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-rw-r--r--include/linux/devfreq.h136
1 files changed, 71 insertions, 65 deletions
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 281c72a3b9d..e83ef39b3be 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -25,12 +25,12 @@ struct devfreq;
* struct devfreq_dev_status - Data given from devfreq user device to
* governors. Represents the performance
* statistics.
- * @total_time The total time represented by this instance of
+ * @total_time: The total time represented by this instance of
* devfreq_dev_status
- * @busy_time The time that the device was working among the
+ * @busy_time: The time that the device was working among the
* total_time.
- * @current_frequency The operating frequency.
- * @private_data An entry not specified by the devfreq framework.
+ * @current_frequency: The operating frequency.
+ * @private_data: An entry not specified by the devfreq framework.
* A device and a specific governor may have their
* own protocol with private_data. However, because
* this is governor-specific, a governor using this
@@ -54,23 +54,27 @@ struct devfreq_dev_status {
/**
* struct devfreq_dev_profile - Devfreq's user device profile
- * @initial_freq The operating frequency when devfreq_add_device() is
+ * @initial_freq: The operating frequency when devfreq_add_device() is
* called.
- * @polling_ms The polling interval in ms. 0 disables polling.
- * @target The device should set its operating frequency at
+ * @polling_ms: The polling interval in ms. 0 disables polling.
+ * @target: The device should set its operating frequency at
* freq or lowest-upper-than-freq value. If freq is
* higher than any operable frequency, set maximum.
* Before returning, target function should set
* freq at the current frequency.
* The "flags" parameter's possible values are
* explained above with "DEVFREQ_FLAG_*" macros.
- * @get_dev_status The device should provide the current performance
+ * @get_dev_status: The device should provide the current performance
* status to devfreq, which is used by governors.
- * @exit An optional callback that is called when devfreq
+ * @get_cur_freq: The device should provide the current frequency
+ * at which it is operating.
+ * @exit: An optional callback that is called when devfreq
* is removing the devfreq object due to error or
* from devfreq_remove_device() call. If the user
* has registered devfreq->nb at a notifier-head,
* this is the time to unregister it.
+ * @freq_table: Optional list of frequencies to support statistics.
+ * @max_state: The size of freq_table.
*/
struct devfreq_dev_profile {
unsigned long initial_freq;
@@ -79,63 +83,63 @@ struct devfreq_dev_profile {
int (*target)(struct device *dev, unsigned long *freq, u32 flags);
int (*get_dev_status)(struct device *dev,
struct devfreq_dev_status *stat);
+ int (*get_cur_freq)(struct device *dev, unsigned long *freq);
void (*exit)(struct device *dev);
+
+ unsigned int *freq_table;
+ unsigned int max_state;
};
/**
* struct devfreq_governor - Devfreq policy governor
- * @name Governor's name
- * @get_target_freq Returns desired operating frequency for the device.
+ * @node: list node - contains registered devfreq governors
+ * @name: Governor's name
+ * @get_target_freq: Returns desired operating frequency for the device.
* Basically, get_target_freq will run
* devfreq_dev_profile.get_dev_status() to get the
* status of the device (load = busy_time / total_time).
* If no_central_polling is set, this callback is called
* only with update_devfreq() notified by OPP.
- * @init Called when the devfreq is being attached to a device
- * @exit Called when the devfreq is being removed from a
- * device. Governor should stop any internal routines
- * before return because related data may be
- * freed after exit().
- * @no_central_polling Do not use devfreq's central polling mechanism.
- * When this is set, devfreq will not call
- * get_target_freq with devfreq_monitor(). However,
- * devfreq will call get_target_freq with
- * devfreq_update() notified by OPP framework.
+ * @event_handler: Callback for devfreq core framework to notify events
+ * to governors. Events include per device governor
+ * init and exit, opp changes out of devfreq, suspend
+ * and resume of per device devfreq during device idle.
*
* Note that the callbacks are called with devfreq->lock locked by devfreq.
*/
struct devfreq_governor {
+ struct list_head node;
+
const char name[DEVFREQ_NAME_LEN];
int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
- int (*init)(struct devfreq *this);
- void (*exit)(struct devfreq *this);
- const bool no_central_polling;
+ int (*event_handler)(struct devfreq *devfreq,
+ unsigned int event, void *data);
};
/**
* struct devfreq - Device devfreq structure
- * @node list node - contains the devices with devfreq that have been
+ * @node: list node - contains the devices with devfreq that have been
* registered.
- * @lock a mutex to protect accessing devfreq.
- * @dev device registered by devfreq class. dev.parent is the device
+ * @lock: a mutex to protect accessing devfreq.
+ * @dev: device registered by devfreq class. dev.parent is the device
* using devfreq.
- * @profile device-specific devfreq profile
- * @governor method how to choose frequency based on the usage.
- * @nb notifier block used to notify devfreq object that it should
+ * @profile: device-specific devfreq profile
+ * @governor: method how to choose frequency based on the usage.
+ * @governor_name: devfreq governor name for use with this devfreq
+ * @nb: notifier block used to notify devfreq object that it should
* reevaluate operable frequencies. Devfreq users may use
* devfreq.nb to the corresponding register notifier call chain.
