cpufreq_ondemand.c

/*
 *  drivers/cpufreq/cpufreq_ondemand.c
 *
 *  Copyright (C)  2001 Russell King
 *            (C)  2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
 *                      Jun Nakajima <jun.nakajima@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/cpu.h>
#include <linux/percpu-defs.h>
#include <linux/slab.h>
#include <linux/tick.h>
#include "cpufreq_governor.h"

/* On-demand governor macros */
#define DEF_FREQUENCY_UP_THRESHOLD		(80)
#define DEF_SAMPLING_DOWN_FACTOR		(1)
#define MAX_SAMPLING_DOWN_FACTOR		(100000)
#define MICRO_FREQUENCY_UP_THRESHOLD		(95)
#define MICRO_FREQUENCY_MIN_SAMPLE_RATE		(10000)
#define MIN_FREQUENCY_UP_THRESHOLD		(11)
#define MAX_FREQUENCY_UP_THRESHOLD		(100)

static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info);

static struct od_ops od_ops;

static unsigned int default_powersave_bias;

static void ondemand_powersave_bias_init_cpu(int cpu)
{
	struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);

	dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
	dbs_info->freq_lo = 0;
}

/*
 * Not all CPUs want IO time to be accounted as busy; this depends on how
 * efficient idling at a higher frequency/voltage is.
 * Pavel Machek says this is not so for various generations of AMD and old
 * Intel systems.
 * Mike Chan (android.com) claims this is also not true for ARM.
 * Because of this, whitelist specific known (series) of CPUs by default, and
 * leave all others up to the user.
 */
static int should_io_be_busy(void)
{
#if defined(CONFIG_X86)
	/*
	 * For Intel, Core 2 (model 15) and later have an efficient idle.
	 */
	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
			boot_cpu_data.x86 == 6 &&
			boot_cpu_data.x86_model >= 15)
		return 1;
#endif
	return 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 generic_powersave_bias_target(struct cpufreq_policy *policy,
		unsigned int freq_next, unsigned int relation)
{
	unsigned int freq_req, freq_reduc, freq_avg;
	unsigned int freq_hi, freq_lo;
	unsigned int index = 0;
	unsigned int jiffies_total, jiffies_hi, jiffies_lo;
	struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
						   policy->cpu);
	struct policy_dbs_info *policy_dbs = policy->governor_data;
	struct dbs_data *dbs_data = policy_dbs->dbs_data;
	struct od_dbs_tuners *od_tuners = dbs_data->tuners;

	if (!dbs_info->freq_table) {
		dbs_info->freq_lo = 0;
		dbs_info->freq_lo_jiffies = 0;
		return freq_next;
	}

	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next,
			relation, &index);
	freq_req = dbs_info->freq_table[index].frequency;
	freq_reduc = freq_req * od_tuners->powersave_bias / 1000;
	freq_avg = freq_req - freq_reduc;

	/* Find freq bounds for freq_avg in freq_table */
	index = 0;
	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
			CPUFREQ_RELATION_H, &index);
	freq_lo = dbs_info->freq_table[index].frequency;
	index = 0;
	cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
			CPUFREQ_RELATION_L, &index);
	freq_hi = dbs_info->freq_table[index].frequency;

	/* Find out how long we have to be in hi and lo freqs */
	if (freq_hi == freq_lo) {
		dbs_info->freq_lo = 0;
		dbs_info->freq_lo_jiffies = 0;
		return freq_lo;
	}
	jiffies_total = usecs_to_jiffies(dbs_data->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 ondemand_powersave_bias_init(void)
{
	int i;
	for_each_online_cpu(i) {
		ondemand_powersave_bias_init_cpu(i);
	}
}

static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq)
{
	struct policy_dbs_info *policy_dbs = policy->governor_data;
	struct dbs_data *dbs_data = policy_dbs->dbs_data;
	struct od_dbs_tuners *od_tuners = dbs_data->tuners;

	if (od_tuners->powersave_bias)
		freq = od_ops.powersave_bias_target(policy, freq,
				CPUFREQ_RELATION_H);
	else if (policy->cur == policy->max)
		return;

	__cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ?
			CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
}

/*
 * Every sampling_rate, we check, if current idle time is less than 20%
 * (default), then we try to increase frequency. Else, we adjust the frequency
 * proportional to load.
 */
static void od_check_cpu(int cpu, unsigned int load)
{
	struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
	struct policy_dbs_info *policy_dbs = dbs_info->cdbs.policy_dbs;
	struct cpufreq_policy *policy = policy_dbs->policy;
	struct dbs_data *dbs_data = policy_dbs->dbs_data;
	struct od_dbs_tuners *od_tuners = dbs_data->tuners;

	dbs_info->freq_lo = 0;

