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Merge branch 'pm-opp'

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* pm-opp: (24 commits)
  PM / OPP: Expose _of_get_opp_desc_node as dev_pm_opp API
  PM / OPP: Make _find_opp_table_unlocked() static
  PM / OPP: Update Documentation to remove RCU specific bits
  PM / OPP: Simplify dev_pm_opp_get_max_volt_latency()
  PM / OPP: Simplify _opp_set_availability()
  PM / OPP: Move away from RCU locking
  PM / OPP: Take kref from _find_opp_table()
  PM / OPP: Update OPP users to put reference
  PM / OPP: Add 'struct kref' to struct dev_pm_opp
  PM / OPP: Use dev_pm_opp_get_opp_table() instead of _add_opp_table()
  PM / OPP: Take reference of the OPP table while adding/removing OPPs
  PM / OPP: Return opp_table from dev_pm_opp_set_*() routines
  PM / OPP: Add 'struct kref' to OPP table
  PM / OPP: Add per OPP table mutex
  PM / OPP: Split out part of _add_opp_table() and _remove_opp_table()
  PM / OPP: Don't expose srcu_head to register notifiers
  PM / OPP: Rename dev_pm_opp_get_suspend_opp() and return OPP rate
  PM / OPP: Don't allocate OPP table from _opp_allocate()
  PM / OPP: Rename and split _dev_pm_opp_remove_table()
  PM / OPP: Add light weight _opp_free() routine
  ...
This commit is contained in:
Rafael J. Wysocki 2017-02-20 14:22:50 +01:00
commit 64f758a07a
21 changed files with 599 additions and 985 deletions
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52
Documentation/power/opp.txt
View File

@ -79,22 +79,6 @@ dependent subsystems such as cpufreq are left to the discretion of the SoC
specific framework which uses the OPP library. Similar care needs to be taken
care to refresh the cpufreq table in cases of these operations.
WARNING on OPP List locking mechanism:
-------------------------------------------------
OPP library uses RCU for exclusivity. RCU allows the query functions to operate
in multiple contexts and this synchronization mechanism is optimal for a read
intensive operations on data structure as the OPP library caters to.
To ensure that the data retrieved are sane, the users such as SoC framework
should ensure that the section of code operating on OPP queries are locked
using RCU read locks. The opp_find_freq_{exact,ceil,floor},
opp_get_{voltage, freq, opp_count} fall into this category.
opp_{add,enable,disable} are updaters which use mutex and implement it's own
RCU locking mechanisms. These functions should *NOT* be called under RCU locks
and other contexts that prevent blocking functions in RCU or mutex operations
from working.
2. Initial OPP List Registration
================================
The SoC implementation calls dev_pm_opp_add function iteratively to add OPPs per
@ -137,15 +121,18 @@ functions return the matching pointer representing the opp if a match is
found, else returns error. These errors are expected to be handled by standard
error checks such as IS_ERR() and appropriate actions taken by the caller.
Callers of these functions shall call dev_pm_opp_put() after they have used the
OPP. Otherwise the memory for the OPP will never get freed and result in
memleak.
dev_pm_opp_find_freq_exact - Search for an OPP based on an *exact* frequency and
availability. This function is especially useful to enable an OPP which
is not available by default.
Example: In a case when SoC framework detects a situation where a
higher frequency could be made available, it can use this function to
find the OPP prior to call the dev_pm_opp_enable to actually make it available.
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, 1000000000, false);
rcu_read_unlock();
dev_pm_opp_put(opp);
/* dont operate on the pointer.. just do a sanity check.. */
if (IS_ERR(opp)) {
pr_err("frequency not disabled!\n");
@ -163,9 +150,8 @@ dev_pm_opp_find_freq_floor - Search for an available OPP which is *at most* the
frequency.
Example: To find the highest opp for a device:
freq = ULONG_MAX;
rcu_read_lock();
dev_pm_opp_find_freq_floor(dev, &freq);
rcu_read_unlock();
opp = dev_pm_opp_find_freq_floor(dev, &freq);
dev_pm_opp_put(opp);
dev_pm_opp_find_freq_ceil - Search for an available OPP which is *at least* the
provided frequency. This function is useful while searching for a
@ -173,17 +159,15 @@ dev_pm_opp_find_freq_ceil - Search for an available OPP which is *at least* the
frequency.
Example 1: To find the lowest opp for a device:
freq = 0;
rcu_read_lock();
dev_pm_opp_find_freq_ceil(dev, &freq);
rcu_read_unlock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
dev_pm_opp_put(opp);
Example 2: A simplified implementation of a SoC cpufreq_driver->target:
soc_cpufreq_target(..)
{
/* Do stuff like policy checks etc. */
/* Find the best frequency match for the req */
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (!IS_ERR(opp))
soc_switch_to_freq_voltage(freq);
else
@ -208,9 +192,8 @@ dev_pm_opp_enable - Make a OPP available for operation.
implementation might choose to do something as follows:
if (cur_temp < temp_low_thresh) {
/* Enable 1GHz if it was disabled */
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, 1000000000, false);
rcu_read_unlock();
dev_pm_opp_put(opp);
/* just error check */
if (!IS_ERR(opp))
ret = dev_pm_opp_enable(dev, 1000000000);
@ -224,9 +207,8 @@ dev_pm_opp_disable - Make an OPP to be not available for operation
choose to do something as follows:
if (cur_temp > temp_high_thresh) {
/* Disable 1GHz if it was enabled */
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, 1000000000, true);
rcu_read_unlock();
dev_pm_opp_put(opp);
/* just error check */
if (!IS_ERR(opp))
ret = dev_pm_opp_disable(dev, 1000000000);
@ -249,10 +231,9 @@ dev_pm_opp_get_voltage - Retrieve the voltage represented by the opp pointer.
soc_switch_to_freq_voltage(freq)
{
/* do things */
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
v = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (v)
regulator_set_voltage(.., v);
/* do other things */
@ -266,12 +247,12 @@ dev_pm_opp_get_freq - Retrieve the freq represented by the opp pointer.
{
/* do things.. */
max_freq = ULONG_MAX;
rcu_read_lock();
max_opp = dev_pm_opp_find_freq_floor(dev,&max_freq);
requested_opp = dev_pm_opp_find_freq_ceil(dev,&freq);
if (!IS_ERR(max_opp) && !IS_ERR(requested_opp))
r = soc_test_validity(max_opp, requested_opp);
rcu_read_unlock();
dev_pm_opp_put(max_opp);
dev_pm_opp_put(requested_opp);
/* do other things */
}
soc_test_validity(..)
@ -289,7 +270,6 @@ dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device
soc_notify_coproc_available_frequencies()
{
/* Do things */
rcu_read_lock();
num_available = dev_pm_opp_get_opp_count(dev);
speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
/* populate the table in increasing order */
@ -298,8 +278,8 @@ dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device
speeds[i] = freq;
freq++;
i++;
dev_pm_opp_put(opp);
}
rcu_read_unlock();
soc_notify_coproc(AVAILABLE_FREQs, speeds, num_available);
/* Do other things */

