#include <linux/cpumask.h>
#include <linux/cpufreq.h>
#include <linux/module.h>
-#include <linux/mutex.h>
+#include <linux/moduleparam.h>
+#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/sched/rt.h>
#include <linux/tick.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/kthread.h>
-#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/kernel_stat.h>
+#include <asm/cputime.h>
#define CREATE_TRACE_POINTS
#include <trace/events/cpufreq_interactive.h>
-#include <asm/cputime.h>
-
-static atomic_t active_count = ATOMIC_INIT(0);
+static int active_count;
struct cpufreq_interactive_cpuinfo {
struct timer_list cpu_timer;
- int timer_idlecancel;
+ struct timer_list cpu_slack_timer;
+ spinlock_t load_lock; /* protects the next 4 fields */
u64 time_in_idle;
- u64 idle_exit_time;
- u64 timer_run_time;
- int idling;
- u64 target_set_time;
- u64 target_set_time_in_idle;
- u64 target_validate_time;
- u64 target_validate_time_in_idle;
+ u64 time_in_idle_timestamp;
+ u64 cputime_speedadj;
+ u64 cputime_speedadj_timestamp;
struct cpufreq_policy *policy;
struct cpufreq_frequency_table *freq_table;
unsigned int target_freq;
+ unsigned int floor_freq;
+ u64 floor_validate_time;
+ u64 hispeed_validate_time;
+ struct rw_semaphore enable_sem;
int governor_enabled;
};
static DEFINE_PER_CPU(struct cpufreq_interactive_cpuinfo, cpuinfo);
-/* Workqueues handle frequency scaling */
-static struct task_struct *up_task;
-static struct workqueue_struct *down_wq;
-static struct work_struct freq_scale_down_work;
-static cpumask_t up_cpumask;
-static spinlock_t up_cpumask_lock;
-static cpumask_t down_cpumask;
-static spinlock_t down_cpumask_lock;
-static struct mutex set_speed_lock;
+/* realtime thread handles frequency scaling */
+static struct task_struct *speedchange_task;
+static cpumask_t speedchange_cpumask;
+static spinlock_t speedchange_cpumask_lock;
+static struct mutex gov_lock;
/* Hi speed to bump to from lo speed when load burst (default max) */
-static u64 hispeed_freq;
+static unsigned int hispeed_freq;
/* Go to hi speed when CPU load at or above this value. */
-#define DEFAULT_GO_HISPEED_LOAD 85
-static unsigned long go_hispeed_load;
+#define DEFAULT_GO_HISPEED_LOAD 99
+static unsigned long go_hispeed_load = DEFAULT_GO_HISPEED_LOAD;
+
+/* Target load. Lower values result in higher CPU speeds. */
+#define DEFAULT_TARGET_LOAD 90
+static unsigned int default_target_loads[] = {DEFAULT_TARGET_LOAD};
+static spinlock_t target_loads_lock;
+static unsigned int *target_loads = default_target_loads;
+static int ntarget_loads = ARRAY_SIZE(default_target_loads);
/*
* The minimum amount of time to spend at a frequency before we can ramp down.
*/
#define DEFAULT_MIN_SAMPLE_TIME (80 * USEC_PER_MSEC)
-static unsigned long min_sample_time;
+static unsigned long min_sample_time = DEFAULT_MIN_SAMPLE_TIME;
/*
* The sample rate of the timer used to increase frequency
*/
#define DEFAULT_TIMER_RATE (20 * USEC_PER_MSEC)
-static unsigned long timer_rate;
+static unsigned long timer_rate = DEFAULT_TIMER_RATE;
/*
* Wait this long before raising speed above hispeed, by default a single
* timer interval.
*/
#define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE
-static unsigned long above_hispeed_delay_val;
+static unsigned int default_above_hispeed_delay[] = {
+ DEFAULT_ABOVE_HISPEED_DELAY };
+static spinlock_t above_hispeed_delay_lock;
+static unsigned int *above_hispeed_delay = default_above_hispeed_delay;
+static int nabove_hispeed_delay = ARRAY_SIZE(default_above_hispeed_delay);
+
+/* Non-zero means indefinite speed boost active */
+static int boost_val;
+/* Duration of a boot pulse in usecs */
+static int boostpulse_duration_val = DEFAULT_MIN_SAMPLE_TIME;
+/* End time of boost pulse in ktime converted to usecs */
+static u64 boostpulse_endtime;
+
+/*
+ * Max additional time to wait in idle, beyond timer_rate, at speeds above
+ * minimum before wakeup to reduce speed, or -1 if unnecessary.
