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android_kernel_samsung_univ.../drivers/cpufreq/cpufreq_impulse.c
DarkLord1731 b195b282eb Add hell lot of CPU governors
2018-07-19 15:26:29 +02:00

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/*
* Impulse - Load Sensitive CPU Frequency Governor
*
* Copyright (c) 2014-2016, Pranav Vashi <neobuddy89@gmail.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/cpu.h>
#include <linux/cpumask.h>
#include <linux/cpufreq.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/sched/rt.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <asm/cputime.h>
#ifdef CONFIG_STATE_NOTIFIER
#include <linux/state_notifier.h>
#endif
struct cpufreq_impulse_policyinfo {
struct timer_list policy_timer;
struct timer_list policy_slack_timer;
spinlock_t load_lock; /* protects load tracking stat */
u64 last_evaluated_jiffy;
struct cpufreq_policy *policy;
struct cpufreq_frequency_table *freq_table;
spinlock_t target_freq_lock; /*protects target freq */
unsigned int target_freq;
unsigned int floor_freq;
unsigned int min_freq;
u64 floor_validate_time;
u64 hispeed_validate_time;
u64 max_freq_hyst_start_time;
struct rw_semaphore enable_sem;
bool reject_notification;
int governor_enabled;
struct cpufreq_impulse_tunables *cached_tunables;
unsigned long *cpu_busy_times;
};
/* Protected by per-policy load_lock */
struct cpufreq_impulse_cpuinfo {
u64 time_in_idle;
u64 time_in_idle_timestamp;
u64 cputime_speedadj;
u64 cputime_speedadj_timestamp;
unsigned int loadadjfreq;
};
static DEFINE_PER_CPU(struct cpufreq_impulse_policyinfo *, polinfo);
static DEFINE_PER_CPU(struct cpufreq_impulse_cpuinfo, cpuinfo);
/* realtime thread handles frequency scaling */
static struct task_struct *speedchange_task;
static cpumask_t speedchange_cpumask;
static spinlock_t speedchange_cpumask_lock;
static struct mutex gov_lock;
/* Target load. Lower values result in higher CPU speeds. */
#define DEFAULT_TARGET_LOAD 90
static unsigned int default_target_loads[] = {DEFAULT_TARGET_LOAD};
#define DEFAULT_TIMER_RATE (20 * USEC_PER_MSEC)
#define DEFAULT_TIMER_RATE_SUSP ((unsigned long)(50 * USEC_PER_MSEC))
#define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE
static unsigned int default_above_hispeed_delay[] = {
DEFAULT_ABOVE_HISPEED_DELAY };
struct cpufreq_impulse_tunables {
int usage_count;
/* Hi speed to bump to from lo speed when load burst (default max) */
unsigned int hispeed_freq;
/* Go to hi speed when CPU load at or above this value. */
#define DEFAULT_GO_HISPEED_LOAD 99
unsigned long go_hispeed_load;
/* Target load. Lower values result in higher CPU speeds. */
spinlock_t target_loads_lock;
unsigned int *target_loads;
int ntarget_loads;
/*
* The minimum amount of time to spend at a frequency before we can ramp
* down.
*/
#define DEFAULT_MIN_SAMPLE_TIME (80 * USEC_PER_MSEC)
unsigned long min_sample_time;
/*
* The sample rate of the timer used to increase frequency
*/
unsigned long timer_rate;
#ifdef CONFIG_STATE_NOTIFIER
unsigned long timer_rate_prev;
#endif
/*
* Wait this long before raising speed above hispeed, by default a
* single timer interval.
*/
spinlock_t above_hispeed_delay_lock;
unsigned int *above_hispeed_delay;
int nabove_hispeed_delay;
bool boosted;
/*
* Max additional time to wait in idle, beyond timer_rate, at speeds
* above minimum before wakeup to reduce speed, or -1 if unnecessary.
*/
#define DEFAULT_TIMER_SLACK (4 * DEFAULT_TIMER_RATE)
int timer_slack_val;
bool io_is_busy;
/*
* Whether to align timer windows across all CPUs.
*/
bool align_windows;
/*
* Stay at max freq for at least max_freq_hysteresis before dropping
* frequency.
