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firmware/br-ext-chip-allwinner/board/v83x/kernel/patches/00000-kernel_sched_cpufreq_...

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diff -drupN a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
--- a/kernel/sched/cpufreq_schedutil.c 2018-08-06 17:23:04.000000000 +0300
+++ b/kernel/sched/cpufreq_schedutil.c 2022-06-12 05:28:14.000000000 +0300
@@ -12,14 +12,27 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cpufreq.h>
+#include <linux/kthread.h>
#include <linux/slab.h>
#include <trace/events/power.h>
#include "sched.h"
+#include "tune.h"
+
+unsigned long boosted_cpu_util(int cpu);
+
+/* Stub out fast switch routines present on mainline to reduce the backport
+ * overhead. */
+#define cpufreq_driver_fast_switch(x, y) 0
+#define cpufreq_enable_fast_switch(x)
+#define cpufreq_disable_fast_switch(x)
+#define LATENCY_MULTIPLIER (1000)
+#define SUGOV_KTHREAD_PRIORITY 50
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 {
@@ -30,14 +43,18 @@ 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;
/* The next fields are only needed if fast switch cannot be used. */
struct irq_work irq_work;
- struct work_struct work;
+ struct kthread_work work;
struct mutex work_lock;
+ struct kthread_worker worker;
+ struct task_struct *thread;
bool work_in_progress;
bool need_freq_update;
@@ -55,6 +72,11 @@ struct sugov_cpu {
unsigned long util;
unsigned long max;
unsigned int flags;
+
+ /* The field below is for single-CPU policies only. */
+#ifdef CONFIG_NO_HZ_COMMON
+ unsigned long saved_idle_calls;
+#endif
};
static DEFINE_PER_CPU(struct sugov_cpu, sugov_cpu);
@@ -79,7 +101,27 @@ static bool sugov_should_update_freq(str
}
delta_ns = time - sg_policy->last_freq_update_time;
- return delta_ns >= sg_policy->freq_update_delay_ns;
+
+ /* No need to recalculate next freq for min_rate_limit_us at least */
+ 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;
+
+ if (next_freq < sg_policy->next_freq &&
+ delta_ns < sg_policy->down_rate_delay_ns)
+ return true;
+
+ return false;
}
static void sugov_update_commit(struct sugov_policy *sg_policy, u64 time,
@@ -87,22 +129,26 @@ static void sugov_update_commit(struct s
{
struct cpufreq_policy *policy = sg_policy->policy;
+ if (sugov_up_down_rate_limit(sg_policy, time, next_freq)) {
+ /* Reset cached freq as next_freq isn't changed */
+ sg_policy->cached_raw_freq = 0;
+ return;
+ }
+
+ if (sg_policy->next_freq == next_freq)
+ return;
+
+ sg_policy->next_freq = next_freq;
sg_policy->last_freq_update_time = time;
if (policy->fast_switch_enabled) {
- if (sg_policy->next_freq == next_freq) {
- trace_cpu_frequency(policy->cur, smp_processor_id());
- return;
- }
- sg_policy->next_freq = next_freq;
next_freq = cpufreq_driver_fast_switch(policy, next_freq);
if (next_freq == CPUFREQ_ENTRY_INVALID)
return;
policy->cur = next_freq;
trace_cpu_frequency(next_freq, smp_processor_id());
- } else if (sg_policy->next_freq != next_freq) {
- sg_policy->next_freq = next_freq;
+ } else {
sg_policy->work_in_progress = true;
irq_work_queue(&sg_policy->irq_work);
}
@@ -110,7 +156,7 @@ static void sugov_update_commit(struct s
/**
* get_next_freq - Compute a new frequency for a given cpufreq policy.
- * @sg_cpu: schedutil cpu object to compute the new frequency for.
+ * @sg_policy: schedutil policy object to compute the new frequency for.
* @util: Current CPU utilization.
* @max: CPU capacity.
