| /* |
| * 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. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/cpufreq.h> |
| #include <linux/cpu.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/mutex.h> |
| #include <linux/hrtimer.h> |
| #include <linux/tick.h> |
| #include <linux/ktime.h> |
| #include <linux/sched.h> |
| #include <linux/input.h> |
| #include <linux/slab.h> |
| #include <linux/sched.h> |
| #include <linux/kthread.h> |
| |
| extern unsigned int get_normal_max_freq(void); |
| extern unsigned int mt_dvfs_power_dispatch_safe(void); |
| extern int mt_gpufreq_target(int idx); |
| /* |
| * dbs is used in this file as a shortform for demandbased switching |
| * It helps to keep variable names smaller, simpler |
| */ |
| |
| #define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) |
| #define DEF_FREQUENCY_OD_THRESHOLD (98) |
| #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) |
| #define MAX_FREQUENCY_DOWN_DIFFERENTIAL (20) |
| #define MICRO_FREQUENCY_UP_THRESHOLD (85) |
| #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (30000) |
| #define MIN_FREQUENCY_UP_THRESHOLD (21) |
| #define MAX_FREQUENCY_UP_THRESHOLD (100) |
| |
| #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 (80) |
| #define MAX_CPU_UP_THRESHOLD (100) |
| |
| #define CPU_UP_AVG_TIMES (10) |
| #define CPU_DOWN_AVG_TIMES (50) |
| #define THERMAL_DISPATCH_AVG_TIMES (30) |
| |
| #define DEF_CPU_PERSIST_COUNT (10) |
| |
| //#define DEBUG_LOG |
| #define INPUT_BOOST (1) |
| |
| /* |
| * The polling frequency of this governor depends on the capability of |
| * the processor. Default polling frequency is 1000 times the transition |
| * latency of the processor. The governor will work on any processor with |
| * transition latency <= 10mS, using appropriate sampling |
| * rate. |
| * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL) |
| * this governor will not work. |
| * All times here are in uS. |
| */ |
| #define MIN_SAMPLING_RATE_RATIO (2) |
| |
| static unsigned int min_sampling_rate; |
| |
| #define LATENCY_MULTIPLIER (1000) |
| #define MIN_LATENCY_MULTIPLIER (100) |
| #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) |
| |
| static void do_dbs_timer(struct work_struct *work); |
| static int cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| unsigned int event); |
| |
| #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_BALANCE |
| static |
| #endif |
| struct cpufreq_governor cpufreq_gov_balance = { |
| .name = "hotplug", |
| .governor = cpufreq_governor_dbs, |
| .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
| .owner = THIS_MODULE, |
| }; |
| |
| #ifdef CONFIG_SMP |
| |
| static int g_next_hp_action = 0; |
| |
| static long g_cpu_up_sum_load = 0; |
| static int g_cpu_up_count = 0; |
| |
| static long g_cpu_down_sum_load = 0; |
| static int g_cpu_down_count = 0; |
| static int g_max_cpu_persist_count = 0; |
| static int g_thermal_count = 0; |
| |
| static void hp_work_handler(struct work_struct *work); |
| static struct delayed_work hp_work; |
| |
| #if INPUT_BOOST |
| static struct task_struct *freq_up_task; |
| #endif |
| |
| #endif |
| |
| static int cpu_loading = 0; |
| static int cpus_sum_load = 0; |
| /* Sampling types */ |
| enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE}; |
| |
| struct cpu_dbs_info_s { |
| cputime64_t prev_cpu_idle; |
| cputime64_t prev_cpu_iowait; |
| cputime64_t prev_cpu_wall; |
| cputime64_t prev_cpu_nice; |
| struct cpufreq_policy *cur_policy; |
| struct delayed_work work; |
| struct cpufreq_frequency_table *freq_table; |
| unsigned int freq_lo; |
| unsigned int freq_lo_jiffies; |
| unsigned int freq_hi_jiffies; |
| unsigned int rate_mult; |
| int cpu; |
| unsigned int sample_type:1; |
| /* |
| * percpu mutex that serializes governor limit change with |
| * do_dbs_timer invocation. We do not want do_dbs_timer to run |
| * when user is changing the governor or limits. |
| */ |
| struct mutex timer_mutex; |
| }; |
| static DEFINE_PER_CPU(struct cpu_dbs_info_s, hp_cpu_dbs_info); |
| |
| static unsigned int dbs_enable; /* number of CPUs using this policy */ |
| static unsigned int dbs_ignore = 1; |
| |
| /* |
| * dbs_mutex protects dbs_enable in governor start/stop. |
| */ |
| static DEFINE_MUTEX(dbs_mutex); |
| |
| /* |
| * dbs_hotplug protects all hotplug related global variables |
| */ |
| static DEFINE_MUTEX(hp_mutex); |
| |
| DEFINE_MUTEX(bl_onoff_mutex); |
| |
| static struct dbs_tuners { |
| unsigned int sampling_rate; |
| unsigned int od_threshold; |
| unsigned int up_threshold; |
| unsigned int down_differential; |
| unsigned int ignore_nice; |
| unsigned int sampling_down_factor; |
| unsigned int powersave_bias; |
| unsigned int io_is_busy; |
| unsigned int cpu_up_threshold; |
| unsigned int cpu_down_differential; |
| unsigned int cpu_up_avg_times; |
