#define _CPUFREQ_GOVERNOR_H
#include <linux/atomic.h>
+#include <linux/irq_work.h>
#include <linux/cpufreq.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE};
/*
- * Macro for creating governors sysfs routines
- *
- * - gov_sys: One governor instance per whole system
- * - gov_pol: One governor instance per policy
+ * Abbreviations:
+ * dbs: used as a shortform for demand based switching It helps to keep variable
+ * names smaller, simpler
+ * cdbs: common dbs
+ * od_*: On-demand governor
+ * cs_*: Conservative governor
*/
-/* Create attributes */
-#define gov_sys_attr_ro(_name) \
-static struct global_attr _name##_gov_sys = \
-__ATTR(_name, 0444, show_##_name##_gov_sys, NULL)
-
-#define gov_sys_attr_rw(_name) \
-static struct global_attr _name##_gov_sys = \
-__ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys)
-
-#define gov_pol_attr_ro(_name) \
-static struct freq_attr _name##_gov_pol = \
-__ATTR(_name, 0444, show_##_name##_gov_pol, NULL)
-
-#define gov_pol_attr_rw(_name) \
-static struct freq_attr _name##_gov_pol = \
-__ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol)
+/* Governor demand based switching data (per-policy or global). */
+struct dbs_data {
+ int usage_count;
+ void *tuners;
+ unsigned int min_sampling_rate;
+ unsigned int ignore_nice_load;
+ unsigned int sampling_rate;
+ unsigned int sampling_down_factor;
+ unsigned int up_threshold;
+ unsigned int io_is_busy;
-#define gov_sys_pol_attr_rw(_name) \
- gov_sys_attr_rw(_name); \
- gov_pol_attr_rw(_name)
+ struct kobject kobj;
+ struct list_head policy_dbs_list;
+ /*
+ * Protect concurrent updates to governor tunables from sysfs,
+ * policy_dbs_list and usage_count.
+ */
+ struct mutex mutex;
+};
-#define gov_sys_pol_attr_ro(_name) \
- gov_sys_attr_ro(_name); \
- gov_pol_attr_ro(_name)
+/* Governor's specific attributes */
+struct dbs_data;
+struct governor_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct dbs_data *dbs_data, char *buf);
+ ssize_t (*store)(struct dbs_data *dbs_data, const char *buf,
+ size_t count);
+};
-/* Create show/store routines */
-#define show_one(_gov, file_name) \
-static ssize_t show_##file_name##_gov_sys \
-(struct kobject *kobj, struct attribute *attr, char *buf) \
+#define gov_show_one(_gov, file_name) \
+static ssize_t show_##file_name \
+(struct dbs_data *dbs_data, char *buf) \
{ \
- struct _gov##_dbs_tuners *tuners = _gov##_dbs_cdata.gdbs_data->tuners; \
- return sprintf(buf, "%u\n", tuners->file_name); \
-} \
- \
-static ssize_t show_##file_name##_gov_pol \
-(struct cpufreq_policy *policy, char *buf) \
-{ \
- struct dbs_data *dbs_data = policy->governor_data; \
struct _gov##_dbs_tuners *tuners = dbs_data->tuners; \
return sprintf(buf, "%u\n", tuners->file_name); \
}
-#define store_one(_gov, file_name) \
-static ssize_t store_##file_name##_gov_sys \
-(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) \
-{ \
- struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
- return store_##file_name(dbs_data, buf, count); \
-} \
- \
-static ssize_t store_##file_name##_gov_pol \
-(struct cpufreq_policy *policy, const char *buf, size_t count) \
+#define gov_show_one_common(file_name) \
+static ssize_t show_##file_name \
+(struct dbs_data *dbs_data, char *buf) \
{ \
- struct dbs_data *dbs_data = policy->governor_data; \
- return store_##file_name(dbs_data, buf, count); \
+ return sprintf(buf, "%u\n", dbs_data->file_name); \
}
-#define show_store_one(_gov, file_name) \
-show_one(_gov, file_name); \
-store_one(_gov, file_name)
+#define gov_attr_ro(_name) \
+static struct governor_attr _name = \
+__ATTR(_name, 0444, show_##_name, NULL)
-/* create helper routines */
-#define define_get_cpu_dbs_routines(_dbs_info) \
-static struct cpu_dbs_info *get_cpu_cdbs(int cpu) \
-{ \
- return &per_cpu(_dbs_info, cpu).cdbs; \
-} \
- \
-static void *get_cpu_dbs_info_s(int cpu) \
-{ \
- return &per_cpu(_dbs_info, cpu); \
-}
-
-/*
- * Abbreviations:
- * dbs: used as a shortform for demand based switching It helps to keep variable
- * names smaller, simpler
- * cdbs: common dbs
- * od_*: On-demand governor
- * cs_*: Conservative governor
- */
+#define gov_attr_rw(_name) \
+static struct governor_attr _name = \
+__ATTR(_name, 0644, show_##_name, store_##_name)
/* Common to all CPUs of a policy */
-struct cpu_common_dbs_info {
+struct policy_dbs_info {
struct cpufreq_policy *policy;
/*
* Per policy mutex that serializes load evaluation from limit-change
*/
struct mutex timer_mutex;
- ktime_t time_stamp;
- atomic_t skip_work;
+ u64 last_sample_time;
+ s64 sample_delay_ns;
+ atomic_t work_count;
+ struct irq_work irq_work;
struct work_struct work;
+ /* dbs_data may be shared between multiple policy objects */
+ struct dbs_data *dbs_data;
+ struct list_head list;
+ /* Multiplier for increasing sample delay temporarily. */
+ unsigned int rate_mult;
+ /* Status indicators */
+ bool is_shared; /* This object is used by multiple CPUs */
+ bool work_in_progress; /* Work is being queued up or in progress */
};
+static inline void gov_update_sample_delay(struct policy_dbs_info *policy_dbs,
+ unsigned int delay_us)
+{
+ policy_dbs->sample_delay_ns = delay_us * NSEC_PER_USEC;
+}
+
/* Per cpu structures */
struct cpu_dbs_info {
u64 prev_cpu_idle;
* wake-up from idle.
