blob: ea70c1c32d940165940bcdc3fa2ac7a0ec346970 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*/
#include "msm_gpu.h"
#include "msm_gpu_trace.h"
#include <linux/devfreq.h>
#include <linux/devfreq_cooling.h>
#include <linux/math64.h>
#include <linux/units.h>
/*
* Power Management:
*/
static int msm_devfreq_target(struct device *dev, unsigned long *freq,
u32 flags)
{
struct msm_gpu *gpu = dev_to_gpu(dev);
struct msm_gpu_devfreq *df = &gpu->devfreq;
struct dev_pm_opp *opp;
/*
* Note that devfreq_recommended_opp() can modify the freq
* to something that actually is in the opp table:
*/
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp))
return PTR_ERR(opp);
trace_msm_gpu_freq_change(dev_pm_opp_get_freq(opp));
/*
* If the GPU is idle, devfreq is not aware, so just stash
* the new target freq (to use when we return to active)
*/
if (df->idle_freq) {
df->idle_freq = *freq;
dev_pm_opp_put(opp);
return 0;
}
if (gpu->funcs->gpu_set_freq) {
mutex_lock(&df->lock);
gpu->funcs->gpu_set_freq(gpu, opp, df->suspended);
mutex_unlock(&df->lock);
} else {
dev_pm_opp_set_rate(dev, *freq);
}
dev_pm_opp_put(opp);
return 0;
}
static unsigned long get_freq(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
/*
* If the GPU is idle, use the shadow/saved freq to avoid
* confusing devfreq (which is unaware that we are switching
* to lowest freq until the device is active again)
*/
if (df->idle_freq)
return df->idle_freq;
if (gpu->funcs->gpu_get_freq)
return gpu->funcs->gpu_get_freq(gpu);
return clk_get_rate(gpu->core_clk);
}
static int msm_devfreq_get_dev_status(struct device *dev,
struct devfreq_dev_status *status)
{
struct msm_gpu *gpu = dev_to_gpu(dev);
struct msm_gpu_devfreq *df = &gpu->devfreq;
u64 busy_cycles, busy_time;
unsigned long sample_rate;
ktime_t time;
mutex_lock(&df->lock);
status->current_frequency = get_freq(gpu);
time = ktime_get();
status->total_time = ktime_us_delta(time, df->time);
df->time = time;
if (df->suspended) {
mutex_unlock(&df->lock);
status->busy_time = 0;
return 0;
}
busy_cycles = gpu->funcs->gpu_busy(gpu, &sample_rate);
busy_time = busy_cycles - df->busy_cycles;
df->busy_cycles = busy_cycles;
mutex_unlock(&df->lock);
busy_time *= USEC_PER_SEC;
busy_time = div64_ul(busy_time, sample_rate);
if (WARN_ON(busy_time > ~0LU))
busy_time = ~0LU;
status->busy_time = busy_time;
return 0;
}
static int msm_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
{
*freq = get_freq(dev_to_gpu(dev));
return 0;
}
static struct devfreq_dev_profile msm_devfreq_profile = {
.timer = DEVFREQ_TIMER_DELAYED,
.polling_ms = 50,
.target = msm_devfreq_target,
.get_dev_status = msm_devfreq_get_dev_status,
.get_cur_freq = msm_devfreq_get_cur_freq,
};
static void msm_devfreq_boost_work(struct kthread_work *work);
static void msm_devfreq_idle_work(struct kthread_work *work);
static bool has_devfreq(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
return !!df->devfreq;
}
void msm_devfreq_init(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
struct msm_drm_private *priv = gpu->dev->dev_private;
/* We need target support to do devfreq */
if (!gpu->funcs->gpu_busy)
return;
/*
* Setup default values for simple_ondemand governor tuning. We
* want to throttle up at 50% load for the double-buffer case,
* where due to stalling waiting for vblank we could get stuck
* at (for ex) 30fps at 50% utilization.
