#include <acpi/acpi_bus.h>
#include <linux/pci-acpi.h>
+#include <linux/pm_runtime.h>
#include "pci.h"
-struct acpi_osc_data {
- acpi_handle handle;
- u32 support_set;
- u32 control_set;
- u32 control_query;
- int is_queried;
- struct list_head sibiling;
-};
-static LIST_HEAD(acpi_osc_data_list);
-
-struct acpi_osc_args {
- u32 capbuf[3];
-};
+static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
-static DEFINE_MUTEX(pci_acpi_lock);
-
-static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
+/**
+ * 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 acpi_osc_data *data;
+ struct pci_bus *pci_bus = context;
- list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
- if (data->handle == handle)
- return data;
- }
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return NULL;
- INIT_LIST_HEAD(&data->sibiling);
- data->handle = handle;
- list_add_tail(&data->sibiling, &acpi_osc_data_list);
- return data;
+ if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
+ pci_pme_wakeup_bus(pci_bus);
}
-static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
- 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
-
-static acpi_status acpi_run_osc(acpi_handle handle,
- struct acpi_osc_args *osc_args, u32 *retval)
+/**
+ * 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)
{
- acpi_status status;
- struct acpi_object_list input;
- union acpi_object in_params[4];
- struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
- union acpi_object *out_obj;
- u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
-
- /* Setting up input parameters */
- input.count = 4;
- input.pointer = in_params;
- in_params[0].type = ACPI_TYPE_BUFFER;
- in_params[0].buffer.length = 16;
- in_params[0].buffer.pointer = OSC_UUID;
- in_params[1].type = ACPI_TYPE_INTEGER;
- in_params[1].integer.value = 1;
- in_params[2].type = ACPI_TYPE_INTEGER;
- in_params[2].integer.value = 3;
- in_params[3].type = ACPI_TYPE_BUFFER;
- in_params[3].buffer.length = 12;
- in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
-
- status = acpi_evaluate_object(handle, "_OSC", &input, &output);
- if (ACPI_FAILURE(status))
- return status;
-
- if (!output.length)
- return AE_NULL_OBJECT;
+ struct pci_dev *pci_dev = context;
- out_obj = output.pointer;
- if (out_obj->type != ACPI_TYPE_BUFFER) {
- printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
- status = AE_TYPE;
- goto out_kfree;
+ 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);
}
- /* Need to ignore the bit0 in result code */
- errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
- if (errors) {
- if (errors & OSC_REQUEST_ERROR)
- printk(KERN_DEBUG "_OSC request fails\n");
- if (errors & OSC_INVALID_UUID_ERROR)
- printk(KERN_DEBUG "_OSC invalid UUID\n");
- if (errors & OSC_INVALID_REVISION_ERROR)
- printk(KERN_DEBUG "_OSC invalid revision\n");
- if (errors & OSC_CAPABILITIES_MASK_ERROR) {
- if (flags & OSC_QUERY_ENABLE)
- goto out_success;
- printk(KERN_DEBUG "_OSC FW not grant req. control\n");
- status = AE_SUPPORT;
- goto out_kfree;
- }
- status = AE_ERROR;
- goto out_kfree;
- }
-out_success:
- *retval = *((u32 *)(out_obj->buffer.pointer + 8));
- status = AE_OK;
-
-out_kfree:
- kfree(output.pointer);
- return status;
}
-static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
-{
- acpi_status status;
- u32 support_set, result;
- struct acpi_osc_args osc_args;
-
- /* do _OSC query for all possible controls */
- support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
- osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
- osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
- osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
-
- status = acpi_run_osc(osc_data->handle, &osc_args, &result);
- if (ACPI_SUCCESS(status)) {
- osc_data->support_set = support_set;
- osc_data->control_query = result;
- osc_data->is_queried = 1;
- }
-
- return status;
-}
-
-/*
- * pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
- * @flags: Bitmask of flags to support
+/**
+ * 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.
*
- * See the ACPI spec for the definition of the flags
+ * 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.