5
arch/arm/mach-omap2/pm.c
View File

@ -130,17 +130,16 @@ static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
freq = clk_get_rate(clk);
clk_put(clk);
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
pr_err("%s: unable to find boot up OPP for vdd_%s\n",
__func__, vdd_name);
goto exit;
}
bootup_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (!bootup_volt) {
pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
__func__, vdd_name);

1021
drivers/base/power/opp/core.c
View File

File diff suppressed because it is too large Load Diff

66
drivers/base/power/opp/cpu.c
View File

@ -42,11 +42,6 @@
*
* WARNING: It is important for the callers to ensure refreshing their copy of
* the table if any of the mentioned functions have been invoked in the interim.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Since we just use the regular accessor functions to access the internal data
* structures, we use RCU read lock inside this function. As a result, users of
* this function DONOT need to use explicit locks for invoking.
*/
int dev_pm_opp_init_cpufreq_table(struct device *dev,
struct cpufreq_frequency_table **table)
@ -56,19 +51,13 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
int i, max_opps, ret = 0;
unsigned long rate;
rcu_read_lock();
max_opps = dev_pm_opp_get_opp_count(dev);
if (max_opps <= 0) {
ret = max_opps ? max_opps : -ENODATA;
goto out;
}
if (max_opps <= 0)
return max_opps ? max_opps : -ENODATA;
freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_ATOMIC);
if (!freq_table) {
ret = -ENOMEM;
goto out;
}
if (!freq_table)
return -ENOMEM;
for (i = 0, rate = 0; i < max_opps; i++, rate++) {
/* find next rate */
@ -83,6 +72,8 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
/* Is Boost/turbo opp ? */
if (dev_pm_opp_is_turbo(opp))
freq_table[i].flags = CPUFREQ_BOOST_FREQ;
dev_pm_opp_put(opp);
}
freq_table[i].driver_data = i;
@ -91,7 +82,6 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
*table = &freq_table[0];
out:
rcu_read_unlock();
if (ret)
kfree(freq_table);
@ -147,12 +137,6 @@ void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
* This removes the OPP tables for CPUs present in the @cpumask.
* This should be used to remove all the OPPs entries associated with
* the cpus in @cpumask.
*
* Locking: The internal opp_table 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_cpumask_remove_table(const struct cpumask *cpumask)
{
@ -169,12 +153,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
* @cpumask.
*
* Returns -ENODEV if OPP table isn't already present.
*
* Locking: The internal opp_table 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.
*/
int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
const struct cpumask *cpumask)
@ -184,13 +162,9 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
struct device *dev;
int cpu, ret = 0;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
ret = PTR_ERR(opp_table);
goto unlock;
}
if (IS_ERR(opp_table))
return PTR_ERR(opp_table);
for_each_cpu(cpu, cpumask) {
if (cpu == cpu_dev->id)
@ -213,8 +187,8 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
/* Mark opp-table as multiple CPUs are sharing it now */
opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
}
unlock:
mutex_unlock(&opp_table_lock);
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
@ -229,12 +203,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
*
* Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
* table's status is access-unknown.
*
* Locking: The internal opp_table 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.
*/
int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
{
@ -242,17 +210,13 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
struct opp_table *opp_table;
int ret = 0;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
ret = PTR_ERR(opp_table);
goto unlock;
}
if (IS_ERR(opp_table))
return PTR_ERR(opp_table);
if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
ret = -EINVAL;
goto unlock;
goto put_opp_table;
}
cpumask_clear(cpumask);
@ -264,8 +228,8 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
cpumask_set_cpu(cpu_dev->id, cpumask);
}
unlock:
mutex_unlock(&opp_table_lock);
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
return ret;
}

