#include "cpufreq_governor.h"
-static struct attribute_group *get_sysfs_attr(struct dbs_data *dbs_data)
+DEFINE_MUTEX(dbs_data_mutex);
+EXPORT_SYMBOL_GPL(dbs_data_mutex);
+
+static struct attribute_group *get_sysfs_attr(struct dbs_governor *gov)
{
- if (have_governor_per_policy())
- return dbs_data->cdata->attr_group_gov_pol;
- else
- return dbs_data->cdata->attr_group_gov_sys;
+ return have_governor_per_policy() ?
+ gov->attr_group_gov_pol : gov->attr_group_gov_sys;
}
-void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
+void dbs_check_cpu(struct cpufreq_policy *policy)
{
- struct cpu_dbs_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
+ int cpu = policy->cpu;
+ struct dbs_governor *gov = dbs_governor_of(policy);
+ 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;
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
- struct cpufreq_policy *policy = cdbs->shared->policy;
unsigned int sampling_rate;
unsigned int max_load = 0;
unsigned int ignore_nice;
unsigned int j;
- if (dbs_data->cdata->governor == GOV_ONDEMAND) {
+ if (gov->governor == GOV_ONDEMAND) {
struct od_cpu_dbs_info_s *od_dbs_info =
- dbs_data->cdata->get_cpu_dbs_info_s(cpu);
+ gov->get_cpu_dbs_info_s(cpu);
/*
* Sometimes, the ondemand governor uses an additional
unsigned int load;
int io_busy = 0;
- j_cdbs = dbs_data->cdata->get_cpu_cdbs(j);
+ j_cdbs = gov->get_cpu_cdbs(j);
/*
* For the purpose of ondemand, waiting for disk IO is
* not that the system is actually idle. So do not add
* the iowait time to the cpu idle time.
*/
- if (dbs_data->cdata->governor == GOV_ONDEMAND)
+ if (gov->governor == GOV_ONDEMAND)
io_busy = od_tuners->io_is_busy;
cur_idle_time = get_cpu_idle_time(j, &cur_wall_time, io_busy);
j_cdbs->prev_cpu_idle = cur_idle_time;
if (ignore_nice) {
+ struct cpu_dbs_info *cdbs = gov->get_cpu_cdbs(cpu);
u64 cur_nice;
unsigned long cur_nice_jiffies;
* dropped down. So we perform the copy only once, upon the
* first wake-up from idle.)
*
- * Detecting this situation is easy: the governor's deferrable
- * timer would not have fired during CPU-idle periods. Hence
- * an unusually large 'wall_time' (as compared to the sampling
- * rate) indicates this scenario.
+ * Detecting this situation is easy: the governor's utilization
+ * update handler would not have run during CPU-idle periods.
+ * Hence, an unusually large 'wall_time' (as compared to the
+ * sampling rate) indicates this scenario.
*
* prev_load can be zero in two cases and we must recalculate it
* for both cases:
max_load = load;
}
- dbs_data->cdata->gov_check_cpu(cpu, max_load);
+ gov->gov_check_cpu(cpu, max_load);
}
EXPORT_SYMBOL_GPL(dbs_check_cpu);
-void gov_add_timers(struct cpufreq_policy *policy, unsigned int delay)
+void gov_set_update_util(struct policy_dbs_info *policy_dbs,
+ unsigned int delay_us)
{
- struct dbs_data *dbs_data = policy->governor_data;
- struct cpu_dbs_info *cdbs;
+ struct cpufreq_policy *policy = policy_dbs->policy;
+ struct dbs_governor *gov = dbs_governor_of(policy);
int cpu;
+ gov_update_sample_delay(policy_dbs, delay_us);
+ policy_dbs->last_sample_time = 0;
+
for_each_cpu(cpu, policy->cpus) {
- cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
- cdbs->timer.expires = jiffies + delay;
- add_timer_on(&cdbs->timer, cpu);
+ struct cpu_dbs_info *cdbs = gov->get_cpu_cdbs(cpu);
+
+ cpufreq_set_update_util_data(cpu, &cdbs->update_util);
}
}
-EXPORT_SYMBOL_GPL(gov_add_timers);
+EXPORT_SYMBOL_GPL(gov_set_update_util);
-static inline void gov_cancel_timers(struct cpufreq_policy *policy)
+static inline void gov_clear_update_util(struct cpufreq_policy *policy)
{
- struct dbs_data *dbs_data = policy->governor_data;
- struct cpu_dbs_info *cdbs;
int i;
- for_each_cpu(i, policy->cpus) {
- cdbs = dbs_data->cdata->get_cpu_cdbs(i);
- del_timer_sync(&cdbs->timer);
- }
+ for_each_cpu(i, policy->cpus)
+ cpufreq_set_update_util_data(i, NULL);
+
+ synchronize_rcu();
}
-void gov_cancel_work(struct cpu_common_dbs_info *shared)
+static void gov_cancel_work(struct policy_dbs_info *policy_dbs)
{
- /* Tell dbs_timer_handler() to skip queuing up work items. */
- atomic_inc(&shared->skip_work);
- /*
- * If dbs_timer_handler() is already running, it may not notice the
- * incremented skip_work, so wait for it to complete to prevent its work
- * item from being queued up after the cancel_work_sync() below.
