first commit

1 files changed, 2015 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq_hotplug.c b/drivers/cpufreq/cpufreq_hotplug.c
new file mode 100644
index 000000000..942a28d09
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_hotplug.c
@@ -0,0 +1,2015 @@
+/*
+ *  drivers/cpufreq/cpufreq_hotplug.c
+ *
+ *  Copyright (C)  2001 Russell King
+ *            (C)  2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
+ *                      Jun Nakajima <jun.nakajima@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpufreq.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/kobject.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/percpu-defs.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/tick.h>
+#include <linux/types.h>
+#include <linux/cpu.h>
+#include <linux/sched.h>
+#include <linux/sched/rt.h>
+#include <linux/kthread.h>
+#include <linux/input.h>	/* <-XXX */
+#include <linux/slab.h>		/* <-XXX */
+#include "mach/mt_cpufreq.h"	/* <-XXX */
+
+#include "cpufreq_governor.h"
+
+/* Hot-plug governor macros */
+#define DEF_FREQUENCY_DOWN_DIFFERENTIAL     (10)
+#define DEF_FREQUENCY_UP_THRESHOLD          (80)
+#define DEF_SAMPLING_DOWN_FACTOR            (1)
+#define MAX_SAMPLING_DOWN_FACTOR            (100000)
+#define MICRO_FREQUENCY_DOWN_DIFFERENTIAL   (15)
+#define MIN_FREQUENCY_DOWN_DIFFERENTIAL     (5)	/* <-XXX */
+#define MAX_FREQUENCY_DOWN_DIFFERENTIAL     (20)	/* <-XXX */
+#define MICRO_FREQUENCY_UP_THRESHOLD        (85)
+#ifdef CONFIG_MTK_SDIOAUTOK_SUPPORT
+#define MICRO_FREQUENCY_MIN_SAMPLE_RATE     (27000)
+#else
+#define MICRO_FREQUENCY_MIN_SAMPLE_RATE     (30000)
+#endif
+#define MIN_FREQUENCY_UP_THRESHOLD          (21)
+#define MAX_FREQUENCY_UP_THRESHOLD          (100)
+
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+/*
+ * cpu hotplug - macro
+ */
+#define DEF_CPU_DOWN_DIFFERENTIAL           (10)
+#define MICRO_CPU_DOWN_DIFFERENTIAL         (10)
+#define MIN_CPU_DOWN_DIFFERENTIAL           (0)
+#define MAX_CPU_DOWN_DIFFERENTIAL           (30)
+
+#define DEF_CPU_UP_THRESHOLD                (90)
+#define MICRO_CPU_UP_THRESHOLD              (90)
+#define MIN_CPU_UP_THRESHOLD                (50)
+#define MAX_CPU_UP_THRESHOLD                (100)
+
+#define DEF_CPU_UP_AVG_TIMES                (10)
+#define MIN_CPU_UP_AVG_TIMES                (1)
+#define MAX_CPU_UP_AVG_TIMES                (20)
+
+#define DEF_CPU_DOWN_AVG_TIMES              (100)
+#define MIN_CPU_DOWN_AVG_TIMES              (20)
+#define MAX_CPU_DOWN_AVG_TIMES              (200)
+
+#define DEF_CPU_INPUT_BOOST_ENABLE          (1)
+#define DEF_CPU_INPUT_BOOST_NUM             (2)
+
+#define DEF_CPU_RUSH_BOOST_ENABLE           (1)
+
+#define DEF_CPU_RUSH_THRESHOLD              (98)
+#define MICRO_CPU_RUSH_THRESHOLD            (98)
+#define MIN_CPU_RUSH_THRESHOLD              (80)
+#define MAX_CPU_RUSH_THRESHOLD              (100)
+
+#define DEF_CPU_RUSH_AVG_TIMES              (5)
+#define MIN_CPU_RUSH_AVG_TIMES              (1)
+#define MAX_CPU_RUSH_AVG_TIMES              (10)
+
+#define DEF_CPU_RUSH_TLP_TIMES              (5)
+#define MIN_CPU_RUSH_TLP_TIMES              (1)
+#define MAX_CPU_RUSH_TLP_TIMES              (10)
+
+/* #define DEBUG_LOG */
+
+/*
+ * cpu hotplug - enum
+ */
+typedef enum {
+	CPU_HOTPLUG_WORK_TYPE_NONE = 0,
+	CPU_HOTPLUG_WORK_TYPE_BASE,
+	CPU_HOTPLUG_WORK_TYPE_LIMIT,
+	CPU_HOTPLUG_WORK_TYPE_UP,
+	CPU_HOTPLUG_WORK_TYPE_DOWN,
+	CPU_HOTPLUG_WORK_TYPE_RUSH,
+} cpu_hotplug_work_type_t;
+
+/*
+ * cpu hotplug - global variable, function declaration
+ */
+static DEFINE_MUTEX(hp_mutex);
+DEFINE_MUTEX(hp_onoff_mutex);
+
+int g_cpus_sum_load_current = 0;	/* set global for information purpose */
+#ifdef CONFIG_HOTPLUG_CPU
+
+static long g_cpu_up_sum_load;
+static int g_cpu_up_count;
+static int g_cpu_up_load_index;
+static long g_cpu_up_load_history[MAX_CPU_UP_AVG_TIMES] = { 0 };
+
+static long g_cpu_down_sum_load;
+static int g_cpu_down_count;
+static int g_cpu_down_load_index;
+static long g_cpu_down_load_history[MAX_CPU_DOWN_AVG_TIMES] = { 0 };
+
+static cpu_hotplug_work_type_t g_trigger_hp_work;
+static unsigned int g_next_hp_action;
+static struct delayed_work hp_work;
+struct workqueue_struct *hp_wq = NULL;
+
+static int g_tlp_avg_current;	/* set global for information purpose */
+static int g_tlp_avg_sum;
+static int g_tlp_avg_count;
+static int g_tlp_avg_index;
+static int g_tlp_avg_average;	/* set global for information purpose */
+static int g_tlp_avg_history[MAX_CPU_RUSH_TLP_TIMES] = { 0 };
+
+static int g_tlp_iowait_av;
+
+static int g_cpu_rush_count;
+
+static void hp_reset_strategy_nolock(void);
+static void hp_reset_strategy(void);
+
+#else				/* #ifdef CONFIG_HOTPLUG_CPU */
+
+static void hp_reset_strategy_nolock(void)
+{
+};
+
+#endif				/* #ifdef CONFIG_HOTPLUG_CPU */
+
+/* dvfs - function declaration */
+static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq);
+
+#if defined(CONFIG_THERMAL_LIMIT_TEST)
+extern unsigned int mt_cpufreq_thermal_test_limited_load(void);
+#endif
+
+static unsigned int dbs_ignore = 1;
+static unsigned int dbs_thermal_limited;
+static unsigned int dbs_thermal_limited_freq;
+
+/* dvfs thermal limit */
+void dbs_freq_thermal_limited(unsigned int limited, unsigned int freq)
+{
+	dbs_thermal_limited = limited;
+	dbs_thermal_limited_freq = freq;
+}
+EXPORT_SYMBOL(dbs_freq_thermal_limited);
+
+
+void (*cpufreq_freq_check) (enum mt_cpu_dvfs_id id) = NULL;
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+
+static DEFINE_PER_CPU(struct hp_cpu_dbs_info_s, hp_cpu_dbs_info);
+
+static struct hp_ops hp_ops;
+
+#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_HOTPLUG
+static struct cpufreq_governor cpufreq_gov_hotplug;
+#endif
+
+static unsigned int default_powersave_bias;
+
+static void hotplug_powersave_bias_init_cpu(int cpu)
+{
+	struct hp_cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info, cpu);
+
+	dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
+	dbs_info->freq_lo = 0;
+}
+
+/*
+ * Not all CPUs want IO time to be accounted as busy; this depends on how
+ * efficient idling at a higher frequency/voltage is.
+ * Pavel Machek says this is not so for various generations of AMD and old
+ * Intel systems.
+ * Mike Chan (android.com) claims this is also not true for ARM.
+ * Because of this, whitelist specific known (series) of CPUs by default, and
+ * leave all others up to the user.