154
drivers/base/power/opp/of.c
View File

@ -24,9 +24,11 @@
static struct opp_table *_managed_opp(const struct device_node *np)
{
struct opp_table *opp_table;
struct opp_table *opp_table, *managed_table = NULL;
list_for_each_entry_rcu(opp_table, &opp_tables, node) {
mutex_lock(&opp_table_lock);
list_for_each_entry(opp_table, &opp_tables, node) {
if (opp_table->np == np) {
/*
* Multiple devices can point to the same OPP table and
@ -35,14 +37,18 @@ static struct opp_table *_managed_opp(const struct device_node *np)
* But the OPPs will be considered as shared only if the
* OPP table contains a "opp-shared" property.
*/
if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED)
return opp_table;
if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
_get_opp_table_kref(opp_table);
managed_table = opp_table;
}
return NULL;
break;
}
}
return NULL;
mutex_unlock(&opp_table_lock);
return managed_table;
}
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev)
@ -229,34 +235,28 @@ free_microvolt:
* @dev: device pointer used to lookup OPP table.
*
* Free OPPs created using static entries present in DT.
*
* Locking: The internal opp_table 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 dev_pm_opp_of_remove_table(struct device *dev)
{
_dev_pm_opp_remove_table(dev, false);
_dev_pm_opp_find_and_remove_table(dev, false);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
/* Returns opp descriptor node for a device, caller must do of_node_put() */
static struct device_node *_of_get_opp_desc_node(struct device *dev)
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
{
/*
* TODO: Support for multiple OPP tables.
*
* There should be only ONE phandle present in "operating-points-v2"
* property.
*/
return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
/**
* _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
*
@ -264,12 +264,6 @@ static struct device_node *_of_get_opp_desc_node(struct device *dev)
* opp can be controlled using dev_pm_opp_enable/disable functions and may be
* removed by dev_pm_opp_remove.
*
* Locking: The internal opp_table 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.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
@ -278,22 +272,17 @@ 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 = _allocate_opp(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) {
@ -327,8 +316,12 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
goto free_opp;
ret = _opp_add(dev, new_opp, opp_table);
if (ret)
if (ret) {
/* Don't return error for duplicate OPPs */
if (ret == -EBUSY)
ret = 0;
goto free_opp;
}
/* OPP to select on device suspend */
if (of_property_read_bool(np, "opp-suspend")) {
@ -345,8 +338,6 @@ 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,
@ -356,13 +347,12 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
return 0;
free_opp:
_opp_remove(opp_table, new_opp, false);
unlock:
mutex_unlock(&opp_table_lock);
_opp_free(new_opp);
return ret;
}
@ -373,41 +363,35 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
struct opp_table *opp_table;
int ret = 0, count = 0;
mutex_lock(&opp_table_lock);
opp_table = _managed_opp(opp_np);
if (opp_table) {
/* OPPs are already managed */
if (!_add_opp_dev(dev, opp_table))
ret = -ENOMEM;
mutex_unlock(&opp_table_lock);
return ret;
goto put_opp_table;
}
mutex_unlock(&opp_table_lock);
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return -ENOMEM;
/* 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);
goto free_table;
_dev_pm_opp_remove_table(opp_table, dev, false);
goto put_opp_table;
}
}
/* 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);
goto free_table;
if (WARN_ON(!count)) {
ret = -ENOENT;
goto put_opp_table;
}
opp_table->np = opp_np;
@ -416,12 +400,8 @@ 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;
free_table:
dev_pm_opp_of_remove_table(dev);
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
@ -429,9 +409,10 @@ free_table:
/* 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;
int nr, ret = 0;
prop = of_find_property(dev->of_node, "operating-points", NULL);
if (!prop)
@ -449,18 +430,27 @@ static int _of_add_opp_table_v1(struct device *dev)
return -EINVAL;
}
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return -ENOMEM;
val = prop->value;
while (nr) {
unsigned long freq = be32_to_cpup(val++) * 1000;
unsigned long volt = be32_to_cpup(val++);
if (_opp_add_v1(dev, freq, volt, false))
dev_warn(dev, "%s: Failed to add OPP %ld\n",
__func__, freq);
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_remove_table(opp_table, dev, false);
break;
}
nr -= 2;
}
return 0;
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
/**
@ -469,12 +459,6 @@ static int _of_add_opp_table_v1(struct device *dev)
*
* Register the initial OPP table with the OPP library for given device.
*
* Locking: The internal opp_table 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.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
@ -495,7 +479,7 @@ int dev_pm_opp_of_add_table(struct device *dev)
* OPPs have two version of bindings now. The older one is deprecated,
* try for the new binding first.
*/
opp_np = _of_get_opp_desc_node(dev);
opp_np = dev_pm_opp_of_get_opp_desc_node(dev);
if (!opp_np) {
/*
* Try old-deprecated bindings for backward compatibility with
@ -519,12 +503,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
*
* This removes the OPP tables for CPUs present in the @cpumask.
* This should be used only to remove static entries created from DT.
*
* Locking: The internal opp_table 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_of_cpumask_remove_table(const struct cpumask *cpumask)
{
@ -537,12 +515,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
* @cpumask: cpumask for which OPP table needs to be added.
*
* This adds the OPP tables for CPUs present in the @cpumask.
*
* Locking: The internal opp_table 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.
*/
int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
{
@ -590,12 +562,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
* This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
*
* Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
*
* Locking: The internal opp_table 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.
*/
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
struct cpumask *cpumask)
@ -605,7 +571,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
int cpu, ret = 0;
/* Get OPP descriptor node */
np = _of_get_opp_desc_node(cpu_dev);
np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
if (!np) {
dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
return -ENOENT;
@ -630,7 +596,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
}
/* Get OPP descriptor node */
tmp_np = _of_get_opp_desc_node(tcpu_dev);
tmp_np = dev_pm_opp_of_get_opp_desc_node(tcpu_dev);
if (!tmp_np) {
dev_err(tcpu_dev, "%s: Couldn't find opp node.\n",
__func__);