*/
unsigned int max_freq_hysteresis;
/* Improves frequency selection for more energy */
bool powersave_bias;
};
/* For cases where we have single governor instance for system */
static struct cpufreq_impulse_tunables *common_tunables;
static struct cpufreq_impulse_tunables *cached_common_tunables;
static struct attribute_group *get_sysfs_attr(void);
/* Round to starting jiffy of next evaluation window */
static u64 round_to_nw_start(u64 jif,
struct cpufreq_impulse_tunables *tunables)
{
unsigned long step = usecs_to_jiffies(tunables->timer_rate);
u64 ret;
if (tunables->align_windows) {
do_div(jif, step);
ret = (jif + 1) * step;
} else {
ret = jiffies + usecs_to_jiffies(tunables->timer_rate);
}
return ret;
}
static void cpufreq_impulse_timer_resched(unsigned long cpu,
bool slack_only)
{
struct cpufreq_impulse_policyinfo *ppol = per_cpu(polinfo, cpu);
struct cpufreq_impulse_cpuinfo *pcpu;
struct cpufreq_impulse_tunables *tunables =
ppol->policy->governor_data;
u64 expires;
unsigned long flags;
int i;
spin_lock_irqsave(&ppol->load_lock, flags);
expires = round_to_nw_start(ppol->last_evaluated_jiffy, tunables);
if (!slack_only) {
for_each_cpu(i, ppol->policy->cpus) {
pcpu = &per_cpu(cpuinfo, i);
pcpu->time_in_idle = get_cpu_idle_time(i,
&pcpu->time_in_idle_timestamp,
tunables->io_is_busy);
pcpu->cputime_speedadj = 0;
pcpu->cputime_speedadj_timestamp =
pcpu->time_in_idle_timestamp;
}
del_timer(&ppol->policy_timer);
ppol->policy_timer.expires = expires;
add_timer(&ppol->policy_timer);
}
if (tunables->timer_slack_val >= 0 &&
ppol->target_freq > ppol->policy->min) {
expires += usecs_to_jiffies(tunables->timer_slack_val);
del_timer(&ppol->policy_slack_timer);
ppol->policy_slack_timer.expires = expires;
add_timer(&ppol->policy_slack_timer);
}
spin_unlock_irqrestore(&ppol->load_lock, flags);
}
/* The caller shall take enable_sem write semaphore to avoid any timer race.
* The policy_timer and policy_slack_timer must be deactivated when calling
* this function.
*/
static void cpufreq_impulse_timer_start(
struct cpufreq_impulse_tunables *tunables, int cpu)
{
struct cpufreq_impulse_policyinfo *ppol = per_cpu(polinfo, cpu);
struct cpufreq_impulse_cpuinfo *pcpu;
u64 expires = round_to_nw_start(ppol->last_evaluated_jiffy, tunables);
unsigned long flags;
int i;
spin_lock_irqsave(&ppol->load_lock, flags);
ppol->policy_timer.expires = expires;
add_timer(&ppol->policy_timer);
if (tunables->timer_slack_val >= 0 &&
ppol->target_freq > ppol->policy->min) {
expires += usecs_to_jiffies(tunables->timer_slack_val);
ppol->policy_slack_timer.expires = expires;
add_timer(&ppol->policy_slack_timer);
}
for_each_cpu(i, ppol->policy->cpus) {
pcpu = &per_cpu(cpuinfo, i);
pcpu->time_in_idle =
get_cpu_idle_time(i, &pcpu->time_in_idle_timestamp,
tunables->io_is_busy);
pcpu->cputime_speedadj = 0;
pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
}
spin_unlock_irqrestore(&ppol->load_lock, flags);
}
static unsigned int freq_to_above_hispeed_delay(
struct cpufreq_impulse_tunables *tunables,
unsigned int freq)
{
int i;
unsigned int ret;
unsigned long flags;
spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
for (i = 0; i < tunables->nabove_hispeed_delay - 1 &&
freq >= tunables->above_hispeed_delay[i+1]; i += 2)
;
ret = tunables->above_hispeed_delay[i];
spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
return ret;
}
static unsigned int freq_to_targetload(
struct cpufreq_impulse_tunables *tunables, unsigned int freq)
{
int i;
unsigned int ret;
unsigned long flags;
spin_lock_irqsave(&tunables->target_loads_lock, flags);
for (i = 0; i < tunables->ntarget_loads - 1 &&
freq >= tunables->target_loads[i+1]; i += 2)
;
ret = tunables->target_loads[i];
spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
return ret;
}
/*
* If increasing frequencies never map to a lower target load then
* choose_freq() will find the minimum frequency that does not exceed its
* target load given the current load.
*/
static unsigned int choose_freq(struct cpufreq_impulse_policyinfo *pcpu,
unsigned int loadadjfreq)
{
unsigned int freq = pcpu->policy->cur;
unsigned int prevfreq, freqmin, freqmax;
unsigned int tl;
int index;
freqmin = 0;
freqmax = UINT_MAX;
do {
prevfreq = freq;
tl = freq_to_targetload(pcpu->policy->governor_data, freq);
/*
* Find the lowest frequency where the computed load is less
* than or equal to the target load.
*/
if (cpufreq_frequency_table_target(
pcpu->policy, pcpu->freq_table, loadadjfreq / tl,
CPUFREQ_RELATION_L, &index))
break;
freq = pcpu->freq_table[index].frequency;
if (freq > prevfreq) {
/* The previous frequency is too low. */
freqmin = prevfreq;
if (freq >= freqmax) {
/*
* Find the highest frequency that is less
* than freqmax.
*/
if (cpufreq_frequency_table_target(
pcpu->policy, pcpu->freq_table,
freqmax - 1, CPUFREQ_RELATION_H,
&index))
break;
freq = pcpu->freq_table[index].frequency;
if (freq == freqmin) {
/*
* The first frequency below freqmax
* has already been found to be too
* low. freqmax is the lowest speed
* we found that is fast enough.
*/
freq = freqmax;
break;
}
}
} else if (freq < prevfreq) {
/* The previous frequency is high enough. */
freqmax = prevfreq;
if (freq <= freqmin) {
/*
* Find the lowest frequency that is higher
* than freqmin.