| unsigned int cpu_down_avg_times; |
| unsigned int thermal_dispatch_avg_times; |
| unsigned int cpu_num_limit; |
| unsigned int cpu_num_base; |
| unsigned int is_cpu_hotplug_disable; |
| #if INPUT_BOOST |
| unsigned int cpu_input_boost_enable; |
| #endif |
| } dbs_tuners_ins = { |
| .od_threshold = DEF_FREQUENCY_OD_THRESHOLD, |
| .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, |
| .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR, |
| .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL, |
| .ignore_nice = 0, |
| .powersave_bias = 0, |
| .cpu_up_threshold = DEF_CPU_UP_THRESHOLD, |
| .cpu_down_differential = DEF_CPU_DOWN_DIFFERENTIAL, |
| .cpu_up_avg_times = CPU_UP_AVG_TIMES, |
| .cpu_down_avg_times = CPU_DOWN_AVG_TIMES, |
| .thermal_dispatch_avg_times = THERMAL_DISPATCH_AVG_TIMES, |
| .cpu_num_limit = 1, |
| .cpu_num_base = 1, |
| .is_cpu_hotplug_disable = 1, |
| #if INPUT_BOOST |
| .cpu_input_boost_enable = 1, |
| #endif |
| }; |
| |
| static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq); |
| |
| static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) |
| { |
| u64 idle_time; |
| u64 cur_wall_time; |
| u64 busy_time; |
| |
| cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); |
| |
| busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER]; |
| busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM]; |
| busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ]; |
| busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; |
| busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; |
| busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; |
| |
| idle_time = cur_wall_time - busy_time; |
| if (wall) |
| *wall = jiffies_to_usecs(cur_wall_time); |
| |
| return jiffies_to_usecs(idle_time); |
| } |
| |
| static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) |
| { |
| u64 idle_time = get_cpu_idle_time_us(cpu, NULL); |
| |
| if (idle_time == -1ULL) |
| return get_cpu_idle_time_jiffy(cpu, wall); |
| else |
| idle_time += get_cpu_iowait_time_us(cpu, wall); |
| |
| return idle_time; |
| } |
| |
| static inline cputime64_t get_cpu_iowait_time(unsigned int cpu, cputime64_t *wall) |
| { |
| u64 iowait_time = get_cpu_iowait_time_us(cpu, wall); |
| |
| if (iowait_time == -1ULL) |
| return 0; |
| |
| return iowait_time; |
| } |
| |
| void force_two_core() |
| { |
| unsigned int input; |
| bool raise_freq = false; |
| int ret; |
| |
| mutex_lock(&hp_mutex); |
| g_cpu_down_count = 0; |
| g_cpu_down_sum_load = 0; |
| if (num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { |
| raise_freq = true; |
| g_next_hp_action = 1; |
| schedule_delayed_work_on(0, &hp_work, 0); |
| } |
| mutex_unlock(&hp_mutex); |
| |
| if (raise_freq == true) { |
| wake_up_process(freq_up_task); |
| } |
| |
| mt_gpufreq_target(0); |
| } |
| |
| /* |
| * 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 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 cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info, |
| policy->cpu); |
| |
| 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 * dbs_tuners_ins.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(dbs_tuners_ins.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_cpu(int cpu) |
| { |
| struct 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; |
| } |
| |
| static void hotplug_powersave_bias_init(void) |
| { |
| int i; |
| for_each_online_cpu(i) { |
| hotplug_powersave_bias_init_cpu(i); |
| } |
| } |
| |
| /************************** sysfs interface ************************/ |
| |
| static ssize_t show_sampling_rate_min(struct kobject *kobj, |
| struct attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%u\n", min_sampling_rate); |
| } |
| |
| define_one_global_ro(sampling_rate_min); |
| |
| /* cpufreq_hotplug Governor Tunables */ |
| #define show_one(file_name, object) \ |
| static ssize_t show_##file_name \ |
| (struct kobject *kobj, struct attribute *attr, char *buf) \ |
| { \ |
| return sprintf(buf, "%u\n", dbs_tuners_ins.object); \ |
| } |
| |
| show_one(sampling_rate, sampling_rate); |
| show_one(io_is_busy, io_is_busy); |
| show_one(up_threshold, up_threshold); |
| show_one(od_threshold, od_threshold); |
| show_one(down_differential, down_differential); |
| show_one(sampling_down_factor, sampling_down_factor); |
| show_one(ignore_nice_load, ignore_nice); |
| show_one(powersave_bias, powersave_bias); |
| show_one(cpu_up_threshold, cpu_up_threshold); |
| show_one(cpu_down_differential, cpu_down_differential); |
| show_one(cpu_up_avg_times, cpu_up_avg_times); |
| show_one(cpu_down_avg_times, cpu_down_avg_times); |
| show_one(thermal_dispatch_avg_times, thermal_dispatch_avg_times); |
| show_one(cpu_num_limit, cpu_num_limit); |
| show_one(cpu_num_base, cpu_num_base); |
| show_one(is_cpu_hotplug_disable, is_cpu_hotplug_disable); |
| #if INPUT_BOOST |