- */
- gov_cancel_timers(shared->policy);
+ /* Tell dbs_update_util_handler() to skip queuing up work items. */
+ atomic_inc(&policy_dbs->work_count);
/*
- * In case dbs_timer_handler() managed to run and spawn a work item
- * before the timers have been canceled, wait for that work item to
- * complete and then cancel all of the timers set up by it. If
- * dbs_timer_handler() runs again at that point, it will see the
- * positive value of skip_work and won't spawn any more work items.
+ * If dbs_update_util_handler() is already running, it may not notice
+ * the incremented work_count, so wait for it to complete to prevent its
+ * work item from being queued up after the cancel_work_sync() below.
*/
- cancel_work_sync(&shared->work);
- gov_cancel_timers(shared->policy);
- atomic_set(&shared->skip_work, 0);
-}
-EXPORT_SYMBOL_GPL(gov_cancel_work);
-
-/* Will return if we need to evaluate cpu load again or not */
-static bool need_load_eval(struct cpu_common_dbs_info *shared,
- unsigned int sampling_rate)
-{
- if (policy_is_shared(shared->policy)) {
- ktime_t time_now = ktime_get();
- s64 delta_us = ktime_us_delta(time_now, shared->time_stamp);
-
- /* Do nothing if we recently have sampled */
- if (delta_us < (s64)(sampling_rate / 2))
- return false;
- else
- shared->time_stamp = time_now;
- }
-
- return true;
+ gov_clear_update_util(policy_dbs->policy);
+ irq_work_sync(&policy_dbs->irq_work);
+ cancel_work_sync(&policy_dbs->work);
+ atomic_set(&policy_dbs->work_count, 0);
}
static void dbs_work_handler(struct work_struct *work)
{
- struct cpu_common_dbs_info *shared = container_of(work, struct
- cpu_common_dbs_info, work);
+ struct policy_dbs_info *policy_dbs;
struct cpufreq_policy *policy;
- struct dbs_data *dbs_data;
- unsigned int sampling_rate, delay;
- bool eval_load;
+ struct dbs_governor *gov;
+ unsigned int delay;
- policy = shared->policy;
- dbs_data = policy->governor_data;
+ policy_dbs = container_of(work, struct policy_dbs_info, work);
+ policy = policy_dbs->policy;
+ gov = dbs_governor_of(policy);
- /* Kill all timers */
- gov_cancel_timers(policy);
-
- if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
- struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
-
- sampling_rate = cs_tuners->sampling_rate;
- } else {
- struct od_dbs_tuners *od_tuners = dbs_data->tuners;
-
- sampling_rate = od_tuners->sampling_rate;
- }
-
- eval_load = need_load_eval(shared, sampling_rate);
+ /*
+ * Make sure cpufreq_governor_limits() isn't evaluating load or the
+ * ondemand governor isn't updating the sampling rate in parallel.
+ */
+ mutex_lock(&policy_dbs->timer_mutex);
+ delay = gov->gov_dbs_timer(policy);
+ policy_dbs->sample_delay_ns = jiffies_to_nsecs(delay);
+ mutex_unlock(&policy_dbs->timer_mutex);
/*
- * Make sure cpufreq_governor_limits() isn't evaluating load in
- * parallel.
