Texte vergleichen

Finden Sie den Unterschied zwischen zwei Textdateien

Echtzeit-Diff

Einheitlicher Diff

Zeilen einklappen

Änderungen hervorheben

Syntaxhervorhebung

Werkzeuge

Diffchecker Desktop The most secure way to run Diffchecker. Get the Diffchecker Desktop app: your diffs never leave your computer!Get Desktop

Untitled diff

Created 10 years agoDiff never expires

Zeilen
Gesamt
Entfernt

Wörter
Gesamt
Entfernt

Um diese Funktion weiterhin zu nutzen, aktualisieren Sie auf Diffchecker Pro Preise anzeigen

805 Zeilen

Zeilen
Gesamt
Hinzugefügt

Wörter
Gesamt
Hinzugefügt

Um diese Funktion weiterhin zu nutzen, aktualisieren Sie auf Diffchecker Pro Preise anzeigen

* drivers/cpufreq/cpufreq_smartass2.c

* drivers/cpufreq/cpufreq_smartassH3.c

* This software is licensed under the terms of the GNU General Public

* License version 2, as published by the Free Software Foundation, and

* may be copied, distributed, and modified under those terms.

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

* Author: Erasmux

* Based on the interactive governor By Mike Chan (mike@android.com)

* which was adaptated to 2.6.29 kernel by Nadlabak (pavel@doshaska.net)

* SMP support based on mod by faux123

* For a general overview of smartassV2 see the relavent part in

* Documentation/cpu-freq/governors.txt

#include <linux/cpu.h>

#include <linux/cpumask.h>

#include <linux/cpufreq.h>

#include <linux/sched.h>

#include <linux/tick.h>

#include <linux/timer.h>

#include <linux/workqueue.h>

#include <linux/moduleparam.h>

#include <asm/cputime.h>

#include <linux/earlysuspend.h>

/******************** Tunable parameters: ********************/

* The "ideal" frequency to use when awake. The governor will ramp up faster

* towards the ideal frequency and slower after it has passed it. Similarly,

* lowering the frequency towards the ideal frequency is faster than below it.

#define DEFAULT_AWAKE_IDEAL_FREQ 600000

#define DEFAULT_AWAKE_IDEAL_FREQ 320000

static unsigned int awake_ideal_freq;

* The "ideal" frequency to use when suspended.

* When set to 0, the governor will not track the suspended state (meaning

* that practically when sleep_ideal_freq==0 the awake_ideal_freq is used

* also when suspended).

#define DEFAULT_SLEEP_IDEAL_FREQ 128000

#define DEFAULT_SLEEP_IDEAL_FREQ 122880

static unsigned int sleep_ideal_freq;

* Freqeuncy delta when ramping up above the ideal freqeuncy.

* Zero disables and causes to always jump straight to max frequency.

* When below the ideal freqeuncy we always ramp up to the ideal freq.

#define DEFAULT_RAMP_UP_STEP 128000

#define DEFAULT_RAMP_UP_STEP 80000

static unsigned int ramp_up_step;

* Freqeuncy delta when ramping down below the ideal freqeuncy.

* Zero disables and will calculate ramp down according to load heuristic.

* When above the ideal freqeuncy we always ramp down to the ideal freq.

#define DEFAULT_RAMP_DOWN_STEP 256000

#define DEFAULT_RAMP_DOWN_STEP 80000

static unsigned int ramp_down_step;

* CPU freq will be increased if measured load > max_cpu_load;

#define DEFAULT_MAX_CPU_LOAD 50

#define DEFAULT_MAX_CPU_LOAD 85

static unsigned long max_cpu_load;

* CPU freq will be decreased if measured load < min_cpu_load;

#define DEFAULT_MIN_CPU_LOAD 25

#define DEFAULT_MIN_CPU_LOAD 70

static unsigned long min_cpu_load;

* The minimum amount of time to spend at a frequency before we can ramp up.

* Notice we ignore this when we are below the ideal frequency.

#define DEFAULT_UP_RATE_US 48000;

static unsigned long up_rate_us;

* The minimum amount of time to spend at a frequency before we can ramp down.

* Notice we ignore this when we are above the ideal frequency.

#define DEFAULT_DOWN_RATE_US 99000;

#define DEFAULT_DOWN_RATE_US 49000;

static unsigned long down_rate_us;

* The frequency to set when waking up from sleep.

* When sleep_ideal_freq=0 this will have no effect.

#define DEFAULT_SLEEP_WAKEUP_FREQ 99999999

static unsigned int sleep_wakeup_freq;

* Sampling rate, I highly recommend to leave it at 2.

#define DEFAULT_SAMPLE_RATE_JIFFIES 2

static unsigned int sample_rate_jiffies;

/*************** End of tunables ***************/

static void (*pm_idle_old)(void);

static atomic_t active_count = ATOMIC_INIT(0);

struct smartass_info_s {

struct cpufreq_policy *cur_policy;

struct cpufreq_frequency_table *freq_table;

struct timer_list timer;

u64 time_in_idle;

u64 idle_exit_time;

u64 freq_change_time;

u64 freq_change_time_in_idle;

int cur_cpu_load;

int old_freq;

int ramp_dir;

unsigned int enable;

int ideal_speed;

};

static DEFINE_PER_CPU(struct smartass_info_s, smartass_info);

/* Workqueues handle frequency scaling */

static struct workqueue_struct *up_wq;

static struct workqueue_struct *down_wq;

static struct work_struct freq_scale_work;

static cpumask_t work_cpumask;

static spinlock_t cpumask_lock;

static unsigned int suspended;

#define dprintk(flag,msg...) do { \

if (debug_mask & flag) printk(KERN_DEBUG msg); \

} while (0)

enum {

SMARTASS_DEBUG_JUMPS=1,

SMARTASS_DEBUG_LOAD=2,

SMARTASS_DEBUG_ALG=4

};

* Combination of the above debug flags.

static unsigned long debug_mask;

static int cpufreq_governor_smartass(struct cpufreq_policy *policy,

static int cpufreq_governor_smartass_h3(struct cpufreq_policy *policy,

unsigned int event);

#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS2

#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASSH3

static

#endif

struct cpufreq_governor cpufreq_gov_smartass2 = {

struct cpufreq_governor cpufreq_gov_smartass_h3 = {

.name = "smartassV2",

.name = "SmartassH3",

.governor = cpufreq_governor_smartass,

.governor = cpufreq_governor_smartass_h3,

.max_transition_latency = 9000000,

.owner = THIS_MODULE,

};

inline static void smartass_update_min_max(struct smartass_info_s *this_smartass, struct cpufreq_policy *policy, int suspend) {

if (suspend) {

this_smartass->ideal_speed = // sleep_ideal_freq; but make sure it obeys the policy min/max

policy->max > sleep_ideal_freq ?

(sleep_ideal_freq > policy->min ? sleep_ideal_freq : policy->min) : policy->max;

} else {

this_smartass->ideal_speed = // awake_ideal_freq; but make sure it obeys the policy min/max

policy->min < awake_ideal_freq ?