| show_one(cpu_input_boost_enable, cpu_input_boost_enable); |
| #endif |
| |
| /** |
| * update_sampling_rate - update sampling rate effective immediately if needed. |
| * @new_rate: new sampling rate |
| * |
| * If new rate is smaller than the old, simply updaing |
| * 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(unsigned int new_rate) |
| { |
| int cpu; |
| |
| dbs_tuners_ins.sampling_rate = new_rate |
| = max(new_rate, min_sampling_rate); |
| |
| for_each_online_cpu(cpu) { |
| struct cpufreq_policy *policy; |
| struct cpu_dbs_info_s *dbs_info; |
| unsigned long next_sampling, appointed_at; |
| |
| policy = cpufreq_cpu_get(cpu); |
| if (!policy) |
| continue; |
| dbs_info = &per_cpu(hp_cpu_dbs_info, policy->cpu); |
| cpufreq_cpu_put(policy); |
| |
| mutex_lock(&dbs_info->timer_mutex); |
| |
| if (!delayed_work_pending(&dbs_info->work)) { |
| mutex_unlock(&dbs_info->timer_mutex); |
| continue; |
| } |
| |
| next_sampling = jiffies + usecs_to_jiffies(new_rate); |
| appointed_at = dbs_info->work.timer.expires; |
| |
| |
| if (time_before(next_sampling, appointed_at)) { |
| |
| mutex_unlock(&dbs_info->timer_mutex); |
| cancel_delayed_work_sync(&dbs_info->work); |
| mutex_lock(&dbs_info->timer_mutex); |
| |
| schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, |
| usecs_to_jiffies(new_rate)); |
| |
| } |
| mutex_unlock(&dbs_info->timer_mutex); |
| } |
| } |
| |
| static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| if (ret != 1) |
| return -EINVAL; |
| update_sampling_rate(input); |
| return count; |
| } |
| |
| static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| |
| ret = sscanf(buf, "%u", &input); |
| if (ret != 1) |
| return -EINVAL; |
| dbs_tuners_ins.io_is_busy = !!input; |
| return count; |
| } |
| |
| static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| 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; |
| } |
| dbs_tuners_ins.up_threshold = input; |
| return count; |
| } |
| |
| static ssize_t store_od_threshold(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| 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; |
| } |
| dbs_tuners_ins.od_threshold = input; |
| return count; |
| } |
| |
| static ssize_t store_down_differential(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| 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; |
| } |
| dbs_tuners_ins.down_differential = input; |
| return count; |
| } |
| |
| static ssize_t store_sampling_down_factor(struct kobject *a, |
| struct attribute *b, const char *buf, size_t count) |
| { |
| unsigned int input, j; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) |
| return -EINVAL; |
| dbs_tuners_ins.sampling_down_factor = input; |
| |
| /* Reset down sampling multiplier in case it was active */ |
| for_each_online_cpu(j) { |
| struct cpu_dbs_info_s *dbs_info; |
| dbs_info = &per_cpu(hp_cpu_dbs_info, j); |
| dbs_info->rate_mult = 1; |
| } |
| return count; |
| } |
| |
| static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| 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 == dbs_tuners_ins.ignore_nice) { /* nothing to do */ |
| return count; |
| } |
| dbs_tuners_ins.ignore_nice = input; |
| |
| /* we need to re-evaluate prev_cpu_idle */ |
| for_each_online_cpu(j) { |
| struct cpu_dbs_info_s *dbs_info; |
| dbs_info = &per_cpu(hp_cpu_dbs_info, j); |
| dbs_info->prev_cpu_idle = get_cpu_idle_time(j, |
| &dbs_info->prev_cpu_wall); |
| if (dbs_tuners_ins.ignore_nice) |
| dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE]; |
| |
| } |
| return count; |
| } |
| |
| static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| if (ret != 1) |
| return -EINVAL; |
| |
| if (input > 1000) |
| input = 1000; |
| |
| dbs_tuners_ins.powersave_bias = input; |
| hotplug_powersave_bias_init(); |
| return count; |
| } |
| |
| static ssize_t store_cpu_up_threshold(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| 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; |
| } |
| dbs_tuners_ins.cpu_up_threshold = input; |
| return count; |
| } |
| |
| static ssize_t store_cpu_down_differential(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| 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; |
| } |
| dbs_tuners_ins.cpu_down_differential = input; |
| return count; |
| } |
| |
| static ssize_t store_cpu_up_avg_times(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| dbs_tuners_ins.cpu_up_avg_times = input; |
| return count; |
| } |
| |
| static ssize_t store_cpu_down_avg_times(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| dbs_tuners_ins.cpu_down_avg_times = input; |
| return count; |
| } |
| |
| static ssize_t store_thermal_dispatch_avg_times(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| dbs_tuners_ins.thermal_dispatch_avg_times = input; |
| return count; |
| } |
| |
