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/*
*
* (C) COPYRIGHT ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* @file mali_kbase_pm_metrics.c
* Metrics for power management
*/
#include <mali_kbase.h>
#include <mali_kbase_pm.h>
/* When VSync is being hit aim for utilisation between 70-90% */
#define KBASE_PM_VSYNC_MIN_UTILISATION 70
#define KBASE_PM_VSYNC_MAX_UTILISATION 90
/* Otherwise aim for 10-40% */
#define KBASE_PM_NO_VSYNC_MIN_UTILISATION 10
#define KBASE_PM_NO_VSYNC_MAX_UTILISATION 40
/* Shift used for kbasep_pm_metrics_data.time_busy/idle - units of (1 << 8) ns
This gives a maximum period between samples of 2^(32+8)/100 ns = slightly under 11s.
Exceeding this will cause overflow */
#define KBASE_PM_TIME_SHIFT 8
static enum hrtimer_restart dvfs_callback(struct hrtimer *timer)
{
unsigned long flags;
kbase_pm_dvfs_action action;
kbasep_pm_metrics_data *metrics;
KBASE_DEBUG_ASSERT(timer != NULL);
metrics = container_of(timer, kbasep_pm_metrics_data, timer);
action = kbase_pm_get_dvfs_action(metrics->kbdev);
spin_lock_irqsave(&metrics->lock, flags);
if (metrics->timer_active)
hrtimer_start(timer,
HR_TIMER_DELAY_MSEC(metrics->kbdev->pm.platform_dvfs_frequency),
HRTIMER_MODE_REL);
spin_unlock_irqrestore(&metrics->lock, flags);
return HRTIMER_NORESTART;
}
mali_error kbasep_pm_metrics_init(kbase_device *kbdev)
{
KBASE_DEBUG_ASSERT(kbdev != NULL);
kbdev->pm.metrics.kbdev = kbdev;
kbdev->pm.metrics.vsync_hit = 0;
kbdev->pm.metrics.utilisation = 0;
kbdev->pm.metrics.time_period_start = ktime_get();
kbdev->pm.metrics.time_busy = 0;
kbdev->pm.metrics.time_idle = 0;
kbdev->pm.metrics.gpu_active = MALI_TRUE;
kbdev->pm.metrics.timer_active = MALI_TRUE;
spin_lock_init(&kbdev->pm.metrics.lock);
hrtimer_init(&kbdev->pm.metrics.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
kbdev->pm.metrics.timer.function = dvfs_callback;
hrtimer_start(&kbdev->pm.metrics.timer, HR_TIMER_DELAY_MSEC(kbdev->pm.platform_dvfs_frequency), HRTIMER_MODE_REL);
kbase_pm_register_vsync_callback(kbdev);
return MALI_ERROR_NONE;
}
KBASE_EXPORT_TEST_API(kbasep_pm_metrics_init)
void kbasep_pm_metrics_term(kbase_device *kbdev)
{
unsigned long flags;
KBASE_DEBUG_ASSERT(kbdev != NULL);
spin_lock_irqsave(&kbdev->pm.metrics.lock, flags);
kbdev->pm.metrics.timer_active = MALI_FALSE;
spin_unlock_irqrestore(&kbdev->pm.metrics.lock, flags);
hrtimer_cancel(&kbdev->pm.metrics.timer);
kbase_pm_unregister_vsync_callback(kbdev);
}
KBASE_EXPORT_TEST_API(kbasep_pm_metrics_term)
void kbasep_pm_record_gpu_idle(kbase_device *kbdev)
{
unsigned long flags;
ktime_t now;
ktime_t diff;
KBASE_DEBUG_ASSERT(kbdev != NULL);
spin_lock_irqsave(&kbdev->pm.metrics.lock, flags);
KBASE_DEBUG_ASSERT(kbdev->pm.metrics.gpu_active == MALI_TRUE);
kbdev->pm.metrics.gpu_active = MALI_FALSE;
now = ktime_get();
diff = ktime_sub(now, kbdev->pm.metrics.time_period_start);
kbdev->pm.metrics.time_busy += (u32) (ktime_to_ns(diff) >> KBASE_PM_TIME_SHIFT);
kbdev->pm.metrics.time_period_start = now;
spin_unlock_irqrestore(&kbdev->pm.metrics.lock, flags);
}
KBASE_EXPORT_TEST_API(kbasep_pm_record_gpu_idle)
void kbasep_pm_record_gpu_active(kbase_device *kbdev)
{
unsigned long flags;
ktime_t now;
ktime_t diff;
KBASE_DEBUG_ASSERT(kbdev != NULL);
spin_lock_irqsave(&kbdev->pm.metrics.lock, flags);
