PM / OPP: Don't allocate OPP table from _opp_allocate()
There is no point in trying to find/allocate the table for every OPP that is added for a device. It would be far more efficient to allocate the table only once and pass its pointer to the routines that add the OPP entry. Locking is removed from _opp_add_static_v2() and _opp_add_v1() now as the callers call them with that lock already held. Call to _remove_opp_table() routine is also removed from _opp_free() now, as opp_table isn't allocated from within _opp_allocate(). This is handled by the routines which created the OPP table in the first place. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
Rafael J. Wysocki
parent
9274c89243
commit
8cd2f6e8f3
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@ -829,7 +829,7 @@ struct opp_device *_add_opp_dev(const struct device *dev,
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*
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* Return: valid opp_table pointer if success, else NULL.
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*/
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static struct opp_table *_add_opp_table(struct device *dev)
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struct opp_table *_add_opp_table(struct device *dev)
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{
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struct opp_table *opp_table;
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struct opp_device *opp_dev;
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@ -929,10 +929,9 @@ static void _remove_opp_table(struct opp_table *opp_table)
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_kfree_device_rcu);
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}
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void _opp_free(struct dev_pm_opp *opp, struct opp_table *opp_table)
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void _opp_free(struct dev_pm_opp *opp)
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{
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kfree(opp);
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_remove_opp_table(opp_table);
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}
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/**
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@ -1016,16 +1015,10 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
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struct dev_pm_opp *_opp_allocate(struct device *dev,
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struct opp_table **opp_table)
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struct dev_pm_opp *_opp_allocate(struct opp_table *table)
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{
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struct dev_pm_opp *opp;
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int count, supply_size;
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struct opp_table *table;
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table = _add_opp_table(dev);
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if (!table)
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return NULL;
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/* Allocate space for at least one supply */
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count = table->regulator_count ? table->regulator_count : 1;
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@ -1033,17 +1026,13 @@ struct dev_pm_opp *_opp_allocate(struct device *dev,
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/* allocate new OPP node and supplies structures */
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opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL);
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if (!opp) {
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kfree(table);
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if (!opp)
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return NULL;
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}
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/* Put the supplies at the end of the OPP structure as an empty array */
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opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
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INIT_LIST_HEAD(&opp->node);
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*opp_table = table;
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return opp;
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}
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@ -1133,6 +1122,7 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
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/**
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* _opp_add_v1() - Allocate a OPP based on v1 bindings.
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* @opp_table: OPP table
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* @dev: device for which we do this operation
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* @freq: Frequency in Hz for this OPP
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* @u_volt: Voltage in uVolts for this OPP
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@ -1158,22 +1148,18 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
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* Duplicate OPPs (both freq and volt are same) and !opp->available
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* -ENOMEM Memory allocation failure
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*/
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int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
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bool dynamic)
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int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
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unsigned long freq, long u_volt, bool dynamic)
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{
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struct opp_table *opp_table;
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struct dev_pm_opp *new_opp;
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unsigned long tol;
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int ret;
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/* Hold our table modification lock here */
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mutex_lock(&opp_table_lock);
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opp_rcu_lockdep_assert();
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new_opp = _opp_allocate(dev, &opp_table);
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if (!new_opp) {
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ret = -ENOMEM;
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goto unlock;
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}
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new_opp = _opp_allocate(opp_table);
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if (!new_opp)
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return -ENOMEM;
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/* populate the opp table */
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new_opp->rate = freq;
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@ -1192,8 +1178,6 @@ int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
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goto free_opp;
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}
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mutex_unlock(&opp_table_lock);
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/*
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* Notify the changes in the availability of the operable
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* frequency/voltage list.
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@ -1202,9 +1186,8 @@ int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
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return 0;
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free_opp:
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_opp_free(new_opp, opp_table);
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unlock:
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mutex_unlock(&opp_table_lock);
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_opp_free(new_opp);
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return ret;
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}
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@ -1722,7 +1705,25 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_register_put_opp_helper);
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*/
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int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
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{
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return _opp_add_v1(dev, freq, u_volt, true);
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struct opp_table *opp_table;
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int ret;
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/* Hold our table modification lock here */
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mutex_lock(&opp_table_lock);
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opp_table = _add_opp_table(dev);
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if (!opp_table) {
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ret = -ENOMEM;
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goto unlock;
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}
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ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
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if (ret)
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_remove_opp_table(opp_table);
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unlock:
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mutex_unlock(&opp_table_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_add);
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@ -1888,8 +1889,8 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
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* Free OPPs either created using static entries present in DT or even the
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* dynamically added entries based on remove_all param.