+ */
+#define DEFAULT_TIMER_SLACK (4 * DEFAULT_TIMER_RATE)
+static int timer_slack_val = DEFAULT_TIMER_SLACK;
+
+static bool io_is_busy;
static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
unsigned int event);
.owner = THIS_MODULE,
};
-static void cpufreq_interactive_timer(unsigned long data)
+static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
+ cputime64_t *wall)
+{
+ u64 idle_time;
+ u64 cur_wall_time;
+ u64 busy_time;
+
+ cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
+
+ busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
+
+ idle_time = cur_wall_time - busy_time;
+ if (wall)
+ *wall = jiffies_to_usecs(cur_wall_time);
+
+ return jiffies_to_usecs(idle_time);
+}
+
+static inline cputime64_t get_cpu_idle_time(unsigned int cpu,
+ cputime64_t *wall)
+{
+ u64 idle_time = get_cpu_idle_time_us(cpu, wall);
+
+ if (idle_time == -1ULL)
+ idle_time = get_cpu_idle_time_jiffy(cpu, wall);
+ else if (!io_is_busy)
+ idle_time += get_cpu_iowait_time_us(cpu, wall);
+
+ return idle_time;
+}
+
+static void cpufreq_interactive_timer_resched(
+ struct cpufreq_interactive_cpuinfo *pcpu)
+{
+ unsigned long expires = jiffies + usecs_to_jiffies(timer_rate);
+ unsigned long flags;
+
+ mod_timer_pinned(&pcpu->cpu_timer, expires);
+ if (timer_slack_val >= 0 && pcpu->target_freq > pcpu->policy->min) {
+ expires += usecs_to_jiffies(timer_slack_val);
+ mod_timer_pinned(&pcpu->cpu_slack_timer, expires);
+ }
+
+ spin_lock_irqsave(&pcpu->load_lock, flags);
+ pcpu->time_in_idle =
+ get_cpu_idle_time(smp_processor_id(),
+ &pcpu->time_in_idle_timestamp);
+ pcpu->cputime_speedadj = 0;
+ pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
+ spin_unlock_irqrestore(&pcpu->load_lock, flags);
+}
+
+static unsigned int freq_to_above_hispeed_delay(unsigned int freq)
+{
+ int i;
+ unsigned int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&above_hispeed_delay_lock, flags);
+
+ for (i = 0; i < nabove_hispeed_delay - 1 &&
+ freq >= above_hispeed_delay[i+1]; i += 2)
+ ;
+
+ ret = above_hispeed_delay[i];
+ spin_unlock_irqrestore(&above_hispeed_delay_lock, flags);
+ return ret;
+}
+
+static unsigned int freq_to_targetload(unsigned int freq)
{
+ int i;
+ unsigned int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&target_loads_lock, flags);
+
+ for (i = 0; i < ntarget_loads - 1 && freq >= target_loads[i+1]; i += 2)
+ ;
+
+ ret = target_loads[i];
+ spin_unlock_irqrestore(&target_loads_lock, flags);
+ return ret;
+}
+
+/*
+ * If increasing frequencies never map to a lower target load then
+ * choose_freq() will find the minimum frequency that does not exceed its
+ * target load given the current load.
+ */
+
+static unsigned int choose_freq(
+ struct cpufreq_interactive_cpuinfo *pcpu, unsigned int loadadjfreq)
+{
+ unsigned int freq = pcpu->policy->cur;
+ unsigned int prevfreq, freqmin, freqmax;
+ unsigned int tl;
+ int index;
+
+ freqmin = 0;
+ freqmax = UINT_MAX;
+
+ do {
+ prevfreq = freq;
+ tl = freq_to_targetload(freq);
+
+ /*
+ * Find the lowest frequency where the computed load is less
+ * than or equal to the target load.
+ */
+
+ if (cpufreq_frequency_table_target(
+ pcpu->policy, pcpu->freq_table, loadadjfreq / tl,
+ CPUFREQ_RELATION_L, &index))
+ break;
+ freq = pcpu->freq_table[index].frequency;
+
+ if (freq > prevfreq) {
+ /* The previous frequency is too low. */
+ freqmin = prevfreq;
+
+ if (freq >= freqmax) {
+ /*
+ * Find the highest frequency that is less
+ * than freqmax.
+ */
+ if (cpufreq_frequency_table_target(
+ pcpu->policy, pcpu->freq_table,
+ freqmax - 1, CPUFREQ_RELATION_H,
+ &index))
+ break;
+ freq = pcpu->freq_table[index].frequency;
+
+ if (freq == freqmin) {
+ /*
+ * The first frequency below freqmax
+ * has already been found to be too
+ * low. freqmax is the lowest speed
+ * we found that is fast enough.
+ */
+ freq = freqmax;
+ break;
+ }
+ }
+ } else if (freq < prevfreq) {
+ /* The previous frequency is high enough. */
+ freqmax = prevfreq;
+
+ if (freq <= freqmin) {
+ /*
+ * Find the lowest frequency that is higher
+ * than freqmin.
+ */
+ if (cpufreq_frequency_table_target(
+ pcpu->policy, pcpu->freq_table,
+ freqmin + 1, CPUFREQ_RELATION_L,
+ &index))
+ break;
+ freq = pcpu->freq_table[index].frequency;
+
+ /*
+ * If freqmax is the first frequency above
+ * freqmin then we have already found that
+ * this speed is fast enough.
+ */
+ if (freq == freqmax)
+ break;
+ }
+ }
+
+ /* If same frequency chosen as previous then done. */
+ } while (freq != prevfreq);
+
+ return freq;
+}
+
+static u64 update_load(int cpu)
+{
+ struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu);
+ u64 now;
+ u64 now_idle;
unsigned int delta_idle;
unsigned int delta_time;
+ u64 active_time;
+
+ now_idle = get_cpu_idle_time(cpu, &now);
+ delta_idle = (unsigned int)(now_idle - pcpu->time_in_idle);
+ delta_time = (unsigned int)(now - pcpu->time_in_idle_timestamp);
+ active_time = delta_time - delta_idle;
+ pcpu->cputime_speedadj += active_time * pcpu->policy->cur;
+
+ pcpu->time_in_idle = now_idle;
+ pcpu->time_in_idle_timestamp = now;
+ return now;
+}
+
+static void cpufreq_interactive_timer(unsigned long data)
+{
+ u64 now;
+ unsigned int delta_time;
+ u64 cputime_speedadj;
int cpu_load;
- int load_since_change;
- u64 time_in_idle;
- u64 idle_exit_time;
struct cpufreq_interactive_cpuinfo *pcpu =
&per_cpu(cpuinfo, data);
- u64 now_idle;
unsigned int new_freq;
+ unsigned int loadadjfreq;
unsigned int index;
unsigned long flags;
+ bool boosted;
- smp_rmb();
-
+ if (!down_read_trylock(&pcpu->enable_sem))
+ return;
if (!pcpu->governor_enabled)
goto exit;
- /*
- * Once pcpu->timer_run_time is updated to >= pcpu->idle_exit_time,
- * this lets idle exit know the current idle time sample has
- * been processed, and idle exit can generate a new sample and
- * re-arm the timer. This prevents a concurrent idle
- * exit on that CPU from writing a new set of info at the same time
- * the timer function runs (the timer function can't use that info
- * until more time passes).