+ * If the atomic operation below is reordered with respect to the
+ * sample delay modification, the utilization update handler may end
+ * up using a stale sample delay value.
*/
- mutex_lock(&shared->timer_mutex);
- delay = dbs_data->cdata->gov_dbs_timer(policy, eval_load);
- mutex_unlock(&shared->timer_mutex);
+ smp_mb__before_atomic();
+ atomic_dec(&policy_dbs->work_count);
+}
- atomic_dec(&shared->skip_work);
+static void dbs_irq_work(struct irq_work *irq_work)
+{
+ struct policy_dbs_info *policy_dbs;
- gov_add_timers(policy, delay);
+ policy_dbs = container_of(irq_work, struct policy_dbs_info, irq_work);
+ schedule_work(&policy_dbs->work);
}
-static void dbs_timer_handler(unsigned long data)
+static inline void gov_queue_irq_work(struct policy_dbs_info *policy_dbs)
{
- struct cpu_dbs_info *cdbs = (struct cpu_dbs_info *)data;
- struct cpu_common_dbs_info *shared = cdbs->shared;
+#ifdef CONFIG_SMP
+ irq_work_queue_on(&policy_dbs->irq_work, smp_processor_id());
+#else
+ irq_work_queue(&policy_dbs->irq_work);
+#endif
+}
+
+static void dbs_update_util_handler(struct update_util_data *data, u64 time,
+ unsigned long util, unsigned long max)
+{
+ struct cpu_dbs_info *cdbs = container_of(data, struct cpu_dbs_info, update_util);
+ struct policy_dbs_info *policy_dbs = cdbs->policy_dbs;
/*
- * Timer handler may not be allowed to queue the work at the moment,
- * because:
- * - Another timer handler has done that
- * - We are stopping the governor
- * - Or we are updating the sampling rate of the ondemand governor
+ * The work may not be allowed to be queued up right now.
+ * Possible reasons:
+ * - Work has already been queued up or is in progress.
+ * - The governor is being stopped.
+ * - It is too early (too little time from the previous sample).
*/
- if (atomic_inc_return(&shared->skip_work) > 1)
- atomic_dec(&shared->skip_work);
- else
- queue_work(system_wq, &shared->work);
+ if (atomic_inc_return(&policy_dbs->work_count) == 1) {
+ u64 delta_ns;
+
+ delta_ns = time - policy_dbs->last_sample_time;
+ if ((s64)delta_ns >= policy_dbs->sample_delay_ns) {
+ policy_dbs->last_sample_time = time;
+ gov_queue_irq_work(policy_dbs);
+ return;
+ }
+ }
+ atomic_dec(&policy_dbs->work_count);
}
static void set_sampling_rate(struct dbs_data *dbs_data,
- unsigned int sampling_rate)
+ struct dbs_governor *gov,
+ unsigned int sampling_rate)
{
- if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
+ if (gov->governor == GOV_CONSERVATIVE) {
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
cs_tuners->sampling_rate = sampling_rate;
} else {
}
}
-static int alloc_common_dbs_info(struct cpufreq_policy *policy,
- struct common_dbs_data *cdata)
+static struct policy_dbs_info *alloc_policy_dbs_info(struct cpufreq_policy *policy,
+ struct dbs_governor *gov)
{
- struct cpu_common_dbs_info *shared;
+ struct policy_dbs_info *policy_dbs;
int j;
/* Allocate memory for the common information for policy->cpus */
- shared = kzalloc(sizeof(*shared), GFP_KERNEL);
- if (!shared)
- return -ENOMEM;
+ policy_dbs = kzalloc(sizeof(*policy_dbs), GFP_KERNEL);
+ if (!policy_dbs)
+ return NULL;
- /* Set shared for all CPUs, online+offline */
- for_each_cpu(j, policy->related_cpus)
- cdata->get_cpu_cdbs(j)->shared = shared;
+ mutex_init(&policy_dbs->timer_mutex);
+ atomic_set(&policy_dbs->work_count, 0);
+ init_irq_work(&policy_dbs->irq_work, dbs_irq_work);
+ INIT_WORK(&policy_dbs->work, dbs_work_handler);
- mutex_init(&shared->timer_mutex);
- atomic_set(&shared->skip_work, 0);