+ */
+static int should_io_be_busy(void)
+{
+#if defined(CONFIG_X86)
+	/*
+	 * For Intel, Core 2 (model 15) and later have an efficient idle.
+	 */
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+	    boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model >= 15)
+		return 1;
+#endif
+	return 1;		/* io wait time should be subtracted from idle time // <-XXX */
+}
+
+/*
+ * Find right freq to be set now with powersave_bias on.
+ * Returns the freq_hi to be used right now and will set freq_hi_jiffies,
+ * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
+ */
+static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
+						  unsigned int freq_next, unsigned int relation)
+{
+	unsigned int freq_req, freq_reduc, freq_avg;
+	unsigned int freq_hi, freq_lo;
+	unsigned int index = 0;
+	unsigned int jiffies_total, jiffies_hi, jiffies_lo;
+	struct hp_cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info,
+						      policy->cpu);
+	struct dbs_data *dbs_data = policy->governor_data;
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+
+	if (!dbs_info->freq_table) {
+		dbs_info->freq_lo = 0;
+		dbs_info->freq_lo_jiffies = 0;
+		return freq_next;
+	}
+
+	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, relation, &index);
+	freq_req = dbs_info->freq_table[index].frequency;
+	freq_reduc = freq_req * hp_tuners->powersave_bias / 1000;
+	freq_avg = freq_req - freq_reduc;
+
+	/* Find freq bounds for freq_avg in freq_table */
+	index = 0;
+	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
+				       CPUFREQ_RELATION_H, &index);
+	freq_lo = dbs_info->freq_table[index].frequency;
+	index = 0;
+	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
+				       CPUFREQ_RELATION_L, &index);
+	freq_hi = dbs_info->freq_table[index].frequency;
+
+	/* Find out how long we have to be in hi and lo freqs */
+	if (freq_hi == freq_lo) {
+		dbs_info->freq_lo = 0;
+		dbs_info->freq_lo_jiffies = 0;
+		return freq_lo;
+	}
+	jiffies_total = usecs_to_jiffies(hp_tuners->sampling_rate);
+	jiffies_hi = (freq_avg - freq_lo) * jiffies_total;
+	jiffies_hi += ((freq_hi - freq_lo) / 2);
+	jiffies_hi /= (freq_hi - freq_lo);
+	jiffies_lo = jiffies_total - jiffies_hi;
+	dbs_info->freq_lo = freq_lo;
+	dbs_info->freq_lo_jiffies = jiffies_lo;
+	dbs_info->freq_hi_jiffies = jiffies_hi;
+	return freq_hi;
+}
+
+static void hotplug_powersave_bias_init(void)
+{
+	int i;
+	for_each_online_cpu(i) {
+		hotplug_powersave_bias_init_cpu(i);
+	}
+}
+
+static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq)
+{
+	struct dbs_data *dbs_data = p->governor_data;
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+
+	if (hp_tuners->powersave_bias)
+		freq = hp_ops.powersave_bias_target(p, freq, CPUFREQ_RELATION_H);
+	else if (p->cur == p->max) {
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+		if (dbs_ignore == 0) {
+			if ((dbs_thermal_limited == 1) && (freq > dbs_thermal_limited_freq)) {
+				freq = dbs_thermal_limited_freq;
+				pr_debug("[dbs_freq_increase] thermal limit freq = %d\n", freq);
+			}
+
+			dbs_ignore = 1;
+		} else
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+			return;
+	}
+
+	__cpufreq_driver_target(p, freq, hp_tuners->powersave_bias ?
+				CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
+}
+
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+/*
+ * cpu hotplug - function definition
+ */
+int hp_get_dynamic_cpu_hotplug_enable(void)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return 0;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return 0;
+
+	return !(hp_tuners->is_cpu_hotplug_disable);
+}
+EXPORT_SYMBOL(hp_get_dynamic_cpu_hotplug_enable);
+
+void hp_set_dynamic_cpu_hotplug_enable(int enable)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	if (enable > 1 || enable < 0)
+		return;
+
+	mutex_lock(&hp_mutex);
+
+	if (hp_tuners->is_cpu_hotplug_disable && enable)
+		hp_reset_strategy_nolock();
+
+	hp_tuners->is_cpu_hotplug_disable = !enable;
+	mutex_unlock(&hp_mutex);
+}
+EXPORT_SYMBOL(hp_set_dynamic_cpu_hotplug_enable);
+
+void hp_limited_cpu_num(int num)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	if (num > num_possible_cpus() || num < 1)
+		return;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_num_limit = num;
+	mutex_unlock(&hp_mutex);
+}
+EXPORT_SYMBOL(hp_limited_cpu_num);
+
+void hp_based_cpu_num(int num)
+{
+	unsigned int online_cpus_count;
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	if (num > num_possible_cpus() || num < 1)
+		return;
+
+	mutex_lock(&hp_mutex);
+
+	hp_tuners->cpu_num_base = num;
+	online_cpus_count = num_online_cpus();
+#ifdef CONFIG_HOTPLUG_CPU
+
+	if (online_cpus_count < num && online_cpus_count < hp_tuners->cpu_num_limit) {
+		struct hp_cpu_dbs_info_s *dbs_info;
+		struct cpufreq_policy *policy;
+
+		dbs_info = &per_cpu(hp_cpu_dbs_info, 0);	/* TODO: FIXME, cpu = 0 */
+		policy = dbs_info->cdbs.cur_policy;
+
+		dbs_freq_increase(policy, policy->max);
+		g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_BASE;
+		/* schedule_delayed_work_on(0, &hp_work, 0); */
+		if (hp_wq == NULL)
+			pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+		else
+			queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+	}
+#endif
+
+	mutex_unlock(&hp_mutex);
+}
+EXPORT_SYMBOL(hp_based_cpu_num);
+
+int hp_get_cpu_rush_boost_enable(void)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return 0;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return 0;
+
+	return hp_tuners->cpu_rush_boost_enable;
+}
+EXPORT_SYMBOL(hp_get_cpu_rush_boost_enable);
+
+void hp_set_cpu_rush_boost_enable(int enable)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	if (enable > 1 || enable < 0)
+		return;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_rush_boost_enable = enable;
+	mutex_unlock(&hp_mutex);
+}
+EXPORT_SYMBOL(hp_set_cpu_rush_boost_enable);
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+#ifdef CONFIG_MTK_SCHED_RQAVG_KS
+extern void sched_get_nr_running_avg(int *avg, int *iowait_avg);
+#else				/* #ifdef CONFIG_MTK_SCHED_RQAVG_KS */
+static void sched_get_nr_running_avg(int *avg, int *iowait_avg)
+{
+	*avg = num_possible_cpus() * 100;
+}
+#endif				/* #ifdef CONFIG_MTK_SCHED_RQAVG_KS */
+
+static void hp_reset_strategy_nolock(void)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	g_cpu_up_count = 0;
+	g_cpu_up_sum_load = 0;
+	g_cpu_up_load_index = 0;
+	g_cpu_up_load_history[hp_tuners->cpu_up_avg_times - 1] = 0;
+	/* memset(g_cpu_up_load_history, 0, sizeof(long) * MAX_CPU_UP_AVG_TIMES); */
+
+	g_cpu_down_count = 0;
+	g_cpu_down_sum_load = 0;
+	g_cpu_down_load_index = 0;
+	g_cpu_down_load_history[hp_tuners->cpu_down_avg_times - 1] = 0;
+	/* memset(g_cpu_down_load_history, 0, sizeof(long) * MAX_CPU_DOWN_AVG_TIMES); */
+
+	g_tlp_avg_sum = 0;
+	g_tlp_avg_count = 0;
+	g_tlp_avg_index = 0;
+	g_tlp_avg_history[hp_tuners->cpu_rush_tlp_times - 1] = 0;
+	g_cpu_rush_count = 0;
+
+	g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_NONE;
+}
+
+static void hp_reset_strategy(void)
+{
+	mutex_lock(&hp_mutex);
+
+	hp_reset_strategy_nolock();
+
+	mutex_unlock(&hp_mutex);
+}
+