- */
- time_in_idle = pcpu->time_in_idle;
- idle_exit_time = pcpu->idle_exit_time;
- now_idle = get_cpu_idle_time_us(data, &pcpu->timer_run_time);
- smp_wmb();
-
- /* If we raced with cancelling a timer, skip. */
- if (!idle_exit_time)
- goto exit;
+ spin_lock_irqsave(&pcpu->load_lock, flags);
+ now = update_load(data);
+ delta_time = (unsigned int)(now - pcpu->cputime_speedadj_timestamp);
+ cputime_speedadj = pcpu->cputime_speedadj;
+ spin_unlock_irqrestore(&pcpu->load_lock, flags);
- delta_idle = (unsigned int)(now_idle - time_in_idle);
- delta_time = (unsigned int)(pcpu->timer_run_time - idle_exit_time);
-
- /*
- * If timer ran less than 1ms after short-term sample started, retry.
- */
- if (delta_time < 1000)
+ if (WARN_ON_ONCE(!delta_time))
goto rearm;
- if (delta_idle > delta_time)
- cpu_load = 0;
- else
- cpu_load = 100 * (delta_time - delta_idle) / delta_time;
-
- delta_idle = (unsigned int)(now_idle - pcpu->target_set_time_in_idle);
- delta_time = (unsigned int)(pcpu->timer_run_time -
- pcpu->target_set_time);
+ do_div(cputime_speedadj, delta_time);
+ loadadjfreq = (unsigned int)cputime_speedadj * 100;
+ cpu_load = loadadjfreq / pcpu->target_freq;
+ boosted = boost_val || now < boostpulse_endtime;
- if ((delta_time == 0) || (delta_idle > delta_time))
- load_since_change = 0;
- else
- load_since_change =
- 100 * (delta_time - delta_idle) / delta_time;
-
- /*
- * Choose greater of short-term load (since last idle timer
- * started or timer function re-armed itself) or long-term load
- * (since last frequency change).
- */
- if (load_since_change > cpu_load)
- cpu_load = load_since_change;
-
- if (cpu_load >= go_hispeed_load) {
- if (pcpu->target_freq <= pcpu->policy->min) {
+ if (cpu_load >= go_hispeed_load || boosted) {
+ if (pcpu->target_freq < hispeed_freq) {
new_freq = hispeed_freq;
} else {
- new_freq = pcpu->policy->max * cpu_load / 100;
+ new_freq = choose_freq(pcpu, loadadjfreq);
if (new_freq < hispeed_freq)
new_freq = hispeed_freq;
-
- if (pcpu->target_freq == hispeed_freq &&
- new_freq > hispeed_freq &&
- pcpu->timer_run_time - pcpu->target_set_time
- < above_hispeed_delay_val) {
- trace_cpufreq_interactive_notyet(data, cpu_load,
- pcpu->target_freq,
- new_freq);
- goto rearm;
- }
}
} else {
- new_freq = pcpu->policy->max * cpu_load / 100;
+ new_freq = choose_freq(pcpu, loadadjfreq);
}
- if (cpufreq_frequency_table_target(pcpu->policy, pcpu->freq_table,
- new_freq, CPUFREQ_RELATION_H,
- &index)) {
- pr_warn_once("timer %d: cpufreq_frequency_table_target error\n",
- (int) data);
+ if (pcpu->target_freq >= hispeed_freq &&
+ new_freq > pcpu->target_freq &&
+ now - pcpu->hispeed_validate_time <
+ freq_to_above_hispeed_delay(pcpu->target_freq)) {
+ trace_cpufreq_interactive_notyet(
+ data, cpu_load, pcpu->target_freq,
+ pcpu->policy->cur, new_freq);
goto rearm;
}
+ pcpu->hispeed_validate_time = now;
+
+ if (cpufreq_frequency_table_target(pcpu->policy, pcpu->freq_table,
+ new_freq, CPUFREQ_RELATION_L,
+ &index))
+ goto rearm;
+
new_freq = pcpu->freq_table[index].frequency;
/*
- * Do not scale down unless we have been at this frequency for the
- * minimum sample time since last validated.
+ * Do not scale below floor_freq unless we have been at or above the
+ * floor frequency for the minimum sample time since last validated.
*/
- if (new_freq < pcpu->target_freq) {
- if (pcpu->timer_run_time - pcpu->target_validate_time
- < min_sample_time) {
- trace_cpufreq_interactive_notyet(data, cpu_load,
- pcpu->target_freq, new_freq);
+ if (new_freq < pcpu->floor_freq) {
+ if (now - pcpu->floor_validate_time < min_sample_time) {
+ trace_cpufreq_interactive_notyet(
+ data, cpu_load, pcpu->target_freq,
+ pcpu->policy->cur, new_freq);
goto rearm;
}
}
- pcpu->target_validate_time_in_idle = now_idle;
- pcpu->target_validate_time = pcpu->timer_run_time;
+ /*
+ * Update the timestamp for checking whether speed has been held at
+ * or above the selected frequency for a minimum of min_sample_time,
+ * if not boosted to hispeed_freq. If boosted to hispeed_freq then we
+ * allow the speed to drop as soon as the boostpulse duration expires
+ * (or the indefinite boost is turned off).
