#include "sched.h"
+#include <linux/sched/cpufreq.h>
#include <trace/events/power.h>
struct sugov_tunables {
struct gov_attr_set attr_set;
- unsigned int rate_limit_us;
+ unsigned int up_rate_limit_us;
+ unsigned int down_rate_limit_us;
};
struct sugov_policy {
raw_spinlock_t update_lock; /* For shared policies */
u64 last_freq_update_time;
- s64 freq_update_delay_ns;
+ s64 min_rate_limit_ns;
+ s64 up_rate_delay_ns;
+ s64 down_rate_delay_ns;
unsigned int next_freq;
unsigned int cached_raw_freq;
return true;
}
+ /* No need to recalculate next freq for min_rate_limit_us
+ * at least. However we might still decide to further rate
+ * limit once frequency change direction is decided, according
+ * to the separate rate limits.
+ */
+
delta_ns = time - sg_policy->last_freq_update_time;
+ return delta_ns >= sg_policy->min_rate_limit_ns;
+}
+
+static bool sugov_up_down_rate_limit(struct sugov_policy *sg_policy, u64 time,
+ unsigned int next_freq)
+{
+ s64 delta_ns;
+
+ delta_ns = time - sg_policy->last_freq_update_time;
+
+ if (next_freq > sg_policy->next_freq &&
+ delta_ns < sg_policy->up_rate_delay_ns)
+ return true;
- return delta_ns >= sg_policy->freq_update_delay_ns;
+ if (next_freq < sg_policy->next_freq &&
+ delta_ns < sg_policy->down_rate_delay_ns)
+ return true;
+
+ return false;
}
static bool sugov_update_next_freq(struct sugov_policy *sg_policy, u64 time,
if (sg_policy->next_freq == next_freq)
return false;
+ if (sugov_up_down_rate_limit(sg_policy, time, next_freq))
+ return false;
+
sg_policy->next_freq = next_freq;
sg_policy->last_freq_update_time = time;
unsigned int freq = arch_scale_freq_invariant() ?
policy->cpuinfo.max_freq : policy->cur;
- freq = (freq + (freq >> 2)) * util / max;
+ freq = map_util_freq(util, freq, max);
if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update)
return sg_policy->next_freq;
* Where the cfs,rt and dl util numbers are tracked with the same metric and
* synchronized windows and are thus directly comparable.
*
+ * The @util parameter passed to this function is assumed to be the aggregation
+ * of RT and CFS util numbers. The cases of DL and IRQ are managed here.
+ *
* The cfs,rt,dl utilization are the running times measured with rq->clock_task
* which excludes things like IRQ and steal-time. These latter are then accrued
* in the irq utilization.
* based on the task model parameters and gives the minimal utilization
* required to meet deadlines.
*/
-static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
+unsigned long schedutil_freq_util(int cpu, unsigned long util,
+ unsigned long max, enum schedutil_type type)
{
- struct rq *rq = cpu_rq(sg_cpu->cpu);
- unsigned long util, irq, max;
-
- sg_cpu->max = max = arch_scale_cpu_capacity(NULL, sg_cpu->cpu);
- sg_cpu->bw_dl = cpu_bw_dl(rq);
+ unsigned long dl_util, irq;
+ struct rq *rq = cpu_rq(cpu);
- if (rt_rq_is_runnable(&rq->rt))
+ if (sched_feat(SUGOV_RT_MAX_FREQ) && type == FREQUENCY_UTIL &&
+ rt_rq_is_runnable(&rq->rt))
return max;
/*
return max;
/*
- * Because the time spend on RT/DL tasks is visible as 'lost' time to
- * CFS tasks and we use the same metric to track the effective
- * utilization (PELT windows are synchronized) we can directly add them
- * to obtain the CPU's actual utilization.
+ * The function is called with @util defined as the aggregation (the
+ * sum) of RT and CFS signals, hence leaving the special case of DL
+ * to be delt with. The exact way of doing things depend on the calling
+ * context.