(awake_ideal_freq < policy->max ? awake_ideal_freq : policy->max) : policy->min;

}

inline static void smartass_update_min_max_allcpus(void) {

unsigned int i;

for_each_online_cpu(i) {

struct smartass_info_s *this_smartass = &per_cpu(smartass_info, i);

if (this_smartass->enable)

smartass_update_min_max(this_smartass,this_smartass->cur_policy,suspended);

}

inline static unsigned int validate_freq(struct cpufreq_policy *policy, int freq) {

if (freq > (int)policy->max)

return policy->max;

if (freq < (int)policy->min)

return policy->min;

return freq;

}

inline static void reset_timer(unsigned long cpu, struct smartass_info_s *this_smartass) {

this_smartass->time_in_idle = get_cpu_idle_time_us(cpu, &this_smartass->idle_exit_time);

mod_timer(&this_smartass->timer, jiffies + sample_rate_jiffies);

}

inline static void work_cpumask_set(unsigned long cpu) {

unsigned long flags;

spin_lock_irqsave(&cpumask_lock, flags);

cpumask_set_cpu(cpu, &work_cpumask);

spin_unlock_irqrestore(&cpumask_lock, flags);

}

inline static int work_cpumask_test_and_clear(unsigned long cpu) {

unsigned long flags;

int res = 0;

spin_lock_irqsave(&cpumask_lock, flags);

res = test_and_clear_bit(cpu, work_cpumask.bits);

spin_unlock_irqrestore(&cpumask_lock, flags);

return res;

}

inline static int target_freq(struct cpufreq_policy *policy, struct smartass_info_s *this_smartass,

int new_freq, int old_freq, int prefered_relation) {

int index, target;

struct cpufreq_frequency_table *table = this_smartass->freq_table;

if (new_freq == old_freq)

return 0;

new_freq = validate_freq(policy,new_freq);

if (new_freq == old_freq)

return 0;

if (table &&

!cpufreq_frequency_table_target(policy,table,new_freq,prefered_relation,&index))

{

target = table[index].frequency;

if (target == old_freq) {

// if for example we are ramping up to *at most* current + ramp_up_step

// but there is no such frequency higher than the current, try also

// to ramp up to *at least* current + ramp_up_step.

if (new_freq > old_freq && prefered_relation==CPUFREQ_RELATION_H

&& !cpufreq_frequency_table_target(policy,table,new_freq,

CPUFREQ_RELATION_L,&index))

target = table[index].frequency;

// simlarly for ramping down:

else if (new_freq < old_freq && prefered_relation==CPUFREQ_RELATION_L

&& !cpufreq_frequency_table_target(policy,table,new_freq,

CPUFREQ_RELATION_H,&index))

target = table[index].frequency;

}

if (target == old_freq) {

// We should not get here:

// If we got here we tried to change to a validated new_freq which is different

// from old_freq, so there is no reason for us to remain at same frequency.

printk(KERN_WARNING "Smartass: frequency change failed: %d to %d => %d\n",

old_freq,new_freq,target);

return 0;

}

else target = new_freq;

__cpufreq_driver_target(policy, target, prefered_relation);

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassQ: jumping from %d to %d => %d (%d)\n",

old_freq,new_freq,target,policy->cur);

return target;

}

static void cpufreq_smartass_timer(unsigned long cpu)

{

u64 delta_idle;

u64 delta_time;

int cpu_load;

int old_freq;

u64 update_time;

u64 now_idle;

int queued_work = 0;

struct smartass_info_s *this_smartass = &per_cpu(smartass_info, cpu);

struct cpufreq_policy *policy = this_smartass->cur_policy;

now_idle = get_cpu_idle_time_us(cpu, &update_time);

old_freq = policy->cur;

if (this_smartass->idle_exit_time == 0 || update_time == this_smartass->idle_exit_time)

return;

delta_idle = cputime64_sub(now_idle, this_smartass->time_in_idle);

delta_time = cputime64_sub(update_time, this_smartass->idle_exit_time);

// If timer ran less than 1ms after short-term sample started, retry.

if (delta_time < 1000) {

if (!timer_pending(&this_smartass->timer))

reset_timer(cpu,this_smartass);

return;

}

if (delta_idle > delta_time)

cpu_load = 0;

else

cpu_load = 100 * (unsigned int)(delta_time - delta_idle) / (unsigned int)delta_time;

dprintk(SMARTASS_DEBUG_LOAD,"smartassT @ %d: load %d (delta_time %llu)\n",

old_freq,cpu_load,delta_time);

this_smartass->cur_cpu_load = cpu_load;

this_smartass->old_freq = old_freq;

// Scale up if load is above max or if there where no idle cycles since coming out of idle,

// additionally, if we are at or above the ideal_speed, verify we have been at this frequency

// for at least up_rate_us:

if (cpu_load > max_cpu_load || delta_idle == 0)

{

if (old_freq < policy->max &&

(old_freq < this_smartass->ideal_speed || delta_idle == 0 ||

cputime64_sub(update_time, this_smartass->freq_change_time) >= up_rate_us))

{

dprintk(SMARTASS_DEBUG_ALG,"smartassT @ %d ramp up: load %d (delta_idle %llu)\n",

old_freq,cpu_load,delta_idle);

this_smartass->ramp_dir = 1;

work_cpumask_set(cpu);

queue_work(up_wq, &freq_scale_work);

queued_work = 1;

}

else this_smartass->ramp_dir = 0;

}

// Similarly for scale down: load should be below min and if we are at or below ideal

// frequency we require that we have been at this frequency for at least down_rate_us:

else if (cpu_load < min_cpu_load && old_freq > policy->min &&

(old_freq > this_smartass->ideal_speed ||

cputime64_sub(update_time, this_smartass->freq_change_time) >= down_rate_us))

{

dprintk(SMARTASS_DEBUG_ALG,"smartassT @ %d ramp down: load %d (delta_idle %llu)\n",

old_freq,cpu_load,delta_idle);

this_smartass->ramp_dir = -1;

work_cpumask_set(cpu);

queue_work(down_wq, &freq_scale_work);

queued_work = 1;

}

else this_smartass->ramp_dir = 0;

// To avoid unnecessary load when the CPU is already at high load, we don't

// reset ourselves if we are at max speed. If and when there are idle cycles,

// the idle loop will activate the timer.

