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PM / OPP: Take kref from _find_opp_table()

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Take reference of the OPP table from within _find_opp_table(). Also
update the callers of _find_opp_table() to call
dev_pm_opp_put_opp_table() after they have used the OPP table.

Note that _find_opp_table() increments the reference under the
opp_table_lock.

Now that the OPP table wouldn't get freed until the callers of
_find_opp_table() call dev_pm_opp_put_opp_table(), there is no need to
take the opp_table_lock or rcu_read_lock() around it. Drop them.

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 2017-01-23 10:11:48 +05:30 committed by Rafael J. Wysocki
parent 8a31d9d942
commit 5b650b3888
2 changed files with 95 additions and 122 deletions
drivers/base/power/opp
core.ccpu.c

191
drivers/base/power/opp/core.c
View File

@ -54,6 +54,21 @@ static struct opp_device *_find_opp_dev(const struct device *dev,
return NULL; return NULL;
} }
struct opp_table *_find_opp_table_unlocked(struct device *dev)
{
struct opp_table *opp_table;
list_for_each_entry(opp_table, &opp_tables, node) {
if (_find_opp_dev(dev, opp_table)) {
_get_opp_table_kref(opp_table);
return opp_table;
}
}
return ERR_PTR(-ENODEV);
}
/** /**
* _find_opp_table() - find opp_table struct using device pointer * _find_opp_table() - find opp_table struct using device pointer
* @dev: device pointer used to lookup OPP table * @dev: device pointer used to lookup OPP table
@ -64,28 +79,22 @@ static struct opp_device *_find_opp_dev(const struct device *dev,
* Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
* -EINVAL based on type of error. * -EINVAL based on type of error.
* *
* Locking: For readers, this function must be called under rcu_read_lock(). * The callers must call dev_pm_opp_put_opp_table() after the table is used.
* opp_table is a RCU protected pointer, which means that opp_table is valid
* as long as we are under RCU lock.
*
* For Writers, this function must be called with opp_table_lock held.
*/ */
struct opp_table *_find_opp_table(struct device *dev) struct opp_table *_find_opp_table(struct device *dev)
{ {
struct opp_table *opp_table; struct opp_table *opp_table;
opp_rcu_lockdep_assert();
if (IS_ERR_OR_NULL(dev)) { if (IS_ERR_OR_NULL(dev)) {
pr_err("%s: Invalid parameters\n", __func__); pr_err("%s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
list_for_each_entry_rcu(opp_table, &opp_tables, node) mutex_lock(&opp_table_lock);
if (_find_opp_dev(dev, opp_table)) opp_table = _find_opp_table_unlocked(dev);
return opp_table; mutex_unlock(&opp_table_lock);
return ERR_PTR(-ENODEV); return opp_table;
} }
/** /**
@ -175,23 +184,20 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
* @dev: device for which we do this operation * @dev: device for which we do this operation
* *
* Return: This function returns the max clock latency in nanoseconds. * Return: This function returns the max clock latency in nanoseconds.
*
* Locking: This function takes rcu_read_lock().
*/ */
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
{ {
struct opp_table *opp_table; struct opp_table *opp_table;
unsigned long clock_latency_ns; unsigned long clock_latency_ns;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) if (IS_ERR(opp_table))
clock_latency_ns = 0; return 0;
else
clock_latency_ns = opp_table->clock_latency_ns_max; clock_latency_ns = opp_table->clock_latency_ns_max;
dev_pm_opp_put_opp_table(opp_table);
rcu_read_unlock();
return clock_latency_ns; return clock_latency_ns;
} }
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
@ -201,15 +207,13 @@ static int _get_regulator_count(struct device *dev)
struct opp_table *opp_table; struct opp_table *opp_table;
int count; int count;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (!IS_ERR(opp_table)) if (IS_ERR(opp_table))
count = opp_table->regulator_count; return 0;
else
count = 0;
rcu_read_unlock(); count = opp_table->regulator_count;
dev_pm_opp_put_opp_table(opp_table);
return count; return count;
} }
@ -248,13 +252,11 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
if (!uV) if (!uV)
goto free_regulators; goto free_regulators;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table))
rcu_read_unlock();
goto free_uV; goto free_uV;
}
rcu_read_lock();
memcpy(regulators, opp_table->regulators, count * sizeof(*regulators)); memcpy(regulators, opp_table->regulators, count * sizeof(*regulators));
@ -274,6 +276,7 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
} }
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
/* /*
* The caller needs to ensure that opp_table (and hence the regulator) * The caller needs to ensure that opp_table (and hence the regulator)
@ -323,17 +326,15 @@ unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
struct opp_table *opp_table; struct opp_table *opp_table;