+static void hp_work_handler(struct work_struct *work)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	if (mutex_trylock(&hp_onoff_mutex)) {
+		if (!hp_tuners->is_cpu_hotplug_disable) {
+			unsigned int online_cpus_count = num_online_cpus();
+			unsigned int i;
+
+			pr_debug
+			    ("[power/hotplug] hp_work_handler(%d)(%d)(%d)(%d)(%ld)(%ld)(%d)(%d) begin\n",
+			     g_trigger_hp_work, g_tlp_avg_average, g_tlp_avg_current,
+			     g_cpus_sum_load_current, g_cpu_up_sum_load, g_cpu_down_sum_load,
+			     hp_tuners->cpu_num_base, hp_tuners->cpu_num_limit);
+
+			switch (g_trigger_hp_work) {
+			case CPU_HOTPLUG_WORK_TYPE_RUSH:
+				for (i = online_cpus_count;
+				     i < min(g_next_hp_action, hp_tuners->cpu_num_limit); ++i)
+					cpu_up(i);
+
+				break;
+
+			case CPU_HOTPLUG_WORK_TYPE_BASE:
+				for (i = online_cpus_count;
+				     i < min(hp_tuners->cpu_num_base, hp_tuners->cpu_num_limit);
+				     ++i)
+					cpu_up(i);
+
+				break;
+
+			case CPU_HOTPLUG_WORK_TYPE_LIMIT:
+				for (i = online_cpus_count - 1; i >= hp_tuners->cpu_num_limit; --i)
+					cpu_down(i);
+
+				break;
+
+			case CPU_HOTPLUG_WORK_TYPE_UP:
+				for (i = online_cpus_count; i < g_next_hp_action; ++i)
+					cpu_up(i);
+
+				break;
+
+			case CPU_HOTPLUG_WORK_TYPE_DOWN:
+				for (i = online_cpus_count - 1; i >= g_next_hp_action; --i)
+					cpu_down(i);
+
+				break;
+
+			default:
+				for (i = online_cpus_count;
+				     i < min(hp_tuners->cpu_input_boost_num,
+					     hp_tuners->cpu_num_limit); ++i)
+					cpu_up(i);
+
+				/* pr_debug("[power/hotplug] cpu input boost\n"); */
+				break;
+			}
+
+			hp_reset_strategy();
+			dbs_ignore = 0;	/* force trigger frequency scaling */
+
+			pr_debug("[power/hotplug] hp_work_handler end\n");
+
+			/*
+			   if (g_next_hp_action) // turn on CPU
+			   {
+			   if (online_cpus_count < num_possible_cpus())
+			   {
+			   pr_debug("hp_work_handler: cpu_up(%d) kick off\n", online_cpus_count);
+			   cpu_up(online_cpus_count);
+			   hp_reset_strategy();
+			   pr_debug("hp_work_handler: cpu_up(%d) completion\n", online_cpus_count);
+
+			   dbs_ignore = 0; // force trigger frequency scaling
+			   }
+			   }
+			   else // turn off CPU
+			   {
+			   if (online_cpus_count > 1)
+			   {
+			   pr_debug("hp_work_handler: cpu_down(%d) kick off\n", (online_cpus_count - 1));
+			   cpu_down((online_cpus_count - 1));
+			   hp_reset_strategy();
+			   pr_debug("hp_work_handler: cpu_down(%d) completion\n", (online_cpus_count - 1));
+
+			   dbs_ignore = 0; // force trigger frequency scaling
+			   }
+			   }
+			 */
+		}
+
+		mutex_unlock(&hp_onoff_mutex);
+	}
+}
+#endif				/* #ifdef CONFIG_HOTPLUG_CPU */
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+
+/*
+ * Every sampling_rate, we check, if current idle time is less than 20%
+ * (default), then we try to increase frequency. Every sampling_rate, we look
+ * for the lowest frequency which can sustain the load while keeping idle time
+ * over 30%. If such a frequency exist, we try to decrease to this frequency.
+ *
+ * Any frequency increase takes it to the maximum frequency. Frequency reduction
+ * happens at minimum steps of 5% (default) of current frequency
+ */
+static void hp_check_cpu(int cpu, unsigned int load_freq)
+{
+	struct hp_cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info, cpu);
+	struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy;
+	struct dbs_data *dbs_data = policy->governor_data;
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	dbs_info->freq_lo = 0;
+
+	/* pr_emerg("***** cpu: %d, load_freq: %u, smp_processor_id: %d *****\n", cpu, load_freq, smp_processor_id()); */
+
+	/* Check for frequency increase */
+	if (load_freq > hp_tuners->up_threshold * policy->cur) {
+		/* If switching to max speed, apply sampling_down_factor */
+		if (policy->cur < policy->max)
+			dbs_info->rate_mult = hp_tuners->sampling_down_factor;
+		dbs_freq_increase(policy, policy->max);
+		goto hp_check;	/* <-XXX */
+	}
+
+	/* Check for frequency decrease */
+	/* if we cannot reduce the frequency anymore, break out early */
+	if (policy->cur == policy->min)
+		goto hp_check;	/* <-XXX */
+
+	/*
+	 * The optimal frequency is the frequency that is the lowest that can
+	 * support the current CPU usage without triggering the up policy. To be
+	 * safe, we focus 10 points under the threshold.
+	 */
+	if (load_freq < hp_tuners->adj_up_threshold * policy->cur) {
+		unsigned int freq_next;
+		freq_next = load_freq / hp_tuners->adj_up_threshold;
+
+		/* No longer fully busy, reset rate_mult */
+		dbs_info->rate_mult = 1;
+
+		if (freq_next < policy->min)
+			freq_next = policy->min;
+
+		if (!hp_tuners->powersave_bias) {
+			__cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
+		} else {
+			freq_next = hp_ops.powersave_bias_target(policy, freq_next,
+								 CPUFREQ_RELATION_L);
+			__cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
+		}
+	}
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+ hp_check:{
+#ifdef CONFIG_HOTPLUG_CPU
+		long cpus_sum_load_last_up = 0;
+		long cpus_sum_load_last_down = 0;
+		unsigned int online_cpus_count;
+
+		int v_tlp_avg_last = 0;
+#endif
+
+		/* If Hot Plug policy disable, return directly */
+		if (hp_tuners->is_cpu_hotplug_disable)
+			return;
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+		if (g_trigger_hp_work != CPU_HOTPLUG_WORK_TYPE_NONE)
+			return;
+
+		mutex_lock(&hp_mutex);
+
+		online_cpus_count = num_online_cpus();
+
+		sched_get_nr_running_avg(&g_tlp_avg_current, &g_tlp_iowait_av);
+
+		v_tlp_avg_last = g_tlp_avg_history[g_tlp_avg_index];
+		g_tlp_avg_history[g_tlp_avg_index] = g_tlp_avg_current;
+		g_tlp_avg_sum += g_tlp_avg_current;
+
+		g_tlp_avg_index =
+		    (g_tlp_avg_index + 1 ==
+		     hp_tuners->cpu_rush_tlp_times) ? 0 : g_tlp_avg_index + 1;
+		g_tlp_avg_count++;
+
+		if (g_tlp_avg_count >= hp_tuners->cpu_rush_tlp_times) {
+			if (g_tlp_avg_sum > v_tlp_avg_last)
+				g_tlp_avg_sum -= v_tlp_avg_last;
+			else
+				g_tlp_avg_sum = 0;
+		}
+
+		g_tlp_avg_average = g_tlp_avg_sum / hp_tuners->cpu_rush_tlp_times;
+
+		if (hp_tuners->cpu_rush_boost_enable) {
+			/* pr_debug("@@@@@@@@@@@@@@@@@@@@@@@@@@@ tlp: %d @@@@@@@@@@@@@@@@@@@@@@@@@@@\n", g_tlp_avg_average); */
+
+			if (g_cpus_sum_load_current >
+			    hp_tuners->cpu_rush_threshold * online_cpus_count)
+				++g_cpu_rush_count;
+			else
+				g_cpu_rush_count = 0;
+
+			if ((g_cpu_rush_count >= hp_tuners->cpu_rush_avg_times) &&
+			    (online_cpus_count * 100 < g_tlp_avg_average) &&
+			    (online_cpus_count < hp_tuners->cpu_num_limit) &&
+			    (online_cpus_count < num_possible_cpus())) {
+				dbs_freq_increase(policy, policy->max);
+				pr_debug("dbs_check_cpu: turn on CPU\n");
+				g_next_hp_action =
+				    g_tlp_avg_average / 100 + (g_tlp_avg_average % 100 ? 1 : 0);
+
+				if (g_next_hp_action > num_possible_cpus())
+					g_next_hp_action = num_possible_cpus();
+
+				g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_RUSH;
+				/* schedule_delayed_work_on(0, &hp_work, 0); */
+				if (hp_wq == NULL)
+					pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+				else
