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Commit 2c2709dc authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki
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PM / OPP: Rename structures for clarity 

Stephen pointed out recently, that few structures always confuse him as
they aren't named properly. And this patch tries to address that:

Names are updated as:
- device_opp or dev_opp -> opp_table
- dev_opp_list -> opp_tables
- dev_opp_list_lock -> opp_table_lock
- device_list_opp -> opp_device (it was never a list, but a structure)
- list_dev -> opp_dev
- And similar changes in comments and function names as well.

This also fixes checkpatch warnings that were generated with this patch.

No functional changes.
Suggested-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent a5da6447
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Showing with 461 additions and 459 deletions
drivers/base/power/opp/core.c
View file @ 2c2709dc
......@@ -25,40 +25,40 @@
#include "opp.h"
/*
* The root of the list of all devices. All device_opp structures branch off
* from here, with each device_opp containing the list of opp it supports in
* The root of the list of all opp-tables. All opp_table structures branch off
* from here, with each opp_table containing the list of opps it supports in
* various states of availability.
*/
static LIST_HEAD(dev_opp_list);
static LIST_HEAD(opp_tables);
/* Lock to allow exclusive modification to the device and opp lists */
DEFINE_MUTEX(dev_opp_list_lock);
DEFINE_MUTEX(opp_table_lock);
#define opp_rcu_lockdep_assert() \
do { \
RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \
!lockdep_is_held(&dev_opp_list_lock), \
"Missing rcu_read_lock() or " \
"dev_opp_list_lock protection"); \
!lockdep_is_held(&opp_table_lock), \
"Missing rcu_read_lock() or " \
"opp_table_lock protection"); \
} while (0)
static struct device_list_opp *_find_list_dev(const struct device *dev,
struct device_opp *dev_opp)
static struct opp_device *_find_opp_dev(const struct device *dev,
struct opp_table *opp_table)
{
struct device_list_opp *list_dev;
struct opp_device *opp_dev;
list_for_each_entry(list_dev, &dev_opp->dev_list, node)
if (list_dev->dev == dev)
return list_dev;
list_for_each_entry(opp_dev, &opp_table->dev_list, node)
if (opp_dev->dev == dev)
return opp_dev;
return NULL;
}
static struct device_opp *_managed_opp(const struct device_node *np)
static struct opp_table *_managed_opp(const struct device_node *np)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
list_for_each_entry_rcu(dev_opp, &dev_opp_list, node) {
if (dev_opp->np == np) {
list_for_each_entry_rcu(opp_table, &opp_tables, node) {
if (opp_table->np == np) {
/*
* Multiple devices can point to the same OPP table and
* so will have same node-pointer, np.
......@@ -66,7 +66,7 @@ static struct device_opp *_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.
*/
return dev_opp->shared_opp ? dev_opp : NULL;
return opp_table->shared_opp ? opp_table : NULL;
}
}
......@@ -74,24 +74,24 @@ static struct device_opp *_managed_opp(const struct device_node *np)
}
/**
* _find_device_opp() - find device_opp struct using device pointer
* @dev: device pointer used to lookup device OPPs
* _find_opp_table() - find opp_table struct using device pointer
* @dev: device pointer used to lookup OPP table
*
* Search list of device OPPs for one containing matching device. Does a RCU
* reader operation to grab the pointer needed.
* Search OPP table for one containing matching device. Does a RCU reader
* operation to grab the pointer needed.
*
* Return: pointer to 'struct device_opp' if found, otherwise -ENODEV or
* Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
* -EINVAL based on type of error.
*
* Locking: For readers, this function must be called under rcu_read_lock().
* device_opp is a RCU protected pointer, which means that device_opp is valid
* 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 dev_opp_list_lock held.
* For Writers, this function must be called with opp_table_lock held.
*/
struct device_opp *_find_device_opp(struct device *dev)
struct opp_table *_find_opp_table(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
opp_rcu_lockdep_assert();
......@@ -100,9 +100,9 @@ struct device_opp *_find_device_opp(struct device *dev)
return ERR_PTR(-EINVAL);
}
list_for_each_entry_rcu(dev_opp, &dev_opp_list, node)
if (_find_list_dev(dev, dev_opp))
return dev_opp;
list_for_each_entry_rcu(opp_table, &opp_tables, node)
if (_find_opp_dev(dev, opp_table))
return opp_table;
return ERR_PTR(-ENODEV);
}
......@@ -215,16 +215,16 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
*/
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
unsigned long clock_latency_ns;
rcu_read_lock();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp))
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
clock_latency_ns = 0;
else
clock_latency_ns = dev_opp->clock_latency_ns_max;
clock_latency_ns = opp_table->clock_latency_ns_max;
rcu_read_unlock();
return clock_latency_ns;
......@@ -241,7 +241,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
*/
unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *opp;
struct regulator *reg;
unsigned long latency_ns = 0;
......@@ -250,13 +250,13 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
rcu_read_lock();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
rcu_read_unlock();
return 0;
}
reg = dev_opp->regulator;
reg = opp_table->regulator;
if (IS_ERR(reg)) {
/* Regulator may not be required for device */
if (reg)
......@@ -266,7 +266,7 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
return 0;
}
list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {
list_for_each_entry_rcu(opp, &opp_table->opp_list, node) {
if (!opp->available)
continue;
......@@ -279,7 +279,7 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
rcu_read_unlock();
/*
* The caller needs to ensure that dev_opp (and hence the regulator)
* The caller needs to ensure that opp_table (and hence the regulator)
* isn't freed, while we are executing this routine.