| static ssize_t store_cpu_num_limit(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| dbs_tuners_ins.cpu_num_limit = input; |
| return count; |
| } |
| |
| static ssize_t store_cpu_num_base(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| bool raise_freq = false; |
| int ret; |
| struct cpufreq_policy *policy; |
| |
| policy = cpufreq_cpu_get(0); |
| ret = sscanf(buf, "%u", &input); |
| |
| dbs_tuners_ins.cpu_num_base = input; |
| mutex_lock(&hp_mutex); |
| if (num_online_cpus() < dbs_tuners_ins.cpu_num_base && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { |
| raise_freq = true; |
| g_next_hp_action = 1; |
| schedule_delayed_work_on(0, &hp_work, 0); |
| } |
| mutex_unlock(&hp_mutex); |
| |
| if(raise_freq == true) |
| dbs_freq_increase(policy, policy->max); |
| |
| return count; |
| } |
| |
| static ssize_t store_is_cpu_hotplug_disable(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| dbs_tuners_ins.is_cpu_hotplug_disable = input; |
| return count; |
| } |
| |
| #if INPUT_BOOST |
| static ssize_t store_cpu_input_boost_enable(struct kobject *a, struct attribute *b, |
| const char *buf, size_t count) |
| { |
| unsigned int input; |
| int ret; |
| ret = sscanf(buf, "%u", &input); |
| |
| if (ret != 1 || input > 1 || |
| input < 0) { |
| return -EINVAL; |
| } |
| |
| mutex_lock(&hp_mutex); |
| dbs_tuners_ins.cpu_input_boost_enable = input; |
| mutex_unlock(&hp_mutex); |
| |
| return count; |
| } |
| #endif |
| |
| define_one_global_rw(sampling_rate); |
| define_one_global_rw(io_is_busy); |
| define_one_global_rw(up_threshold); |
| define_one_global_rw(od_threshold); |
| define_one_global_rw(down_differential); |
| define_one_global_rw(sampling_down_factor); |
| define_one_global_rw(ignore_nice_load); |
| define_one_global_rw(powersave_bias); |
| define_one_global_rw(cpu_up_threshold); |
| define_one_global_rw(cpu_down_differential); |
| define_one_global_rw(cpu_up_avg_times); |
| define_one_global_rw(cpu_down_avg_times); |
| define_one_global_rw(thermal_dispatch_avg_times); |
| define_one_global_rw(cpu_num_limit); |
| define_one_global_rw(cpu_num_base); |
| define_one_global_rw(is_cpu_hotplug_disable); |
| #if INPUT_BOOST |
| define_one_global_rw(cpu_input_boost_enable); |
| #endif |
| |
| static struct attribute *dbs_attributes[] = { |
| &sampling_rate_min.attr, |
| &sampling_rate.attr, |
| &up_threshold.attr, |
| &od_threshold.attr, |
| &down_differential.attr, |
| &sampling_down_factor.attr, |
| &ignore_nice_load.attr, |
| &powersave_bias.attr, |
| &io_is_busy.attr, |
| &cpu_up_threshold.attr, |
| &cpu_down_differential.attr, |
| &cpu_up_avg_times.attr, |
| &cpu_down_avg_times.attr, |
| &thermal_dispatch_avg_times.attr, |
| &cpu_num_limit.attr, |
| &cpu_num_base.attr, |
| &is_cpu_hotplug_disable.attr, |
| #if INPUT_BOOST |
| &cpu_input_boost_enable.attr, |
| #endif |
| NULL |
| }; |
| |
| static struct attribute_group dbs_attr_group = { |
| .attrs = dbs_attributes, |
| .name = "hotplug", |
| }; |
| |
| /************************** sysfs end ************************/ |
| |
| static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) |
| { |
| if (dbs_tuners_ins.powersave_bias) |
| freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H); |
| else if (p->cur == p->max) |
| { |
| if (dbs_ignore == 0) |
| dbs_ignore = 1; |
| else |
| return; |
| } |
| |
| __cpufreq_driver_target(p, freq, dbs_tuners_ins.powersave_bias ? |
| CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
| } |
| |
| int mt_cpufreq_cur_load() |
| { |
| return cpu_loading; |
| } |
| EXPORT_SYMBOL(mt_cpufreq_cur_load); |
| |
| void hp_set_dynamic_cpu_hotplug_enable(int enable) |
| { |
| mutex_lock(&hp_mutex); |
| dbs_tuners_ins.is_cpu_hotplug_disable = !enable; |
| mutex_unlock(&hp_mutex); |
| } |
| EXPORT_SYMBOL(hp_set_dynamic_cpu_hotplug_enable); |
| |
| void hp_limited_cpu_num(int num) |
| { |
| mutex_lock(&hp_mutex); |
| dbs_tuners_ins.cpu_num_limit = num; |
| mutex_unlock(&hp_mutex); |
| } |
| EXPORT_SYMBOL(hp_limited_cpu_num); |
| void hp_based_cpu_num(int num) |
| { |
| mutex_lock(&hp_mutex); |
| dbs_tuners_ins.cpu_num_base = num; |
| mutex_unlock(&hp_mutex); |
| } |
| EXPORT_SYMBOL(hp_based_cpu_num); |
| |
| #ifdef CONFIG_SMP |
| |
| static void hp_work_handler(struct work_struct *work) |
| { |
| if (mutex_trylock(&bl_onoff_mutex)) |
| { |
| if (!dbs_tuners_ins.is_cpu_hotplug_disable) |
| { |
| int onlines_cpu_n = num_online_cpus(); |
| |
| if (g_next_hp_action) // turn on CPU |
| { |
| if (onlines_cpu_n < num_possible_cpus()) |
| { |
| printk("hp_work_handler: cpu_up(%d) kick off\n", onlines_cpu_n); |
| cpu_up(onlines_cpu_n); |
| printk("hp_work_handler: cpu_up(%d) completion\n", onlines_cpu_n); |
| |
| dbs_ignore = 0; // force trigger frequency scaling |
| } |
| } |
| else // turn off CPU |
| { |
| if (onlines_cpu_n > 1) |
| { |