+					queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+
+				goto hp_check_end;
+			}
+		}
+
+		if (online_cpus_count < hp_tuners->cpu_num_base
+		    && online_cpus_count < hp_tuners->cpu_num_limit) {
+			dbs_freq_increase(policy, policy->max);
+			pr_debug("dbs_check_cpu: turn on CPU\n");
+			g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_BASE;
+			/* schedule_delayed_work_on(0, &hp_work, 0); */
+			if (hp_wq == NULL)
+				pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+			else
+				queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+
+			goto hp_check_end;
+		}
+
+		if (online_cpus_count > hp_tuners->cpu_num_limit) {
+			dbs_freq_increase(policy, policy->max);
+			pr_debug("dbs_check_cpu: turn off CPU\n");
+			g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_LIMIT;
+			/* schedule_delayed_work_on(0, &hp_work, 0); */
+			if (hp_wq == NULL)
+				pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+			else
+				queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+
+			goto hp_check_end;
+		}
+
+		/* Check CPU loading to power up slave CPU */
+		if (online_cpus_count < num_possible_cpus()) {
+			cpus_sum_load_last_up = g_cpu_up_load_history[g_cpu_up_load_index];
+			g_cpu_up_load_history[g_cpu_up_load_index] = g_cpus_sum_load_current;
+			g_cpu_up_sum_load += g_cpus_sum_load_current;
+
+			g_cpu_up_count++;
+			g_cpu_up_load_index =
+			    (g_cpu_up_load_index + 1 ==
+			     hp_tuners->cpu_up_avg_times) ? 0 : g_cpu_up_load_index + 1;
+
+			if (g_cpu_up_count >= hp_tuners->cpu_up_avg_times) {
+				if (g_cpu_up_sum_load > cpus_sum_load_last_up)
+					g_cpu_up_sum_load -= cpus_sum_load_last_up;
+				else
+					g_cpu_up_sum_load = 0;
+
+				/* g_cpu_up_sum_load /= hp_tuners->cpu_up_avg_times; */
+				if (g_cpu_up_sum_load >
+				    (hp_tuners->cpu_up_threshold * online_cpus_count *
+				     hp_tuners->cpu_up_avg_times)) {
+					if (online_cpus_count < hp_tuners->cpu_num_limit) {
+#ifdef DEBUG_LOG
+						pr_debug("dbs_check_cpu: g_cpu_up_sum_load = %d\n",
+							 g_cpu_up_sum_load);
+#endif
+						dbs_freq_increase(policy, policy->max);
+						pr_debug("dbs_check_cpu: turn on CPU\n");
+						g_next_hp_action = online_cpus_count + 1;
+						g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_UP;
+						/* schedule_delayed_work_on(0, &hp_work, 0); */
+						if (hp_wq == NULL)
+							pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+						else
+							queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+
+						goto hp_check_end;
+					}
+				}
+			}
+#ifdef DEBUG_LOG
+			pr_debug("dbs_check_cpu: g_cpu_up_count = %d, g_cpu_up_sum_load = %d\n",
+				 g_cpu_up_count, g_cpu_up_sum_load);
+			pr_debug("dbs_check_cpu: cpu_up_threshold = %d\n",
+				 (hp_tuners->cpu_up_threshold * online_cpus_count));
+#endif
+
+		}
+
+		/* Check CPU loading to power down slave CPU */
+		if (online_cpus_count > 1) {
+			cpus_sum_load_last_down = g_cpu_down_load_history[g_cpu_down_load_index];
+			g_cpu_down_load_history[g_cpu_down_load_index] = g_cpus_sum_load_current;
+			g_cpu_down_sum_load += g_cpus_sum_load_current;
+
+			g_cpu_down_count++;
+			g_cpu_down_load_index =
+			    (g_cpu_down_load_index + 1 ==
+			     hp_tuners->cpu_down_avg_times) ? 0 : g_cpu_down_load_index + 1;
+
+			if (g_cpu_down_count >= hp_tuners->cpu_down_avg_times) {
+				long cpu_down_threshold;
+
+				if (g_cpu_down_sum_load > cpus_sum_load_last_down)
+					g_cpu_down_sum_load -= cpus_sum_load_last_down;
+				else
+					g_cpu_down_sum_load = 0;
+
+				g_next_hp_action = online_cpus_count;
+				cpu_down_threshold =
+				    ((hp_tuners->cpu_up_threshold -
+				      hp_tuners->cpu_down_differential) *
+				     hp_tuners->cpu_down_avg_times);
+
+				while ((g_cpu_down_sum_load <
+					cpu_down_threshold * (g_next_hp_action - 1)) &&
+				       /* (g_next_hp_action > tlp_cpu_num) && */
+				       (g_next_hp_action > hp_tuners->cpu_num_base))
+					--g_next_hp_action;
+
+				/* pr_debug("### g_next_hp_action: %d, tlp_cpu_num: %d, g_cpu_down_sum_load / hp_tuners->cpu_down_avg_times: %d ###\n", g_next_hp_action, tlp_cpu_num, g_cpu_down_sum_load / hp_tuners->cpu_down_avg_times); */
+				if (g_next_hp_action < online_cpus_count) {
+#ifdef DEBUG_LOG
+					pr_debug("dbs_check_cpu: g_cpu_down_sum_load = %d\n",
+						 g_cpu_down_sum_load);
+#endif
+					dbs_freq_increase(policy, policy->max);
+					pr_debug("dbs_check_cpu: turn off CPU\n");
+					g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_DOWN;
+					/* schedule_delayed_work_on(0, &hp_work, 0); */
+					if (hp_wq == NULL)
+						pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+					else
+						queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+				}
+			}
+#ifdef DEBUG_LOG
+			pr_debug("dbs_check_cpu: g_cpu_down_count = %d, g_cpu_down_sum_load = %d\n",
+				 g_cpu_down_count, g_cpu_down_sum_load);
+			pr_debug("dbs_check_cpu: cpu_down_threshold = %d\n",
+				 ((hp_tuners->cpu_up_threshold -
+				   hp_tuners->cpu_down_differential) * (online_cpus_count - 1)));
+#endif
+		}
+
+ hp_check_end:
+		mutex_unlock(&hp_mutex);
+
+#endif				/* #ifdef CONFIG_HOTPLUG_CPU */
+	}
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+}
+
+static void hp_dbs_timer(struct work_struct *work)
+{
+	struct hp_cpu_dbs_info_s *dbs_info =
+	    container_of(work, struct hp_cpu_dbs_info_s, cdbs.work.work);
+	unsigned int cpu = dbs_info->cdbs.cur_policy->cpu;
+	struct hp_cpu_dbs_info_s *core_dbs_info = &per_cpu(hp_cpu_dbs_info,
+							   cpu);
+	struct dbs_data *dbs_data = dbs_info->cdbs.cur_policy->governor_data;
+	struct hp_dbs_tuners *hp_tuners;
+
+	int delay = 0, sample_type = core_dbs_info->sample_type;
+	bool modify_all = true;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	mutex_lock(&core_dbs_info->cdbs.timer_mutex);
+	if (!need_load_eval(&core_dbs_info->cdbs, hp_tuners->sampling_rate)) {
+		modify_all = false;
+		goto max_delay;
+	}
+
+	/* Common NORMAL_SAMPLE setup */
+	core_dbs_info->sample_type = HP_NORMAL_SAMPLE;
+	if (sample_type == HP_SUB_SAMPLE) {
+		delay = core_dbs_info->freq_lo_jiffies;
+		__cpufreq_driver_target(core_dbs_info->cdbs.cur_policy,
+					core_dbs_info->freq_lo, CPUFREQ_RELATION_H);
+	} else {
+		dbs_check_cpu(dbs_data, cpu);
+		if (core_dbs_info->freq_lo) {
+			/* Setup timer for SUB_SAMPLE */
+			core_dbs_info->sample_type = HP_SUB_SAMPLE;
+			delay = core_dbs_info->freq_hi_jiffies;
+		}
+	}
+
+ max_delay:
+	if (!delay)
+		delay = delay_for_sampling_rate(hp_tuners->sampling_rate
+						* core_dbs_info->rate_mult);
+
+	gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, delay, modify_all);
+	mutex_unlock(&core_dbs_info->cdbs.timer_mutex);
+
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+	/* for downgrade */ /* TODO: FIXME */
+	if (cpufreq_freq_check)
+		cpufreq_freq_check(0);	/* TODO: FIXME, fix cpuid = 0 */
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+}
+
+/************************** sysfs interface ************************/
+static struct common_dbs_data hp_dbs_cdata;
+
+/**
+ * update_sampling_rate - update sampling rate effective immediately if needed.
