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/*
*
* (C) COPYRIGHT 2017 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
*
*/
/*
* A core availability policy implementing core mask selection from devfreq OPPs
*
*/
#include <mali_kbase.h>
#include <mali_kbase_pm.h>
#include <backend/gpu/mali_kbase_pm_internal.h>
#include <linux/version.h>
void kbase_devfreq_set_core_mask(struct kbase_device *kbdev, u64 core_mask)
{
struct kbasep_pm_ca_policy_devfreq *data =
&kbdev->pm.backend.ca_policy_data.devfreq;
unsigned long flags;
spin_lock_irqsave(&kbdev->hwaccess_lock, flags);
data->cores_desired = core_mask;
/* Disable any cores that are now unwanted */
data->cores_enabled &= data->cores_desired;
kbdev->pm.backend.ca_in_transition = true;
/* If there are no cores to be powered off then power on desired cores
*/
if (!(data->cores_used & ~data->cores_desired)) {
data->cores_enabled = data->cores_desired;
kbdev->pm.backend.ca_in_transition = false;
}
kbase_pm_update_cores_state_nolock(kbdev);
spin_unlock_irqrestore(&kbdev->hwaccess_lock, flags);
dev_dbg(kbdev->dev, "Devfreq policy : new core mask=%llX %llX\n",
data->cores_desired, data->cores_enabled);
}
static void devfreq_init(struct kbase_device *kbdev)
{
struct kbasep_pm_ca_policy_devfreq *data =
&kbdev->pm.backend.ca_policy_data.devfreq;
if (kbdev->current_core_mask) {
data->cores_enabled = kbdev->current_core_mask;
data->cores_desired = kbdev->current_core_mask;
} else {
data->cores_enabled =
kbdev->gpu_props.props.raw_props.shader_present;
data->cores_desired =
kbdev->gpu_props.props.raw_props.shader_present;
}
data->cores_used = 0;
kbdev->pm.backend.ca_in_transition = false;
}
static void devfreq_term(struct kbase_device *kbdev)
{
}
static u64 devfreq_get_core_mask(struct kbase_device *kbdev)
{
return kbdev->pm.backend.ca_policy_data.devfreq.cores_enabled;
}
static void devfreq_update_core_status(struct kbase_device *kbdev,
u64 cores_ready,
u64 cores_transitioning)
{
struct kbasep_pm_ca_policy_devfreq *data =
&kbdev->pm.backend.ca_policy_data.devfreq;
lockdep_assert_held(&kbdev->hwaccess_lock);
data->cores_used = cores_ready | cores_transitioning;
/* If in desired state then clear transition flag */
if (data->cores_enabled == data->cores_desired)
kbdev->pm.backend.ca_in_transition = false;
/* If all undesired cores are now off then power on desired cores.
* The direct comparison against cores_enabled limits potential
* recursion to one level */
if (!(data->cores_used & ~data->cores_desired) &&
data->cores_enabled != data->cores_desired) {
data->cores_enabled = data->cores_desired;
kbase_pm_update_cores_state_nolock(kbdev);
kbdev->pm.backend.ca_in_transition = false;
}
}
/*
* The struct kbase_pm_ca_policy structure for the devfreq core availability
* policy.
*
* This is the static structure that defines the devfreq core availability power
* policy's callback and name.
*/
const struct kbase_pm_ca_policy kbase_pm_ca_devfreq_policy_ops = {
"devfreq", /* name */
devfreq_init, /* init */
devfreq_term, /* term */
devfreq_get_core_mask, /* get_core_mask */
devfreq_update_core_status, /* update_core_status */
0u, /* flags */
KBASE_PM_CA_POLICY_ID_DEVFREQ, /* id */
};
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