| printk("hp_work_handler: cpu_down(%d) kick off\n", (onlines_cpu_n - 1)); |
| cpu_down((onlines_cpu_n - 1)); |
| printk("hp_work_handler: cpu_down(%d) completion\n", (onlines_cpu_n - 1)); |
| |
| dbs_ignore = 0; // force trigger frequency scaling |
| } |
| } |
| } |
| mutex_unlock(&bl_onoff_mutex); |
| } |
| } |
| |
| #endif |
| |
| static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) |
| { |
| unsigned int max_load_freq; |
| bool raise_freq = false; |
| |
| struct cpufreq_policy *policy; |
| unsigned int j; |
| |
| this_dbs_info->freq_lo = 0; |
| policy = this_dbs_info->cur_policy; |
| |
| /* |
| * 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 a 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 |
| */ |
| |
| /* Get Absolute Load - in terms of freq */ |
| max_load_freq = 0; |
| cpus_sum_load = 0; |
| |
| for_each_cpu(j, policy->cpus) { |
| struct cpu_dbs_info_s *j_dbs_info; |
| cputime64_t cur_wall_time, cur_idle_time, cur_iowait_time; |
| unsigned int idle_time, wall_time, iowait_time; |
| unsigned int load, load_freq; |
| int freq_avg; |
| |
| j_dbs_info = &per_cpu(hp_cpu_dbs_info, j); |
| |
| cur_idle_time = get_cpu_idle_time(j, &cur_wall_time); |
| cur_iowait_time = get_cpu_iowait_time(j, &cur_wall_time); |
| |
| wall_time = (unsigned int) |
| (cur_wall_time - j_dbs_info->prev_cpu_wall); |
| j_dbs_info->prev_cpu_wall = cur_wall_time; |
| |
| idle_time = (unsigned int) |
| (cur_idle_time - j_dbs_info->prev_cpu_idle); |
| j_dbs_info->prev_cpu_idle = cur_idle_time; |
| |
| iowait_time = (unsigned int) |
| (cur_iowait_time - j_dbs_info->prev_cpu_iowait); |
| j_dbs_info->prev_cpu_iowait = cur_iowait_time; |
| |
| if (dbs_tuners_ins.ignore_nice) { |
| u64 cur_nice; |
| unsigned long cur_nice_jiffies; |
| |
| cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] - |
| j_dbs_info->prev_cpu_nice; |
| /* |
| * Assumption: nice time between sampling periods will |
| * be less than 2^32 jiffies for 32 bit sys |
| */ |
| cur_nice_jiffies = (unsigned long) |
| cputime64_to_jiffies64(cur_nice); |
| |
| j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE]; |
| idle_time += jiffies_to_usecs(cur_nice_jiffies); |
| } |
| |
| /* |
| * For the purpose of hotplug, waiting for disk IO is an |
| * indication that you're performance critical, and not that |
| * the system is actually idle. So subtract the iowait time |
| * from the cpu idle time. |
| */ |
| |
| if (dbs_tuners_ins.io_is_busy && idle_time >= iowait_time) |
| idle_time -= iowait_time; |
| |
| if (unlikely(!wall_time || wall_time < idle_time)) |
| continue; |
| |
| load = 100 * (wall_time - idle_time) / wall_time; |
| |
| cpus_sum_load += load; |
| |
| freq_avg = __cpufreq_driver_getavg(policy, j); |
| if (freq_avg <= 0) |
| freq_avg = policy->cur; |
| |
| load_freq = load * freq_avg; |
| if (load_freq > max_load_freq) |
| max_load_freq = load_freq; |
| |
| #ifdef DEBUG_LOG |
| printk("dbs_check_cpu: cpu = %d\n", j); |
| printk("dbs_check_cpu: wall_time = %d, idle_time = %d, load = %d\n", wall_time, idle_time, load); |
| printk("dbs_check_cpu: freq_avg = %d, max_load_freq = %d, cpus_sum_load = %d\n", freq_avg, max_load_freq, cpus_sum_load); |
| #endif |
| } |
| // record loading information |
| cpu_loading = max_load_freq / policy->cur; |
| // dispatch power budget |
| if(g_thermal_count >= dbs_tuners_ins.thermal_dispatch_avg_times) { |
| g_thermal_count = 0; |
| mt_dvfs_power_dispatch_safe(); |
| __cpufreq_driver_target(policy, policy->cur, CPUFREQ_RELATION_L); |
| } |
| else |
| g_thermal_count++; |
| |
| if (policy->cur >= get_normal_max_freq()){ |
| if ((max_load_freq > dbs_tuners_ins.od_threshold * policy->cur) && (num_online_cpus() == num_possible_cpus())){ |
| g_max_cpu_persist_count++; |
| #ifdef DEBUG_LOG |
| printk("dvfs_od: g_max_cpu_persist_count: %d\n", g_max_cpu_persist_count); |
| #endif |
| if(g_max_cpu_persist_count == DEF_CPU_PERSIST_COUNT){ |
| //only ramp up to OD OPP here |
| #ifdef DEBUG_LOG |
| printk("dvfs_od: cpu loading = %d\n", max_load_freq/policy->cur); |
| #endif |
| if (policy->cur < policy->max) |
| this_dbs_info->rate_mult = |
| dbs_tuners_ins.sampling_down_factor; |
| dbs_freq_increase(policy, policy->max); |
| #ifdef DEBUG_LOG |
| printk("reset g_max_cpu_persist_count, count = 10\n"); |
| #endif |
| g_max_cpu_persist_count = 0; |
| goto hp_check; |
| } |
| } |
| else { |
| g_max_cpu_persist_count = 0; |
| } |
| } |
| else{ |
| if (max_load_freq > dbs_tuners_ins.up_threshold * policy->cur) { |
| /* If switching to max speed, apply sampling_down_factor */ |
| if (policy->cur < get_normal_max_freq()) |
| this_dbs_info->rate_mult = |
| dbs_tuners_ins.sampling_down_factor; |
| dbs_freq_increase(policy, get_normal_max_freq()); |
| if(g_max_cpu_persist_count != 0){ |
| g_max_cpu_persist_count = 0; |
| #ifdef DEBUG_LOG |
| printk("reset g_max_cpu_persist_count, and fallback to normal max\n"); |