*/
- util = cpu_util_cfs(rq);
- util += cpu_util_rt(rq);
+ dl_util = cpu_util_dl(rq);
/*
- * We do not make cpu_util_dl() a permanent part of this sum because we
- * want to use cpu_bw_dl() later on, but we need to check if the
- * CFS+RT+DL sum is saturated (ie. no idle time) such that we select
- * f_max when there is no idle time.
+ * For frequency selection we do not make cpu_util_dl() a permanent part
+ * of this sum because we want to use cpu_bw_dl() later on, but we need
+ * to check if the CFS+RT+DL sum is saturated (ie. no idle time) such
+ * that we select f_max when there is no idle time.
*
* NOTE: numerical errors or stop class might cause us to not quite hit
* saturation when we should -- something for later.
*/
- if ((util + cpu_util_dl(rq)) >= max)
+ if (util + dl_util >= max)
return max;
/*
+ * OTOH, for energy computation we need the estimated running time, so
+ * include util_dl and ignore dl_bw.
+ */
+ if (type == ENERGY_UTIL)
+ util += dl_util;
+
+ /*
* There is still idle time; further improve the number by using the
* irq metric. Because IRQ/steal time is hidden from the task clock we
* need to scale the task numbers:
* bw_dl as requested freq. However, cpufreq is not yet ready for such
* an interface. So, we only do the latter for now.
*/
- return min(max, util + sg_cpu->bw_dl);
+ if (type == FREQUENCY_UTIL)
+ util += cpu_bw_dl(rq);
+
+ return min(max, util);
+}
+
+static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
+{
+ struct rq *rq = cpu_rq(sg_cpu->cpu);
+ unsigned long util = boosted_cpu_util(sg_cpu->cpu, cpu_util_rt(rq));
+ unsigned long max = arch_scale_cpu_capacity(NULL, sg_cpu->cpu);
+
+ sg_cpu->max = max;
+ sg_cpu->bw_dl = cpu_bw_dl(rq);
+
+ return schedutil_freq_util(sg_cpu->cpu, util, max, FREQUENCY_UTIL);
}
/**
return container_of(attr_set, struct sugov_tunables, attr_set);
}
-static ssize_t rate_limit_us_show(struct gov_attr_set *attr_set, char *buf)
+static DEFINE_MUTEX(min_rate_lock);
+
+static void update_min_rate_limit_ns(struct sugov_policy *sg_policy)
+{
+ mutex_lock(&min_rate_lock);
+ sg_policy->min_rate_limit_ns = min(sg_policy->up_rate_delay_ns,
+ sg_policy->down_rate_delay_ns);
+ mutex_unlock(&min_rate_lock);
+}
+
+static ssize_t up_rate_limit_us_show(struct gov_attr_set *attr_set, char *buf)
{
struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
- return sprintf(buf, "%u\n", tunables->rate_limit_us);
+ return sprintf(buf, "%u\n", tunables->up_rate_limit_us);
}
-static ssize_t
-rate_limit_us_store(struct gov_attr_set *attr_set, const char *buf, size_t count)
+static ssize_t down_rate_limit_us_show(struct gov_attr_set *attr_set, char *buf)
+{
+ struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
+
+ return sprintf(buf, "%u\n", tunables->down_rate_limit_us);
+}
+
+static ssize_t up_rate_limit_us_store(struct gov_attr_set *attr_set,
+ const char *buf, size_t count)
{
struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
struct sugov_policy *sg_policy;
if (kstrtouint(buf, 10, &rate_limit_us))
return -EINVAL;
- tunables->rate_limit_us = rate_limit_us;
+ tunables->up_rate_limit_us = rate_limit_us;
- list_for_each_entry(sg_policy, &attr_set->policy_list, tunables_hook)
- sg_policy->freq_update_delay_ns = rate_limit_us * NSEC_PER_USEC;
+ list_for_each_entry(sg_policy, &attr_set->policy_list, tunables_hook) {