*/
if (cpufreq_frequency_table_target(
pcpu->policy, pcpu->freq_table,
freqmin + 1, CPUFREQ_RELATION_L,
&index))
break;
freq = pcpu->freq_table[index].frequency;
/*
* If freqmax is the first frequency above
* freqmin then we have already found that
* this speed is fast enough.
*/
if (freq == freqmax)
break;
}
}
/* If same frequency chosen as previous then done. */
} while (freq != prevfreq);
return freq;
}
static u64 update_load(int cpu)
{
struct cpufreq_impulse_policyinfo *ppol = per_cpu(polinfo, cpu);
struct cpufreq_impulse_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu);
struct cpufreq_impulse_tunables *tunables =
ppol->policy->governor_data;
u64 now;
u64 now_idle;
unsigned int delta_idle;
unsigned int delta_time;
u64 active_time;
now_idle = get_cpu_idle_time(cpu, &now, tunables->io_is_busy);
delta_idle = (unsigned int)(now_idle - pcpu->time_in_idle);
delta_time = (unsigned int)(now - pcpu->time_in_idle_timestamp);
if (delta_time <= delta_idle)
active_time = 0;
else
active_time = delta_time - delta_idle;
pcpu->cputime_speedadj += active_time * ppol->policy->cur;
pcpu->time_in_idle = now_idle;
pcpu->time_in_idle_timestamp = now;
return now;
}
#define MAX_LOCAL_LOAD 100
static void cpufreq_impulse_timer(unsigned long data)
{
u64 now;
unsigned int delta_time;
u64 cputime_speedadj;
int cpu_load;
struct cpufreq_impulse_policyinfo *ppol = per_cpu(polinfo, data);
struct cpufreq_impulse_tunables *tunables =
ppol->policy->governor_data;
struct cpufreq_impulse_cpuinfo *pcpu;
unsigned int new_freq;
unsigned int loadadjfreq = 0, tmploadadjfreq;
unsigned int index;
unsigned int this_hispeed_freq;
unsigned long flags;
unsigned long max_cpu;
int i, fcpu;
if (!down_read_trylock(&ppol->enable_sem))
return;
if (!ppol->governor_enabled)
goto exit;
if (cpu_is_offline(data))
goto exit;
fcpu = cpumask_first(ppol->policy->related_cpus);
now = ktime_to_us(ktime_get());
spin_lock_irqsave(&ppol->load_lock, flags);
ppol->last_evaluated_jiffy = get_jiffies_64();
#ifdef CONFIG_STATE_NOTIFIER
if (!state_suspended &&
tunables->timer_rate != tunables->timer_rate_prev)
tunables->timer_rate = tunables->timer_rate_prev;
else if (state_suspended &&
tunables->timer_rate != DEFAULT_TIMER_RATE_SUSP) {
tunables->timer_rate_prev = tunables->timer_rate;
tunables->timer_rate
= max(tunables->timer_rate,
DEFAULT_TIMER_RATE_SUSP);
}
#endif
max_cpu = cpumask_first(ppol->policy->cpus);
for_each_cpu(i, ppol->policy->cpus) {
pcpu = &per_cpu(cpuinfo, i);
now = update_load(i);
delta_time = (unsigned int)
(now - pcpu->cputime_speedadj_timestamp);
if (WARN_ON_ONCE(!delta_time))
continue;
cputime_speedadj = pcpu->cputime_speedadj;
do_div(cputime_speedadj, delta_time);
tmploadadjfreq = (unsigned int)cputime_speedadj * 100;
pcpu->loadadjfreq = tmploadadjfreq;
if (tmploadadjfreq > loadadjfreq) {
loadadjfreq = tmploadadjfreq;
max_cpu = i;
}
}
spin_unlock_irqrestore(&ppol->load_lock, flags);
spin_lock_irqsave(&ppol->target_freq_lock, flags);
cpu_load = loadadjfreq / ppol->policy->cur;
tunables->boosted = cpu_load >= tunables->go_hispeed_load;
#ifdef CONFIG_STATE_NOTIFIER
tunables->boosted = tunables->boosted && !state_suspended;
#endif
this_hispeed_freq = max(tunables->hispeed_freq, ppol->policy->min);
if (tunables->boosted) {
if (ppol->target_freq < this_hispeed_freq &&
cpu_load <= MAX_LOCAL_LOAD) {
new_freq = this_hispeed_freq;
} else {
new_freq = choose_freq(ppol, loadadjfreq);
if (new_freq < this_hispeed_freq)
new_freq = this_hispeed_freq;
}
} else {
new_freq = choose_freq(ppol, loadadjfreq);
if (new_freq > tunables->hispeed_freq &&
ppol->target_freq < tunables->hispeed_freq)
new_freq = tunables->hispeed_freq;
}
if (cpu_load <= MAX_LOCAL_LOAD &&
ppol->policy->cur >= this_hispeed_freq &&
new_freq > ppol->policy->cur &&
now - ppol->hispeed_validate_time <
freq_to_above_hispeed_delay(tunables, ppol->policy->cur)) {
spin_unlock_irqrestore(&ppol->target_freq_lock, flags);
goto rearm;
}
ppol->hispeed_validate_time = now;
if (cpufreq_frequency_table_target(ppol->policy, ppol->freq_table,
new_freq, CPUFREQ_RELATION_L,
&index)) {
spin_unlock_irqrestore(&ppol->target_freq_lock, flags);
goto rearm;
}
new_freq = ppol->freq_table[index].frequency;
if (new_freq < ppol->target_freq &&
now - ppol->max_freq_hyst_start_time <
tunables->max_freq_hysteresis) {
spin_unlock_irqrestore(&ppol->target_freq_lock, flags);
goto rearm;
}
/*
* Do not scale below floor_freq unless we have been at or above the
* floor frequency for the minimum sample time since last validated.
