[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/cpufreq/cpufreq_ondemand.c b/src/kernel/linux/v4.14/drivers/cpufreq/cpufreq_ondemand.c
new file mode 100644
index 0000000..6b423ee
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/cpufreq/cpufreq_ondemand.c
@@ -0,0 +1,493 @@
+/*
+ * 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 <linux/sched/cpufreq.h>
+
+#include "cpufreq_ondemand.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 (1)
+#define MAX_FREQUENCY_UP_THRESHOLD (100)
+
+static struct od_ops od_ops;
+
+static unsigned int default_powersave_bias;
+
+/*
+ * 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_delay_us,
+ * freq_lo, and freq_lo_delay_us 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;
+ unsigned int delay_hi_us;
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
+ struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
+ struct dbs_data *dbs_data = policy_dbs->dbs_data;
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ struct cpufreq_frequency_table *freq_table = policy->freq_table;
+
+ if (!freq_table) {
+ dbs_info->freq_lo = 0;
+ dbs_info->freq_lo_delay_us = 0;
+ return freq_next;
+ }
+
+ index = cpufreq_frequency_table_target(policy, freq_next, relation);
+ freq_req = 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 = cpufreq_table_find_index_h(policy, freq_avg);
+ freq_lo = freq_table[index].frequency;
+ index = cpufreq_table_find_index_l(policy, freq_avg);
+ freq_hi = 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_delay_us = 0;
+ return freq_lo;
+ }
+ delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate;
+ delay_hi_us += (freq_hi - freq_lo) / 2;
+ delay_hi_us /= freq_hi - freq_lo;
+ dbs_info->freq_hi_delay_us = delay_hi_us;
+ dbs_info->freq_lo = freq_lo;
+ dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us;
+ return freq_hi;
+}
+
+static void ondemand_powersave_bias_init(struct cpufreq_policy *policy)
+{
+ struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
+
+ dbs_info->freq_lo = 0;
+}
+
+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_update(struct cpufreq_policy *policy)
+{
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
+ struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
+ struct dbs_data *dbs_data = policy_dbs->dbs_data;
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ unsigned int load = dbs_update(policy);
+
+ 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)
+ policy_dbs->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 */
+ policy_dbs->rate_mult = 1;
+
+ if (od_tuners->powersave_bias)
+ 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_update(struct cpufreq_policy *policy)
+{
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
+ struct dbs_data *dbs_data = policy_dbs->dbs_data;
+ struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
+ int sample_type = dbs_info->sample_type;
+
+ /* Common NORMAL_SAMPLE setup */
+ dbs_info->sample_type = OD_NORMAL_SAMPLE;
+ /*
+ * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore
+ * it then.
+ */
+ if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) {
+ __cpufreq_driver_target(policy, dbs_info->freq_lo,
+ CPUFREQ_RELATION_H);
+ return dbs_info->freq_lo_delay_us;
+ }
+
+ od_update(policy);
+
+ if (dbs_info->freq_lo) {
+ /* Setup SUB_SAMPLE */
+ dbs_info->sample_type = OD_SUB_SAMPLE;
+ return dbs_info->freq_hi_delay_us;
+ }
+
+ return dbs_data->sampling_rate * policy_dbs->rate_mult;
+}
+
+/************************** sysfs interface ************************/
+static struct dbs_governor od_dbs_gov;
+
+static ssize_t store_io_is_busy(struct gov_attr_set *attr_set, const char *buf,
+ size_t count)
+{
+ struct dbs_data *dbs_data = to_dbs_data(attr_set);
+ unsigned int input;
+ int ret;
+
+ ret = sscanf(buf, "%u", &input);
+ if (ret != 1)
+ return -EINVAL;
+ dbs_data->io_is_busy = !!input;
+
+ /* we need to re-evaluate prev_cpu_idle */
+ gov_update_cpu_data(dbs_data);
+
+ return count;
+}
+
+static ssize_t store_up_threshold(struct gov_attr_set *attr_set,
+ const char *buf, size_t count)
+{
+ struct dbs_data *dbs_data = to_dbs_data(attr_set);
+ 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 gov_attr_set *attr_set,
+ const char *buf, size_t count)
+{
+ struct dbs_data *dbs_data = to_dbs_data(attr_set);
+ struct policy_dbs_info *policy_dbs;
+ unsigned int input;
+ 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 */
+ list_for_each_entry(policy_dbs, &attr_set->policy_list, list) {
+ /*
+ * Doing this without locking might lead to using different
+ * rate_mult values in od_update() and od_dbs_update().