*/
ret = regulator_set_voltage_time(reg, min_uV, max_uV);
......@@ -322,21 +322,21 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
*/
struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
opp_rcu_lockdep_assert();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp) || !dev_opp->suspend_opp ||
!dev_opp->suspend_opp->available)
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table) || !opp_table->suspend_opp ||
!opp_table->suspend_opp->available)
return NULL;
return dev_opp->suspend_opp;
return opp_table->suspend_opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp);
/**
* dev_pm_opp_get_opp_count() - Get number of opps available in the opp list
* dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
* @dev: device for which we do this operation
*
* Return: This function returns the number of available opps if there are any,
......@@ -346,21 +346,21 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp);
*/
int dev_pm_opp_get_opp_count(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp;
int count = 0;
rcu_read_lock();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
count = PTR_ERR(dev_opp);
dev_err(dev, "%s: device OPP not found (%d)\n",
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
count = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n",
__func__, count);
goto out_unlock;
}
list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available)
count++;
}
......@@ -377,7 +377,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
* @freq: frequency to search for
* @available: true/false - match for available opp
*
* Return: Searches for exact match in the opp list and returns pointer to the
* Return: Searches for exact match in the opp table and returns pointer to the
* matching opp if found, else returns ERR_PTR in case of error and should
* be handled using IS_ERR. Error return values can be:
* EINVAL: for bad pointer
......@@ -401,19 +401,20 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq,
bool available)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
opp_rcu_lockdep_assert();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
int r = PTR_ERR(dev_opp);
dev_err(dev, "%s: device OPP not found (%d)\n", __func__, r);
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
int r = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
return ERR_PTR(r);
}
list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available == available &&
temp_opp->rate == freq) {
opp = temp_opp;
......@@ -449,7 +450,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
unsigned long *freq)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
opp_rcu_lockdep_assert();
......@@ -459,11 +460,11 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
return ERR_PTR(-EINVAL);
}
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp))
return ERR_CAST(dev_opp);
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return ERR_CAST(opp_table);
list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available && temp_opp->rate >= *freq) {
opp = temp_opp;
*freq = opp->rate;
......@@ -499,7 +500,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
unsigned long *freq)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
opp_rcu_lockdep_assert();
......@@ -509,11 +510,11 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
return ERR_PTR(-EINVAL);
}
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp))
return ERR_CAST(dev_opp);
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return ERR_CAST(opp_table);
list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available) {
/* go to the next node, before choosing prev */
if (temp_opp->rate > *freq)
......@@ -530,24 +531,24 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
/*
* The caller needs to ensure that device_opp (and hence the clk) isn't freed,
* The caller needs to ensure that opp_table (and hence the clk) isn't freed,
* while clk returned here is used.
*/
static struct clk *_get_opp_clk(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct clk *clk;
rcu_read_lock();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "%s: device opp doesn't exist\n", __func__);
clk = ERR_CAST(dev_opp);
clk = ERR_CAST(opp_table);
goto unlock;
}
clk = dev_opp->clk;
clk = opp_table->clk;
if (IS_ERR(clk))
dev_err(dev, "%s: No clock available for the device\n",
__func__);
......@@ -594,7 +595,7 @@ static int _set_opp_voltage(struct device *dev, struct regulator *reg,
*/
int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *old_opp, *opp;
struct regulator *reg;
struct clk *clk;
......@@ -628,11 +629,11 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
rcu_read_lock();
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "%s: device opp doesn't exist\n", __func__);
rcu_read_unlock();
return PTR_ERR(dev_opp);
return PTR_ERR(opp_table);
}
old_opp = dev_pm_opp_find_freq_ceil(dev, &old_freq);
......@@ -658,7 +659,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
u_volt_min = opp->u_volt_min;
u_volt_max = opp->u_volt_max;
reg = dev_opp->regulator;
reg = opp_table->regulator;
rcu_read_unlock();
......@@ -705,81 +706,81 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
/* List-dev Helpers */
static void _kfree_list_dev_rcu(struct rcu_head *head)
/* OPP-dev Helpers */
static void _kfree_opp_dev_rcu(struct rcu_head *head)
{
struct device_list_opp *list_dev;
struct opp_device *opp_dev;
list_dev = container_of(head, struct device_list_opp, rcu_head);
kfree_rcu(list_dev, rcu_head);
opp_dev = container_of(head, struct opp_device, rcu_head);
kfree_rcu(opp_dev, rcu_head);
}
static void _remove_list_dev(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
static void _remove_opp_dev(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
opp_debug_unregister(list_dev, dev_opp);
list_del(&list_dev->node);
call_srcu(&dev_opp->srcu_head.srcu, &list_dev->rcu_head,
_kfree_list_dev_rcu);
opp_debug_unregister(opp_dev, opp_table);
list_del(&opp_dev->node);
call_srcu(&opp_table->srcu_head.srcu, &opp_dev->rcu_head,
_kfree_opp_dev_rcu);
}
struct device_list_opp *_add_list_dev(const struct device *dev,
struct device_opp *dev_opp)
struct opp_device *_add_opp_dev(const struct device *dev,
struct opp_table *opp_table)
{
struct device_list_opp *list_dev;
struct opp_device *opp_dev;
int ret;
list_dev = kzalloc(sizeof(*list_dev), GFP_KERNEL);
if (!list_dev)
opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
if (!opp_dev)
return NULL;
/* Initialize list-dev */
list_dev->dev = dev;
list_add_rcu(&list_dev->node, &dev_opp->dev_list);
/* Initialize opp-dev */
opp_dev->dev = dev;
list_add_rcu(&opp_dev->node, &opp_table->dev_list);
/* Create debugfs entries for the dev_opp */
ret = opp_debug_register(list_dev, dev_opp);
/* Create debugfs entries for the opp_table */
ret = opp_debug_register(opp_dev, opp_table);
if (ret)
dev_err(dev, "%s: Failed to register opp debugfs (%d)\n",
__func__, ret);
return list_dev;
return opp_dev;
}
/**
* _add_device_opp() - Find device OPP table or allocate a new one
* _add_opp_table() - Find OPP table or allocate a new one
* @dev: device for which we do this operation
*
* It tries to find an existing table first, if it couldn't find one, it
* allocates a new OPP table and returns that.
*
* Return: valid device_opp pointer if success, else NULL.
* Return: valid opp_table pointer if success, else NULL.
*/
static struct device_opp *_add_device_opp(struct device *dev)
static struct opp_table *_add_opp_table(struct device *dev)
{
struct device_opp *dev_opp;
struct device_list_opp *list_dev;
struct opp_table *opp_table;
struct opp_device *opp_dev;
struct device_node *np;
int ret;
/* Check for existing list for 'dev' first */
dev_opp = _find_device_opp(dev);
if (!IS_ERR(dev_opp))
return dev_opp;
/* Check for existing table for 'dev' first */
opp_table = _find_opp_table(dev);
if (!IS_ERR(opp_table))
return opp_table;
/*
* Allocate a new device OPP table. In the infrequent case where a new
* Allocate a new OPP table. In the infrequent case where a new
* device is needed to be added, we pay this penalty.