*/
if (new_freq < ppol->floor_freq) {
if (now - ppol->floor_validate_time <
tunables->min_sample_time) {
spin_unlock_irqrestore(&ppol->target_freq_lock, flags);
goto rearm;
}
}
/*
* Update the timestamp for checking whether speed has been held at
* or above the selected frequency for a minimum of min_sample_time,
* if not boosted to this_hispeed_freq. If boosted to this_hispeed_freq then we
* allow the speed to drop as soon as the boostpulse duration expires
* (or the indefinite boost is turned off).
*/
if (!tunables->boosted || new_freq > this_hispeed_freq) {
ppol->floor_freq = new_freq;
ppol->floor_validate_time = now;
}
if (new_freq == ppol->policy->max)
ppol->max_freq_hyst_start_time = now;
if (ppol->target_freq == new_freq &&
ppol->target_freq <= ppol->policy->cur) {
spin_unlock_irqrestore(&ppol->target_freq_lock, flags);
goto rearm;
}
ppol->target_freq = new_freq;
spin_unlock_irqrestore(&ppol->target_freq_lock, flags);
spin_lock_irqsave(&speedchange_cpumask_lock, flags);
cpumask_set_cpu(max_cpu, &speedchange_cpumask);
spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
wake_up_process(speedchange_task);
rearm:
if (!timer_pending(&ppol->policy_timer))
cpufreq_impulse_timer_resched(data, false);
exit:
up_read(&ppol->enable_sem);
return;
}
static int cpufreq_impulse_speedchange_task(void *data)
{
unsigned int cpu;
cpumask_t tmp_mask;
unsigned long flags;
struct cpufreq_impulse_policyinfo *ppol;
struct cpufreq_impulse_tunables *tunables;
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
spin_lock_irqsave(&speedchange_cpumask_lock, flags);
if (cpumask_empty(&speedchange_cpumask)) {
spin_unlock_irqrestore(&speedchange_cpumask_lock,
flags);
schedule();
if (kthread_should_stop())
break;
spin_lock_irqsave(&speedchange_cpumask_lock, flags);
}
set_current_state(TASK_RUNNING);
tmp_mask = speedchange_cpumask;
cpumask_clear(&speedchange_cpumask);
spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
for_each_cpu(cpu, &tmp_mask) {
ppol = per_cpu(polinfo, cpu);
if (!down_read_trylock(&ppol->enable_sem))
continue;
if (!ppol->governor_enabled) {
up_read(&ppol->enable_sem);
continue;
}
if (ppol->target_freq != ppol->policy->cur) {
tunables = ppol->policy->governor_data;
#ifdef CONFIG_STATE_NOTIFIER
if (tunables->powersave_bias || state_suspended)
#else
if (tunables->powersave_bias)
#endif
__cpufreq_driver_target(ppol->policy,
ppol->target_freq,
CPUFREQ_RELATION_C);
else
__cpufreq_driver_target(ppol->policy,
ppol->target_freq,
CPUFREQ_RELATION_H);
}
up_read(&ppol->enable_sem);
}
}
return 0;
}
static int cpufreq_impulse_notifier(
struct notifier_block *nb, unsigned long val, void *data)
{
struct cpufreq_freqs *freq = data;
struct cpufreq_impulse_policyinfo *ppol;
int cpu;
unsigned long flags;
if (val == CPUFREQ_PRECHANGE) {
ppol = per_cpu(polinfo, freq->cpu);
if (!ppol)
return 0;
if (!down_read_trylock(&ppol->enable_sem))
return 0;
if (!ppol->governor_enabled) {
up_read(&ppol->enable_sem);
return 0;
}
if (cpumask_first(ppol->policy->cpus) != freq->cpu) {
up_read(&ppol->enable_sem);
return 0;
}
spin_lock_irqsave(&ppol->load_lock, flags);
for_each_cpu(cpu, ppol->policy->cpus)
update_load(cpu);
spin_unlock_irqrestore(&ppol->load_lock, flags);
up_read(&ppol->enable_sem);
}
return 0;
}
static struct notifier_block cpufreq_notifier_block = {
.notifier_call = cpufreq_impulse_notifier,
};
static unsigned int *get_tokenized_data(const char *buf, int *num_tokens)
{
const char *cp;
int i;
int ntokens = 1;
unsigned int *tokenized_data;
int err = -EINVAL;
cp = buf;
while ((cp = strpbrk(cp + 1, " :")))
ntokens++;
if (!(ntokens & 0x1))
goto err;
tokenized_data = kmalloc(ntokens * sizeof(unsigned int), GFP_KERNEL);
if (!tokenized_data) {
err = -ENOMEM;
goto err;
}
cp = buf;
i = 0;
while (i < ntokens) {
if (sscanf(cp, "%u", &tokenized_data[i++]) != 1)
goto err_kfree;
cp = strpbrk(cp, " :");
if (!cp)
break;
cp++;
}
if (i != ntokens)
goto err_kfree;
*num_tokens = ntokens;
return tokenized_data;
err_kfree:
kfree(tokenized_data);
err:
return ERR_PTR(err);
}
static ssize_t show_target_loads(
struct cpufreq_impulse_tunables *tunables,
char *buf)
{
int i;
ssize_t ret = 0;
