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PM / QOS: Pass request type to dev_pm_qos_{add|remove}_notifier() 

In order to use the same set of routines to register notifiers for
different request types, update the existing
dev_pm_qos_{add|remove}_notifier() routines with an additional
parameter: request-type.

For now, it only supports resume-latency request type but will be
extended to frequency limit (min/max) constraints later on.

Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2019-07-04 13:06:17 +05:30 committed by Rafael J. Wysocki
parent 70a59fde6e
commit 0b07ee9447
4 changed files with 32 additions and 14 deletions
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12
Documentation/power/pm_qos_interface.txt
View File

@ -164,12 +164,14 @@ directory.
Notification mechanisms:
The per-device PM QoS framework has a per-device notification tree.
int dev_pm_qos_add_notifier(device, notifier):
Adds a notification callback function for the device.
The callback is called when the aggregated value of the device constraints list
is changed (for resume latency device PM QoS only).
int dev_pm_qos_add_notifier(device, notifier, type):
Adds a notification callback function for the device for a particular request
type.
int dev_pm_qos_remove_notifier(device, notifier):
The callback is called when the aggregated value of the device constraints list
is changed.
int dev_pm_qos_remove_notifier(device, notifier, type):
Removes the notification callback function for the device.

8
drivers/base/power/domain.c
View File

@ -1536,7 +1536,8 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
if (ret)
genpd_free_dev_data(dev, gpd_data);
else
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
dev_pm_qos_add_notifier(dev, &gpd_data->nb,
DEV_PM_QOS_RESUME_LATENCY);
return ret;
}
@ -1569,7 +1570,8 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
pdd = dev->power.subsys_data->domain_data;
gpd_data = to_gpd_data(pdd);
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
dev_pm_qos_remove_notifier(dev, &gpd_data->nb,
DEV_PM_QOS_RESUME_LATENCY);
genpd_lock(genpd);
@ -1597,7 +1599,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
out:
genpd_unlock(genpd);
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY);
return ret;
}

14
drivers/base/power/qos.c
View File

@ -467,6 +467,7 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_remove_request);
*
* @dev: target device for the constraint
* @notifier: notifier block managed by caller.
* @type: request type.
*
* Will register the notifier into a notification chain that gets called
* upon changes to the target value for the device.
@ -474,10 +475,14 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_remove_request);
* If the device's constraints object doesn't exist when this routine is called,
* it will be created (or error code will be returned if that fails).
*/
int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier)
int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier,
enum dev_pm_qos_req_type type)
{
int ret = 0;
if (WARN_ON(type != DEV_PM_QOS_RESUME_LATENCY))
return -EINVAL;
mutex_lock(&dev_pm_qos_mtx);
if (IS_ERR(dev->power.qos))
@ -500,15 +505,20 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_add_notifier);
*
* @dev: target device for the constraint
* @notifier: notifier block to be removed.
* @type: request type.
*
* Will remove the notifier from the notification chain that gets called
* upon changes to the target value.
*/
int dev_pm_qos_remove_notifier(struct device *dev,
struct notifier_block *notifier)
struct notifier_block *notifier,
enum dev_pm_qos_req_type type)
{
int retval = 0;
if (WARN_ON(type != DEV_PM_QOS_RESUME_LATENCY))
return -EINVAL;
mutex_lock(&dev_pm_qos_mtx);
/* Silently return if the constraints object is not present. */

12
include/linux/pm_qos.h
View File

@ -146,9 +146,11 @@ int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
int dev_pm_qos_add_notifier(struct device *dev,
struct notifier_block *notifier);
struct notifier_block *notifier,
enum dev_pm_qos_req_type type);
int dev_pm_qos_remove_notifier(struct device *dev,
struct notifier_block *notifier);
struct notifier_block *notifier,
enum dev_pm_qos_req_type type);
void dev_pm_qos_constraints_init(struct device *dev);
void dev_pm_qos_constraints_destroy(struct device *dev);
int dev_pm_qos_add_ancestor_request(struct device *dev,
@ -202,10 +204,12 @@ static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
{ return 0; }
static inline int dev_pm_qos_add_notifier(struct device *dev,
struct notifier_block *notifier)
struct notifier_block *notifier,
enum dev_pm_qos_req_type type)
{ return 0; }
static inline int dev_pm_qos_remove_notifier(struct device *dev,
struct notifier_block *notifier)
struct notifier_block *notifier,
enum dev_pm_qos_req_type type)
{ return 0; }
static inline void dev_pm_qos_constraints_init(struct device *dev)
{