40
drivers/base/power/opp/opp.h
View File

@ -16,11 +16,11 @@
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/limits.h>
#include <linux/pm_opp.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/notifier.h>
struct clk;
struct regulator;
@ -51,11 +51,9 @@ extern struct list_head opp_tables;
* @node: opp table node. The nodes are maintained throughout the lifetime
* of boot. It is expected only an optimal set of OPPs are
* added to the library by the SoC framework.
* RCU usage: opp table is traversed with RCU locks. node
* modification is possible realtime, hence the modifications
* are protected by the opp_table_lock for integrity.
* IMPORTANT: the opp nodes should be maintained in increasing
* order.
* @kref: for reference count of the OPP.
* @available: true/false - marks if this OPP as available or not
* @dynamic: not-created from static DT entries.
* @turbo: true if turbo (boost) OPP
@ -65,7 +63,6 @@ extern struct list_head opp_tables;
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
* frequency from any other OPP's frequency.
* @opp_table: points back to the opp_table struct this opp belongs to
* @rcu_head: RCU callback head used for deferred freeing
* @np: OPP's device node.
* @dentry: debugfs dentry pointer (per opp)
*
@ -73,6 +70,7 @@ extern struct list_head opp_tables;
*/
struct dev_pm_opp {
struct list_head node;
struct kref kref;
bool available;
bool dynamic;
@ -85,7 +83,6 @@ struct dev_pm_opp {
unsigned long clock_latency_ns;
struct opp_table *opp_table;
struct rcu_head rcu_head;
struct device_node *np;
@ -98,7 +95,6 @@ struct dev_pm_opp {
* struct opp_device - devices managed by 'struct opp_table'
* @node: list node
* @dev: device to which the struct object belongs
* @rcu_head: RCU callback head used for deferred freeing
* @dentry: debugfs dentry pointer (per device)
*
* This is an internal data structure maintaining the devices that are managed
@ -107,7 +103,6 @@ struct dev_pm_opp {
struct opp_device {
struct list_head node;
const struct device *dev;
struct rcu_head rcu_head;
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
@ -125,12 +120,11 @@ enum opp_table_access {
* @node: table node - contains the devices with OPPs that
* have been registered. Nodes once added are not modified in this
* table.
* RCU usage: nodes are not modified in the table of opp_table,
* however addition is possible and is secured by opp_table_lock
* @srcu_head: notifier head to notify the OPP availability changes.
* @rcu_head: RCU callback head used for deferred freeing
* @head: notifier head to notify the OPP availability changes.
* @dev_list: list of devices that share these OPPs
* @opp_list: table of opps
* @kref: for reference count of the table.
* @lock: mutex protecting the opp_list.
* @np: struct device_node pointer for opp's DT node.
* @clock_latency_ns_max: Max clock latency in nanoseconds.
* @shared_opp: OPP is shared between multiple devices.
@ -151,18 +145,15 @@ enum opp_table_access {
* This is an internal data structure maintaining the link to opps attached to
* a device. This structure is not meant to be shared to users as it is
* meant for book keeping and private to OPP library.
*
* Because the opp structures can be used from both rcu and srcu readers, we
* need to wait for the grace period of both of them before freeing any
* resources. And so we have used kfree_rcu() from within call_srcu() handlers.
*/
struct opp_table {
struct list_head node;
struct srcu_notifier_head srcu_head;
struct rcu_head rcu_head;
struct blocking_notifier_head head;
struct list_head dev_list;
struct list_head opp_list;
struct kref kref;
struct mutex lock;
struct device_node *np;
unsigned long clock_latency_ns_max;
@ -190,14 +181,17 @@ struct opp_table {
};
/* Routines internal to opp core */
void _get_opp_table_kref(struct opp_table *opp_table);
struct opp_table *_find_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 device *dev, bool remove_all);
struct dev_pm_opp *_allocate_opp(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 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);
void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp, bool notify);
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);

