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PM / QOS: Pass request type to dev_pm_qos_read_value()

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In order to allow dev_pm_qos_read_value() to read values for different
QoS requests, pass request type as a parameter to these routines.

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 13:06:19 +05:30 committed by Rafael J. Wysocki
parent 8262331eaa
commit 2a79ea5ec5
4 changed files with 27 additions and 10 deletions
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2
Documentation/power/pm_qos_interface.txt
View File

@ -123,7 +123,7 @@ Will remove the element. After removal it will update the aggregate target and
call the notification trees if the target was changed as a result of removing
the request.
s32 dev_pm_qos_read_value(device):
s32 dev_pm_qos_read_value(device, type):
Returns the aggregated value for a given device's constraints list.
enum pm_qos_flags_status dev_pm_qos_flags(device, mask)

2
drivers/base/power/domain_governor.c
View File

@ -33,7 +33,7 @@ static int dev_update_qos_constraint(struct device *dev, void *data)
* take its current PM QoS constraint (that's the only thing
* known at this point anyway).
*/
constraint_ns = dev_pm_qos_read_value(dev);
constraint_ns = dev_pm_qos_read_value(dev, DEV_PM_QOS_RESUME_LATENCY);
constraint_ns *= NSEC_PER_USEC;
}

17
drivers/base/power/qos.c
View File

@ -105,18 +105,25 @@ s32 __dev_pm_qos_resume_latency(struct device *dev)
/**
* dev_pm_qos_read_value - Get PM QoS constraint for a given device (locked).
* @dev: Device to get the PM QoS constraint value for.
* @type: QoS request type.
*/
s32 dev_pm_qos_read_value(struct device *dev)
s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type)
{
struct dev_pm_qos *qos = dev->power.qos;
unsigned long flags;
s32 ret;
spin_lock_irqsave(&dev->power.lock, flags);
if (IS_ERR_OR_NULL(dev->power.qos))
ret = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
else
ret = pm_qos_read_value(&dev->power.qos->resume_latency);
switch (type) {
case DEV_PM_QOS_RESUME_LATENCY:
ret = IS_ERR_OR_NULL(qos) ? PM_QOS_RESUME_LATENCY_NO_CONSTRAINT
: pm_qos_read_value(&qos->resume_latency);
break;
default:
WARN_ON(1);
ret = 0;
}
spin_unlock_irqrestore(&dev->power.lock, flags);

16
include/linux/pm_qos.h
View File

@ -140,7 +140,7 @@ s32 pm_qos_read_value(struct pm_qos_constraints *c);
enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
s32 __dev_pm_qos_resume_latency(struct device *dev);
s32 dev_pm_qos_read_value(struct device *dev);
s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type);
int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
enum dev_pm_qos_req_type type, s32 value);
int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
@ -191,8 +191,18 @@ static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
{ return PM_QOS_FLAGS_UNDEFINED; }
static inline s32 __dev_pm_qos_resume_latency(struct device *dev)
{ return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
static inline s32 dev_pm_qos_read_value(struct device *dev)
{ return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
static inline s32 dev_pm_qos_read_value(struct device *dev,
enum dev_pm_qos_req_type type)
{
switch (type) {
case DEV_PM_QOS_RESUME_LATENCY:
return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
default:
WARN_ON(1);
return 0;
}
}
static inline int dev_pm_qos_add_request(struct device *dev,
struct dev_pm_qos_request *req,
enum dev_pm_qos_req_type type,