+ */
+
+ if (!boosted || new_freq > hispeed_freq) {
+ pcpu->floor_freq = new_freq;
+ pcpu->floor_validate_time = now;
+ }
if (pcpu->target_freq == new_freq) {
- trace_cpufreq_interactive_already(data, cpu_load,
- pcpu->target_freq, new_freq);
+ trace_cpufreq_interactive_already(
+ data, cpu_load, pcpu->target_freq,
+ pcpu->policy->cur, new_freq);
goto rearm_if_notmax;
}
trace_cpufreq_interactive_target(data, cpu_load, pcpu->target_freq,
- new_freq);
- pcpu->target_set_time_in_idle = now_idle;
- pcpu->target_set_time = pcpu->timer_run_time;
-
- if (new_freq < pcpu->target_freq) {
- pcpu->target_freq = new_freq;
- spin_lock_irqsave(&down_cpumask_lock, flags);
- cpumask_set_cpu(data, &down_cpumask);
- spin_unlock_irqrestore(&down_cpumask_lock, flags);
- queue_work(down_wq, &freq_scale_down_work);
- } else {
- pcpu->target_freq = new_freq;
- spin_lock_irqsave(&up_cpumask_lock, flags);
- cpumask_set_cpu(data, &up_cpumask);
- spin_unlock_irqrestore(&up_cpumask_lock, flags);
- wake_up_process(up_task);
- }
+ pcpu->policy->cur, new_freq);
+
+ pcpu->target_freq = new_freq;
+ spin_lock_irqsave(&speedchange_cpumask_lock, flags);
+ cpumask_set_cpu(data, &speedchange_cpumask);
+ spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
+ wake_up_process(speedchange_task);
rearm_if_notmax:
/*
goto exit;
rearm:
- if (!timer_pending(&pcpu->cpu_timer)) {
- /*
- * If already at min: if that CPU is idle, don't set timer.
- * Else cancel the timer if that CPU goes idle. We don't
- * need to re-evaluate speed until the next idle exit.
- */
- if (pcpu->target_freq == pcpu->policy->min) {
- smp_rmb();
-
- if (pcpu->idling)
- goto exit;
-
- pcpu->timer_idlecancel = 1;
- }
-
- pcpu->time_in_idle = get_cpu_idle_time_us(
- data, &pcpu->idle_exit_time);
- mod_timer(&pcpu->cpu_timer,
- jiffies + usecs_to_jiffies(timer_rate));
- }
+ if (!timer_pending(&pcpu->cpu_timer))
+ cpufreq_interactive_timer_resched(pcpu);
exit:
+ up_read(&pcpu->enable_sem);
return;
}
&per_cpu(cpuinfo, smp_processor_id());
int pending;
- if (!pcpu->governor_enabled)
+ if (!down_read_trylock(&pcpu->enable_sem))
+ return;
+ if (!pcpu->governor_enabled) {
+ up_read(&pcpu->enable_sem);
return;
+ }
- pcpu->idling = 1;
- smp_wmb();
pending = timer_pending(&pcpu->cpu_timer);
if (pcpu->target_freq != pcpu->policy->min) {
-#ifdef CONFIG_SMP
/*
* Entering idle while not at lowest speed. On some
* platforms this can hold the other CPU(s) at that speed
* min indefinitely. This should probably be a quirk of
* the CPUFreq driver.
*/
- if (!pending) {
- pcpu->time_in_idle = get_cpu_idle_time_us(
- smp_processor_id(), &pcpu->idle_exit_time);
- pcpu->timer_idlecancel = 0;
- mod_timer(&pcpu->cpu_timer,
- jiffies + usecs_to_jiffies(timer_rate));
- }
-#endif
- } else {
- /*
- * If at min speed and entering idle after load has
- * already been evaluated, and a timer has been set just in
- * case the CPU suddenly goes busy, cancel that timer. The
- * CPU didn't go busy; we'll recheck things upon idle exit.
- */
- if (pending && pcpu->timer_idlecancel) {
- del_timer(&pcpu->cpu_timer);
- /*
- * Ensure last timer run time is after current idle
- * sample start time, so next idle exit will always
- * start a new idle sampling period.
- */
- pcpu->idle_exit_time = 0;
- pcpu->timer_idlecancel = 0;
- }
+ if (!pending)
+ cpufreq_interactive_timer_resched(pcpu);
}
+ up_read(&pcpu->enable_sem);
}
static void cpufreq_interactive_idle_end(void)
struct cpufreq_interactive_cpuinfo *pcpu =
&per_cpu(cpuinfo, smp_processor_id());
- pcpu->idling = 0;
- smp_wmb();
+ if (!down_read_trylock(&pcpu->enable_sem))
+ return;
+ if (!pcpu->governor_enabled) {
+ up_read(&pcpu->enable_sem);
+ return;
+ }
- /*
- * Arm the timer for 1-2 ticks later if not already, and if the timer
- * function has already processed the previous load sampling
- * interval. (If the timer is not pending but has not processed
- * the previous interval, it is probably racing with us on another
- * CPU. Let it compute load based on the previous sample and then
- * re-arm the timer for another interval when it's done, rather
- * than updating the interval start time to be "now", which doesn't
- * give the timer function enough time to make a decision on this
- * run.)