- INIT_WORK(&shared->work, dbs_work_handler);
- return 0;
+ /* Set policy_dbs for all CPUs, online+offline */
+ for_each_cpu(j, policy->related_cpus) {
+ struct cpu_dbs_info *j_cdbs = gov->get_cpu_cdbs(j);
+
+ j_cdbs->policy_dbs = policy_dbs;
+ j_cdbs->update_util.func = dbs_update_util_handler;
+ }
+ return policy_dbs;
}
-static void free_common_dbs_info(struct cpufreq_policy *policy,
- struct common_dbs_data *cdata)
+static void free_policy_dbs_info(struct cpufreq_policy *policy,
+ struct dbs_governor *gov)
{
- struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(policy->cpu);
- struct cpu_common_dbs_info *shared = cdbs->shared;
+ struct cpu_dbs_info *cdbs = gov->get_cpu_cdbs(policy->cpu);
+ struct policy_dbs_info *policy_dbs = cdbs->policy_dbs;
int j;
- mutex_destroy(&shared->timer_mutex);
+ mutex_destroy(&policy_dbs->timer_mutex);
- for_each_cpu(j, policy->cpus)
- cdata->get_cpu_cdbs(j)->shared = NULL;
+ for_each_cpu(j, policy->related_cpus) {
+ struct cpu_dbs_info *j_cdbs = gov->get_cpu_cdbs(j);
- kfree(shared);
+ j_cdbs->policy_dbs = NULL;
+ j_cdbs->update_util.func = NULL;
+ }
+ kfree(policy_dbs);
}
-static int cpufreq_governor_init(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data,
- struct common_dbs_data *cdata)
+static int cpufreq_governor_init(struct cpufreq_policy *policy)
{
+ struct dbs_governor *gov = dbs_governor_of(policy);
+ struct dbs_data *dbs_data = gov->gdbs_data;
+ struct policy_dbs_info *policy_dbs;
unsigned int latency;
int ret;
if (policy->governor_data)
return -EBUSY;
- if (dbs_data) {
- if (WARN_ON(have_governor_per_policy()))
- return -EINVAL;
-
- ret = alloc_common_dbs_info(policy, cdata);
- if (ret)
- return ret;
+ policy_dbs = alloc_policy_dbs_info(policy, gov);
+ if (!policy_dbs)
+ return -ENOMEM;
+ if (dbs_data) {
+ if (WARN_ON(have_governor_per_policy())) {
+ ret = -EINVAL;
+ goto free_policy_dbs_info;
+ }
dbs_data->usage_count++;
- policy->governor_data = dbs_data;
+ policy_dbs->dbs_data = dbs_data;
+ policy->governor_data = policy_dbs;
return 0;
}
dbs_data = kzalloc(sizeof(*dbs_data), GFP_KERNEL);
- if (!dbs_data)
- return -ENOMEM;
-
- ret = alloc_common_dbs_info(policy, cdata);
- if (ret)
- goto free_dbs_data;
+ if (!dbs_data) {
+ ret = -ENOMEM;
+ goto free_policy_dbs_info;
+ }
- dbs_data->cdata = cdata;
dbs_data->usage_count = 1;
- ret = cdata->init(dbs_data, !policy->governor->initialized);
+ ret = gov->init(dbs_data, !policy->governor->initialized);
if (ret)
- goto free_common_dbs_info;
+ goto free_policy_dbs_info;
/* policy latency is in ns. Convert it to us first */
latency = policy->cpuinfo.transition_latency / 1000;
/* Bring kernel and HW constraints together */
dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
MIN_LATENCY_MULTIPLIER * latency);
- set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
+ set_sampling_rate(dbs_data, gov, max(dbs_data->min_sampling_rate,
latency * LATENCY_MULTIPLIER));
if (!have_governor_per_policy())
- cdata->gdbs_data = dbs_data;
+ gov->gdbs_data = dbs_data;
+
+ policy_dbs->dbs_data = dbs_data;
+ policy->governor_data = policy_dbs;
ret = sysfs_create_group(get_governor_parent_kobj(policy),
- get_sysfs_attr(dbs_data));
+ get_sysfs_attr(gov));
if (ret)
goto reset_gdbs_data;
- policy->governor_data = dbs_data;
-
return 0;
reset_gdbs_data:
+ policy->governor_data = NULL;
+
if (!have_governor_per_policy())
- cdata->gdbs_data = NULL;
- cdata->exit(dbs_data, !policy->governor->initialized);
-free_common_dbs_info:
- free_common_dbs_info(policy, cdata);