17
drivers/clk/tegra/clk-dfll.c
View File

@ -633,16 +633,12 @@ static int find_lut_index_for_rate(struct tegra_dfll *td, unsigned long rate)
struct dev_pm_opp *opp;
int i, uv;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
uv = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
uv = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
for (i = 0; i < td->i2c_lut_size; i++) {
if (regulator_list_voltage(td->vdd_reg, td->i2c_lut[i]) == uv)
@ -1440,8 +1436,6 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
struct dev_pm_opp *opp;
int lut;
rcu_read_lock();
rate = ULONG_MAX;
opp = dev_pm_opp_find_freq_floor(td->soc->dev, &rate);
if (IS_ERR(opp)) {
@ -1449,6 +1443,7 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
goto out;
}
v_max = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
v = td->soc->cvb->min_millivolts * 1000;
lut = find_vdd_map_entry_exact(td, v);
@ -1465,6 +1460,8 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
if (v_opp <= td->soc->cvb->min_millivolts * 1000)
td->dvco_rate_min = dev_pm_opp_get_freq(opp);
dev_pm_opp_put(opp);
for (;;) {
v += max(1, (v_max - v) / (MAX_DFLL_VOLTAGES - j));
if (v >= v_opp)
@ -1496,8 +1493,6 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
ret = 0;
out:
rcu_read_unlock();
return ret;
}

7
drivers/cpufreq/cpufreq-dt.c
View File

@ -148,7 +148,6 @@ static int cpufreq_init(struct cpufreq_policy *policy)
struct private_data *priv;
struct device *cpu_dev;
struct clk *cpu_clk;
struct dev_pm_opp *suspend_opp;
unsigned int transition_latency;
bool fallback = false;
const char *name;
@ -252,11 +251,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
policy->driver_data = priv;
policy->clk = cpu_clk;
rcu_read_lock();
suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev);
if (suspend_opp)
policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
rcu_read_unlock();
policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
ret = cpufreq_table_validate_and_show(policy, freq_table);
if (ret) {

5
drivers/cpufreq/exynos5440-cpufreq.c
View File

@ -118,12 +118,10 @@ static int init_div_table(void)
unsigned int tmp, clk_div, ema_div, freq, volt_id;
struct dev_pm_opp *opp;
rcu_read_lock();
cpufreq_for_each_entry(pos, freq_tbl) {
opp = dev_pm_opp_find_freq_exact(dvfs_info->dev,
pos->frequency * 1000, true);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dvfs_info->dev,
"failed to find valid OPP for %u KHZ\n",
pos->frequency);
@ -140,6 +138,7 @@ static int init_div_table(void)
/* Calculate EMA */
volt_id = dev_pm_opp_get_voltage(opp);
volt_id = (MAX_VOLTAGE - volt_id) / VOLTAGE_STEP;
if (volt_id < PMIC_HIGH_VOLT) {
ema_div = (CPUEMA_HIGH << P0_7_CPUEMA_SHIFT) |
@ -157,9 +156,9 @@ static int init_div_table(void)
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 *
(pos - freq_tbl));
dev_pm_opp_put(opp);
}
rcu_read_unlock();
return 0;
}

10
drivers/cpufreq/imx6q-cpufreq.c
View File

@ -53,16 +53,15 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
freq_hz = new_freq * 1000;
old_freq = clk_get_rate(arm_clk) / 1000;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(cpu_dev, "failed to find OPP for %ld\n", freq_hz);
return PTR_ERR(opp);
}
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
volt_old = regulator_get_voltage(arm_reg);
dev_dbg(cpu_dev, "%u MHz, %ld mV --> %u MHz, %ld mV\n",
@ -321,14 +320,15 @@ soc_opp_out:
* freq_table initialised from OPP is therefore sorted in the
* same order.
*/
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(cpu_dev,
freq_table[0].frequency * 1000, true);
min_volt = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
opp = dev_pm_opp_find_freq_exact(cpu_dev,
freq_table[--num].frequency * 1000, true);
max_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
ret = regulator_set_voltage_time(arm_reg, min_volt, max_volt);
if (ret > 0)
transition_latency += ret * 1000;

