[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/cpufreq/cpufreq_conservative.c b/src/kernel/linux/v4.14/drivers/cpufreq/cpufreq_conservative.c
new file mode 100644
index 0000000..4268f87
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/cpufreq/cpufreq_conservative.c
@@ -0,0 +1,356 @@
+/*
+ * drivers/cpufreq/cpufreq_conservative.c
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
+ * Jun Nakajima <jun.nakajima@intel.com>
+ * (C) 2009 Alexander Clouter <alex@digriz.org.uk>
+ *
+ * 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/slab.h>
+#include "cpufreq_governor.h"
+
+struct cs_policy_dbs_info {
+ struct policy_dbs_info policy_dbs;
+ unsigned int down_skip;
+ unsigned int requested_freq;
+};
+
+static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs)
+{
+ return container_of(policy_dbs, struct cs_policy_dbs_info, policy_dbs);
+}
+
+struct cs_dbs_tuners {
+ unsigned int down_threshold;
+ unsigned int freq_step;
+};
+
+/* Conservative governor macros */
+#define DEF_FREQUENCY_UP_THRESHOLD (80)
+#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
+#define DEF_FREQUENCY_STEP (5)
+#define DEF_SAMPLING_DOWN_FACTOR (1)
+#define MAX_SAMPLING_DOWN_FACTOR (10)
+
+static inline unsigned int get_freq_step(struct cs_dbs_tuners *cs_tuners,
+ struct cpufreq_policy *policy)
+{
+ unsigned int freq_step = (cs_tuners->freq_step * policy->max) / 100;
+
+ /* max freq cannot be less than 100. But who knows... */
+ if (unlikely(freq_step == 0))
+ freq_step = DEF_FREQUENCY_STEP;
+
+ return freq_step;
+}
+
+/*
+ * Every sampling_rate, we check, if current idle time is less than 20%
+ * (default), then we try to increase frequency. Every sampling_rate *
+ * sampling_down_factor, we check, if current idle time is more than 80%
+ * (default), then we try to decrease frequency
+ *
+ * Frequency updates happen at minimum steps of 5% (default) of maximum
+ * frequency
+ */
+static unsigned int cs_dbs_update(struct cpufreq_policy *policy)
+{
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
+ struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
+ unsigned int requested_freq = dbs_info->requested_freq;
+ struct dbs_data *dbs_data = policy_dbs->dbs_data;
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ unsigned int load = dbs_update(policy);
+ unsigned int freq_step;
+
+ /*
+ * break out if we 'cannot' reduce the speed as the user might
+ * want freq_step to be zero
+ */
+ if (cs_tuners->freq_step == 0)
+ goto out;
+
+ /*
+ * If requested_freq is out of range, it is likely that the limits
+ * changed in the meantime, so fall back to current frequency in that
+ * case.
+ */
+ if (requested_freq > policy->max || requested_freq < policy->min) {
+ requested_freq = policy->cur;
+ dbs_info->requested_freq = requested_freq;
+ }
+
+ freq_step = get_freq_step(cs_tuners, policy);
+
+ /*
+ * Decrease requested_freq one freq_step for each idle period that
+ * we didn't update the frequency.
+ */
+ if (policy_dbs->idle_periods < UINT_MAX) {
+ unsigned int freq_steps = policy_dbs->idle_periods * freq_step;
+
+ if (requested_freq > policy->min + freq_steps)
+ requested_freq -= freq_steps;
+ else
+ requested_freq = policy->min;
+
+ policy_dbs->idle_periods = UINT_MAX;
+ }
+
+ /* Check for frequency increase */
+ if (load > dbs_data->up_threshold) {
+ dbs_info->down_skip = 0;
+
+ /* if we are already at full speed then break out early */
+ if (requested_freq == policy->max)
+ goto out;
+
+ requested_freq += freq_step;
+ if (requested_freq > policy->max)
+ requested_freq = policy->max;
+
+ __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_H);
+ dbs_info->requested_freq = requested_freq;
+ goto out;
+ }
+
+ /* if sampling_down_factor is active break out early */
+ if (++dbs_info->down_skip < dbs_data->sampling_down_factor)
+ goto out;
+ dbs_info->down_skip = 0;
+
+ /* Check for frequency decrease */
+ if (load < cs_tuners->down_threshold) {
+ /*
+ * if we cannot reduce the frequency anymore, break out early
+ */
+ if (requested_freq == policy->min)
+ goto out;
+
+ if (requested_freq > freq_step)
+ requested_freq -= freq_step;
+ else
+ requested_freq = policy->min;
+
+ __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_L);
+ dbs_info->requested_freq = requested_freq;
+ }
+
+ out:
+ return dbs_data->sampling_rate;
+}
+
+/************************** sysfs interface ************************/