// Additionally, if we queued some work, the work task will reset the timer

// after it has done its adjustments.

if (!queued_work && old_freq < policy->max)

reset_timer(cpu,this_smartass);

}

static void cpufreq_idle(void)

{

struct smartass_info_s *this_smartass = &per_cpu(smartass_info, smp_processor_id());

struct cpufreq_policy *policy = this_smartass->cur_policy;

if (!this_smartass->enable) {

pm_idle_old();

return;

}

if (policy->cur == policy->min && timer_pending(&this_smartass->timer))

del_timer(&this_smartass->timer);

pm_idle_old();

if (!timer_pending(&this_smartass->timer))

reset_timer(smp_processor_id(), this_smartass);

}

/* We use the same work function to sale up and down */

static void cpufreq_smartass_freq_change_time_work(struct work_struct *work)

{

unsigned int cpu;

int new_freq;

int old_freq;

int ramp_dir;

struct smartass_info_s *this_smartass;

struct cpufreq_policy *policy;

unsigned int relation = CPUFREQ_RELATION_L;

for_each_possible_cpu(cpu) {

this_smartass = &per_cpu(smartass_info, cpu);

if (!work_cpumask_test_and_clear(cpu))

continue;

ramp_dir = this_smartass->ramp_dir;

this_smartass->ramp_dir = 0;

old_freq = this_smartass->old_freq;

policy = this_smartass->cur_policy;

if (old_freq != policy->cur) {

// frequency was changed by someone else?

printk(KERN_WARNING "Smartass: frequency changed by 3rd party: %d to %d\n",

old_freq,policy->cur);

new_freq = old_freq;

}

else if (ramp_dir > 0 && nr_running() > 1) {

// ramp up logic:

if (old_freq < this_smartass->ideal_speed)

new_freq = this_smartass->ideal_speed;

else if (ramp_up_step) {

new_freq = old_freq + ramp_up_step;

relation = CPUFREQ_RELATION_H;

}

else {

new_freq = policy->max;

relation = CPUFREQ_RELATION_H;

}

dprintk(SMARTASS_DEBUG_ALG,"smartassQ @ %d ramp up: ramp_dir=%d ideal=%d\n",

old_freq,ramp_dir,this_smartass->ideal_speed);

}

else if (ramp_dir < 0) {

// ramp down logic:

if (old_freq > this_smartass->ideal_speed) {

new_freq = this_smartass->ideal_speed;

relation = CPUFREQ_RELATION_H;

}

else if (ramp_down_step)

new_freq = old_freq - ramp_down_step;

else {

// Load heuristics: Adjust new_freq such that, assuming a linear

// scaling of load vs. frequency, the load in the new frequency

// will be max_cpu_load:

new_freq = old_freq * this_smartass->cur_cpu_load / max_cpu_load;

if (new_freq > old_freq) // min_cpu_load > max_cpu_load ?!

new_freq = old_freq -1;

}

dprintk(SMARTASS_DEBUG_ALG,"smartassQ @ %d ramp down: ramp_dir=%d ideal=%d\n",

old_freq,ramp_dir,this_smartass->ideal_speed);

}

else { // ramp_dir==0 ?! Could the timer change its mind about a queued ramp up/down

// before the work task gets to run?

// This may also happen if we refused to ramp up because the nr_running()==1

new_freq = old_freq;

dprintk(SMARTASS_DEBUG_ALG,"smartassQ @ %d nothing: ramp_dir=%d nr_running=%lu\n",

old_freq,ramp_dir,nr_running());

}

// do actual ramp up (returns 0, if frequency change failed):

new_freq = target_freq(policy,this_smartass,new_freq,old_freq,relation);

if (new_freq)

this_smartass->freq_change_time_in_idle =

get_cpu_idle_time_us(cpu,&this_smartass->freq_change_time);

// reset timer:

if (new_freq < policy->max)

reset_timer(cpu,this_smartass);

// if we are maxed out, it is pointless to use the timer

// (idle cycles wake up the timer when the timer comes)

else if (timer_pending(&this_smartass->timer))

del_timer(&this_smartass->timer);

}

static ssize_t show_debug_mask(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%lu\n", debug_mask);

}

static ssize_t store_debug_mask(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0)

debug_mask = input;

return res;

return count;

}

static ssize_t show_up_rate_us(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%lu\n", up_rate_us);

}

static ssize_t store_up_rate_us(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input >= 0 && input <= 100000000)

up_rate_us = input;

return res;

return count;

}

static ssize_t show_down_rate_us(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%lu\n", down_rate_us);

}

static ssize_t store_down_rate_us(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input >= 0 && input <= 100000000)

down_rate_us = input;

return res;

return count;

}

static ssize_t show_sleep_ideal_freq(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%u\n", sleep_ideal_freq);

}

static ssize_t store_sleep_ideal_freq(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input >= 0) {

sleep_ideal_freq = input;

if (suspended)

smartass_update_min_max_allcpus();

}

return res;

return count;

}

static ssize_t show_sleep_wakeup_freq(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%u\n", sleep_wakeup_freq);

}

static ssize_t store_sleep_wakeup_freq(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input >= 0)

sleep_wakeup_freq = input;

return res;

return count;

}

static ssize_t show_awake_ideal_freq(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%u\n", awake_ideal_freq);

}

static ssize_t store_awake_ideal_freq(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input >= 0) {

awake_ideal_freq = input;

if (!suspended)

smartass_update_min_max_allcpus();

}

return res;

return count;

}

static ssize_t show_sample_rate_jiffies(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%u\n", sample_rate_jiffies);

}

static ssize_t store_sample_rate_jiffies(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input > 0 && input <= 1000)

sample_rate_jiffies = input;

return res;

return count;

}

static ssize_t show_ramp_up_step(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%u\n", ramp_up_step);

}

static ssize_t store_ramp_up_step(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input >= 0)

ramp_up_step = input;

return res;

return count;

}

static ssize_t show_ramp_down_step(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%u\n", ramp_down_step);

}

static ssize_t store_ramp_down_step(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input >= 0)

ramp_down_step = input;

return res;

return count;

}

static ssize_t show_max_cpu_load(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%lu\n", max_cpu_load);

}

static ssize_t store_max_cpu_load(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input > 0 && input <= 100)

max_cpu_load = input;

return res;

return count;

}

static ssize_t show_min_cpu_load(struct cpufreq_policy *policy, char *buf)

{

return sprintf(buf, "%lu\n", min_cpu_load);

}

static ssize_t store_min_cpu_load(struct cpufreq_policy *policy, const char *buf, size_t count)

{

ssize_t res;

unsigned long input;

res = strict_strtoul(buf, 0, &input);

if (res >= 0 && input > 0 && input < 100)

min_cpu_load = input;

return res;

return count;

}

#define define_global_rw_attr(_name) \

static struct freq_attr _name##_attr = \

__ATTR(_name, 0644, show_##_name, store_##_name)

define_global_rw_attr(debug_mask);

define_global_rw_attr(up_rate_us);

define_global_rw_attr(down_rate_us);

define_global_rw_attr(sleep_ideal_freq);

define_global_rw_attr(sleep_wakeup_freq);

define_global_rw_attr(awake_ideal_freq);

define_global_rw_attr(sample_rate_jiffies);

define_global_rw_attr(ramp_up_step);

define_global_rw_attr(ramp_down_step);

define_global_rw_attr(max_cpu_load);

define_global_rw_attr(min_cpu_load);

static struct attribute * smartass_attributes[] = {

&debug_mask_attr.attr,

&up_rate_us_attr.attr,

&down_rate_us_attr.attr,

&sleep_ideal_freq_attr.attr,

&sleep_wakeup_freq_attr.attr,

&awake_ideal_freq_attr.attr,

&sample_rate_jiffies_attr.attr,

&ramp_up_step_attr.attr,

&ramp_down_step_attr.attr,

&max_cpu_load_attr.attr,

&min_cpu_load_attr.attr,

NULL,

};

static struct attribute_group smartass_attr_group = {

.attrs = smartass_attributes,

.name = "smartass",

.name = "smartassH3",

};

static int cpufreq_governor_smartass(struct cpufreq_policy *new_policy,

static int cpufreq_governor_smartass_h3(struct cpufreq_policy *new_policy,

unsigned int event)