8
drivers/cpufreq/mt8173-cpufreq.c
View File

@ -232,16 +232,14 @@ static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
freq_hz = freq_table[index].frequency * 1000;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
if (IS_ERR(opp)) {
rcu_read_unlock();
pr_err("cpu%d: failed to find OPP for %ld\n",
policy->cpu, freq_hz);
return PTR_ERR(opp);
}
vproc = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
/*
* If the new voltage or the intermediate voltage is higher than the
@ -411,16 +409,14 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
/* Search a safe voltage for intermediate frequency. */
rate = clk_get_rate(inter_clk);
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
if (IS_ERR(opp)) {
rcu_read_unlock();
pr_err("failed to get intermediate opp for cpu%d\n", cpu);
ret = PTR_ERR(opp);
goto out_free_opp_table;
}
info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
info->cpu_dev = cpu_dev;
info->proc_reg = proc_reg;

4
drivers/cpufreq/omap-cpufreq.c
View File

@ -63,16 +63,14 @@ static int omap_target(struct cpufreq_policy *policy, unsigned int index)
freq = ret;
if (mpu_reg) {
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(mpu_dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
__func__, new_freq);
return -EINVAL;
}
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
tol = volt * OPP_TOLERANCE / 100;
volt_old = regulator_get_voltage(mpu_reg);
}

13
drivers/cpufreq/sti-cpufreq.c
View File

@ -160,6 +160,7 @@ static int sti_cpufreq_set_opp_info(void)
int pcode, substrate, major, minor;
int ret;
char name[MAX_PCODE_NAME_LEN];
struct opp_table *opp_table;
reg_fields = sti_cpufreq_match();
if (!reg_fields) {
@ -211,20 +212,20 @@ use_defaults:
snprintf(name, MAX_PCODE_NAME_LEN, "pcode%d", pcode);
ret = dev_pm_opp_set_prop_name(dev, name);
if (ret) {
opp_table = dev_pm_opp_set_prop_name(dev, name);
if (IS_ERR(opp_table)) {
dev_err(dev, "Failed to set prop name\n");
return ret;
return PTR_ERR(opp_table);
}
version[0] = BIT(major);
version[1] = BIT(minor);
version[2] = BIT(substrate);
ret = dev_pm_opp_set_supported_hw(dev, version, VERSION_ELEMENTS);
if (ret) {
opp_table = dev_pm_opp_set_supported_hw(dev, version, VERSION_ELEMENTS);
if (IS_ERR(opp_table)) {
dev_err(dev, "Failed to set supported hardware\n");
return ret;
return PTR_ERR(opp_table);
}
dev_dbg(dev, "pcode: %d major: %d minor: %d substrate: %d\n",

40
drivers/devfreq/devfreq.c
View File

@ -111,18 +111,16 @@ static void devfreq_set_freq_table(struct devfreq *devfreq)
return;
}
rcu_read_lock();
for (i = 0, freq = 0; i < profile->max_state; i++, freq++) {
opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq);
if (IS_ERR(opp)) {
devm_kfree(devfreq->dev.parent, profile->freq_table);
profile->max_state = 0;
rcu_read_unlock();
return;
}
dev_pm_opp_put(opp);
profile->freq_table[i] = freq;
}
rcu_read_unlock();
}
/**
@ -1112,17 +1110,16 @@ static ssize_t available_frequencies_show(struct device *d,
ssize_t count = 0;
unsigned long freq = 0;
rcu_read_lock();
do {
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp))
break;
dev_pm_opp_put(opp);
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
"%lu ", freq);
freq++;
} while (1);
rcu_read_unlock();
/* Truncate the trailing space */
if (count)
@ -1224,11 +1221,8 @@ subsys_initcall(devfreq_init);
* @freq: The frequency given to target function
* @flags: Flags handed from devfreq framework.
*
* Locking: This function must be called under rcu_read_lock(). opp is a rcu
* protected pointer. The reason for the same is that the opp pointer which is
* returned will remain valid for use with opp_get_{voltage, freq} only while
* under the locked area. The pointer returned must be used prior to unlocking
* with rcu_read_unlock() to maintain the integrity of the pointer.
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq,
@ -1265,18 +1259,7 @@ EXPORT_SYMBOL(devfreq_recommended_opp);
*/
int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq)
{
struct srcu_notifier_head *nh;
int ret = 0;
rcu_read_lock();
nh = dev_pm_opp_get_notifier(dev);
if (IS_ERR(nh))
ret = PTR_ERR(nh);
rcu_read_unlock();
if (!ret)
ret = srcu_notifier_chain_register(nh, &devfreq->nb);
return ret;
return dev_pm_opp_register_notifier(dev, &devfreq->nb);
}
EXPORT_SYMBOL(devfreq_register_opp_notifier);
@ -1292,18 +1275,7 @@ EXPORT_SYMBOL(devfreq_register_opp_notifier);
*/
int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
{
struct srcu_notifier_head *nh;
int ret = 0;
rcu_read_lock();
nh = dev_pm_opp_get_notifier(dev);
if (IS_ERR(nh))
ret = PTR_ERR(nh);
rcu_read_unlock();
if (!ret)
ret = srcu_notifier_chain_unregister(nh, &devfreq->nb);
return ret;
return dev_pm_opp_unregister_notifier(dev, &devfreq->nb);
}
EXPORT_SYMBOL(devfreq_unregister_opp_notifier);