*/
dev_opp = kzalloc(sizeof(*dev_opp), GFP_KERNEL);
if (!dev_opp)
opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
if (!opp_table)
return NULL;
INIT_LIST_HEAD(&dev_opp->dev_list);
INIT_LIST_HEAD(&opp_table->dev_list);
list_dev = _add_list_dev(dev, dev_opp);
if (!list_dev) {
kfree(dev_opp);
opp_dev = _add_opp_dev(dev, opp_table);
if (!opp_dev) {
kfree(opp_table);
return NULL;
}
......@@ -792,79 +793,80 @@ static struct device_opp *_add_device_opp(struct device *dev)
u32 val;
if (!of_property_read_u32(np, "clock-latency", &val))
dev_opp->clock_latency_ns_max = val;
opp_table->clock_latency_ns_max = val;
of_property_read_u32(np, "voltage-tolerance",
&dev_opp->voltage_tolerance_v1);
&opp_table->voltage_tolerance_v1);
of_node_put(np);
}
/* Set regulator to a non-NULL error value */
dev_opp->regulator = ERR_PTR(-ENXIO);
opp_table->regulator = ERR_PTR(-ENXIO);
/* Find clk for the device */
dev_opp->clk = clk_get(dev, NULL);
if (IS_ERR(dev_opp->clk)) {
ret = PTR_ERR(dev_opp->clk);
opp_table->clk = clk_get(dev, NULL);
if (IS_ERR(opp_table->clk)) {
ret = PTR_ERR(opp_table->clk);
if (ret != -EPROBE_DEFER)
dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__,
ret);
}
srcu_init_notifier_head(&dev_opp->srcu_head);
INIT_LIST_HEAD(&dev_opp->opp_list);
srcu_init_notifier_head(&opp_table->srcu_head);
INIT_LIST_HEAD(&opp_table->opp_list);
/* Secure the device list modification */
list_add_rcu(&dev_opp->node, &dev_opp_list);
return dev_opp;
/* Secure the device table modification */
list_add_rcu(&opp_table->node, &opp_tables);
return opp_table;
}
/**
* _kfree_device_rcu() - Free device_opp RCU handler
* _kfree_device_rcu() - Free opp_table RCU handler
* @head: RCU head
*/
static void _kfree_device_rcu(struct rcu_head *head)
{
struct device_opp *device_opp = container_of(head, struct device_opp, rcu_head);
struct opp_table *opp_table = container_of(head, struct opp_table,
rcu_head);
kfree_rcu(device_opp, rcu_head);
kfree_rcu(opp_table, rcu_head);
}
/**
* _remove_device_opp() - Removes a device OPP table
* @dev_opp: device OPP table to be removed.
* _remove_opp_table() - Removes a OPP table
* @opp_table: OPP table to be removed.
*
* Removes/frees device OPP table it it doesn't contain any OPPs.
* Removes/frees OPP table if it doesn't contain any OPPs.
*/
static void _remove_device_opp(struct device_opp *dev_opp)
static void _remove_opp_table(struct opp_table *opp_table)
{
struct device_list_opp *list_dev;
struct opp_device *opp_dev;
if (!list_empty(&dev_opp->opp_list))
if (!list_empty(&opp_table->opp_list))
return;
if (dev_opp->supported_hw)
if (opp_table->supported_hw)
return;
if (dev_opp->prop_name)
if (opp_table->prop_name)
return;
if (!IS_ERR(dev_opp->regulator))
if (!IS_ERR(opp_table->regulator))
return;
/* Release clk */
if (!IS_ERR(dev_opp->clk))
clk_put(dev_opp->clk);
if (!IS_ERR(opp_table->clk))
clk_put(opp_table->clk);
list_dev = list_first_entry(&dev_opp->dev_list, struct device_list_opp,
node);
opp_dev = list_first_entry(&opp_table->dev_list, struct opp_device,
node);
_remove_list_dev(list_dev, dev_opp);
_remove_opp_dev(opp_dev, opp_table);
/* dev_list must be empty now */
WARN_ON(!list_empty(&dev_opp->dev_list));
WARN_ON(!list_empty(&opp_table->dev_list));
list_del_rcu(&dev_opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &dev_opp->rcu_head,
list_del_rcu(&opp_table->node);
call_srcu(&opp_table->srcu_head.srcu, &opp_table->rcu_head,
_kfree_device_rcu);
}
......@@ -881,17 +883,17 @@ static void _kfree_opp_rcu(struct rcu_head *head)
/**
* _opp_remove() - Remove an OPP from a table definition
* @dev_opp: points back to the device_opp struct this opp belongs to
* @opp_table: points back to the opp_table struct this opp belongs to
* @opp: pointer to the OPP to remove
* @notify: OPP_EVENT_REMOVE notification should be sent or not
*
* This function removes an opp definition from the opp list.
* This function removes an opp definition from the opp table.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Locking: The internal opp_table and opp structures are RCU protected.
* It is assumed that the caller holds required mutex for an RCU updater
* strategy.
*/
static void _opp_remove(struct device_opp *dev_opp,
static void _opp_remove(struct opp_table *opp_table,
struct dev_pm_opp *opp, bool notify)
{
/*
......@@ -899,22 +901,23 @@ static void _opp_remove(struct device_opp *dev_opp,
* frequency/voltage list.
*/
if (notify)
srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp);
srcu_notifier_call_chain(&opp_table->srcu_head,
OPP_EVENT_REMOVE, opp);
opp_debug_remove_one(opp);
list_del_rcu(&opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
_remove_device_opp(dev_opp);
_remove_opp_table(opp_table);
}
/**
* dev_pm_opp_remove() - Remove an OPP from OPP list
* dev_pm_opp_remove() - Remove an OPP from OPP table
* @dev: device for which we do this operation
* @freq: OPP to remove with matching 'freq'
*
* This function removes an opp from the opp list.
* This function removes an opp from the opp table.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -923,17 +926,17 @@ static void _opp_remove(struct device_opp *dev_opp,
void dev_pm_opp_remove(struct device *dev, unsigned long freq)
{
struct dev_pm_opp *opp;
struct device_opp *dev_opp;
struct opp_table *opp_table;
bool found = false;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp))
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
goto unlock;
list_for_each_entry(opp, &dev_opp->opp_list, node) {
list_for_each_entry(opp, &opp_table->opp_list, node) {
if (opp->rate == freq) {
found = true;
break;
......@@ -946,14 +949,14 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
goto unlock;
}
_opp_remove(dev_opp, opp, true);
_opp_remove(opp_table, opp, true);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
static struct dev_pm_opp *_allocate_opp(struct device *dev,
struct device_opp **dev_opp)
struct opp_table **opp_table)
{
struct dev_pm_opp *opp;
......@@ -964,8 +967,8 @@ static struct dev_pm_opp *_allocate_opp(struct device *dev,
INIT_LIST_HEAD(&opp->node);
*dev_opp = _add_device_opp(dev);
if (!*dev_opp) {
*opp_table = _add_opp_table(dev);
if (!*opp_table) {
kfree(opp);
return NULL;
}
......@@ -974,9 +977,9 @@ static struct dev_pm_opp *_allocate_opp(struct device *dev,
}
static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
struct device_opp *dev_opp)
struct opp_table *opp_table)
{
struct regulator *reg = dev_opp->regulator;
struct regulator *reg = opp_table->regulator;
if (!IS_ERR(reg) &&
!regulator_is_supported_voltage(reg, opp->u_volt_min,
......@@ -990,21 +993,21 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
}
static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
struct device_opp *dev_opp)
struct opp_table *opp_table)
{
struct dev_pm_opp *opp;
struct list_head *head = &dev_opp->opp_list;
struct list_head *head = &opp_table->opp_list;
int ret;
/*
* Insert new OPP in order of increasing frequency and discard if
* already present.