+ * @new_rate: new sampling rate
+ *
+ * If new rate is smaller than the old, simply updating
+ * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the
+ * original sampling_rate was 1 second and the requested new sampling rate is 10
+ * ms because the user needs immediate reaction from hotplug governor, but not
+ * sure if higher frequency will be required or not, then, the governor may
+ * change the sampling rate too late; up to 1 second later. Thus, if we are
+ * reducing the sampling rate, we need to make the new value effective
+ * immediately.
+ */
+static void update_sampling_rate(struct dbs_data *dbs_data, unsigned int new_rate)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+
+	hp_tuners->sampling_rate = new_rate = max(new_rate, dbs_data->min_sampling_rate);
+
+	{
+		struct cpufreq_policy *policy;
+		struct hp_cpu_dbs_info_s *dbs_info;
+		unsigned long next_sampling, appointed_at;
+
+		policy = cpufreq_cpu_get(0);
+		if (!policy)
+			return;
+		if (policy->governor != &cpufreq_gov_hotplug) {
+			cpufreq_cpu_put(policy);
+			return;
+		}
+		dbs_info = &per_cpu(hp_cpu_dbs_info, 0);
+		cpufreq_cpu_put(policy);
+
+		mutex_lock(&dbs_info->cdbs.timer_mutex);
+
+		if (!delayed_work_pending(&dbs_info->cdbs.work)) {
+			mutex_unlock(&dbs_info->cdbs.timer_mutex);
+			return;
+		}
+
+		next_sampling = jiffies + usecs_to_jiffies(new_rate);
+		appointed_at = dbs_info->cdbs.work.timer.expires;
+
+		if (time_before(next_sampling, appointed_at)) {
+
+			mutex_unlock(&dbs_info->cdbs.timer_mutex);
+			cancel_delayed_work_sync(&dbs_info->cdbs.work);
+			mutex_lock(&dbs_info->cdbs.timer_mutex);
+
+			gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy,
+				       usecs_to_jiffies(new_rate), true);
+
+		}
+		mutex_unlock(&dbs_info->cdbs.timer_mutex);
+	}
+}
+
+void hp_enable_timer(int enable)
+{
+#if 1
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data; /* TODO: FIXME, cpu = 0 */
+	static unsigned int sampling_rate_backup = 0;
+
+	if (!dbs_data || dbs_data->cdata->governor != GOV_HOTPLUG || (enable && !sampling_rate_backup))
+		return;
+
+	if (enable)
+		update_sampling_rate(dbs_data, sampling_rate_backup);
+	else {
+		struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+
+		sampling_rate_backup = hp_tuners->sampling_rate;
+		update_sampling_rate(dbs_data, 30000 * 100);
+	}
+#else
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data; /* TODO: FIXME, cpu = 0 */
+	int cpu = 0;
+	struct cpufreq_policy *policy;
+	struct hp_dbs_tuners *hp_tuners;
+	struct hp_cpu_dbs_info_s *dbs_info;
+
+	policy = cpufreq_cpu_get(cpu);
+	if (!policy)
+		continue;
+	if (policy->governor != &cpufreq_gov_hotplug) {
+		cpufreq_cpu_put(policy);
+		continue;
+	}
+	dbs_info = &per_cpu(hp_cpu_dbs_info, cpu);
+	cpufreq_cpu_put(policy);
+
+	if (enable) {
+		hp_tuners = dbs_data->tuners;
+		mutex_lock(&dbs_info->cdbs.timer_mutex);
+		gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, usecs_to_jiffies(hp_tuners->sampling_rate), true);
+		mutex_unlock(&dbs_info->cdbs.timer_mutex);
+	} else
+		cancel_delayed_work_sync(&dbs_info->cdbs.work);
+	}
+#endif
+}
+EXPORT_SYMBOL(hp_enable_timer);
+
+static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+	if (ret != 1)
+		return -EINVAL;
+
+	update_sampling_rate(dbs_data, input);
+	return count;
+}
+
+static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	unsigned int j;
+
+	ret = sscanf(buf, "%u", &input);
+	if (ret != 1)
+		return -EINVAL;
+	hp_tuners->io_is_busy = !!input;
+
+	/* we need to re-evaluate prev_cpu_idle */
+	for_each_online_cpu(j) {
+		struct hp_cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info,
+							      j);
+		dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
+								 &dbs_info->cdbs.prev_cpu_wall,
+								 hp_tuners->io_is_busy);
+	}
+	return count;
+}
+
+static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || input < MIN_FREQUENCY_UP_THRESHOLD)
+		return -EINVAL;
+
+	/* Calculate the new adj_up_threshold */
+	hp_tuners->adj_up_threshold += input;
+	hp_tuners->adj_up_threshold -= hp_tuners->up_threshold;
+
+	hp_tuners->up_threshold = input;
+	return count;
+}
+
+static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input, j;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
+		return -EINVAL;
+	hp_tuners->sampling_down_factor = input;
+
+	/* Reset down sampling multiplier in case it was active */
+	for_each_online_cpu(j) {
+		struct hp_cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info,
+							      j);
+		dbs_info->rate_mult = 1;
+	}
+	return count;
+}
+
+static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+
+	unsigned int j;
+
+	ret = sscanf(buf, "%u", &input);
+	if (ret != 1)
+		return -EINVAL;
+
+	if (input > 1)
+		input = 1;
+
+	if (input == hp_tuners->ignore_nice_load)	/* nothing to do */
+		return count;
+
+	hp_tuners->ignore_nice_load = input;
+
+	/* we need to re-evaluate prev_cpu_idle */
+	for_each_online_cpu(j) {
+		struct hp_cpu_dbs_info_s *dbs_info;
+		dbs_info = &per_cpu(hp_cpu_dbs_info, j);
+		dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
+								 &dbs_info->cdbs.prev_cpu_wall,
+								 hp_tuners->io_is_busy);
+		if (hp_tuners->ignore_nice_load)
+			dbs_info->cdbs.prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+
+	}
+	return count;
+}
+
+static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1)
+		return -EINVAL;
+
+	if (input > 1000)
+		input = 1000;
+
+	hp_tuners->powersave_bias = input;
+	hotplug_powersave_bias_init();
+	return count;
+}
+
+show_store_one(hp, sampling_rate);
+show_store_one(hp, io_is_busy);
+show_store_one(hp, up_threshold);
+show_store_one(hp, sampling_down_factor);
+show_store_one(hp, ignore_nice_load);
+show_store_one(hp, powersave_bias);
+declare_show_sampling_rate_min(hp);
+
+gov_sys_pol_attr_rw(sampling_rate);
+gov_sys_pol_attr_rw(io_is_busy);
+gov_sys_pol_attr_rw(up_threshold);
+gov_sys_pol_attr_rw(sampling_down_factor);
+gov_sys_pol_attr_rw(ignore_nice_load);
+gov_sys_pol_attr_rw(powersave_bias);
+gov_sys_pol_attr_ro(sampling_rate_min);
+
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+static ssize_t store_down_differential(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1
+	    || input > MAX_FREQUENCY_DOWN_DIFFERENTIAL || input < MIN_FREQUENCY_DOWN_DIFFERENTIAL)
+		return -EINVAL;
+
+	hp_tuners->down_differential = input;
+
+	return count;
+}
+
+/*
+ * cpu hotplug - function definition of sysfs
+ */
+static ssize_t store_cpu_up_threshold(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_UP_THRESHOLD || input < MIN_CPU_UP_THRESHOLD)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_up_threshold = input;
+	hp_reset_strategy_nolock();
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_down_differential(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_DOWN_DIFFERENTIAL || input < MIN_CPU_DOWN_DIFFERENTIAL)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_down_differential = input;
+	hp_reset_strategy_nolock();
