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Commit a7a30265 authored by Archana Sathyakumar's avatar Archana Sathyakumar
Browse files

msm-core: Provide information about throttling condition 



Prevent scheduler from scheduling tasks on a cpu that is nearing
throttling condition. Add a flag that provides this information to the
scheduler.

Change-Id: Iec0956a0bd65d72251d2377794a6f27a9d46003f
Signed-off-by: default avatarArchana Sathyakumar <asathyak@codeaurora.org>
parent 6721e9e5

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

+4 −0
Original line number Diff line number Diff line
@@ -27,6 +27,10 @@ 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

+11 −0
Original line number Diff line number Diff line
@@ -116,6 +116,10 @@ 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

 */
@@ -183,6 +187,8 @@ 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];
@@ -492,6 +498,8 @@ 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].len = cpu_node->sp->num_of_freqs;

	pstate = devm_kzalloc(dev,
@@ -919,6 +927,9 @@ 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 = msm_core_freq_init();

	if (ret)

		return ret;

include/linux/cpu.h

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ struct cpu_pstate_pwr { 
struct cpu_pwr_stats {

	int cpu;

	long temp;

	bool throttling;

	struct cpu_pstate_pwr *ptable;

	int len;

};