- */
- if (timer_pending(&pcpu->cpu_timer) == 0 &&
- pcpu->timer_run_time >= pcpu->idle_exit_time &&
- pcpu->governor_enabled) {
- pcpu->time_in_idle =
- get_cpu_idle_time_us(smp_processor_id(),
- &pcpu->idle_exit_time);
- pcpu->timer_idlecancel = 0;
- mod_timer(&pcpu->cpu_timer,
- jiffies + usecs_to_jiffies(timer_rate));
+ /* Arm the timer for 1-2 ticks later if not already. */
+ if (!timer_pending(&pcpu->cpu_timer)) {
+ cpufreq_interactive_timer_resched(pcpu);
+ } else if (time_after_eq(jiffies, pcpu->cpu_timer.expires)) {
+ del_timer(&pcpu->cpu_timer);
+ del_timer(&pcpu->cpu_slack_timer);
+ cpufreq_interactive_timer(smp_processor_id());
}
+ up_read(&pcpu->enable_sem);
}
-static int cpufreq_interactive_up_task(void *data)
+static int cpufreq_interactive_speedchange_task(void *data)
{
unsigned int cpu;
cpumask_t tmp_mask;
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
- spin_lock_irqsave(&up_cpumask_lock, flags);
+ spin_lock_irqsave(&speedchange_cpumask_lock, flags);
- if (cpumask_empty(&up_cpumask)) {
- spin_unlock_irqrestore(&up_cpumask_lock, flags);
+ if (cpumask_empty(&speedchange_cpumask)) {
+ spin_unlock_irqrestore(&speedchange_cpumask_lock,
+ flags);
schedule();
if (kthread_should_stop())
break;
- spin_lock_irqsave(&up_cpumask_lock, flags);
+ spin_lock_irqsave(&speedchange_cpumask_lock, flags);
}
set_current_state(TASK_RUNNING);
- tmp_mask = up_cpumask;
- cpumask_clear(&up_cpumask);
- spin_unlock_irqrestore(&up_cpumask_lock, flags);
+ tmp_mask = speedchange_cpumask;
+ cpumask_clear(&speedchange_cpumask);
+ spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
for_each_cpu(cpu, &tmp_mask) {
unsigned int j;
unsigned int max_freq = 0;
pcpu = &per_cpu(cpuinfo, cpu);
- smp_rmb();
-
- if (!pcpu->governor_enabled)
+ if (!down_read_trylock(&pcpu->enable_sem))
continue;
-
- mutex_lock(&set_speed_lock);
+ if (!pcpu->governor_enabled) {
+ up_read(&pcpu->enable_sem);
+ continue;
+ }
for_each_cpu(j, pcpu->policy->cpus) {
struct cpufreq_interactive_cpuinfo *pjcpu =
__cpufreq_driver_target(pcpu->policy,
max_freq,
CPUFREQ_RELATION_H);
- mutex_unlock(&set_speed_lock);
- trace_cpufreq_interactive_up(cpu, pcpu->target_freq,
+ trace_cpufreq_interactive_setspeed(cpu,
+ pcpu->target_freq,
pcpu->policy->cur);
+
+ up_read(&pcpu->enable_sem);
}
}
return 0;
}
-static void cpufreq_interactive_freq_down(struct work_struct *work)
+static void cpufreq_interactive_boost(void)
{
- unsigned int cpu;
- cpumask_t tmp_mask;
+ int i;
+ int anyboost = 0;
unsigned long flags;
struct cpufreq_interactive_cpuinfo *pcpu;
- spin_lock_irqsave(&down_cpumask_lock, flags);
- tmp_mask = down_cpumask;
- cpumask_clear(&down_cpumask);
- spin_unlock_irqrestore(&down_cpumask_lock, flags);
+ spin_lock_irqsave(&speedchange_cpumask_lock, flags);
+
+ for_each_online_cpu(i) {
+ pcpu = &per_cpu(cpuinfo, i);
+
+ if (pcpu->target_freq < hispeed_freq) {
+ pcpu->target_freq = hispeed_freq;
+ cpumask_set_cpu(i, &speedchange_cpumask);
+ pcpu->hispeed_validate_time =
+ ktime_to_us(ktime_get());
+ anyboost = 1;
+ }
- for_each_cpu(cpu, &tmp_mask) {
- unsigned int j;
- unsigned int max_freq = 0;
+ /*
+ * Set floor freq and (re)start timer for when last
+ * validated.
+ */
- pcpu = &per_cpu(cpuinfo, cpu);
- smp_rmb();
+ pcpu->floor_freq = hispeed_freq;
+ pcpu->floor_validate_time = ktime_to_us(ktime_get());
+ }
- if (!pcpu->governor_enabled)
- continue;
+ spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
- mutex_lock(&set_speed_lock);
+ if (anyboost)
+ wake_up_process(speedchange_task);
+}
- for_each_cpu(j, pcpu->policy->cpus) {
- struct cpufreq_interactive_cpuinfo *pjcpu =
- &per_cpu(cpuinfo, j);
+static int cpufreq_interactive_notifier(
+ struct notifier_block *nb, unsigned long val, void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ struct cpufreq_interactive_cpuinfo *pcpu;
+ int cpu;
+ unsigned long flags;
- if (pjcpu->target_freq > max_freq)
- max_freq = pjcpu->target_freq;
+ if (val == CPUFREQ_POSTCHANGE) {
+ pcpu = &per_cpu(cpuinfo, freq->cpu);
+ if (!down_read_trylock(&pcpu->enable_sem))
+ return 0;
+ if (!pcpu->governor_enabled) {
+ up_read(&pcpu->enable_sem);
+ return 0;
}
- if (max_freq != pcpu->policy->cur)
- __cpufreq_driver_target(pcpu->policy, max_freq,
- CPUFREQ_RELATION_H);
+ for_each_cpu(cpu, pcpu->policy->cpus) {
+ struct cpufreq_interactive_cpuinfo *pjcpu =
+ &per_cpu(cpuinfo, cpu);
+ spin_lock_irqsave(&pjcpu->load_lock, flags);
+ update_load(cpu);
+ spin_unlock_irqrestore(&pjcpu->load_lock, flags);
+ }
- mutex_unlock(&set_speed_lock);
- trace_cpufreq_interactive_down(cpu, pcpu->target_freq,
- pcpu->policy->cur);
+ up_read(&pcpu->enable_sem);
}
+ return 0;
}
+static struct notifier_block cpufreq_notifier_block = {
+ .notifier_call = cpufreq_interactive_notifier,