*
* Need to use &dev_opp->opp_list in the condition part of the 'for'
* Need to use &opp_table->opp_list in the condition part of the 'for'
* loop, don't replace it with head otherwise it will become an infinite
* loop.
*/
list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {
list_for_each_entry_rcu(opp, &opp_table->opp_list, node) {
if (new_opp->rate > opp->rate) {
head = &opp->node;
continue;
......@@ -1022,15 +1025,15 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
0 : -EEXIST;
}
new_opp->dev_opp = dev_opp;
new_opp->opp_table = opp_table;
list_add_rcu(&new_opp->node, head);
ret = opp_debug_create_one(new_opp, dev_opp);
ret = opp_debug_create_one(new_opp, opp_table);
if (ret)
dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n",
__func__, ret);
if (!_opp_supported_by_regulators(new_opp, dev_opp)) {
if (!_opp_supported_by_regulators(new_opp, opp_table)) {
new_opp->available = false;
dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
__func__, new_opp->rate);
......@@ -1046,14 +1049,14 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
* @u_volt: Voltage in uVolts for this OPP
* @dynamic: Dynamically added OPPs.
*
* This function adds an opp definition to the opp list and returns status.
* This function adds an opp definition to the opp table and returns status.
* The opp is made available by default and it can be controlled using
* dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
*
* NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
* and freed by dev_pm_opp_of_remove_table.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1069,15 +1072,15 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
bool dynamic)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *new_opp;
unsigned long tol;
int ret;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
new_opp = _allocate_opp(dev, &dev_opp);
new_opp = _allocate_opp(dev, &opp_table);
if (!new_opp) {
ret = -ENOMEM;
goto unlock;
......@@ -1085,36 +1088,36 @@ static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
/* populate the opp table */
new_opp->rate = freq;
tol = u_volt * dev_opp->voltage_tolerance_v1 / 100;
tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
new_opp->u_volt = u_volt;
new_opp->u_volt_min = u_volt - tol;
new_opp->u_volt_max = u_volt + tol;
new_opp->available = true;
new_opp->dynamic = dynamic;
ret = _opp_add(dev, new_opp, dev_opp);
ret = _opp_add(dev, new_opp, opp_table);
if (ret)
goto free_opp;
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ADD, new_opp);
srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
return 0;
free_opp:
_opp_remove(dev_opp, new_opp, false);
_opp_remove(opp_table, new_opp, false);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
/* TODO: Support multiple regulators */
static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
struct device_opp *dev_opp)
struct opp_table *opp_table)
{
u32 microvolt[3] = {0};
u32 val;
......@@ -1123,9 +1126,9 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
char name[NAME_MAX];
/* Search for "opp-microvolt-<name>" */
if (dev_opp->prop_name) {
if (opp_table->prop_name) {
snprintf(name, sizeof(name), "opp-microvolt-%s",
dev_opp->prop_name);
opp_table->prop_name);
prop = of_find_property(opp->np, name, NULL);
}
......@@ -1171,9 +1174,9 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
/* Search for "opp-microamp-<name>" */
prop = NULL;
if (dev_opp->prop_name) {
if (opp_table->prop_name) {
snprintf(name, sizeof(name), "opp-microamp-%s",
dev_opp->prop_name);
opp_table->prop_name);
prop = of_find_property(opp->np, name, NULL);
}
......@@ -1200,7 +1203,7 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
* OPPs, which are available for those versions, based on its 'opp-supported-hw'
* property.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1209,44 +1212,44 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions,
unsigned int count)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
int ret = 0;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
dev_opp = _add_device_opp(dev);
if (!dev_opp) {
opp_table = _add_opp_table(dev);
if (!opp_table) {
ret = -ENOMEM;
goto unlock;
}
/* Make sure there are no concurrent readers while updating dev_opp */
WARN_ON(!list_empty(&dev_opp->opp_list));
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
/* Do we already have a version hierarchy associated with dev_opp? */
if (dev_opp->supported_hw) {
/* Do we already have a version hierarchy associated with opp_table? */
if (opp_table->supported_hw) {
dev_err(dev, "%s: Already have supported hardware list\n",
__func__);
ret = -EBUSY;
goto err;
}
dev_opp->supported_hw = kmemdup(versions, count * sizeof(*versions),
opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
GFP_KERNEL);
if (!dev_opp->supported_hw) {
if (!opp_table->supported_hw) {
ret = -ENOMEM;
goto err;
}
dev_opp->supported_hw_count = count;
mutex_unlock(&dev_opp_list_lock);
opp_table->supported_hw_count = count;
mutex_unlock(&opp_table_lock);
return 0;
err:
_remove_device_opp(dev_opp);
_remove_opp_table(opp_table);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
......@@ -1257,10 +1260,10 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
* @dev: Device for which supported-hw has to be put.