{

unsigned int cpu = new_policy->cpu;

int rc;

struct smartass_info_s *this_smartass = &per_cpu(smartass_info, cpu);

switch (event) {

case CPUFREQ_GOV_START:

if ((!cpu_online(cpu)) || (!new_policy->cur))

return -EINVAL;

this_smartass->cur_policy = new_policy;

this_smartass->enable = 1;

smartass_update_min_max(this_smartass,new_policy,suspended);

this_smartass->freq_table = cpufreq_frequency_get_table(cpu);

if (!this_smartass->freq_table)

printk(KERN_WARNING "Smartass: no frequency table for cpu %d?!\n",cpu);

smp_wmb();

// Do not register the idle hook and create sysfs

// entries if we have already done so.

if (atomic_inc_return(&active_count) <= 1) {

rc = sysfs_create_group(&new_policy->kobj, &smartass_attr_group);

if (rc)

return rc;

pm_idle_old = pm_idle;

pm_idle = cpufreq_idle;

}

if (this_smartass->cur_policy->cur < new_policy->max && !timer_pending(&this_smartass->timer))

reset_timer(cpu,this_smartass);

break;

case CPUFREQ_GOV_LIMITS:

smartass_update_min_max(this_smartass,new_policy,suspended);

if (this_smartass->cur_policy->cur > new_policy->max) {

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassI: jumping to new max freq: %d\n",new_policy->max);

__cpufreq_driver_target(this_smartass->cur_policy,

new_policy->max, CPUFREQ_RELATION_H);

}

else if (this_smartass->cur_policy->cur < new_policy->min) {

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassI: jumping to new min freq: %d\n",new_policy->min);

__cpufreq_driver_target(this_smartass->cur_policy,

new_policy->min, CPUFREQ_RELATION_L);

}

if (this_smartass->cur_policy->cur < new_policy->max && !timer_pending(&this_smartass->timer))

reset_timer(cpu,this_smartass);

break;

case CPUFREQ_GOV_STOP:

this_smartass->enable = 0;

smp_wmb();

del_timer(&this_smartass->timer);

flush_work(&freq_scale_work);

this_smartass->idle_exit_time = 0;

if (atomic_dec_return(&active_count) <= 1) {

sysfs_remove_group(&new_policy->kobj,

&smartass_attr_group);

pm_idle = pm_idle_old;

}

break;

}

return 0;

}

static void smartass_suspend(int cpu, int suspend)

{

struct smartass_info_s *this_smartass = &per_cpu(smartass_info, smp_processor_id());

struct cpufreq_policy *policy = this_smartass->cur_policy;

unsigned int new_freq;

if (!this_smartass->enable)

return;

smartass_update_min_max(this_smartass,policy,suspend);

if (!suspend) { // resume at max speed:

new_freq = validate_freq(policy,sleep_wakeup_freq);

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassS: awaking at %d\n",new_freq);

__cpufreq_driver_target(policy, new_freq,

CPUFREQ_RELATION_L);

} else {

// to avoid wakeup issues with quick sleep/wakeup don't change actual frequency when entering sleep

// to allow some time to settle down. Instead we just reset our statistics (and reset the timer).

// Eventually, the timer will adjust the frequency if necessary.

this_smartass->freq_change_time_in_idle =

get_cpu_idle_time_us(cpu,&this_smartass->freq_change_time);

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassS: suspending at %d\n",policy->cur);

}

reset_timer(smp_processor_id(),this_smartass);

}

static void smartass_early_suspend(struct early_suspend *handler) {

int i;

if (suspended || sleep_ideal_freq==0) // disable behavior for sleep_ideal_freq==0

return;

suspended = 1;

for_each_online_cpu(i)

smartass_suspend(i,1);

}

static void smartass_late_resume(struct early_suspend *handler) {

int i;

if (!suspended) // already not suspended so nothing to do

return;

suspended = 0;

for_each_online_cpu(i)

smartass_suspend(i,0);

}

static struct early_suspend smartass_power_suspend = {

.suspend = smartass_early_suspend,

.resume = smartass_late_resume,

#ifdef CONFIG_MACH_HERO

.level = EARLY_SUSPEND_LEVEL_DISABLE_FB + 1,

#endif

};

static int __init cpufreq_smartass_init(void)

{

unsigned int i;

struct smartass_info_s *this_smartass;

debug_mask = 0;

up_rate_us = DEFAULT_UP_RATE_US;

down_rate_us = DEFAULT_DOWN_RATE

down_rate_us = DEFA

Gespeicherte Diffs

Originaltext

Datei öffnen

/*
 * drivers/cpufreq/cpufreq_smartass2.c
 *
 * Copyright (C) 2010 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Author: Erasmux
 *
 * Based on the interactive governor By Mike Chan (mike@android.com)
 * which was adaptated to 2.6.29 kernel by Nadlabak (pavel@doshaska.net)
 *
 * SMP support based on mod by faux123
 *
 * For a general overview of smartassV2 see the relavent part in
 * Documentation/cpu-freq/governors.txt
 *
 */

#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/cpufreq.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/moduleparam.h>
#include <asm/cputime.h>
#include <linux/earlysuspend.h>

/******************** Tunable parameters: ********************/

/*
 * The "ideal" frequency to use when awake. The governor will ramp up faster
 * towards the ideal frequency and slower after it has passed it. Similarly,
 * lowering the frequency towards the ideal frequency is faster than below it.
 */
#define DEFAULT_AWAKE_IDEAL_FREQ 600000
static unsigned int awake_ideal_freq;

/*
 * The "ideal" frequency to use when suspended.
 * When set to 0, the governor will not track the suspended state (meaning
 * that practically when sleep_ideal_freq==0 the awake_ideal_freq is used
 * also when suspended).
 */
#define DEFAULT_SLEEP_IDEAL_FREQ 128000
static unsigned int sleep_ideal_freq;

/*
 * Freqeuncy delta when ramping up above the ideal freqeuncy.
 * Zero disables and causes to always jump straight to max frequency.
 * When below the ideal freqeuncy we always ramp up to the ideal freq.
 */
#define DEFAULT_RAMP_UP_STEP 128000
static unsigned int ramp_up_step;

/*
 * Freqeuncy delta when ramping down below the ideal freqeuncy.
 * Zero disables and will calculate ramp down according to load heuristic.
 * When above the ideal freqeuncy we always ramp down to the ideal freq.
 */
#define DEFAULT_RAMP_DOWN_STEP 256000
static unsigned int ramp_down_step;

/*
 * CPU freq will be increased if measured load > max_cpu_load;
 */
#define DEFAULT_MAX_CPU_LOAD 50
static unsigned long max_cpu_load;

