mirror of https://gitee.com/openkylin/linux.git
cpufreq: governor: split cpufreq_governor_dbs()
cpufreq_governor_dbs() is hardly readable, it is just too big and complicated. Lets make it more readable by splitting out event specific routines. Order of statements is changed at few places, but that shouldn't bring any functional change. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
Rafael J. Wysocki
parent
8e0484d2b3
commit
714a2d9c87
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@ -239,19 +239,218 @@ static void set_sampling_rate(struct dbs_data *dbs_data,
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}
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}
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static int cpufreq_governor_init(struct cpufreq_policy *policy,
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struct dbs_data *dbs_data,
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struct common_dbs_data *cdata)
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{
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unsigned int latency;
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int ret;
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if (dbs_data) {
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if (WARN_ON(have_governor_per_policy()))
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return -EINVAL;
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dbs_data->usage_count++;
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policy->governor_data = dbs_data;
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return 0;
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}
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dbs_data = kzalloc(sizeof(*dbs_data), GFP_KERNEL);
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if (!dbs_data)
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return -ENOMEM;
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dbs_data->cdata = cdata;
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dbs_data->usage_count = 1;
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ret = cdata->init(dbs_data, !policy->governor->initialized);
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if (ret)
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goto free_dbs_data;
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/* policy latency is in ns. Convert it to us first */
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latency = policy->cpuinfo.transition_latency / 1000;
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if (latency == 0)
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latency = 1;
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/* Bring kernel and HW constraints together */
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dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
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MIN_LATENCY_MULTIPLIER * latency);
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set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
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latency * LATENCY_MULTIPLIER));
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if (!have_governor_per_policy()) {
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if (WARN_ON(cpufreq_get_global_kobject())) {
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ret = -EINVAL;
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goto cdata_exit;
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}
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cdata->gdbs_data = dbs_data;
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}
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ret = sysfs_create_group(get_governor_parent_kobj(policy),
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get_sysfs_attr(dbs_data));
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if (ret)
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goto put_kobj;
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policy->governor_data = dbs_data;
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return 0;
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put_kobj:
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if (!have_governor_per_policy()) {
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cdata->gdbs_data = NULL;
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cpufreq_put_global_kobject();
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}
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cdata_exit:
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cdata->exit(dbs_data, !policy->governor->initialized);
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free_dbs_data:
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kfree(dbs_data);
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return ret;
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}
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static void cpufreq_governor_exit(struct cpufreq_policy *policy,
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struct dbs_data *dbs_data)
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{
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struct common_dbs_data *cdata = dbs_data->cdata;
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policy->governor_data = NULL;
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if (!--dbs_data->usage_count) {
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sysfs_remove_group(get_governor_parent_kobj(policy),
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get_sysfs_attr(dbs_data));
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if (!have_governor_per_policy()) {
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cdata->gdbs_data = NULL;
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cpufreq_put_global_kobject();
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}
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cdata->exit(dbs_data, policy->governor->initialized == 1);
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kfree(dbs_data);
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}
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}
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static int cpufreq_governor_start(struct cpufreq_policy *policy,
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struct dbs_data *dbs_data)
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{
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struct common_dbs_data *cdata = dbs_data->cdata;
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unsigned int sampling_rate, ignore_nice, j, cpu = policy->cpu;
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struct cpu_dbs_common_info *cpu_cdbs = cdata->get_cpu_cdbs(cpu);
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int io_busy = 0;
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if (!policy->cur)
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return -EINVAL;
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if (cdata->governor == GOV_CONSERVATIVE) {
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struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
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sampling_rate = cs_tuners->sampling_rate;
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ignore_nice = cs_tuners->ignore_nice_load;
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} else {
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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sampling_rate = od_tuners->sampling_rate;
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ignore_nice = od_tuners->ignore_nice_load;
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io_busy = od_tuners->io_is_busy;
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}
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mutex_lock(&dbs_data->mutex);
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for_each_cpu(j, policy->cpus) {
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struct cpu_dbs_common_info *j_cdbs = cdata->get_cpu_cdbs(j);
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unsigned int prev_load;
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j_cdbs->cpu = j;
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j_cdbs->cur_policy = policy;
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j_cdbs->prev_cpu_idle =
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get_cpu_idle_time(j, &j_cdbs->prev_cpu_wall, io_busy);
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prev_load = (unsigned int)(j_cdbs->prev_cpu_wall -
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j_cdbs->prev_cpu_idle);
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j_cdbs->prev_load = 100 * prev_load /
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(unsigned int)j_cdbs->prev_cpu_wall;
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if (ignore_nice)
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j_cdbs->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
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mutex_init(&j_cdbs->timer_mutex);
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INIT_DEFERRABLE_WORK(&j_cdbs->work, cdata->gov_dbs_timer);
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}
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if (cdata->governor == GOV_CONSERVATIVE) {