+ */
+ mutex_lock(&policy_dbs->update_mutex);
+ policy_dbs->rate_mult = 1;
+ mutex_unlock(&policy_dbs->update_mutex);
+ }
+
+ return count;
+}
+
+static ssize_t store_ignore_nice_load(struct gov_attr_set *attr_set,
+ const char *buf, size_t count)
+{
+ struct dbs_data *dbs_data = to_dbs_data(attr_set);
+ unsigned int input;
+ int ret;
+
+ 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 */
+ gov_update_cpu_data(dbs_data);
+
+ return count;
+}
+
+static ssize_t store_powersave_bias(struct gov_attr_set *attr_set,
+ const char *buf, size_t count)
+{
+ struct dbs_data *dbs_data = to_dbs_data(attr_set);
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ struct policy_dbs_info *policy_dbs;
+ 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;
+
+ list_for_each_entry(policy_dbs, &attr_set->policy_list, list)
+ ondemand_powersave_bias_init(policy_dbs->policy);
+
+ return count;
+}
+
+gov_show_one_common(sampling_rate);
+gov_show_one_common(up_threshold);
+gov_show_one_common(sampling_down_factor);
+gov_show_one_common(ignore_nice_load);
+gov_show_one_common(io_is_busy);
+gov_show_one(od, powersave_bias);
+
+gov_attr_rw(sampling_rate);
+gov_attr_rw(io_is_busy);
+gov_attr_rw(up_threshold);
+gov_attr_rw(sampling_down_factor);
+gov_attr_rw(ignore_nice_load);
+gov_attr_rw(powersave_bias);
+
+static struct attribute *od_attributes[] = {
+ &sampling_rate.attr,
+ &up_threshold.attr,
+ &sampling_down_factor.attr,
+ &ignore_nice_load.attr,
+ &powersave_bias.attr,
+ &io_is_busy.attr,
+ NULL
+};
+
+/************************** sysfs end ************************/
+
+static struct policy_dbs_info *od_alloc(void)
+{
+ struct od_policy_dbs_info *dbs_info;
+
+ dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL);
+ return dbs_info ? &dbs_info->policy_dbs : NULL;
+}
+
+static void od_free(struct policy_dbs_info *policy_dbs)
+{
+ kfree(to_dbs_info(policy_dbs));
+}
+
+static int od_init(struct dbs_data *dbs_data)
+{
+ struct od_dbs_tuners *tuners;
+ u64 idle_time;
+ int cpu;
+
+ tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
+ if (!tuners)
+ 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;
+ } else {
+ dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
+ }
+
+ dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
+ dbs_data->ignore_nice_load = 0;
+ tuners->powersave_bias = default_powersave_bias;
+ dbs_data->io_is_busy = should_io_be_busy();
+
+ dbs_data->tuners = tuners;
+ return 0;
+}
+
+static void od_exit(struct dbs_data *dbs_data)
+{
+ kfree(dbs_data->tuners);
+}
+
+static void od_start(struct cpufreq_policy *policy)
+{
+ struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
+
+ dbs_info->sample_type = OD_NORMAL_SAMPLE;
+ ondemand_powersave_bias_init(policy);
+}
+
+static struct od_ops od_ops = {
+ .powersave_bias_target = generic_powersave_bias_target,
+};
+
+static struct dbs_governor od_dbs_gov = {
+ .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("ondemand"),
+ .kobj_type = { .default_attrs = od_attributes },
+ .gov_dbs_update = od_dbs_update,
+ .alloc = od_alloc,
+ .free = od_free,
+ .init = od_init,
+ .exit = od_exit,
+ .start = od_start,
+};
+
+#define CPU_FREQ_GOV_ONDEMAND (&od_dbs_gov.gov)
+
+static void od_set_powersave_bias(unsigned int powersave_bias)
+{
+ unsigned int cpu;
+ cpumask_t done;
+
+ default_powersave_bias = powersave_bias;
+ cpumask_clear(&done);
+
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ struct cpufreq_policy *policy;
+ struct policy_dbs_info *policy_dbs;
+ struct dbs_data *dbs_data;
+ struct od_dbs_tuners *od_tuners;
+
+ if (cpumask_test_cpu(cpu, &done))
+ continue;
+
+ policy = cpufreq_cpu_get_raw(cpu);
+ if (!policy || policy->governor != CPU_FREQ_GOV_ONDEMAND)
+ continue;
+
+ policy_dbs = policy->governor_data;
+ if (!policy_dbs)
+ continue;
+
+ cpumask_or(&done, &done, policy->cpus);
+
+ 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);