*
@@ -130,10 +176,9 @@ static void sugov_update_commit(struct s
* next_freq (as calculated above) is returned, subject to policy min/max and
* cpufreq driver limitations.
*/
-static unsigned int get_next_freq(struct sugov_cpu *sg_cpu, unsigned long util,
- unsigned long max)
+static unsigned int get_next_freq(struct sugov_policy *sg_policy,
+ unsigned long util, unsigned long max)
{
- struct sugov_policy *sg_policy = sg_cpu->sg_policy;
struct cpufreq_policy *policy = sg_policy->policy;
unsigned int freq = arch_scale_freq_invariant() ?
policy->cpuinfo.max_freq : policy->cur;
@@ -146,15 +191,36 @@ static unsigned int get_next_freq(struct
return cpufreq_driver_resolve_freq(policy, freq);
}
-static void sugov_get_util(unsigned long *util, unsigned long *max)
+static inline bool use_pelt(void)
{
- struct rq *rq = this_rq();
- unsigned long cfs_max;
+#ifdef CONFIG_SCHED_WALT
+ return (!sysctl_sched_use_walt_cpu_util || walt_disabled);
+#else
+ return true;
+#endif
+}
- cfs_max = arch_scale_cpu_capacity(NULL, smp_processor_id());
+static void sugov_get_util(unsigned long *util, unsigned long *max, u64 time)
+{
+ int cpu = smp_processor_id();
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long max_cap, rt;
+ s64 delta;
- *util = min(rq->cfs.avg.util_avg, cfs_max);
- *max = cfs_max;
+ max_cap = arch_scale_cpu_capacity(NULL, cpu);
+
+ sched_avg_update(rq);
+ delta = time - rq->age_stamp;
+ if (unlikely(delta < 0))
+ delta = 0;
+ rt = div64_u64(rq->rt_avg, sched_avg_period() + delta);
+ rt = (rt * max_cap) >> SCHED_CAPACITY_SHIFT;
+
+ *util = boosted_cpu_util(cpu);
+ if (likely(use_pelt()))
+ *util = min((*util + rt), max_cap);
+
+ *max = max_cap;
}
static void sugov_set_iowait_boost(struct sugov_cpu *sg_cpu, u64 time,
@@ -187,6 +253,19 @@ static void sugov_iowait_boost(struct su
sg_cpu->iowait_boost >>= 1;
}
+#ifdef CONFIG_NO_HZ_COMMON
+static bool sugov_cpu_is_busy(struct sugov_cpu *sg_cpu)
+{
+ unsigned long idle_calls = tick_nohz_get_idle_calls();
+ bool ret = idle_calls == sg_cpu->saved_idle_calls;
+
+ sg_cpu->saved_idle_calls = idle_calls;
+ return ret;
+}
+#else
+static inline bool sugov_cpu_is_busy(struct sugov_cpu *sg_cpu) { return false; }
+#endif /* CONFIG_NO_HZ_COMMON */
+
static void sugov_update_single(struct update_util_data *hook, u64 time,
unsigned int flags)
{
@@ -195,6 +274,7 @@ static void sugov_update_single(struct u
struct cpufreq_policy *policy = sg_policy->policy;
unsigned long util, max;
unsigned int next_f;
+ bool busy;
sugov_set_iowait_boost(sg_cpu, time, flags);
sg_cpu->last_update = time;
@@ -202,40 +282,40 @@ static void sugov_update_single(struct u
if (!sugov_should_update_freq(sg_policy, time))
return;
- if (flags & SCHED_CPUFREQ_RT_DL) {
+ busy = sugov_cpu_is_busy(sg_cpu);
+
+ if (flags & SCHED_CPUFREQ_DL) {
next_f = policy->cpuinfo.max_freq;
} else {
- sugov_get_util(&util, &max);
+ sugov_get_util(&util, &max, time);
sugov_iowait_boost(sg_cpu, &util, &max);
- next_f = get_next_freq(sg_cpu, util, max);
+ next_f = get_next_freq(sg_policy, util, max);
+ /*
+ * Do not reduce the frequency if the CPU has not been idle
+ * recently, as the reduction is likely to be premature then.