-free_dbs_data:
+ gov->gdbs_data = NULL;
+ gov->exit(dbs_data, !policy->governor->initialized);
kfree(dbs_data);
+
+free_policy_dbs_info:
+ free_policy_dbs_info(policy, gov);
return ret;
}
-static int cpufreq_governor_exit(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data)
+static int cpufreq_governor_exit(struct cpufreq_policy *policy)
{
- struct common_dbs_data *cdata = dbs_data->cdata;
- struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(policy->cpu);
+ struct dbs_governor *gov = dbs_governor_of(policy);
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
+ struct dbs_data *dbs_data = policy_dbs->dbs_data;
/* State should be equivalent to INIT */
- if (!cdbs->shared || cdbs->shared->policy)
+ if (policy_dbs->policy)
return -EBUSY;
- policy->governor_data = NULL;
if (!--dbs_data->usage_count) {
sysfs_remove_group(get_governor_parent_kobj(policy),
- get_sysfs_attr(dbs_data));
+ get_sysfs_attr(gov));
+
+ policy->governor_data = NULL;
if (!have_governor_per_policy())
- cdata->gdbs_data = NULL;
+ gov->gdbs_data = NULL;
- cdata->exit(dbs_data, policy->governor->initialized == 1);
+ gov->exit(dbs_data, policy->governor->initialized == 1);
kfree(dbs_data);
+ } else {
+ policy->governor_data = NULL;
}
- free_common_dbs_info(policy, cdata);
+ free_policy_dbs_info(policy, gov);
return 0;
}
-static int cpufreq_governor_start(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data)
+static int cpufreq_governor_start(struct cpufreq_policy *policy)
{
- struct common_dbs_data *cdata = dbs_data->cdata;
+ struct dbs_governor *gov = dbs_governor_of(policy);
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
+ struct dbs_data *dbs_data = policy_dbs->dbs_data;
unsigned int sampling_rate, ignore_nice, j, cpu = policy->cpu;
- struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu);
- struct cpu_common_dbs_info *shared = cdbs->shared;
int io_busy = 0;
if (!policy->cur)
return -EINVAL;
/* State should be equivalent to INIT */
- if (!shared || shared->policy)
+ if (policy_dbs->policy)
return -EBUSY;
- if (cdata->governor == GOV_CONSERVATIVE) {
+ if (gov->governor == GOV_CONSERVATIVE) {
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
sampling_rate = cs_tuners->sampling_rate;
io_busy = od_tuners->io_is_busy;
}
- shared->policy = policy;
- shared->time_stamp = ktime_get();
-
for_each_cpu(j, policy->cpus) {
- struct cpu_dbs_info *j_cdbs = cdata->get_cpu_cdbs(j);
+ struct cpu_dbs_info *j_cdbs = gov->get_cpu_cdbs(j);
unsigned int prev_load;
j_cdbs->prev_cpu_idle =
if (ignore_nice)
j_cdbs->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
-
- __setup_timer(&j_cdbs->timer, dbs_timer_handler,
- (unsigned long)j_cdbs,
- TIMER_DEFERRABLE | TIMER_IRQSAFE);
}
+ policy_dbs->policy = policy;
- if (cdata->governor == GOV_CONSERVATIVE) {
+ if (gov->governor == GOV_CONSERVATIVE) {
struct cs_cpu_dbs_info_s *cs_dbs_info =
- cdata->get_cpu_dbs_info_s(cpu);
+ gov->get_cpu_dbs_info_s(cpu);
cs_dbs_info->down_skip = 0;
cs_dbs_info->requested_freq = policy->cur;
} else {
- struct od_ops *od_ops = cdata->gov_ops;
- struct od_cpu_dbs_info_s *od_dbs_info = cdata->get_cpu_dbs_info_s(cpu);
+ struct od_ops *od_ops = gov->gov_ops;
+ struct od_cpu_dbs_info_s *od_dbs_info = gov->get_cpu_dbs_info_s(cpu);
od_dbs_info->rate_mult = 1;
od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
od_ops->powersave_bias_init_cpu(cpu);
}
- gov_add_timers(policy, delay_for_sampling_rate(sampling_rate));
+ gov_set_update_util(policy_dbs, sampling_rate);