unsigned long flags;
spin_lock_irqsave(&tunables->target_loads_lock, flags);
for (i = 0; i < tunables->ntarget_loads; i++)
ret += sprintf(buf + ret, "%u%s", tunables->target_loads[i],
i & 0x1 ? ":" : " ");
sprintf(buf + ret - 1, "\n");
spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
return ret;
}
static ssize_t store_target_loads(
struct cpufreq_impulse_tunables *tunables,
const char *buf, size_t count)
{
int ntokens;
unsigned int *new_target_loads = NULL;
unsigned long flags;
new_target_loads = get_tokenized_data(buf, &ntokens);
if (IS_ERR(new_target_loads))
return PTR_RET(new_target_loads);
spin_lock_irqsave(&tunables->target_loads_lock, flags);
if (tunables->target_loads != default_target_loads)
kfree(tunables->target_loads);
tunables->target_loads = new_target_loads;
tunables->ntarget_loads = ntokens;
spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
return count;
}
static ssize_t show_above_hispeed_delay(
struct cpufreq_impulse_tunables *tunables, char *buf)
{
int i;
ssize_t ret = 0;
unsigned long flags;
spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
for (i = 0; i < tunables->nabove_hispeed_delay; i++)
ret += sprintf(buf + ret, "%u%s",
tunables->above_hispeed_delay[i],
i & 0x1 ? ":" : " ");
sprintf(buf + ret - 1, "\n");
spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
return ret;
}
static ssize_t store_above_hispeed_delay(
struct cpufreq_impulse_tunables *tunables,
const char *buf, size_t count)
{
int ntokens, i;
unsigned int *new_above_hispeed_delay = NULL;
unsigned long flags;
new_above_hispeed_delay = get_tokenized_data(buf, &ntokens);
if (IS_ERR(new_above_hispeed_delay))
return PTR_RET(new_above_hispeed_delay);
/* Make sure frequencies are in ascending order. */
for (i = 3; i < ntokens; i += 2) {
if (new_above_hispeed_delay[i] <=
new_above_hispeed_delay[i - 2]) {
kfree(new_above_hispeed_delay);
return -EINVAL;
}
}
spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
if (tunables->above_hispeed_delay != default_above_hispeed_delay)
kfree(tunables->above_hispeed_delay);
tunables->above_hispeed_delay = new_above_hispeed_delay;
tunables->nabove_hispeed_delay = ntokens;
spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
return count;
}
static ssize_t show_hispeed_freq(struct cpufreq_impulse_tunables *tunables,
char *buf)
{
return sprintf(buf, "%u\n", tunables->hispeed_freq);
}
static ssize_t store_hispeed_freq(struct cpufreq_impulse_tunables *tunables,
const char *buf, size_t count)
{
int ret;
long unsigned int val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
tunables->hispeed_freq = val;
return count;
}
#define show_store_one(file_name) \
static ssize_t show_##file_name( \
struct cpufreq_impulse_tunables *tunables, char *buf) \
{ \
return snprintf(buf, PAGE_SIZE, "%u\n", tunables->file_name); \
} \
static ssize_t store_##file_name( \
struct cpufreq_impulse_tunables *tunables, \
const char *buf, size_t count) \
{ \
int ret; \
long unsigned int val; \
\
ret = kstrtoul(buf, 0, &val); \
if (ret < 0) \
return ret; \
tunables->file_name = val; \
return count; \
}
show_store_one(max_freq_hysteresis);
show_store_one(align_windows);
static ssize_t show_go_hispeed_load(struct cpufreq_impulse_tunables
*tunables, char *buf)
{
return sprintf(buf, "%lu\n", tunables->go_hispeed_load);
}
static ssize_t store_go_hispeed_load(struct cpufreq_impulse_tunables
*tunables, const char *buf, size_t count)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
tunables->go_hispeed_load = val;
return count;
}
static ssize_t show_min_sample_time(struct cpufreq_impulse_tunables
*tunables, char *buf)
{
return sprintf(buf, "%lu\n", tunables->min_sample_time);
}
static ssize_t store_min_sample_time(struct cpufreq_impulse_tunables
*tunables, const char *buf, size_t count)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
tunables->min_sample_time = val;
return count;
}
static ssize_t show_timer_rate(struct cpufreq_impulse_tunables *tunables,
char *buf)
{
return sprintf(buf, "%lu\n", tunables->timer_rate);
}
static ssize_t store_timer_rate(struct cpufreq_impulse_tunables *tunables,
const char *buf, size_t count)
{