+ sg_policy->up_rate_delay_ns = rate_limit_us * NSEC_PER_USEC;
+ update_min_rate_limit_ns(sg_policy);
+ }
return count;
}
-static struct governor_attr rate_limit_us = __ATTR_RW(rate_limit_us);
+static ssize_t down_rate_limit_us_store(struct gov_attr_set *attr_set,
+ const char *buf, size_t count)
+{
+ struct sugov_tunables *tunables = to_sugov_tunables(attr_set);
+ struct sugov_policy *sg_policy;
+ unsigned int rate_limit_us;
+
+ if (kstrtouint(buf, 10, &rate_limit_us))
+ return -EINVAL;
+
+ tunables->down_rate_limit_us = rate_limit_us;
+
+ list_for_each_entry(sg_policy, &attr_set->policy_list, tunables_hook) {
+ sg_policy->down_rate_delay_ns = rate_limit_us * NSEC_PER_USEC;
+ update_min_rate_limit_ns(sg_policy);
+ }
+
+ return count;
+}
+
+static struct governor_attr up_rate_limit_us = __ATTR_RW(up_rate_limit_us);
+static struct governor_attr down_rate_limit_us = __ATTR_RW(down_rate_limit_us);
static struct attribute *sugov_attributes[] = {
- &rate_limit_us.attr,
+ &up_rate_limit_us.attr,
+ &down_rate_limit_us.attr,
NULL
};
/********************** cpufreq governor interface *********************/
-static struct cpufreq_governor schedutil_gov;
+struct cpufreq_governor schedutil_gov;
static struct sugov_policy *sugov_policy_alloc(struct cpufreq_policy *policy)
{
goto stop_kthread;
}
- tunables->rate_limit_us = cpufreq_policy_transition_delay_us(policy);
+ tunables->up_rate_limit_us = cpufreq_policy_transition_delay_us(policy);
+ tunables->down_rate_limit_us = cpufreq_policy_transition_delay_us(policy);
policy->governor_data = sg_policy;
sg_policy->tunables = tunables;
struct sugov_policy *sg_policy = policy->governor_data;
unsigned int cpu;
- sg_policy->freq_update_delay_ns = sg_policy->tunables->rate_limit_us * NSEC_PER_USEC;
+ sg_policy->up_rate_delay_ns =
+ sg_policy->tunables->up_rate_limit_us * NSEC_PER_USEC;
+ sg_policy->down_rate_delay_ns =
+ sg_policy->tunables->down_rate_limit_us * NSEC_PER_USEC;
+ update_min_rate_limit_ns(sg_policy);
sg_policy->last_freq_update_time = 0;
sg_policy->next_freq = 0;
sg_policy->work_in_progress = false;
sg_policy->limits_changed = true;
}
-static struct cpufreq_governor schedutil_gov = {
+struct cpufreq_governor schedutil_gov = {
.name = "schedutil",
.owner = THIS_MODULE,
.dynamic_switching = true,
return cpufreq_register_governor(&schedutil_gov);
}
fs_initcall(sugov_register);
+
+#ifdef CONFIG_ENERGY_MODEL
+extern bool sched_energy_update;
+extern struct mutex sched_energy_mutex;
+
+static void rebuild_sd_workfn(struct work_struct *work)
+{
+ mutex_lock(&sched_energy_mutex);
+ sched_energy_update = true;
+ rebuild_sched_domains();
+ sched_energy_update = false;
+ mutex_unlock(&sched_energy_mutex);
+}
+static DECLARE_WORK(rebuild_sd_work, rebuild_sd_workfn);
+
+/*
+ * EAS shouldn't be attempted without sugov, so rebuild the sched_domains
+ * on governor changes to make sure the scheduler knows about it.
+ */
+void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
+ struct cpufreq_governor *old_gov)
+{
+ if (old_gov == &schedutil_gov || policy->governor == &schedutil_gov) {
+ /*
+ * When called from the cpufreq_register_driver() path, the
+ * cpu_hotplug_lock is already held, so use a work item to
+ * avoid nested locking in rebuild_sched_domains().
+ */
+ schedule_work(&rebuild_sd_work);
+ }
+
+}
+#endif
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