return 0;
}
-static int cpufreq_governor_stop(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data)
+static int cpufreq_governor_stop(struct cpufreq_policy *policy)
{
- struct cpu_dbs_info *cdbs = dbs_data->cdata->get_cpu_cdbs(policy->cpu);
- struct cpu_common_dbs_info *shared = cdbs->shared;
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
/* State should be equivalent to START */
- if (!shared || !shared->policy)
+ if (!policy_dbs->policy)
return -EBUSY;
- gov_cancel_work(shared);
- shared->policy = NULL;
+ gov_cancel_work(policy_dbs);
+ policy_dbs->policy = NULL;
return 0;
}
-static int cpufreq_governor_limits(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data)
+static int cpufreq_governor_limits(struct cpufreq_policy *policy)
{
- struct common_dbs_data *cdata = dbs_data->cdata;
- unsigned int cpu = policy->cpu;
- struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu);
+ struct policy_dbs_info *policy_dbs = policy->governor_data;
/* State should be equivalent to START */
- if (!cdbs->shared || !cdbs->shared->policy)
+ if (!policy_dbs->policy)
return -EBUSY;
- mutex_lock(&cdbs->shared->timer_mutex);
- if (policy->max < cdbs->shared->policy->cur)
- __cpufreq_driver_target(cdbs->shared->policy, policy->max,
- CPUFREQ_RELATION_H);
- else if (policy->min > cdbs->shared->policy->cur)
- __cpufreq_driver_target(cdbs->shared->policy, policy->min,
- CPUFREQ_RELATION_L);
- dbs_check_cpu(dbs_data, cpu);
- mutex_unlock(&cdbs->shared->timer_mutex);
+ mutex_lock(&policy_dbs->timer_mutex);
+ if (policy->max < policy->cur)
+ __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
+ else if (policy->min > policy->cur)
+ __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
+ dbs_check_cpu(policy);
+ mutex_unlock(&policy_dbs->timer_mutex);
return 0;
}
-int cpufreq_governor_dbs(struct cpufreq_policy *policy,
- struct common_dbs_data *cdata, unsigned int event)
+int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event)
{
- struct dbs_data *dbs_data;
- int ret;
+ int ret = -EINVAL;
/* Lock governor to block concurrent initialization of governor */
- mutex_lock(&cdata->mutex);
-
- if (have_governor_per_policy())
- dbs_data = policy->governor_data;
- else
- dbs_data = cdata->gdbs_data;
-
- if (!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT)) {
- ret = -EINVAL;
- goto unlock;
- }
-
- switch (event) {
- case CPUFREQ_GOV_POLICY_INIT:
- ret = cpufreq_governor_init(policy, dbs_data, cdata);
- break;
- case CPUFREQ_GOV_POLICY_EXIT:
- ret = cpufreq_governor_exit(policy, dbs_data);
- break;
- case CPUFREQ_GOV_START:
- ret = cpufreq_governor_start(policy, dbs_data);
- break;
- case CPUFREQ_GOV_STOP:
- ret = cpufreq_governor_stop(policy, dbs_data);
- break;
- case CPUFREQ_GOV_LIMITS:
- ret = cpufreq_governor_limits(policy, dbs_data);
- break;
- default:
- ret = -EINVAL;
+ mutex_lock(&dbs_data_mutex);
+
+ if (event == CPUFREQ_GOV_POLICY_INIT) {
+ ret = cpufreq_governor_init(policy);
+ } else if (policy->governor_data) {
+ switch (event) {
+ case CPUFREQ_GOV_POLICY_EXIT:
+ ret = cpufreq_governor_exit(policy);
+ break;
+ case CPUFREQ_GOV_START:
+ ret = cpufreq_governor_start(policy);
+ break;
+ case CPUFREQ_GOV_STOP:
+ ret = cpufreq_governor_stop(policy);
+ break;
+ case CPUFREQ_GOV_LIMITS:
+ ret = cpufreq_governor_limits(policy);
+ break;
+ }
}
-unlock:
- mutex_unlock(&cdata->mutex);
-
+ mutex_unlock(&dbs_data_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_governor_dbs);
projects / mirror_ubuntu-zesty-kernel.git / blobdiff