int ret;
unsigned long val, val_round;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
val_round = jiffies_to_usecs(usecs_to_jiffies(val));
if (val != val_round)
pr_warn("timer_rate not aligned to jiffy. Rounded up to %lu\n",
val_round);
tunables->timer_rate = val_round;
#ifdef CONFIG_STATE_NOTIFIER
tunables->timer_rate_prev = val_round;
#endif
return count;
}
static ssize_t show_timer_slack(struct cpufreq_impulse_tunables *tunables,
char *buf)
{
return sprintf(buf, "%d\n", tunables->timer_slack_val);
}
static ssize_t store_timer_slack(struct cpufreq_impulse_tunables *tunables,
const char *buf, size_t count)
{
int ret;
unsigned long val;
ret = kstrtol(buf, 10, &val);
if (ret < 0)
return ret;
tunables->timer_slack_val = val;
return count;
}
static ssize_t show_io_is_busy(struct cpufreq_impulse_tunables *tunables,
char *buf)
{
return sprintf(buf, "%u\n", tunables->io_is_busy);
}
static ssize_t store_io_is_busy(struct cpufreq_impulse_tunables *tunables,
const char *buf, size_t count)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
tunables->io_is_busy = val;
return count;
}
static ssize_t show_powersave_bias(struct cpufreq_impulse_tunables *tunables,
char *buf)
{
return sprintf(buf, "%u\n", tunables->powersave_bias);
}
static ssize_t store_powersave_bias(struct cpufreq_impulse_tunables *tunables,
const char *buf, size_t count)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
tunables->powersave_bias = val;
return count;
}
/*
* Create show/store routines
* - sys: One governor instance for complete SYSTEM
* - pol: One governor instance per struct cpufreq_policy
*/
#define show_gov_pol_sys(file_name) \
static ssize_t show_##file_name##_gov_sys \
(struct kobject *kobj, struct attribute *attr, char *buf) \
{ \
return show_##file_name(common_tunables, buf); \
} \
\
static ssize_t show_##file_name##_gov_pol \
(struct cpufreq_policy *policy, char *buf) \
{ \
return show_##file_name(policy->governor_data, buf); \
}
#define store_gov_pol_sys(file_name) \
static ssize_t store_##file_name##_gov_sys \
(struct kobject *kobj, struct attribute *attr, const char *buf, \
size_t count) \
{ \
return store_##file_name(common_tunables, buf, count); \
} \
\
static ssize_t store_##file_name##_gov_pol \
(struct cpufreq_policy *policy, const char *buf, size_t count) \
{ \
return store_##file_name(policy->governor_data, buf, count); \
}
#define show_store_gov_pol_sys(file_name) \
show_gov_pol_sys(file_name); \
store_gov_pol_sys(file_name)
show_store_gov_pol_sys(target_loads);
show_store_gov_pol_sys(above_hispeed_delay);
show_store_gov_pol_sys(hispeed_freq);
show_store_gov_pol_sys(go_hispeed_load);
show_store_gov_pol_sys(min_sample_time);
show_store_gov_pol_sys(timer_rate);
show_store_gov_pol_sys(timer_slack);
show_store_gov_pol_sys(io_is_busy);
show_store_gov_pol_sys(max_freq_hysteresis);
show_store_gov_pol_sys(align_windows);
show_store_gov_pol_sys(powersave_bias);
#define gov_sys_attr_rw(_name) \
static struct global_attr _name##_gov_sys = \
__ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys)
#define gov_pol_attr_rw(_name) \
static struct freq_attr _name##_gov_pol = \
__ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol)
#define gov_sys_pol_attr_rw(_name) \
gov_sys_attr_rw(_name); \
gov_pol_attr_rw(_name)
gov_sys_pol_attr_rw(target_loads);
gov_sys_pol_attr_rw(above_hispeed_delay);
gov_sys_pol_attr_rw(hispeed_freq);
gov_sys_pol_attr_rw(go_hispeed_load);
gov_sys_pol_attr_rw(min_sample_time);
gov_sys_pol_attr_rw(timer_rate);
gov_sys_pol_attr_rw(timer_slack);
gov_sys_pol_attr_rw(io_is_busy);
gov_sys_pol_attr_rw(max_freq_hysteresis);
gov_sys_pol_attr_rw(align_windows);
gov_sys_pol_attr_rw(powersave_bias);
/* One Governor instance for entire system */
static struct attribute *impulse_attributes_gov_sys[] = {
&target_loads_gov_sys.attr,
&above_hispeed_delay_gov_sys.attr,
&hispeed_freq_gov_sys.attr,
&go_hispeed_load_gov_sys.attr,
&min_sample_time_gov_sys.attr,
&timer_rate_gov_sys.attr,
&timer_slack_gov_sys.attr,
&io_is_busy_gov_sys.attr,
&max_freq_hysteresis_gov_sys.attr,
&align_windows_gov_sys.attr,
&powersave_bias_gov_sys.attr,
NULL,
};