- * @polling_jiffies interval in jiffies.
- * @previous_freq previously configured frequency value.
- * @next_polling the number of remaining jiffies to poll with
- * "devfreq_monitor" executions to reevaluate
- * frequency/voltage of the device. Set by
- * profile's polling_ms interval.
- * @data Private data of the governor. The devfreq framework does not
+ * @work: delayed work for load monitoring.
+ * @previous_freq: previously configured frequency value.
+ * @data: Private data of the governor. The devfreq framework does not
* touch this.
- * @being_removed a flag to mark that this object is being removed in
- * order to prevent trying to remove the object multiple times.
- * @min_freq Limit minimum frequency requested by user (0: none)
- * @max_freq Limit maximum frequency requested by user (0: none)
+ * @min_freq: Limit minimum frequency requested by user (0: none)
+ * @max_freq: Limit maximum frequency requested by user (0: none)
+ * @stop_polling: devfreq polling status of a device.
+ * @total_trans: Number of devfreq transitions
+ * @trans_table: Statistics of devfreq transitions
+ * @time_in_state: Statistics of devfreq states
+ * @last_stat_updated: The last time stat updated
*
* This structure stores the devfreq information for a give device.
*
@@ -152,26 +156,33 @@ struct devfreq {
struct device dev;
struct devfreq_dev_profile *profile;
const struct devfreq_governor *governor;
+ char governor_name[DEVFREQ_NAME_LEN];
struct notifier_block nb;
+ struct delayed_work work;
- unsigned long polling_jiffies;
unsigned long previous_freq;
- unsigned int next_polling;
void *data; /* private data for governors */
- bool being_removed;
-
unsigned long min_freq;
unsigned long max_freq;
+ bool stop_polling;
+
+ /* information for device freqeuncy transition */
+ unsigned int total_trans;
+ unsigned int *trans_table;
+ unsigned long *time_in_state;
+ unsigned long last_stat_updated;
};
#if defined(CONFIG_PM_DEVFREQ)
extern struct devfreq *devfreq_add_device(struct device *dev,
struct devfreq_dev_profile *profile,
- const struct devfreq_governor *governor,
+ const char *governor_name,
void *data);
extern int devfreq_remove_device(struct devfreq *devfreq);
+extern int devfreq_suspend_device(struct devfreq *devfreq);
+extern int devfreq_resume_device(struct devfreq *devfreq);
/* Helper functions for devfreq user device driver with OPP. */
extern struct opp *devfreq_recommended_opp(struct device *dev,
@@ -181,23 +192,13 @@ extern int devfreq_register_opp_notifier(struct device *dev,
extern int devfreq_unregister_opp_notifier(struct device *dev,
struct devfreq *devfreq);
-#ifdef CONFIG_DEVFREQ_GOV_POWERSAVE
-extern const struct devfreq_governor devfreq_powersave;
-#endif
-#ifdef CONFIG_DEVFREQ_GOV_PERFORMANCE
-extern const struct devfreq_governor devfreq_performance;
-#endif
-#ifdef CONFIG_DEVFREQ_GOV_USERSPACE
-extern const struct devfreq_governor devfreq_userspace;
-#endif
-#ifdef CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND
-extern const struct devfreq_governor devfreq_simple_ondemand;
+#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
/**
* struct devfreq_simple_ondemand_data - void *data fed to struct devfreq
* and devfreq_add_device
- * @ upthreshold If the load is over this value, the frequency jumps.
+ * @upthreshold: If the load is over this value, the frequency jumps.
* Specify 0 to use the default. Valid value = 0 to 100.
- * @ downdifferential If the load is under upthreshold - downdifferential,
+ * @downdifferential: If the load is under upthreshold - downdifferential,
* the governor may consider slowing the frequency down.
* Specify 0 to use the default. Valid value = 0 to 100.
* downdifferential < upthreshold must hold.
@@ -214,7 +215,7 @@ struct devfreq_simple_ondemand_data {
#else /* !CONFIG_PM_DEVFREQ */
static struct devfreq *devfreq_add_device(struct device *dev,
struct devfreq_dev_profile *profile,
- struct devfreq_governor *governor,
+ const char *governor_name,
void *data)
{
return NULL;
@@ -225,6 +226,16 @@ static int devfreq_remove_device(struct devfreq *devfreq)
return 0;
}
+static int devfreq_suspend_device(struct devfreq *devfreq)
+{
+ return 0;
+}
+
+static int devfreq_resume_device(struct devfreq *devfreq)
+{
+ return 0;
+}
+
static struct opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags)
{
@@ -243,11 +254,6 @@ static int devfreq_unregister_opp_notifier(struct device *dev,
return -EINVAL;
}
-#define devfreq_powersave NULL
-#define devfreq_performance NULL
-#define devfreq_userspace NULL
-#define devfreq_simple_ondemand NULL
-
#endif /* CONFIG_PM_DEVFREQ */
#endif /* __LINUX_DEVFREQ_H__ */