+
+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);
+ 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;
+ 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);
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ unsigned int input;
+ int ret;
+ ret = sscanf(buf, "%u", &input);
+
+ if (ret != 1 || input > 100 || input <= cs_tuners->down_threshold)
+ return -EINVAL;
+
+ dbs_data->up_threshold = input;
+ return count;
+}
+
+static ssize_t store_down_threshold(struct gov_attr_set *attr_set,
+ const char *buf, size_t count)
+{
+ struct dbs_data *dbs_data = to_dbs_data(attr_set);
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ unsigned int input;
+ int ret;
+ ret = sscanf(buf, "%u", &input);
+
+ /* cannot be lower than 1 otherwise freq will not fall */
+ if (ret != 1 || input < 1 || input > 100 ||
+ input >= dbs_data->up_threshold)
+ return -EINVAL;
+
+ cs_tuners->down_threshold = input;
+ 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_freq_step(struct gov_attr_set *attr_set, const char *buf,
+ size_t count)
+{
+ struct dbs_data *dbs_data = to_dbs_data(attr_set);
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ unsigned int input;
+ int ret;
+ ret = sscanf(buf, "%u", &input);
+
+ if (ret != 1)
+ return -EINVAL;
+
+ if (input > 100)
+ input = 100;
+
+ /*
+ * no need to test here if freq_step is zero as the user might actually
+ * want this, they would be crazy though :)
+ */
+ cs_tuners->freq_step = input;
+ return count;
+}
+
+gov_show_one_common(sampling_rate);
+gov_show_one_common(sampling_down_factor);
+gov_show_one_common(up_threshold);
+gov_show_one_common(ignore_nice_load);
+gov_show_one(cs, down_threshold);
+gov_show_one(cs, freq_step);
+
+gov_attr_rw(sampling_rate);
+gov_attr_rw(sampling_down_factor);
+gov_attr_rw(up_threshold);
+gov_attr_rw(ignore_nice_load);
+gov_attr_rw(down_threshold);
+gov_attr_rw(freq_step);
+
+static struct attribute *cs_attributes[] = {
+ &sampling_rate.attr,
+ &sampling_down_factor.attr,
+ &up_threshold.attr,
+ &down_threshold.attr,
+ &ignore_nice_load.attr,
+ &freq_step.attr,
+ NULL
+};
+
+/************************** sysfs end ************************/
+
+static struct policy_dbs_info *cs_alloc(void)
+{
+ struct cs_policy_dbs_info *dbs_info;
+
+ dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL);
+ return dbs_info ? &dbs_info->policy_dbs : NULL;
+}
+
+static void cs_free(struct policy_dbs_info *policy_dbs)
+{
+ kfree(to_dbs_info(policy_dbs));
+}
+
+static int cs_init(struct dbs_data *dbs_data)
+{
+ struct cs_dbs_tuners *tuners;
+
+ tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
+ if (!tuners)
+ return -ENOMEM;
+
+ tuners->down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD;
+ tuners->freq_step = DEF_FREQUENCY_STEP;
+ dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
+ dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
+ dbs_data->ignore_nice_load = 0;
+ dbs_data->tuners = tuners;
+
+ return 0;
+}
+
+static void cs_exit(struct dbs_data *dbs_data)
+{
+ kfree(dbs_data->tuners);
+}
+
+static void cs_start(struct cpufreq_policy *policy)
+{
+ struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
+
+ dbs_info->down_skip = 0;
+ dbs_info->requested_freq = policy->cur;
+}
+
+static struct dbs_governor cs_governor = {
+ .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("conservative"),
+ .kobj_type = { .default_attrs = cs_attributes },
+ .gov_dbs_update = cs_dbs_update,
+ .alloc = cs_alloc,
+ .free = cs_free,
+ .init = cs_init,
+ .exit = cs_exit,
+ .start = cs_start,
+};
+
+#define CPU_FREQ_GOV_CONSERVATIVE (&cs_governor.gov)
+
+static int __init cpufreq_gov_dbs_init(void)
+{
+ return cpufreq_register_governor(CPU_FREQ_GOV_CONSERVATIVE);
+}
+
+static void __exit cpufreq_gov_dbs_exit(void)
+{
+ cpufreq_unregister_governor(CPU_FREQ_GOV_CONSERVATIVE);
+}
+
+MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>");
+MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for "
+ "Low Latency Frequency Transition capable processors "
+ "optimised for use in a battery environment");
+MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
+struct cpufreq_governor *cpufreq_default_governor(void)
+{
+ return CPU_FREQ_GOV_CONSERVATIVE;
+}
+
+fs_initcall(cpufreq_gov_dbs_init);
+#else
+module_init(cpufreq_gov_dbs_init);
+#endif
+module_exit(cpufreq_gov_dbs_exit);