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Commit dfbc6bef authored by Praveen Chidambaram's avatar Praveen Chidambaram Committed by Mahesh Sivasubramanian
Browse files

msm: lpm_levels: Allow enable/disable LPM for cpus and clusters 



Add sysfs interface to allow/disallow low power modes. Every level
specified in the Devicetree for each cpu and cluster will have an
idle_enabled and suspend_enabled option that controls the availability of
the low power mode for CPUIdle and HOTPLUG/Suspend frameworks.

Change-Id: Ic27f3a586eb9992c611411d2a13365b909ae48a3
Signed-off-by: default avatarPraveen Chidambaram <pchidamb@codeaurora.org>
parent e7c6d026

drivers/cpuidle/lpm-levels-of.c

+233 −1
Original line number Diff line number Diff line
@@ -15,12 +15,245 @@ 
#include <linux/slab.h>

#include <linux/of.h>

#include <linux/err.h>

#include <linux/sysfs.h>

#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/moduleparam.h>

#include "lpm-levels.h"



enum lpm_type {

	IDLE = 0,

	SUSPEND,

	LPM_TYPE_NR

};



struct lpm_type_str {

	enum lpm_type type;

	char *str;

};



static const struct lpm_type_str lpm_types[] = {

	{IDLE, "idle_enabled"},

	{SUSPEND, "suspend_enabled"},

};



static struct lpm_level_avail *cpu_level_available[NR_CPUS];

static struct platform_device *lpm_pdev;



static void *get_avail_val(struct kobject *kobj, struct kobj_attribute *attr)

{

	void *arg = NULL;

	struct lpm_level_avail *avail = NULL;



	if (!strcmp(attr->attr.name, lpm_types[IDLE].str)) {

		avail = container_of(attr, struct lpm_level_avail,

					idle_enabled_attr);

		arg = (void *) &avail->idle_enabled;

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

		avail = container_of(attr, struct lpm_level_avail,

					suspend_enabled_attr);

		arg = (void *) &avail->suspend_enabled;

	}



	return arg;

}



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

				char *buf)

{

	int ret = 0;

	struct kernel_param kp;



	kp.arg = get_avail_val(kobj, attr);

	ret = param_get_bool(buf, &kp);

	if (ret > 0) {

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

		ret++;

	}



	return ret;

}



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

				const char *buf, size_t len)

{

	int ret = 0;

	struct kernel_param kp;



	kp.arg = get_avail_val(kobj, attr);

	ret = param_set_bool(buf, &kp);



	return ret ? ret : len;

}



static int create_lvl_avail_nodes(const char *name,

			struct kobject *parent, struct lpm_level_avail *avail)

{

	struct attribute_group *attr_group = NULL;

	struct attribute **attr = NULL;

	struct kobject *kobj = NULL;

	int ret = 0;



	kobj = kobject_create_and_add(name, parent);

	if (!kobj)

		return -ENOMEM;



	attr_group = devm_kzalloc(&lpm_pdev->dev, sizeof(*attr_group),

					GFP_KERNEL);

	if (!attr_group) {

		ret = -ENOMEM;

		goto failed;

	}



	attr = devm_kzalloc(&lpm_pdev->dev,

		sizeof(*attr) * (LPM_TYPE_NR + 1), GFP_KERNEL);

	if (!attr) {

		ret = -ENOMEM;

		goto failed;

	}



	avail->idle_enabled_attr.attr.name = lpm_types[IDLE].str;

	avail->idle_enabled_attr.attr.mode = 0644;

	avail->idle_enabled_attr.show = lpm_enable_show;

	avail->idle_enabled_attr.store = lpm_enable_store;



	avail->suspend_enabled_attr.attr.name = lpm_types[SUSPEND].str;

	avail->suspend_enabled_attr.attr.mode = 0644;

	avail->suspend_enabled_attr.show = lpm_enable_show;

	avail->suspend_enabled_attr.store = lpm_enable_store;



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

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

	attr[2] = NULL;

	attr_group->attrs = attr;



	ret = sysfs_create_group(kobj, attr_group);

	if (ret) {

		ret = -ENOMEM;

		goto failed;

	}



	avail->idle_enabled = true;

	avail->suspend_enabled = true;

	avail->kobj = kobj;



	return ret;



failed:

	kobject_put(kobj);

	return ret;

}



static int create_cpu_lvl_nodes(struct lpm_cluster *p, struct kobject *parent)

