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Commit 737002b5 authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki
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PM / OPP: Relocate few routines 

In order to prepare for the later commits, this relocates few routines
towards the top as they will be used earlier in the code.
Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Reviewed-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 3566c5b2
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Showing with 139 additions and 138 deletions
drivers/base/power/opp.c
View file @ 737002b5
......@@ -437,6 +437,102 @@ static struct device_opp *_add_device_opp(struct device *dev)
return dev_opp;
}
/**
* _kfree_device_rcu() - Free device_opp RCU handler
* @head: RCU head
*/
static void _kfree_device_rcu(struct rcu_head *head)
{
struct device_opp *device_opp = container_of(head, struct device_opp, rcu_head);
kfree_rcu(device_opp, rcu_head);
}
/**
* _kfree_opp_rcu() - Free OPP RCU handler
* @head: RCU head
*/
static void _kfree_opp_rcu(struct rcu_head *head)
{
struct dev_pm_opp *opp = container_of(head, struct dev_pm_opp, rcu_head);
kfree_rcu(opp, rcu_head);
}
/**
* _opp_remove() - Remove an OPP from a table definition
* @dev_opp: points back to the device_opp struct this opp belongs to
* @opp: pointer to the OPP to remove
*
* This function removes an opp definition from the opp list.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* It is assumed that the caller holds required mutex for an RCU updater
* strategy.
*/
static void _opp_remove(struct device_opp *dev_opp,
struct dev_pm_opp *opp)
{
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp);
list_del_rcu(&opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
if (list_empty(&dev_opp->opp_list)) {
list_del_rcu(&dev_opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &dev_opp->rcu_head,
_kfree_device_rcu);
}
}
/**
* dev_pm_opp_remove() - Remove an OPP from OPP list
* @dev: device for which we do this operation
* @freq: OPP to remove with matching 'freq'
*
* This function removes an opp from the opp list.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
void dev_pm_opp_remove(struct device *dev, unsigned long freq)
{
struct dev_pm_opp *opp;
struct device_opp *dev_opp;
bool found = false;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp))
goto unlock;
list_for_each_entry(opp, &dev_opp->opp_list, node) {
if (opp->rate == freq) {
found = true;
break;
}
}
if (!found) {
dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
__func__, freq);
goto unlock;
}
_opp_remove(dev_opp, opp);
unlock:
mutex_unlock(&dev_opp_list_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
/**
* _opp_add_dynamic() - Allocate a dynamic OPP.
* @dev: device for which we do this operation
......@@ -569,102 +665,6 @@ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_add);
/**
* _kfree_opp_rcu() - Free OPP RCU handler
* @head: RCU head
*/
static void _kfree_opp_rcu(struct rcu_head *head)
{
struct dev_pm_opp *opp = container_of(head, struct dev_pm_opp, rcu_head);
kfree_rcu(opp, rcu_head);
}
/**
* _kfree_device_rcu() - Free device_opp RCU handler
* @head: RCU head
*/
static void _kfree_device_rcu(struct rcu_head *head)
{
struct device_opp *device_opp = container_of(head, struct device_opp, rcu_head);
kfree_rcu(device_opp, rcu_head);
}
/**
* _opp_remove() - Remove an OPP from a table definition
* @dev_opp: points back to the device_opp struct this opp belongs to
* @opp: pointer to the OPP to remove
*
* This function removes an opp definition from the opp list.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* It is assumed that the caller holds required mutex for an RCU updater
* strategy.
*/
static void _opp_remove(struct device_opp *dev_opp,
struct dev_pm_opp *opp)
{
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp);
list_del_rcu(&opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
if (list_empty(&dev_opp->opp_list)) {
list_del_rcu(&dev_opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &dev_opp->rcu_head,
_kfree_device_rcu);
}
}
/**
* dev_pm_opp_remove() - Remove an OPP from OPP list
* @dev: device for which we do this operation
* @freq: OPP to remove with matching 'freq'
*
* This function removes an opp from the opp list.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
void dev_pm_opp_remove(struct device *dev, unsigned long freq)
{
struct dev_pm_opp *opp;
struct device_opp *dev_opp;
bool found = false;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp))
goto unlock;
list_for_each_entry(opp, &dev_opp->opp_list, node) {
if (opp->rate == freq) {
found = true;
break;
}
}
if (!found) {
dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
__func__, freq);
goto unlock;
}
_opp_remove(dev_opp, opp);
unlock:
mutex_unlock(&dev_opp_list_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
/**
* _opp_set_availability() - helper to set the availability of an opp
* @dev: device for which we do this operation
......@@ -824,6 +824,49 @@ struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev)
EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
#ifdef CONFIG_OF
/**
* of_free_opp_table() - Free OPP table entries created from static DT entries
* @dev: device pointer used to lookup device OPPs.
*
* Free OPPs created using static entries present in DT.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Hence this function indirectly uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
void of_free_opp_table(struct device *dev)
{
struct device_opp *dev_opp;
struct dev_pm_opp *opp, *tmp;
/* Check for existing list for 'dev' */
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
int error = PTR_ERR(dev_opp);
if (error != -ENODEV)
WARN(1, "%s: dev_opp: %d\n",
IS_ERR_OR_NULL(dev) ?
"Invalid device" : dev_name(dev),
error);
return;
}
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Free static OPPs */
list_for_each_entry_safe(opp, tmp, &dev_opp->opp_list, node) {
if (!opp->dynamic)
_opp_remove(dev_opp, opp);
}
mutex_unlock(&dev_opp_list_lock);
}
EXPORT_SYMBOL_GPL(of_free_opp_table);
/**
* of_init_opp_table() - Initialize opp table from device tree
* @dev: device pointer used to lookup device OPPs.
......@@ -882,46 +925,4 @@ int of_init_opp_table(struct device *dev)
return 0;
}
EXPORT_SYMBOL_GPL(of_init_opp_table);
/**
* of_free_opp_table() - Free OPP table entries created from static DT entries
* @dev: device pointer used to lookup device OPPs.
*
* Free OPPs created using static entries present in DT.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Hence this function indirectly uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
void of_free_opp_table(struct device *dev)
{
struct device_opp *dev_opp;
struct dev_pm_opp *opp, *tmp;
/* Check for existing list for 'dev' */
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
int error = PTR_ERR(dev_opp);
if (error != -ENODEV)
WARN(1, "%s: dev_opp: %d\n",
IS_ERR_OR_NULL(dev) ?
"Invalid device" : dev_name(dev),
error);
return;
}
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Free static OPPs */
list_for_each_entry_safe(opp, tmp, &dev_opp->opp_list, node) {
if (!opp->dynamic)
_opp_remove(dev_opp, opp);
}
mutex_unlock(&dev_opp_list_lock);
}
EXPORT_SYMBOL_GPL(of_free_opp_table);
#endif
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