diff options
Diffstat (limited to 'drivers/base/power/qos.c')
| -rw-r--r-- | drivers/base/power/qos.c | 124 |
1 files changed, 98 insertions, 26 deletions
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 96d27b821bb8..3c66f75d14b0 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -48,6 +48,50 @@ static DEFINE_MUTEX(dev_pm_qos_mtx); static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers); /** + * __dev_pm_qos_flags - Check PM QoS flags for a given device. + * @dev: Device to check the PM QoS flags for. + * @mask: Flags to check against. + * + * This routine must be called with dev->power.lock held. + */ +enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask) +{ + struct dev_pm_qos *qos = dev->power.qos; + struct pm_qos_flags *pqf; + s32 val; + + if (!qos) + return PM_QOS_FLAGS_UNDEFINED; + + pqf = &qos->flags; + if (list_empty(&pqf->list)) + return PM_QOS_FLAGS_UNDEFINED; + + val = pqf->effective_flags & mask; + if (val) + return (val == mask) ? PM_QOS_FLAGS_ALL : PM_QOS_FLAGS_SOME; + + return PM_QOS_FLAGS_NONE; +} + +/** + * dev_pm_qos_flags - Check PM QoS flags for a given device (locked). + * @dev: Device to check the PM QoS flags for. + * @mask: Flags to check against. + */ +enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask) +{ + unsigned long irqflags; + enum pm_qos_flags_status ret; + + spin_lock_irqsave(&dev->power.lock, irqflags); + ret = __dev_pm_qos_flags(dev, mask); + spin_unlock_irqrestore(&dev->power.lock, irqflags); + + return ret; +} + +/** * __dev_pm_qos_read_value - Get PM QoS constraint for a given device. * @dev: Device to get the PM QoS constraint value for. * @@ -74,30 +118,39 @@ s32 dev_pm_qos_read_value(struct device *dev) return ret; } -/* - * apply_constraint - * @req: constraint request to apply - * @action: action to perform add/update/remove, of type enum pm_qos_req_action - * @value: defines the qos request +/** + * apply_constraint - Add/modify/remove device PM QoS request. + * @req: Constraint request to apply + * @action: Action to perform (add/update/remove). + * @value: Value to assign to the QoS request. * * Internal function to update the constraints list using the PM QoS core * code and if needed call the per-device and the global notification * callbacks */ static int apply_constraint(struct dev_pm_qos_request *req, - enum pm_qos_req_action action, int value) + enum pm_qos_req_action action, s32 value) { - int ret, curr_value; - - ret = pm_qos_update_target(&req->dev->power.qos->latency, - &req->data.pnode, action, value); + struct dev_pm_qos *qos = req->dev->power.qos; + int ret; - if (ret) { - /* Call the global callbacks if needed */ - curr_value = pm_qos_read_value(&req->dev->power.qos->latency); - blocking_notifier_call_chain(&dev_pm_notifiers, - (unsigned long)curr_value, - req); + switch(req->type) { + case DEV_PM_QOS_LATENCY: + ret = pm_qos_update_target(&qos->latency, &req->data.pnode, + action, value); + if (ret) { + value = pm_qos_read_value(&qos->latency); + blocking_notifier_call_chain(&dev_pm_notifiers, + (unsigned long)value, + req); + } + break; + case DEV_PM_QOS_FLAGS: + ret = pm_qos_update_flags(&qos->flags, &req->data.flr, + action, value); + break; + default: + ret = -EINVAL; } return ret; @@ -134,6 +187,8 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) c->type = PM_QOS_MIN; c->notifiers = n; + INIT_LIST_HEAD(&qos->flags.list); + spin_lock_irq(&dev->power.lock); dev->power.qos = qos; spin_unlock_irq(&dev->power.lock); @@ -207,6 +262,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev) * dev_pm_qos_add_request - inserts new qos request into the list * @dev: target device for the constraint * @req: pointer to a preallocated handle + * @type: type of the request * @value: defines the qos request * * This function inserts a new entry in the device constraints list of @@ -222,7 +278,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev) * from the system. */ int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req, - s32 value) + enum dev_pm_qos_req_type type, s32 value) { int ret = 0; @@ -253,8 +309,10 @@ int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req, } } - if (!ret) + if (!ret) { + req->type = type; ret = apply_constraint(req, PM_QOS_ADD_REQ, value); + } out: mutex_unlock(&dev_pm_qos_mtx); @@ -281,6 +339,7 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_add_request); int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value) { + s32 curr_value; int ret = 0; if (!req) /*guard against callers passing in null */ @@ -292,15 +351,27 @@ int dev_pm_qos_update_request(struct dev_pm_qos_request *req, mutex_lock(&dev_pm_qos_mtx); - if (req->dev->power.qos) { - if (new_value != req->data.pnode.prio) - ret = apply_constraint(req, PM_QOS_UPDATE_REQ, - new_value); - } else { - /* Return if the device has been removed */ + if (!req->dev->power.qos) { ret = -ENODEV; + goto out; } + switch(req->type) { + case DEV_PM_QOS_LATENCY: + curr_value = req->data.pnode.prio; + break; + case DEV_PM_QOS_FLAGS: + curr_value = req->data.flr.flags; + break; + default: + ret = -EINVAL; + goto out; + } + + if (curr_value != new_value) + ret = apply_constraint(req, PM_QOS_UPDATE_REQ, new_value); + + out: mutex_unlock(&dev_pm_qos_mtx); return ret; } @@ -451,7 +522,8 @@ int dev_pm_qos_add_ancestor_request(struct device *dev, ancestor = ancestor->parent; if (ancestor) - error = dev_pm_qos_add_request(ancestor, req, value); + error = dev_pm_qos_add_request(ancestor, req, + DEV_PM_QOS_LATENCY, value); if (error) req->dev = NULL; @@ -487,7 +559,7 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) if (!req) return -ENOMEM; - ret = dev_pm_qos_add_request(dev, req, value); + ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY, value); if (ret < 0) return ret; |