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Subject[PATCH V4 3/9] PM / QOS: Keep common notifier list for genpd constraints
Date
Only the resume_latency constraint uses the notifiers right now. In
order to prepare for adding new constraint types with notifiers, move to
a common notifier list.

Update pm_qos_update_target() to pass a pointer to the constraint
structure to the notifier callbacks. Also update the notifier callbacks
as well to error out for unexpected constraints.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/base/power/domain.c | 26 +++++++++++++++++++-------
drivers/base/power/qos.c | 15 ++++-----------
include/linux/pm_qos.h | 7 +++++++
kernel/power/qos.c | 2 +-
4 files changed, 31 insertions(+), 19 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 1a0549f1944a..6e4e22aa14a2 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -416,14 +416,10 @@ static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
return ret;
}

-static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
- unsigned long val, void *ptr)
+static int __resume_latency_notifier(struct generic_pm_domain_data *gpd_data,
+ unsigned long val)
{
- struct generic_pm_domain_data *gpd_data;
- struct device *dev;
-
- gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
- dev = gpd_data->base.dev;
+ struct device *dev = gpd_data->base.dev;

for (;;) {
struct generic_pm_domain *genpd;
@@ -456,6 +452,22 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
return NOTIFY_DONE;
}

+static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
+ unsigned long val, void *ptr)
+{
+ struct generic_pm_domain_data *gpd_data;
+ struct device *dev;
+
+ gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
+ dev = gpd_data->base.dev;
+
+ if (dev_pm_qos_notifier_is_resume_latency(dev, ptr))
+ return __resume_latency_notifier(gpd_data, val);
+
+ dev_err(dev, "%s: Unexpected notifier call\n", __func__);
+ return NOTIFY_BAD;
+}
+
/**
* genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
* @work: Work structure used for scheduling the execution of this function.
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index f850daeffba4..654d8a12c2e7 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -172,18 +172,12 @@ static int dev_pm_qos_constraints_allocate(struct device *dev)
{
struct dev_pm_qos *qos;
struct pm_qos_constraints *c;
- struct blocking_notifier_head *n;

qos = kzalloc(sizeof(*qos), GFP_KERNEL);
if (!qos)
return -ENOMEM;

- n = kzalloc(sizeof(*n), GFP_KERNEL);
- if (!n) {
- kfree(qos);
- return -ENOMEM;
- }
- BLOCKING_INIT_NOTIFIER_HEAD(n);
+ BLOCKING_INIT_NOTIFIER_HEAD(&qos->notifiers);

c = &qos->resume_latency;
plist_head_init(&c->list);
@@ -191,7 +185,7 @@ static int dev_pm_qos_constraints_allocate(struct device *dev)
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;
+ c->notifiers = &qos->notifiers;

c = &qos->latency_tolerance;
plist_head_init(&c->list);
@@ -268,7 +262,6 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
dev->power.qos = ERR_PTR(-ENODEV);
spin_unlock_irq(&dev->power.lock);

- kfree(qos->resume_latency.notifiers);
kfree(qos);

out:
@@ -487,7 +480,7 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier)
ret = dev_pm_qos_constraints_allocate(dev);

if (!ret)
- ret = blocking_notifier_chain_register(dev->power.qos->resume_latency.notifiers,
+ ret = blocking_notifier_chain_register(&dev->power.qos->notifiers,
notifier);

mutex_unlock(&dev_pm_qos_mtx);
@@ -514,7 +507,7 @@ int dev_pm_qos_remove_notifier(struct device *dev,

/* Silently return if the constraints object is not present. */
if (!IS_ERR_OR_NULL(dev->power.qos))
- retval = blocking_notifier_chain_unregister(dev->power.qos->resume_latency.notifiers,
+ retval = blocking_notifier_chain_unregister(&dev->power.qos->notifiers,
notifier);

mutex_unlock(&dev_pm_qos_mtx);
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 032b55909145..bcae6abb3f21 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -100,6 +100,7 @@ struct dev_pm_qos {
struct dev_pm_qos_request *resume_latency_req;
struct dev_pm_qos_request *latency_tolerance_req;
struct dev_pm_qos_request *flags_req;
+ struct blocking_notifier_head notifiers; /* common for all constraints */
};

/* Action requested to pm_qos_update_target */
@@ -114,6 +115,12 @@ static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
return req->dev != NULL;
}

+static inline bool dev_pm_qos_notifier_is_resume_latency(struct device *dev,
+ struct pm_qos_constraints *c)
+{
+ return &dev->power.qos->resume_latency == c;
+}
+
int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
enum pm_qos_req_action action, int value);
bool pm_qos_update_flags(struct pm_qos_flags *pqf,
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 97b0df71303e..073324e0c3c8 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -315,7 +315,7 @@ int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
if (c->notifiers)
blocking_notifier_call_chain(c->notifiers,
(unsigned long)curr_value,
- NULL);
+ c);
} else {
ret = 0;
}
--
2.12.0.432.g71c3a4f4ba37
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