KBASE_DEBUG_ASSERT(kbdev->pm.metrics.gpu_active == MALI_FALSE);
kbdev->pm.metrics.gpu_active = MALI_TRUE;
now = ktime_get();
diff = ktime_sub(now, kbdev->pm.metrics.time_period_start);
kbdev->pm.metrics.time_idle += (u32) (ktime_to_ns(diff) >> KBASE_PM_TIME_SHIFT);
kbdev->pm.metrics.time_period_start = now;
spin_unlock_irqrestore(&kbdev->pm.metrics.lock, flags);
}
KBASE_EXPORT_TEST_API(kbasep_pm_record_gpu_active)
void kbase_pm_report_vsync(kbase_device *kbdev, int buffer_updated)
{
unsigned long flags;
KBASE_DEBUG_ASSERT(kbdev != NULL);
spin_lock_irqsave(&kbdev->pm.metrics.lock, flags);
kbdev->pm.metrics.vsync_hit = buffer_updated;
spin_unlock_irqrestore(&kbdev->pm.metrics.lock, flags);
}
KBASE_EXPORT_TEST_API(kbase_pm_report_vsync)
/*caller needs to hold kbdev->pm.metrics.lock before calling this function*/
int kbase_pm_get_dvfs_utilisation(kbase_device *kbdev)
{
int utilisation = 0;
ktime_t now = ktime_get();
ktime_t diff;
KBASE_DEBUG_ASSERT(kbdev != NULL);
diff = ktime_sub(now, kbdev->pm.metrics.time_period_start);
if (kbdev->pm.metrics.gpu_active) {
kbdev->pm.metrics.time_busy += (u32) (ktime_to_ns(diff) >> KBASE_PM_TIME_SHIFT);
kbdev->pm.metrics.time_period_start = now;
} else {
kbdev->pm.metrics.time_idle += (u32) (ktime_to_ns(diff) >> KBASE_PM_TIME_SHIFT);
kbdev->pm.metrics.time_period_start = now;
}
if (kbdev->pm.metrics.time_idle + kbdev->pm.metrics.time_busy == 0) {
/* No data - so we return NOP */
utilisation = -1;
goto out;
}
utilisation = (100 * kbdev->pm.metrics.time_busy) / (kbdev->pm.metrics.time_idle + kbdev->pm.metrics.time_busy);
out:
kbdev->pm.metrics.time_idle = 0;
kbdev->pm.metrics.time_busy = 0;
return utilisation;
}
kbase_pm_dvfs_action kbase_pm_get_dvfs_action(kbase_device *kbdev)
{
unsigned long flags;
int utilisation;
kbase_pm_dvfs_action action;
KBASE_DEBUG_ASSERT(kbdev != NULL);
spin_lock_irqsave(&kbdev->pm.metrics.lock, flags);
utilisation = kbase_pm_get_dvfs_utilisation(kbdev);
if (utilisation < 0) {
action = KBASE_PM_DVFS_NOP;
utilisation = 0;
goto out;
}
if (kbdev->pm.metrics.vsync_hit) {
/* VSync is being met */
if (utilisation < KBASE_PM_VSYNC_MIN_UTILISATION)
action = KBASE_PM_DVFS_CLOCK_DOWN;
else if (utilisation > KBASE_PM_VSYNC_MAX_UTILISATION)
action = KBASE_PM_DVFS_CLOCK_UP;
else
action = KBASE_PM_DVFS_NOP;
} else {
/* VSync is being missed */
if (utilisation < KBASE_PM_NO_VSYNC_MIN_UTILISATION)
action = KBASE_PM_DVFS_CLOCK_DOWN;
else if (utilisation > KBASE_PM_NO_VSYNC_MAX_UTILISATION)
action = KBASE_PM_DVFS_CLOCK_UP;
else
action = KBASE_PM_DVFS_NOP;
}
kbdev->pm.metrics.utilisation = utilisation;
out:
#ifdef CONFIG_MALI_MIDGARD_DVFS
kbase_platform_dvfs_event(kbdev, utilisation);
#endif /*CONFIG_MALI_MIDGARD_DVFS */
kbdev->pm.metrics.time_idle = 0;
kbdev->pm.metrics.time_busy = 0;
spin_unlock_irqrestore(&kbdev->pm.metrics.lock, flags);
return action;
}
KBASE_EXPORT_TEST_API(kbase_pm_get_dvfs_action)
mali_bool kbase_pm_metrics_is_active(kbase_device *kbdev)
{
mali_bool isactive;
unsigned long flags;
KBASE_DEBUG_ASSERT(kbdev != NULL);
spin_lock_irqsave(&kbdev->pm.metrics.lock, flags);
isactive = (kbdev->pm.metrics.timer_active == MALI_TRUE);
spin_unlock_irqrestore(&kbdev->pm.metrics.lock, flags);
return isactive;
}
KBASE_EXPORT_TEST_API(kbase_pm_metrics_is_active)
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