| #endif |
| } |
| goto hp_check; |
| } |
| } |
| |
| /* Check for frequency decrease */ |
| /* if we cannot reduce the frequency anymore, break out early */ |
| if (policy->cur == policy->min) |
| goto hp_check; |
| |
| /* |
| * 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 (max_load_freq < |
| (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) * |
| policy->cur) { |
| unsigned int freq_next; |
| freq_next = max_load_freq / |
| (dbs_tuners_ins.up_threshold - |
| dbs_tuners_ins.down_differential); |
| |
| /* No longer fully busy, reset rate_mult */ |
| this_dbs_info->rate_mult = 1; |
| |
| if (freq_next < policy->min) |
| freq_next = policy->min; |
| |
| if(g_max_cpu_persist_count != 0){ |
| g_max_cpu_persist_count = 0; |
| #ifdef DEBUG_LOG |
| printk("reset g_max_cpu_persist_count, decrease freq accrording to loading\n"); |
| #endif |
| } |
| |
| if (!dbs_tuners_ins.powersave_bias) { |
| __cpufreq_driver_target(policy, freq_next, |
| CPUFREQ_RELATION_L); |
| } else { |
| int freq = powersave_bias_target(policy, freq_next, |
| CPUFREQ_RELATION_L); |
| __cpufreq_driver_target(policy, freq, |
| CPUFREQ_RELATION_L); |
| } |
| } |
| |
| hp_check: |
| |
| /* If Hot Plug policy disable, return directly */ |
| if (dbs_tuners_ins.is_cpu_hotplug_disable) |
| return; |
| |
| #ifdef CONFIG_SMP |
| mutex_lock(&hp_mutex); |
| |
| /* Check CPU loading to power up slave CPU */ |
| if (num_online_cpus() < dbs_tuners_ins.cpu_num_base && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { |
| raise_freq = true; |
| printk("dbs_check_cpu: turn on CPU by perf service\n"); |
| g_next_hp_action = 1; |
| schedule_delayed_work_on(0, &hp_work, 0); |
| } else if (num_online_cpus() < num_possible_cpus() && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { |
| g_cpu_up_count++; |
| g_cpu_up_sum_load += cpus_sum_load; |
| if (g_cpu_up_count == dbs_tuners_ins.cpu_up_avg_times) { |
| g_cpu_up_sum_load /= dbs_tuners_ins.cpu_up_avg_times; |
| if (g_cpu_up_sum_load > |
| (dbs_tuners_ins.cpu_up_threshold * num_online_cpus())) { |
| #ifdef DEBUG_LOG |
| printk("dbs_check_cpu: g_cpu_up_sum_load = %d\n", g_cpu_up_sum_load); |
| #endif |
| raise_freq = true; |
| printk("dbs_check_cpu: turn on CPU\n"); |
| g_next_hp_action = 1; |
| schedule_delayed_work_on(0, &hp_work, 0); |
| } |
| g_cpu_up_count = 0; |
| g_cpu_up_sum_load = 0; |
| } |
| #ifdef DEBUG_LOG |
| printk("dbs_check_cpu: g_cpu_up_count = %d, g_cpu_up_sum_load = %d\n", g_cpu_up_count, g_cpu_up_sum_load); |
| printk("dbs_check_cpu: cpu_up_threshold = %d\n", (dbs_tuners_ins.cpu_up_threshold * num_online_cpus())); |
| #endif |
| } |
| |
| /* Check CPU loading to power down slave CPU */ |
| if (num_online_cpus() > 1) { |
| g_cpu_down_count++; |
| g_cpu_down_sum_load += cpus_sum_load; |
| if (g_cpu_down_count == dbs_tuners_ins.cpu_down_avg_times) { |
| g_cpu_down_sum_load /= dbs_tuners_ins.cpu_down_avg_times; |
| if (g_cpu_down_sum_load < |
| ((dbs_tuners_ins.cpu_up_threshold - dbs_tuners_ins.cpu_down_differential) * (num_online_cpus() - 1))) { |
| if (num_online_cpus() > dbs_tuners_ins.cpu_num_base) { |
| #ifdef DEBUG_LOG |
| printk("dbs_check_cpu: g_cpu_down_sum_load = %d\n", g_cpu_down_sum_load); |
| #endif |
| raise_freq = true; |
| printk("dbs_check_cpu: turn off CPU\n"); |
| g_next_hp_action = 0; |
| schedule_delayed_work_on(0, &hp_work, 0); |
| } |
| } |
| g_cpu_down_count = 0; |
| g_cpu_down_sum_load = 0; |
| } |
| #ifdef DEBUG_LOG |
| printk("dbs_check_cpu: g_cpu_down_count = %d, g_cpu_down_sum_load = %d\n", g_cpu_down_count, g_cpu_down_sum_load); |
| printk("dbs_check_cpu: cpu_down_threshold = %d\n", ((dbs_tuners_ins.cpu_up_threshold - dbs_tuners_ins.cpu_down_differential) * (num_online_cpus() - 1))); |
| #endif |
| } |
| |
| mutex_unlock(&hp_mutex); |
| #endif |
| // need to retrieve dbs_freq_increase out of hp_mutex |
| // in case of self-deadlock |
| if(raise_freq == true) |
| dbs_freq_increase(policy, policy->max); |
| |
| return; |
| } |
| |
| static void do_dbs_timer(struct work_struct *work) |
| { |
| struct cpu_dbs_info_s *dbs_info = |
| container_of(work, struct cpu_dbs_info_s, work.work); |
| unsigned int cpu = dbs_info->cpu; |
| int sample_type = dbs_info->sample_type; |
| |
| int delay; |
| |
| mutex_lock(&dbs_info->timer_mutex); |
| |
| /* Common NORMAL_SAMPLE setup */ |
| dbs_info->sample_type = DBS_NORMAL_SAMPLE; |
| if (!dbs_tuners_ins.powersave_bias || |
| sample_type == DBS_NORMAL_SAMPLE) { |
| dbs_check_cpu(dbs_info); |
| if (dbs_info->freq_lo) { |
| /* Setup timer for SUB_SAMPLE */ |
| dbs_info->sample_type = DBS_SUB_SAMPLE; |
| delay = dbs_info->freq_hi_jiffies; |
| } else { |
| /* We want all CPUs to do sampling nearly on |
| * same jiffy |
| */ |
| delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate |
| * dbs_info->rate_mult); |