14
drivers/devfreq/exynos-bus.c
View File

@ -103,18 +103,17 @@ static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
int ret = 0;
/* Get new opp-bus instance according to new bus clock */
rcu_read_lock();
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
dev_err(dev, "failed to get recommended opp instance\n");
rcu_read_unlock();
return PTR_ERR(new_opp);
}
new_freq = dev_pm_opp_get_freq(new_opp);
new_volt = dev_pm_opp_get_voltage(new_opp);
dev_pm_opp_put(new_opp);
old_freq = bus->curr_freq;
rcu_read_unlock();
if (old_freq == new_freq)
return 0;
@ -214,17 +213,16 @@ static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
int ret = 0;
/* Get new opp-bus instance according to new bus clock */
rcu_read_lock();
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
dev_err(dev, "failed to get recommended opp instance\n");
rcu_read_unlock();
return PTR_ERR(new_opp);
}
new_freq = dev_pm_opp_get_freq(new_opp);
dev_pm_opp_put(new_opp);
old_freq = bus->curr_freq;
rcu_read_unlock();
if (old_freq == new_freq)
return 0;
@ -358,16 +356,14 @@ static int exynos_bus_parse_of(struct device_node *np,
rate = clk_get_rate(bus->clk);
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &rate, 0);
if (IS_ERR(opp)) {
dev_err(dev, "failed to find dev_pm_opp\n");
rcu_read_unlock();
ret = PTR_ERR(opp);
goto err_opp;
}
bus->curr_freq = dev_pm_opp_get_freq(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
return 0;

4
drivers/devfreq/governor_passive.c
View File

@ -59,14 +59,14 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
* list of parent device. Because in this case, *freq is temporary
* value which is decided by ondemand governor.
*/
rcu_read_lock();
opp = devfreq_recommended_opp(parent_devfreq->dev.parent, freq, 0);
rcu_read_unlock();
if (IS_ERR(opp)) {
ret = PTR_ERR(opp);
goto out;
}
dev_pm_opp_put(opp);
/*
* Get the OPP table's index of decided freqeuncy by governor
* of parent device.

16
drivers/devfreq/rk3399_dmc.c
View File

@ -91,17 +91,13 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
unsigned long target_volt, target_rate;
int err;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
target_rate = dev_pm_opp_get_freq(opp);
target_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (dmcfreq->rate == target_rate)
return 0;
@ -422,15 +418,13 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
data->rate = clk_get_rate(data->dmc_clk);
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &data->rate, 0);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
data->rate = dev_pm_opp_get_freq(opp);
data->volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
rk3399_devfreq_dmc_profile.initial_freq = data->rate;

4
drivers/devfreq/tegra-devfreq.c
View File

@ -487,15 +487,13 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
struct dev_pm_opp *opp;
unsigned long rate = *freq * KHZ;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &rate, flags);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dev, "Failed to find opp for %lu KHz\n", *freq);
return PTR_ERR(opp);
}
rate = dev_pm_opp_get_freq(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
clk_set_min_rate(tegra->emc_clock, rate);
clk_set_rate(tegra->emc_clock, 0);

11
drivers/thermal/cpu_cooling.c
View File

@ -297,8 +297,6 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
if (!power_table)
return -ENOMEM;
rcu_read_lock();
for (freq = 0, i = 0;
opp = dev_pm_opp_find_freq_ceil(dev, &freq), !IS_ERR(opp);
freq++, i++) {
@ -306,13 +304,13 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
u64 power;
if (i >= num_opps) {
rcu_read_unlock();
ret = -EAGAIN;
goto free_power_table;
}
freq_mhz = freq / 1000000;
voltage_mv = dev_pm_opp_get_voltage(opp) / 1000;
dev_pm_opp_put(opp);
/*
* Do the multiplication with MHz and millivolt so as
@ -328,8 +326,6 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
power_table[i].power = power;
}
rcu_read_unlock();
if (i != num_opps) {
ret = PTR_ERR(opp);
goto free_power_table;
@ -433,13 +429,10 @@ static int get_static_power(struct cpufreq_cooling_device *cpufreq_device,
return 0;
}
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz,
true);
voltage = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(cpufreq_device->cpu_dev,