/*
 * CPU freq will be decreased if measured load < min_cpu_load;
 */
#define DEFAULT_MIN_CPU_LOAD 25
static unsigned long min_cpu_load;

/*
 * The minimum amount of time to spend at a frequency before we can ramp up.
 * Notice we ignore this when we are below the ideal frequency.
 */
#define DEFAULT_UP_RATE_US 48000;
static unsigned long up_rate_us;

/*
 * The minimum amount of time to spend at a frequency before we can ramp down.
 * Notice we ignore this when we are above the ideal frequency.
 */
#define DEFAULT_DOWN_RATE_US 99000;
static unsigned long down_rate_us;

/*
 * The frequency to set when waking up from sleep.
 * When sleep_ideal_freq=0 this will have no effect.
 */
#define DEFAULT_SLEEP_WAKEUP_FREQ 99999999
static unsigned int sleep_wakeup_freq;

/*
 * Sampling rate, I highly recommend to leave it at 2.
 */
#define DEFAULT_SAMPLE_RATE_JIFFIES 2
static unsigned int sample_rate_jiffies;

/*************** End of tunables ***************/

static void (*pm_idle_old)(void);
static atomic_t active_count = ATOMIC_INIT(0);

struct smartass_info_s {
	struct cpufreq_policy *cur_policy;
	struct cpufreq_frequency_table *freq_table;
	struct timer_list timer;
	u64 time_in_idle;
	u64 idle_exit_time;
	u64 freq_change_time;
	u64 freq_change_time_in_idle;
	int cur_cpu_load;
	int old_freq;
	int ramp_dir;
	unsigned int enable;
	int ideal_speed;
};
static DEFINE_PER_CPU(struct smartass_info_s, smartass_info);

/* Workqueues handle frequency scaling */
static struct workqueue_struct *up_wq;
static struct workqueue_struct *down_wq;
static struct work_struct freq_scale_work;

static cpumask_t work_cpumask;
static spinlock_t cpumask_lock;

static unsigned int suspended;

#define dprintk(flag,msg...) do { \
	if (debug_mask & flag) printk(KERN_DEBUG msg); \
	} while (0)

enum {
	SMARTASS_DEBUG_JUMPS=1,
	SMARTASS_DEBUG_LOAD=2,
	SMARTASS_DEBUG_ALG=4
};

/*
 * Combination of the above debug flags.
 */
static unsigned long debug_mask;

static int cpufreq_governor_smartass(struct cpufreq_policy *policy,
		unsigned int event);

#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS2
static
#endif
struct cpufreq_governor cpufreq_gov_smartass2 = {
	.name = "smartassV2",
	.governor = cpufreq_governor_smartass,
	.max_transition_latency = 9000000,
	.owner = THIS_MODULE,
};

inline static void smartass_update_min_max(struct smartass_info_s *this_smartass, struct cpufreq_policy *policy, int suspend) {
	if (suspend) {
		this_smartass->ideal_speed = // sleep_ideal_freq; but make sure it obeys the policy min/max
			policy->max > sleep_ideal_freq ?
			(sleep_ideal_freq > policy->min ? sleep_ideal_freq : policy->min) : policy->max;
	} else {
		this_smartass->ideal_speed = // awake_ideal_freq; but make sure it obeys the policy min/max
			policy->min < awake_ideal_freq ?
			(awake_ideal_freq < policy->max ? awake_ideal_freq : policy->max) : policy->min;
	}
}

inline static void smartass_update_min_max_allcpus(void) {
	unsigned int i;
	for_each_online_cpu(i) {
		struct smartass_info_s *this_smartass = &per_cpu(smartass_info, i);
		if (this_smartass->enable)
			smartass_update_min_max(this_smartass,this_smartass->cur_policy,suspended);
	}
}

inline static unsigned int validate_freq(struct cpufreq_policy *policy, int freq) {
	if (freq > (int)policy->max)
		return policy->max;
	if (freq < (int)policy->min)
		return policy->min;
	return freq;
}

inline static void reset_timer(unsigned long cpu, struct smartass_info_s *this_smartass) {
	this_smartass->time_in_idle = get_cpu_idle_time_us(cpu, &this_smartass->idle_exit_time);
	mod_timer(&this_smartass->timer, jiffies + sample_rate_jiffies);
}

inline static void work_cpumask_set(unsigned long cpu) {
	unsigned long flags;
	spin_lock_irqsave(&cpumask_lock, flags);
	cpumask_set_cpu(cpu, &work_cpumask);
	spin_unlock_irqrestore(&cpumask_lock, flags);
}

inline static int work_cpumask_test_and_clear(unsigned long cpu) {
	unsigned long flags;
	int res = 0;
	spin_lock_irqsave(&cpumask_lock, flags);
	res = test_and_clear_bit(cpu, work_cpumask.bits);
	spin_unlock_irqrestore(&cpumask_lock, flags);
	return res;
}

inline static int target_freq(struct cpufreq_policy *policy, struct smartass_info_s *this_smartass,
			      int new_freq, int old_freq, int prefered_relation) {
	int index, target;
	struct cpufreq_frequency_table *table = this_smartass->freq_table;

if (new_freq == old_freq)
		return 0;
	new_freq = validate_freq(policy,new_freq);
	if (new_freq == old_freq)
		return 0;

if (table &&
	    !cpufreq_frequency_table_target(policy,table,new_freq,prefered_relation,&index))
	{
		target = table[index].frequency;
		if (target == old_freq) {
			// if for example we are ramping up to *at most* current + ramp_up_step
			// but there is no such frequency higher than the current, try also
			// to ramp up to *at least* current + ramp_up_step.
			if (new_freq > old_freq && prefered_relation==CPUFREQ_RELATION_H
			    && !cpufreq_frequency_table_target(policy,table,new_freq,
							       CPUFREQ_RELATION_L,&index))
				target = table[index].frequency;
			// simlarly for ramping down:
			else if (new_freq < old_freq && prefered_relation==CPUFREQ_RELATION_L
				&& !cpufreq_frequency_table_target(policy,table,new_freq,
								   CPUFREQ_RELATION_H,&index))
				target = table[index].frequency;
		}

if (target == old_freq) {
			// We should not get here:
			// If we got here we tried to change to a validated new_freq which is different
			// from old_freq, so there is no reason for us to remain at same frequency.
			printk(KERN_WARNING "Smartass: frequency change failed: %d to %d => %d\n",
			       old_freq,new_freq,target);
			return 0;
		}
	}
	else target = new_freq;

__cpufreq_driver_target(policy, target, prefered_relation);

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassQ: jumping from %d to %d => %d (%d)\n",
		old_freq,new_freq,target,policy->cur);

return target;
}

static void cpufreq_smartass_timer(unsigned long cpu)
{
	u64 delta_idle;
	u64 delta_time;
	int cpu_load;
	int old_freq;
	u64 update_time;
	u64 now_idle;
	int queued_work = 0;
	struct smartass_info_s *this_smartass = &per_cpu(smartass_info, cpu);
	struct cpufreq_policy *policy = this_smartass->cur_policy;

now_idle = get_cpu_idle_time_us(cpu, &update_time);
	old_freq = policy->cur;

if (this_smartass->idle_exit_time == 0 || update_time == this_smartass->idle_exit_time)
		return;

delta_idle = cputime64_sub(now_idle, this_smartass->time_in_idle);
	delta_time = cputime64_sub(update_time, this_smartass->idle_exit_time);

