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Commit e604b3e5 authored by Mahesh Sivasubramanian's avatar Mahesh Sivasubramanian
Browse files

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



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: default avatarMahesh Sivasubramanian <msivasub@codeaurora.org>
parent 794f7ffe

Documentation/devicetree/bindings/arm/msm/msm_core.txt

+0 −4
Original line number Diff line number Diff line
@@ -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:

drivers/power/qcom/msm-core.c

+16 −10
Original line number Diff line number Diff line
@@ -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)

include/soc/qcom/msm-core.h

0 → 100644
+22 −0
Original line number Diff line number Diff line 
/*

 * 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