+};
+
+static unsigned int *get_tokenized_data(const char *buf, int *num_tokens)
+{
+ const char *cp;
+ int i;
+ int ntokens = 1;
+ unsigned int *tokenized_data;
+ int err = -EINVAL;
+
+ cp = buf;
+ while ((cp = strpbrk(cp + 1, " :")))
+ ntokens++;
+
+ if (!(ntokens & 0x1))
+ goto err;
+
+ tokenized_data = kmalloc(ntokens * sizeof(unsigned int), GFP_KERNEL);
+ if (!tokenized_data) {
+ err = -ENOMEM;
+ goto err;
+ }
+
+ cp = buf;
+ i = 0;
+ while (i < ntokens) {
+ if (sscanf(cp, "%u", &tokenized_data[i++]) != 1)
+ goto err_kfree;
+
+ cp = strpbrk(cp, " :");
+ if (!cp)
+ break;
+ cp++;
+ }
+
+ if (i != ntokens)
+ goto err_kfree;
+
+ *num_tokens = ntokens;
+ return tokenized_data;
+
+err_kfree:
+ kfree(tokenized_data);
+err:
+ return ERR_PTR(err);
+}
+
+static ssize_t show_target_loads(
+ struct kobject *kobj, struct attribute *attr, char *buf)
+{
+ int i;
+ ssize_t ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&target_loads_lock, flags);
+
+ for (i = 0; i < ntarget_loads; i++)
+ ret += sprintf(buf + ret, "%u%s", target_loads[i],
+ i & 0x1 ? ":" : " ");
+
+ ret += sprintf(buf + ret, "\n");
+ spin_unlock_irqrestore(&target_loads_lock, flags);
+ return ret;
+}
+
+static ssize_t store_target_loads(
+ struct kobject *kobj, struct attribute *attr, const char *buf,
+ size_t count)
+{
+ int ntokens;
+ unsigned int *new_target_loads = NULL;
+ unsigned long flags;
+
+ new_target_loads = get_tokenized_data(buf, &ntokens);
+ if (IS_ERR(new_target_loads))
+ return PTR_RET(new_target_loads);
+
+ spin_lock_irqsave(&target_loads_lock, flags);
+ if (target_loads != default_target_loads)
+ kfree(target_loads);
+ target_loads = new_target_loads;
+ ntarget_loads = ntokens;
+ spin_unlock_irqrestore(&target_loads_lock, flags);
+ return count;
+}
+
+static struct global_attr target_loads_attr =
+ __ATTR(target_loads, S_IRUGO | S_IWUSR,
+ show_target_loads, store_target_loads);
+
+static ssize_t show_above_hispeed_delay(
+ struct kobject *kobj, struct attribute *attr, char *buf)
+{
+ int i;
+ ssize_t ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&above_hispeed_delay_lock, flags);
+
+ for (i = 0; i < nabove_hispeed_delay; i++)
+ ret += sprintf(buf + ret, "%u%s", above_hispeed_delay[i],
+ i & 0x1 ? ":" : " ");
+
+ ret += sprintf(buf + ret, "\n");
+ spin_unlock_irqrestore(&above_hispeed_delay_lock, flags);
+ return ret;
+}
+
+static ssize_t store_above_hispeed_delay(
+ struct kobject *kobj, struct attribute *attr, const char *buf,
+ size_t count)
+{
+ int ntokens;
+ unsigned int *new_above_hispeed_delay = NULL;
+ unsigned long flags;
+
+ new_above_hispeed_delay = get_tokenized_data(buf, &ntokens);
+ if (IS_ERR(new_above_hispeed_delay))
+ return PTR_RET(new_above_hispeed_delay);
+
+ spin_lock_irqsave(&above_hispeed_delay_lock, flags);
+ if (above_hispeed_delay != default_above_hispeed_delay)
+ kfree(above_hispeed_delay);
+ above_hispeed_delay = new_above_hispeed_delay;
+ nabove_hispeed_delay = ntokens;
+ spin_unlock_irqrestore(&above_hispeed_delay_lock, flags);
+ return count;
+
+}
+
+static struct global_attr above_hispeed_delay_attr =
+ __ATTR(above_hispeed_delay, S_IRUGO | S_IWUSR,
+ show_above_hispeed_delay, store_above_hispeed_delay);
+
static ssize_t show_hispeed_freq(struct kobject *kobj,
struct attribute *attr, char *buf)
{
- return sprintf(buf, "%llu\n", hispeed_freq);
+ return sprintf(buf, "%u\n", hispeed_freq);
}
static ssize_t store_hispeed_freq(struct kobject *kobj,
size_t count)
{
int ret;
- u64 val;
+ long unsigned int val;
- ret = strict_strtoull(buf, 0, &val);
+ ret = strict_strtoul(buf, 0, &val);
if (ret < 0)
return ret;
hispeed_freq = val;
static struct global_attr min_sample_time_attr = __ATTR(min_sample_time, 0644,
show_min_sample_time, store_min_sample_time);
-static ssize_t show_above_hispeed_delay(struct kobject *kobj,
- struct attribute *attr, char *buf)
+static ssize_t show_timer_rate(struct kobject *kobj,
+ struct attribute *attr, char *buf)
{
- return sprintf(buf, "%lu\n", above_hispeed_delay_val);
+ return sprintf(buf, "%lu\n", timer_rate);
}
-static ssize_t store_above_hispeed_delay(struct kobject *kobj,
- struct attribute *attr,
- const char *buf, size_t count)
+static ssize_t store_timer_rate(struct kobject *kobj,
+ struct attribute *attr, const char *buf, size_t count)
{
int ret;
unsigned long val;
ret = strict_strtoul(buf, 0, &val);
if (ret < 0)
return ret;
- above_hispeed_delay_val = val;
+ timer_rate = val;
return count;
}
-define_one_global_rw(above_hispeed_delay);
+static struct global_attr timer_rate_attr = __ATTR(timer_rate, 0644,
+ show_timer_rate, store_timer_rate);
-static ssize_t show_timer_rate(struct kobject *kobj,
+static ssize_t show_timer_slack(