// If timer ran less than 1ms after short-term sample started, retry.
	if (delta_time < 1000) {
		if (!timer_pending(&this_smartass->timer))
			reset_timer(cpu,this_smartass);
		return;
	}

if (delta_idle > delta_time)
		cpu_load = 0;
	else
		cpu_load = 100 * (unsigned int)(delta_time - delta_idle) / (unsigned int)delta_time;

dprintk(SMARTASS_DEBUG_LOAD,"smartassT @ %d: load %d (delta_time %llu)\n",
		old_freq,cpu_load,delta_time);

this_smartass->cur_cpu_load = cpu_load;
	this_smartass->old_freq = old_freq;

// Scale up if load is above max or if there where no idle cycles since coming out of idle,
	// additionally, if we are at or above the ideal_speed, verify we have been at this frequency
	// for at least up_rate_us:
	if (cpu_load > max_cpu_load || delta_idle == 0)
	{
		if (old_freq < policy->max &&
			 (old_freq < this_smartass->ideal_speed || delta_idle == 0 ||
			  cputime64_sub(update_time, this_smartass->freq_change_time) >= up_rate_us))
		{
			dprintk(SMARTASS_DEBUG_ALG,"smartassT @ %d ramp up: load %d (delta_idle %llu)\n",
				old_freq,cpu_load,delta_idle);
			this_smartass->ramp_dir = 1;
			work_cpumask_set(cpu);
			queue_work(up_wq, &freq_scale_work);
			queued_work = 1;
		}
		else this_smartass->ramp_dir = 0;
	}
	// Similarly for scale down: load should be below min and if we are at or below ideal
	// frequency we require that we have been at this frequency for at least down_rate_us:
	else if (cpu_load < min_cpu_load && old_freq > policy->min &&
		 (old_freq > this_smartass->ideal_speed ||
		  cputime64_sub(update_time, this_smartass->freq_change_time) >= down_rate_us))
	{
		dprintk(SMARTASS_DEBUG_ALG,"smartassT @ %d ramp down: load %d (delta_idle %llu)\n",
			old_freq,cpu_load,delta_idle);
		this_smartass->ramp_dir = -1;
		work_cpumask_set(cpu);
		queue_work(down_wq, &freq_scale_work);
		queued_work = 1;
	}
	else this_smartass->ramp_dir = 0;

// To avoid unnecessary load when the CPU is already at high load, we don't
	// reset ourselves if we are at max speed. If and when there are idle cycles,
	// the idle loop will activate the timer.
	// Additionally, if we queued some work, the work task will reset the timer
	// after it has done its adjustments.
	if (!queued_work && old_freq < policy->max)
		reset_timer(cpu,this_smartass);
}

static void cpufreq_idle(void)
{
	struct smartass_info_s *this_smartass = &per_cpu(smartass_info, smp_processor_id());
	struct cpufreq_policy *policy = this_smartass->cur_policy;

if (!this_smartass->enable) {
		pm_idle_old();
		return;
	}

if (policy->cur == policy->min && timer_pending(&this_smartass->timer))
		del_timer(&this_smartass->timer);

pm_idle_old();

if (!timer_pending(&this_smartass->timer))
		reset_timer(smp_processor_id(), this_smartass);
}

/* We use the same work function to sale up and down */
static void cpufreq_smartass_freq_change_time_work(struct work_struct *work)
{
	unsigned int cpu;
	int new_freq;
	int old_freq;
	int ramp_dir;
	struct smartass_info_s *this_smartass;
	struct cpufreq_policy *policy;
	unsigned int relation = CPUFREQ_RELATION_L;
	for_each_possible_cpu(cpu) {
		this_smartass = &per_cpu(smartass_info, cpu);
		if (!work_cpumask_test_and_clear(cpu))
			continue;

ramp_dir = this_smartass->ramp_dir;
		this_smartass->ramp_dir = 0;

old_freq = this_smartass->old_freq;
		policy = this_smartass->cur_policy;

if (old_freq != policy->cur) {
			// frequency was changed by someone else?
			printk(KERN_WARNING "Smartass: frequency changed by 3rd party: %d to %d\n",
			       old_freq,policy->cur);
			new_freq = old_freq;
		}
		else if (ramp_dir > 0 && nr_running() > 1) {
			// ramp up logic:
			if (old_freq < this_smartass->ideal_speed)
				new_freq = this_smartass->ideal_speed;
			else if (ramp_up_step) {
				new_freq = old_freq + ramp_up_step;
				relation = CPUFREQ_RELATION_H;
			}
			else {
				new_freq = policy->max;
				relation = CPUFREQ_RELATION_H;
			}
			dprintk(SMARTASS_DEBUG_ALG,"smartassQ @ %d ramp up: ramp_dir=%d ideal=%d\n",
				old_freq,ramp_dir,this_smartass->ideal_speed);
		}
		else if (ramp_dir < 0) {
			// ramp down logic:
			if (old_freq > this_smartass->ideal_speed) {
				new_freq = this_smartass->ideal_speed;
				relation = CPUFREQ_RELATION_H;
			}
			else if (ramp_down_step)
				new_freq = old_freq - ramp_down_step;
			else {
				// Load heuristics: Adjust new_freq such that, assuming a linear
				// scaling of load vs. frequency, the load in the new frequency
				// will be max_cpu_load:
				new_freq = old_freq * this_smartass->cur_cpu_load / max_cpu_load;
				if (new_freq > old_freq) // min_cpu_load > max_cpu_load ?!
					new_freq = old_freq -1;
			}
			dprintk(SMARTASS_DEBUG_ALG,"smartassQ @ %d ramp down: ramp_dir=%d ideal=%d\n",
				old_freq,ramp_dir,this_smartass->ideal_speed);
		}
		else { // ramp_dir==0 ?! Could the timer change its mind about a queued ramp up/down
		       // before the work task gets to run?
		       // This may also happen if we refused to ramp up because the nr_running()==1
			new_freq = old_freq;
			dprintk(SMARTASS_DEBUG_ALG,"smartassQ @ %d nothing: ramp_dir=%d nr_running=%lu\n",
				old_freq,ramp_dir,nr_running());
		}

// do actual ramp up (returns 0, if frequency change failed):
		new_freq = target_freq(policy,this_smartass,new_freq,old_freq,relation);
		if (new_freq)
			this_smartass->freq_change_time_in_idle =
				get_cpu_idle_time_us(cpu,&this_smartass->freq_change_time);