unsigned long freq = 0; unsigned long freq = 0;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table) || !opp_table->suspend_opp || if (IS_ERR(opp_table))
!opp_table->suspend_opp->available) return 0;
goto unlock;
freq = dev_pm_opp_get_freq(opp_table->suspend_opp); if (opp_table->suspend_opp && opp_table->suspend_opp->available)
freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
dev_pm_opp_put_opp_table(opp_table);
unlock:
rcu_read_unlock();
return freq; return freq;
} }
EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
@ -353,23 +354,24 @@ int dev_pm_opp_get_opp_count(struct device *dev)
struct dev_pm_opp *temp_opp; struct dev_pm_opp *temp_opp;
int count = 0; int count = 0;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table)) {
count = PTR_ERR(opp_table); count = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n", dev_err(dev, "%s: OPP table not found (%d)\n",
__func__, count); __func__, count);
goto out_unlock; return count;
} }
rcu_read_lock();
list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available) if (temp_opp->available)
count++; count++;
} }
out_unlock:
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return count; return count;
} }
EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
@ -404,17 +406,16 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
struct opp_table *opp_table; struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table)) {
int r = PTR_ERR(opp_table); int r = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
rcu_read_unlock();
return ERR_PTR(r); return ERR_PTR(r);
} }
rcu_read_lock();
list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available == available && if (temp_opp->available == available &&
temp_opp->rate == freq) { temp_opp->rate == freq) {
@ -427,6 +428,7 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
} }
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return opp; return opp;
} }
@ -480,17 +482,16 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table))
rcu_read_unlock();
return ERR_CAST(opp_table); return ERR_CAST(opp_table);
}
rcu_read_lock();
opp = _find_freq_ceil(opp_table, freq); opp = _find_freq_ceil(opp_table, freq);
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return opp; return opp;
} }
@ -525,13 +526,11 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table))
rcu_read_unlock();
return ERR_CAST(opp_table); return ERR_CAST(opp_table);
}
rcu_read_lock();
list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available) { if (temp_opp->available) {
@ -547,6 +546,7 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
if (!IS_ERR(opp)) if (!IS_ERR(opp))
dev_pm_opp_get(opp); dev_pm_opp_get(opp);
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
if (!IS_ERR(opp)) if (!IS_ERR(opp))
*freq = opp->rate; *freq = opp->rate;
@ -564,22 +564,18 @@ static struct clk *_get_opp_clk(struct device *dev)
struct opp_table *opp_table; struct opp_table *opp_table;
struct clk *clk; struct clk *clk;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table)) {
dev_err(dev, "%s: device opp doesn't exist\n", __func__); dev_err(dev, "%s: device opp doesn't exist\n", __func__);
clk = ERR_CAST(opp_table); return ERR_CAST(opp_table);
goto unlock;
} }
clk = opp_table->clk; clk = opp_table->clk;
if (IS_ERR(clk)) if (IS_ERR(clk))
dev_err(dev, "%s: No clock available for the device\n", dev_err(dev, "%s: No clock available for the device\n",
__func__); __func__);
dev_pm_opp_put_opp_table(opp_table);
unlock:
rcu_read_unlock();
return clk; return clk;
} }
@ -715,15 +711,14 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
return 0; return 0;
} }
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table)) {
dev_err(dev, "%s: device opp doesn't exist\n", __func__); dev_err(dev, "%s: device opp doesn't exist\n", __func__);
rcu_read_unlock();
return PTR_ERR(opp_table); return PTR_ERR(opp_table);
} }
rcu_read_lock();
old_opp = _find_freq_ceil(opp_table, &old_freq); old_opp = _find_freq_ceil(opp_table, &old_freq);
if (IS_ERR(old_opp)) { if (IS_ERR(old_opp)) {
dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n",
@ -738,6 +733,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
if (!IS_ERR(old_opp)) if (!IS_ERR(old_opp))
dev_pm_opp_put(old_opp); dev_pm_opp_put(old_opp);
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return ret; return ret;
} }
@ -752,6 +748,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
if (!IS_ERR(old_opp)) if (!IS_ERR(old_opp))
dev_pm_opp_put(old_opp); dev_pm_opp_put(old_opp);
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return _generic_set_opp_clk_only(dev, clk, old_freq, freq); return _generic_set_opp_clk_only(dev, clk, old_freq, freq);
} }
@ -780,6 +777,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
if (!IS_ERR(old_opp)) if (!IS_ERR(old_opp))
dev_pm_opp_put(old_opp); dev_pm_opp_put(old_opp);