	/* Check for frequency increase */
	if (load > dbs_data->up_threshold) {
		/* If switching to max speed, apply sampling_down_factor */
		if (policy->cur < policy->max)
			dbs_info->rate_mult = dbs_data->sampling_down_factor;
		dbs_freq_increase(policy, policy->max);
	} else {
		/* Calculate the next frequency proportional to load */
		unsigned int freq_next, min_f, max_f;

		min_f = policy->cpuinfo.min_freq;
		max_f = policy->cpuinfo.max_freq;
		freq_next = min_f + load * (max_f - min_f) / 100;

		/* No longer fully busy, reset rate_mult */
		dbs_info->rate_mult = 1;

		if (!od_tuners->powersave_bias) {
			__cpufreq_driver_target(policy, freq_next,
					CPUFREQ_RELATION_C);
			return;
		}

		freq_next = od_ops.powersave_bias_target(policy, freq_next,
					CPUFREQ_RELATION_L);
		__cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C);
	}
}

static unsigned int od_dbs_timer(struct cpufreq_policy *policy)
{
	struct policy_dbs_info *policy_dbs = policy->governor_data;
	struct dbs_data *dbs_data = policy_dbs->dbs_data;
	struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu);
	int delay = 0, sample_type = dbs_info->sample_type;

	/* Common NORMAL_SAMPLE setup */
	dbs_info->sample_type = OD_NORMAL_SAMPLE;
	if (sample_type == OD_SUB_SAMPLE) {
		delay = dbs_info->freq_lo_jiffies;
		__cpufreq_driver_target(policy, dbs_info->freq_lo,
					CPUFREQ_RELATION_H);
	} else {
		dbs_check_cpu(policy);
		if (dbs_info->freq_lo) {
			/* Setup timer for SUB_SAMPLE */
			dbs_info->sample_type = OD_SUB_SAMPLE;
			delay = dbs_info->freq_hi_jiffies;
		}
	}

	if (!delay)
		delay = delay_for_sampling_rate(dbs_data->sampling_rate
				* dbs_info->rate_mult);

	return delay;
}

/************************** sysfs interface ************************/
static struct dbs_governor od_dbs_gov;

/**
 * update_sampling_rate - update sampling rate effective immediately if needed.
 * @new_rate: new sampling rate
 *
 * If new rate is smaller than the old, simply updating
 * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the
 * original sampling_rate was 1 second and the requested new sampling rate is 10
 * ms because the user needs immediate reaction from ondemand governor, but not
 * sure if higher frequency will be required or not, then, the governor may
 * change the sampling rate too late; up to 1 second later. Thus, if we are
 * reducing the sampling rate, we need to make the new value effective
 * immediately.
 */
static void update_sampling_rate(struct dbs_data *dbs_data,
		unsigned int new_rate)
{
	struct cpumask cpumask;
	int cpu;

	dbs_data->sampling_rate = new_rate = max(new_rate,
			dbs_data->min_sampling_rate);

	/*
	 * Lock governor so that governor start/stop can't execute in parallel.
	 */
	mutex_lock(&dbs_data_mutex);

	cpumask_copy(&cpumask, cpu_online_mask);

	for_each_cpu(cpu, &cpumask) {
		struct cpufreq_policy *policy;
		struct od_cpu_dbs_info_s *dbs_info;
		struct cpu_dbs_info *cdbs;
		struct policy_dbs_info *policy_dbs;

		dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
		cdbs = &dbs_info->cdbs;
		policy_dbs = cdbs->policy_dbs;

		/*
		 * A valid policy_dbs and policy_dbs->policy means governor
		 * hasn't stopped or exited yet.
		 */
		if (!policy_dbs || !policy_dbs->policy)
			continue;

		policy = policy_dbs->policy;

		/* clear all CPUs of this policy */
		cpumask_andnot(&cpumask, &cpumask, policy->cpus);

		/*
		 * Update sampling rate for CPUs whose policy is governed by
		 * dbs_data. In case of governor_per_policy, only a single
		 * policy will be governed by dbs_data, otherwise there can be
		 * multiple policies that are governed by the same dbs_data.
		 */
		if (dbs_data == policy_dbs->dbs_data) {
			mutex_lock(&policy_dbs->timer_mutex);
			/*
			 * On 32-bit architectures this may race with the
			 * sample_delay_ns read in dbs_update_util_handler(),
			 * but that really doesn't matter.  If the read returns
			 * a value that's too big, the sample will be skipped,
			 * but the next invocation of dbs_update_util_handler()
			 * (when the update has been completed) will take a
			 * sample.  If the returned value is too small, the
			 * sample will be taken immediately, but that isn't a
			 * problem, as we want the new rate to take effect
			 * immediately anyway.
			 *
			 * If this runs in parallel with dbs_work_handler(), we
			 * may end up overwriting the sample_delay_ns value that
			 * it has just written, but the difference should not be
			 * too big and it will be corrected next time a sample
			 * is taken, so it shouldn't be significant.
			 */
			gov_update_sample_delay(policy_dbs, new_rate);
			mutex_unlock(&policy_dbs->timer_mutex);
		}
	}