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_up_avg_times(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_UP_AVG_TIMES || input < MIN_CPU_UP_AVG_TIMES)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_up_avg_times = input;
+	hp_reset_strategy_nolock();
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_down_avg_times(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_DOWN_AVG_TIMES || input < MIN_CPU_DOWN_AVG_TIMES)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_down_avg_times = input;
+	hp_reset_strategy_nolock();
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_num_limit(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > num_possible_cpus()
+	    || input < 1)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_num_limit = input;
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_num_base(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	unsigned int online_cpus_count;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > num_possible_cpus()
+	    || input < 1)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+
+	hp_tuners->cpu_num_base = input;
+	online_cpus_count = num_online_cpus();
+#ifdef CONFIG_HOTPLUG_CPU
+
+	if (online_cpus_count < input && online_cpus_count < hp_tuners->cpu_num_limit) {
+		struct cpufreq_policy *policy = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy;	/* TODO: FIXME, cpu = 0 */
+
+		dbs_freq_increase(policy, policy->max);
+		g_trigger_hp_work = CPU_HOTPLUG_WORK_TYPE_BASE;
+		/* schedule_delayed_work_on(0, &hp_work, 0); */
+		if (hp_wq == NULL)
+			pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+		else
+			queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+	}
+#endif
+
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_is_cpu_hotplug_disable(struct dbs_data *dbs_data, const char *buf,
+					    size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > 1 || input < 0)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+
+	if (hp_tuners->is_cpu_hotplug_disable && !input)
+		hp_reset_strategy_nolock();
+
+	hp_tuners->is_cpu_hotplug_disable = input;
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_input_boost_enable(struct dbs_data *dbs_data, const char *buf,
+					    size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > 1 || input < 0)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_input_boost_enable = input;
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_input_boost_num(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > num_possible_cpus()
+	    || input < 2)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_input_boost_num = input;
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_rush_boost_enable(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > 1 || input < 0)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_rush_boost_enable = input;
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_rush_boost_num(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > num_possible_cpus()
+	    || input < 2)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_rush_boost_num = input;
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_rush_threshold(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_RUSH_THRESHOLD || input < MIN_CPU_RUSH_THRESHOLD)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_rush_threshold = input;
+	/* hp_reset_strategy_nolock(); //no need */
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_rush_tlp_times(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_RUSH_TLP_TIMES || input < MIN_CPU_RUSH_TLP_TIMES)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_rush_tlp_times = input;
+	hp_reset_strategy_nolock();
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+static ssize_t store_cpu_rush_avg_times(struct dbs_data *dbs_data, const char *buf, size_t count)
+{
+	struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1 || input > MAX_CPU_RUSH_AVG_TIMES || input < MIN_CPU_RUSH_AVG_TIMES)
+		return -EINVAL;
+
+	mutex_lock(&hp_mutex);
+	hp_tuners->cpu_rush_avg_times = input;
+	hp_reset_strategy_nolock();
+	mutex_unlock(&hp_mutex);
+
+	return count;
+}
+
+show_store_one(hp, down_differential);
+show_store_one(hp, cpu_up_threshold);
+show_store_one(hp, cpu_down_differential);
+show_store_one(hp, cpu_up_avg_times);
+show_store_one(hp, cpu_down_avg_times);
+show_store_one(hp, cpu_num_limit);
+show_store_one(hp, cpu_num_base);
+show_store_one(hp, is_cpu_hotplug_disable);
+show_store_one(hp, cpu_input_boost_enable);
+show_store_one(hp, cpu_input_boost_num);
+show_store_one(hp, cpu_rush_boost_enable);
+show_store_one(hp, cpu_rush_boost_num);
+show_store_one(hp, cpu_rush_threshold);
+show_store_one(hp, cpu_rush_tlp_times);
+show_store_one(hp, cpu_rush_avg_times);
+
+gov_sys_pol_attr_rw(down_differential);
+gov_sys_pol_attr_rw(cpu_up_threshold);
+gov_sys_pol_attr_rw(cpu_down_differential);
+gov_sys_pol_attr_rw(cpu_up_avg_times);
+gov_sys_pol_attr_rw(cpu_down_avg_times);
+gov_sys_pol_attr_rw(cpu_num_limit);
+gov_sys_pol_attr_rw(cpu_num_base);
+gov_sys_pol_attr_rw(is_cpu_hotplug_disable);
+gov_sys_pol_attr_rw(cpu_input_boost_enable);
+gov_sys_pol_attr_rw(cpu_input_boost_num);
+gov_sys_pol_attr_rw(cpu_rush_boost_enable);
+gov_sys_pol_attr_rw(cpu_rush_boost_num);
+gov_sys_pol_attr_rw(cpu_rush_threshold);
+gov_sys_pol_attr_rw(cpu_rush_tlp_times);
+gov_sys_pol_attr_rw(cpu_rush_avg_times);
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+
+static struct attribute *dbs_attributes_gov_sys[] = {
+	&sampling_rate_min_gov_sys.attr,
+	&sampling_rate_gov_sys.attr,
+	&up_threshold_gov_sys.attr,
+	&sampling_down_factor_gov_sys.attr,
+	&ignore_nice_load_gov_sys.attr,
+	&powersave_bias_gov_sys.attr,
+	&io_is_busy_gov_sys.attr,
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+	&down_differential_gov_sys.attr,
+	&cpu_up_threshold_gov_sys.attr,
+	&cpu_down_differential_gov_sys.attr,
+	&cpu_up_avg_times_gov_sys.attr,
+	&cpu_down_avg_times_gov_sys.attr,
+	&cpu_num_limit_gov_sys.attr,
+	&cpu_num_base_gov_sys.attr,
+	&is_cpu_hotplug_disable_gov_sys.attr,
+	&cpu_input_boost_enable_gov_sys.attr,
+	&cpu_input_boost_num_gov_sys.attr,
+	&cpu_rush_boost_enable_gov_sys.attr,
+	&cpu_rush_boost_num_gov_sys.attr,
+	&cpu_rush_threshold_gov_sys.attr,
+	&cpu_rush_tlp_times_gov_sys.attr,
+	&cpu_rush_avg_times_gov_sys.attr,
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+	NULL
+};
+
+static struct attribute_group hp_attr_group_gov_sys = {
+	.attrs = dbs_attributes_gov_sys,
+	.name = "hotplug",
+};
+
+static struct attribute *dbs_attributes_gov_pol[] = {
+	&sampling_rate_min_gov_pol.attr,
+	&sampling_rate_gov_pol.attr,
+	&up_threshold_gov_pol.attr,
+	&sampling_down_factor_gov_pol.attr,
+	&ignore_nice_load_gov_pol.attr,
+	&powersave_bias_gov_pol.attr,
+	&io_is_busy_gov_pol.attr,
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+	&down_differential_gov_pol.attr,
+	&cpu_up_threshold_gov_pol.attr,
+	&cpu_down_differential_gov_pol.attr,
+	&cpu_up_avg_times_gov_pol.attr,
+	&cpu_down_avg_times_gov_pol.attr,
+	&cpu_num_limit_gov_pol.attr,
+	&cpu_num_base_gov_pol.attr,
+	&is_cpu_hotplug_disable_gov_pol.attr,
+	&cpu_input_boost_enable_gov_pol.attr,
