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Commit 62b3a6be authored by Mahesh Sivasubramanian's avatar Mahesh Sivasubramanian
Browse files

drivers: cpuidle: lpm-levels: Add support to export latency via sysfs 



Add support to export latency of the low power mode via sysfs. This
allows users to query the latency of CPUSS low power modes and vote
against certain low power modes based on the needs of the usecase.

Change-Id: I19c06b42860c30478f070cc4126f1e7180c342d4
Signed-off-by: default avatarMahesh Sivasubramanian <msivasub@codeaurora.org>
parent 684a7b03

drivers/cpuidle/lpm-levels-of.c

+37 −1
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ bool use_psci; 
enum lpm_type {

	IDLE = 0,

	SUSPEND,

	LATENCY,

	LPM_TYPE_NR

};
@@ -36,6 +37,7 @@ struct lpm_type_str { 
static const struct lpm_type_str lpm_types[] = {

	{IDLE, "idle_enabled"},

	{SUSPEND, "suspend_enabled"},

	{LATENCY, "latency_us"},

};



static DEFINE_PER_CPU(uint32_t *, max_residency);
@@ -67,6 +69,9 @@ static struct lpm_level_avail *get_avail_ptr(struct kobject *kobj, 
	else if (!strcmp(attr->attr.name, lpm_types[SUSPEND].str))

		avail = container_of(attr, struct lpm_level_avail,

					suspend_enabled_attr);

	else if (!strcmp(attr->attr.name, lpm_types[LATENCY].str))

		avail = container_of(attr, struct lpm_level_avail,

					latency_attr);



	return avail;

}
@@ -163,6 +168,28 @@ uint32_t *get_per_cpu_min_residency(int cpu) 
{

	return per_cpu(min_residency, cpu);

}



static ssize_t lpm_latency_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	int ret = 0;

	struct kernel_param kp;

	struct lpm_level_avail *avail = get_avail_ptr(kobj, attr);



	if (!avail)

		pr_info("Error\n");



	kp.arg = &avail->latency_us;



	ret = param_get_uint(buf, &kp);

	if (ret > 0) {

		strlcat(buf, "\n", PAGE_SIZE);

		ret++;

	}



	return ret;

}



ssize_t lpm_enable_show(struct kobject *kobj, struct kobj_attribute *attr,

				char *buf)

{
@@ -239,9 +266,16 @@ static int create_lvl_avail_nodes(const char *name, 
	avail->suspend_enabled_attr.show = lpm_enable_show;

	avail->suspend_enabled_attr.store = lpm_enable_store;



	sysfs_attr_init(&avail->latency_attr.attr);

	avail->latency_attr.attr.name = lpm_types[LATENCY].str;

	avail->latency_attr.attr.mode = 0444;

	avail->latency_attr.show = lpm_latency_show;

	avail->latency_attr.store = NULL;



	attr[0] = &avail->idle_enabled_attr.attr;

	attr[1] = &avail->suspend_enabled_attr.attr;

	attr[2] = NULL;

	attr[2] = &avail->latency_attr.attr;

	attr[3] = NULL;

	attr_group->attrs = attr;



	ret = sysfs_create_group(kobj, attr_group);
@@ -301,6 +335,7 @@ static int create_cpu_lvl_nodes(struct lpm_cluster *p, struct kobject *parent) 
		 */

		for (i = 1; i < p->cpu->nlevels; i++) {



			level_list[i].latency_us = p->levels[i].pwr.latency_us;

			ret = create_lvl_avail_nodes(p->cpu->levels[i].name,

					cpu_kobj[cpu_idx], &level_list[i],

					(void *)p->cpu, cpu, true);
@@ -336,6 +371,7 @@ int create_cluster_lvl_nodes(struct lpm_cluster *p, struct kobject *kobj) 
		return -ENOMEM;



	for (i = 0; i < p->nlevels; i++) {

		p->levels[i].available.latency_us = p->levels[i].pwr.latency_us;

		ret = create_lvl_avail_nodes(p->levels[i].level_name,

				cluster_kobj, &p->levels[i].available,

				(void *)p, 0, false);

drivers/cpuidle/lpm-levels.h

+3 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.

/* Copyright (c) 2014-2017, 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
@@ -57,9 +57,11 @@ struct lpm_cpu { 
struct lpm_level_avail {

	bool idle_enabled;

	bool suspend_enabled;

	uint32_t latency_us;

	struct kobject *kobj;

	struct kobj_attribute idle_enabled_attr;

	struct kobj_attribute suspend_enabled_attr;

	struct kobj_attribute latency_attr;

	void *data;

	int idx;

	bool cpu_node;