void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
{
- struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
+ struct cpu_dbs_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
struct od_dbs_tuners *od_tuners = dbs_data->tuners;
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
- struct cpufreq_policy *policy;
+ struct cpufreq_policy *policy = cdbs->shared->policy;
unsigned int sampling_rate;
unsigned int max_load = 0;
unsigned int ignore_nice;
ignore_nice = cs_tuners->ignore_nice_load;
}
- policy = cdbs->cur_policy;
-
/* Get Absolute Load */
for_each_cpu(j, policy->cpus) {
- struct cpu_dbs_common_info *j_cdbs;
+ struct cpu_dbs_info *j_cdbs;
u64 cur_wall_time, cur_idle_time;
unsigned int idle_time, wall_time;
unsigned int load;
static inline void __gov_queue_work(int cpu, struct dbs_data *dbs_data,
unsigned int delay)
{
- struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
+ struct cpu_dbs_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
- mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
+ mod_delayed_work_on(cpu, system_wq, &cdbs->dwork, delay);
}
void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
static inline void gov_cancel_work(struct dbs_data *dbs_data,
struct cpufreq_policy *policy)
{
- struct cpu_dbs_common_info *cdbs;
+ struct cpu_dbs_info *cdbs;
int i;
for_each_cpu(i, policy->cpus) {
cdbs = dbs_data->cdata->get_cpu_cdbs(i);
- cancel_delayed_work_sync(&cdbs->work);
+ cancel_delayed_work_sync(&cdbs->dwork);
}
}
/* Will return if we need to evaluate cpu load again or not */
-bool need_load_eval(struct cpu_dbs_common_info *cdbs,
- unsigned int sampling_rate)
+static bool need_load_eval(struct cpu_common_dbs_info *shared,
+ unsigned int sampling_rate)
{
- if (policy_is_shared(cdbs->cur_policy)) {
+ if (policy_is_shared(shared->policy)) {
ktime_t time_now = ktime_get();
- s64 delta_us = ktime_us_delta(time_now, cdbs->time_stamp);
+ 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
- cdbs->time_stamp = time_now;
+ shared->time_stamp = time_now;
}
return true;
}
-EXPORT_SYMBOL_GPL(need_load_eval);
+
+static void dbs_timer(struct work_struct *work)
+{
+ struct cpu_dbs_info *cdbs = container_of(work, struct cpu_dbs_info,
+ dwork.work);
+ struct cpu_common_dbs_info *shared = cdbs->shared;
+ struct cpufreq_policy *policy = shared->policy;
+ struct dbs_data *dbs_data = policy->governor_data;
+ unsigned int sampling_rate, delay;
+ bool modify_all = true;
+
+ mutex_lock(&shared->timer_mutex);
+
+ 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;
+ }
+
+ if (!need_load_eval(cdbs->shared, sampling_rate))
+ modify_all = false;
+
+ delay = dbs_data->cdata->gov_dbs_timer(cdbs, dbs_data, modify_all);
+ gov_queue_work(dbs_data, policy, delay, modify_all);
+
+ mutex_unlock(&shared->timer_mutex);
+}
static void set_sampling_rate(struct dbs_data *dbs_data,
unsigned int sampling_rate)
}
}
+static int alloc_common_dbs_info(struct cpufreq_policy *policy,
+ struct common_dbs_data *cdata)
+{
+ struct cpu_common_dbs_info *shared;
+ int j;
+
+ /* Allocate memory for the common information for policy->cpus */
+ shared = kzalloc(sizeof(*shared), GFP_KERNEL);
+ if (!shared)
+ return -ENOMEM;
+
+ /* Set shared for all CPUs, online+offline */
+ for_each_cpu(j, policy->related_cpus)
+ cdata->get_cpu_cdbs(j)->shared = shared;
+
+ return 0;
+}
+
+static void free_common_dbs_info(struct cpufreq_policy *policy,
+ struct common_dbs_data *cdata)
+{
+ struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(policy->cpu);
+ struct cpu_common_dbs_info *shared = cdbs->shared;
+ int j;
+
+ for_each_cpu(j, policy->cpus)
+ cdata->get_cpu_cdbs(j)->shared = NULL;
+
+ kfree(shared);
+}
+
static int cpufreq_governor_init(struct cpufreq_policy *policy,
struct dbs_data *dbs_data,
struct common_dbs_data *cdata)
unsigned int latency;
int ret;
+ /* State should be equivalent to EXIT */
+ 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;
+
dbs_data->usage_count++;
policy->governor_data = dbs_data;
return 0;
if (!dbs_data)
return -ENOMEM;
+ ret = alloc_common_dbs_info(policy, cdata);
+ if (ret)
+ goto free_dbs_data;
+
dbs_data->cdata = cdata;
dbs_data->usage_count = 1;
ret = cdata->init(dbs_data, !policy->governor->initialized);
if (ret)
- goto free_dbs_data;
+ goto free_common_dbs_info;
/* policy latency is in ns. Convert it to us first */
latency = policy->cpuinfo.transition_latency / 1000;
}
cdata_exit:
cdata->exit(dbs_data, !policy->governor->initialized);
+free_common_dbs_info:
+ free_common_dbs_info(policy, cdata);
free_dbs_data:
kfree(dbs_data);
return ret;
}
-static void cpufreq_governor_exit(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data)
+static int cpufreq_governor_exit(struct cpufreq_policy *policy,