+ */
+ if (busy && next_f < sg_policy->next_freq) {
+ next_f = sg_policy->next_freq;
+
+ /* Reset cached freq as next_freq has changed */
+ sg_policy->cached_raw_freq = 0;
+ }
}
sugov_update_commit(sg_policy, time, next_f);
}
-static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu,
- unsigned long util, unsigned long max,
- unsigned int flags)
+static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
{
struct sugov_policy *sg_policy = sg_cpu->sg_policy;
struct cpufreq_policy *policy = sg_policy->policy;
- unsigned int max_f = policy->cpuinfo.max_freq;
- u64 last_freq_update_time = sg_policy->last_freq_update_time;
+ unsigned long util = 0, max = 1;
unsigned int j;
- if (flags & SCHED_CPUFREQ_RT_DL)
- return max_f;
-
- sugov_iowait_boost(sg_cpu, &util, &max);
-
for_each_cpu(j, policy->cpus) {
- struct sugov_cpu *j_sg_cpu;
+ struct sugov_cpu *j_sg_cpu = &per_cpu(sugov_cpu, j);
unsigned long j_util, j_max;
s64 delta_ns;
- if (j == smp_processor_id())
- continue;
-
- j_sg_cpu = &per_cpu(sugov_cpu, j);
/*
* If the CPU utilization was last updated before the previous
* frequency update and the time elapsed between the last update
@@ -243,13 +323,13 @@ static unsigned int sugov_next_freq_shar
* enough, don't take the CPU into account as it probably is
* idle now (and clear iowait_boost for it).
*/
- delta_ns = last_freq_update_time - j_sg_cpu->last_update;
+ delta_ns = time - j_sg_cpu->last_update;
if (delta_ns > TICK_NSEC) {
j_sg_cpu->iowait_boost = 0;
continue;
}
- if (j_sg_cpu->flags & SCHED_CPUFREQ_RT_DL)
- return max_f;
+ if (j_sg_cpu->flags & SCHED_CPUFREQ_DL)
+ return policy->cpuinfo.max_freq;
j_util = j_sg_cpu->util;
j_max = j_sg_cpu->max;
@@ -261,7 +341,7 @@ static unsigned int sugov_next_freq_shar
sugov_iowait_boost(j_sg_cpu, &util, &max);
}
- return get_next_freq(sg_cpu, util, max);
+ return get_next_freq(sg_policy, util, max);
}
static void sugov_update_shared(struct update_util_data *hook, u64 time,
@@ -272,7 +352,7 @@ static void sugov_update_shared(struct u
unsigned long util, max;
unsigned int next_f;
- sugov_get_util(&util, &max);
+ sugov_get_util(&util, &max, time);
raw_spin_lock(&sg_policy->update_lock);
@@ -284,14 +364,18 @@ static void sugov_update_shared(struct u
sg_cpu->last_update = time;
if (sugov_should_update_freq(sg_policy, time)) {
- next_f = sugov_next_freq_shared(sg_cpu, util, max, flags);
+ if (flags & SCHED_CPUFREQ_DL)
+ next_f = sg_policy->policy->cpuinfo.max_freq;
+ else
+ next_f = sugov_next_freq_shared(sg_cpu, time);
+
sugov_update_commit(sg_policy, time, next_f);
}
raw_spin_unlock(&sg_policy->update_lock);
}
-static void sugov_work(struct work_struct *work)
+static void sugov_work(struct kthread_work *work)
{
struct sugov_policy *sg_policy = container_of(work, struct sugov_policy, work);
@@ -308,7 +392,21 @@ static void sugov_irq_work(struct irq_wo
struct sugov_policy *sg_policy;
sg_policy = container_of(irq_work, struct sugov