*
* This is required only for the V2 bindings, and is called for a matching
* dev_pm_opp_set_supported_hw(). Until this is called, the device_opp structure
* dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure
* will not be freed.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1268,36 +1271,37 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
*/
void dev_pm_opp_put_supported_hw(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
/* Check for existing list for 'dev' first */
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
dev_err(dev, "Failed to find dev_opp: %ld\n", PTR_ERR(dev_opp));
/* Check for existing table for 'dev' first */
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "Failed to find opp_table: %ld\n",
PTR_ERR(opp_table));
goto unlock;
}
/* Make sure there are no concurrent readers while updating dev_opp */
WARN_ON(!list_empty(&dev_opp->opp_list));
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
if (!dev_opp->supported_hw) {
if (!opp_table->supported_hw) {
dev_err(dev, "%s: Doesn't have supported hardware list\n",
__func__);
goto unlock;
}
kfree(dev_opp->supported_hw);
dev_opp->supported_hw = NULL;
dev_opp->supported_hw_count = 0;
kfree(opp_table->supported_hw);
opp_table->supported_hw = NULL;
opp_table->supported_hw_count = 0;
/* Try freeing device_opp if this was the last blocking resource */
_remove_device_opp(dev_opp);
/* Try freeing opp_table if this was the last blocking resource */
_remove_opp_table(opp_table);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
......@@ -1311,7 +1315,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
* which the extension will apply are opp-microvolt and opp-microamp. OPP core
* should postfix the property name with -<name> while looking for them.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1319,42 +1323,42 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
*/
int dev_pm_opp_set_prop_name(struct device *dev, const char *name)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
int ret = 0;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
dev_opp = _add_device_opp(dev);
if (!dev_opp) {
opp_table = _add_opp_table(dev);
if (!opp_table) {
ret = -ENOMEM;
goto unlock;
}
/* Make sure there are no concurrent readers while updating dev_opp */
WARN_ON(!list_empty(&dev_opp->opp_list));
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
/* Do we already have a prop-name associated with dev_opp? */
if (dev_opp->prop_name) {
/* Do we already have a prop-name associated with opp_table? */
if (opp_table->prop_name) {
dev_err(dev, "%s: Already have prop-name %s\n", __func__,
dev_opp->prop_name);
opp_table->prop_name);
ret = -EBUSY;
goto err;
}
dev_opp->prop_name = kstrdup(name, GFP_KERNEL);
if (!dev_opp->prop_name) {
opp_table->prop_name = kstrdup(name, GFP_KERNEL);
if (!opp_table->prop_name) {
ret = -ENOMEM;
goto err;
}
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return 0;
err:
_remove_device_opp(dev_opp);
_remove_opp_table(opp_table);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
......@@ -1365,10 +1369,10 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
* @dev: Device for which the prop-name has to be put.
*
* This is required only for the V2 bindings, and is called for a matching
* dev_pm_opp_set_prop_name(). Until this is called, the device_opp structure
* dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure
* will not be freed.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1376,34 +1380,35 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
*/
void dev_pm_opp_put_prop_name(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
/* Check for existing list for 'dev' first */
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
dev_err(dev, "Failed to find dev_opp: %ld\n", PTR_ERR(dev_opp));
/* Check for existing table for 'dev' first */
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "Failed to find opp_table: %ld\n",
PTR_ERR(opp_table));
goto unlock;
}
/* Make sure there are no concurrent readers while updating dev_opp */
WARN_ON(!list_empty(&dev_opp->opp_list));
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
if (!dev_opp->prop_name) {
if (!opp_table->prop_name) {
dev_err(dev, "%s: Doesn't have a prop-name\n", __func__);
goto unlock;
}
kfree(dev_opp->prop_name);
dev_opp->prop_name = NULL;
kfree(opp_table->prop_name);
opp_table->prop_name = NULL;
/* Try freeing device_opp if this was the last blocking resource */
_remove_device_opp(dev_opp);
/* Try freeing opp_table if this was the last blocking resource */
_remove_opp_table(opp_table);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
......@@ -1417,7 +1422,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
*
* This must be called before any OPPs are initialized for the device.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1425,26 +1430,26 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
*/
int dev_pm_opp_set_regulator(struct device *dev, const char *name)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct regulator *reg;
int ret;
mutex_lock(&dev_opp_list_lock);
mutex_lock(&opp_table_lock);
dev_opp = _add_device_opp(dev);
if (!dev_opp) {
opp_table = _add_opp_table(dev);
if (!opp_table) {
ret = -ENOMEM;
goto unlock;
}
/* This should be called before OPPs are initialized */
if (WARN_ON(!list_empty(&dev_opp->opp_list))) {
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
ret = -EBUSY;
goto err;
}
/* Already have a regulator set */
if (WARN_ON(!IS_ERR(dev_opp->regulator))) {
if (WARN_ON(!IS_ERR(opp_table->regulator))) {
ret = -EBUSY;
goto err;
}
......@@ -1458,15 +1463,15 @@ int dev_pm_opp_set_regulator(struct device *dev, const char *name)
goto err;
}
dev_opp->regulator = reg;
opp_table->regulator = reg;
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return 0;
err:
_remove_device_opp(dev_opp);
_remove_opp_table(opp_table);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
......@@ -1476,7 +1481,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulator);
* dev_pm_opp_put_regulator() - Releases resources blocked for regulator
* @dev: Device for which regulator was set.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1484,44 +1489,45 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulator);
*/
void dev_pm_opp_put_regulator(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
mutex_lock(&dev_opp_list_lock);
mutex_lock(&opp_table_lock);
/* Check for existing list for 'dev' first */
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
dev_err(dev, "Failed to find dev_opp: %ld\n", PTR_ERR(dev_opp));
/* Check for existing table for 'dev' first */
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "Failed to find opp_table: %ld\n",
PTR_ERR(opp_table));
goto unlock;
}
if (IS_ERR(dev_opp->regulator)) {
if (IS_ERR(opp_table->regulator)) {
dev_err(dev, "%s: Doesn't have regulator set\n", __func__);
goto unlock;
}
/* Make sure there are no concurrent readers while updating dev_opp */
WARN_ON(!list_empty(&dev_opp->opp_list));
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
regulator_put(dev_opp->regulator);
dev_opp->regulator = ERR_PTR(-ENXIO);
regulator_put(opp_table->regulator);
opp_table->regulator = ERR_PTR(-ENXIO);
/* Try freeing device_opp if this was the last blocking resource */
_remove_device_opp(dev_opp);
/* Try freeing opp_table if this was the last blocking resource */
_remove_opp_table(opp_table);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator);
static bool _opp_is_supported(struct device *dev, struct device_opp *dev_opp,
static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
struct device_node *np)
{
unsigned int count = dev_opp->supported_hw_count;
unsigned int count = opp_table->supported_hw_count;
u32 version;
int ret;
if (!dev_opp->supported_hw)
if (!opp_table->supported_hw)
return true;
while (count--) {
......@@ -1534,7 +1540,7 @@ static bool _opp_is_supported(struct device *dev, struct device_opp *dev_opp,
}
/* Both of these are bitwise masks of the versions */
