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/*
* Copyright (C) 2010-2011 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.
*/
#include <linux/devfreq.h>
#include <linux/platform_device.h>
#include "mali_kernel_devfreq.h"
#include "mali_osk.h"
#include "mali_platform.h"
#include "mali_linux_pm.h"
#define MALI_GPU_UTILIZATION_PERIOD 500
static _mali_osk_lock_t *time_data_lock;
static _mali_osk_atomic_t num_running_cores;
static u64 period_start_time = 0;
static u64 work_start_time = 0;
static u64 accumulated_work_time = 0;
static mali_bool timer_running = MALI_FALSE;
static struct devfreq *mali_devfreq;
static int mali_get_dev_status(struct device *dev,
struct devfreq_dev_status *stat)
{
u64 time_now;
u64 time_period;
_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
if (accumulated_work_time == 0 && work_start_time == 0)
{
/* No work done for this period, report zero usage */
stat->total_time = 0;
stat->busy_time = 0;
stat->current_frequency = get_mali_platform_cur_freq();
_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
return 0;
}
time_now = _mali_osk_time_get_ns();
time_period = time_now - period_start_time;
/* If we are currently busy, update working period up to now */
if (work_start_time != 0)
{
accumulated_work_time += (time_now - work_start_time);
work_start_time = time_now;
}
stat->total_time = time_period;
stat->busy_time = accumulated_work_time;
stat->current_frequency = get_mali_platform_cur_freq();
accumulated_work_time = 0;
/* start a new period */
period_start_time = time_now;
_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
return 0;
}
static int mali_set_target_freq(struct device *dev,
unsigned long *freq,
u32 flags)
{
mali_gpu_utilization_handler(*freq);
return 0;
}
static int mali_get_cur_freq(struct device *dev, unsigned long *freq)
{
*freq = get_mali_platform_cur_freq();
return 0;
}
static struct devfreq_dev_profile mali_devfreq_profile = {
.polling_ms = MALI_GPU_UTILIZATION_PERIOD,
.initial_freq = 0,
.target = mali_set_target_freq,
.get_dev_status = mali_get_dev_status,
.get_cur_freq = mali_get_cur_freq,
};
_mali_osk_errcode_t mali_utilization_init(void)
{
/* Register mali devfreq with ondemand governor */
mali_devfreq = devfreq_add_device(&mali_gpu_device.dev,
&mali_devfreq_profile,
&devfreq_simple_ondemand,
NULL);
if (NULL == mali_devfreq)
{
return _MALI_OSK_ERR_FAULT;
}
time_data_lock = _mali_osk_lock_init( 0, 0, 0 );
if (NULL == time_data_lock)
{
return _MALI_OSK_ERR_FAULT;
}
_mali_osk_atomic_init(&num_running_cores, 0);
return _MALI_OSK_ERR_OK;
}
void mali_utilization_suspend(void)
{
if (timer_running == MALI_TRUE)
{
devfreq_suspend_device(mali_devfreq);
_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
timer_running = MALI_FALSE;
work_start_time = 0;
period_start_time = 0;
accumulated_work_time = 0;
_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
}
}
void mali_utilization_resume(void)
{
devfreq_resume_device(mali_devfreq);
}
void mali_utilization_term(void)
{
devfreq_remove_device(mali_devfreq);
mali_devfreq = NULL;
timer_running = MALI_FALSE;
_mali_osk_atomic_term(&num_running_cores);
_mali_osk_lock_term(time_data_lock);
}
void mali_utilization_core_start(void)
{
if (_mali_osk_atomic_inc_return(&num_running_cores) == 1)
{
/*
* We went from zero cores working, to one core working,
* we now consider the entire GPU for being busy
*/
_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
work_start_time = _mali_osk_time_get_ns();
if (timer_running != MALI_TRUE)
{
timer_running = MALI_TRUE;
period_start_time = work_start_time;
}
_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
}
}
void mali_utilization_core_end(void)
{
if (_mali_osk_atomic_dec_return(&num_running_cores) == 0)
{
/*
* No more cores are working, so accumulate the time we was busy.
*/
u64 time_now;
_mali_osk_lock_wait(time_data_lock, _MALI_OSK_LOCKMODE_RW);
time_now = _mali_osk_time_get_ns();
accumulated_work_time += (time_now - work_start_time);
work_start_time = 0;
_mali_osk_lock_signal(time_data_lock, _MALI_OSK_LOCKMODE_RW);
}
}
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