*/
unsigned int prev_load;
- struct timer_list timer;
- struct cpu_common_dbs_info *shared;
-};
-
-struct od_cpu_dbs_info_s {
- struct cpu_dbs_info cdbs;
- struct cpufreq_frequency_table *freq_table;
- unsigned int freq_lo;
- unsigned int freq_lo_jiffies;
- unsigned int freq_hi_jiffies;
- unsigned int rate_mult;
- unsigned int sample_type:1;
-};
-
-struct cs_cpu_dbs_info_s {
- struct cpu_dbs_info cdbs;
- unsigned int down_skip;
- unsigned int requested_freq;
-};
-
-/* Per policy Governors sysfs tunables */
-struct od_dbs_tuners {
- unsigned int ignore_nice_load;
- unsigned int sampling_rate;
- unsigned int sampling_down_factor;
- unsigned int up_threshold;
- unsigned int powersave_bias;
- unsigned int io_is_busy;
-};
-
-struct cs_dbs_tuners {
- unsigned int ignore_nice_load;
- unsigned int sampling_rate;
- unsigned int sampling_down_factor;
- unsigned int up_threshold;
- unsigned int down_threshold;
- unsigned int freq_step;
+ struct update_util_data update_util;
+ struct policy_dbs_info *policy_dbs;
};
/* Common Governor data across policies */
-struct dbs_data;
-struct common_dbs_data {
- /* Common across governors */
- #define GOV_ONDEMAND 0
- #define GOV_CONSERVATIVE 1
- int governor;
- struct attribute_group *attr_group_gov_sys; /* one governor - system */
- struct attribute_group *attr_group_gov_pol; /* one governor - policy */
+struct dbs_governor {
+ struct cpufreq_governor gov;
+ struct kobj_type kobj_type;
/*
* Common data for platforms that don't set
*/
struct dbs_data *gdbs_data;
- struct cpu_dbs_info *(*get_cpu_cdbs)(int cpu);
- void *(*get_cpu_dbs_info_s)(int cpu);
- unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy,
- bool modify_all);
- void (*gov_check_cpu)(int cpu, unsigned int load);
+ unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy);
+ struct policy_dbs_info *(*alloc)(void);
+ void (*free)(struct policy_dbs_info *policy_dbs);
int (*init)(struct dbs_data *dbs_data, bool notify);
void (*exit)(struct dbs_data *dbs_data, bool notify);
-
- /* Governor specific ops, see below */
- void *gov_ops;
-
- /*
- * Protects governor's data (struct dbs_data and struct common_dbs_data)
- */
- struct mutex mutex;
+ void (*start)(struct cpufreq_policy *policy);
};
-/* Governor Per policy data */
-struct dbs_data {
- struct common_dbs_data *cdata;
- unsigned int min_sampling_rate;
- int usage_count;
- void *tuners;
-};
+static inline struct dbs_governor *dbs_governor_of(struct cpufreq_policy *policy)
+{
+ return container_of(policy->governor, struct dbs_governor, gov);
+}
-/* Governor specific ops, will be passed to dbs_data->gov_ops */
+/* Governor specific operations */
struct od_ops {
- void (*powersave_bias_init_cpu)(int cpu);
unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy,
unsigned int freq_next, unsigned int relation);
- void (*freq_increase)(struct cpufreq_policy *policy, unsigned int freq);
};
-static inline int delay_for_sampling_rate(unsigned int sampling_rate)
-{
- int delay = usecs_to_jiffies(sampling_rate);
-
- /* We want all CPUs to do sampling nearly on same jiffy */
- if (num_online_cpus() > 1)
- delay -= jiffies % delay;
-
- return delay;
-}
-
-#define declare_show_sampling_rate_min(_gov) \
-static ssize_t show_sampling_rate_min_gov_sys \
-(struct kobject *kobj, struct attribute *attr, char *buf) \
-{ \
- struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
- return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
-} \
- \
-static ssize_t show_sampling_rate_min_gov_pol \
-(struct cpufreq_policy *policy, char *buf) \
-{ \
- struct dbs_data *dbs_data = policy->governor_data; \
- return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
-}
-
-extern struct mutex cpufreq_governor_lock;
-
-void gov_add_timers(struct cpufreq_policy *policy, unsigned int delay);
-void gov_cancel_work(struct cpu_common_dbs_info *shared);
-void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
-int cpufreq_governor_dbs(struct cpufreq_policy *policy,
- struct common_dbs_data *cdata, unsigned int event);
+unsigned int dbs_update(struct cpufreq_policy *policy);
+int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event);
void od_register_powersave_bias_handler(unsigned int (*f)
(struct cpufreq_policy *, unsigned int, unsigned int),
unsigned int powersave_bias);
void od_unregister_powersave_bias_handler(void);
+ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
+ size_t count);
+void gov_update_cpu_data(struct dbs_data *dbs_data);
#endif /* _CPUFREQ_GOVERNOR_H */
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