static struct attribute_group impulse_attr_group_gov_sys = {
.attrs = impulse_attributes_gov_sys,
.name = "impulse",
};
/* Per policy governor instance */
static struct attribute *impulse_attributes_gov_pol[] = {
&target_loads_gov_pol.attr,
&above_hispeed_delay_gov_pol.attr,
&hispeed_freq_gov_pol.attr,
&go_hispeed_load_gov_pol.attr,
&min_sample_time_gov_pol.attr,
&timer_rate_gov_pol.attr,
&timer_slack_gov_pol.attr,
&io_is_busy_gov_pol.attr,
&max_freq_hysteresis_gov_pol.attr,
&align_windows_gov_pol.attr,
&powersave_bias_gov_pol.attr,
NULL,
};
static struct attribute_group impulse_attr_group_gov_pol = {
.attrs = impulse_attributes_gov_pol,
.name = "impulse",
};
static struct attribute_group *get_sysfs_attr(void)
{
if (have_governor_per_policy())
return &impulse_attr_group_gov_pol;
else
return &impulse_attr_group_gov_sys;
}
static void cpufreq_impulse_nop_timer(unsigned long data)
{
}
static struct cpufreq_impulse_tunables *alloc_tunable(
struct cpufreq_policy *policy)
{
struct cpufreq_impulse_tunables *tunables;
tunables = kzalloc(sizeof(*tunables), GFP_KERNEL);
if (!tunables)
return ERR_PTR(-ENOMEM);
tunables->above_hispeed_delay = default_above_hispeed_delay;
tunables->nabove_hispeed_delay =
ARRAY_SIZE(default_above_hispeed_delay);
tunables->go_hispeed_load = DEFAULT_GO_HISPEED_LOAD;
tunables->target_loads = default_target_loads;
tunables->ntarget_loads = ARRAY_SIZE(default_target_loads);
tunables->min_sample_time = DEFAULT_MIN_SAMPLE_TIME;
tunables->timer_rate = DEFAULT_TIMER_RATE;
#ifdef CONFIG_STATE_NOTIFIER
tunables->timer_rate_prev = DEFAULT_TIMER_RATE;
#endif
tunables->timer_slack_val = DEFAULT_TIMER_SLACK;
spin_lock_init(&tunables->target_loads_lock);
spin_lock_init(&tunables->above_hispeed_delay_lock);
return tunables;
}
static struct cpufreq_impulse_policyinfo *get_policyinfo(
struct cpufreq_policy *policy)
{
struct cpufreq_impulse_policyinfo *ppol =
per_cpu(polinfo, policy->cpu);
int i;
unsigned long *busy;
/* polinfo already allocated for policy, return */
if (ppol)
return ppol;
ppol = kzalloc(sizeof(*ppol), GFP_KERNEL);
if (!ppol)
return ERR_PTR(-ENOMEM);
busy = kcalloc(cpumask_weight(policy->related_cpus), sizeof(*busy),
GFP_KERNEL);
if (!busy) {
kfree(ppol);
return ERR_PTR(-ENOMEM);
}
ppol->cpu_busy_times = busy;
init_timer_deferrable(&ppol->policy_timer);
ppol->policy_timer.function = cpufreq_impulse_timer;
init_timer(&ppol->policy_slack_timer);
ppol->policy_slack_timer.function = cpufreq_impulse_nop_timer;
spin_lock_init(&ppol->load_lock);
spin_lock_init(&ppol->target_freq_lock);
init_rwsem(&ppol->enable_sem);
for_each_cpu(i, policy->related_cpus)
per_cpu(polinfo, i) = ppol;
return ppol;
}
/* This function is not multithread-safe. */
static void free_policyinfo(int cpu)
{
struct cpufreq_impulse_policyinfo *ppol = per_cpu(polinfo, cpu);
int j;
if (!ppol)
return;
for_each_possible_cpu(j)
if (per_cpu(polinfo, j) == ppol)
per_cpu(polinfo, cpu) = NULL;
kfree(ppol->cached_tunables);
kfree(ppol->cpu_busy_times);
kfree(ppol);
}
static struct cpufreq_impulse_tunables *get_tunables(
struct cpufreq_impulse_policyinfo *ppol)
{
if (have_governor_per_policy())
return ppol->cached_tunables;
else
return cached_common_tunables;
}
static int cpufreq_governor_impulse(struct cpufreq_policy *policy,
unsigned int event)
{
int rc;
struct cpufreq_impulse_policyinfo *ppol;
struct cpufreq_frequency_table *freq_table;
struct cpufreq_impulse_tunables *tunables;
unsigned long flags;
if (have_governor_per_policy())
tunables = policy->governor_data;
else
tunables = common_tunables;
BUG_ON(!tunables && (event != CPUFREQ_GOV_POLICY_INIT));
switch (event) {
case CPUFREQ_GOV_POLICY_INIT:
ppol = get_policyinfo(policy);
if (IS_ERR(ppol))
return PTR_ERR(ppol);
if (have_governor_per_policy()) {
WARN_ON(tunables);
} else if (tunables) {
tunables->usage_count++;
policy->governor_data = tunables;
return 0;
}
tunables = get_tunables(ppol);
if (!tunables) {
tunables = alloc_tunable(policy);
if (IS_ERR(tunables))
return PTR_ERR(tunables);
}
tunables->usage_count = 1;
policy->governor_data = tunables;
if (!have_governor_per_policy()) {
common_tunables = tunables;
}