// reset timer:
		if (new_freq < policy->max)
			reset_timer(cpu,this_smartass);
		// if we are maxed out, it is pointless to use the timer
		// (idle cycles wake up the timer when the timer comes)
		else if (timer_pending(&this_smartass->timer))
			del_timer(&this_smartass->timer);
	}
}

static ssize_t show_debug_mask(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%lu\n", debug_mask);
}

static ssize_t store_debug_mask(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0)
		debug_mask = input;
	return res;
}

static ssize_t show_up_rate_us(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%lu\n", up_rate_us);
}

static ssize_t store_up_rate_us(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input >= 0 && input <= 100000000)
		up_rate_us = input;
	return res;
}

static ssize_t show_down_rate_us(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%lu\n", down_rate_us);
}

static ssize_t store_down_rate_us(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input >= 0 && input <= 100000000)
		down_rate_us = input;
	return res;
}

static ssize_t show_sleep_ideal_freq(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%u\n", sleep_ideal_freq);
}

static ssize_t store_sleep_ideal_freq(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input >= 0) {
		sleep_ideal_freq = input;
		if (suspended)
			smartass_update_min_max_allcpus();
	}
	return res;
}

static ssize_t show_sleep_wakeup_freq(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%u\n", sleep_wakeup_freq);
}

static ssize_t store_sleep_wakeup_freq(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input >= 0)
		sleep_wakeup_freq = input;
	return res;
}

static ssize_t show_awake_ideal_freq(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%u\n", awake_ideal_freq);
}

static ssize_t store_awake_ideal_freq(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input >= 0) {
		awake_ideal_freq = input;
		if (!suspended)
			smartass_update_min_max_allcpus();
	}
	return res;
}

static ssize_t show_sample_rate_jiffies(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%u\n", sample_rate_jiffies);
}

static ssize_t store_sample_rate_jiffies(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input > 0 && input <= 1000)
		sample_rate_jiffies = input;
	return res;
}

static ssize_t show_ramp_up_step(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%u\n", ramp_up_step);
}

static ssize_t store_ramp_up_step(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input >= 0)
		ramp_up_step = input;
	return res;
}

static ssize_t show_ramp_down_step(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%u\n", ramp_down_step);
}

static ssize_t store_ramp_down_step(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input >= 0)
		ramp_down_step = input;
	return res;
}

static ssize_t show_max_cpu_load(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%lu\n", max_cpu_load);
}

static ssize_t store_max_cpu_load(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input > 0 && input <= 100)
		max_cpu_load = input;
	return res;
}

static ssize_t show_min_cpu_load(struct cpufreq_policy *policy, char *buf)
{
	return sprintf(buf, "%lu\n", min_cpu_load);
}

static ssize_t store_min_cpu_load(struct cpufreq_policy *policy, const char *buf, size_t count)
{
	ssize_t res;
	unsigned long input;
	res = strict_strtoul(buf, 0, &input);
	if (res >= 0 && input > 0 && input < 100)
		min_cpu_load = input;
	return res;
}

#define define_global_rw_attr(_name)		\
static struct freq_attr _name##_attr =		\
	__ATTR(_name, 0644, show_##_name, store_##_name)

define_global_rw_attr(debug_mask);
define_global_rw_attr(up_rate_us);
define_global_rw_attr(down_rate_us);
define_global_rw_attr(sleep_ideal_freq);
define_global_rw_attr(sleep_wakeup_freq);
define_global_rw_attr(awake_ideal_freq);
define_global_rw_attr(sample_rate_jiffies);
define_global_rw_attr(ramp_up_step);
define_global_rw_attr(ramp_down_step);
define_global_rw_attr(max_cpu_load);
define_global_rw_attr(min_cpu_load);

static struct attribute * smartass_attributes[] = {
	&debug_mask_attr.attr,
	&up_rate_us_attr.attr,
	&down_rate_us_attr.attr,
	&sleep_ideal_freq_attr.attr,
	&sleep_wakeup_freq_attr.attr,
	&awake_ideal_freq_attr.attr,
	&sample_rate_jiffies_attr.attr,
	&ramp_up_step_attr.attr,
	&ramp_down_step_attr.attr,
	&max_cpu_load_attr.attr,
	&min_cpu_load_attr.attr,
	NULL,
};

static struct attribute_group smartass_attr_group = {
	.attrs = smartass_attributes,
	.name = "smartass",
};

static int cpufreq_governor_smartass(struct cpufreq_policy *new_policy,
		unsigned int event)
{
	unsigned int cpu = new_policy->cpu;
	int rc;
	struct smartass_info_s *this_smartass = &per_cpu(smartass_info, cpu);

switch (event) {
	case CPUFREQ_GOV_START:
		if ((!cpu_online(cpu)) || (!new_policy->cur))
			return -EINVAL;

this_smartass->cur_policy = new_policy;

this_smartass->enable = 1;

smartass_update_min_max(this_smartass,new_policy,suspended);

this_smartass->freq_table = cpufreq_frequency_get_table(cpu);
		if (!this_smartass->freq_table)
			printk(KERN_WARNING "Smartass: no frequency table for cpu %d?!\n",cpu);

smp_wmb();

// Do not register the idle hook and create sysfs
		// entries if we have already done so.
		if (atomic_inc_return(&active_count) <= 1) {
                        rc = sysfs_create_group(&new_policy->kobj, &smartass_attr_group);
			if (rc)
				return rc;

pm_idle_old = pm_idle;
			pm_idle = cpufreq_idle;
		}

if (this_smartass->cur_policy->cur < new_policy->max && !timer_pending(&this_smartass->timer))
			reset_timer(cpu,this_smartass);

break;

case CPUFREQ_GOV_LIMITS:
		smartass_update_min_max(this_smartass,new_policy,suspended);

if (this_smartass->cur_policy->cur > new_policy->max) {
			dprintk(SMARTASS_DEBUG_JUMPS,"SmartassI: jumping to new max freq: %d\n",new_policy->max);
			__cpufreq_driver_target(this_smartass->cur_policy,
						new_policy->max, CPUFREQ_RELATION_H);
		}
		else if (this_smartass->cur_policy->cur < new_policy->min) {
			dprintk(SMARTASS_DEBUG_JUMPS,"SmartassI: jumping to new min freq: %d\n",new_policy->min);
			__cpufreq_driver_target(this_smartass->cur_policy,
						new_policy->min, CPUFREQ_RELATION_L);
		}

if (this_smartass->cur_policy->cur < new_policy->max && !timer_pending(&this_smartass->timer))
			reset_timer(cpu,this_smartass);

break;

case CPUFREQ_GOV_STOP:
		this_smartass->enable = 0;
		smp_wmb();
		del_timer(&this_smartass->timer);
		flush_work(&freq_scale_work);
		this_smartass->idle_exit_time = 0;

if (atomic_dec_return(&active_count) <= 1) {
			sysfs_remove_group(&new_policy->kobj,
					   &smartass_attr_group);
			pm_idle = pm_idle_old;
		}
		break;
	}

return 0;
}

static void smartass_suspend(int cpu, int suspend)
{
	struct smartass_info_s *this_smartass = &per_cpu(smartass_info, smp_processor_id());
	struct cpufreq_policy *policy = this_smartass->cur_policy;
	unsigned int new_freq;

if (!this_smartass->enable)
		return;

smartass_update_min_max(this_smartass,policy,suspend);
	if (!suspend) { // resume at max speed:
		new_freq = validate_freq(policy,sleep_wakeup_freq);