	mutex_unlock(&dbs_data_mutex);
}

static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
		size_t count)
{
	unsigned int input;
	int ret;
	ret = sscanf(buf, "%u", &input);
	if (ret != 1)
		return -EINVAL;

	update_sampling_rate(dbs_data, input);
	return count;
}

static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf,
		size_t count)
{
	struct od_dbs_tuners *od_tuners = dbs_data->tuners;
	unsigned int input;
	int ret;
	unsigned int j;

	ret = sscanf(buf, "%u", &input);
	if (ret != 1)
		return -EINVAL;
	od_tuners->io_is_busy = !!input;

	/* we need to re-evaluate prev_cpu_idle */
	for_each_online_cpu(j) {
		struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
									j);
		dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
			&dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
	}
	return count;
}

static ssize_t store_up_threshold(struct dbs_data *dbs_data, 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_data->up_threshold = input;
	return count;
}

static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data,
		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_data->sampling_down_factor = input;

	/* Reset down sampling multiplier in case it was active */
	for_each_online_cpu(j) {
		struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
				j);
		dbs_info->rate_mult = 1;
	}
	return count;
}

static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data,
		const char *buf, size_t count)
{
	struct od_dbs_tuners *od_tuners = dbs_data->tuners;
	unsigned int input;
	int ret;

	unsigned int j;

	ret = sscanf(buf, "%u", &input);
	if (ret != 1)
		return -EINVAL;

	if (input > 1)
		input = 1;

	if (input == dbs_data->ignore_nice_load) { /* nothing to do */
		return count;
	}
	dbs_data->ignore_nice_load = input;

	/* we need to re-evaluate prev_cpu_idle */
	for_each_online_cpu(j) {
		struct od_cpu_dbs_info_s *dbs_info;
		dbs_info = &per_cpu(od_cpu_dbs_info, j);
		dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
			&dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
		if (dbs_data->ignore_nice_load)
			dbs_info->cdbs.prev_cpu_nice =
				kcpustat_cpu(j).cpustat[CPUTIME_NICE];

	}
	return count;
}

static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf,
		size_t count)
{
	struct od_dbs_tuners *od_tuners = dbs_data->tuners;
	unsigned int input;
	int ret;
	ret = sscanf(buf, "%u", &input);

	if (ret != 1)
		return -EINVAL;

	if (input > 1000)
		input = 1000;

	od_tuners->powersave_bias = input;
	ondemand_powersave_bias_init();
	return count;
}

show_store_one(od, io_is_busy);
show_store_one(od, powersave_bias);
show_store_one_common(od, sampling_rate);
show_store_one_common(od, up_threshold);
show_store_one_common(od, sampling_down_factor);
show_store_one_common(od, ignore_nice_load);
show_one_common(od, min_sampling_rate);

gov_sys_pol_attr_rw(sampling_rate);
gov_sys_pol_attr_rw(io_is_busy);
gov_sys_pol_attr_rw(up_threshold);
gov_sys_pol_attr_rw(sampling_down_factor);
gov_sys_pol_attr_rw(ignore_nice_load);
gov_sys_pol_attr_rw(powersave_bias);
gov_sys_pol_attr_ro(min_sampling_rate);

static struct attribute *dbs_attributes_gov_sys[] = {
	&min_sampling_rate_gov_sys.attr,
	&sampling_rate_gov_sys.attr,
	&up_threshold_gov_sys.attr,
	&sampling_down_factor_gov_sys.attr,
	&ignore_nice_load_gov_sys.attr,
	&powersave_bias_gov_sys.attr,
	&io_is_busy_gov_sys.attr,
	NULL
};

static struct attribute_group od_attr_group_gov_sys = {
	.attrs = dbs_attributes_gov_sys,
	.name = "ondemand",
};

static struct attribute *dbs_attributes_gov_pol[] = {
	&min_sampling_rate_gov_pol.attr,
	&sampling_rate_gov_pol.attr,
	&up_threshold_gov_pol.attr,
	&sampling_down_factor_gov_pol.attr,
	&ignore_nice_load_gov_pol.attr,
	&powersave_bias_gov_pol.attr,
	&io_is_busy_gov_pol.attr,
	NULL
};

static struct attribute_group od_attr_group_gov_pol = {
	.attrs = dbs_attributes_gov_pol,
	.name = "ondemand",
};