if (!(version & dev_opp->supported_hw[count]))
if (!(version & opp_table->supported_hw[count]))
return false;
}
......@@ -1546,11 +1552,11 @@ static bool _opp_is_supported(struct device *dev, struct device_opp *dev_opp,
* @dev: device for which we do this operation
* @np: device node
*
* This function adds an opp definition to the opp list and returns status. The
* This function adds an opp definition to the opp table and returns status. The
* opp can be controlled using dev_pm_opp_enable/disable functions and may be
* removed by dev_pm_opp_remove.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1566,16 +1572,16 @@ static bool _opp_is_supported(struct device *dev, struct device_opp *dev_opp,
*/
static int _opp_add_static_v2(struct device *dev, struct device_node *np)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *new_opp;
u64 rate;
u32 val;
int ret;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
new_opp = _allocate_opp(dev, &dev_opp);
new_opp = _allocate_opp(dev, &opp_table);
if (!new_opp) {
ret = -ENOMEM;
goto unlock;
......@@ -1588,7 +1594,7 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
}
/* Check if the OPP supports hardware's hierarchy of versions or not */
if (!_opp_is_supported(dev, dev_opp, np)) {
if (!_opp_is_supported(dev, opp_table, np)) {
dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
goto free_opp;
}
......@@ -1608,30 +1614,30 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
if (!of_property_read_u32(np, "clock-latency-ns", &val))
new_opp->clock_latency_ns = val;
ret = opp_parse_supplies(new_opp, dev, dev_opp);
ret = opp_parse_supplies(new_opp, dev, opp_table);
if (ret)
goto free_opp;
ret = _opp_add(dev, new_opp, dev_opp);
ret = _opp_add(dev, new_opp, opp_table);
if (ret)
goto free_opp;
/* OPP to select on device suspend */
if (of_property_read_bool(np, "opp-suspend")) {
if (dev_opp->suspend_opp) {
if (opp_table->suspend_opp) {
dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
__func__, dev_opp->suspend_opp->rate,
__func__, opp_table->suspend_opp->rate,
new_opp->rate);
} else {
new_opp->suspend = true;
dev_opp->suspend_opp = new_opp;
opp_table->suspend_opp = new_opp;
}
}
if (new_opp->clock_latency_ns > dev_opp->clock_latency_ns_max)
dev_opp->clock_latency_ns_max = new_opp->clock_latency_ns;
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(&dev_opp_list_lock);
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->u_volt,
......@@ -1642,13 +1648,13 @@ 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(&dev_opp->srcu_head, OPP_EVENT_ADD, new_opp);
srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
return 0;
free_opp:
_opp_remove(dev_opp, new_opp, false);
_opp_remove(opp_table, new_opp, false);
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
......@@ -1658,11 +1664,11 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
* @freq: Frequency in Hz for this OPP
* @u_volt: Voltage in uVolts for this OPP
*
* This function adds an opp definition to the opp list and returns status.
* This function adds an opp definition to the opp table and returns status.
* The opp is made available by default and it can be controlled using
* dev_pm_opp_enable/disable functions.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1694,7 +1700,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_add);
* copy operation, returns 0 if no modification was done OR modification was
* successful.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1703,7 +1709,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_add);
static int _opp_set_availability(struct device *dev, unsigned long freq,
bool availability_req)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV);
int r = 0;
......@@ -1712,18 +1718,18 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
if (!new_opp)
return -ENOMEM;
mutex_lock(&dev_opp_list_lock);
mutex_lock(&opp_table_lock);
/* Find the device_opp */
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
r = PTR_ERR(dev_opp);
/* Find the opp_table */
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
r = PTR_ERR(opp_table);
dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
goto unlock;
}
/* Do we have the frequency? */
list_for_each_entry(tmp_opp, &dev_opp->opp_list, node) {
list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
if (tmp_opp->rate == freq) {
opp = tmp_opp;
break;
......@@ -1744,21 +1750,21 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
new_opp->available = availability_req;
list_replace_rcu(&opp->node, &new_opp->node);
mutex_unlock(&dev_opp_list_lock);
call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
mutex_unlock(&opp_table_lock);
call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
/* Notify the change of the OPP availability */
if (availability_req)
srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ENABLE,
new_opp);
srcu_notifier_call_chain(&opp_table->srcu_head,
OPP_EVENT_ENABLE, new_opp);
else
srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_DISABLE,
new_opp);
srcu_notifier_call_chain(&opp_table->srcu_head,
OPP_EVENT_DISABLE, new_opp);
return 0;
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
kfree(new_opp);
return r;
}
......@@ -1772,7 +1778,7 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
* corresponding error value. It is meant to be used for users an OPP available
* after being temporarily made unavailable with dev_pm_opp_disable.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function indirectly uses RCU and 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
......@@ -1798,7 +1804,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
* control by users to make this OPP not available until the circumstances are
* right to make it available again (with a call to dev_pm_opp_enable).
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function indirectly uses RCU and 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
......@@ -1816,26 +1822,26 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
/**
* dev_pm_opp_get_notifier() - find notifier_head of the device with opp
* @dev: device pointer used to lookup device OPPs.
* @dev: device pointer used to lookup OPP table.
*
* Return: pointer to notifier head if found, otherwise -ENODEV or
* -EINVAL based on type of error casted as pointer. value must be checked
* with IS_ERR to determine valid pointer or error result.
*
* Locking: This function must be called under rcu_read_lock(). dev_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
* Locking: This function must be called under rcu_read_lock(). opp_table 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.
*/
struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev)
{
struct device_opp *dev_opp = _find_device_opp(dev);
struct opp_table *opp_table = _find_opp_table(dev);
if (IS_ERR(dev_opp))
return ERR_CAST(dev_opp); /* matching type */
if (IS_ERR(opp_table))
return ERR_CAST(opp_table); /* matching type */
return &dev_opp->srcu_head;
return &opp_table->srcu_head;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
......@@ -1843,11 +1849,11 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
/**
* dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
* entries
* @dev: device pointer used to lookup device OPPs.
* @dev: device pointer used to lookup OPP table.
*
* Free OPPs created using static entries present in DT.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......@@ -1855,38 +1861,38 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
*/
void dev_pm_opp_of_remove_table(struct device *dev)
{
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct dev_pm_opp *opp, *tmp;
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
/* Check for existing list for 'dev' */
dev_opp = _find_device_opp(dev);
if (IS_ERR(dev_opp)) {
int error = PTR_ERR(dev_opp);
/* Check for existing table for 'dev' */
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
int error = PTR_ERR(opp_table);
if (error != -ENODEV)
WARN(1, "%s: dev_opp: %d\n",
WARN(1, "%s: opp_table: %d\n",
IS_ERR_OR_NULL(dev) ?
