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Message-Id: <8dea5ed5b800bee0faf835b5c60ece95d6b9f333.1483348138.git.viresh.kumar@linaro.org>
Date: Mon, 2 Jan 2017 14:41:01 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Rafael Wysocki <rjw@...ysocki.net>,
Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
Stephen Boyd <sboyd@...eaurora.org>
Cc: linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org,
Vincent Guittot <vincent.guittot@...aro.org>,
Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH V3 07/10] 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@...aro.org>
Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>
---
drivers/base/power/opp/core.c | 67 +++++++++++++++++++-------------------
drivers/base/power/opp/of.c | 75 ++++++++++++++++++++++---------------------
drivers/base/power/opp/opp.h | 9 ++++--
3 files changed, 78 insertions(+), 73 deletions(-)
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index b3a624a4af81..dde7dd099aa0 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -829,7 +829,7 @@ struct opp_device *_add_opp_dev(const struct device *dev,
*
* Return: valid opp_table pointer if success, else NULL.
*/
-static struct opp_table *_add_opp_table(struct device *dev)
+struct opp_table *_add_opp_table(struct device *dev)
{
struct opp_table *opp_table;
struct opp_device *opp_dev;
@@ -929,10 +929,9 @@ static void _remove_opp_table(struct opp_table *opp_table)
_kfree_device_rcu);
}
-void _opp_free(struct dev_pm_opp *opp, struct opp_table *opp_table)
+void _opp_free(struct dev_pm_opp *opp)
{
kfree(opp);
- _remove_opp_table(opp_table);
}
/**
@@ -1016,16 +1015,10 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
-struct dev_pm_opp *_opp_allocate(struct device *dev,
- struct opp_table **opp_table)
+struct dev_pm_opp *_opp_allocate(struct opp_table *table)
{
struct dev_pm_opp *opp;
int count, supply_size;
- struct opp_table *table;
-
- table = _add_opp_table(dev);
- if (!table)
- return NULL;
/* Allocate space for at least one supply */
count = table->regulator_count ? table->regulator_count : 1;
@@ -1033,17 +1026,13 @@ struct dev_pm_opp *_opp_allocate(struct device *dev,
/* allocate new OPP node and supplies structures */
opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL);
- if (!opp) {
- kfree(table);
+ if (!opp)
return NULL;
- }
/* Put the supplies at the end of the OPP structure as an empty array */
opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
INIT_LIST_HEAD(&opp->node);
- *opp_table = table;
-
return opp;
}
@@ -1133,6 +1122,7 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
/**
* _opp_add_v1() - Allocate a OPP based on v1 bindings.
+ * @opp_table: OPP table
* @dev: device for which we do this operation
* @freq: Frequency in Hz for this OPP
* @u_volt: Voltage in uVolts for this OPP
@@ -1158,22 +1148,18 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
* Duplicate OPPs (both freq and volt are same) and !opp->available
* -ENOMEM Memory allocation failure
*/
-int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
- bool dynamic)
+int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
+ unsigned long freq, long u_volt, bool dynamic)
{
- struct opp_table *opp_table;
struct dev_pm_opp *new_opp;
unsigned long tol;
int ret;
- /* Hold our table modification lock here */
- mutex_lock(&opp_table_lock);
+ opp_rcu_lockdep_assert();
- new_opp = _opp_allocate(dev, &opp_table);
- if (!new_opp) {
- ret = -ENOMEM;
- goto unlock;
- }
+ new_opp = _opp_allocate(opp_table);
+ if (!new_opp)
+ return -ENOMEM;
/* populate the opp table */
new_opp->rate = freq;
@@ -1192,8 +1178,6 @@ int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
goto free_opp;
}
- mutex_unlock(&opp_table_lock);
-
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
@@ -1202,9 +1186,8 @@ int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
return 0;
free_opp:
- _opp_free(new_opp, opp_table);
-unlock:
- mutex_unlock(&opp_table_lock);
+ _opp_free(new_opp);
+
return ret;
}
@@ -1722,7 +1705,25 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_register_put_opp_helper);
*/
int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
{
- return _opp_add_v1(dev, freq, u_volt, true);
+ struct opp_table *opp_table;
+ int ret;
+
+ /* Hold our table modification lock here */
+ mutex_lock(&opp_table_lock);
+
+ opp_table = _add_opp_table(dev);
+ if (!opp_table) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
+ if (ret)
+ _remove_opp_table(opp_table);
+
+unlock:
+ mutex_unlock(&opp_table_lock);
+ return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_add);
@@ -1888,8 +1889,8 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
* Free OPPs either created using static entries present in DT or even the
* dynamically added entries based on remove_all param.