rc = sysfs_create_group(get_governor_parent_kobj(policy),
get_sysfs_attr());
if (rc) {
kfree(tunables);
policy->governor_data = NULL;
if (!have_governor_per_policy()) {
common_tunables = NULL;
}
return rc;
}
if (!policy->governor->initialized)
cpufreq_register_notifier(&cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
if (have_governor_per_policy())
ppol->cached_tunables = tunables;
else
cached_common_tunables = tunables;
break;
case CPUFREQ_GOV_POLICY_EXIT:
if (!--tunables->usage_count) {
if (policy->governor->initialized == 1)
cpufreq_unregister_notifier(&cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
sysfs_remove_group(get_governor_parent_kobj(policy),
get_sysfs_attr());
if (!have_governor_per_policy())
common_tunables = NULL;
}
policy->governor_data = NULL;
break;
case CPUFREQ_GOV_START:
mutex_lock(&gov_lock);
freq_table = cpufreq_frequency_get_table(policy->cpu);
if (!tunables->hispeed_freq)
tunables->hispeed_freq = policy->max;
ppol = per_cpu(polinfo, policy->cpu);
ppol->policy = policy;
ppol->target_freq = policy->cur;
ppol->freq_table = freq_table;
ppol->floor_freq = ppol->target_freq;
ppol->floor_validate_time = ktime_to_us(ktime_get());
ppol->hispeed_validate_time = ppol->floor_validate_time;
ppol->min_freq = policy->min;
ppol->reject_notification = true;
down_write(&ppol->enable_sem);
del_timer_sync(&ppol->policy_timer);
del_timer_sync(&ppol->policy_slack_timer);
ppol->policy_timer.data = policy->cpu;
ppol->last_evaluated_jiffy = get_jiffies_64();
if (cpu_online(policy->cpu))
cpufreq_impulse_timer_start(tunables, policy->cpu);
ppol->governor_enabled = 1;
up_write(&ppol->enable_sem);
ppol->reject_notification = false;
mutex_unlock(&gov_lock);
break;
case CPUFREQ_GOV_STOP:
mutex_lock(&gov_lock);
ppol = per_cpu(polinfo, policy->cpu);
ppol->reject_notification = true;
down_write(&ppol->enable_sem);
ppol->governor_enabled = 0;
ppol->target_freq = 0;
del_timer_sync(&ppol->policy_timer);
del_timer_sync(&ppol->policy_slack_timer);
up_write(&ppol->enable_sem);
ppol->reject_notification = false;
mutex_unlock(&gov_lock);
break;
case CPUFREQ_GOV_LIMITS:
__cpufreq_driver_target(policy,
policy->cur, CPUFREQ_RELATION_L);
ppol = per_cpu(polinfo, policy->cpu);
down_read(&ppol->enable_sem);
if (ppol->governor_enabled) {
spin_lock_irqsave(&ppol->target_freq_lock, flags);
if (policy->max < ppol->target_freq)
ppol->target_freq = policy->max;
else if (policy->min >= ppol->target_freq)
ppol->target_freq = policy->min;
spin_unlock_irqrestore(&ppol->target_freq_lock, flags);
if (policy->min < ppol->min_freq)
cpufreq_impulse_timer_resched(policy->cpu,
true);
ppol->min_freq = policy->min;
}
up_read(&ppol->enable_sem);
break;
}
return 0;
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_IMPULSE
static
#endif
struct cpufreq_governor cpufreq_gov_impulse = {
.name = "impulse",
.governor = cpufreq_governor_impulse,
.max_transition_latency = 10000000,
.owner = THIS_MODULE,
};
static int __init cpufreq_impulse_init(void)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
spin_lock_init(&speedchange_cpumask_lock);
mutex_init(&gov_lock);
speedchange_task =
kthread_create(cpufreq_impulse_speedchange_task, NULL,
"cfimpulse");
if (IS_ERR(speedchange_task))
return PTR_ERR(speedchange_task);
sched_setscheduler_nocheck(speedchange_task, SCHED_FIFO, &param);
get_task_struct(speedchange_task);
/* NB: wake up so the thread does not look hung to the freezer */
wake_up_process(speedchange_task);
return cpufreq_register_governor(&cpufreq_gov_impulse);
}
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_IMPULSE
fs_initcall(cpufreq_impulse_init);
#else
module_init(cpufreq_impulse_init);
#endif
static void __exit cpufreq_impulse_exit(void)
{
int cpu;
cpufreq_unregister_governor(&cpufreq_gov_impulse);
kthread_stop(speedchange_task);
put_task_struct(speedchange_task);
for_each_possible_cpu(cpu)
free_policyinfo(cpu);
}
module_exit(cpufreq_impulse_exit);
MODULE_AUTHOR("Pranav Vashi <neobuddy89@gmail.com>");
MODULE_DESCRIPTION("'cpufreq_impulse' - A cpufreq governor for "
"Latency sensitive workloads");
MODULE_LICENSE("GPLv2");
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