"Invalid device" : dev_name(dev),
error);
goto unlock;
}
/* Find if dev_opp manages a single device */
if (list_is_singular(&dev_opp->dev_list)) {
/* Find if opp_table manages a single device */
if (list_is_singular(&opp_table->dev_list)) {
/* Free static OPPs */
list_for_each_entry_safe(opp, tmp, &dev_opp->opp_list, node) {
list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
if (!opp->dynamic)
_opp_remove(dev_opp, opp, true);
_opp_remove(opp_table, opp, true);
}
} else {
_remove_list_dev(_find_list_dev(dev, dev_opp), dev_opp);
_remove_opp_dev(_find_opp_dev(dev, opp_table), opp_table);
}
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
......@@ -1907,22 +1913,22 @@ struct device_node *_of_get_opp_desc_node(struct device *dev)
static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
{
struct device_node *np;
struct device_opp *dev_opp;
struct opp_table *opp_table;
int ret = 0, count = 0;
mutex_lock(&dev_opp_list_lock);
mutex_lock(&opp_table_lock);
dev_opp = _managed_opp(opp_np);
if (dev_opp) {
opp_table = _managed_opp(opp_np);
if (opp_table) {
/* OPPs are already managed */
if (!_add_list_dev(dev, dev_opp))
if (!_add_opp_dev(dev, opp_table))
ret = -ENOMEM;
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
/* We have opp-list node now, iterate over it and add OPPs */
/* We have opp-table node now, iterate over it and add OPPs */
for_each_available_child_of_node(opp_np, np) {
count++;
......@@ -1938,19 +1944,19 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
if (WARN_ON(!count))
return -ENOENT;
mutex_lock(&dev_opp_list_lock);
mutex_lock(&opp_table_lock);
dev_opp = _find_device_opp(dev);
if (WARN_ON(IS_ERR(dev_opp))) {
ret = PTR_ERR(dev_opp);
mutex_unlock(&dev_opp_list_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;
}
dev_opp->np = opp_np;
dev_opp->shared_opp = of_property_read_bool(opp_np, "opp-shared");
opp_table->np = opp_np;
opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared");
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return 0;
......@@ -1979,7 +1985,7 @@ static int _of_add_opp_table_v1(struct device *dev)
*/
nr = prop->length / sizeof(u32);
if (nr % 2) {
dev_err(dev, "%s: Invalid OPP list\n", __func__);
dev_err(dev, "%s: Invalid OPP table\n", __func__);
return -EINVAL;
}
......@@ -1999,11 +2005,11 @@ static int _of_add_opp_table_v1(struct device *dev)
/**
* dev_pm_opp_of_add_table() - Initialize opp table from device tree
* @dev: device pointer used to lookup device OPPs.
* @dev: device pointer used to lookup OPP table.
*
* Register the initial OPP table with the OPP library for given device.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* 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
......
drivers/base/power/opp/cpu.c
View file @ 2c2709dc
......@@ -31,7 +31,7 @@
* @table: Cpufreq table returned back to caller
*
* Generate a cpufreq table for a provided device- this assumes that the
* opp list is already initialized and ready for usage.
* opp table is already initialized and ready for usage.
*
* This function allocates required memory for the cpufreq table. It is
* expected that the caller does the required maintenance such as freeing
......@@ -44,7 +44,7 @@
* 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 device_opp and opp structures are RCU protected.
* 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.
......@@ -122,15 +122,15 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
/* Required only for V1 bindings, as v2 can manage it from DT itself */
int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
{
struct device_list_opp *list_dev;
struct device_opp *dev_opp;
struct opp_device *opp_dev;
struct opp_table *opp_table;
struct device *dev;
int cpu, ret = 0;
mutex_lock(&dev_opp_list_lock);
mutex_lock(&opp_table_lock);
dev_opp = _find_device_opp(cpu_dev);
if (IS_ERR(dev_opp)) {
opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
ret = -EINVAL;
goto unlock;
}
......@@ -146,15 +146,15 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
continue;
}
list_dev = _add_list_dev(dev, dev_opp);
if (!list_dev) {
dev_err(dev, "%s: failed to add list-dev for cpu%d device\n",
opp_dev = _add_opp_dev(dev, opp_table);
if (!opp_dev) {
dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",
__func__, cpu);
continue;
}
}
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
......
drivers/base/power/opp/debugfs.c
View file @ 2c2709dc
......@@ -34,9 +34,9 @@ void opp_debug_remove_one(struct dev_pm_opp *opp)
debugfs_remove_recursive(opp->dentry);
}
int opp_debug_create_one(struct dev_pm_opp *opp, struct device_opp *dev_opp)
int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
{
struct dentry *pdentry = dev_opp->dentry;
struct dentry *pdentry = opp_table->dentry;
struct dentry *d;
char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
......@@ -83,52 +83,52 @@ int opp_debug_create_one(struct dev_pm_opp *opp, struct device_opp *dev_opp)
return 0;
}
static int device_opp_debug_create_dir(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
static int opp_list_debug_create_dir(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
const struct device *dev = list_dev->dev;
const struct device *dev = opp_dev->dev;
struct dentry *d;
opp_set_dev_name(dev, dev_opp->dentry_name);
opp_set_dev_name(dev, opp_table->dentry_name);
/* Create device specific directory */
d = debugfs_create_dir(dev_opp->dentry_name, rootdir);
d = debugfs_create_dir(opp_table->dentry_name, rootdir);
if (!d) {
dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
return -ENOMEM;
}
list_dev->dentry = d;
dev_opp->dentry = d;
opp_dev->dentry = d;
opp_table->dentry = d;
return 0;
}
static int device_opp_debug_create_link(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
static int opp_list_debug_create_link(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
const struct device *dev = list_dev->dev;
const struct device *dev = opp_dev->dev;
char name[NAME_MAX];
struct dentry *d;
opp_set_dev_name(list_dev->dev, name);
opp_set_dev_name(opp_dev->dev, name);
/* Create device specific directory link */
d = debugfs_create_symlink(name, rootdir, dev_opp->dentry_name);
d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);
if (!d) {
dev_err(dev, "%s: Failed to create link\n", __func__);
return -ENOMEM;
}
list_dev->dentry = d;
opp_dev->dentry = d;
return 0;
}
/**
* opp_debug_register - add a device opp node to the debugfs 'opp' directory
* @list_dev: list-dev pointer for device
* @dev_opp: the device-opp being added
* @opp_dev: opp-dev pointer for device
* @opp_table: the device-opp being added
*
* Dynamically adds device specific directory in debugfs 'opp' directory. If the
* device-opp is shared with other devices, then links will be created for all
......@@ -136,73 +136,72 @@ static int device_opp_debug_create_link(struct device_list_opp *list_dev,
*
* Return: 0 on success, otherwise negative error.
