#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/slab.h>
-#include <linux/input.h>
#include <asm/cputime.h>
#define CREATE_TRACE_POINTS
int timer_idlecancel;
u64 time_in_idle;
u64 idle_exit_time;
- u64 timer_run_time;
- int idling;
u64 target_set_time;
u64 target_set_time_in_idle;
struct cpufreq_policy *policy;
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;
/* 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
#define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE
static unsigned long above_hispeed_delay_val;
-/*
- * Boost pulse to hispeed on touchscreen input.
- */
-
-static int input_boost_val;
-
-struct cpufreq_interactive_inputopen {
- struct input_handle *handle;
- struct work_struct inputopen_work;
-};
-
-static struct cpufreq_interactive_inputopen inputopen;
-
/*
* Non-zero means longer-term speed boost active.
*/
static void cpufreq_interactive_timer(unsigned long data)
{
+ u64 now;
unsigned int delta_idle;
unsigned int delta_time;
int cpu_load;
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;
-
+ now_idle = get_cpu_idle_time_us(data, &now);
delta_idle = (unsigned int)(now_idle - time_in_idle);
- delta_time = (unsigned int)(pcpu->timer_run_time - idle_exit_time);
+ delta_time = (unsigned int)(now - idle_exit_time);
/*
* If timer ran less than 1ms after short-term sample started, retry.
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);
+ delta_time = (unsigned int)(now - pcpu->target_set_time);
if ((delta_time == 0) || (delta_idle > delta_time))
load_since_change = 0;
cpu_load = load_since_change;
if (cpu_load >= go_hispeed_load || boost_val) {
- if (pcpu->target_freq <= pcpu->policy->min) {
+ if (pcpu->target_freq < hispeed_freq &&
+ hispeed_freq < pcpu->policy->max) {
new_freq = hispeed_freq;
} else {
new_freq = pcpu->policy->max * cpu_load / 100;
if (pcpu->target_freq == hispeed_freq &&
new_freq > hispeed_freq &&
- pcpu->timer_run_time - pcpu->hispeed_validate_time
+ now - pcpu->hispeed_validate_time
< above_hispeed_delay_val) {
trace_cpufreq_interactive_notyet(data, cpu_load,
pcpu->target_freq,
}
}
} else {
- new_freq = pcpu->policy->max * cpu_load / 100;
+ new_freq = hispeed_freq * cpu_load / 100;
}
if (new_freq <= hispeed_freq)
- pcpu->hispeed_validate_time = pcpu->timer_run_time;
+ pcpu->hispeed_validate_time = now;
if (cpufreq_frequency_table_target(pcpu->policy, pcpu->freq_table,
new_freq, CPUFREQ_RELATION_H,
* floor frequency for the minimum sample time since last validated.
*/
if (new_freq < pcpu->floor_freq) {
- if (pcpu->timer_run_time - pcpu->floor_validate_time
- < min_sample_time) {
+ if (now - pcpu->floor_validate_time < min_sample_time) {
trace_cpufreq_interactive_notyet(data, cpu_load,
pcpu->target_freq, new_freq);
goto rearm;
}
pcpu->floor_freq = new_freq;
- pcpu->floor_validate_time = pcpu->timer_run_time;
+ pcpu->floor_validate_time = now;
if (pcpu->target_freq == new_freq) {
trace_cpufreq_interactive_already(data, cpu_load,
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->target_set_time = now;
+
+ 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:
/*
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 already at min, 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;
-
+ if (pcpu->target_freq == pcpu->policy->min)
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));
+ mod_timer_pinned(&pcpu->cpu_timer,
+ jiffies + usecs_to_jiffies(timer_rate));
}
exit:
if (!pcpu->governor_enabled)
return;
- pcpu->idling = 1;
- smp_wmb();
pending = timer_pending(&pcpu->cpu_timer);