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struct cs_cpu_dbs_info_s *cs_dbs_info =
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cdata->get_cpu_dbs_info_s(cpu);
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cs_dbs_info->down_skip = 0;
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cs_dbs_info->enable = 1;
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cs_dbs_info->requested_freq = policy->cur;
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} else {
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struct od_ops *od_ops = cdata->gov_ops;
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struct od_cpu_dbs_info_s *od_dbs_info = cdata->get_cpu_dbs_info_s(cpu);
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od_dbs_info->rate_mult = 1;
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od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
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od_ops->powersave_bias_init_cpu(cpu);
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}
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mutex_unlock(&dbs_data->mutex);
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/* Initiate timer time stamp */
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cpu_cdbs->time_stamp = ktime_get();
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gov_queue_work(dbs_data, policy, delay_for_sampling_rate(sampling_rate),
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true);
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return 0;
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}
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static void cpufreq_governor_stop(struct cpufreq_policy *policy,
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struct dbs_data *dbs_data)
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{
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struct common_dbs_data *cdata = dbs_data->cdata;
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unsigned int cpu = policy->cpu;
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struct cpu_dbs_common_info *cpu_cdbs = cdata->get_cpu_cdbs(cpu);
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if (cdata->governor == GOV_CONSERVATIVE) {
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struct cs_cpu_dbs_info_s *cs_dbs_info =
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cdata->get_cpu_dbs_info_s(cpu);
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cs_dbs_info->enable = 0;
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}
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gov_cancel_work(dbs_data, policy);
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mutex_lock(&dbs_data->mutex);
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mutex_destroy(&cpu_cdbs->timer_mutex);
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cpu_cdbs->cur_policy = NULL;
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mutex_unlock(&dbs_data->mutex);
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}
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static void cpufreq_governor_limits(struct cpufreq_policy *policy,
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struct dbs_data *dbs_data)
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{
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struct common_dbs_data *cdata = dbs_data->cdata;
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unsigned int cpu = policy->cpu;
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struct cpu_dbs_common_info *cpu_cdbs = cdata->get_cpu_cdbs(cpu);
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mutex_lock(&dbs_data->mutex);
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if (!cpu_cdbs->cur_policy) {
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mutex_unlock(&dbs_data->mutex);
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return;
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}
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mutex_lock(&cpu_cdbs->timer_mutex);
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if (policy->max < cpu_cdbs->cur_policy->cur)
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__cpufreq_driver_target(cpu_cdbs->cur_policy, policy->max,
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CPUFREQ_RELATION_H);
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else if (policy->min > cpu_cdbs->cur_policy->cur)
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__cpufreq_driver_target(cpu_cdbs->cur_policy, policy->min,
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CPUFREQ_RELATION_L);
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dbs_check_cpu(dbs_data, cpu);
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mutex_unlock(&cpu_cdbs->timer_mutex);
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mutex_unlock(&dbs_data->mutex);
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}
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int cpufreq_governor_dbs(struct cpufreq_policy *policy,
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struct common_dbs_data *cdata, unsigned int event)
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struct common_dbs_data *cdata, unsigned int event)
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{
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struct dbs_data *dbs_data;
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struct od_cpu_dbs_info_s *od_dbs_info = NULL;
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struct cs_cpu_dbs_info_s *cs_dbs_info = NULL;
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struct od_ops *od_ops = NULL;
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struct od_dbs_tuners *od_tuners = NULL;
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struct cs_dbs_tuners *cs_tuners = NULL;
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struct cpu_dbs_common_info *cpu_cdbs;
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unsigned int sampling_rate, latency, ignore_nice, j, cpu = policy->cpu;
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int io_busy = 0;
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int rc;
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int ret = 0;
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if (have_governor_per_policy())
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dbs_data = policy->governor_data;
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@ -262,172 +461,22 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
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switch (event) {
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case CPUFREQ_GOV_POLICY_INIT:
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if (have_governor_per_policy()) {
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WARN_ON(dbs_data);
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} else if (dbs_data) {
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dbs_data->usage_count++;
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policy->governor_data = dbs_data;
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return 0;
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}
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dbs_data = kzalloc(sizeof(*dbs_data), GFP_KERNEL);
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if (!dbs_data) {
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pr_err("%s: POLICY_INIT: kzalloc failed\n", __func__);
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return -ENOMEM;
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}
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dbs_data->cdata = cdata;
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dbs_data->usage_count = 1;
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rc = cdata->init(dbs_data, !policy->governor->initialized);
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if (rc) {
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pr_err("%s: POLICY_INIT: init() failed\n", __func__);
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kfree(dbs_data);
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return rc;
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}
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if (!have_governor_per_policy())
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WARN_ON(cpufreq_get_global_kobject());
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rc = sysfs_create_group(get_governor_parent_kobj(policy),
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get_sysfs_attr(dbs_data));
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if (rc) {
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cdata->exit(dbs_data, !policy->governor->initialized);
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kfree(dbs_data);
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return rc;
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}
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policy->governor_data = dbs_data;
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/* policy latency is in ns. Convert it to us first */
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latency = policy->cpuinfo.transition_latency / 1000;
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if (latency == 0)
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latency = 1;