*/
-static void _dev_pm_opp_remove_table(struct opp_table *opp_table,
- struct device *dev, bool remove_all)
+void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev,
+ bool remove_all)
{
struct dev_pm_opp *opp, *tmp;
diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c
index 442fa46c4f5c..cdbf733ac9b1 100644
--- a/drivers/base/power/opp/of.c
+++ b/drivers/base/power/opp/of.c
@@ -255,6 +255,7 @@ static struct device_node *_of_get_opp_desc_node(struct device *dev)
/**
* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
+ * @opp_table: OPP table
* @dev: device for which we do this operation
* @np: device node
*
@@ -276,22 +277,17 @@ static struct device_node *_of_get_opp_desc_node(struct device *dev)
* -ENOMEM Memory allocation failure
* -EINVAL Failed parsing the OPP node
*/
-static int _opp_add_static_v2(struct device *dev, struct device_node *np)
+static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev,
+ struct device_node *np)
{
- struct opp_table *opp_table;
struct dev_pm_opp *new_opp;
u64 rate;
u32 val;
int ret;
- /* Hold our table modification lock here */
- mutex_lock(&opp_table_lock);
-
- new_opp = _opp_allocate(dev, &opp_table);
- if (!new_opp) {
- ret = -ENOMEM;
- goto unlock;
- }
+ new_opp = _opp_allocate(opp_table);
+ if (!new_opp)
+ return -ENOMEM;
ret = of_property_read_u64(np, "opp-hz", &rate);
if (ret < 0) {
@@ -347,8 +343,6 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
- mutex_unlock(&opp_table_lock);
-
pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
__func__, new_opp->turbo, new_opp->rate,
new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
@@ -362,9 +356,8 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
return 0;
free_opp:
- _opp_free(new_opp, opp_table);
-unlock:
- mutex_unlock(&opp_table_lock);
+ _opp_free(new_opp);
+
return ret;
}
@@ -382,16 +375,20 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
/* OPPs are already managed */
if (!_add_opp_dev(dev, opp_table))
ret = -ENOMEM;
- mutex_unlock(&opp_table_lock);
- return ret;
+ goto unlock;
+ }
+
+ opp_table = _add_opp_table(dev);
+ if (!opp_table) {
+ ret = -ENOMEM;
+ goto unlock;
}
- mutex_unlock(&opp_table_lock);
/* We have opp-table node now, iterate over it and add OPPs */
for_each_available_child_of_node(opp_np, np) {
count++;
- ret = _opp_add_static_v2(dev, np);
+ ret = _opp_add_static_v2(opp_table, dev, np);
if (ret) {
dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
ret);
@@ -400,15 +397,8 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
}
/* There should be one of more OPP defined */
- if (WARN_ON(!count))
- return -ENOENT;
-
- mutex_lock(&opp_table_lock);
-
- opp_table = _find_opp_table(dev);
- if (WARN_ON(IS_ERR(opp_table))) {
- ret = PTR_ERR(opp_table);
- mutex_unlock(&opp_table_lock);
+ if (WARN_ON(!count)) {
+ ret = -ENOENT;
goto free_table;
}
@@ -418,12 +408,12 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
else
opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
- mutex_unlock(&opp_table_lock);
-
- return 0;
+ goto unlock;
free_table:
- dev_pm_opp_of_remove_table(dev);
+ _dev_pm_opp_remove_table(opp_table, dev, false);
+unlock:
+ mutex_unlock(&opp_table_lock);
return ret;
}
@@ -431,9 +421,10 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
/* Initializes OPP tables based on old-deprecated bindings */
static int _of_add_opp_table_v1(struct device *dev)
{
+ struct opp_table *opp_table;
const struct property *prop;
const __be32 *val;
- int nr, ret;
+ int nr, ret = 0;
prop = of_find_property(dev->of_node, "operating-points", NULL);
if (!prop)
@@ -451,22 +442,32 @@ static int _of_add_opp_table_v1(struct device *dev)
return -EINVAL;
}
+ mutex_lock(&opp_table_lock);
+
+ opp_table = _add_opp_table(dev);
+ if (!opp_table) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
val = prop->value;
while (nr) {
unsigned long freq = be32_to_cpup(val++) * 1000;
unsigned long volt = be32_to_cpup(val++);
- ret = _opp_add_v1(dev, freq, volt, false);
+ ret = _opp_add_v1(opp_table, dev, freq, volt, false);
if (ret) {
dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
__func__, freq, ret);
- dev_pm_opp_of_remove_table(dev);
- return ret;
+ _dev_pm_opp_remove_table(opp_table, dev, false);
+ break;
}
nr -= 2;
}
- return 0;
+unlock:
+ mutex_unlock(&opp_table_lock);
+ return ret;
}
/**
diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h
index c4b539a8533a..0a5eb4d1e8f7 100644
--- a/drivers/base/power/opp/opp.h
+++ b/drivers/base/power/opp/opp.h
@@ -191,13 +191,16 @@ struct opp_table {
/* Routines internal to opp core */
struct opp_table *_find_opp_table(struct device *dev);
+struct opp_table *_add_opp_table(struct device *dev);
struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
+void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, bool remove_all);
void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all);
-struct dev_pm_opp *_opp_allocate(struct device *dev, struct opp_table **opp_table);
-void _opp_free(struct dev_pm_opp *opp, struct opp_table *opp_table);
+struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
+void _opp_free(struct dev_pm_opp *opp);
int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
-int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, bool dynamic);
+int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);
+struct opp_table *_add_opp_table(struct device *dev);
#ifdef CONFIG_OF
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev);
--
2.7.1.410.g6faf27b
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