*/
int opp_debug_register(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
{
if (!rootdir) {
pr_debug("%s: Uninitialized rootdir\n", __func__);
return -EINVAL;
}
if (dev_opp->dentry)
return device_opp_debug_create_link(list_dev, dev_opp);
if (opp_table->dentry)
return opp_list_debug_create_link(opp_dev, opp_table);
return device_opp_debug_create_dir(list_dev, dev_opp);
return opp_list_debug_create_dir(opp_dev, opp_table);
}
static void opp_migrate_dentry(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
static void opp_migrate_dentry(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
struct device_list_opp *new_dev;
struct opp_device *new_dev;
const struct device *dev;
struct dentry *dentry;
/* Look for next list-dev */
list_for_each_entry(new_dev, &dev_opp->dev_list, node)
if (new_dev != list_dev)
/* Look for next opp-dev */
list_for_each_entry(new_dev, &opp_table->dev_list, node)
if (new_dev != opp_dev)
break;
/* new_dev is guaranteed to be valid here */
dev = new_dev->dev;
debugfs_remove_recursive(new_dev->dentry);
opp_set_dev_name(dev, dev_opp->dentry_name);
opp_set_dev_name(dev, opp_table->dentry_name);
dentry = debugfs_rename(rootdir, list_dev->dentry, rootdir,
dev_opp->dentry_name);
dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
opp_table->dentry_name);
if (!dentry) {
dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
__func__, dev_name(list_dev->dev), dev_name(dev));
__func__, dev_name(opp_dev->dev), dev_name(dev));
return;
}
new_dev->dentry = dentry;
dev_opp->dentry = dentry;
opp_table->dentry = dentry;
}
/**
* opp_debug_unregister - remove a device opp node from debugfs opp directory
* @list_dev: list-dev pointer for device
* @dev_opp: the device-opp being removed
* @opp_dev: opp-dev pointer for device
* @opp_table: the device-opp being removed
*
* Dynamically removes device specific directory from debugfs 'opp' directory.
*/
void opp_debug_unregister(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
void opp_debug_unregister(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
if (list_dev->dentry == dev_opp->dentry) {
if (opp_dev->dentry == opp_table->dentry) {
/* Move the real dentry object under another device */
if (!list_is_singular(&dev_opp->dev_list)) {
opp_migrate_dentry(list_dev, dev_opp);
if (!list_is_singular(&opp_table->dev_list)) {
opp_migrate_dentry(opp_dev, opp_table);
goto out;
}
dev_opp->dentry = NULL;
opp_table->dentry = NULL;
}
debugfs_remove_recursive(list_dev->dentry);
debugfs_remove_recursive(opp_dev->dentry);
out:
list_dev->dentry = NULL;
opp_dev->dentry = NULL;
}
static int __init opp_debug_init(void)
......
drivers/base/power/opp/opp.h
View file @ 2c2709dc
......@@ -26,12 +26,12 @@ struct clk;
struct regulator;
/* Lock to allow exclusive modification to the device and opp lists */
extern struct mutex dev_opp_list_lock;
extern struct mutex opp_table_lock;
/*
* Internal data structure organization with the OPP layer library is as
* follows:
* dev_opp_list (root)
* opp_tables (root)
* |- device 1 (represents voltage domain 1)
* | |- opp 1 (availability, freq, voltage)
* | |- opp 2 ..
......@@ -40,18 +40,18 @@ extern struct mutex dev_opp_list_lock;
* |- device 2 (represents the next voltage domain)
* ...
* `- device m (represents mth voltage domain)
* device 1, 2.. are represented by dev_opp structure while each opp
* device 1, 2.. are represented by opp_table structure while each opp
* is represented by the opp structure.
*/
/**
* struct dev_pm_opp - Generic OPP description structure
* @node: opp list node. The nodes are maintained throughout the lifetime
* @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 list is traversed with RCU locks. node
* RCU usage: opp table is traversed with RCU locks. node
* modification is possible realtime, hence the modifications
* are protected by the dev_opp_list_lock for integrity.
* are protected by the opp_table_lock for integrity.
* IMPORTANT: the opp nodes should be maintained in increasing
* order.
* @available: true/false - marks if this OPP as available or not
......@@ -65,7 +65,7 @@ extern struct mutex dev_opp_list_lock;
* @u_amp: Maximum current drawn by the device in microamperes
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
* frequency from any other OPP's frequency.
* @dev_opp: points back to the device_opp struct this opp belongs to
* @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)
......@@ -87,7 +87,7 @@ struct dev_pm_opp {
unsigned long u_amp;
unsigned long clock_latency_ns;
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct rcu_head rcu_head;
struct device_node *np;
......@@ -98,16 +98,16 @@ struct dev_pm_opp {
};
/**
* struct device_list_opp - devices managed by 'struct device_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 list of devices that are
* managed by 'struct device_opp'.
* This is an internal data structure maintaining the devices that are managed
* by 'struct opp_table'.
*/
struct device_list_opp {
struct opp_device {
struct list_head node;
const struct device *dev;
struct rcu_head rcu_head;
......@@ -118,16 +118,16 @@ struct device_list_opp {
};
/**
* struct device_opp - Device opp structure
* @node: list node - contains the devices with OPPs that
* struct opp_table - Device opp structure
* @node: table node - contains the devices with OPPs that
* have been registered. Nodes once added are not modified in this
* list.
* RCU usage: nodes are not modified in the list of device_opp,
* however addition is possible and is secured by dev_opp_list_lock
* 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
* @dev_list: list of devices that share these OPPs
* @opp_list: list of opps
* @opp_list: table of opps
* @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.
......@@ -150,7 +150,7 @@ struct device_list_opp {
* 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 device_opp {
struct opp_table {
struct list_head node;
struct srcu_notifier_head srcu_head;
......@@ -180,30 +180,27 @@ struct device_opp {
};
/* Routines internal to opp core */
struct device_opp *_find_device_opp(struct device *dev);
struct device_list_opp *_add_list_dev(const struct device *dev,
struct device_opp *dev_opp);
struct opp_table *_find_opp_table(struct device *dev);
struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
struct device_node *_of_get_opp_desc_node(struct device *dev);
#ifdef CONFIG_DEBUG_FS
void opp_debug_remove_one(struct dev_pm_opp *opp);
int opp_debug_create_one(struct dev_pm_opp *opp, struct device_opp *dev_opp);
int opp_debug_register(struct device_list_opp *list_dev,
struct device_opp *dev_opp);
void opp_debug_unregister(struct device_list_opp *list_dev,
struct device_opp *dev_opp);
int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
#else
static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
static inline int opp_debug_create_one(struct dev_pm_opp *opp,
struct device_opp *dev_opp)
struct opp_table *opp_table)
{ return 0; }
static inline int opp_debug_register(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
static inline int opp_debug_register(struct opp_device *opp_dev,
struct opp_table *opp_table)
{ return 0; }
static inline void opp_debug_unregister(struct device_list_opp *list_dev,
struct device_opp *dev_opp)
static inline void opp_debug_unregister(struct opp_device *opp_dev,
struct opp_table *opp_table)
{ }
#endif /* DEBUG_FS */
......
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