Commit c4772d19 authored by MyungJoo Ham's avatar MyungJoo Ham Committed by Rafael J. Wysocki
Browse files

PM / QoS: add pm_qos_update_request_timeout() API 



The new API, pm_qos_update_request_timeout() is to provide a timeout
with pm_qos_update_request.

For example, pm_qos_update_request_timeout(req, 100, 1000), means that
QoS request on req with value 100 will be active for 1000 microseconds.
After 1000 microseconds, the QoS request thru req is reset. If there
were another pm_qos_update_request(req, x) during the 1000 us, this
new request with value x will override as this is another request on the
same req handle. A new request on the same req handle will always
override the previous request whether it is the conventional request or
it is the new timeout request.

Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Acked-by: default avatarMark Gross <markgross@thegnar.org>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent a36cf844

include/linux/pm_qos.h

+4 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/notifier.h>

#include <linux/miscdevice.h>

#include <linux/device.h>

#include <linux/workqueue.h>



enum {

	PM_QOS_RESERVED = 0,
@@ -29,6 +30,7 @@ enum { 
struct pm_qos_request {

	struct plist_node node;

	int pm_qos_class;

	struct delayed_work work; /* for pm_qos_update_request_timeout */

};



struct dev_pm_qos_request {
@@ -73,6 +75,8 @@ void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class, 
			s32 value);

void pm_qos_update_request(struct pm_qos_request *req,

			   s32 new_value);

void pm_qos_update_request_timeout(struct pm_qos_request *req,

				   s32 new_value, unsigned long timeout_us);

void pm_qos_remove_request(struct pm_qos_request *req);



int pm_qos_request(int pm_qos_class);

kernel/power/qos.c

+50 −0
Original line number Diff line number Diff line
@@ -229,6 +229,21 @@ int pm_qos_request_active(struct pm_qos_request *req) 
}

EXPORT_SYMBOL_GPL(pm_qos_request_active);



/**

 * pm_qos_work_fn - the timeout handler of pm_qos_update_request_timeout

 * @work: work struct for the delayed work (timeout)

 *

 * This cancels the timeout request by falling back to the default at timeout.

 */

static void pm_qos_work_fn(struct work_struct *work)

{

	struct pm_qos_request *req = container_of(to_delayed_work(work),

						  struct pm_qos_request,

						  work);



	pm_qos_update_request(req, PM_QOS_DEFAULT_VALUE);

}



/**

 * pm_qos_add_request - inserts new qos request into the list

 * @req: pointer to a preallocated handle
@@ -253,6 +268,7 @@ void pm_qos_add_request(struct pm_qos_request *req, 
		return;

	}

	req->pm_qos_class = pm_qos_class;

	INIT_DELAYED_WORK(&req->work, pm_qos_work_fn);

	pm_qos_update_target(pm_qos_array[pm_qos_class]->constraints,

			     &req->node, PM_QOS_ADD_REQ, value);

}
@@ -279,6 +295,9 @@ void pm_qos_update_request(struct pm_qos_request *req, 
		return;

	}



	if (delayed_work_pending(&req->work))

		cancel_delayed_work_sync(&req->work);



	if (new_value != req->node.prio)

		pm_qos_update_target(

			pm_qos_array[req->pm_qos_class]->constraints,
@@ -286,6 +305,34 @@ void pm_qos_update_request(struct pm_qos_request *req, 
}

EXPORT_SYMBOL_GPL(pm_qos_update_request);



/**

 * pm_qos_update_request_timeout - modifies an existing qos request temporarily.

 * @req : handle to list element holding a pm_qos request to use

 * @new_value: defines the temporal qos request

 * @timeout_us: the effective duration of this qos request in usecs.

 *

 * After timeout_us, this qos request is cancelled automatically.

 */

void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value,

				   unsigned long timeout_us)

{

	if (!req)

		return;

	if (WARN(!pm_qos_request_active(req),

		 "%s called for unknown object.", __func__))

		return;



	if (delayed_work_pending(&req->work))

		cancel_delayed_work_sync(&req->work);



	if (new_value != req->node.prio)

		pm_qos_update_target(

			pm_qos_array[req->pm_qos_class]->constraints,

			&req->node, PM_QOS_UPDATE_REQ, new_value);



	schedule_delayed_work(&req->work, usecs_to_jiffies(timeout_us));

}



/**

 * pm_qos_remove_request - modifies an existing qos request

 * @req: handle to request list element
@@ -305,6 +352,9 @@ void pm_qos_remove_request(struct pm_qos_request *req) 
		return;

	}



	if (delayed_work_pending(&req->work))

		cancel_delayed_work_sync(&req->work);



	pm_qos_update_target(pm_qos_array[req->pm_qos_class]->constraints,

			     &req->node, PM_QOS_REMOVE_REQ,

			     PM_QOS_DEFAULT_VALUE);

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