| |
| if (num_online_cpus() > 1) |
| delay -= jiffies % delay; |
| } |
| } else { |
| __cpufreq_driver_target(dbs_info->cur_policy, |
| dbs_info->freq_lo, CPUFREQ_RELATION_H); |
| delay = dbs_info->freq_lo_jiffies; |
| } |
| schedule_delayed_work_on(cpu, &dbs_info->work, delay); |
| mutex_unlock(&dbs_info->timer_mutex); |
| } |
| |
| static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info) |
| { |
| /* We want all CPUs to do sampling nearly on same jiffy */ |
| int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); |
| |
| if (num_online_cpus() > 1) |
| delay -= jiffies % delay; |
| |
| dbs_info->sample_type = DBS_NORMAL_SAMPLE; |
| INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer); |
| schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay); |
| } |
| |
| static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info) |
| { |
| cancel_delayed_work_sync(&dbs_info->work); |
| } |
| |
| /* |
| * Not all CPUs want IO time to be accounted as busy; this dependson 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 (androidlcom) calis 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) andl 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 |
| } |
| |
| #if INPUT_BOOST |
| static void dbs_input_event(struct input_handle *handle, unsigned int type, |
| unsigned int code, int value) |
| { |
| if ((type == EV_KEY) && (code == BTN_TOUCH) && (value == 1) && (dbs_tuners_ins.cpu_input_boost_enable)) |
| { |
| force_two_core(); |
| } |
| } |
| |
| 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_balance"; |
| |
| 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[] = { |
| { |
| .flags = INPUT_DEVICE_ID_MATCH_EVBIT | |
| INPUT_DEVICE_ID_MATCH_ABSBIT, |
| .evbit = { BIT_MASK(EV_ABS) }, |
| .absbit = { [BIT_WORD(ABS_MT_POSITION_X)] = |
| BIT_MASK(ABS_MT_POSITION_X) | |
| BIT_MASK(ABS_MT_POSITION_Y) }, |
| }, /* multi-touch touchscreen */ |
| { |
| .flags = INPUT_DEVICE_ID_MATCH_KEYBIT | |
| INPUT_DEVICE_ID_MATCH_ABSBIT, |
| .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, |
| .absbit = { [BIT_WORD(ABS_X)] = |
| BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, |
| }, /* touchpad */ |
| { }, |
| }; |
| |
| static struct input_handler dbs_input_handler = { |
| .event = dbs_input_event, |
| .connect = dbs_input_connect, |
| .disconnect = dbs_input_disconnect, |
| .name = "cpufreq_balance", |
| .id_table = dbs_ids, |
| }; |
| #endif //#ifdef CONFIG_HOTPLUG_CPU |
| |
| |
| |
| static int cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| unsigned int event) |
| { |
| unsigned int cpu = policy->cpu; |
| struct cpu_dbs_info_s *this_dbs_info; |
| unsigned int j; |
| int rc; |
| |
| this_dbs_info = &per_cpu(hp_cpu_dbs_info, cpu); |
| |
| switch (event) { |
| case CPUFREQ_GOV_START: |
| if ((!cpu_online(cpu)) || (!policy->cur)) |
| return -EINVAL; |
| |
| mutex_lock(&dbs_mutex); |
| |
| dbs_enable++; |
| for_each_cpu(j, policy->cpus) { |
| struct cpu_dbs_info_s *j_dbs_info; |
| j_dbs_info = &per_cpu(hp_cpu_dbs_info, j); |
| j_dbs_info->cur_policy = policy; |
| |
| j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j, |
| &j_dbs_info->prev_cpu_wall); |
| if (dbs_tuners_ins.ignore_nice) |
| j_dbs_info->prev_cpu_nice = |
| kcpustat_cpu(j).cpustat[CPUTIME_NICE]; |
| } |
| this_dbs_info->cpu = cpu; |
| this_dbs_info->rate_mult = 1; |
| hotplug_powersave_bias_init_cpu(cpu); |
| /* |
| * Start the timerschedule work, when this governor |
| * is used for first time |
| */ |
| if (dbs_enable == 1) { |
| unsigned int latency; |
| |
| rc = sysfs_create_group(cpufreq_global_kobject, |
| &dbs_attr_group); |
| if (rc) { |
| mutex_unlock(&dbs_mutex); |
| return rc; |
| } |
| |
| /* policy latency is in nS. Convert it to uS first */ |
| latency = policy->cpuinfo.transition_latency / 1000; |
| if (latency == 0) |
| latency = 1; |
| /* Bring kernel and HW constraints together */ |
| min_sampling_rate = max(min_sampling_rate, |
| MIN_LATENCY_MULTIPLIER * latency); |
| dbs_tuners_ins.sampling_rate = |
| max(min_sampling_rate, |
| latency * LATENCY_MULTIPLIER); |
| dbs_tuners_ins.io_is_busy = should_io_be_busy(); |
| |
| #ifdef DEBUG_LOG |
| printk("cpufreq_governor_dbs: min_sampling_rate = %d\n", min_sampling_rate); |
| printk("cpufreq_governor_dbs: dbs_tuners_ins.sampling_rate = %d\n", dbs_tuners_ins.sampling_rate); |
| printk("cpufreq_governor_dbs: dbs_tuners_ins.io_is_busy = %d\n", dbs_tuners_ins.io_is_busy); |
| #endif |
| } |
| #if INPUT_BOOST |
| if (!cpu) |
| rc = input_register_handler(&dbs_input_handler); |
| #endif |
| mutex_unlock(&dbs_mutex); |
| |
| mutex_init(&this_dbs_info->timer_mutex); |
| dbs_timer_init(this_dbs_info); |
| break; |
| |
| case CPUFREQ_GOV_STOP: |
| dbs_timer_exit(this_dbs_info); |
| |
| mutex_lock(&dbs_mutex); |
| mutex_destroy(&this_dbs_info->timer_mutex); |
| dbs_enable--; |