+ struct kobject *kobj, struct attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", timer_slack_val);
+}
+
+static ssize_t store_timer_slack(
+ struct kobject *kobj, struct attribute *attr, const char *buf,
+ size_t count)
+{
+ int ret;
+ unsigned long val;
+
+ ret = kstrtol(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ timer_slack_val = val;
+ return count;
+}
+
+define_one_global_rw(timer_slack);
+
+static ssize_t show_boost(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", boost_val);
+}
+
+static ssize_t store_boost(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long val;
+
+ ret = kstrtoul(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+
+ boost_val = val;
+
+ if (boost_val) {
+ trace_cpufreq_interactive_boost("on");
+ cpufreq_interactive_boost();
+ } else {
+ trace_cpufreq_interactive_unboost("off");
+ }
+
+ return count;
+}
+
+define_one_global_rw(boost);
+
+static ssize_t store_boostpulse(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ unsigned long val;
+
+ ret = kstrtoul(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+
+ boostpulse_endtime = ktime_to_us(ktime_get()) + boostpulse_duration_val;
+ trace_cpufreq_interactive_boost("pulse");
+ cpufreq_interactive_boost();
+ return count;
+}
+
+static struct global_attr boostpulse =
+ __ATTR(boostpulse, 0200, NULL, store_boostpulse);
+
+static ssize_t show_boostpulse_duration(
+ struct kobject *kobj, struct attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", boostpulse_duration_val);
+}
+
+static ssize_t store_boostpulse_duration(
+ struct kobject *kobj, struct attribute *attr, const char *buf,
+ size_t count)
+{
+ int ret;
+ unsigned long val;
+
+ ret = kstrtoul(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+
+ boostpulse_duration_val = val;
+ return count;
+}
+
+define_one_global_rw(boostpulse_duration);
+
+static ssize_t show_io_is_busy(struct kobject *kobj,
struct attribute *attr, char *buf)
{
- return sprintf(buf, "%lu\n", timer_rate);
+ return sprintf(buf, "%u\n", io_is_busy);
}
-static ssize_t store_timer_rate(struct kobject *kobj,
+static ssize_t store_io_is_busy(struct kobject *kobj,
struct attribute *attr, const char *buf, size_t count)
{
int ret;
unsigned long val;
- ret = strict_strtoul(buf, 0, &val);
+ ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
- timer_rate = val;
+ io_is_busy = val;
return count;
}
-static struct global_attr timer_rate_attr = __ATTR(timer_rate, 0644,
- show_timer_rate, store_timer_rate);
+static struct global_attr io_is_busy_attr = __ATTR(io_is_busy, 0644,
+ show_io_is_busy, store_io_is_busy);
static struct attribute *interactive_attributes[] = {
+ &target_loads_attr.attr,
+ &above_hispeed_delay_attr.attr,
&hispeed_freq_attr.attr,
&go_hispeed_load_attr.attr,
- &above_hispeed_delay.attr,
&min_sample_time_attr.attr,
&timer_rate_attr.attr,
+ &timer_slack.attr,
+ &boost.attr,
+ &boostpulse.attr,
+ &boostpulse_duration.attr,
+ &io_is_busy_attr.attr,
NULL,
};
.name = "interactive",
};
+static int cpufreq_interactive_idle_notifier(struct notifier_block *nb,
+ unsigned long val,
+ void *data)
+{
+ switch (val) {
+ case IDLE_START:
+ cpufreq_interactive_idle_start();
+ break;
+ case IDLE_END:
+ cpufreq_interactive_idle_end();
+ break;
+ }
+
+ return 0;
+}
+
+static struct notifier_block cpufreq_interactive_idle_nb = {
+ .notifier_call = cpufreq_interactive_idle_notifier,
+};
+
static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
unsigned int event)
{
if (!cpu_online(policy->cpu))
return -EINVAL;
+ mutex_lock(&gov_lock);
+
freq_table =
cpufreq_frequency_get_table(policy->cpu);
+ if (!hispeed_freq)
+ hispeed_freq = policy->max;
for_each_cpu(j, policy->cpus) {
+ unsigned long expires;
+
pcpu = &per_cpu(cpuinfo, j);
pcpu->policy = policy;
pcpu->target_freq = policy->cur;
pcpu->freq_table = freq_table;
- pcpu->target_set_time_in_idle =
- get_cpu_idle_time_us(j,
- &pcpu->target_set_time);
- pcpu->target_validate_time =
- pcpu->target_set_time;
- pcpu->target_validate_time_in_idle =
- pcpu->target_set_time_in_idle;
+ pcpu->floor_freq = pcpu->target_freq;
+ pcpu->floor_validate_time =
+ ktime_to_us(ktime_get());
+ pcpu->hispeed_validate_time =
+ pcpu->floor_validate_time;
+ down_write(&pcpu->enable_sem);
+ expires = jiffies + usecs_to_jiffies(timer_rate);
+ pcpu->cpu_timer.expires = expires;
+ add_timer_on(&pcpu->cpu_timer, j);
+ if (timer_slack_val >= 0) {
+ expires += usecs_to_jiffies(timer_slack_val);
+ pcpu->cpu_slack_timer.expires = expires;
+ add_timer_on(&pcpu->cpu_slack_timer, j);
+ }
pcpu->governor_enabled = 1;
- smp_wmb();
+ up_write(&pcpu->enable_sem);
}
- if (!hispeed_freq)
- hispeed_freq = policy->max;
-
/*
* Do not register the idle hook and create sysfs
* entries if we have already done so.