+ struct dbs_data *dbs_data)
{
struct common_dbs_data *cdata = dbs_data->cdata;
+ struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(policy->cpu);
+
+ /* State should be equivalent to INIT */
+ if (!cdbs->shared || cdbs->shared->policy)
+ return -EBUSY;
policy->governor_data = NULL;
if (!--dbs_data->usage_count) {
cdata->exit(dbs_data, policy->governor->initialized == 1);
kfree(dbs_data);
}
+
+ free_common_dbs_info(policy, cdata);
+ return 0;
}
static int cpufreq_governor_start(struct cpufreq_policy *policy,
{
struct common_dbs_data *cdata = dbs_data->cdata;
unsigned int sampling_rate, ignore_nice, j, cpu = policy->cpu;
- struct cpu_dbs_common_info *cpu_cdbs = cdata->get_cpu_cdbs(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)
+ return -EBUSY;
+
if (cdata->governor == GOV_CONSERVATIVE) {
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
io_busy = od_tuners->io_is_busy;
}
+ shared->policy = policy;
+ shared->time_stamp = ktime_get();
+ mutex_init(&shared->timer_mutex);
+
for_each_cpu(j, policy->cpus) {
- struct cpu_dbs_common_info *j_cdbs = cdata->get_cpu_cdbs(j);
+ struct cpu_dbs_info *j_cdbs = cdata->get_cpu_cdbs(j);
unsigned int prev_load;
- j_cdbs->cpu = j;
- j_cdbs->cur_policy = policy;
j_cdbs->prev_cpu_idle =
get_cpu_idle_time(j, &j_cdbs->prev_cpu_wall, io_busy);
if (ignore_nice)
j_cdbs->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
- mutex_init(&j_cdbs->timer_mutex);
- INIT_DEFERRABLE_WORK(&j_cdbs->work, cdata->gov_dbs_timer);
+ INIT_DEFERRABLE_WORK(&j_cdbs->dwork, dbs_timer);
}
if (cdata->governor == GOV_CONSERVATIVE) {
od_ops->powersave_bias_init_cpu(cpu);
}
- /* Initiate timer time stamp */
- cpu_cdbs->time_stamp = ktime_get();
-
gov_queue_work(dbs_data, policy, delay_for_sampling_rate(sampling_rate),
true);
return 0;
}
-static void cpufreq_governor_stop(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data)
+static int cpufreq_governor_stop(struct cpufreq_policy *policy,
+ struct dbs_data *dbs_data)
{
struct common_dbs_data *cdata = dbs_data->cdata;
unsigned int cpu = policy->cpu;
- struct cpu_dbs_common_info *cpu_cdbs = cdata->get_cpu_cdbs(cpu);
+ struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu);
+ struct cpu_common_dbs_info *shared = cdbs->shared;
+
+ /* State should be equivalent to START */
+ if (!shared || !shared->policy)
+ return -EBUSY;
+
+ gov_cancel_work(dbs_data, policy);
if (cdata->governor == GOV_CONSERVATIVE) {
struct cs_cpu_dbs_info_s *cs_dbs_info =
cs_dbs_info->enable = 0;
}
- gov_cancel_work(dbs_data, policy);
-
- mutex_destroy(&cpu_cdbs->timer_mutex);
- cpu_cdbs->cur_policy = NULL;
+ shared->policy = NULL;
+ mutex_destroy(&shared->timer_mutex);
+ return 0;
}
-static void cpufreq_governor_limits(struct cpufreq_policy *policy,
- struct dbs_data *dbs_data)
+static int cpufreq_governor_limits(struct cpufreq_policy *policy,
+ struct dbs_data *dbs_data)
{
struct common_dbs_data *cdata = dbs_data->cdata;
unsigned int cpu = policy->cpu;
- struct cpu_dbs_common_info *cpu_cdbs = cdata->get_cpu_cdbs(cpu);
+ struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu);
- if (!cpu_cdbs->cur_policy)
- return;
+ /* State should be equivalent to START */
+ if (!cdbs->shared || !cdbs->shared->policy)
+ return -EBUSY;
- mutex_lock(&cpu_cdbs->timer_mutex);
- if (policy->max < cpu_cdbs->cur_policy->cur)
- __cpufreq_driver_target(cpu_cdbs->cur_policy, policy->max,
+ 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 > cpu_cdbs->cur_policy->cur)
- __cpufreq_driver_target(cpu_cdbs->cur_policy, policy->min,
+ 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(&cpu_cdbs->timer_mutex);
+ mutex_unlock(&cdbs->shared->timer_mutex);
+
+ return 0;
}
int cpufreq_governor_dbs(struct cpufreq_policy *policy,
struct common_dbs_data *cdata, unsigned int event)
{
struct dbs_data *dbs_data;
- int ret = 0;
+ int ret;
/* Lock governor to block concurrent initialization of governor */
mutex_lock(&cdata->mutex);
else
dbs_data = cdata->gdbs_data;
- if (WARN_ON(!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT))) {
+ if (!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT)) {
ret = -EINVAL;
goto unlock;
}
ret = cpufreq_governor_init(policy, dbs_data, cdata);
break;
case CPUFREQ_GOV_POLICY_EXIT:
- cpufreq_governor_exit(policy, dbs_data);
+ ret = cpufreq_governor_exit(policy, dbs_data);
break;
case CPUFREQ_GOV_START:
ret = cpufreq_governor_start(policy, dbs_data);
break;
case CPUFREQ_GOV_STOP:
- cpufreq_governor_stop(policy, dbs_data);
+ ret = cpufreq_governor_stop(policy, dbs_data);
break;
case CPUFREQ_GOV_LIMITS:
- cpufreq_governor_limits(policy, dbs_data);
+ ret = cpufreq_governor_limits(policy, dbs_data);
break;
+ default:
+ ret = -EINVAL;
}
unlock:
projects / linux-2.6-microblaze.git / blobdiff