| #if INPUT_BOOST |
| if (!cpu) |
| input_unregister_handler(&dbs_input_handler); |
| |
| #endif |
| mutex_unlock(&dbs_mutex); |
| if (!dbs_enable) |
| sysfs_remove_group(cpufreq_global_kobject, |
| &dbs_attr_group); |
| |
| break; |
| |
| case CPUFREQ_GOV_LIMITS: |
| mutex_lock(&this_dbs_info->timer_mutex); |
| if (get_normal_max_freq() < this_dbs_info->cur_policy->cur) |
| __cpufreq_driver_target(this_dbs_info->cur_policy, |
| get_normal_max_freq(), CPUFREQ_RELATION_H); |
| else if (policy->min > this_dbs_info->cur_policy->cur) |
| __cpufreq_driver_target(this_dbs_info->cur_policy, |
| policy->min, CPUFREQ_RELATION_L); |
| mutex_unlock(&this_dbs_info->timer_mutex); |
| break; |
| } |
| return 0; |
| } |
| |
| /*int cpufreq_gov_dbs_get_sum_load(void) |
| { |
| return cpus_sum_load; |
| }*/ |
| |
| #if INPUT_BOOST |
| 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); |
| |
| set_current_state(TASK_INTERRUPTIBLE); |
| schedule(); |
| |
| if (kthread_should_stop()) |
| break; |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| static int __init cpufreq_gov_dbs_init(void) |
| { |
| u64 idle_time; |
| int cpu = get_cpu(); |
| |
| #if INPUT_BOOST |
| struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; |
| #endif |
| |
| idle_time = get_cpu_idle_time_us(cpu, NULL); |
| put_cpu(); |
| if (idle_time != -1ULL) { |
| /* Idle micro accounting is supported. Use finer thresholds */ |
| dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
| dbs_tuners_ins.down_differential = |
| MICRO_FREQUENCY_DOWN_DIFFERENTIAL; |
| dbs_tuners_ins.cpu_up_threshold = |
| MICRO_CPU_UP_THRESHOLD; |
| dbs_tuners_ins.cpu_down_differential = |
| MICRO_CPU_DOWN_DIFFERENTIAL; |
| /* |
| * 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. |
| */ |
| min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; |
| } else { |
| /* For correct statistics, we need 10 ticks for each measure */ |
| min_sampling_rate = |
| MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10); |
| } |
| |
| dbs_tuners_ins.cpu_num_limit = num_possible_cpus(); |
| dbs_tuners_ins.cpu_num_base = 1; |
| |
| if (dbs_tuners_ins.cpu_num_limit > 1) |
| dbs_tuners_ins.is_cpu_hotplug_disable = 0; |
| |
| #ifdef CONFIG_SMP |
| INIT_DELAYED_WORK_DEFERRABLE(&hp_work, hp_work_handler); |
| #endif |
| |
| |
| #if INPUT_BOOST |
| 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, ¶m); |
| get_task_struct(freq_up_task); |
| #endif |
| |
| #ifdef DEBUG_LOG |
| printk("cpufreq_gov_dbs_init: min_sampling_rate = %d\n", min_sampling_rate); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.up_threshold = %d\n", dbs_tuners_ins.up_threshold); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.od_threshold = %d\n", dbs_tuners_ins.od_threshold); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.down_differential = %d\n", dbs_tuners_ins.down_differential); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_threshold = %d\n", dbs_tuners_ins.cpu_up_threshold); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_differential = %d\n", dbs_tuners_ins.cpu_down_differential); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_avg_times = %d\n", dbs_tuners_ins.cpu_up_avg_times); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_avg_times = %d\n", dbs_tuners_ins.cpu_down_avg_times); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.thermal_di_avg_times = %d\n", dbs_tuners_ins.thermal_dispatch_avg_times); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_limit = %d\n", dbs_tuners_ins.cpu_num_limit); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_base = %d\n", dbs_tuners_ins.cpu_num_base); |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.is_cpu_hotplug_disable = %d\n", dbs_tuners_ins.is_cpu_hotplug_disable); |
| #if INPUT_BOOST |
| printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_input_boost_enable = %d\n", dbs_tuners_ins.cpu_input_boost_enable); |
| #endif /* INPUT_BOOST */ |
| #endif /* DEBUG_LOG */ |
| |
| return cpufreq_register_governor(&cpufreq_gov_balance); |
| } |
| |
| static void __exit cpufreq_gov_dbs_exit(void) |
| { |
| #ifdef CONFIG_SMP |
| cancel_delayed_work_sync(&hp_work); |
| #endif |
| |
| cpufreq_unregister_governor(&cpufreq_gov_balance); |
| |
| #if INPUT_BOOST |
| kthread_stop(touch_freq_up_task); |
| put_task_struct(touch_freq_up_task); |
| #endif |
| } |
| |
| |
| MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
| MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); |
| MODULE_DESCRIPTION("'cpufreq_balance' - A dynamic cpufreq governor for " |
| "Low Latency Frequency Transition capable processors"); |
| MODULE_LICENSE("GPL"); |
| |
| #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_BALANCE |
| fs_initcall(cpufreq_gov_dbs_init); |
| #else |
| module_init(cpufreq_gov_dbs_init); |
| #endif |
| module_exit(cpufreq_gov_dbs_exit); |