*/
- if (atomic_inc_return(&active_count) > 1)
+ if (++active_count > 1) {
+ mutex_unlock(&gov_lock);
return 0;
+ }
rc = sysfs_create_group(cpufreq_global_kobject,
&interactive_attr_group);
- if (rc)
+ if (rc) {
+ mutex_unlock(&gov_lock);
return rc;
+ }
+ idle_notifier_register(&cpufreq_interactive_idle_nb);
+ cpufreq_register_notifier(
+ &cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
+ mutex_unlock(&gov_lock);
break;
case CPUFREQ_GOV_STOP:
+ mutex_lock(&gov_lock);
for_each_cpu(j, policy->cpus) {
pcpu = &per_cpu(cpuinfo, j);
+ down_write(&pcpu->enable_sem);
pcpu->governor_enabled = 0;
- smp_wmb();
del_timer_sync(&pcpu->cpu_timer);
-
- /*
- * Reset idle exit time since we may cancel the timer
- * before it can run after the last idle exit time,
- * to avoid tripping the check in idle exit for a timer
- * that is trying to run.
- */
- pcpu->idle_exit_time = 0;
+ del_timer_sync(&pcpu->cpu_slack_timer);
+ up_write(&pcpu->enable_sem);
}
- flush_work(&freq_scale_down_work);
- if (atomic_dec_return(&active_count) > 0)
+ if (--active_count > 0) {
+ mutex_unlock(&gov_lock);
return 0;
+ }
+ cpufreq_unregister_notifier(
+ &cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
+ idle_notifier_unregister(&cpufreq_interactive_idle_nb);
sysfs_remove_group(cpufreq_global_kobject,
&interactive_attr_group);
+ mutex_unlock(&gov_lock);
break;
return 0;
}
-static int cpufreq_interactive_idle_notifier(struct notifier_block *nb,
- unsigned long val,
- void *data)
+static void cpufreq_interactive_nop_timer(unsigned long data)
{
- switch (val) {
- case IDLE_START:
- cpufreq_interactive_idle_start();
- break;
- case IDLE_END:
- cpufreq_interactive_idle_end();
- break;
- }
-
- return 0;
}
-static struct notifier_block cpufreq_interactive_idle_nb = {
- .notifier_call = cpufreq_interactive_idle_notifier,
-};
-
static int __init cpufreq_interactive_init(void)
{
unsigned int i;
struct cpufreq_interactive_cpuinfo *pcpu;
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
- go_hispeed_load = DEFAULT_GO_HISPEED_LOAD;
- min_sample_time = DEFAULT_MIN_SAMPLE_TIME;
- above_hispeed_delay_val = DEFAULT_ABOVE_HISPEED_DELAY;
- timer_rate = DEFAULT_TIMER_RATE;
-
/* Initalize per-cpu timers */
for_each_possible_cpu(i) {
pcpu = &per_cpu(cpuinfo, i);
- init_timer(&pcpu->cpu_timer);
+ init_timer_deferrable(&pcpu->cpu_timer);
pcpu->cpu_timer.function = cpufreq_interactive_timer;
pcpu->cpu_timer.data = i;
+ init_timer(&pcpu->cpu_slack_timer);
+ pcpu->cpu_slack_timer.function = cpufreq_interactive_nop_timer;
+ spin_lock_init(&pcpu->load_lock);
+ init_rwsem(&pcpu->enable_sem);
}
- up_task = kthread_create(cpufreq_interactive_up_task, NULL,
- "kinteractiveup");
- if (IS_ERR(up_task))
- return PTR_ERR(up_task);
-
- sched_setscheduler_nocheck(up_task, SCHED_FIFO, ¶m);
- get_task_struct(up_task);
+ spin_lock_init(&target_loads_lock);
+ spin_lock_init(&speedchange_cpumask_lock);
+ spin_lock_init(&above_hispeed_delay_lock);
+ mutex_init(&gov_lock);
+ speedchange_task =
+ kthread_create(cpufreq_interactive_speedchange_task, NULL,
+ "cfinteractive");
+ if (IS_ERR(speedchange_task))
+ return PTR_ERR(speedchange_task);
- /* No rescuer thread, bind to CPU queuing the work for possibly
- warm cache (probably doesn't matter much). */
- down_wq = alloc_workqueue("knteractive_down", 0, 1);
+ sched_setscheduler_nocheck(speedchange_task, SCHED_FIFO, ¶m);
+ get_task_struct(speedchange_task);
- if (!down_wq)
- goto err_freeuptask;
-
- INIT_WORK(&freq_scale_down_work,
- cpufreq_interactive_freq_down);
-
- spin_lock_init(&up_cpumask_lock);
- spin_lock_init(&down_cpumask_lock);
- mutex_init(&set_speed_lock);
-
- idle_notifier_register(&cpufreq_interactive_idle_nb);
+ /* NB: wake up so the thread does not look hung to the freezer */
+ wake_up_process(speedchange_task);
return cpufreq_register_governor(&cpufreq_gov_interactive);
-
-err_freeuptask:
- put_task_struct(up_task);
- return -ENOMEM;
}
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE
static void __exit cpufreq_interactive_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_interactive);
- kthread_stop(up_task);
- put_task_struct(up_task);
- destroy_workqueue(down_wq);
+ kthread_stop(speedchange_task);
+ put_task_struct(speedchange_task);
}
module_exit(cpufreq_interactive_exit);
projects / firefly-linux-kernel-4.4.55.git / blobdiff