*/
-int pci_acpi_osc_support(acpi_handle handle, u32 flags)
+static acpi_status add_pm_notifier(struct acpi_device *dev,
+ acpi_notify_handler handler,
+ void *context)
{
- acpi_status status;
- acpi_handle tmp;
- struct acpi_osc_data *osc_data;
- int rc = 0;
+ acpi_status status = AE_ALREADY_EXISTS;
- status = acpi_get_handle(handle, "_OSC", &tmp);
- if (ACPI_FAILURE(status))
- return -ENOTTY;
+ mutex_lock(&pci_acpi_pm_notify_mtx);
- mutex_lock(&pci_acpi_lock);
- osc_data = acpi_get_osc_data(handle);
- if (!osc_data) {
- printk(KERN_ERR "acpi osc data array is full\n");
- rc = -ENOMEM;
+ if (dev->wakeup.flags.notifier_present)
goto out;
- }
- __acpi_query_osc(flags, osc_data);
-out:
- mutex_unlock(&pci_acpi_lock);
- return rc;
+ 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;
}
/**
- * pci_osc_control_set - commit requested control to Firmware
- * @handle: acpi_handle for the target ACPI object
- * @flags: driver's requested control bits
- *
- * Attempt to take control from Firmware on requested control bits.
- **/
-acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
+ * 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;
- u32 control_req, control_set, result;
- acpi_handle tmp;
- struct acpi_osc_data *osc_data;
- struct acpi_osc_args osc_args;
+ acpi_status status = AE_BAD_PARAMETER;
- status = acpi_get_handle(handle, "_OSC", &tmp);
- if (ACPI_FAILURE(status))
- return status;
+ mutex_lock(&pci_acpi_pm_notify_mtx);
- mutex_lock(&pci_acpi_lock);
- osc_data = acpi_get_osc_data(handle);
- if (!osc_data) {
- printk(KERN_ERR "acpi osc data array is full\n");
- status = AE_ERROR;
+ if (!dev->wakeup.flags.notifier_present)
goto out;
- }
- control_req = (flags & OSC_CONTROL_MASKS);
- if (!control_req) {
- status = AE_TYPE;
+ status = acpi_remove_notify_handler(dev->handle,
+ ACPI_SYSTEM_NOTIFY,
+ handler);
+ if (ACPI_FAILURE(status))
goto out;
- }
- /* No need to evaluate _OSC if the control was already granted. */
- if ((osc_data->control_set & control_req) == control_req)
- goto out;
+ dev->wakeup.flags.notifier_present = false;
- if (!osc_data->is_queried) {
- status = __acpi_query_osc(osc_data->support_set, osc_data);
- if (ACPI_FAILURE(status))
- goto out;
- }
+ out:
+ mutex_unlock(&pci_acpi_pm_notify_mtx);
+ return status;
+}
- if ((osc_data->control_query & control_req) != control_req) {
- status = AE_SUPPORT;
- goto out;
- }
+/**
+ * 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);
+}
- control_set = osc_data->control_set | control_req;
- osc_args.capbuf[OSC_QUERY_TYPE] = 0;
- osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
- osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
- status = acpi_run_osc(handle, &osc_args, &result);
- if (ACPI_SUCCESS(status))
- osc_data->control_set = result;
-out:
- mutex_unlock(&pci_acpi_lock);
- return status;
+/**
+ * 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);
}
-EXPORT_SYMBOL(pci_osc_control_set);
/*
* _SxD returns the D-state with the highest power
return handle ? acpi_bus_can_wakeup(handle) : false;
}
+static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
+{
+ while (bus->parent) {
+ if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
+ return;
+ bus = bus->parent;
+ }
+
+ /* We have reached the root bus. */
+ if (bus->bridge)
+ acpi_pm_device_sleep_wake(bus->bridge, enable);
+}
+
static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
{
- int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
+ if (acpi_pci_can_wakeup(dev))
+ return acpi_pm_device_sleep_wake(&dev->dev, enable);
+
+ acpi_pci_propagate_wakeup_enable(dev->bus, 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;
+ }
- if (!error)
- dev_printk(KERN_INFO, &dev->dev,
- "wake-up capability %s by ACPI\n",
- enable ? "enabled" : "disabled");
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 */