These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / base / power / qos.c

diff --git a/kernel/drivers/base/power/qos.c b/kernel/drivers/base/power/qos.c
index e56d538..7f3646e 100644 (file)
--- a/kernel/drivers/base/power/qos.c
+++ b/kernel/drivers/base/power/qos.c
@@ -883,3 +883,40 @@ int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
        mutex_unlock(&dev_pm_qos_mtx);
        return ret;
 }
+
+/**
+ * dev_pm_qos_expose_latency_tolerance - Expose latency tolerance to userspace
+ * @dev: Device whose latency tolerance to expose
+ */
+int dev_pm_qos_expose_latency_tolerance(struct device *dev)
+{
+       int ret;
+
+       if (!dev->power.set_latency_tolerance)
+               return -EINVAL;
+
+       mutex_lock(&dev_pm_qos_sysfs_mtx);
+       ret = pm_qos_sysfs_add_latency_tolerance(dev);
+       mutex_unlock(&dev_pm_qos_sysfs_mtx);
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_tolerance);
+
+/**
+ * dev_pm_qos_hide_latency_tolerance - Hide latency tolerance from userspace
+ * @dev: Device whose latency tolerance to hide
+ */
+void dev_pm_qos_hide_latency_tolerance(struct device *dev)
+{
+       mutex_lock(&dev_pm_qos_sysfs_mtx);
+       pm_qos_sysfs_remove_latency_tolerance(dev);
+       mutex_unlock(&dev_pm_qos_sysfs_mtx);
+
+       /* Remove the request from user space now */
+       pm_runtime_get_sync(dev);
+       dev_pm_qos_update_user_latency_tolerance(dev,
+               PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT);
+       pm_runtime_put(dev);
+}
+EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_tolerance);