Commit 327adaed authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / QoS: Add no_constraints_value field to struct pm_qos_constraints 



Add a new field, no_constraints_value, to struct pm_qos_constraints
representing a list of PM QoS constraint requests to be returned by
pm_qos_get_value() when that list of requests is empty.

That field will be equal to default_value for all of the existing
global PM QoS classes and for the resume latency device PM QoS type,
but it will be different from default_value for the new latency
tolerance device PM QoS type introduced by the next changeset.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent b02f6695

drivers/base/power/qos.c

+1 −0
Original line number Diff line number Diff line
@@ -190,6 +190,7 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) 
	plist_head_init(&c->list);

	c->target_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;

	c->default_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;

	c->no_constraint_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;

	c->type = PM_QOS_MIN;

	c->notifiers = n;

include/linux/pm_qos.h

+1 −0
Original line number Diff line number Diff line
@@ -77,6 +77,7 @@ struct pm_qos_constraints { 
	struct plist_head list;

	s32 target_value;	/* Do not change to 64 bit */

	s32 default_value;

	s32 no_constraint_value;

	enum pm_qos_type type;

	struct blocking_notifier_head *notifiers;

};

kernel/power/qos.c

+4 −1
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ static struct pm_qos_constraints cpu_dma_constraints = { 
	.list = PLIST_HEAD_INIT(cpu_dma_constraints.list),

	.target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,

	.default_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,

	.no_constraint_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,

	.type = PM_QOS_MIN,

	.notifiers = &cpu_dma_lat_notifier,

};
@@ -79,6 +80,7 @@ static struct pm_qos_constraints network_lat_constraints = { 
	.list = PLIST_HEAD_INIT(network_lat_constraints.list),

	.target_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,

	.default_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,

	.no_constraint_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,

	.type = PM_QOS_MIN,

	.notifiers = &network_lat_notifier,

};
@@ -93,6 +95,7 @@ static struct pm_qos_constraints network_tput_constraints = { 
	.list = PLIST_HEAD_INIT(network_tput_constraints.list),

	.target_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,

	.default_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,

	.no_constraint_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,

	.type = PM_QOS_MAX,

	.notifiers = &network_throughput_notifier,

};
@@ -128,7 +131,7 @@ static const struct file_operations pm_qos_power_fops = { 
static inline int pm_qos_get_value(struct pm_qos_constraints *c)

{

	if (plist_head_empty(&c->list))

		return c->default_value;

		return c->no_constraint_value;



	switch (c->type) {

	case PM_QOS_MIN:

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