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*/
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static void _dev_pm_opp_remove_table(struct opp_table *opp_table,
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struct device *dev, bool remove_all)
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void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev,
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bool remove_all)
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{
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struct dev_pm_opp *opp, *tmp;
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@ -255,6 +255,7 @@ static struct device_node *_of_get_opp_desc_node(struct device *dev)
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/**
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* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
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* @opp_table: OPP table
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* @dev: device for which we do this operation
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* @np: device node
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*
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@ -276,22 +277,17 @@ static struct device_node *_of_get_opp_desc_node(struct device *dev)
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* -ENOMEM Memory allocation failure
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* -EINVAL Failed parsing the OPP node
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*/
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static int _opp_add_static_v2(struct device *dev, struct device_node *np)
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static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev,
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struct device_node *np)
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{
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struct opp_table *opp_table;
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struct dev_pm_opp *new_opp;
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u64 rate;
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u32 val;
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int ret;
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/* Hold our table modification lock here */
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mutex_lock(&opp_table_lock);
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new_opp = _opp_allocate(dev, &opp_table);
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if (!new_opp) {
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ret = -ENOMEM;
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goto unlock;
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}
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new_opp = _opp_allocate(opp_table);
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if (!new_opp)
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return -ENOMEM;
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ret = of_property_read_u64(np, "opp-hz", &rate);
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if (ret < 0) {
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@ -347,8 +343,6 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
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if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
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opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
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mutex_unlock(&opp_table_lock);
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pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
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__func__, new_opp->turbo, new_opp->rate,
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new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
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@ -362,9 +356,8 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
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return 0;
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free_opp:
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_opp_free(new_opp, opp_table);
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unlock:
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mutex_unlock(&opp_table_lock);
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_opp_free(new_opp);
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return ret;
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}
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@ -382,16 +375,20 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
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/* OPPs are already managed */
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if (!_add_opp_dev(dev, opp_table))
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ret = -ENOMEM;
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mutex_unlock(&opp_table_lock);
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return ret;
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goto unlock;
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}
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opp_table = _add_opp_table(dev);
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if (!opp_table) {
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ret = -ENOMEM;
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goto unlock;
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}
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mutex_unlock(&opp_table_lock);
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/* We have opp-table node now, iterate over it and add OPPs */
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for_each_available_child_of_node(opp_np, np) {
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count++;
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ret = _opp_add_static_v2(dev, np);
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ret = _opp_add_static_v2(opp_table, dev, np);
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if (ret) {
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dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
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ret);
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@ -400,15 +397,8 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
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}
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/* There should be one of more OPP defined */
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if (WARN_ON(!count))
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return -ENOENT;
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mutex_lock(&opp_table_lock);
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opp_table = _find_opp_table(dev);
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if (WARN_ON(IS_ERR(opp_table))) {
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ret = PTR_ERR(opp_table);
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mutex_unlock(&opp_table_lock);
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if (WARN_ON(!count)) {
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ret = -ENOENT;
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goto free_table;
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}
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@ -418,12 +408,12 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
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else
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opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
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mutex_unlock(&opp_table_lock);
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return 0;
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goto unlock;
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free_table:
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dev_pm_opp_of_remove_table(dev);
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_dev_pm_opp_remove_table(opp_table, dev, false);
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unlock:
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mutex_unlock(&opp_table_lock);
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return ret;
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}
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@ -431,9 +421,10 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
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/* Initializes OPP tables based on old-deprecated bindings */
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static int _of_add_opp_table_v1(struct device *dev)
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{
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struct opp_table *opp_table;
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const struct property *prop;
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const __be32 *val;
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int nr, ret;
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int nr, ret = 0;
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prop = of_find_property(dev->of_node, "operating-points", NULL);
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if (!prop)
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@ -451,22 +442,32 @@ static int _of_add_opp_table_v1(struct device *dev)
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return -EINVAL;
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}
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mutex_lock(&opp_table_lock);
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opp_table = _add_opp_table(dev);
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if (!opp_table) {
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ret = -ENOMEM;
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goto unlock;
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}
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val = prop->value;
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while (nr) {
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unsigned long freq = be32_to_cpup(val++) * 1000;
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unsigned long volt = be32_to_cpup(val++);
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ret = _opp_add_v1(dev, freq, volt, false);
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ret = _opp_add_v1(opp_table, dev, freq, volt, false);
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if (ret) {
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dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
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__func__, freq, ret);
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dev_pm_opp_of_remove_table(dev);
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return ret;
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_dev_pm_opp_remove_table(opp_table, dev, false);
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break;
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}
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nr -= 2;
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}
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return 0;
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unlock:
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mutex_unlock(&opp_table_lock);
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return ret;
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}
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/**
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@ -191,13 +191,16 @@ struct opp_table {
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/* Routines internal to opp core */
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struct opp_table *_find_opp_table(struct device *dev);
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struct opp_table *_add_opp_table(struct device *dev);
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struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
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void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, bool remove_all);
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void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all);
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struct dev_pm_opp *_opp_allocate(struct device *dev, struct opp_table **opp_table);
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void _opp_free(struct dev_pm_opp *opp, struct opp_table *opp_table);
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struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
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void _opp_free(struct dev_pm_opp *opp);
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int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
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int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, bool dynamic);
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int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
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void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);
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struct opp_table *_add_opp_table(struct device *dev);
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#ifdef CONFIG_OF
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void _of_init_opp_table(struct opp_table *opp_table, struct device *dev);
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