+	&cpu_input_boost_num_gov_pol.attr,
+	&cpu_rush_boost_enable_gov_pol.attr,
+	&cpu_rush_boost_num_gov_pol.attr,
+	&cpu_rush_threshold_gov_pol.attr,
+	&cpu_rush_tlp_times_gov_pol.attr,
+	&cpu_rush_avg_times_gov_pol.attr,
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+	NULL
+};
+
+static struct attribute_group hp_attr_group_gov_pol = {
+	.attrs = dbs_attributes_gov_pol,
+	.name = "hotplug",
+};
+
+/************************** sysfs end ************************/
+
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+static struct task_struct *freq_up_task;
+
+static int touch_freq_up_task(void *data)
+{
+	struct cpufreq_policy *policy;
+
+	while (1) {
+		policy = cpufreq_cpu_get(0);
+		dbs_freq_increase(policy, policy->max);
+		cpufreq_cpu_put(policy);
+		/* mt_cpufreq_set_ramp_down_count_const(0, 100); */
+		pr_debug("@%s():%d\n", __func__, __LINE__);
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule();
+
+		if (kthread_should_stop())
+			break;
+	}
+
+	return 0;
+}
+
+static void dbs_input_event(struct input_handle *handle, unsigned int type,
+			    unsigned int code, int value)
+{
+	/* int i; */
+
+	/* if ((dbs_tuners_ins.powersave_bias == POWERSAVE_BIAS_MAXLEVEL) || */
+	/* (dbs_tuners_ins.powersave_bias == POWERSAVE_BIAS_MINLEVEL)) { */
+	/* nothing to do */
+	/* return; */
+	/* } */
+
+	/* for_each_online_cpu(i) { */
+	/* queue_work_on(i, input_wq, &per_cpu(dbs_refresh_work, i)); */
+	/* } */
+	/* pr_debug("$$$ in_interrupt(): %d, in_irq(): %d, type: %d, code: %d, value: %d $$$\n", in_interrupt(), in_irq(), type, code, value); */
+
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+	struct hp_dbs_tuners *hp_tuners;
+
+	if (!dbs_data)
+		return;
+	hp_tuners = dbs_data->tuners;
+	if (!hp_tuners)
+		return;
+
+	if ((type == EV_KEY) && (code == BTN_TOUCH) && (value == 1)
+	    && (dbs_data->cdata->governor == GOV_HOTPLUG && hp_tuners->cpu_input_boost_enable)) {
+		/* if (!in_interrupt()) */
+		/* { */
+		unsigned int online_cpus_count = num_online_cpus();
+
+		pr_debug("@%s():%d, online_cpus_count = %d, cpu_input_boost_num = %d\n", __func__, __LINE__, online_cpus_count, hp_tuners->cpu_input_boost_num);
+
+		if (online_cpus_count < hp_tuners->cpu_input_boost_num && online_cpus_count < hp_tuners->cpu_num_limit) {
+			/* schedule_delayed_work_on(0, &hp_work, 0); */
+			if (hp_wq == NULL)
+				pr_emerg("[power/hotplug] %s():%d, impossible\n", __func__, __LINE__);
+			else
+				queue_delayed_work_on(0, hp_wq, &hp_work, 0);
+		}
+
+		if (online_cpus_count <= hp_tuners->cpu_input_boost_num && online_cpus_count <= hp_tuners->cpu_num_limit)
+			wake_up_process(freq_up_task);
+
+		/* } */
+	}
+}
+
+static int dbs_input_connect(struct input_handler *handler,
+			     struct input_dev *dev, const struct input_device_id *id)
+{
+	struct input_handle *handle;
+	int error;
+
+	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+
+	if (!handle)
+		return -ENOMEM;
+
+	handle->dev = dev;
+	handle->handler = handler;
+	handle->name = "cpufreq";
+
+	error = input_register_handle(handle);
+
+	if (error)
+		goto err2;
+
+	error = input_open_device(handle);
+
+	if (error)
+		goto err1;
+
+	return 0;
+ err1:
+	input_unregister_handle(handle);
+ err2:
+	kfree(handle);
+	return error;
+}
+
+static void dbs_input_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static const struct input_device_id dbs_ids[] = {
+	{.driver_info = 1},
+	{},
+};
+
+static struct input_handler dbs_input_handler = {
+	.event = dbs_input_event,
+	.connect = dbs_input_connect,
+	.disconnect = dbs_input_disconnect,
+	.name = "cpufreq_ond",
+	.id_table = dbs_ids,
+};
+#endif				/* #ifdef CONFIG_HOTPLUG_CPU */
+
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+
+static int hp_init(struct dbs_data *dbs_data)
+{
+	struct hp_dbs_tuners *tuners;
+	u64 idle_time;
+	int cpu;
+
+	tuners = kzalloc(sizeof(struct hp_dbs_tuners), GFP_KERNEL);
+	if (!tuners) {
+		pr_err("%s: kzalloc failed\n", __func__);
+		return -ENOMEM;
+	}
+
+	cpu = get_cpu();
+	idle_time = get_cpu_idle_time_us(cpu, NULL);
+	put_cpu();
+	if (idle_time != -1ULL) {
+		/* Idle micro accounting is supported. Use finer thresholds */
+		tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
+		tuners->adj_up_threshold = MICRO_FREQUENCY_UP_THRESHOLD -
+		    MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
+		tuners->down_differential = MICRO_FREQUENCY_DOWN_DIFFERENTIAL;	/* <-XXX */
+		tuners->cpu_up_threshold = MICRO_CPU_UP_THRESHOLD;	/* <-XXX */
+		tuners->cpu_down_differential = MICRO_CPU_DOWN_DIFFERENTIAL;	/* <-XXX */
+		/*
+		 * In nohz/micro accounting case we set the minimum frequency
+		 * not depending on HZ, but fixed (very low). The deferred
+		 * timer might skip some samples if idle/sleeping as needed.
+		 */
+		dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
+
+		/* cpu rush boost */
+		tuners->cpu_rush_threshold = MICRO_CPU_RUSH_THRESHOLD;	/* <-XXX */
+	} else {
+		tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
+		tuners->adj_up_threshold = DEF_FREQUENCY_UP_THRESHOLD -
+		    DEF_FREQUENCY_DOWN_DIFFERENTIAL;
+		tuners->down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL;	/* <-XXX */
+		tuners->cpu_up_threshold = DEF_CPU_UP_THRESHOLD;	/* <-XXX */
+		tuners->cpu_down_differential = DEF_CPU_DOWN_DIFFERENTIAL;	/* <-XXX */
+
+		/* For correct statistics, we need 10 ticks for each measure */
+		dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10);
+
+		/* cpu rush boost */
+		tuners->cpu_rush_threshold = DEF_CPU_RUSH_THRESHOLD;	/* <-XXX */
+	}
+
+	tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
+	tuners->ignore_nice_load = 0;
+	tuners->powersave_bias = default_powersave_bias;
+	tuners->io_is_busy = should_io_be_busy();
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+	tuners->cpu_up_avg_times = DEF_CPU_UP_AVG_TIMES;
+	tuners->cpu_down_avg_times = DEF_CPU_DOWN_AVG_TIMES;
+	tuners->cpu_num_limit = num_possible_cpus();
+	tuners->cpu_num_base = 1;
+	tuners->is_cpu_hotplug_disable = (tuners->cpu_num_limit > 1) ? 0 : 1;
+	tuners->cpu_input_boost_enable = DEF_CPU_INPUT_BOOST_ENABLE;
+	tuners->cpu_input_boost_num = DEF_CPU_INPUT_BOOST_NUM;
+	tuners->cpu_rush_boost_enable = DEF_CPU_RUSH_BOOST_ENABLE;
+	tuners->cpu_rush_boost_num = num_possible_cpus();
+	tuners->cpu_rush_tlp_times = DEF_CPU_RUSH_TLP_TIMES;
+	tuners->cpu_rush_avg_times = DEF_CPU_RUSH_AVG_TIMES;
+
+#ifdef CONFIG_HOTPLUG_CPU
+	INIT_DEFERRABLE_WORK(&hp_work, hp_work_handler);
+	hp_wq = alloc_workqueue("hp_work_handler", WQ_HIGHPRI, 0);
+	g_next_hp_action = num_online_cpus();
+#endif
+
+#ifdef DEBUG_LOG
+	pr_debug("cpufreq_gov_dbs_init: min_sampling_rate = %d\n", dbs_data->min_sampling_rate);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.up_threshold = %d\n", tuners->up_threshold);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.down_differential = %d\n",
+		 tuners->down_differential);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_threshold = %d\n",
+		 tuners->cpu_up_threshold);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_differential = %d\n",
