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Merge branch 'pm-opp'

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* pm-opp:
  PM / OPP: Rename structures for clarity
  PM / OPP: Fix incorrect comments
  PM / OPP: Initialize regulator pointer to an error value
  PM / OPP: Initialize u_volt_min/max to a valid value
  PM / OPP: Fix NULL pointer dereference crash when disabling OPPs
  PM / OPP: Add dev_pm_opp_set_rate()
  PM / OPP: Manage device clk
  PM / OPP: Parse clock-latency and voltage-tolerance for v1 bindings
  PM / OPP: Introduce dev_pm_opp_get_max_transition_latency()
  PM / OPP: Introduce dev_pm_opp_get_max_volt_latency()
  PM / OPP: Disable OPPs that aren't supported by the regulator
  PM / OPP: get/put regulators from OPP core
This commit is contained in:
Rafael J. Wysocki 2016-03-14 14:21:55 +01:00
commit b5d5fad9be
5 changed files with 882 additions and 411 deletions
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1085
drivers/base/power/opp/core.c
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File diff suppressed because it is too large Load Diff

22
drivers/base/power/opp/cpu.c
View File

@ -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;
}

85
drivers/base/power/opp/debugfs.c
View File

@ -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)

74
drivers/base/power/opp/opp.h
View File

@ -22,13 +22,16 @@
#include <linux/rculist.h>
#include <linux/rcupdate.h>
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 ..
@ -37,18 +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
@ -62,7 +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)
@ -84,7 +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;
@ -95,16 +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;
@ -115,16 +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.
@ -132,9 +135,13 @@ struct device_list_opp {
* @supported_hw: Array of version number to support.
* @supported_hw_count: Number of elements in supported_hw array.
* @prop_name: A name to postfix to many DT properties, while parsing them.
* @clk: Device's clock handle
* @regulator: Supply regulator
* @dentry: debugfs dentry pointer of the real device directory (not links).
* @dentry_name: Name of the real dentry.
*
* @voltage_tolerance_v1: In percentage, for v1 bindings only.
*
* 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.
@ -143,7 +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;
@ -153,12 +160,18 @@ struct device_opp {
struct device_node *np;
unsigned long clock_latency_ns_max;
/* For backward compatibility with v1 bindings */
unsigned int voltage_tolerance_v1;
bool shared_opp;
struct dev_pm_opp *suspend_opp;
unsigned int *supported_hw;
unsigned int supported_hw_count;
const char *prop_name;
struct clk *clk;
struct regulator *regulator;
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
@ -167,30 +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 */

27
include/linux/pm_opp.h
View File

@ -34,6 +34,8 @@ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
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);
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
@ -60,6 +62,9 @@ int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions,
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_set_regulator(struct device *dev, const char *name);
void dev_pm_opp_put_regulator(struct device *dev);
int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
#else
static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
{
@ -86,6 +91,16 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
return 0;
}
static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
{
return 0;
}
static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
{
return 0;
}
static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
{
return NULL;
@ -151,6 +166,18 @@ static inline int dev_pm_opp_set_prop_name(struct device *dev, const char *name)
static inline void dev_pm_opp_put_prop_name(struct device *dev) {}
static inline int dev_pm_opp_set_regulator(struct device *dev, const char *name)
{
return -EINVAL;
}
static inline void dev_pm_opp_put_regulator(struct device *dev) {}
static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
{
return -EINVAL;
}
#endif /* CONFIG_PM_OPP */
#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)