15
drivers/thermal/devfreq_cooling.c
View File

@ -113,15 +113,15 @@ static int partition_enable_opps(struct devfreq_cooling_device *dfc,
unsigned int freq = dfc->freq_table[i];
bool want_enable = i >= cdev_state ? true : false;
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, freq, !want_enable);
rcu_read_unlock();
if (PTR_ERR(opp) == -ERANGE)
continue;
else if (IS_ERR(opp))
return PTR_ERR(opp);
dev_pm_opp_put(opp);
if (want_enable)
ret = dev_pm_opp_enable(dev, freq);
else
@ -221,15 +221,12 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
if (!dfc->power_ops->get_static_power)
return 0;
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, freq, true);
if (IS_ERR(opp) && (PTR_ERR(opp) == -ERANGE))
opp = dev_pm_opp_find_freq_exact(dev, freq, false);
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
rcu_read_unlock();
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(dev,
@ -412,18 +409,14 @@ static int devfreq_cooling_gen_tables(struct devfreq_cooling_device *dfc)
unsigned long power_dyn, voltage;
struct dev_pm_opp *opp;
rcu_read_lock();
opp = dev_pm_opp_find_freq_floor(dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
ret = PTR_ERR(opp);
goto free_tables;
}
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
rcu_read_unlock();
dev_pm_opp_put(opp);
if (dfc->power_ops) {
power_dyn = get_dynamic_power(dfc, freq, voltage);

78
include/linux/pm_opp.h
View File

@ -78,6 +78,9 @@ struct dev_pm_set_opp_data {
#if defined(CONFIG_PM_OPP)
struct opp_table *dev_pm_opp_get_opp_table(struct device *dev);
void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
@ -88,7 +91,7 @@ int dev_pm_opp_get_opp_count(struct device *dev);
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);
unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev);
struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);
unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev);
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq,
@ -99,6 +102,7 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
unsigned long *freq);
void dev_pm_opp_put(struct dev_pm_opp *opp);
int dev_pm_opp_add(struct device *dev, unsigned long freq,
unsigned long u_volt);
@ -108,22 +112,30 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);
int dev_pm_opp_disable(struct device *dev, unsigned long freq);
struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions,
unsigned int count);
void dev_pm_opp_put_supported_hw(struct device *dev);
int dev_pm_opp_set_prop_name(struct device *dev, const char *name);
void dev_pm_opp_put_prop_name(struct device *dev);
int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count);
void dev_pm_opp_put_supported_hw(struct opp_table *opp_table);
struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name);
void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
void dev_pm_opp_put_regulators(struct opp_table *opp_table);
int dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
void dev_pm_opp_register_put_opp_helper(struct device *dev);
struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table);
int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask);
int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
void dev_pm_opp_remove_table(struct device *dev);
void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
#else
static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
{
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_put_opp_table(struct opp_table *opp_table) {}
static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
{
return 0;
@ -159,9 +171,9 @@ static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device
return 0;
}
static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
static inline unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
{
return NULL;
return 0;
}
static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
@ -182,6 +194,8 @@ static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_put(struct dev_pm_opp *opp) {}
static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
unsigned long u_volt)
{
@ -202,35 +216,39 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
return 0;
}
static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
struct device *dev)
static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
{
return -ENOTSUPP;
}
static inline int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb)
{
return -ENOTSUPP;
}
static inline struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
const u32 *versions,
unsigned int count)
{
return ERR_PTR(-ENOTSUPP);
}
static inline int dev_pm_opp_set_supported_hw(struct device *dev,
const u32 *versions,
unsigned int count)
{
return -ENOTSUPP;
}
static inline void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) {}
static inline void dev_pm_opp_put_supported_hw(struct device *dev) {}
static inline int dev_pm_opp_register_set_opp_helper(struct device *dev,
static inline struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
int (*set_opp)(struct dev_pm_set_opp_data *data))
{
return -ENOTSUPP;
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_register_put_opp_helper(struct device *dev) {}
static inline void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table) {}
static inline int dev_pm_opp_set_prop_name(struct device *dev, const char *name)
static inline struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
{
return -ENOTSUPP;
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_put_prop_name(struct device *dev) {}
static inline void dev_pm_opp_put_prop_name(struct opp_table *opp_table) {}
static inline struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count)
{
@ -270,6 +288,7 @@ void dev_pm_opp_of_remove_table(struct device *dev);
int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask);
void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask);
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
#else
static inline int dev_pm_opp_of_add_table(struct device *dev)
{
@ -293,6 +312,11 @@ static inline int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct
{
return -ENOTSUPP;
}
static inline struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
{
return NULL;
}
#endif
#endif /* __LINUX_OPP_H__ */