/************************** sysfs end ************************/

static int od_init(struct dbs_data *dbs_data, bool notify)
{
	struct od_dbs_tuners *tuners;
	u64 idle_time;
	int cpu;

	tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
	if (!tuners) {
		pr_err("%s: kzalloc failed\n", __func__);
		return -ENOMEM;
	}

	cpu = get_cpu();
	idle_time = get_cpu_idle_time_us(cpu, NULL);
	put_cpu();
	if (idle_time != -1ULL) {
		/* Idle micro accounting is supported. Use finer thresholds */
		dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
		/*
		 * In nohz/micro accounting case we set the minimum frequency
		 * not depending on HZ, but fixed (very low). The deferred
		 * timer might skip some samples if idle/sleeping as needed.
		*/
		dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
	} else {
		dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;

		/* For correct statistics, we need 10 ticks for each measure */
		dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
			jiffies_to_usecs(10);
	}

	dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
	dbs_data->ignore_nice_load = 0;
	tuners->powersave_bias = default_powersave_bias;
	tuners->io_is_busy = should_io_be_busy();

	dbs_data->tuners = tuners;
	return 0;
}

static void od_exit(struct dbs_data *dbs_data, bool notify)
{
	kfree(dbs_data->tuners);
}

define_get_cpu_dbs_routines(od_cpu_dbs_info);

static struct od_ops od_ops = {
	.powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu,
	.powersave_bias_target = generic_powersave_bias_target,
	.freq_increase = dbs_freq_increase,
};

static struct dbs_governor od_dbs_gov = {
	.gov = {
		.name = "ondemand",
		.governor = cpufreq_governor_dbs,
		.max_transition_latency	= TRANSITION_LATENCY_LIMIT,
		.owner = THIS_MODULE,
	},
	.governor = GOV_ONDEMAND,
	.attr_group_gov_sys = &od_attr_group_gov_sys,
	.attr_group_gov_pol = &od_attr_group_gov_pol,
	.get_cpu_cdbs = get_cpu_cdbs,
	.get_cpu_dbs_info_s = get_cpu_dbs_info_s,
	.gov_dbs_timer = od_dbs_timer,
	.gov_check_cpu = od_check_cpu,
	.gov_ops = &od_ops,
	.init = od_init,
	.exit = od_exit,
};

#define CPU_FREQ_GOV_ONDEMAND	(&od_dbs_gov.gov)

static void od_set_powersave_bias(unsigned int powersave_bias)
{
	struct cpufreq_policy *policy;
	struct dbs_data *dbs_data;
	struct od_dbs_tuners *od_tuners;
	unsigned int cpu;
	cpumask_t done;

	default_powersave_bias = powersave_bias;
	cpumask_clear(&done);

	get_online_cpus();
	for_each_online_cpu(cpu) {
		struct policy_dbs_info *policy_dbs;

		if (cpumask_test_cpu(cpu, &done))
			continue;

		policy_dbs = per_cpu(od_cpu_dbs_info, cpu).cdbs.policy_dbs;
		if (!policy_dbs)
			continue;

		policy = policy_dbs->policy;
		cpumask_or(&done, &done, policy->cpus);

		if (policy->governor != CPU_FREQ_GOV_ONDEMAND)
			continue;

		dbs_data = policy_dbs->dbs_data;
		od_tuners = dbs_data->tuners;
		od_tuners->powersave_bias = default_powersave_bias;
	}
	put_online_cpus();
}

void od_register_powersave_bias_handler(unsigned int (*f)
		(struct cpufreq_policy *, unsigned int, unsigned int),
		unsigned int powersave_bias)
{
	od_ops.powersave_bias_target = f;
	od_set_powersave_bias(powersave_bias);
}
EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler);

void od_unregister_powersave_bias_handler(void)
{
	od_ops.powersave_bias_target = generic_powersave_bias_target;
	od_set_powersave_bias(0);
}
EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);

static int __init cpufreq_gov_dbs_init(void)
{
	return cpufreq_register_governor(CPU_FREQ_GOV_ONDEMAND);
}

static void __exit cpufreq_gov_dbs_exit(void)
{
	cpufreq_unregister_governor(CPU_FREQ_GOV_ONDEMAND);
}

MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for "
	"Low Latency Frequency Transition capable processors");
MODULE_LICENSE("GPL");

#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
struct cpufreq_governor *cpufreq_default_governor(void)
{
	return CPU_FREQ_GOV_ONDEMAND;
}

fs_initcall(cpufreq_gov_dbs_init);
#else
module_init(cpufreq_gov_dbs_init);
#endif
module_exit(cpufreq_gov_dbs_exit);