+ */
+static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
+{
+ struct pci_dev *pci_dev = context;
+
+ if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_dev) {
+ pci_check_pme_status(pci_dev);
+ pm_runtime_resume(&pci_dev->dev);
+ if (pci_dev->subordinate)
+ pci_pme_wakeup_bus(pci_dev->subordinate);
+ }
+}
+
+/**
+ * add_pm_notifier - Register PM notifier for given ACPI device.
+ * @dev: ACPI device to add the notifier for.
+ * @context: PCI device or bus to check for PME status if an event is signaled.
+ *
+ * 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.
+ */
+static acpi_status add_pm_notifier(struct acpi_device *dev,
+ acpi_notify_handler handler,
+ void *context)
+{
+ acpi_status status = AE_ALREADY_EXISTS;
+
+ mutex_lock(&pci_acpi_pm_notify_mtx);
+
+ if (dev->wakeup.flags.notifier_present)
+ goto out;
+
+ status = acpi_install_notify_handler(dev->handle,
+ ACPI_SYSTEM_NOTIFY,
+ handler, context);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+ dev->wakeup.flags.notifier_present = true;
+
+ out:
+ mutex_unlock(&pci_acpi_pm_notify_mtx);
+ return status;
+}
+
+/**
+ * remove_pm_notifier - Unregister PM notifier from given ACPI device.
+ * @dev: ACPI device to remove the notifier from.
+ */
+static acpi_status remove_pm_notifier(struct acpi_device *dev,
+ acpi_notify_handler handler)
+{
+ acpi_status status = AE_BAD_PARAMETER;
+
+ mutex_lock(&pci_acpi_pm_notify_mtx);
+
+ if (!dev->wakeup.flags.notifier_present)
+ goto out;
+
+ status = acpi_remove_notify_handler(dev->handle,
+ ACPI_SYSTEM_NOTIFY,
+ handler);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+ dev->wakeup.flags.notifier_present = false;
+
+ out:
+ mutex_unlock(&pci_acpi_pm_notify_mtx);
+ return status;
+}
+
+/**
+ * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
+ * @dev: ACPI device to add the notifier for.
+ * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
+ */
+acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
+ struct pci_bus *pci_bus)
+{
+ return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
+}
+
+/**
+ * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
+ * @dev: ACPI device to remove the notifier from.
+ */
+acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
+{
+ return remove_pm_notifier(dev, pci_acpi_wake_bus);
+}
+
+/**
+ * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
+ * @dev: ACPI device to add the notifier for.
+ * @pci_dev: PCI device to check for the PME status if an event is signaled.
+ */
+acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev)
+{
+ return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
+}
+
+/**
+ * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
+ * @dev: ACPI device to remove the notifier from.
+ */
+acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
+{
+ return remove_pm_notifier(dev, pci_acpi_wake_dev);
+}
+
/*
* _SxD returns the D-state with the highest power
* (lowest D-state number) supported in the S-state "x".
@@ -131,12 +267,87 @@ static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
return 0;
}
+/**
+ * acpi_dev_run_wake - 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(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_enable_wakeup_device_power(dev, ACPI_STATE_S0);
+ acpi_enable_gpe(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number,
+ ACPI_GPE_TYPE_RUNTIME);
+ }
+ } else if (dev->wakeup.run_wake_count > 0) {
+ if (!--dev->wakeup.run_wake_count) {
+ acpi_disable_gpe(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number,
+ ACPI_GPE_TYPE_RUNTIME);
+ acpi_disable_wakeup_device_power(dev);
+ }
+ } 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(&bridge->dev, enable))
+ return;
+ bus = bus->parent;
+ }
+
+ /* We have reached the root bus. */
+ if (bus->bridge)
+ acpi_dev_run_wake(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(&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 */