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return set_opp(data); return set_opp(data);
} }
@ -893,11 +891,9 @@ struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
/* Hold our table modification lock here */ /* Hold our table modification lock here */
mutex_lock(&opp_table_lock); mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(dev); opp_table = _find_opp_table_unlocked(dev);
if (!IS_ERR(opp_table)) { if (!IS_ERR(opp_table))
_get_opp_table_kref(opp_table);
goto unlock; goto unlock;
}
opp_table = _allocate_opp_table(dev); opp_table = _allocate_opp_table(dev);
@ -1004,12 +1000,9 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
struct opp_table *opp_table; struct opp_table *opp_table;
bool found = false; bool found = false;
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) if (IS_ERR(opp_table))
goto unlock; return;
mutex_lock(&opp_table->lock); mutex_lock(&opp_table->lock);
@ -1022,15 +1015,14 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
mutex_unlock(&opp_table->lock); mutex_unlock(&opp_table->lock);
if (!found) { if (found) {
dev_pm_opp_put(opp);
} else {
dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
__func__, freq); __func__, freq);
goto unlock;
} }
dev_pm_opp_put(opp); dev_pm_opp_put_opp_table(opp_table);
unlock:
mutex_unlock(&opp_table_lock);
} }
EXPORT_SYMBOL_GPL(dev_pm_opp_remove); EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
@ -1648,14 +1640,12 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
if (!new_opp) if (!new_opp)
return -ENOMEM; return -ENOMEM;
mutex_lock(&opp_table_lock);
/* Find the opp_table */ /* Find the opp_table */
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table)) {
r = PTR_ERR(opp_table); r = PTR_ERR(opp_table);
dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
goto unlock; goto free_opp;
} }
mutex_lock(&opp_table->lock); mutex_lock(&opp_table->lock);
@ -1668,8 +1658,6 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
} }
} }
mutex_unlock(&opp_table->lock);
if (IS_ERR(opp)) { if (IS_ERR(opp)) {
r = PTR_ERR(opp); r = PTR_ERR(opp);
goto unlock; goto unlock;
@ -1685,7 +1673,6 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
new_opp->available = availability_req; new_opp->available = availability_req;
list_replace_rcu(&opp->node, &new_opp->node); list_replace_rcu(&opp->node, &new_opp->node);
mutex_unlock(&opp_table_lock);
call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
/* Notify the change of the OPP availability */ /* Notify the change of the OPP availability */
@ -1696,10 +1683,14 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
srcu_notifier_call_chain(&opp_table->srcu_head, srcu_notifier_call_chain(&opp_table->srcu_head,
OPP_EVENT_DISABLE, new_opp); OPP_EVENT_DISABLE, new_opp);
mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
return 0; return 0;
unlock: unlock:
mutex_unlock(&opp_table_lock); mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
free_opp:
kfree(new_opp); kfree(new_opp);
return r; return r;
} }
@ -1767,18 +1758,16 @@ int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
struct opp_table *opp_table; struct opp_table *opp_table;
int ret; int ret;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table))
ret = PTR_ERR(opp_table); return PTR_ERR(opp_table);
goto unlock;
} rcu_read_lock();
ret = srcu_notifier_chain_register(&opp_table->srcu_head, nb); ret = srcu_notifier_chain_register(&opp_table->srcu_head, nb);
unlock:
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return ret; return ret;
} }
@ -1797,18 +1786,14 @@ int dev_pm_opp_unregister_notifier(struct device *dev,
struct opp_table *opp_table; struct opp_table *opp_table;
int ret; int ret;
rcu_read_lock();
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table))
ret = PTR_ERR(opp_table); return PTR_ERR(opp_table);
goto unlock;
}
ret = srcu_notifier_chain_unregister(&opp_table->srcu_head, nb); ret = srcu_notifier_chain_unregister(&opp_table->srcu_head, nb);
unlock:
rcu_read_unlock(); rcu_read_unlock();
dev_pm_opp_put_opp_table(opp_table);
return ret; return ret;
} }
@ -1839,9 +1824,6 @@ void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all)
{ {
struct opp_table *opp_table; struct opp_table *opp_table;
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
/* Check for existing table for 'dev' */ /* Check for existing table for 'dev' */
opp_table = _find_opp_table(dev); opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table)) {
@ -1852,13 +1834,12 @@ void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all)
IS_ERR_OR_NULL(dev) ? IS_ERR_OR_NULL(dev) ?
"Invalid device" : dev_name(dev), "Invalid device" : dev_name(dev),
error); error);
goto unlock; return;
} }
_dev_pm_opp_remove_table(opp_table, dev, remove_all); _dev_pm_opp_remove_table(opp_table, dev, remove_all);
unlock: dev_pm_opp_put_opp_table(opp_table);
mutex_unlock(&opp_table_lock);
} }
/** /**

