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// SPDX-License-Identifier: GPL-2.0
/*
*
* (C) COPYRIGHT 2012-2016, 2018-2020 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
* SPDX-License-Identifier: GPL-2.0
*
*/
/*
* "Adaptive" power management policy
*
* Copyright 2021 Google LLC
*
* Author: Sidath Senanayake <sidaths@google.com>
*/
#include <mali_kbase.h>
#include <mali_kbase_config_defaults.h>
#include <mali_kbase_pm.h>
/* The number of times the adaptive power off hysteresis timer can fire without
* an intervening GPU active period before power off hysteresis is set to 0.
*/
#ifndef DEFAULT_PM_ADAPTIVE_HYSTERESIS
#define DEFAULT_PM_ADAPTIVE_HYSTERESIS (2)
#endif
static bool adaptive_shaders_needed(struct kbase_device *kbdev)
{
return kbase_pm_is_active(kbdev);
}
static bool adaptive_get_core_active(struct kbase_device *kbdev)
{
return kbase_pm_is_active(kbdev);
}
static void adaptive_init(struct kbase_device *kbdev)
{
struct kbasep_pm_tick_timer_state *stt = &kbdev->pm.backend.shader_tick_timer;
struct kbasep_pm_policy_adaptive *data = &kbdev->pm.backend.pm_policy_data.adaptive;
stt->configured_ticks = stt->default_ticks;
data->delay = DEFAULT_PM_ADAPTIVE_HYSTERESIS;
}
static void adaptive_term(struct kbase_device *kbdev)
{
struct kbasep_pm_tick_timer_state *stt = &kbdev->pm.backend.shader_tick_timer;
stt->configured_ticks = stt->default_ticks;
}
static void adaptive_handle_event(struct kbase_device *kbdev, enum kbase_pm_policy_event event)
{
u64 threshold;
struct kbasep_pm_tick_timer_state *stt = &kbdev->pm.backend.shader_tick_timer;
struct kbasep_pm_policy_adaptive *data = &kbdev->pm.backend.pm_policy_data.adaptive;
switch (event)
{
case KBASE_PM_POLICY_EVENT_IDLE:
data->last_idle = ktime_get_ns();
break;
case KBASE_PM_POLICY_EVENT_POWER_ON:
threshold = stt->default_ticks * ktime_to_ns(stt->configured_interval);
if (ktime_get_ns() - data->last_idle < threshold)
stt->configured_ticks = stt->default_ticks;
break;
case KBASE_PM_POLICY_EVENT_TIMER_HIT:
data->delay = DEFAULT_PM_ADAPTIVE_HYSTERESIS;
break;
case KBASE_PM_POLICY_EVENT_TIMER_MISS:
if (data->delay-- == 0) {
stt->configured_ticks = 0;
data->delay = DEFAULT_PM_ADAPTIVE_HYSTERESIS;
}
break;
}
}
/* The struct kbase_pm_policy structure for the adaptive power policy.
*
* This is the static structure that defines the adaptive power policy's callback
* and name.
*/
const struct kbase_pm_policy kbase_pm_adaptive_policy_ops = {
"adaptive", /* name */
adaptive_init, /* init */
adaptive_term, /* term */
adaptive_shaders_needed, /* shaders_needed */
adaptive_get_core_active, /* get_core_active */
adaptive_handle_event, /* handle_event */
KBASE_PM_POLICY_ID_ADAPTIVE, /* id */
#if MALI_USE_CSF
ADAPTIVE_PM_SCHED_FLAGS, /* pm_sched_flags */
#endif
};
KBASE_EXPORT_TEST_API(kbase_pm_adaptive_policy_ops);
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