if (pcpu->target_freq != pcpu->policy->min) {
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));
+ mod_timer_pinned(
+ &pcpu->cpu_timer,
+ jiffies + usecs_to_jiffies(timer_rate));
}
#endif
} else {
*/
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 (!pcpu->governor_enabled)
return;
- pcpu->idling = 0;
- smp_wmb();
-
- /*
- * 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) {
+ /* Arm the timer for 1-2 ticks later if not already. */
+ if (!timer_pending(&pcpu->cpu_timer)) {
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));
+ mod_timer_pinned(
+ &pcpu->cpu_timer,
+ jiffies + usecs_to_jiffies(timer_rate));
}
}
-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;
if (!pcpu->governor_enabled)
continue;
- mutex_lock(&set_speed_lock);
-
for_each_cpu(j, pcpu->policy->cpus) {
struct cpufreq_interactive_cpuinfo *pjcpu =
&per_cpu(cpuinfo, j);
__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);
}
}
return 0;
}
-static void cpufreq_interactive_freq_down(struct work_struct *work)
-{
- unsigned int cpu;
- cpumask_t tmp_mask;
- 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);
-
- 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)
- continue;
-
- mutex_lock(&set_speed_lock);
-
- for_each_cpu(j, pcpu->policy->cpus) {
- struct cpufreq_interactive_cpuinfo *pjcpu =
- &per_cpu(cpuinfo, j);
-
- if (pjcpu->target_freq > max_freq)
- max_freq = pjcpu->target_freq;
- }
-
- if (max_freq != pcpu->policy->cur)
- __cpufreq_driver_target(pcpu->policy, max_freq,
- CPUFREQ_RELATION_H);
-
- mutex_unlock(&set_speed_lock);
- trace_cpufreq_interactive_down(cpu, pcpu->target_freq,
- pcpu->policy->cur);
- }
-}
-
static void cpufreq_interactive_boost(void)
{
int i;
unsigned long flags;
struct cpufreq_interactive_cpuinfo *pcpu;
- spin_lock_irqsave(&up_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, &up_cpumask);
+ cpumask_set_cpu(i, &speedchange_cpumask);
pcpu->target_set_time_in_idle =
get_cpu_idle_time_us(i, &pcpu->target_set_time);
pcpu->hispeed_validate_time = pcpu->target_set_time;
pcpu->floor_validate_time = ktime_to_us(ktime_get());
}
- spin_unlock_irqrestore(&up_cpumask_lock, flags);
+ spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
if (anyboost)
- wake_up_process(up_task);
-}
-
-/*
- * Pulsed boost on input event raises CPUs to hispeed_freq and lets
- * usual algorithm of min_sample_time decide when to allow speed
- * to drop.
- */
-
-static void cpufreq_interactive_input_event(struct input_handle *handle,
- unsigned int type,
- unsigned int code, int value)
-{
- if (input_boost_val && type == EV_SYN && code == SYN_REPORT) {
- trace_cpufreq_interactive_boost("input");
- cpufreq_interactive_boost();
- }
-}
-
-static void cpufreq_interactive_input_open(struct work_struct *w)
-{
- struct cpufreq_interactive_inputopen *io =
- container_of(w, struct cpufreq_interactive_inputopen,
- inputopen_work);
- int error;
-
- error = input_open_device(io->handle);
- if (error)
- input_unregister_handle(io->handle);
-}
-
-static int cpufreq_interactive_input_connect(struct input_handler *handler,
- struct input_dev *dev,
- const struct input_device_id *id)
-{
- struct input_handle *handle;
- int error;
-
- pr_info("%s: connect to %s\n", __func__, dev->name);
- handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
- if (!handle)
- return -ENOMEM;
-
- handle->dev = dev;
- handle->handler = handler;
- handle->name = "cpufreq_interactive";
-
- error = input_register_handle(handle);
- if (error)
- goto err;
-
- inputopen.handle = handle;
- queue_work(down_wq, &inputopen.inputopen_work);