+		 tuners->cpu_down_differential);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_avg_times = %d\n",
+		 tuners->cpu_up_avg_times);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_avg_times = %d\n",
+		 tuners->cpu_down_avg_times);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_limit = %d\n",
+		 tuners->cpu_num_limit);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_base = %d\n", tuners->cpu_num_base);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.is_cpu_hotplug_disable = %d\n",
+		 tuners->is_cpu_hotplug_disable);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_input_boost_enable = %d\n",
+		 tuners->cpu_input_boost_enable);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_input_boost_num = %d\n",
+		 tuners->cpu_input_boost_num);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_rush_boost_enable = %d\n",
+		 tuners->cpu_rush_boost_enable);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_rush_boost_num = %d\n",
+		 tuners->cpu_rush_boost_num);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_rush_threshold = %d\n",
+		 tuners->cpu_rush_threshold);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_rush_tlp_times = %d\n",
+		 tuners->cpu_rush_tlp_times);
+	pr_debug("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_rush_avg_times = %d\n",
+		 tuners->cpu_rush_avg_times);
+#endif
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+
+	dbs_data->tuners = tuners;
+	mutex_init(&dbs_data->mutex);
+	return 0;
+}
+
+static void hp_exit(struct dbs_data *dbs_data)
+{
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+#ifdef CONFIG_HOTPLUG_CPU
+	cancel_delayed_work_sync(&hp_work);
+	if (hp_wq)
+		destroy_workqueue(hp_wq);
+#endif
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+	kfree(dbs_data->tuners);
+}
+
+define_get_cpu_dbs_routines(hp_cpu_dbs_info);
+
+static struct hp_ops hp_ops = {
+	.powersave_bias_init_cpu = hotplug_powersave_bias_init_cpu,
+	.powersave_bias_target = generic_powersave_bias_target,
+	.freq_increase = dbs_freq_increase,
+	.input_handler = &dbs_input_handler,
+};
+
+static struct common_dbs_data hp_dbs_cdata = {
+	.governor = GOV_HOTPLUG,
+	.attr_group_gov_sys = &hp_attr_group_gov_sys,
+	.attr_group_gov_pol = &hp_attr_group_gov_pol,
+	.get_cpu_cdbs = get_cpu_cdbs,
+	.get_cpu_dbs_info_s = get_cpu_dbs_info_s,
+	.gov_dbs_timer = hp_dbs_timer,
+	.gov_check_cpu = hp_check_cpu,
+	.gov_ops = &hp_ops,
+	.init = hp_init,
+	.exit = hp_exit,
+};
+
+static void hp_set_powersave_bias(unsigned int powersave_bias)
+{
+	struct cpufreq_policy *policy;
+	struct dbs_data *dbs_data;
+	struct hp_dbs_tuners *hp_tuners;
+	unsigned int cpu;
+	cpumask_t done;
+
+	default_powersave_bias = powersave_bias;
+	cpumask_clear(&done);
+
+	get_online_cpus();
+	for_each_online_cpu(cpu) {
+		if (cpumask_test_cpu(cpu, &done))
+			continue;
+
+		policy = per_cpu(hp_cpu_dbs_info, cpu).cdbs.cur_policy;
+		if (!policy)
+			continue;
+
+		cpumask_or(&done, &done, policy->cpus);
+
+		if (policy->governor != &cpufreq_gov_hotplug)
+			continue;
+
+		dbs_data = policy->governor_data;
+		hp_tuners = dbs_data->tuners;
+		hp_tuners->powersave_bias = default_powersave_bias;
+	}
+	put_online_cpus();
+}
+
+void hp_register_powersave_bias_handler(unsigned int (*f)
+					 (struct cpufreq_policy *, unsigned int, unsigned int),
+					unsigned int powersave_bias)
+{
+	hp_ops.powersave_bias_target = f;
+	hp_set_powersave_bias(powersave_bias);
+}
+EXPORT_SYMBOL_GPL(hp_register_powersave_bias_handler);
+
+void hp_unregister_powersave_bias_handler(void)
+{
+	hp_ops.powersave_bias_target = generic_powersave_bias_target;
+	hp_set_powersave_bias(0);
+}
+EXPORT_SYMBOL_GPL(hp_unregister_powersave_bias_handler);
+
+static int hp_cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event)
+{
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+	struct dbs_data *dbs_data;
+	int rc = 0;
+
+	if (have_governor_per_policy())
+		dbs_data = policy->governor_data;
+	else
+		dbs_data = hp_dbs_cdata.gdbs_data;
+
+	/* pr_emerg("***** policy->cpu: %d, event: %u, smp_processor_id: %d, have_governor_per_policy: %d *****\n", policy->cpu, event, smp_processor_id(), have_governor_per_policy()); */
+	switch (event) {
+	case CPUFREQ_GOV_START:
+#ifdef DEBUG_LOG
+		{
+			struct hp_dbs_tuners *hp_tuners = dbs_data->tuners;
+
+			BUG_ON(NULL == dbs_data);
+			BUG_ON(NULL == dbs_data->tuners);
+
+			pr_debug("cpufreq_governor_dbs: min_sampling_rate = %d\n",
+				 dbs_data->min_sampling_rate);
+			pr_debug("cpufreq_governor_dbs: dbs_tuners_ins.sampling_rate = %d\n",
+				 hp_tuners->sampling_rate);
+			pr_debug("cpufreq_governor_dbs: dbs_tuners_ins.io_is_busy = %d\n",
+				 hp_tuners->io_is_busy);
+		}
+#endif
+#ifdef CONFIG_HOTPLUG_CPU
+		if (0)		/* (!policy->cpu) // <-XXX */
+			rc = input_register_handler(&dbs_input_handler);
+#endif
+		break;
+
+	case CPUFREQ_GOV_STOP:
+#ifdef CONFIG_HOTPLUG_CPU
+		if (0)		/* (!policy->cpu) // <-XXX */
+			input_unregister_handler(&dbs_input_handler);
+
+#endif
+		break;
+	}
+
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+	return cpufreq_governor_dbs(policy, &hp_dbs_cdata, event);
+}
+
+/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< */
+#if 0
+int cpufreq_gov_dbs_get_sum_load(void)
+{
+	return g_cpus_sum_load_current;
+}
+#endif
+/* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> */
+
+#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_HOTPLUG
+static
+#endif
+struct cpufreq_governor cpufreq_gov_hotplug = {
+	.name = "hotplug",
+	.governor = hp_cpufreq_governor_dbs,
+	.max_transition_latency = TRANSITION_LATENCY_LIMIT,
+	.owner = THIS_MODULE,
+};
+
+#ifdef CONFIG_MTK_SDIOAUTOK_SUPPORT
+void cpufreq_min_sampling_rate_change(unsigned int sample_rate)
+{
+	struct dbs_data *dbs_data = per_cpu(hp_cpu_dbs_info, 0).cdbs.cur_policy->governor_data;	/* TODO: FIXME, cpu = 0 */
+
+	if (!dbs_data)
+		return;
+
+	dbs_data->min_sampling_rate = sample_rate;
+	update_sampling_rate(dbs_data, sample_rate);
+}
+EXPORT_SYMBOL(cpufreq_min_sampling_rate_change);
+#endif
+
+static int __init cpufreq_gov_dbs_init(void)
+{
+	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+
+	freq_up_task = kthread_create(touch_freq_up_task, NULL, "touch_freq_up_task");
+
+	if (IS_ERR(freq_up_task))
+		return PTR_ERR(freq_up_task);
+
+	sched_setscheduler_nocheck(freq_up_task, SCHED_FIFO, &param);
+	get_task_struct(freq_up_task);
+
+	return cpufreq_register_governor(&cpufreq_gov_hotplug);
+}
+
+static void __exit cpufreq_gov_dbs_exit(void)
+{
+	cpufreq_unregister_governor(&cpufreq_gov_hotplug);
+
+	kthread_stop(freq_up_task);
+	put_task_struct(freq_up_task);
+}
+
+MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
+MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
+MODULE_DESCRIPTION("'cpufreq_hotplug' - A dynamic cpufreq governor for "
+		   "Low Latency Frequency Transition capable processors");
+MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_HOTPLUG
+fs_initcall(cpufreq_gov_dbs_init);
+#else
+module_init(cpufreq_gov_dbs_init);
+#endif
+module_exit(cpufreq_gov_dbs_exit);