{

	int cpu;

	int i, j;

	struct kobject **cpu_kobj = NULL;

	struct lpm_level_avail *level_list = NULL;

	char cpu_name[20] = {0};

	int ret = 0;



	cpu_kobj = devm_kzalloc(&lpm_pdev->dev, sizeof(*cpu_kobj) *

			cpumask_weight(&p->child_cpus), GFP_KERNEL);

	if (!cpu_kobj)

		return -ENOMEM;



	for_each_cpu(cpu, &p->child_cpus) {

		snprintf(cpu_name, sizeof(cpu_name), "cpu%d", cpu);

		cpu_kobj[cpu] = kobject_create_and_add(cpu_name, parent);

		if (!cpu_kobj[cpu])

			return -ENOMEM;



		level_list = devm_kzalloc(&lpm_pdev->dev,

				MSM_PM_SLEEP_MODE_NR * sizeof(*level_list),

				GFP_KERNEL);

		if (!level_list)

			return -ENOMEM;



		for (i = 0; i < MSM_PM_SLEEP_MODE_NR; i++) {

			for (j = 0; j < p->cpu->nlevels; j++)

				if (p->cpu->levels[j].mode == i)

					break;

			if (j == p->cpu->nlevels) {

				/* Level not defined in DT */

				level_list[i].idle_enabled = false;

				level_list[i].suspend_enabled = false;

				continue;

			}



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

						cpu_kobj[cpu], &level_list[i]);

			if (ret)

				return ret;

		}



		cpu_level_available[cpu] = level_list;

	}



	return 0;



}



int create_cluster_lvl_nodes(struct lpm_cluster *p, struct kobject *kobj)

{

	int ret = 0;

	struct lpm_cluster *child = NULL;

	int i;

	struct kobject *cluster_kobj = NULL;



	if (!p)

		return -ENODEV;



	cluster_kobj = kobject_create_and_add(p->cluster_name, kobj);

	if (!cluster_kobj)

		return -ENOMEM;



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

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

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

		if (ret)

			return ret;

	}



	list_for_each_entry(child, &p->child, list) {

		ret = create_cluster_lvl_nodes(child, cluster_kobj);

		if (ret)

			return ret;

	}



	if (p->cpu) {

		ret = create_cpu_lvl_nodes(p, cluster_kobj);

		if (ret)

			return ret;

	}



	return 0;

}



bool lpm_cpu_mode_allow(unsigned int cpu,

		unsigned int mode, bool from_idle)

{

	struct lpm_level_avail *avail = cpu_level_available[cpu];



	if (!lpm_pdev || !avail)

		return !from_idle;



	return !!(from_idle ? avail[mode].idle_enabled :

				avail[mode].suspend_enabled);

}



bool lpm_cluster_mode_allow(struct lpm_cluster *cluster,

		unsigned int mode, bool from_idle)

{

	struct lpm_level_avail *avail = &cluster->levels[mode].available;



	if (!lpm_pdev || !avail)

		return false;



	return !!(from_idle ? avail->idle_enabled :

				avail->suspend_enabled);

}



static int parse_cluster_params(struct device_node *node, struct lpm_cluster *c)

{

	int i;
@@ -194,7 +427,6 @@ static int parse_cluster_level(struct device_node *node, 
			cluster->min_child_level = level->min_child_level;

	}



	level->available = true;

	level->notify_rpm = of_property_read_bool(node, "qcom,notify-rpm");

	level->last_core_only = of_property_read_bool(node,

					"qcom,last-core-only");

drivers/cpuidle/lpm-levels.c

+24 −6
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/msm_remote_spinlock.h>

#include <linux/dma-mapping.h>

#include <linux/coresight-cti.h>

#include <linux/moduleparam.h>

#include <soc/qcom/spm.h>

#include <soc/qcom/pm.h>

#include <soc/qcom/rpm-notifier.h>
@@ -68,7 +69,8 @@ struct lpm_debug { 
	uint32_t arg4;

};



static struct lpm_cluster *lpm_root_node;

struct lpm_cluster *lpm_root_node;



static DEFINE_PER_CPU(struct lpm_cluster*, cpu_cluster);

static bool suspend_in_progress;

static struct hrtimer lpm_hrtimer;
@@ -253,7 +255,7 @@ static int cpu_power_select(struct cpuidle_device *dev, 
		enum msm_pm_sleep_mode mode = level->mode;

		bool allow;



		allow = msm_pm_sleep_mode_allow(dev->cpu, mode, true);

		allow = lpm_cpu_mode_allow(dev->cpu, mode, true);



		if (!allow)

			continue;
@@ -374,7 +376,7 @@ static int cluster_select(struct lpm_cluster *cluster, bool from_idle) 
		struct lpm_cluster_level *level = &cluster->levels[i];

		struct power_params *pwr_params = &level->pwr;



		if (!level->available)

		if (!lpm_cluster_mode_allow(cluster, i, from_idle))

			continue;



		if (level->last_core_only &&
@@ -801,7 +803,7 @@ static int lpm_suspend_enter(suspend_state_t state) 
	for (idx = lpm_cpu->nlevels - 1; idx >= 0; idx--) {

		struct lpm_cpu_level *level = &lpm_cpu->levels[idx];



		if (msm_pm_sleep_mode_allow(cpu, level->mode, false))

		if (lpm_cpu_mode_allow(cpu, level->mode, false))

			break;