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassS: awaking at %d\n",new_freq);

__cpufreq_driver_target(policy, new_freq,
					CPUFREQ_RELATION_L);
	} else {
		// to avoid wakeup issues with quick sleep/wakeup don't change actual frequency when entering sleep
		// to allow some time to settle down. Instead we just reset our statistics (and reset the timer).
		// Eventually, the timer will adjust the frequency if necessary.

this_smartass->freq_change_time_in_idle =
			get_cpu_idle_time_us(cpu,&this_smartass->freq_change_time);

dprintk(SMARTASS_DEBUG_JUMPS,"SmartassS: suspending at %d\n",policy->cur);
	}

reset_timer(smp_processor_id(),this_smartass);
}

static void smartass_early_suspend(struct early_suspend *handler) {
	int i;
	if (suspended || sleep_ideal_freq==0) // disable behavior for sleep_ideal_freq==0
		return;
	suspended = 1;
	for_each_online_cpu(i)
		smartass_suspend(i,1);
}

static void smartass_late_resume(struct early_suspend *handler) {
	int i;
	if (!suspended) // already not suspended so nothing to do
		return;
	suspended = 0;
	for_each_online_cpu(i)
		smartass_suspend(i,0);
}

static struct early_suspend smartass_power_suspend = {
	.suspend = smartass_early_suspend,
	.resume = smartass_late_resume,
#ifdef CONFIG_MACH_HERO
	.level = EARLY_SUSPEND_LEVEL_DISABLE_FB + 1,
#endif
};

static int __init cpufreq_smartass_init(void)
{
	unsigned int i;
	struct smartass_info_s *this_smartass;
	debug_mask = 0;
	up_rate_us = DEFAULT_UP_RATE_US;
	down_rate_us = DEFAULT_DOWN_RATE_US;
	sleep_ideal_freq = DEFAULT_SLEEP_IDEAL_FREQ;
	sleep_wakeup_freq = DEFAULT_SLEEP_WAKEUP_FREQ;
	awake_ideal_freq = DEFAULT_AWAKE_IDEAL_FREQ;
	sample_rate_jiffies = DEFAULT_SAMPLE_RATE_JIFFIES;
	ramp_up_step = DEFAULT_RAMP_UP_STEP;
	ramp_down_step = DEFAULT_RAMP_DOWN_STEP;
	max_cpu_load = DEFAULT_MAX_CPU_LOAD;
	min_cpu_load = DEFAULT_MIN_CPU_LOAD;

spin_lock_init(&cpumask_lock);

suspended = 0;

/* Initalize per-cpu data: */
	for_each_possible_cpu(i) {
		this_smartass = &per_cpu(smartass_info, i);
		this_smartass->enable = 0;
		this_smartass->cur_policy = 0;
		this_smartass->ramp_dir = 0;
		this_smartass->time_in_idle = 0;
		this_smartass->idle_exit_time = 0;
		this_smartass->freq_change_time = 0;
		this_smartass->freq_change_time_in_idle = 0;
		this_smartass->cur_cpu_load = 0;
		// intialize timer:
		init_timer_deferrable(&this_smartass->timer);
		this_smartass->timer.function = cpufreq_smartass_timer;
		this_smartass->timer.data = i;
		work_cpumask_test_and_clear(i);
	}

// Scale up is high priority
	up_wq = create_rt_workqueue("ksmartass_up");
	down_wq = create_workqueue("ksmartass_down");
	if (!up_wq || !down_wq)
		return -ENOMEM;

INIT_WORK(&freq_scale_work, cpufreq_smartass_freq_change_time_work);

register_early_suspend(&smartass_power_suspend);

return cpufreq_register_governor(&cpufreq_gov_smartass2);
}

#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS2
fs_initcall(cpufreq_smartass_init);
#else
module_init(cpufreq_smartass_init);
#endif

static void __exit cpufreq_smartass_exit(void)
{
	cpufreq_unregister_governor(&cpufreq_gov_smartass2);
	destroy_workqueue(up_wq);
	destroy_workqueue(down_wq);
}

module_exit(cpufreq_smartass_exit);

MODULE_AUTHOR ("Erasmux");
MODULE_DESCRIPTION ("'cpufreq_smartass2' - A smart cpufreq governor");
MODULE_LICENSE ("GPL");

Geänderter Text

Datei öffnen

/*
 * drivers/cpufreq/cpufreq_smartassH3.c
 *
 * Copyright (C) 2010 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Author: Erasmux
 *
 * Based on the interactive governor By Mike Chan (mike@android.com)
 * which was adaptated to 2.6.29 kernel by Nadlabak (pavel@doshaska.net)
 *
 * SMP support based on mod by faux123
 *
 * For a general overview of smartassV2 see the relavent part in
 * Documentation/cpu-freq/governors.txt
 *
 */

/******************** Tunable parameters: ********************/

/*
 * CPU freq will be increased if measured load > max_cpu_load;
 */
#define DEFAULT_MAX_CPU_LOAD 85
static unsigned long max_cpu_load;

/*
 * CPU freq will be decreased if measured load < min_cpu_load;
 */
#define DEFAULT_MIN_CPU_LOAD 70
static unsigned long min_cpu_load;

/*
 * The minimum amount of time to spend at a frequency before we can ramp down.
 * Notice we ignore this when we are above the ideal frequency.
 */
#define DEFAULT_DOWN_RATE_US 49000;
static unsigned long down_rate_us;

/*
 * The frequency to set when waking up from sleep.
 * When sleep_ideal_freq=0 this will have no effect.
 */
#define DEFAULT_SLEEP_WAKEUP_FREQ 99999999
static unsigned int sleep_wakeup_freq;

/*
 * Sampling rate, I highly recommend to leave it at 2.
 */
#define DEFAULT_SAMPLE_RATE_JIFFIES 2
static unsigned int sample_rate_jiffies;

/*************** End of tunables ***************/

static void (*pm_idle_old)(void);
static atomic_t active_count = ATOMIC_INIT(0);

/* Workqueues handle frequency scaling */
static struct workqueue_struct *up_wq;
static struct workqueue_struct *down_wq;
static struct work_struct freq_scale_work;

static cpumask_t work_cpumask;
static spinlock_t cpumask_lock;

static unsigned int suspended;

#define dprintk(flag,msg...) do { \
	if (debug_mask & flag) printk(KERN_DEBUG msg); \
	} while (0)

enum {
	SMARTASS_DEBUG_JUMPS=1,
	SMARTASS_DEBUG_LOAD=2,
	SMARTASS_DEBUG_ALG=4
};

/*
 * Combination of the above debug flags.
 */
static unsigned long debug_mask;

static int cpufreq_governor_smartass_h3(struct cpufreq_policy *policy,
		unsigned int event);

#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASSH3
static
#endif
struct cpufreq_governor cpufreq_gov_smartass_h3 = {
	.name = "SmartassH3",
	.governor = cpufreq_governor_smartass_h3,
	.max_transition_latency = 9000000,
	.owner = THIS_MODULE,
};