26
drivers/base/power/opp/cpu.c
View File

@ -174,13 +174,9 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
struct device *dev; struct device *dev;
int cpu, ret = 0; int cpu, ret = 0;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(cpu_dev); opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table))
ret = PTR_ERR(opp_table); return PTR_ERR(opp_table);
goto unlock;
}
for_each_cpu(cpu, cpumask) { for_each_cpu(cpu, cpumask) {
if (cpu == cpu_dev->id) if (cpu == cpu_dev->id)
@ -203,8 +199,8 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
/* Mark opp-table as multiple CPUs are sharing it now */ /* Mark opp-table as multiple CPUs are sharing it now */
opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
} }
unlock:
mutex_unlock(&opp_table_lock); dev_pm_opp_put_opp_table(opp_table);
return ret; return ret;
} }
@ -232,17 +228,13 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
struct opp_table *opp_table; struct opp_table *opp_table;
int ret = 0; int ret = 0;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(cpu_dev); opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) { if (IS_ERR(opp_table))
ret = PTR_ERR(opp_table); return PTR_ERR(opp_table);
goto unlock;
}
if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) { if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
ret = -EINVAL; ret = -EINVAL;
goto unlock; goto put_opp_table;
} }
cpumask_clear(cpumask); cpumask_clear(cpumask);
@ -254,8 +246,8 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
cpumask_set_cpu(cpu_dev->id, cpumask); cpumask_set_cpu(cpu_dev->id, cpumask);
} }
unlock: put_opp_table:
mutex_unlock(&opp_table_lock); dev_pm_opp_put_opp_table(opp_table);
return ret; return ret;
} }