	}

	if (idx < 0) {
@@ -829,6 +831,7 @@ static int lpm_probe(struct platform_device *pdev) 
	int size;

	struct lpm_cluster *p = NULL;

	int cpu;

	struct kobject *module_kobj = NULL;



	lpm_root_node = lpm_of_parse_cluster(pdev);
@@ -884,6 +887,21 @@ static int lpm_probe(struct platform_device *pdev) 
		goto failed;

	}



	module_kobj = kset_find_obj(module_kset, KBUILD_MODNAME);

	if (!module_kobj) {

		pr_err("%s: cannot find kobject for module %s\n",

			__func__, KBUILD_MODNAME);

		ret = -ENOENT;

		goto failed;

	}



	ret = create_cluster_lvl_nodes(lpm_root_node, module_kobj);

	if (ret) {

		pr_err("%s(): Failed to create cluster level nodes\n",

				__func__);

		goto failed;

	}



	return 0;

failed:

	free_cluster_node(lpm_root_node);
@@ -972,10 +990,10 @@ void lpm_cpu_hotplug_enter(unsigned int cpu) 
	int i;

	int idx = -1;



	if (msm_pm_sleep_mode_allow(cpu, MSM_PM_SLEEP_MODE_POWER_COLLAPSE,

	if (lpm_cpu_mode_allow(cpu, MSM_PM_SLEEP_MODE_POWER_COLLAPSE,

				false))

		mode = MSM_PM_SLEEP_MODE_POWER_COLLAPSE;

	else if (msm_pm_sleep_mode_allow(cpu,

	else if (lpm_cpu_mode_allow(cpu,

			MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE, false))

		mode = MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE;

	else

drivers/cpuidle/lpm-levels.h

+17 −1
Original line number Diff line number Diff line
@@ -40,6 +40,14 @@ struct lpm_cpu { 
	struct lpm_cluster *parent;

};



struct lpm_level_avail {

	bool idle_enabled;

	bool suspend_enabled;

	struct kobject *kobj;

	struct kobj_attribute idle_enabled_attr;

	struct kobj_attribute suspend_enabled_attr;

};



struct lpm_cluster_level {

	const char *level_name;

	int *mode;			/* SPM mode to enter */
@@ -47,9 +55,9 @@ struct lpm_cluster_level { 
	struct cpumask num_cpu_votes;

	struct power_params pwr;

	bool notify_rpm;

	bool available;

	bool sync_level;

	bool last_core_only;

	struct lpm_level_avail available;

};



struct low_power_ops {
@@ -87,3 +95,11 @@ int set_cci_mode(struct low_power_ops *ops, int mode, bool notify_rpm); 
struct lpm_cluster *lpm_of_parse_cluster(struct platform_device *pdev);

void free_cluster_node(struct lpm_cluster *cluster);

void cluster_dt_walkthrough(struct lpm_cluster *cluster);



int create_cluster_lvl_nodes(struct lpm_cluster *p, struct kobject *kobj);

bool lpm_cpu_mode_allow(unsigned int cpu,

		unsigned int mode, bool from_idle);

bool lpm_cluster_mode_allow(struct lpm_cluster *cluster,

		unsigned int mode, bool from_idle);



extern struct lpm_cluster *lpm_root_node;

drivers/power/qcom/msm-pm.c

+0 −1
Original line number Diff line number Diff line
@@ -839,7 +839,6 @@ static int msm_cpu_pm_probe(struct platform_device *pdev) 
		}

	}



	msm_pm_mode_sysfs_add(KBUILD_MODNAME);

	if (pdev->dev.of_node)

		of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

include/soc/qcom/pm.h

+0 −2
Original line number Diff line number Diff line
@@ -61,8 +61,6 @@ struct msm_pm_sleep_status_data { 
	uint32_t mask;

};



int msm_pm_mode_sysfs_add(const char *);



/**

 * lpm_cpu_pre_pc_cb(): API to get the L2 flag to pass to TZ

 *