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/* Bring kernel and HW constraints together */
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dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
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MIN_LATENCY_MULTIPLIER * latency);
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set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
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latency * LATENCY_MULTIPLIER));
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if (!have_governor_per_policy())
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cdata->gdbs_data = dbs_data;
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return 0;
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ret = cpufreq_governor_init(policy, dbs_data, cdata);
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break;
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case CPUFREQ_GOV_POLICY_EXIT:
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if (!--dbs_data->usage_count) {
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sysfs_remove_group(get_governor_parent_kobj(policy),
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get_sysfs_attr(dbs_data));
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if (!have_governor_per_policy())
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cpufreq_put_global_kobject();
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cdata->exit(dbs_data, policy->governor->initialized == 1);
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kfree(dbs_data);
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cdata->gdbs_data = NULL;
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}
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policy->governor_data = NULL;
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return 0;
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}
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cpu_cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
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if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
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cs_tuners = dbs_data->tuners;
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cs_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
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sampling_rate = cs_tuners->sampling_rate;
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ignore_nice = cs_tuners->ignore_nice_load;
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} else {
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od_tuners = dbs_data->tuners;
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od_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
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sampling_rate = od_tuners->sampling_rate;
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ignore_nice = od_tuners->ignore_nice_load;
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od_ops = dbs_data->cdata->gov_ops;
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io_busy = od_tuners->io_is_busy;
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}
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switch (event) {
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cpufreq_governor_exit(policy, dbs_data);
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break;
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case CPUFREQ_GOV_START:
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if (!policy->cur)
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return -EINVAL;
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mutex_lock(&dbs_data->mutex);
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for_each_cpu(j, policy->cpus) {
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struct cpu_dbs_common_info *j_cdbs =
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dbs_data->cdata->get_cpu_cdbs(j);
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unsigned int prev_load;
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j_cdbs->cpu = j;
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j_cdbs->cur_policy = policy;
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j_cdbs->prev_cpu_idle = get_cpu_idle_time(j,
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&j_cdbs->prev_cpu_wall, io_busy);
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prev_load = (unsigned int)
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(j_cdbs->prev_cpu_wall - j_cdbs->prev_cpu_idle);
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j_cdbs->prev_load = 100 * prev_load /
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(unsigned int) j_cdbs->prev_cpu_wall;
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if (ignore_nice)
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j_cdbs->prev_cpu_nice =
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kcpustat_cpu(j).cpustat[CPUTIME_NICE];
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mutex_init(&j_cdbs->timer_mutex);
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INIT_DEFERRABLE_WORK(&j_cdbs->work,
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dbs_data->cdata->gov_dbs_timer);
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}
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if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
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cs_dbs_info->down_skip = 0;
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cs_dbs_info->enable = 1;
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cs_dbs_info->requested_freq = policy->cur;
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} else {
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od_dbs_info->rate_mult = 1;
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od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
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od_ops->powersave_bias_init_cpu(cpu);
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}
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mutex_unlock(&dbs_data->mutex);
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/* Initiate timer time stamp */
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cpu_cdbs->time_stamp = ktime_get();
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gov_queue_work(dbs_data, policy,
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delay_for_sampling_rate(sampling_rate), true);
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ret = cpufreq_governor_start(policy, dbs_data);
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break;
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case CPUFREQ_GOV_STOP:
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if (dbs_data->cdata->governor == GOV_CONSERVATIVE)
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cs_dbs_info->enable = 0;
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gov_cancel_work(dbs_data, policy);
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mutex_lock(&dbs_data->mutex);
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mutex_destroy(&cpu_cdbs->timer_mutex);
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cpu_cdbs->cur_policy = NULL;
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mutex_unlock(&dbs_data->mutex);
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cpufreq_governor_stop(policy, dbs_data);
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break;
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case CPUFREQ_GOV_LIMITS:
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mutex_lock(&dbs_data->mutex);
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if (!cpu_cdbs->cur_policy) {
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mutex_unlock(&dbs_data->mutex);
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break;
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}
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mutex_lock(&cpu_cdbs->timer_mutex);
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if (policy->max < cpu_cdbs->cur_policy->cur)
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__cpufreq_driver_target(cpu_cdbs->cur_policy,
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policy->max, CPUFREQ_RELATION_H);
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else if (policy->min > cpu_cdbs->cur_policy->cur)
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__cpufreq_driver_target(cpu_cdbs->cur_policy,
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policy->min, CPUFREQ_RELATION_L);
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dbs_check_cpu(dbs_data, cpu);
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mutex_unlock(&cpu_cdbs->timer_mutex);
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mutex_unlock(&dbs_data->mutex);
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cpufreq_governor_limits(policy, dbs_data);
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break;
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}
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return 0;
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return ret;
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}
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EXPORT_SYMBOL_GPL(cpufreq_governor_dbs);
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