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/*
*
* (C) COPYRIGHT 2010-2016 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.c
* Base kernel power management APIs
*/
#include <mali_kbase.h>
#include <mali_midg_regmap.h>
#include <mali_kbase_vinstr.h>
#include <mali_kbase_pm.h>
int kbase_pm_powerup(struct kbase_device *kbdev, unsigned int flags)
{
return kbase_hwaccess_pm_powerup(kbdev, flags);
}
void kbase_pm_halt(struct kbase_device *kbdev)
{
kbase_hwaccess_pm_halt(kbdev);
}
void kbase_pm_context_active(struct kbase_device *kbdev)
{
(void)kbase_pm_context_active_handle_suspend(kbdev, KBASE_PM_SUSPEND_HANDLER_NOT_POSSIBLE);
}
int kbase_pm_context_active_handle_suspend(struct kbase_device *kbdev, enum kbase_pm_suspend_handler suspend_handler)
{
struct kbasep_js_device_data *js_devdata = &kbdev->js_data;
int c;
int old_count;
KBASE_DEBUG_ASSERT(kbdev != NULL);
/* Trace timeline information about how long it took to handle the decision
* to powerup. Sometimes the event might be missed due to reading the count
* outside of mutex, but this is necessary to get the trace timing
* correct. */
old_count = kbdev->pm.active_count;
if (old_count == 0)
kbase_timeline_pm_send_event(kbdev, KBASE_TIMELINE_PM_EVENT_GPU_ACTIVE);
mutex_lock(&js_devdata->runpool_mutex);
mutex_lock(&kbdev->pm.lock);
if (kbase_pm_is_suspending(kbdev)) {
switch (suspend_handler) {
case KBASE_PM_SUSPEND_HANDLER_DONT_REACTIVATE:
if (kbdev->pm.active_count != 0)
break;
/* FALLTHROUGH */
case KBASE_PM_SUSPEND_HANDLER_DONT_INCREASE:
mutex_unlock(&kbdev->pm.lock);
mutex_unlock(&js_devdata->runpool_mutex);
if (old_count == 0)
kbase_timeline_pm_handle_event(kbdev, KBASE_TIMELINE_PM_EVENT_GPU_ACTIVE);
return 1;
case KBASE_PM_SUSPEND_HANDLER_NOT_POSSIBLE:
/* FALLTHROUGH */
default:
KBASE_DEBUG_ASSERT_MSG(false, "unreachable");
break;
}
}
c = ++kbdev->pm.active_count;
KBASE_TIMELINE_CONTEXT_ACTIVE(kbdev, c);
KBASE_TRACE_ADD_REFCOUNT(kbdev, PM_CONTEXT_ACTIVE, NULL, NULL, 0u, c);
/* Trace the event being handled */
if (old_count == 0)
kbase_timeline_pm_handle_event(kbdev, KBASE_TIMELINE_PM_EVENT_GPU_ACTIVE);
if (c == 1)
/* First context active: Power on the GPU and any cores requested by
* the policy */
kbase_hwaccess_pm_gpu_active(kbdev);
mutex_unlock(&kbdev->pm.lock);
mutex_unlock(&js_devdata->runpool_mutex);
return 0;
}
KBASE_EXPORT_TEST_API(kbase_pm_context_active);
void kbase_pm_context_idle(struct kbase_device *kbdev)
{
struct kbasep_js_device_data *js_devdata = &kbdev->js_data;
int c;
int old_count;
KBASE_DEBUG_ASSERT(kbdev != NULL);
/* Trace timeline information about how long it took to handle the decision
* to powerdown. Sometimes the event might be missed due to reading the
* count outside of mutex, but this is necessary to get the trace timing
* correct. */
old_count = kbdev->pm.active_count;
if (old_count == 0)
kbase_timeline_pm_send_event(kbdev, KBASE_TIMELINE_PM_EVENT_GPU_IDLE);
mutex_lock(&js_devdata->runpool_mutex);
mutex_lock(&kbdev->pm.lock);
c = --kbdev->pm.active_count;
KBASE_TIMELINE_CONTEXT_ACTIVE(kbdev, c);
KBASE_TRACE_ADD_REFCOUNT(kbdev, PM_CONTEXT_IDLE, NULL, NULL, 0u, c);
KBASE_DEBUG_ASSERT(c >= 0);
/* Trace the event being handled */
if (old_count == 0)
kbase_timeline_pm_handle_event(kbdev, KBASE_TIMELINE_PM_EVENT_GPU_IDLE);
if (c == 0) {
/* Last context has gone idle */
kbase_hwaccess_pm_gpu_idle(kbdev);
/* Wake up anyone waiting for this to become 0 (e.g. suspend). The
* waiters must synchronize with us by locking the pm.lock after
* waiting */
wake_up(&kbdev->pm.zero_active_count_wait);
}
mutex_unlock(&kbdev->pm.lock);
mutex_unlock(&js_devdata->runpool_mutex);
}
KBASE_EXPORT_TEST_API(kbase_pm_context_idle);
void kbase_pm_suspend(struct kbase_device *kbdev)
{
KBASE_DEBUG_ASSERT(kbdev);
/* Suspend vinstr.
* This call will block until vinstr is suspended. */
kbase_vinstr_suspend(kbdev->vinstr_ctx);
mutex_lock(&kbdev->pm.lock);
KBASE_DEBUG_ASSERT(!kbase_pm_is_suspending(kbdev));
kbdev->pm.suspending = true;
mutex_unlock(&kbdev->pm.lock);
/* From now on, the active count will drop towards zero. Sometimes, it'll
* go up briefly before going down again. However, once it reaches zero it
* will stay there - guaranteeing that we've idled all pm references */
/* Suspend job scheduler and associated components, so that it releases all
* the PM active count references */
kbasep_js_suspend(kbdev);
/* Wait for the active count to reach zero. This is not the same as
* waiting for a power down, since not all policies power down when this
* reaches zero. */
wait_event(kbdev->pm.zero_active_count_wait, kbdev->pm.active_count == 0);
/* NOTE: We synchronize with anything that was just finishing a
* kbase_pm_context_idle() call by locking the pm.lock below */
kbase_hwaccess_pm_suspend(kbdev);
}
void kbase_pm_resume(struct kbase_device *kbdev)
{
/* MUST happen before any pm_context_active calls occur */
kbase_hwaccess_pm_resume(kbdev);
/* Initial active call, to power on the GPU/cores if needed */
kbase_pm_context_active(kbdev);
/* Resume any blocked atoms (which may cause contexts to be scheduled in
* and dependent atoms to run) */
kbase_resume_suspended_soft_jobs(kbdev);
/* Resume the Job Scheduler and associated components, and start running
* atoms */
kbasep_js_resume(kbdev);
/* Matching idle call, to power off the GPU/cores if we didn't actually
* need it and the policy doesn't want it on */
kbase_pm_context_idle(kbdev);
/* Resume vinstr operation */
kbase_vinstr_resume(kbdev->vinstr_ctx);
}
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