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msm-core: Add API to throttle a CPU from thermal framework

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Scheduler should try not to assign tasks to a CPU which is thermally
mitigated. To notify scheduler of thermal mitigation, the thermal module
would notify the msm-core of a mitigation request. The information is
passed to the scheduler using existing API to publish energy numbers to the
scheduler.

Change-Id: Ic29bd89f61275680bba1b2fc6b39fff9f5cfefc8
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
This commit is contained in:
Mahesh Sivasubramanian 2014-12-03 14:08:50 -07:00
parent 794f7ffe42
commit e604b3e5c8
3 changed files with 38 additions and 14 deletions
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4
Documentation/devicetree/bindings/arm/msm/msm_core.txt
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@ -28,10 +28,6 @@ Optional properties:
is no change in threshold. If this property is not
present, the power is recalculated only on
temperature threshold notifications.
-qcom,throttling-temp: Temperature threshold for cpu frequency mitigation.
The value should be set same as the threshold temperature
in thermal module - 5 C, such that there is a bandwidth to
control the cores before frequency mitigation happens.
[Second level nodes]
Required properties to define per core characteristics:

26
drivers/power/qcom/msm-core.c
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@ -98,6 +98,7 @@ struct cpu_static_info {
static DEFINE_MUTEX(policy_update_mutex);
static DEFINE_MUTEX(kthread_update_mutex);
static DEFINE_SPINLOCK(update_lock);
static struct delayed_work sampling_work;
static struct completion sampling_completion;
static struct task_struct *sampling_task;
@ -118,9 +119,6 @@ module_param_named(disabled, disabled, int,
S_IRUGO | S_IWUSR | S_IWGRP);
static bool in_suspend;
static bool activate_power_table;
static int max_throttling_temp = 80; /* in C */
module_param_named(throttling_temp, max_throttling_temp, int,
S_IRUGO | S_IWUSR | S_IWGRP);
/*
* Cannot be called from an interrupt context
@ -195,8 +193,6 @@ static void repopulate_stats(int cpu)
temp_point = (cpu_node->temp - TEMP_BASE_POINT) / 5;
cpu_stats[cpu].temp = cpu_node->temp;
cpu_stats[cpu].throttling = cpu_node->temp >= max_throttling_temp ?
true : false;
for (i = 0; i < cpu_node->sp->num_of_freqs; i++)
pt[i].power = cpu_node->sp->power[temp_point][i];
@ -208,7 +204,6 @@ void trigger_cpu_pwr_stats_calc(void)
{
int cpu;
static long prev_temp[NR_CPUS];
static DEFINE_SPINLOCK(update_lock);
struct cpu_activity_info *cpu_node;
if (disabled)
@ -232,6 +227,20 @@ void trigger_cpu_pwr_stats_calc(void)
}
EXPORT_SYMBOL(trigger_cpu_pwr_stats_calc);
void set_cpu_throttled(cpumask_t *mask, bool throttling)
{
int cpu;
if (!mask)
return;
spin_lock(&update_lock);
for_each_cpu(cpu, mask)
cpu_stats[cpu].throttling = throttling;
spin_unlock(&update_lock);
}
EXPORT_SYMBOL(set_cpu_throttled);
static void update_related_freq_table(struct cpufreq_policy *policy)
{
int cpu, num_of_freqs;
@ -508,8 +517,7 @@ static int msm_core_stats_init(struct device *dev, int cpu)
cpu_node = &activity[cpu];
cpu_stats[cpu].cpu = cpu;
cpu_stats[cpu].temp = cpu_node->temp;
cpu_stats[cpu].throttling = cpu_node->temp >= max_throttling_temp ?
true : false;
cpu_stats[cpu].throttling = false;
cpu_stats[cpu].len = cpu_node->sp->num_of_freqs;
pstate = devm_kzalloc(dev,
@ -980,8 +988,6 @@ static int msm_core_dev_probe(struct platform_device *pdev)
if (ret)
pr_info("msm-core initialized without polling period\n");
key = "qcom,throttling-temp";
ret = of_property_read_u32(node, key, &max_throttling_temp);
ret = uio_init(pdev);
if (ret)

22
include/soc/qcom/msm-core.h Normal file
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@ -0,0 +1,22 @@
/*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
#ifndef __ARCH_ARM_MACH_MSM_CORE_H
#define __ARCH_ARM_MACH_MSM_CORE_H
#ifdef CONFIG_APSS_CORE_EA
void set_cpu_throttled(struct cpumask *mask, bool throttling);
#else
static inline void set_cpu_throttled(struct cpumask *mask, bool throttling) {}
#endif
#endif