*/
priv->gpu_devfreq_config.upthreshold = 50;
priv->gpu_devfreq_config.downdifferential = 10;
mutex_init(&df->lock);
dev_pm_qos_add_request(&gpu->pdev->dev, &df->boost_freq,
DEV_PM_QOS_MIN_FREQUENCY, 0);
msm_devfreq_profile.initial_freq = gpu->fast_rate;
/*
* Don't set the freq_table or max_state and let devfreq build the table
* from OPP
* After a deferred probe, these may have be left to non-zero values,
* so set them back to zero before creating the devfreq device
*/
msm_devfreq_profile.freq_table = NULL;
msm_devfreq_profile.max_state = 0;
df->devfreq = devm_devfreq_add_device(&gpu->pdev->dev,
&msm_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
&priv->gpu_devfreq_config);
if (IS_ERR(df->devfreq)) {
DRM_DEV_ERROR(&gpu->pdev->dev, "Couldn't initialize GPU devfreq\n");
dev_pm_qos_remove_request(&df->boost_freq);
df->devfreq = NULL;
return;
}
devfreq_suspend_device(df->devfreq);
gpu->cooling = of_devfreq_cooling_register(gpu->pdev->dev.of_node, df->devfreq);
if (IS_ERR(gpu->cooling)) {
DRM_DEV_ERROR(&gpu->pdev->dev,
"Couldn't register GPU cooling device\n");
gpu->cooling = NULL;
}
msm_hrtimer_work_init(&df->boost_work, gpu->worker, msm_devfreq_boost_work,
CLOCK_MONOTONIC, HRTIMER_MODE_REL);
msm_hrtimer_work_init(&df->idle_work, gpu->worker, msm_devfreq_idle_work,
CLOCK_MONOTONIC, HRTIMER_MODE_REL);
}
static void cancel_idle_work(struct msm_gpu_devfreq *df)
{
hrtimer_cancel(&df->idle_work.timer);
kthread_cancel_work_sync(&df->idle_work.work);
}
static void cancel_boost_work(struct msm_gpu_devfreq *df)
{
hrtimer_cancel(&df->boost_work.timer);
kthread_cancel_work_sync(&df->boost_work.work);
}
void msm_devfreq_cleanup(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
if (!has_devfreq(gpu))
return;
devfreq_cooling_unregister(gpu->cooling);
dev_pm_qos_remove_request(&df->boost_freq);
}
void msm_devfreq_resume(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
unsigned long sample_rate;
if (!has_devfreq(gpu))
return;
mutex_lock(&df->lock);
df->busy_cycles = gpu->funcs->gpu_busy(gpu, &sample_rate);
df->time = ktime_get();
df->suspended = false;
mutex_unlock(&df->lock);
devfreq_resume_device(df->devfreq);
}
void msm_devfreq_suspend(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
if (!has_devfreq(gpu))
return;
mutex_lock(&df->lock);
df->suspended = true;
mutex_unlock(&df->lock);
devfreq_suspend_device(df->devfreq);
cancel_idle_work(df);
cancel_boost_work(df);
}
static void msm_devfreq_boost_work(struct kthread_work *work)
{
struct msm_gpu_devfreq *df = container_of(work,
struct msm_gpu_devfreq, boost_work.work);
dev_pm_qos_update_request(&df->boost_freq, 0);
}
void msm_devfreq_boost(struct msm_gpu *gpu, unsigned factor)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
uint64_t freq;
if (!has_devfreq(gpu))
return;
freq = get_freq(gpu);
freq *= factor;
/*
* A nice little trap is that PM QoS operates in terms of KHz,
* while devfreq operates in terms of Hz:
*/
do_div(freq, HZ_PER_KHZ);
dev_pm_qos_update_request(&df->boost_freq, freq);
msm_hrtimer_queue_work(&df->boost_work,
ms_to_ktime(msm_devfreq_profile.polling_ms),
HRTIMER_MODE_REL);
}
void msm_devfreq_active(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
unsigned int idle_time;
unsigned long target_freq;
if (!has_devfreq(gpu))
return;
/*
* Cancel any pending transition to idle frequency:
*/
cancel_idle_work(df);
/*
* Hold devfreq lock to synchronize with get_dev_status()/
* target() callbacks
*/
mutex_lock(&df->devfreq->lock);
target_freq = df->idle_freq;
idle_time = ktime_to_ms(ktime_sub(ktime_get(), df->idle_time));
df->idle_freq = 0;
/*
* We could have become active again before the idle work had a
* chance to run, in which case the df->idle_freq would have
* still been zero. In this case, no need to change freq.
*/
if (target_freq)
msm_devfreq_target(&gpu->pdev->dev, &target_freq, 0);
mutex_unlock(&df->devfreq->lock);
/*
* If we've been idle for a significant fraction of a polling
* interval, then we won't meet the threshold of busyness for
* the governor to ramp up the freq.. so give some boost
*/
if (idle_time > msm_devfreq_profile.polling_ms) {
msm_devfreq_boost(gpu, 2);
}
}
static void msm_devfreq_idle_work(struct kthread_work *work)
{
struct msm_gpu_devfreq *df = container_of(work,
struct msm_gpu_devfreq, idle_work.work);
struct msm_gpu *gpu = container_of(df, struct msm_gpu, devfreq);
struct msm_drm_private *priv = gpu->dev->dev_private;
unsigned long idle_freq, target_freq = 0;
/*
* Hold devfreq lock to synchronize with get_dev_status()/
* target() callbacks
*/
mutex_lock(&df->devfreq->lock);
idle_freq = get_freq(gpu);
if (priv->gpu_clamp_to_idle)
msm_devfreq_target(&gpu->pdev->dev, &target_freq, 0);
df->idle_time = ktime_get();
df->idle_freq = idle_freq;
mutex_unlock(&df->devfreq->lock);
}
void msm_devfreq_idle(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
if (!has_devfreq(gpu))
return;
msm_hrtimer_queue_work(&df->idle_work, ms_to_ktime(1),
HRTIMER_MODE_REL);
}