- return 0;
-err:
- kfree(handle);
- return error;
-}
-
-static void cpufreq_interactive_input_disconnect(struct input_handle *handle)
-{
- input_close_device(handle);
- input_unregister_handle(handle);
- kfree(handle);
+ wake_up_process(speedchange_task);
}
-static const struct input_device_id cpufreq_interactive_ids[] = {
- {
- .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
- INPUT_DEVICE_ID_MATCH_ABSBIT,
- .evbit = { BIT_MASK(EV_ABS) },
- .absbit = { [BIT_WORD(ABS_MT_POSITION_X)] =
- BIT_MASK(ABS_MT_POSITION_X) |
- BIT_MASK(ABS_MT_POSITION_Y) },
- }, /* multi-touch touchscreen */
- {
- .flags = INPUT_DEVICE_ID_MATCH_KEYBIT |
- INPUT_DEVICE_ID_MATCH_ABSBIT,
- .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
- .absbit = { [BIT_WORD(ABS_X)] =
- BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
- }, /* touchpad */
- { },
-};
-
-static struct input_handler cpufreq_interactive_input_handler = {
- .event = cpufreq_interactive_input_event,
- .connect = cpufreq_interactive_input_connect,
- .disconnect = cpufreq_interactive_input_disconnect,
- .name = "cpufreq_interactive",
- .id_table = cpufreq_interactive_ids,
-};
-
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 timer_rate_attr = __ATTR(timer_rate, 0644,
show_timer_rate, store_timer_rate);
-static ssize_t show_input_boost(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", input_boost_val);
-}
-
-static ssize_t store_input_boost(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;
- input_boost_val = val;
- return count;
-}
-
-define_one_global_rw(input_boost);
-
static ssize_t show_boost(struct kobject *kobj, struct attribute *attr,
char *buf)
{
&above_hispeed_delay.attr,
&min_sample_time_attr.attr,
&timer_rate_attr.attr,
- &input_boost.attr,
&boost.attr,
&boostpulse.attr,
NULL,
freq_table =
cpufreq_frequency_get_table(policy->cpu);
+ if (!hispeed_freq)
+ hispeed_freq = policy->max;
for_each_cpu(j, policy->cpus) {
pcpu = &per_cpu(cpuinfo, j);
pcpu->target_set_time;
pcpu->governor_enabled = 1;
smp_wmb();
+ pcpu->cpu_timer.expires =
+ jiffies + usecs_to_jiffies(timer_rate);
+ add_timer_on(&pcpu->cpu_timer, j);
}
- if (!hispeed_freq)
- hispeed_freq = policy->max;
-
/*
* Do not register the idle hook and create sysfs
* entries if we have already done so.
if (rc)
return rc;
- rc = input_register_handler(&cpufreq_interactive_input_handler);
- if (rc)
- pr_warn("%s: failed to register input handler\n",
- __func__);
-
idle_notifier_register(&cpufreq_interactive_idle_nb);
break;
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;
}
- flush_work(&freq_scale_down_work);
if (atomic_dec_return(&active_count) > 0)
return 0;
idle_notifier_unregister(&cpufreq_interactive_idle_nb);
- input_unregister_handler(&cpufreq_interactive_input_handler);
sysfs_remove_group(cpufreq_global_kobject,
&interactive_attr_group);
pcpu->cpu_timer.data = i;
}
- spin_lock_init(&up_cpumask_lock);
- spin_lock_init(&down_cpumask_lock);
- mutex_init(&set_speed_lock);
-
- 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(&speedchange_cpumask_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);
-
- if (!down_wq)
- goto err_freeuptask;
-
- INIT_WORK(&freq_scale_down_work, cpufreq_interactive_freq_down);
- INIT_WORK(&inputopen.inputopen_work, cpufreq_interactive_input_open);
+ sched_setscheduler_nocheck(speedchange_task, SCHED_FIFO, ¶m);
+ get_task_struct(speedchange_task);
/* NB: wake up so the thread does not look hung to the freezer */
- wake_up_process(up_task);
+ 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